Micropower Rail-to-Rail Op Amp and Reference


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FEATURES DESCRIPTIO

The LT®1635 is a new analog building block that includes a rail-to-rail output op amp, a precision reference and reference buffer. The device operates from supplies as low as a single 1.2V or up to 5V, yet it consumes only 130A of supply current.

The input common mode range of the op amp includes ground and incorporates phase reversal protection to pre- vent false outputs from occurring when the input is below the negative supply. The rail-to-rail output stage can swing to within 15mV of each rail with no load and can swing to within 250mV of each rail while delivering 10mA of output current. The gain bandwidth of the op amp is 175kHz and it is unity- gain stable with up to 1000pF load capacitance.

The 0.2V reference is referred to Vand includes a buffer amplifier to enhance flexibility. The reference and buffer combine to achieve a drift of 30ppm/C, a line regulation of 20ppm/ V and a load regulation of 150ppm/mA.

The LT1635 is available in 8-pin PDIP and SO packages, and has the industry standard LM10 pinout.

, LTC and LT are registered trademarks of Linear Technology Corporation.


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TYPICAL APPLICATIO

0V to 5V Regulator Typical Distribution of Input Offset Voltage


C1 0.01F


R1 100k


25

PERCENT OF UNITS

VS = 5V, 0V








TA = 25

C


























































































VIN > 5.2V 20

15


2


3

R2 3.9k


VOUT

ADJ


7


LT1635


8

1


R3

5k


6 VOUT

4 0V TO 5V


10


5


0

– 1.0 – 0.6 – 0.2 0.2


0.6


1.0


1635 TA01

INPUT OFFSET VOLTAGE (mV)


1635 TA02


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W W

W

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V + to V) .............................. 14V

Input Differential Voltage ......................................... 14V

Input Current ...................................................... 25mA

Output Short-Circuit Duration ....................... Continuous Operating Temperature Range

(Note 2) .............................................. – 40C to 85C

Junction Temperature ........................................... 150C

Storage Temperature Range ................. – 65C to 150C

Lead Temperature (Soldering, 10 sec).................. 300C

PACKAGE/ORDER I FOR ATIO



TOP VIEW


REFOUT 1 8 REF FB OP AMP IN (–) 2 + 7 V+

OP AMP IN (+) 3 + 6 OP AMP OUT V4 5 BALANCE


N8 PACKAGE S8 PACKAGE

8-LEAD PDIP 8-LEAD PLASTIC SO

TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)

ORDER PART NUMBER

LT1635CN8 LT1635CS8 LT1635IN8 LT1635IS8

S8 PART MARKING

1635 1635I

Consult LTC Marketing for parts specified with wider operating temperature ranges.


ELECTRICAL CHARACTERISTICS

5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, 0V; VCM = VOUT = 2.5V, unless otherwise noted. (Note 2)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VOS Input Offset Voltage 0.3 1.3 mV

0C TA 70C 0.5 1.6 mV

– 40C TA 85C 1.8 mV

Input Offset Voltage Drift – 40C TA 85C (Note 4) 3.0 7.0 V/C VOS ADJ Offset Voltage Adjust Range Positive Adjust 6 8 mV

Negative Adjust – 1.4 – 2 mV

IOS Input Offset Current 0.2 0.6 nA

IB Input Bias Current 2.0 4.5 nA

AVOL Large-Signal Voltage Gain VO = 200mV to 4.5V, No Load 100 450 V/mV

VO = 200mV to 4.5V, RL = 1.1k 45 200 V/mV

VO = 200mV to 4.5V, RL = 500 35 150 V/mV

Shunt Gain IOUT = 0.1mA to 5mA V/mV

VO = 1.5V to 6.45V 15 25 V/mV

(Note 5) 8 20 V/mV

VOL Output Voltage Swing Low VS = 5V, No Load 2 10 mV

VS = 5V, ISINK = 5mA 125 250 mV

VS = 5V, ISINK = 10mA 200 500 mV

VOH Output Voltage Swing High VS = 5V, No Load 4.975 4.985 V

VS = 5V, ISOURCE = 5mA 4.65 4.8 V

VS = 5V, ISOURCE = 10mA 4.55 4.75 V


ELECTRICAL CHARACTERISTICS

5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, 0V; VCM = VOUT = 2.5V, unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ISC

