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LT1635 Micropower Rail-to-Rail Op Amp and Reference
FEATURES
s s s s s s s s s s s
DESCRIPTION
The LT (R)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 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.
Guaranteed Operation at 1.2V Op Amp and Reference on Single Chip Micropower: 130A 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
APPLICATIONS
s
s s s s
Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Precision Current Regulators Precision Voltage Regulators Battery Level Indicator Thermocouple Transmitter
TYPICAL APPLICATION
0V to 5V Regulator
C1 0.01F VIN > 5.2V
PERCENT OF UNITS
Typical Distribution of Input Offset Voltage
25 VS = 5V, 0V TA = 25C 20
R1 100k
15
R2 3.9k VOUT ADJ
+
3
-
2
7 LT1635 4 8 1 R3 5k
1635 TA01
10
6
VOUT 0V TO 5V
5
0 - 1.0
- 0.6 0.2 0.6 - 0.2 INPUT OFFSET VOLTAGE (mV)
U
U
U
1.0
1635 TA02
1
LT1635
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) .............................................. - 40C to 85C Junction Temperature ........................................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW REFOUT 1 OP AMP IN (-) 2 OP AMP IN (+) 3 V- 4 N8 PACKAGE 8-LEAD PDIP
- + + - +
ORDER PART NUMBER
8 REF FB 7 V+ 6 OP AMP OUT 5 BALANCE
LT1635CN8 LT1635CS8 LT1635IN8 LT1635IS8 S8 PART MARKING 1635 1635I
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
5V OP AMP: VS = 5V, 0V; VCM = VOUT = 2.5V, TA = 25C, unless otherwise noted. (Note 1)
SYMBOL VOS PARAMETER Input Offset Voltage 0C TA 70C - 40C TA 85C Input Offset Voltage Drift VOS ADJ IOS IB Offset Voltage Adjust Range Input Offset Current Input Bias Current
q q q q q q q
CONDITIONS
MIN
TYP 0.3 0.5 3.0
MAX 1.3 1.6 1.8 7.0
UNITS mV mV mV V/C mV mV
- 40C TA 85C (Note 3) Positive Adjust Negative Adjust
6 - 1.4
8 -2 0.2 2.0 2.5 1 50 0.05 0.6 4.0 5.0
Input Noise Voltage en in RIN Input Noise Voltage Density Input Noise Current Density Input Resistance Input Voltage Range CMRR AVOL Common Mode Rejection Ratio Large-Signal Voltage Gain
0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = 0V to 4V VCM = 0V to 4V
q q q
VP-P nV/Hz pA/Hz M G 4 V dB dB V/mV V/mV V/mV V/mV V/mV V/mV 10 250 500 mV mV mV V V V
7 0 92 85 100 45 35 15 8
25 6 110 97 450 200 150 25 20 2 125 200
VO = 200mV to 4.5V, No Load VO = 200mV to 4.5V, RL = 1.1k VO = 200mV to 4.5V, RL = 500 IOUT = 0.1mA to 5mA VO = 1.5V to 6.45V (Note 4) VS = 5V, No Load VS = 5V, ISINK = 5mA VS = 5V, ISINK = 10mA VS = 5V, No Load VS = 5V, ISOURCE = 5mA VS = 5V, ISOURCE = 10mA
q q q
Shunt Gain
q q q q q q q
VOL
Output Voltage Swing Low
VOH
Output Voltage Swing High
4.975 4.65 4.55
4.985 4.8 4.75
2
U
W
U
U
WW
W
nA nA nA
LT1635
ELECTRICAL CHARACTERISTICS
5V OP AMP: VS = 5V, 0V; VCM = VOUT = 2.5V, TA = 25C, unless otherwise noted. (Note 1)
SYMBOL ISC PSRR PARAMETER Short-Circuit Current Power Supply Rejection Ratio Minimum Operating Supply Voltage IS GBW SR Supply Current
q
