lt 1637

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The LT1637 is a rugged op amp that operates on all singleand split supplies with a total voltage of 2.7V to 44V. TheLT1637 has a gain-bandwidth product of 1.1MHz whiledrawing less than 250A of quiescent current. The LT1637can be shut down, making the output high impedance andreducing the quiescent current to only 3A. The LT1637 isreverse supply protected: it draws virtually no current for re-verse supply up to 25V. The input range of the LT1637 in-cludes both supplies and the output swings to both supplies.Unlike most micropower op amps, the LT1637 can driveheavy loads; its rail-to-rail output drives 25mA. The LT1637is unity-gain stable into all capacitive loads up to 4700pFwhen optional 0.22F and 150compensation is used.

The LT1637 has a unique input stage that operates andremains high impedance when above the positive supply.The inputs take 44V both differential and common mode,even when operating on a 3V supply. Built-in resistorsprotect the inputs for faults below the negative supply upto 22V. There is no phase reversal of the output for inputs5V below VEEor 44V above VEE, independent of VCC.

The LT1637 op amp is available in the 8-pin MSOP, PDIPand SO packages. For space limited applications, theLT1637 is available in a 3mm 3mm 0.8mm dual finepitch leadless package (DFN).

Battery or Solar Powered Systems:

Portable InstrumentationSensor Conditioning

Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters

Operates with Inputs Above V +

Rail-to-Rail Input and Output Micropower: 250A Supply Current Max Operating Temperature Range: 55C to 125C Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/s Low Input Offset Voltage: 350V Max Single Supply Input Range: 0.4V to 44V High Output Current: 25mA Min Specified on 3V, 5V and 15V Supplies Output Shutdown Output Drives 4700pF with Output Compensation Reverse Battery Protection to 25V High Voltage Gain: 800V/mV High CMRR: 110dB Available in 8-Lead MSOP, PDIP and SO Packages;

and a Tiny (3mm 3mm 0.8mm) DFN Package

Over-The-TopCurrent Source with Shutdown

SHDN

IOUT

LT1004-1.24.7F

2k

*OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R

R

4V TO 44V

TP0610

1637 TA01

R*

+

LT1637

IOUT=

e.g., 10mA = 120

1.2R

+VSHDN

6V

4V

2V

0V

10mA

5mA

0mA

IOUT

100s/DIV

Switchable Precision Current Source Current Source Timing

APPLICATIO SU

TYPICAL APPLICATIO U

1.1MHz, 0.4V/sOver-The-Top Micropower, Rail-To-Rail

Input and Output Op Amp

FEATURES DESCRIPTIO U

1637 TA01b

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.Over-The-Top is a registered trademark of Linear Technology Corporation.All other trademarks are the property of their respective owners.

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ORDER PARTNUMBER

Total Supply Voltage (V +to V ) .............................. 44VInput Differential Voltage ......................................... 44VInput Current ...................................................... 25mA

Shutdown Pin Voltage Above V .....................................32VShutdown Pin Current ........................................ 10mAOutput Short-Circuit Duration (Note 2) .........ContinuousOperating Temperature Range (Note 3)

LT1637C/LT1637I .............................. 40C to 85CLT1637H .......................................... 40C to 125CLT1637MP......................................... 55C to 125C

*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.

(Note 1)

ORDER PARTNUMBER

S8 PARTMARKING

16371637I1637H1637MP

LT1637CN8LT1637CS8LT1637IN8LT1637IS8LT1637HS8LT1637MPS8

1

2

3

4

8

7

6

5

TOP VIEW

NULL

V+

OUT

SHDN

NULL

IN

+IN

V

S8 PACKAGE8-LEAD PLASTIC SO

N8 PACKAGE8-LEAD PDIP

TJMAX= 150C, JA= 150C/W (N8)TJMAX= 150C, JA= 190C/W (S8)

PACKAGE/ORDER I FOR ATIOU UW

ABSOLUTE AXI U RATI GSW WW U

Specified Temperature Range (Note 4)LT1637C/LT1637I .............................. 40C to 85CLT1637H .......................................... 40C to 125C

LT1637MP......................................... 55C to 125CJunction Temperature ........................................... 150CJunction Temperature (DD Package) ................... 125CStorage Temperature Range ................. 65C to 150CStorage Temperature Range(DD Package) ....................................... 65C to 125CLead Temperature (Soldering, 10 sec) .................. 300C

1234

NULLIN+INV

8765

NULLV+

OUTSHDN

TOP VIEW

MS8 PACKAGE8-LEAD PLASTIC MSOP

MS8 PART*MARKING

LTIELTIELT1637CMS8LT1637IMS8

TJMAX= 150C, JA= 250C/W

ORDER PARTNUMBER

DD PART*MARKING

LAAKLAAKLT1637CDDLT1637IDD

TOP VIEW

DD PACKAGE8-LEAD (3mm 3mm) PLASTIC DFN

5

6

7

8

4

3

2

1NULL

IN A

+IN A

V

NULL

V+

OUT

SHDN

LT1637C/LT1637ISYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VOS Input Offset Voltage N8, S8 Packages 100 350 V0C TA70C 550 V40C TA85C 700 V

