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LT1634 Micropower Precision Shunt Voltage Reference
FEATURES
s s s s s
DESCRIPTIO
s s
Initial Voltage Accuracy: 0.05% Low Operating Current: 10A Low Drift: 10ppm/C Max Less Than 1 Dynamic Impedance 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 Both Commercial and Industrial Temperature Range Parts Are Available
APPLICATIO S
s s s s
The LT (R)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 10A 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Portable Meters Precision Regulators A/D and D/A Converters Calibrators
TYPICAL APPLICATIO
5V 45k
Super Accurate 4.096V Output References
+
LT1634-4.096 LT1495 VOUT 4.096V
-
- 5V
2.0 REVERSE VOLTAGE CHANGE (mV) 1.5 1.0 0.5 0 - 0.5 -1.0 -1.5 -2.0 - 40 -20
VOUT - 4.096V
5V 4 5 IS = 200A OUTPUT ACCURACY BETTER THAN 0.075% AT 500A OUTPUT LTC(R)1043 6
IR = 10A VOUT = 1.25V
1F 15 17 - 5V 5V 18
-
LT1495
+
1F - 5V
1634 TA01
U
Temperature Drift
20 40 60 0 TEMPERATURE (C) 80 100
1634 TA02
U
U
1634FB
1
LT1634
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Operating Current 1.25V ............................................................. 100mA 2.5V ................................................................. 50mA 4.096V, 5V ....................................................... 30mA Forward Current .................................................. 20mA
PACKAGE/ORDER INFORMATION
TOP VIEW TOP VIEW DNC* DNC* DNC* GND 1 2 3 4 8 7 6 5 DNC* DNC* VOUT TEST** DNC* 1 DNC* 2 DNC* 3 GND 4 8 DNC* 7 DNC* 6 VOUT 5 TEST**
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125C, JA = 250C/ W
ORDER PART NUMBER LT1634BCMS8-1.25 LT1634BCMS8-2.5
MS8 PART MARKING LTCV LTDF
BOTTOM VIEW
ORDER PART NUMBER LT1634CCZ-1.25 LT1634CCZ-2.5 LT1634CCZ-4.096 LT1634CCZ-5
TEST** VOUT
GND
Z PACKAGE 3-LEAD PLASTIC TO-92 TJMAX = 125C, JA = 190C/ W
*Connected internally. Do Not Connect external circuitry to these pins. **Connect to ground in user application. Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
WW
U
W
Operating Temperature Range Commercial ............................................. 0C to 70C Industrial ............................................ - 40C to 85C Storage Temperature Range (Note 1) ... - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 190C/ W
ORDER PART NUMBER 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
S8 PART MARKING 1634A1 1634A2 1634A4 1634A5 634AI1 634AI2 634AI4 634AI5 1634B1 1634B2 1634B4 1634B5 634BI1 634BI2 634BI4 634BI5
1634FB
LT1634
AVAILABLE OPTIO S
TEMPERATURE 0C to 70C ACCURACY (%) 0.05 TEMPERATURE COEFFICIENT (ppm/C) 10 MS8 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 Z
- 40C to 85C