CONDITIONS VS = 5V, Short to GND VS = 5V, Short to VCC VS = 1.2V to 12V, VCM = VO = 0.2V
q q q
MIN 25 25 93 90
TYP 40 40 100 97 1.1 130 150 175 0.045
MAX
UNITS mA mA dB dB
(Note 2)
q
1.2 200 260
V A A kHz V/s
Gain Bandwidth Product Slew Rate
f = 1kHz AV = - 1, RL =
5V REFERENCE: VS = 5V, 0V; TA = 25C, unless otherwise noted. (Note 1)
SYMBOL VREF TC VREF PARAMETER Feedback Sense Voltage Reference Drift Feedback Current Line Regulation CONDITIONS Voltage at Pin 1 with Pin 1 Connected to Pin 8 (Note 5) (Note 3) Current into Pin 8
q q q
MIN 189
TYP 200 30 3.5 5.0 20 30 150 200
MAX 211 100 10 15 35 55 300 500
UNITS mV ppm/C nA nA ppm/V ppm/V ppm/mA ppm/mA V/mV V/mV
0 IREF 1mA, VREF = 200mV VS = 1.2V to 5V VS = 1.3V to 5V (Note 2) IREF = 0 to 1mA
q q
Load Regulation Reference Amplifier Gain
VO = 0.2V to 3.5V
q
45 25
90 50
5V OP AMP: VS = 5V; VCM = VOUT = 0V, TA = 25C, unless otherwise noted. (Note 1)
SYMBOL VOS PARAMETER Input Offset Voltage 0C TA 70C - 40C TA 85C Input Offset Voltage Drift VOS ADJ IOS IB Offset Voltage Adjust Range Input Offset Current Input Bias Current
q q q q q q q
CONDITIONS
MIN
TYP 0.3 0.5 4.5
MAX 1.5 1.9 2.1 10.0
UNITS mV mV mV V/C mV mV
0C TA 85C (Note 3) Positive Adjust Negative Adjust
6 - 1.4
8 -2 0.2 2.0 2.5 1 50 0.05 0.6 4 5
nA nA nA VP-P nV/Hz pA/Hz M G
Input Noise Voltage en in RIN Input Noise Voltage Density Input Noise Current Density Input Resistance Input Voltage Range CMRR Common Mode Rejection Ratio
0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = - 5V to 4V VCM = - 5V to 4V
q q q
7 -5 94 91
35 9 4 115 110
V dB dB
3
LT1635
ELECTRICAL CHARACTERISTICS
5V OP AMP: VS = 5V; VCM = VOUT = 0V, TA = 25C, unless otherwise noted. (Note 1)
SYMBOL AVOL PARAMETER Large-Signal Voltage Gain CONDITIONS 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 VS = 5V, No Load VS = 5V, ISINK = 5mA VS = 5V, ISINK = 10mA VS = 5V VS = 1V to 6V, VCM = VO = 0V
q q q q q q q
MIN 175 15 10 4.975 4.65 4.5 25 90 88
TYP 300 100 60 4.985 4.75 4.6 40 100 98 135 160 175 0.05
MAX
UNITS V/mV V/mV V/mV mV mV mV mA dB dB
VO
Output Voltage Swing
ISC PSRR IS GBW SR
Short-Circuit Current Power Supply Rejection Ratio Supply Current
q
215 280
A A kHz V/s
Gain Bandwidth Product Slew Rate
f = 1kHz AV = -1, RL =
5V REFERENCE: VS = 5V, TA = 25C, unless otherwise noted. (Note 1)
SYMBOL VREF TC VREF PARAMETER Feedback Sense Voltage Reference Drift Feedback Current Line Regulation CONDITIONS Voltage at Pin 1 with Pin 1 Connected to Pin 8 (Note 5) (Note 3) Current into Pin 8
q q q
MIN 189
TYP 200 40 3.5 5.0 20 30 150 200
MAX 211 120 10 15 25 55 300 500
UNITS mV ppm/C nA nA ppm /V ppm/V ppm/mA ppm/mA V/mV V/mV
0 IREF 1mA, VREF = 200mV VS = 0.6V to 5V VS = 0.65V to 5V (Note 2) IREF = 0 to 1mA
q q
Load Regulation Reference Amplifier Gain
VO = 0.2V to 8.5V VS = 10V, 0V
q
45 25
90 50
The q denotes specifications that apply over the full operating temperature range. Note 1: 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 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.