MS8 Package 100 350 V0C TA70C 750 V40C TA85C 1100 V

DD Package 125 550 V0C TA70C 950 V40C TA85C 1100 V

The denotes the specifications which apply over the full operating temperature range of 40C TA85C, otherwisespecifications are at TA= 25C. VS= 3V, 0V; VS= 5V, 0V; VSHDN= V

,VCM= VOUT= half supply unless otherwise specified. (Note 4)

3V 5V AU

D ELECTRICAL CHARACTERISTICS

TJMAX= 125C, JA= 160C/W (NOTE 2)

UNDERSIDE METAL CONNECTED TO V

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Input Offset Voltage Drift (Note 9) N8, S8 Packages, 40C TA85C 1 3 V/CMS8 Package, 40C TA85C 2 6 V/CDDPackage, 40C TA85C 2 6 V/C

IOS Input Offset Current 0.4 6.0 nAVCM= 44V (Note 5) 2.5 A

IB Input Bias Current 20 50 nAVCM= 44V (Note 5) 23 60 AVS= 0V 0.1 nA

Input Noise Voltage 0.1Hz to 10Hz 0.6 VP-P

en Input Noise Voltage Density f = 1kHz 27 nV/ Hz

in Input Noise Current Density f = 1kHz 0.08 pA/ Hz

RIN Input Resistance Differential 1 2.6 M

Common Mode, VCM= 0V to 44V 0.7 1.4 M

CIN Input Capacitance 4 pF

Input Voltage Range 0 44 V

CMRR Common Mode Rejection Ratio VCM= 0V to (VCC 1V) 88 110 dB(Note 5) VCM= 0V to 44V (Note 8) 80 98 dB

AVOL Large-Signal Voltage Gain VS= 3V, VO= 500mV to 2.5V, RL= 10k 150 400 V/mVVS= 3V, 0C TA70C 100 V/mVVS= 3V, 40C TA85C 75 V/mV

VS= 5V, VO= 500mV to 4.5V, RL= 10k 300 800 V/mVVS= 5V, 0C TA70C 200 V/mVVS= 5V, 40C TA85C 150 V/mV

VOL Output Voltage Swing LOW No Load 3 8 mVISINK= 5mA 325 700 mVVS= 5V, ISINK= 10mA 580 1300 mV

VOH Output Voltage Swing HIGH VS= 3V, No Load 2.94 2.975 VVS= 3V, ISOURCE= 5mA 2.25 2.67 V

VS= 5V, No Load 4.94 4.975 VVS= 5V, ISOURCE= 10mA 3.80 4.45 V

ISC Short-Circuit Current (Note 2) VS= 3V, Short Output to Ground 10 14 mAVS= 3V, Short Output to VCC 15 45 mA

VS= 5V, Short Output to Ground 15 22 mAVS= 5V, Short Output to VCC 15 60 mA

PSRR Power Supply Rejection Ratio VS= 3V to 12.5V, VCM= VO= 1V 90 98 dB

Minimum Supply Voltage 2.7 V

Reverse Supply Voltage IS= 100A 25 40 V

IS Supply Current 190 250 A(Note 6) 295 A

Supply Current, SHDN VPIN5= 2V, No Load (Note 6) 3 12 A

ISHDN Shutdown Pin Current VPIN5= 0.3V, No Load (Note 6) 0.2 15 nAVPIN5= 2V, No Load (Note 5) 1.0 5 AVPIN5= 3.3V 2.5 AVPIN5= 5V 4.3 A

Output Leakage Current, SHDN VPIN5= 2V, No Load (Note 6) 0.02 1 A

LT1637C/LT1637I

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

The denotes the specifications which apply over the full operating temperature range of 40C TA85C, otherwisespecifications are at TA= 25C. VS= 3V, 0V; VS= 5V, 0V; VSHDN= V

,VCM= VOUT= half supply unless otherwise specified. (Note 4)

3V 5V AU


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LT1637C/LT1637I

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VOS Input Offset Voltage N8, S8 Packages 100 450 V0C TA70C 650 V40C TA85C 800 V

MS8 Package 100 450 V0C TA70C 800 V40C TA85C 1150 V

DD Package 125 650 V

0C TA70C 1000 V40C TA85C 1150 V

Input Offset Voltage Drift (Note 9) N8, S8 Packages, 40C TA85C 1 3 V/CMS8 Package, 40C TA85C 2 6 V/CDD Package, 40C TA85C 2 6 V/C