Short-Circuit Current

VS = 5V, Short to GND VS = 5V, Short to VCC

20

20

40

40


mA mA

PSRR

Power Supply Rejection Ratio

VS = 1.2V to 12V, VCM = VO = 0.2V


93

90

100

97


dB dB


Minimum Operating Supply Voltage

(Note 3)


1.1

1.2

V

IS

Supply Current




130

150

200

260

A

A

GBW

Gain Bandwidth Product

f = 1kHz


175

kHz

SR

Slew Rate

AV = – 1, RL =


0.045

V/s


5V REFERENCE: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, 0V, unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VREF

Feedback Sense Voltage

Voltage at Pin 1 with Pin 1 Connected to Pin 8 (Note 6)

189

200

211

mV

TC VREF

Reference Drift

(Note 4)


30

100

ppm/C


Feedback Current

Current into Pin 8



3.5

5.0

10

15

nA nA


Line Regulation

0 IREF 1mA, VREF = 200mV VS = 1.2V to 5V

VS = 1.3V to 5V (Note 3)




20

30


100

200


ppm/V ppm/V


Load Regulation

IREF = 0 to 1mA



150

200

300

500

ppm/mA ppm/mA


Reference Amplifier Gain

VO = 0.2V to 3.5V


45

25

90

50


V/mV V/mV

5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V; VCM = VOUT = 0V, unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOS

Input Offset Voltage


0C TA 70C

– 40C TA 85C



0.3

0.5

1.5

1.9

2.1

mV mV mV


Input Offset Voltage Drift

0C TA 85C (Note 4)


4.5

10.0

V/C

VOS ADJ

Offset Voltage Adjust Range

Positive Adjust Negative Adjust

6

– 1.4

8

– 2


mV mV

IOS

Input Offset Current



0.2

0.6

nA

IB

Input Bias Current




2.0

2.5

4.5

5.5

nA nA


Input Noise Voltage

0.1Hz to 10Hz


1

VP-P

en

Input Noise Voltage Density

f = 1kHz


50

nV/Hz

in

Input Noise Current Density

f = 1kHz


0.05

pA/Hz

RIN

Input Resistance

Differential

Common Mode, VCM = – 5V to 4V

7

35

9


M G


Input Voltage Range


–5


4

V

CMRR

Common Mode Rejection Ratio

VCM = – 5V to 4V


94

91

115

110


dB dB


ELECTRICAL CHARACTERISTICS

5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V; VCM = VOUT = 0V, unless otherwise noted. (Note 2)


SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

AVOL

Large-Signal Voltage Gain

VO = – 4.5V to 4.5V, No Load VO = – 4.5V to 4.5V, RL = 1.1k

VO = – 4.5V to 4.5V, RL = 500

175

15

10

300

100

60


V/mV V/mV V/mV

VO

Output Voltage Swing

VS = 5V, No Load

VS = 5V, ISINK = 5mA

VS = 5V, ISINK = 10mA

4.975

4.65

4.5

4.985

4.75

4.6


mV mV mV

ISC

Short-Circuit Current

VS = 5V


20

40


mA

PSRR

Power Supply Rejection Ratio

VS = 1V to 6V, VCM = VO = 0V


90

88

100

98


dB dB

IS

Supply Current




135

160

215

280

A

A

GBW

Gain Bandwidth Product

f = 1kHz


175

kHz

SR

Slew Rate

AV = –1, RL =


0.05

V/s

5V REFERENCE: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VREF

Feedback Sense Voltage

Voltage at Pin 1 with Pin 1 Connected to Pin 8 (Note 6)

189

200

211

mV

TC VREF

Reference Drift

(Note 4)


40

120

ppm/C


Feedback Current

Current into Pin 8



3.5

5.0

10

15

nA nA


Line Regulation

0 IREF 1mA, VREF = 200mV

VS = 0.6V to 5V

VS = 0.65V to 5V (Note 3)




20

30


100

200


ppm/V ppm/V


Load Regulation

IREF = 0 to 1mA



150

200

300

500

ppm/mA ppm/mA


Reference Amplifier Gain

VO = 0.2V to 8.5V VS = 10V, 0V


45

25

90

50


V/mV V/mV


Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be imparied.

