Linear Technology LT1635 Datasheet

FEATURES

■

Guaranteed Operation at 1.2V

■

Op Amp and Reference on Single Chip

■

Micropower: 130µA Supply Current

■

Industrial Temperature Range SO-8 Packages

■

Rail-to-Rail Output

■

High Output Current: 25mA Min

■

Output Drives 1000pF

■

Capable of Floating Mode Operation

■

Specified for 5V and ±5V Supplies

■

Low Reference Drift: 30ppm/°C

■

Industry Standard LM10 Pinout

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APPLICATIONS

■

Battery- or Solar-Powered Systems

Portable Instrumentation
Sensor Conditioning

■

Precision Current Regulators

■

Precision Voltage Regulators

■

Battery Level Indicator

■

Thermocouple Transmitter

LT1635

Micropower Rail-to-Rail

Op Amp and Reference

U

DESCRIPTION

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 130µA of supply
current.

The input common mode range of the op amp includes
ground and incorporates phase reversal protection to pre­vent 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 unity­gain stable with up to 1000pF load capacitance.

The 0.2V reference is referred to V– and 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.

TYPICAL APPLICATION

0V to 5V Regulator

C1

0.01µF

V

> 5.2V

IN

–

7

2

LT1635

+

3

1



R3
5k

6

4

8

1635 TA01

R2

3.9k

V

100k

OUT

ADJ

R1

U



V

OUT

0V TO 5V

Typical Distribution of Input Offset Voltage

25

VS = 5V, 0V

= 25°C

T

A

20

15

10

PERCENT OF UNITS

5

0

–1.0

–0.6

INPUT OFFSET VOLTAGE (mV)

–0.2

0.2

0.6

1.0

1635 TA02

1

LT1635

WW

W

ABSOLUTE MAXIMUM RATINGS

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

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

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

Output Short-Circuit Duration .......................Continuous

Operating Temperature Range

(Note 1) .............................................. –40°C to 85°C

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

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

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

U

U

W

PACKAGE/ORDER INFORMATION



ORDER PART

NUMBER

LT1635CN8
LT1635CS8
LT1635IN8
LT1635IS8

S8 PART

MARKING

REFOUT
OP AMP IN (–)
OP AMP IN (+)

N8 PACKAGE
8-LEAD PDIP

T

JMAX

T

JMAX

TOP VIEW

1
2
3

–

4

V

= 150°C, θJA = 130°C/ W (N8)
= 150°C, θJA = 190°C/ W (S8)

–
+

–

+

+

S8 PACKAGE

8-LEAD PLASTIC SO

REF FB

8

+

V

7

OP AMP OUT

6

BALANCE

5



U

1635 1635I

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

5V OP AMP: V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

VOS ADJ Offset Voltage Adjust Range Positive Adjust ● 6 8 mV

I

OS

I

B

e

n

i

n

R

IN

CMRR Common Mode Rejection Ratio VCM = 0V to 4V 92 110 dB

A

VOL

V

OL

V

OH

= 5V, 0V; VCM = V

S

Input Offset Voltage 0.3 1.3 mV

Input Offset Voltage Drift –40°C ≤ TA ≤ 85°C (Note 3) ● 3.0 7.0 µV/°C

Input Offset Current ● 0.2 0.6 nA
Input Bias Current 2.0 4.0 nA

Input Noise Voltage 0.1Hz to 10Hz 1 µV
Input Noise Voltage Density f = 1kHz 50 nV/√Hz
Input Noise Current Density f = 1kHz 0.05 pA/√Hz
Input Resistance Differential ● 725 MΩ

Input Voltage Range ● 04V

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

Shunt Gain I

Output Voltage Swing Low VS = 5V, No Load ● 210 mV

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

= 2.5V, TA = 25°C, unless otherwise noted. (Note 1)

OUT

0°C ≤ TA ≤ 70°C ● 0.5 1.6 mV
–40°C ≤ T

Negative Adjust

Common Mode, VCM = 0V to 4V 6 GΩ

V

O

V

O

OUT

V

O

(Note 4) ● 8 20 V/mV

V

S

V

S

V

S

V

S

≤ 85°C ● 1.8 mV

A

= 200mV to 4.5V, RL = 1.1k ● 45 200 V/mV
= 200mV to 4.5V, RL = 500Ω ● 35 150 V/mV

= 0.1mA to 5mA V/mV

= 1.5V to 6.45V 15 25 V/mV

= 5V, I
= 5V, I

= 5V, I
= 5V, I

= 5mA ● 125 250 mV

SINK

= 10mA ● 200 500 mV

SINK

= 5mA ● 4.65 4.8 V

SOURCE

= 10mA ● 4.55 4.75 V

SOURCE

● –1.4 – 2 mV

● 2.5 5.0 nA

P-P

● 85 97 dB

2

ELECTRICAL CHARACTERISTICS

LT1635

5V OP AMP: V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

I

SC

PSRR Power Supply Rejection Ratio VS = 1.2V to 12V, VCM = VO = 0.2V 93 100 dB

I

S

GBW Gain Bandwidth Product f = 1kHz 175 kHz
SR Slew Rate AV = –1, R

5V REFERENCE: V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

REF

TC V

REF

= 5V, 0V; VCM = V

S

Short-Circuit Current VS = 5V, Short to GND ● 25 40 mA

Minimum Operating Supply Voltage (Note 2) ● 1.1 1.2 V
Supply Current 130 200 µA

= 5V, 0V; TA = 25°C, unless otherwise noted. (Note 1)