IOS Input Offset Current 1 6 nA

IB Input Bias Current 17 50 nA

Input Noise Voltage 0.1Hz to 10Hz 0.6 VP-P

en Input Noise Voltage Density f = 1kHz 27 nV/ Hz

in Input Noise Current Density f = 1kHz 0.08 pA/ Hz

RIN Input Resistance Differential 1 3 M

Common Mode, VCM= 15V to 14V 2200 M

CIN Input Capacitance 4 pF

Input Voltage Range 15 29 V

CMRR Common Mode Rejection Ratio VCM= 15V to 29V 80 110 dB

AVOL Large-Signal Voltage Gain VO= 14V, RL= 10k 100 400 V/mV0C TA70C 75 V/mV40C TA85C 50 V/mV

VOL Output Voltage Swing LOW No Load 14.997 14.95 VISINK= 5mA 14.680 14.25 VISINK= 10mA 14.420 13.65 V

The denotes the specifications which apply over the full operating temperature range of 40C TA 85C, otherwisespecifications are at TA= 25C. VS= 15V, VCM= 0V, VOUT= 0V, VSHDN= V

unless otherwise specified. (Note 4)

15V ELECTRICAL CHARACTERISTICS

The denotes the specifications which apply over the full operating temperature range of 40C TA 85C, otherwisespecifications are at TA= 25C. VS= 3V, 0V; VS= 5V, 0V; VSHDN= V

, VCM= VOUT= half supply unless otherwise specified. (Note 4)

3V 5V AU



Maximum Shutdown Pin Current VPIN5= 32V, No Load (Note 5) 20 150 A

tON Turn-On Time VPIN5= 5V to 0V, RL= 10k 45 s

tOFF Turn-Off Time VPIN5= 0V to 5V, RL= 10k 3 s

tSETTLING Settling Time 0.1% AV= 1, VO= 2V 9 s

GBW Gain-Bandwidth Product f = 10kHz 650 1000 kHz(Note 5) 0C TA70C 550 kHz

40C TA85C 500 kHz

SR Slew Rate AV= 1, RL= 0.210 0.35 V/ s(Note 7) 0C TA70C 0.185 V/s

40C TA85C 0.170 V/s

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VOH Output Voltage Swing HIGH No Load 14.9 14.967 VISOURCE= 5mA 14.2 14.667 VISOURCE= 10mA 13.7 14.440 V

ISC Short-Circuit Current (Note 2) Short Output to GND 25 31.7 mA0C TA70C 20 mA40C TA85C 15 mA

PSRR Power Supply Rejection Ratio VS= 1.5V to 22V 90 115 dB


IS Supply Current 230 300 A 370 A

Positive Supply Current, SHDN VPIN5= 20V, VS= 22V, No Load 6 40 A

ISHDN Shutdown Pin Current VPIN5= 21.7V, VS= 22V, No Load 0.3 15 nAVPIN5= 20V, VS= 22V, No Load 0.9 8 A

Maximum Shutdown Pin Current VPIN5= 32V, VS= 22V 20 150 A

Output Leakage Current, SHDN VPIN5= 20V, VS= 22V, No Load 0.02 2 A

VL Shutdown Pin Input Low Voltage VS= 22V 21.7 21.6 V

VH Shutdown Pin Input High Voltage VS= 22V 20.8 20.0 V

tON Turn-On Time VPIN5= 10V to 15V, RL= 10k 35 s

tOFF Turn-Off Time VPIN5= 15V to 10V, RL= 10k 3 s

GBW Gain-Bandwidth Product f = 10kHz 750 1100 kHz0C TA70C 650 kHz40C TA85C 600 kHz

SR Slew Rate AV= 1, RL= , VO= 10V, Measure at VO= 5V 0.225 0.4 V/ s0C TA70C 0.200 V/s40C TA85C 0.180 V/s

The denotes the specifications which apply over the full operating temperature range of 40C TA 85C, otherwisespecifications are at TA= 25C. VS= 15V, VCM= 0V, VOUT= 0V, VSHDN= V

unless otherwise specified. (Note 4)



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LT1637H/LT1637MPSYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VOS Input Offset Voltage 100 450 V 3 mV

Input Offset Voltage Drift (Note 9) 3 10 V/C

IOS Input Offset Current 15 nAVCM= 44V (Note 5) 10 A

IB Input Bias Current 150 nAVCM= 44V (Note 5) 100 A

Input Voltage Range 0.3 44 V

CMRR Common Mode Rejection Ratio VCM= 0.3V to (VCC 1V) 72 dB(Note 5) VCM= 0.3V to 44V 74 dB