Note 2: The LT1635C is guaranteed to operate over the commercial temperature range of 0C to 70C. It is designed, characterized and expected to meet these extended temperature limits, but is not tested at

– 40C and 85C. The LT1635I is guaranteed to meet the industrial temperature range.

Note 3: The LT1635 op amp operates on a 1.2V supply over the full industrial temperature range with an input common mode voltage of 0V to 0.2V. The minimum supply voltage for the reference to operate properly over this temperature range is 1.3V.

Note 4: This parameter is not 100% tested. Temperature coefficient is measured by dividing the change in output voltage by specified temperature range.

Note 5: Shunt gain defines the operation in floating applications when the output is connected to the V+ terminal and input common mode is referred to V .

Note 6: If part is stored outside of the specified temperature range, the output may shift due to hysteresis.


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TYPICAL PERFOR A CE CHARACTERISTICS


Op Amp



220


200


SUPPLY CURRENT (A)

180


160


Supply Current vs Supply Voltage


TA = – 55C


100


OFFSET CURRENT (pA)

50


0

Input Bias and Offset Currents vs Temperature

Input Bias Current

vs Common Mode Voltage

0

VS = 5V, 0V

INPUT BIAS CURRENT (nA)

–1 TA = 125C

TA = 25C

–2

140


120

TA = 25C

BIAS CURRENT (nA)

–1

TA = – 55C


–3


100


80


60

TA = 125C –2 4





VS = 5V, 0V




IOS
















































IB



















–3 –5

2 3 4 5 6 7

8 9 10

–50

–25 0

25 50 75

100 125

–1 0 1 2 3 4

SUPPLY VOLTAGE (V)

1635 G01

TEMPERATURE (C)

Noise Voltage Density

1635 G02

COMMON MODE VOLTAGE (V)

1635 G03

0.1Hz to 10Hz Noise Voltage

vs Frequency

VS = 2.5V TA = 25C

INPUT NOISE VOLTAGE DENSITY (nV/Hz)

80


70


60


50


40


0.5


INPUT NOISE CURRENT DENSITY (pA/Hz)

0.4


0.3


0.2


0.1

Input Noise Current vs Frequency


VS = 2.5V TA = 25C



0 1 2 3 4


5 6 7

30

NOISE VOLTAGE (1V/DIV)

VS = 5V TA = 25C




























8 9 10 1

0

10 100 1000 1


10 100 1000

TIME (SEC)

1635 G04


Typical Distribution of Offset

FREQUENCY (Hz)


1635 G05

FREQUENCY (Hz)


Turn-On Drift


1635 G06

Voltage Drift with Temperature

25

VS = 5V, 0V


PERCENT OF UNITS

20


15


200


CHANGE IN INPUT OFFSET VOLTAGE (V)

0


– 200


– 400

Minimum Supply Voltage


TA = 125C


140


CHANGE IN OFFSET VOLTAGE (V)

120


100


80

of Three Typical Units

10

– 600

60






































































VS = 5V TA = 25C

TA = 25C

40

5


0

–6 –4 –2 0 2 4 6


– 800


–1000

0

TA = – 55C


1 2


20


0

0 1 2 3


4 5 6


7 8 9 10

TCVOS (V/C)


1635 G07

TOTAL SUPPLY VOLTAGE (V)


1635 G08

TIME AFTER POWER ON (MINUTES)