S

Feedback Sense Voltage Voltage at Pin 1 with Pin 1 Connected ● 189 200 211 mV

Reference Drift (Note 3) ● 30 100 ppm/°C
Feedback Current Current into Pin 8 3.5 10 nA

Line Regulation 0 ≤ I

Load Regulation I

Reference Amplifier Gain VO = 0.2V to 3.5V 45 90 V/mV

= 2.5V, TA = 25°C, unless otherwise noted. (Note 1)

OUT

= 5V, Short to V

V

S

to Pin 8 (Note 5)

≤ 1mA, V

REF

= 1.2V to 5V 20 35 ppm/V

V

S

= 1.3V to 5V (Note 2) ● 30 55 ppm/ V

V

S

= 0 to 1mA 150 300 ppm/mA

REF

CC

= ∞ 0.045 V/µs

L

= 200mV

REF

● 25 40 mA

● 90 97 dB

● 150 260 µA

● 5.0 15 nA

● 200 500 ppm/mA

● 25 50 V/mV

±5V OP AMP: V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

VOS ADJ Offset Voltage Adjust Range Positive Adjust ● 6 8 mV

I

OS

I

B

e

n

i

n

R

IN

CMRR Common Mode Rejection Ratio VCM = –5V to 4V 94 115 dB

= ±5V; VCM = V

S

Input Offset Voltage 0.3 1.5 mV

Input Offset Voltage Drift 0°C ≤ TA ≤ 85°C (Note 3) ● 4.5 10.0 µV/°C

Input Offset Current ● 0.2 0.6 nA
Input Bias Current 2.0 4 nA

Input Noise Voltage 0.1Hz to 10Hz 1 µV
Input Noise Voltage Density f = 1kHz 50 nV/√Hz
Input Noise Current Density f = 1kHz 0.05 pA/√Hz
Input Resistance Differential ● 735 MΩ

Input Voltage Range ● –5 4 V

= 0V, TA = 25°C, unless otherwise noted. (Note 1)

OUT

≤ 70°C ● 0.5 1.9 mV

0°C ≤ T

A

–40°C ≤ TA ≤ 85°C ● 2.1 mV

Negative Adjust ● –1.4 –2 mV

Common Mode, V

= –5V to 4V 9 GΩ

CM

● 2.5 5 nA

P-P

● 91 110 dB

3

LT1635

ELECTRICAL CHARACTERISTICS

±5V OP AMP: V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

A

VOL

V

O

I

SC

PSRR Power Supply Rejection Ratio VS = ±1V to ±6V, VCM = VO = 0V 90 100 dB

I

S

GBW Gain Bandwidth Product f = 1kHz 175 kHz
SR Slew Rate AV = –1, R

±5V REFERENCE: V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

REF

TC V

REF

= ±5V; VCM = V

S

Large-Signal Voltage Gain VO = –4.5V to 4.5V, No Load ● 175 300 V/mV

Output Voltage Swing VS = ±5V, No Load ● ±4.975 ±4.985 mV

Short-Circuit Current VS = ±5V ±25 ±40 mA

Supply Current 135 215 µA

= ±5V, TA = 25°C, unless otherwise noted. (Note 1)

S

Feedback Sense Voltage Voltage at Pin 1 with Pin 1 Connected ● 189 200 211 mV

Reference Drift (Note 3) ● 40 120 ppm/°C
Feedback Current Current into Pin 8 3.5 10 nA

Line Regulation 0 ≤ I

Load Regulation I

Reference Amplifier Gain VO = 0.2V to 8.5V 45 90 V/mV

= 0V, TA = 25°C, unless otherwise noted. (Note 1)

OUT

V

= –4.5V to 4.5V, RL = 1.1k ● 15 100 V/mV

O

V

= –4.5V to 4.5V, RL = 500Ω ● 10 60 V/mV

O

V

= ±5V, I

S

V

= ±5V, I

S

to Pin 8 (Note 5)

REF

V

= ±0.6V to ±5V 20 25 ppm /V

S

= ±0.65V to ±5V (Note 2) ● 30 55 ppm/V

V

S

= 0 to 1mA 150 300 ppm/mA

REF

VS = 10V, 0V ● 25 50 V/mV

= 5mA ● ±4.65 ±4.75 mV

SINK

= 10mA ● ±4.5 ±4.6 mV

SINK

= ∞ 0.05 V/µs

L

≤ 1mA, V

= 200mV

REF

● 88 98 dB

● 160 280 µA

● 5.0 15 nA

● 200 500 ppm/mA

The ● denotes specifications that apply over the full operating temperature
range.

Note 1: The LT1635C is guaranteed to operate over the commercial
temperature range of 0°C to 70°C. It is designed, characterized and
expected to meet these extended temperature limits, but is not tested at
–40°C and 85°C. The LT1635I is guaranteed to meet the industrial
temperature range.

Note 2: The LT1635 op amp operates on a 1.2V supply over the full
industrial temperature range with an input common mode of 0V to 0.2V.
The minimum supply voltage for the reference to operate properly over
this temperature range is 1.3V.

4

Note 3: This parameter is not 100% tested. Temperature coefficient is
measured by dividing the change in output voltage by specified
temperature range.

Note 4: Shunt gain defines the operation in floating applications when the
output is connected to the V
referred to V

Note 5: If part is stored outside of the specified temperature range, the
output may shift due to hysteresis.

–

.

+

terminal and input common mode is