AVOL Large-Signal Voltage Gain VS= 3V, VO= 500mV to 2.5V, RL= 10k 150 400 V/mV

20 V/mVVS= 5V, VO= 500mV to 4.5V, RL= 10k 300 800 V/mV

35 V/mV

VOL Output Voltage Swing LOW No Load 15 mVISINK= 5mA 900 mVVS= 5V, ISINK= 10mA 1500 mV

VOH Output Voltage Swing HIGH VS= 3V, No Load 2.90 VVS= 3V, ISOURCE= 5mA 2.05 V

VS= 5V, No Load 4.90 VVS= 5V, ISOURCE= 10mA 3.50 V

PSRR Power Supply Rejection Ratio VS= 3V to 12.5V, VCM= VO= 1V 80 dB


Reverse Supply Voltage IS= 100A 23 V

IS Supply Current (Note 6) 190 250 A 400 A

Supply Current, SHDN VPIN5= 2V, No Load (Note 6) 15 A

ISHDN Shutdown Pin Current VPIN5= 0.3V, No Load (Note 6) 200 nAVPIN5= 2V, No Load (Note 5) 7 A

Output Leakage Current, SHDN VPIN5= 2V, No Load (Note 6) 5 A

Maximum Shutdown Pin Current VPIN5= 32V, No Load (Note 5) 200 A

GBW Gain-Bandwidth Product f = 10kHz (Note 5) 650 1000 kHz 350 kHz

SR Slew Rate AV= 1, RL= (Note 7) 0.210 0.35 V/ s

0.1 V/s

The denotes the specifications which apply over the full operating temperature range of 40C TA 125C for LT1637H and55C TA125C for LT1637MP. VS= 3V, 0V; VS= 5V, 0V; VCM= VOUT= half supply unless otherwise specified. (Note 4)

3V 5V AU


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The denotes the specifications which apply over the full operating temperature range of 40C TA 125C for LT1637H and55C TA125C for LT1637MP. VS= 15V, VCM= 0V, VOUT= 0V, VSHDN= V

, unless otherwise specified. (Note 4)


LT1637H/LT1637MP

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITSVOS Input Offset Voltage 100 550 V

3.4 mV

Input Offset Voltage Drift (Note 9) 3 11 V/C

IOS Input Offset Current 25 nA

IB Input Bias Current 250 nA

CMRR Common Mode Rejection Ratio VCM= 14.7V to 29V 72 dB

AVOL Large-Signal Voltage Gain VO= 14V, RL= 10k 100 400 V/mV 4 V/mV

VO Output Voltage Swing No Load 14.8 VIOUT= 5mA 14.0 VIOUT= 10mA 13.4 V

PSRR Power Supply Rejection Ratio VS= 1.5V to 22V 84 dB


IS Supply Current 230 300 A 500 A

Positive Supply Current, SHDN VPIN5= 20V, VS= 22V, No Load 60 A

ISHDN Shutdown Pin Current VPIN5= 21.7V, VS= 22V, No Load 200 nAVPIN5= 20V, VS= 22V, No Load 10 A

Maximum Shutdown Pin Current VPIN5= 32V, VS= 22V 200 A

Output Leakage Current, SHDN VPIN5= 20V, VS= 22V, No Load 100 A

VL Shutdown Pin Input Low Voltage VS= 22V 21.7 V

VH Shutdown Pin Input High Voltage VS= 22V 20 V

GBW Gain-Bandwidth Product f = 10kHz 750 1100 kHz 400 kHz

SR Slew Rate AV= 1, RL= , VO= 10V, 0.225 0.4 V/sMeasure at VO= 5V 0.1 V/s

Note 1:Stresses beyond those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. Exposure to any AbsoluteMaximum Rating condition for extended periods may affect devicereliability and lifetime.

Note 2:A heat sink may be required to keep the junction temperaturebelow absolute maximum. The JAspecified for the DD package is withminimal PCB heat spreading metal. Using expanded metal area on all layersof a board reduces this value.

Note 3:The LT1637C and LT1637I are guaranteed functional over theoperating temperature range of 40C to 85C. The LT1637H is guaranteedfunctional over the operating temperature range of 40C to 125C. TheLT1637MP is guaranteed functional over the operating temperature range55C to 125C.

Note 4:The LT1637C is guaranteed to meet specified performance from0C to 70C. The LT1637C is designed, characterized and expected to meet

specified performance from 40C to 85C but is not tested or QAsampled at these temperatures. The LT1637I is guaranteed to meetspecified performance from 40C to 85C. The LT1637H is guaranteed tomeet specified performance from 40C to 125C and the LT1637MP isguaranteed to meet specified performance from 55C to 125C.

Note 5:VS= 5V limits are guaranteed by correlation to VS= 3V andVS= 15V or VS= 22V tests.

Note 6:VS= 3V limits are guaranteed by correlation to VS= 5V and

VS= 15V or VS= 22V tests.