1635 G09


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TYPICAL PERFOR A CE CHARACTERISTICS


Op Amp



120

Voltage Gain vs Frequency

Gain Phase vs Frequency

60

VS

50


= 2.5V


100

Capacitive Load Handling

60

VS = 5V

RL =

100


VOLTAGE GAIN (dB)

80


PHASE MARGIN

VOLTAGE GAIN (dB)

40

30 70

TA = 25C


PHASE

120

PHASE SHIFT (DEG)

140

160

50 TA = 25C

AV = 5

OVERSHOOT (%)

40

60


40


20


0


–20

20

10

0

–10

–20

–30


GAIN

180

30

200

220 20

240

10

260

280 0

AV = 10 AV = 1







VS = 2.5V TA = 25C


















































0.01

0.1 1

10 100 1k

10k 100k 1M 10

100 1000

10 100 1000 10000

FREQUENCY (Hz)

1635 G10

FREQUENCY (kHz)

Gain-Bandwidth Product and

1635 G11

CAPACITIVE LOAD (pF)

1635 G12


0.10


0.09


SLEW RATE (V/s)

0.08


0.07


0.06


0.05

Slew Rate vs Temperature


350


GAIN-BANDWIDTH PRODUCT (kHz)

300


250


200


150

Phase Margin vs Temperature

75

VS = 2.5V


70

PHASE MARGIN


65


60


GAIN-BANDWIDTH

UCT

PROD 55

Voltage Gain vs Load Resistance

1M

VS = 5V, 0V


PHASE MARGIN (DEG)

VOLTAGE GAIN (V/V)

TA = – 55C


TA = 25C


TA = 125C







VS = 5V













FALLING SLEW RATE









RISING SLEW RATE












0.04

–50


–25 0


25 50


75 100 125

100

–50 –25 0


25 50 75

50

100 125

100k

0.1 1


10 100


1000

TEMPERATURE (C)


1635 G13

TEMPERATURE (C)


1635 G14

LOAD RESISTANCE TO GROUND (k)

1635 G15


0.5


Shunt Gain

TA = 25C

Large-Signal Transient Response VS = 5V

Large-Signal Transient Response VS = 5V, 0V


INPUT VOLTAGE CHANGE (mV)

0.4


0.3


0.2


+

VIN


0V

IOUT = 20mA

2V/DIV

1V/DIV

+


VOUT 0V

IOUT

0.1


IOUT = 1mA


AV = 1, NO LOAD


200s/DIV


1635 G17


100s/DIV

AV = 1, NO LOAD


1635 G18

0

0 1 2


3 4 5

6 7 8

INPUT 8VP-P

INPUT PULSE 0V TO 4V

OUTPUT VOLTAGE (V)


1635 G16


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TYPICAL PERFOR A CE CHARACTERISTICS


Op Amp


Output Saturation Voltage vs Input Overdrive

Output Saturation Voltage

vs Load Current (Output Low)

Output Saturation Voltage

vs Load Current (Output High)




VS = 2.5V, NO LOAD TA = 25C




OUTPUT HIGH





























OUTPUT LOW









16 1000

VS

OUTPUT SATURATION VOLTAGE (mV)

OUTPUT SATURATION VOLTAGE (mV)

V


= 2.5V

= 30mV

1

OUTPUT SATURATION VOLTAGE (V)

VS = 2.5V V = 30mV

14 OD


12

OD


TA = 25C

100

10


8


6 10

4


2


0 1

TA = 125C


TA = – 55C


0.1


0.01

TA = 25C TA = 125C


TA = – 55C

0 5 10

15 20

25 30

0.001

0.01

0.1 1 10

0.001

0.01

0.1 1 10

INPUT OVERDRIVE (mV)


1635 G19

SINKING LOAD CURRENT (mA)


1635 G20

SOURCING LOAD CURRENT (mA)


1635 G21


COMMON MODE RANGE (V)

V+ V+ – 0.5 V+ – 1


V


V – 0.5

Common Mode Range vs Temperature


COMMON MODE REJECTION RATIO (dB)