0.05
0C to 70C
0.05
- 40C to 85C
0.05
0C to 70C
0.20
1.25V ELECTRICAL CHARACTERISTICS
PARAMETER Reverse Breakdown Voltage
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3)
CONDITIONS LT1634ACS8/LT1634BCMS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 10A) LT1634CCZ (IR = 10A) LT1634ACS8 (IR = 10A) LT1634AIS8 (IR = 10A) LT1634BCS8/LT1634BCMS8 (IR = 10A) LT1634BIS8 (IR = 10A) LT1634CCZ (IR = 10A) Reverse Breakdown Change with Current (Note 4) 10A IR 2mA
q q q q q q
Minimum Operating Current Temperature Coefficient (Note 8) Reverse Dynamic Impedance (Note 5) Low Frequency Noise (Note 6) Hysteresis (Note 7)
U
10
25
LT1634BCMS8-1.25 LT1634BCMS8-2.5
25
25
LT1634CCZ-1.25 LT1634CCZ-2.5 LT1634CCZ-4.096 LT1634CCZ-5
MIN 1.24937 - 0.05 1.24750 - 0.20 1.24849 - 0.12 1.24781 - 0.175 1.24718 - 0.225 1.24547 - 0.362 1.24531 - 0.375
TYP 1.250 1.250 1.250 1.250 1.250 1.250 1.250 0.25 0.30 2 2 4 10 0.125 0.150 10 160 40
2mA IR 20mA
q q
LT1634A, IR = 10A LT1634B/LT1634C, IR = 10A 10A IR 2mA IR = 10A, 0.1Hz f 10Hz T = - 40C to 85C T = 0C to 70C
q q q
MAX 1.25062 0.05 1.25250 0.20 1.25149 0.12 1.25218 0.175 1.25281 0.225 1.25453 0.362 1.25469 0.375 1 2 8 10 7 10 25 0.5 1.0
UNITS V % V % V % V % V % V % V % mV mV mV mV A ppm/C ppm/C VP-P ppm ppm
1634FB
3
LT1634
2.5V ELECTRICAL CHARACTERISTICS
PARAMETER Reverse Breakdown Voltage
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3)
CONDITIONS LT1634ACS8/LT1634BCMS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 10A) LT1634CCZ (IR = 10A) LT1634ACS8 (IR = 10A) LT1634AIS8 (IR = 10A) LT1634BCMS8/LT1634BCS8 (IR = 10A) LT1634BIS8 (IR = 10A) LT1634CCZ (IR = 10A)
q q q q q
MIN 2.49875 - 0.05 2.49500 - 0.20 2.49700 - 0.12 2.49562 - 0.175 2.49437 - 0.225 2.49094 - 0.362 2.49062 - 0.375
TYP 2.500 2.500 2.500 2.500 2.500 2.500 2.500 0.30 0.40 2 2 4 10 0.15 0.20 15 160 40
Reverse Breakdown Change with Current (Note 4)
10A IR 2mA
q
2mA IR 20mA
q
Minimum Operating Current Temperature Coefficient (Note 8) Reverse Dynamic Impedance (Note 5) Low Frequency Noise (Note 6) Hysteresis (Note 7)
q
LT1634A, IR = 10A LT1634B/LT1634C, IR = 10A 10A IR 2mA IR = 10A, 0.1Hz f 10Hz T = - 40C to 85C T = 0C to 70C
q q q
MAX 2.50125 0.05 2.50500 0.20 2.50300 0.12 2.50437 0.175 2.50562 0.225 2.50906 0.362 2.50937 0.375 1.5 3.0 8 10 8 10 25 0.75 1.50
UNITS V % V % V % V % V % V % V % mV mV mV mV A ppm/C ppm/C VP-P ppm ppm
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3)
PARAMETER Reverse Breakdown Voltage CONDITIONS LT1634ACS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 20A) LT1634CCZ (IR = 20A) LT1634ACS8 (IR = 20A) LT1634AIS8 (IR = 20A) LT1634BCS8 (IR = 20A) LT1634BIS8 (IR = 20A) LT1634CCZ (IR = 20A) Reverse Breakdown Change with Current (Note 4) 20A IR 2mA