Note 7:Guaranteed by correlation to slew rate at VS= 15V and GBW atVS= 3V and VS= 15V tests.

Note 8:This specification implies a typical input offset voltage of 650V atVCM= 44V and a maximum input offset voltage of 5.4mV at VCM= 44V.

Note 9:This parameter is not 100% tested.

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Input Noise Current vs Frequency0.1Hz to 10Hz Noise VoltageNoise Voltage Densityvs Frequency

Output Saturation Voltagevs Load Current (Output High)

Output Saturation Voltagevs Input Overdrive

Output Saturation Voltagevs Load Current (Output Low)

SOURCING LOAD CURRENT (mA)

0.0001 0.0010.01

OUTP

UTSATURATIONVOLTAGE(V)

0.1

1

0.01 0.1 1 10 100

1637 G04

VS= 5V, 0VVOD= 30mV

TA= 25C

TA= 125C

TA= 55C

SINKING LOAD CURRENT (mA)

0.0001 0.0010.001

0.01

OUTP

UTSATURATIONVOLTAGE(V)

0.1

1

10

0.01 0.1 1 10 100

1637 G05

VS= 5V, 0VVOD= 30mV

TA= 125C

TA= 55C

TA= 25C

INPUT OVERDRIVE (mV)

0

OUTPU

TSATURATIONVOLTAGE(mV)

60

80

100

80

1637 G06

40

20

50

70

90

30

10

020 40 6010 9030 50 70 100

OUTPUT HIGH

OUTPUT LOW

VS= 5V, 0VNO LOAD

FREQUENCY (Hz)

1

INPUTNOISECURRENTDE

NSITY(pA/Hz)

1.4

1.2

1.0

0.8

0.6

0.4

0.2

010 100 1000

1637 G09

VS= 15V

FREQUENCY (Hz)

120

INPUTNOISEVOLTAGEDE

NSITY(nV/Hz)

50

60

70

10 100 1000

1637 G08

40

30

VS= 15V

TIME (s)

0

NOISEVOLTAGE(20

0nV/DIV)

8

1637 G07

2 4 61 93 5 7 10

VS= 2.5V

Supply Current vs Supply VoltageInput Bias Currentvs Common Mode VoltageMinimum Supply Voltage

TYPICAL PERFOR A CE CHARACTERISTICSUW

TOTAL SUPPLY VOLTAGE (V)

0 10 20 30 40

SUPPLYCURRENT(A)

1637 G01

400

350

300

250

200

150

100

50

0

TA= 125C

TA= 25C

TA= 55C


0 1 2 3 4 5

CHANGEININPUTOFFSETVOLTAGE(V)

1637 G02

400

300

200

100

0

100

200

300

400

TA= 125C

TA= 55C

TA= 25C

COMMON MODE VOLTAGE (V)

4 4.2 4.4 4.6 4.8 5 10 20 30 40 50

INPUTBIASCURRENT(A)

4030

20

10

0.12

0.08

0.04

0

0.04

0.08

1637 G03

VS= 5V, 0V

TA= 125C

TA= 55C

TA= 25C

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Open-Loop Gain and Phase Shiftvs Frequency Slew Rate vs Temperature

Gain-Bandwidth Productvs Temperature


FREQUENCY (Hz)

1k

10GAIN(dB)

PHASESHIFT(DEG)

20

30

40

50

10k 100k 1M

1637 G10

0

10

20

30

6070

0

20

40

60

80

100120VS= 2.5V

PHASE

GAIN

TEMPERATURE (C)

50

GAIN-B

ANDWIDTHPRODUCT(kHz)

1300

1200

1100

1000

900

800

70025 75

1637 G11

25 0 50 100 125

VS= 15V

VS= 1.5V

TEMPERATURE (C)

50

SLEW

RATE(V/s)

25

1637 G12

25 0 50 75 100 125

0.7

0.6

0.5

0.4

0.3

0.2

0.1

FALLING, VS= 1.5V

FALLING, VS= 15V

RISING, VS= 15V

RISING, VS= 1.5V

Gain-Bandwidth Product andPhase Margin vs Load Resistance

Undistorted Output Swingvs FrequencyOutput Impedance vs Frequency

Gain-Bandwidth Product andPhase Margin vs Supply Voltage CMRR vs Frequency PSRR vs Frequency


0

GAIN-BANDWIDTHPRODUCT(kHz)

PHASEMARGIN(DEG

)

10 20 25 45

1637 G13

5 15 30 35 40

1300

1250

1200

1150

1100

1050

1000

55

50

45

40

35

30

25

PHASE MARGIN

GAIN BANDWIDTH

FREQUENCY (Hz)

1k

COMMO

NMODEREJECTIONRATIO(dB)

10k 100k 1M

1637 G14

VS= 1.5V

100

90

80

70

60

50

40

30

20

10

0

VS= 15V

FREQUENCY (Hz)