120


100


80


60


40


20

Common Mode Rejection Ratio vs Frequency


VS = 2.5V TA = 25C

POWER SUPPLY REJECTION RATIO (dB)

120


100


80


60


40


20

Power Supply Rejection Ratio vs Frequency












































V – 1

–50


–25 0


25 50


75 100 125

0

1 10 100 1k 10k


100k

0





VS = 2.5V TA = 25C




POSITIVE SUPPLY


NEGATIVE SUPPLY






















0.1


1 10 100 1k


10k 100k

TEMPERATURE (C)


1635 G22

FREQUENCY (Hz)


1635 G23

FREQUENCY (Hz)


1635 G24


10000


OUTPUT IMPEDANCE ()

1000


100


Output Impedance vs Frequency

VS = 2.5V TA = 25C

AV = 100


AV = 10 AV = 1

Small-Signal Transient Response VS = 5V


10mV/DIV

10mV/DIV

0V

Small-Signal Transient Response VS = 5V, 0V



10


AV = 1

1 CL = 15pF


50s/DIV


1635 G26


AV = 1

CL = 15pF


50s/DIV


1635 G27

0.1 1

10 100 1000

FREQUENCY (kHz)

INPUT 50mV TO 100mV


1635 G25


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TYPICAL PERFOR A CE CHARACTERISTICS


Reference


Typical Distribution of Initial Accuracy

VS = 5V, 0V





TA

= 25C


































































































20

18

16

PERCENT OF UNITS

14

12

10

8

6

4

2

0


208


207


REFERENCE OUTPUT (mV)

206


205


204


203


202


201


200


Line Regulation


VS = 5V, 0V


TA = – 55C


TA = 125C


TA = 25C


200


REFERENCE CHANGE (ppm)

0


– 200


– 400


– 600


Load Regulation


VS = 5V, 0V TA = 25C
































































194

196 198 200 202

204

206

0 2 4

6 8 10 12 14

0 1 2 3 4

REFERENCE VOLTAGE (mV)


1635 G28

SUPPLY VOLTAGE (V)


1635 G29

SOURCING CURRENT (mA)


1635 G30


205


REFERENCE OUTPUT (mV)

204


203


202


201


Reference Output vs Temperature of Two Typical Units


VS = 5V


1.5

OUTPUT SATURATION VOLTAGE (V)

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

Output Saturation

VS = 5V, 0V
























TA = – 55C








TA = 25C









TA = 125C















vs Load Current (Sourcing)


120


100


80


GAIN (dB)

60


40


20


0


–20


–40


Reference Amplifier Gain







VS = 5V, 0V



















































TA = 25C

–50

–25

0 25 50

75 100

125

0 1 2 3

1 10 100

1k 10k

100k 1M 10M

TEMPERATURE (C)


1635 G31

SOURCING CURRENT (mA)


1635 G32

FREQUENCY (Hz)


1635 G33


W

BLOCK DIAGRA

BALANCE 2 5

OUTPUT

6


REFERENCE

FEEDBACK V+

8 7


INPUTS

3


OP AMP


200mV +

REFERENCE


REF AMP

1 REFERENCE

OUTPUT


4 1635 BD

V


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APPLICATIO S I FOR ATIO

The LT1635 is fully specified with V+ = 5V, V= 0V and VCM = 2.5V. The op amp offset voltage is internally trimmed to a minimum value at these supply voltages. A unique feature of this device is that it operates from a single 1.2V supply up to 5V. A full set of specifications is provided at 5V supply voltages. The positive supply pin of the LT1635 should be bypassed with a small capacitor (about 0.1F), as well as the negative supply pin when


should be taken to keep the output from saturating. For example, a 1mV input signal will cause the amplifier to set up in its linear region in the gain 100 configuration as shown in Figure 2a. However, 1mV is not enough to make the amplifier function properly in the voltage follower mode (Figure 2b).


99R

using split supplies.