q q q q q q
4.096V ELECTRICAL CHARACTERISTICS
MIN 4.09395 - 0.05 4.08780 - 0.20 4.09108 - 0.12 4.08883 - 0.175 4.08678 - 0.225 4.08115 - 0.362 4.08064 - 0.375
TYP 4.096 4.096 4.096 4.096 4.096 4.096 4.096 0.3 0.4 6 6
2mA IR 20mA
q
Minimum Operating Current
q
MAX 4.09805 0.05 4.10419 0.20 4.10091 0.12 4.10317 0.175 4.10522 0.225 4.11085 0.362 4.11137 0.375 1.5 3.0 15 20 15
UNITS V % V % V % V % V % V % V % mV mV mV mV A
1634FB
4
LT1634
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3)
PARAMETER Temperature Coefficient (Note 8) Reverse Dynamic Impedance (Note 5) Low Frequency Noise (Note 6) Hysteresis (Note 7) CONDITIONS LT1634A, IR = 20A LT1634B/LT1634C, IR = 20A 20A IR 2mA
q q q
4.096V ELECTRICAL CHARACTERISTICS
MIN
TYP 4 10 0.15 0.20 30 160 40
MAX 10 25 0.75 1.50
UNITS ppm/C ppm/C VP-P ppm ppm
IR = 20A, 0.1Hz f 10Hz T = - 40C to 85C T = 0C to 70C
5V ELECTRICAL CHARACTERISTICS
PARAMETER Reverse Breakdown Voltage CONDITIONS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3)
MIN 4.99750 - 0.05 4.99000 - 0.20
q q q q q
TYP 5.000 5.000 5.000 5.000 5.000 5.000 5.000 0.3 0.4 6 6 4 10 0.15 0.20 35 160 40
MAX 5.00250 0.05 5.01000 0.20 5.00600 0.12 5.00875 0.175 5.01125 0.225 5.01813 0.362 5.01876 0.375 1.5 3.0 15 20 15 10 25 0.75 1.50
UNITS V % V % V % V % V % V % V % mV mV mV mV A ppm/C ppm/C VP-P ppm ppm
LT1634ACS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 20A) LT1634CCZ (IR = 20A) LT1634ACS8 (IR = 20A) LT1634AIS8 (IR = 20A) LT1634BCS8 (IR = 20A) LT1634BIS8 (IR = 20A) LT1634CCZ (IR = 20A)
4.99400 - 0.12 4.99125 - 0.175 4.98875 - 0.225 498188 - 0.362 4.98126 - 0.375
Reverse Breakdown Change with Current (Note 4)
20A IR 2mA
q
2mA IR 20mA
q
Minimum Operating Current Temperature Coefficient (Note 8) Reverse Dynamic Impedance (Note 5) Low Frequency Noise (Note 6) Hysteresis (Note 7) LT1634A, IR = 20A LT1634B/LT1634C, IR = 20A 20A IR 2mA
q q q q
IR = 20A, 0.1Hz f 10Hz T = - 40C to 85C T = 0C to 70C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: If the part is stored outside of the specific operating temperature range, the output may shift due to hysteresis. Note 3: ESD (Electrostatic Discharge) sensitive device. Use proper ESD handling precautions. Note 4: Output requires 0.1F for operating current greater than 1mA. Note 5: This parameter is guaranteed by "reverse breakdown change with current" test. Note 6: Peak-to-peak noise is measured with a single highpass filter at 0.1Hz and 2-pole lowpass filter at 10Hz.