1k

POWER

SUPPLYREJECTIONRATIO(dB)

10k 100k 1M

1637 G15

VS= 2.5V

90

80

70

60

50

40

30

20

10

0

10

POSITIVE SUPPLY

NEGATIVE SUPPLY

LOAD RESISTANCE ()

1k

GAIN-B

ANDWIDTHPRODUCT(kHz)

PHA

SEMARGIN(DEG)

1400

1300

1200

1100

1000

900

800

700

60010k 100k

1637 G16

50

45

40

35

30

25

20

15

10

PHASE MARGIN

GAIN BANDWIDTH

VS= 2.5V

FREQUENCY (Hz)

1000.1

OUTPUTIMPEDANCE()

10

10k

1k 100k 1M10k

1637 G17

1

100

1k

VS= 2.5V

AV= 100

AV= 10

AV= 1

FREQUENCY (Hz)

100

20

OUTPUTSWING(

VP-P

)25

30

35

1k 10k 100k

1637 G18

15

10

5

0

Vs= 15V

Vs= 2.5V

DISTORTION 1%AV= 1

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CHANGE

IN

IN

PUT

OFFSET

VOLTAGE

(

50

V/DIV)

Open-Loop Gain

0V 10V

OUTPUT VOLTAGE (5V/DIV)

C

1637 G24 1637 G25

A: RL= 2k

B: RL= 10k

C: RL= 50k

Large-Signal Response

1637 G26

Small-Signal Response

AB

10V

Total Harmonic Distortion + Noisevs Load Resistance

Total Harmonic Distortion + Noisevs Output Voltage

LOAD RESISTANCE TO GROUND ()

0.001

THD+NOISE(%)

0.01

0.1

1

1k 10k 100k

1637 G22

0.0001100

VS= 3V TOTALAV= 1VIN= 1.8VP-PAT 1kHz

VS= 3V, 0VVIN= 0.3V TO 2.1V

VS= 1.5VVIN= 0.9V

VS= 3V, 0VVIN= 0.6V TO 2.4V

OUTPUT VOLTAGE (VP-P)

0.01

THD+NOISE(%)

1

10

0 2 3

1637 G23

0.0011

0.1

RL= 10kVCM= HALF SUPPLYf = 1kHzFOR AV= 1, RG= 100k

AV= 1, VS= 3V, 0V

AV= 1VS= 1.5V

AV= 1VS= 3V, 0V

AV= 1VS= 3V, 0V

AV= 1VS= 1.5V

VS= 15VVS= 15V

AV= 1

VS= 15V

AV= 1

A

B

C

10V

10V

50mV

50mV

Settling Time to 0.1%vs Output Step

Total Harmonic Distortion + Noisevs Frequency

Capacitive Load Handling,Overshoot vs Capacitive Load


SETTLING TIME (s)

010

OUTPUTSTEP(V)

8

4

2

0

10

4

10 20

1637 G19

6

6

8

2

30 40

AV= 1

AV= 1

AV= 1

VS= 15V

AV= 1

CAPACITIVE LOAD (pF)

10

40OVERSHOOT(%)

50

60

70

80

100 1000 10000

1637 G20

30

20

10

0

90100 VS= 2.5V

NO OUTPUT COMPENSATION

AV= 1 AV= 5

AV= 2

AV= 10

FREQUENCY (Hz)

100.0001

THD+NOISE(%)

0.01

10

100 10k 100k1k

1637 G21

0.001

0.1

1

VS= 3V, 0VVOUT= 1.8VP-PVCM= 1.2VRL=10k

AV= 1

AV= 1

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LT1637

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Supply Voltage

The positive supply pin of the LT1637 should be bypassed

with a small capacitor (about 0.01F) within an inch of thepin. When driving heavy loads an additional 4.7F electro-lytic capacitor should be used. When using split supplies,the same is true for the negative supply pin.

The LT1637 is protected against reverse battery voltagesup to 25V. In the event a reverse battery condition occurs,the supply current is typically less than 1nA.

When operating the LT1637 on total supplies of 30V ormore, the supply must not be brought up faster than 1s.This is especially true if low ESR bypass capacitors are

used. A series RLC circuit is formed from the supply leadinductance and the bypass capacitor. 5of resistance inthe supply or the bypass capacitor will dampen the tunedcircuit enough to limit the rise time.

Inputs

The LT1637 has two input stages, NPN and PNP (see theSimplified Schematic), resulting in three distinct operat-ing regions as shown in the Input Bias Current vs CommonMode typical performance curve.

For input voltages about 0.9V or more below V+, the PNPinput stage is active and the input bias current is typically20nA. When the input voltage is about 0.5V or less fromV+, the NPN input stage is operating and the input biascurrent is typically 80nA. Increases in temperature willcause the voltage at which operation switches from thePNP stage to the NPN stage to move towards V +. The inputoffset voltage of the NPN stage is untrimmed and istypically 600V.