Op Amp

The LT1635 is fully specified for single supply operation, i.e., when the negative supply is 0V. Input common mode


R


1mV

5V


LT1635 OP AMP


100mV


1mV

5V


LT1635 OP AMP


OUTPUT SATURATED

2mV


1635 F02

range of the op amp includes ground and the output swings within a few millivolts of ground while sinking current. The input stage of the op amp incorporates phase reversal protection to prevent false outputs from occur- ring when the input is below the negative supply. Protec- tive resistors have been included in the input leads so that current does not become excessive when the inputs are forced below the negative supply.

The op amp also includes an offset nulling feature, this is accomplished by connecting the BALANCE pin (Pin 5) to a variable voltage derived from the reference output. The offset adjust range is asymmetrical, typically – 2mV to 8mV. At room temperature the input offset voltage of the LT1635 is within the null range, thus the offset voltage can be adjusted to zero. Figure 1 shows the standard offset adjustment.

V+

2 4

LT1635 6

3

(a) (b)

Figure 2. Gain 100 Amplifier and Voltage Follower


Distortion

There are two main contributors of distortion in op amps: distortion caused by nonlinear common mode rejection and output crossover distortion as the output transitions from sourcing to sinking current. The common mode rejection ratio of the LT1635 is very good, typically 110dB. Therefore, as long as the input operates in normal com- mon mode range, there will be very little common mode induced distortion. Crossover distortion will increase as the output load resistance decreases. For the lowest dis- tortion, the LT1635 should be operated with the output always sourcing current.

Reference

The reference of the LT1635 consists of a 200mV precision bandgap and a reference amplifier. As shown in the block

1 8

5

R1

10k

VREF


V1635 F01

diagram, the 0.2V precision bandgap is referred to Vand

is internally connected to the noninverting input of the ref- erence amplifier. This configuration offers great flexibility in that the reference voltage can be amplified or the reference amplifier can be used as a comparator. Unlike the op amp,


Output

Figure 1. Standard Offset Adjustment

the output of the reference amplifier can only swing within 0.8V (typ) of the positive rail. To guarantee that the reference amplifier does not saturate over the industrial temperature

The output voltage swing of the LT1635 is a function of input overdrive as shown in the typical performance curves. When monitoring voltages within 15mV of either rail, gain

range, the minimum operating supply should be 1.3V. The reference amplifier can source 2mA of load current and can sink 10A over the industrial temperature range.


U

TYPICAL APPLICATIO S


Low Voltage Regulator

C1 0.01F

Best Regulation

VIN > 6V



R1

28k


2

R2 3

2k

VIN > 3.2V

7

LT1635 6

4

8 +

1


VOUT 3V


OPTIONAL*

2


3


R2

48k


7

LT1635 6

4

8

1


R1

2k


VOUT 5V



*USE ELECTROLYTIC OUTPUT CAPACITORS


1635 TA03


1635 TA04


2-Terminal Current Regulator Shunt Regulator



2 7


LT1635

+

IOUT


6


= (R2 + R3)VREF (R1)(R3)

C1* 0.01F


R2


+ V =


R2V

3 4

1

R1 8

R2 R3


1635 TA05


2 7

LT1635 6

3 4

R1 1

8

OUT


1 + R1

REF

*REQUIRED FOR CAPACITIVE LOADING


1635 TA06


Negative Regulator 6V Battery-Level Indicator


R2 2 7

+ C1

47F

GROUND

R1 680k

R3 680k

+

R4 1.5k

49.9k

1%


Q1 2N3904

LT1635 6

3 4

8

1


R1

2k

ELECT

VOUT

–5V


R2

12k


2 7 D1

LT1635 6

3 4

8

1

1% VIN – 5.5V

1635 TA07

LED DIMS BELOW 7V

1635 TA08


SI PLIFIED SCHE ATICS


Op Amp


7 V+



C2


R1

6k

  1. Q1

    INPUTS R2

    6k

  2. Q2


    Q13


    Q15


    Q20

    Q21


    Q19

    Q26


    Q27


    Q28


    6


    OUTPUT

    Q4 Q7 Q17 Q18


    300k

    5


    Q3 Q5 Q6


    Q14


    Q16


    Q24


    Q25

    BALANCE


  3. V


+

1635 SSOA


C1


Reference


V+ 7



16

1

REF FB 8


1 REFOUT


V4


1635 SSREF


U

PACKAGE DESCRIPTIO


N8 Package

  1. Lead PDIP (Narrow .300 Inch)

    (Reference LTC DWG # 05-08-1510)