Note 7: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25C but the IC is cycled to 85C or - 40C before successive measurements. Hysteresis is roughly proportional to the square of the temperature change. Hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. Note 8: Temperature coefficient is calculated from the minimum and maximum output voltage measured at TMIN, Room and TMAX as follows: TC = (VOMAX - VOMIN)/(TMAX - TMIN) Incremental slope is also measured at 25C.
1634FB
5
LT1634 1.25V TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
10 2.0 TA = - 40C TO 85C REVERSE VOLTAGE CHANGE (mV) 1.5 1.0 0.5 0 - 0.5 -1.0 -1.5 -2.0 - 40 -20 20 40 0 TEMPERATURE (C) 60 80
REVERSE CURRENT (A)
8
REVERSE VOLTAGE CHANGE (mV)
6
4
2
0
0
0.8 0.4 1.2 REVERSE VOLTAGE (V)
1.6
1634-1.25 G01
Reverse Dynamic Impedance
100 TA = 25C f = 25Hz DYNAMIC IMPEDANCE ()
DYNAMIC IMPEDANCE ()
10
100
IR = 10A COUT = 0F
IR = 10A COUT = 0.022F
FORWARD VOLTAGE (V)
1
0.1 0.001
0.01 10 0.1 1 REVERSE CURRENT (mA)
100
1634-1.25 G04
0.1Hz to 10Hz Noise
8 TA = - 40C TO 85C 6 IR = 10A
NOISE VOLTAGE (V/DIV)
4 2 0 -2 -4 -6 -8 0 10 20 30 40 50 TIME (SEC) 60 70
1634-1.25 G07
6
UW
10000 1000 10 1
Temperature Drift
4 10A 100A 200A 500A 1mA
Reverse Voltage Change vs Current
TA = - 40C TO 85C
3
2
1
0 0.01
0.1 1 10 REVERSE CURRENT (mA)
100
1634-1.25 G03
1634-1.25 TA02
Dynamic Impedance vs Frequency
1.2 TA = 25C
Forward Characteristics
TA = 25C
0.8
IR = 100A COUT = 0.47F IR = 100A COUT = 0F
0.4
0.1 0.01
0.1
1 10 FREQUENCY (kHz)
100
1634-1.25 G05
0 0.01
0.1 1 10 FORWARD CURRENT (mA)
100
1634-1.25 G06
Response Time
1.5V 1V 0.5V 0V 5V 0V IR = 10A COUT = 0 200s/DIV
1634-1.25 G08
Response Time
1.5V 1V 0.5V OUT 0V 5V IN 0V IR = 10A COUT = 0.1F 20ms/DIV
1634-1.25 G09
OUT
IN
1634FB
LT1634 2.5V TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
10 4 TA = - 40C TO 85C REVERSE VOLTAGE CHANGE (mV) 3 2 1 0 -1 -2 -3 -4 - 40 -20 20 40 0 TEMPERATURE (C) 60 80
REVERSE VOLTAGE CHANGE (mV)
8 REVERSE CURRENT (A)
6
4
2
0 0 0.5 1.5 2.0 1.0 REVERSE VOLTAGE (V) 2.5 3.0
1634-2.5 G01
Reverse Dynamic Impedance
100 TA = 25C f = 25Hz
DYNAMIC IMPEDANCE ()
DYNAMIC IMPEDANCE ()
10
100
IR = 10A COUT = 0F
FORWARD VOLTAGE (V)
1
0.1 0.001
0.01 0.1 1 10 REVERSE CURRENT (mA)
100
1635-2.5 G04
0.1Hz to 10Hz Noise
20 15 TA = - 40C TO 85C IR = 10A
NOISE VOLTAGE (V/DIV)
10 5 0 -5 -10 -15 -20 0 10 20 30 40 50 60 70 80
TIME (SEC)
1634-2.5 G07
UW
Temperature Drift
6
10A 100A 200A 500A 1mA
Reverse Voltage Change vs Current
TA = - 40C TO 85C 5 4 3 2 1 0 0.01
0.1 1 10 REVERSE CURRENT (mA)
100
1634-2.5 G03
1634-2.5 G02
Dynamic Impedance vs Frequency
10000 TA = 25C 1000 0.8 1.2
Forward Characteristics
TA = 25C
IR = 10A COUT = 0.068F IR = 100A COUT = 0.47F
10 IR = 100A COUT = 0F
0.4
1
0.1 0.01
0.1
1 10 FREQUENCY (kHz)
100
1634-2.5 G05
0 0.01
0.1 1 10 FORWARD CURRENT (mA)