A Schottky diode in the collector of each NPN transistor ofthe NPN input stage allows the LT1637 to operate with

either or both of its inputs above V+. At about 0.3V above

V+the NPN input transistor is fully saturated and the inputbias current is typically 23A at room temperature. Theinput offset voltage is typically 600V when operatingabove V+. The LT1637 will operate with its input 44V aboveVregardless of V+.

APPLICATIO S I FOR ATIOWU UU

The inputs are protected against excursions as much as22V below V by an internal 1.3k resistor in series witheach input and a diode from the input to the negative

supply. There is no output phase reversal for inputs up to5V below V . There are no clamping diodes between theinputs and the maximum differential input voltage is 44V.

Output

The output voltage swing of the LT1637 is affected byinput overdrive as shown in the typical performancecurves. When monitoring input voltages within 100mV ofV+, gain should be taken to keep the output from clipping.

The output of the LT1637 can be pulled up to 25V beyond

V+with less than 1nA of leakage current, provided that V+is less than 0.5V.

The normally reverse biased substrate diode from theoutput to Vwill cause unlimited currents to flow when theoutput is forced below V. If the current is transient andlimited to 100mA, no damage will occur.

The LT1637 is internally compensated to drive at least200pF of capacitance under any output loading condi-tions. A 0.22F capacitor in series with a 150resistorbetween the output and ground will compensate these

amplifiers for larger capacitive loads, up to 4700pF, at alloutput currents.

Distortion

There are two main contributors of distortion in op amps:output crossover distortion as the output transitions fromsourcing to sinking current and distortion caused bynonlinear common mode rejection. Of course, if the opamp is operating inverting there is no common modeinduced distortion. When the LT1637 switches betweeninput stages there is significant nonlinearity in the CMRR.

Lower load resistance increases the output crossoverdistortion, but has no effect on the input stage transitiondistortion. For lowest distortion the LT1637 should beoperated single supply, with the output always sourcingcurrent and with the input voltage swing between groundand (V+ 0.9V). See the Typical Performance Character-istics curves.

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LT1637

1637fd

SCHE ATICWW

SI PLIFIED

7 V +

4 V

6 OUT

81 NULLNULL

1637 SS

3

5

+IN

IN

Q25

Q24

Q26

Q18

Q17

R67k

R8400

R57k

R31.3k

R41.3k

SHDN

R7400

Q16

Q15Q10

Q11

Q9

Q8

Q14Q2

D5

Q13Q1

10AQ20

Q23

D3

Q7

D1 D2

D4Q6

Q4

Q5

2

R26k

R11M

Q3

Q19

Q21

Q22

Q12

APPLICATIO S I FOR ATIOWU UU

Gain

The open-loop gain is less sensitive to load resistance

when the output is sourcing current. This optimizes per-formance in single supply applications where the load isreturned to ground. The typical performance photo ofOpen-Loop Gain for various loads shows the details.

Shutdown

The LT1637 can be shut down two ways: using theshutdown pin or bringing V+to within 0.5V of V . When V+

is brought to within 0.5V of V both the supply current andoutput leakage current drop to less than 10nA. When theshutdown pin is brought 1.2V above V , the supply

current drops to about 3A and the output leakage currentis less than 1A, independent of V+. In either case the inputbias current is less than 0.1nA (even if the inputs are 44Vabove the negative supply).

Figure 1. Input Offset Nulling

LT1637

10k

1637 F01V

1

8

The shutdown pin can be taken up to 32V above V . Theshutdown pin can be driven below V , however the pincurrent through the substrate diode should be limited with

an external resistor to less than 10mA.

Input Offset Nulling

The input offset voltage can be nulled by placing a 10kpotentiometer between Pins 1 and 8 with its wiper to V

(see Figure 1). The null range will be at least 3mV.

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TYPICAL APPLICATIO SU

+

LT1637

1637 TA03

VIN

0.22F

CL4700pF

150

Positive Supply Rail Current SenseOptional Output Compensation for

Capacitive Loads Greater Than 200pF

+

LT1637

IN1(0V TO 44V)

IN2(0V TO 44V)

2N5087

2N5210

1637 TA04

1M

VOUT

1M

VCC100

1M

10k

HYSTERESIS =

10k

1M

3V TO 44V

+

LT1637

3V TO 44V

3V

R1200

RS0.2

R2

2k

VOUT(0V TO 2.7V)

Q12N3904

1637 TA06

LOAD

ILOAD

VOUT(RS)(R2/R1)