    (10.160) MAX


    8


    7


    6


    5



    5 0.015*

    77 0.381)











    1


    2


    3


    4


    0.400*


    0.300 – 0.325

    (7.620 – 8.255)


    0.045 – 0.065

    (1.143 – 1.651)


    0.130 0.005

    (3.302 0.127)



    0.009 – 0.015

    (0.229 – 0.381)

    0.065

    (1.651)

    TYP

    0.125


    0.25

    (6.4


    0.325

    +0.035

    8.255

    –0.015

    +0.889

    –0.381


    0.100 (2.54)

    BSC

    (3.175) MIN

    0.018 0.003

    (0.457 0.076)

    0.020

    (0.508) MIN


    N8 1098

    *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)


    11

    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.


    U

    TYPICAL APPLICATIO


    1A Shunt Battery Charger (IDARK = 230A, VFLOAT = 14V)


    100nF

    1M

    2A

    3 + 7 220

    1A SOLAR ARRAY


    200mV

    8

    +

    LT1635 REF


    1. 7V

      LT1635 6

    2. OP AMP

4 TIP121

68k

1M

7.5*

2k

10W


12V

5A GELCEL


*DALE HLM-10 1635 TA09


U

PACKAGE DESCRIPTIO


S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)



0.010 – 0.020 45

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)


0.016 – 0.050

(0.406 – 1.270)


0– 8 TYP


0.053 – 0.069

(1.346 – 1.752)


0.014 – 0.019

(0.355 – 0.483) TYP


0.004 – 0.010

(0.101 – 0.254)


0.050

(1.270) BSC


0.228 – 0.244

(5.791 – 6.197)

0.189 – 0.197*

(4.801 – 5.004)

8 7 6 5


0.150 – 0.157**

(3.810 – 3.988)

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE


1 2 3 4

SO8 1298


RELATED PARTS


PART NUMBER

DESCRIPTION

COMMENTS

LT1178/LT1179

Dual/Quad 17A Max, Single Supply Precision Op Amps

70V VOS Max and 2.5V/C Drift Max, 85kHz GBW, 0.04V/s Slew Rate, Input/Output Common Mode Includes Ground

LT1490A/LT1491A

Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps

Single Supply Input Range: – 0.4V to 44V, Micropower 50A Amplifier, Rail-to-Rail Input and Output, 200kHz GBW

LT2178/LT2179

Dual/Quad 17A Max, Single Supply Precision Op Amps

SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 85kHz GBW

LT1078/LT1079

Dual/Quad Micropower, Single Supply Precision Op Amps

70V VOS Max and 0.4V/C Drift, 200kHz GBW, 0.07V/s Slew Rate, Input/Output Common Mode Includes Ground

LT2078/LT2079

Dual/Quad Micropower, Single Supply Precision Op Amps

SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 200kHz GBW


12

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900

FAX: (408) 434-0507 TELEX: 499-3977 www.linear.com

1635fa LT/TP 0901 1.5K REV A • PRINTED IN USA


LINEAR TECHNOLOGY CORPORATION 1997

Mouser Electronics


Authorized Distributor


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LT1635IS8#PBF LT1635IN8 LT1635CS8 LT1635IS8#TR LT1635CS8#PBF LT1635CN8 LT1635IS8#TRPBF LT1635IN8#PBF LT1635CS8#TR LT1635CS8#TRPBF LT1635IS8 LT1635CN8#PBF