Datasheet

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LT1634

1634fe

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Micropower Precision

Shunt Voltage Reference

Super Accurate ±4.096V Output References

Initial Voltage Accuracy: 0.05%

Low Operating Current: 10μA

Low Drift: 10ppm/°C Max

Less Than 1Ω Dynamic Impedance

Both Commercial and Industrial Temperature Range

Parts Are Available

Available in 1.25V, 2.5V, 4.096V and 5V in SO-8

and TO-92 Packages

1.25V and 2.5V Available in MSOP Package

Portable Meters

Precision Regulators

A/D and D/A Converters

Calibrators

The LT

1634 is a micropower, precision, shunt voltage

reference. The bandgap reference uses trimmed preci-

sion thin ﬁ lm resistors to achieve 0.05% initial voltage

accuracy. Improved curvature correction technique guar-

antees 10ppm/°C maximum temperature drift. Advances

in design, processing and packaging techniques guarantee

10μA operation and low temperature cycling hysteresis.

The LT1634 does not require an output compensation

capacitor, but is stable with capacitive loads. Low dynamic

impedance makes the LT1634 reference easy to use from

unregulated supplies.

The LT1634 reference can be used as a high performance

upgrade to the LM185/LM385, LT1004 and LT1034 where

lower power and guaranteed temperature drift is

required.

–

LT1495

–5V

LT1634-4.096

= 200μA

OUTPUT ACCURACY

BETTER THAN 0.075%

AT ±500μA OUTPUT

LTC

1043

–5V

1634 TA01

1μF

45k

OUT

4.096V

–

LT1495

OUT

–4.096V

TEMPERATURE (°C)

–40

REVERSE VOLTAGE CHANGE (mV)

1.5

1634 TA02

–1.0

–20 20

–1.5

–2.0

2.0

1.0

0.5

–0.5

40 60 80 100

= 10μA

OUT

= 1.25V

Temperature Drift

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

All other trademarks are the property of their respective owners.

Summary of content (12 pages)