ILOAD=

Over-The-Top Comparator with Hysteresis

Lamp Outage Detector

Over-The-Top Current Sense

+

LT1637

5k

1M5V TO 44V 3V

100k

0.5

LAMPON/OFF

OUT

1637 TA05

OUT = 0V FOR GOOD BULB3V FOR OPEN BULB

+

LT1637

5V

200

200

0.2

2k

0V TO 4.3V

1637 TA02VOUT= (2)(ILOAD)

Q12N3904

LOAD ILOAD

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LT1637

1637fd

PACKAGE DESCRIPTIO U

MS8 Package8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660)

DD Package8-Lead Plastic DFN (3mm 3mm)


3.00 0.10(4 SIDES)

NOTE:1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)2. DRAWING NOT TO SCALE3. ALL DIMENSIONS ARE IN MILLIMETERS4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE5. EXPOSED PAD SHALL BE SOLDER PLATED6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION

ON TOP AND BOTTOM OF PACKAGE

0.38 0.10

BOTTOM VIEWEXPOSED PAD

1.65 0.10(2 SIDES)

0.75 0.05

R = 0.115TYP

2.38 0.10(2 SIDES)

14

85

PIN 1TOP MARK

(NOTE 6)

0.200 REF

0.00 0.05

(DD) DFN 1203

0.25 0.05

2.38 0.05(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

1.65 0.05(2 SIDES)2.15 0.05

0.50BSC

0.675 0.05

3.5 0.05

PACKAGEOUTLINE

0.25 0.050.50 BSC

MSOP (MS8) 0204

0.53 0.152

(.021 .006)

SEATINGPLANE

NOTE:1. DIMENSIONS IN MILLIMETER/(INCH)2. DRAWING NOT TO SCALE3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

0.18(.007)

0.254

(.010)

1.10

(.043)MAX

0.22 0.38

(.009 .015)TYP

0.127 0.076

(.005 .003)

0.86

(.034)REF

0.65

(.0256)BSC

0 6TYP

DETAIL A

DETAIL A

GAUGE PLANE

1 2 3 4

4.90 0.152

(.193 .006)

8 7 6 5

3.00 0.102

(.118 .004)

(NOTE 3)

3.00 0.102

(.118 .004)

(NOTE 4)

0.52

(.0205)REF

5.23(.206)MIN

3.20 3.45(.126 .136)

0.889 0.127(.035 .005)

RECOMMENDED SOLDER PAD LAYOUT

0.42 0.038(.0165 .0015)

TYP

0.65(.0256)

BSC

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LT1637

1637fd

N8 1002

.065(1.651)

TYP

.045 .065

(1.143 1.651)

.130 .005

(3.302 0.127)

.020

(0.508)MIN.018 .003

(0.457 0.076)

.120

(3.048)MIN

1 2 3 4

8 7 6 5

.255 .015*

(6.477 0.381)

.400*(10.160)

MAX

.008 .015

(0.203 0.381)

.300 .325

(7.620 8.255)

.325+.035.015

+0.8890.381

8.255( )NOTE:

1. DIMENSIONS AREINCHES

MILLIMETERS*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

.100

(2.54)

BSC

PACKAGE DESCRIPTIO U

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

N8 Package8-Lead PDIP (Narrow .300 Inch)(Reference LTC DWG # 05-08-1510)

S8 Package8-Lead Plastic Small Outline (Narrow .150 Inch)


.016 .050

(0.406 1.270)

.010 .020

(0.254 0.508)45

0 8TYP.008 .010

(0.203 0.254)

SO8 0303

.053 .069

(1.346 1.752)

.014 .019

(0.355 0.483)TYP

.004 .010

(0.101 0.254)

.050

(1.270)BSC

1 2 3 4

.150 .157

(3.810 3.988)

NOTE 3

8 7 6 5

.189 .197

(4.801 5.004)NOTE 3

.228 .244

(5.791 6.197)

.245MIN .160 .005

RECOMMENDED SOLDER PAD LAYOUT

.045 .005.050 BSC

.030 .005TYP

INCHES

(MILLIMETERS)

NOTE:1. DIMENSIONS IN

2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

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LT1637

1637fd

Linear Technology Corporation LT 0107 REV D PRINTED IN USA

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TYPICAL APPLICATIO SU

SHDN

VIN

VOUT

3V

150

0.22F

DROOP (LT1636 BUFFER): 200mV/sDROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s

1637 TA07

+LT1637

3V

+

LT1636

3V

0V

VSAMPLE

VOUT2V/DIV

INPUTSELECT

5V/DIV

0.2ms/DIV 1637 TA08

MUX Amplifier Waveforms

Sample-and-Hold

SHDN

VIN1

5kHz AT 4VP-P

INPUT SELECT1kHz AT 5VPP

SHDN

VIN210kHz AT 2VPP

VOUT

5V

74HC04 1637 TA09

+

LT1637

5V

+

LT1637

MUX Amplifier

lt 1637

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