100
1634-2.5 G06
Response Time
3V 2V 1V 0V 5V 0V IR = 10A COUT = 0 200s/DIV
1634-2.5 G08
Response Time
3V 2V 1V 0V 5V 0V IR = 10A COUT = 0.1F 20ms/DIV
1634-2.5 G09
1634FB
7
LT1634 4.096V TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
20 TA = - 40C to 85C REVERSE VOLTAGE CHANGE (mV) 16 4 2 0 -2 -4 -6 - 40 6
REVERSE VOLTAGE CHANGE (mV)
REVERSE CURRENT (A)
12
8
4
0
0
1
2 3 4 REVERSE VOLTAGE (V)
5
1634-4 G01
Reverse Dynamic Impedance
100 TA = 25C f = 25Hz
DYNAMIC IMPEDANCE ()
10000
DYNAMIC IMPEDANCE ()
FORWARD VOLTAGE (V)
10
1
0.1 0.001
0.01 0.1 1 10 REVERSE CURRENT (mA)
100
1635-4 G04
0.1Hz to 10Hz Noise
40 30
NOISE VOLTAGE (V/DIV)
TA = - 40C TO 85C IR = 20A
20 10 0 -10 - 20 - 30 - 40 0 10 20 30 40 50 TIME (SEC) 60 70 80
1634-4 G06
8
UW
1000 100 10 1 0.1 0.01
Temperature Drift
5 20A 100A 200A 500A 1mA
Reverse Voltage Change vs Current
TA = - 40C TO 85C
4
3
2
1
- 20
40 20 TEMPERATURE (C)
0
60
80
1634-4 G02
0 0.01
0.1 1 10 REVERSE CURRENT (mA)
100
1634-4 G03
Dynamic Impedance vs Frequency
1.2 TA = 25C IR = 20A COUT = 0F IR = 20A COUT = 0.033F IR = 100A COUT = 0.33F IR = 100A COUT = 0F
Forward Characteristics
TA = 25C
0.8
0.4
0.1
1 10 FREQUENCY (kHz)
100
1634-4 G05
0 0.01
0.1 1 10 FORWARD CURRENT (mA)
100
1634-2.5 G06
Response Time
6V 4V 2V 0V 10V 0V IR = 20A COUT = 0 500s/DIV
1634-4 G07
Response Time
6V 4V 2V 0V 10V 0V IR = 20A COUT = 0.1F 20ms/DIV
1634-2.5 G08
1634FB
LT1634 5V TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
20 TA = - 40C TO 85C REVERSE VOLTAGE CHANGE (mV) 6 4 2 0 -2 -4 -6 -8 - 40 - 20 40 20 TEMPERATURE (C) 0 60 80
1634-5 G02
REVERSE VOLTAGE CHANGE (mV)
REVERSE CURRENT (A)
16
12
8
4
0
0
1
2 3 4 REVERSE VOLTAGE (V)
5
1634-5 G01
Reverse Dynamic Impedance
100 TA = 25C f = 25Hz DYNAMIC IMPEDANCE ()
DYNAMIC IMPEDANCE ()
1000 10000
FORWARD VOLTAGE (V)
10
1
0.1 0.001
0.01 0.1 1 10 REVERSE CURRENT (mA)
1635-5 G04
0.1Hz to 10Hz Noise
40 30 TA = - 40C TO 85C IR = 20A
NOISE VOLTAGE (V/DIV)
20 10 0 -10 - 20 -30 - 40 0 10 20 30 40 50 TIME (SEC) 60 70 80
1634-5 G06
UW
6
Temperature Drift
8 20A 100A 200A 500A 1mA 5
Reverse Voltage Change vs Current
TA = -40C TO 85C 4
3
2
1
0 0.01
0.1 1 10 REVERSE CURRENT (mA)
100
1634-5 G03
Dynamic Impedance vs Frequency
1.2 TA = 25C IR = 20A COUT = 0F
Forward Characteristics
TA = 25C
0.8
100 IR = 20A COUT = 0.1F IR = 100A COUT = 0.22F
10
0.4
1
IR = 100A COUT = 0F
100
0.1 0.01
0.1
1 10 FREQUENCY (kHz)
100
1634-5 G05
0 0.01
0.1 1 10 FORWARD CURRENT (mA)
100
1634-2.5 G06
Response Time
6V 4V 2V 0V 10V 0V IR = 20A COUT = 0 500s/DIV
1634-5 G07
Response Time
6V 4V 2V 0V 10V 0V IR = 20A COUT = 0.1F 20ms/DIV
1634-5 G08
1634FB
9
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.