PAGE 1
LT1634 Micropower Precision Shunt Voltage Reference FEATURES DESCRIPTION n The LT®1634 is a micropower, precision, shunt voltage reference. The bandgap reference uses trimmed precision thin ﬁlm resistors to achieve 0.05% initial voltage accuracy. Improved curvature correction technique guarantees 10ppm/°C maximum temperature drift. Advances in design, processing and packaging techniques guarantee 10μA operation and low temperature cycling hysteresis.
PAGE 2
LT1634 ABSOLUTE MAXIMUM RATINGS (Note 1) Current Operating 1.25V ...............................................................100mA 2.5V ...................................................................50mA 4.096V, 5V .........................................................30mA Forward Current .....................................................20mA Operating Temperature Range Commercial ............................................. 0°C to 70°C Industrial .............................................
PAGE 3
LT1634 AVAILABLE OPTIONS TEMPERATURE 0°C to 70°C ACCURACY (%) 0.05 TEMPERATURE COEFFICIENT (ppm/°C) 10 –40°C to 85°C 0.05 10 0°C to 70°C 0.05 25 –40°C to 85°C 0.05 25 0°C to 70°C 0.20 25 PACKAGE TYPE S8 LT1634ACS8-1.25 LT1634ACS8-2.5 LT1634ACS8-4.096 LT1634ACS8-5 LT1634AIS8-1.25 LT1634AIS8-2.5 LT1634AIS8-4.096 LT1634AIS8-5 LT1634BCS8-1.25 LT1634BCS8-2.5 LT1634BCS8-4.096 LT1634BCS8-5 LT1634BIS8-1.25 LT1634BIS8-2.5 LT1634BIS8-4.096 LT1634BIS8-5 MS8 LT1634BCMS8-1.25 LT1634BCMS8-2.
PAGE 4
LT1634 2.5V ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C.
PAGE 5
LT1634 4.096V ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Temperature Coefﬁcient (Note 8) Reverse Dynamic Impedance (Note 5) LT1634A, IR = 20μA LT1634B/LT1634C, IR = 20μA 20μA ≤ IR ≤ 2mA Low Frequency Noise (Note 6) Hysteresis (Note 7) MIN TYP MAX UNITS 10 25 0.75 1.50 IR = 20μA, 0.1Hz ≤ f ≤ 10Hz 4 10 0.15 0.
PAGE 6
LT1634 1.25V TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics 10μA 100μA 200μA 500μA 1mA 6 4 2 0.8 0.4 1.2 REVERSE VOLTAGE (V) 0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –40 1.6 TA = –40°C TO 85°C REVERSE VOLTAGE CHANGE (mV) REVERSE VOLTAGE CHANGE (mV) TA = –40°C TO 85°C 8 40 20 0 TEMPERATURE (°C) –20 60 Reverse Dynamic Impedance 1 0 0.01 Dynamic Impedance vs Frequency TA = 25°C f = 25Hz DYNAMIC IMPEDANCE (Ω) 1 0.1 1 10 0.01 REVERSE CURRENT (mA) 100 Forward Characteristics 1.
PAGE 7
LT1634 2.5V TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics 6 4 2 0 0.5 1.5 2.0 1.0 REVERSE VOLTAGE (V) 2.5 3 2 1 0 –1 –2 –3 –4 –40 3.0 TA = –40°C TO 85°C 10μA 100μA 200μA 500μA 1mA REVERSE VOLTAGE CHANGE (mV) 8 0 6 4 TA = –40°C TO 85°C REVERSE VOLTAGE CHANGE (mV) 40 20 0 TEMPERATURE (°C) –20 60 Reverse Dynamic Impedance 10 1 0.1 1 10 0.01 REVERSE CURRENT (mA) 100 TA = 25°C IR = 10μA COUT = 0μF 100 IR = 10μA COUT = 0.068μF IR = 100μA COUT = 0.
PAGE 8
LT1634 4.096V TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics 20 5 6 12 8 4 0 2 3 4 REVERSE VOLTAGE (V) 1 4 2 0 –2 –4 –6 –40 5 –20 0 40 20 TEMPERATURE (°C) 1634-4 G01 3 2 1 DYNAMIC IMPEDANCE (Ω) 0.1 1 10 0.01 REVERSE CURRENT (mA) 100 Forward Characteristics TA = 25°C IR = 20μA COUT = 0μF 1000 100 IR = 20μA COUT = 0.033μF 10 IR = 100μA COUT = 0.33μF IR = 100μA COUT = 0μF 1 0.1 0.01 0.1 1 10 FREQUENCY (kHz) 100 0.8 0.4 0 0.01 0.
PAGE 9
LT1634 5V TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics 20 5 8 16 12 8 4 0 2 3 4 REVERSE VOLTAGE (V) 1 5 20μA 100μA 200μA 500μA 1mA 6 4 2 0 –2 –4 –6 –8 –40 6 REVERSE VOLTAGE CHANGE (mV) REVERSE VOLTAGE CHANGE (mV) –20 0 40 20 TEMPERATURE (°C) 60 1634-5 G01 DYNAMIC IMPEDANCE (Ω) DYNAMIC IMPEDANCE (Ω) 1 0.1 1 10 0.01 REVERSE CURRENT (mA) 100 Forward Characteristics IR = 20μA COUT = 0μF 100 10 IR = 100μA COUT = 0μF 1 0.1 0.01 0.1 IR = 20μA COUT = 0.
PAGE 10
LT1634 APPLICATIONS INFORMATION The reverse characteristics of the LT1634 behave like a resistor in parallel with a Zener diode. This simple, well behaved characteristic is important to the proper operation of circuits like Figure 1. The adjustable output voltage reference depends upon positive feedback from the LT1495’s output to start-up and regulate the bias current for the LT1634. VIN ≥ 10.5V – 1.25V V RB = OUT 10μA + VOUT 1.5V TO 10V LT1495 LT1634-1.25 – R1 50k TO 1.
PAGE 11
LT1634 PACKAGE DESCRIPTION MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 p 0.127 (.035 p .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.42 p 0.038 (.0165 p .0015) TYP 3.00 p 0.102 (.118 p .004) (NOTE 3) 0.65 (.0256) BSC 8 0.52 (.0205) REF 7 6 5 RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 p 0.102 (.118 p .004) (NOTE 4) 4.90 p 0.152 (.193 p .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 1 0.53 p 0.152 (.021 p .006) 2 3 4 1.10 (.043) MAX DETAIL “A” 0.86 (.
PAGE 12
LT1634 TYPICAL APPLICATIONS Single Cell Li-Ion Battery Supervisory Circuit (IQ = 20μA) OFF CHARGER VBAT SW T0 LOAD 1.75V – A2 1/4 LT1496 RS 51k 5% + + A1 1/4 LT1496 R1 500k 0.1% – VBAT + 1.25V A3 1/4 LT1496 RH1 10M 5% D1 RH2 10M 5% D2 A RSW 1M 5% BATTERY – A4 1/4 LT1496 – + R2 1.25M 0.1% LT1634-1.25 R3 1.75M 0.1% R4 1.25M 0.1% 1634 TA05 D1, D2: 1N458 R1 TO R4: CAR6 SERIES IRC (512) 992-7900 Micropower Voltage and Current Reference R3 249k 0.