- 1.25V V RB = OUT 10A LT1634-1.25
Figure 1. Adjustable Output Voltage Reference
TYPICAL APPLICATIONS
Reference for Micropower A/D Converter
5V 18k VIN 1 2 LT1634-4.096 0.1F 3 4 LTC1286 VREF + IN - IN VCC CLK DOUT 8 7 6 5 C/P SERIAL INTERFACE
1634 TA03
The LT1634-5 Generates the LTC1448 Dual 12-Bit DAC's Reference and Supply Voltage
7.5V TO 12V 3.48k 1 C/P SERIAL INTERFACE 2 3 4 0.1F LTC1448 CLK DIN CS/LD REF VOUTB VCC GND VOUTA 8 7 6 5 0.1F VOUTA
1634 TA04
LT1634-5
10
U
W
U
U
U
VIN 10.5V
+
LT1495 VOUT 1.5V TO 10V R1 50k TO 1.75M R2 250k
1634 F01
-
5V 0.1F
GND CS/SHDN
VOUTB
1634FB
LT1634
PACKAGE DESCRIPTION
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 0.127 (.035 .005) GAUGE PLANE 5.23 (.206) MIN 0.53 0.015 (.021 .006) 0.18 (.077) 0.42 0.04 (.0165 .0015) TYP 0.65 (.0256) BSC SEATING PLANE DETAIL "A" 0.22 - 0.38 (.009 - .015) TYP 0.13 0.076 (.005 .003)
4.90 0.15 (1.93 .006)
3.2 - 3.45 (.126 - .136)
RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150 Inch)
.045 .005 .050 BSC .189 - .197 (4.801 - 5.004) NOTE 3 .245 MIN .160 .005 .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) .030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN 0- 8 TYP .053 - .069 (1.346 - 1.752) 8 .004 - .010 (0.101 - 0.254) .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 7 6 5
.016 - .050 (0.406 - 1.270)
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.060 .010 (1.524 0.254)
.060 .005 (1.524 0.127) DIA
3
2
1
.140 .010 (3.556 0.127)
.180 .005 (4.572 0.127)
10 NOM .500 (12.70) MIN .050 UNCONTROLLED (1.270) LEAD DIMENSION MAX
.050 (1.27) BSC
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
0.254 (.010)
DETAIL "A" 0 - 6 TYP 3.00 0.102 (.118 .004) (NOTE 3)
1.10 (.043) MAX
0.86 (.034) REF
8
7 65
0.52 (.206) REF
3.00 0.102 (.118 .004) NOTE 4
0.65 (.0256) BSC
1 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
23
4
MSOP (MS8) 0802
(Reference LTC DWG # 05-08-1610)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
1
2
3
4
SO8 0303
Z Package 3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410)
.180 .005 (4.572 0.127)
.90 (2.286) NOM
5 NOM
.016 .003 (0.406 0.076)
.015 .002 (0.381 0.051)
.098 +.016/-.04 (2.5 +0.4/-0.1) 2 PLCS
Z3 (TO-92) 0801
TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION
1634FB
11
LT1634
TYPICAL APPLICATIONS
Single Cell Li-Ion Battery Supervisory Circuit (IQ = 20A)
OFF VBAT 1.75V RS 51k 5% CHARGER SW T0 LOAD
+
A1 1/4 LT1496
-
R1 500k 0.1%
1.25V R2 1.25M 0.1%
-
R4 1.25M 0.1%
LT1634-1.25
D1, D2: 1N458 R1 TO R4: CAR6 SERIES IRC (512) 992-7900
Micropower Voltage and Current Reference
R3 249k 0.1% ZTX214C 1/2 LT1495 R1 TO R3: MAR5 SERIES, IRC (512) 992-7900
IOUT = 1A
RELATED PARTS
PART NUMBER LTC1440 LT1460 LT1495 LTC1540 DESCRIPTION Micropower Comparator with Reference Micropower Series Reference 1.5A Precision Rail-to-Rail Dual Op Amp Nanopower Comparator with Reference COMMENTS 3.7A Max Supply Current, 1% 1.182V Reference, MSOP, PDIP and SO-8 Packages 0.075% Max, 10ppm/C Max Drift, 2.5V, 5V and 10V Versions, MSOP, PDIP, SO-8, SOT-23 and TO-92 Packages 1.5A Max Supply Current, 100pA Max IOS 600nA Max Supply Current, 2% 1.182V Reference, MSOP and SO-8 Packages
1634FB
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
www.linear.com
-
2 AAA ALKALINE CELLS
R4 24k 5%
+
1/2 LT1495
-
LT1634 1.25V
COM
VOUT = 1.5V
+
-
+
+
-
U
A2 1/4 LT1496
RH1 10M 5% D1 RH2 10M 5% D2
R3 1.75M 0.1%
RSW 1M 5% BATTERY
A
VBAT
+
A3 1/4 LT1496
A4 1/4 LT1496
1634 TA05
R1 200k 0.1% R2 1M 0.1%
1634 TA06
LT/TP 0603 1K REV B * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1998

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