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 + terminal and input common mode is referred to V -. Note 5: If part is stored outside of the specified temperature range, the output may shift due to hysteresis.
4
LT1635 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
OFFSET CURRENT (pA)
220 200
SUPPLY CURRENT (A)
180 160 140 120 100 80 60 2 3 6 7 4 5 8 SUPPLY VOLTAGE (V) 9 10 TA = 125C TA = 25C
INPUT BIAS CURRENT (nA)
TA = - 55C
BIAS CURRENT (nA)
0.1Hz to 10Hz Noise Voltage
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
VS = 5V TA = 25C
80
INPUT NOISE CURRENT DENSITY (pA/Hz)
NOISE VOLTAGE (1V/DIV)
0
1
2
3
456 TIME (SEC)
7
Typical Distribution of Offset Voltage Drift with Temperature
25 200
CHANGE IN INPUT OFFSET VOLTAGE (V)
VS = 5V, 0V 20
PERCENT OF UNITS
0 - 200 - 400 - 600 - 800 TA = 125C TA = 25C TA = - 55C
CHANGE IN OFFSET VOLTAGE (V)
15
10
5
0
-6
-4
-2 0 2 TCVOS (V/C)
UW
1635 G01
Op Amp Input Bias Current vs Common Mode Voltage
0 VS = 5V, 0V -1 TA = 125C TA = 25C -2 TA = - 55C -3
Input Bias and Offset Currents vs Temperature
100 VS = 5V, 0V 50 IOS
0
-1 IB -2
-4
-3 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
-5 -1
0 2 3 1 COMMON MODE VOLTAGE (V)
4
1635 G03
1635 G02
Noise Voltage Density vs Frequency
VS = 2.5V TA = 25C
Input Noise Current vs Frequency
0.5 VS = 2.5V TA = 25C
70
0.4
60
0.3
50
0.2
40
0.1
30
0
1 10 100 FREQUENCY (Hz) 1000
1635 G05
8
9
10
1
10 100 FREQUENCY (Hz)
1000
1635 G06
1635 G04
Minimum Supply Voltage
140 120 100 80 60 40 20 0
Turn-On Drift of Three Typical Units
-1000 4 6
1635 G07
VS = 5V TA = 25C 0 1 789 456 23 TIME AFTER POWER ON (MINUTES) 10
0
1 TOTAL SUPPLY VOLTAGE (V)
2
1635 G08
1635 G09
5
LT1635 TYPICAL PERFORMANCE CHARACTERISTICS
Voltage Gain vs Frequency
120 100 VS = 2.5V TA = 25C
VOLTAGE GAIN (dB)
VOLTAGE GAIN (dB)
OVERSHOOT (%)
80 60 40 20 0 - 20 0.01 0.1
1
10
100
1k
10k 100k 1M
1635 G10
FREQUENCY (Hz)
Slew Rate vs Temperature
0.10 0.09
SLEW RATE (V/s)
GAIN-BANDWIDTH PRODUCT (kHz)
VOLTAGE GAIN (V/V)
0.08 FALLING SLEW RATE 0.07 0.06 0.05 RISING SLEW RATE
0.04 - 50 - 25
50 25 75 0 TEMPERATURE (C)
Shunt Gain
0.5 TA = 25C
INPUT VOLTAGE CHANGE (mV)
0.4
0.3
+
VIN
2V/DIV
0V
+
0.2
1V/DIV
IOUT = 20mA
-
0.1 IOUT = 1mA 0 0 1 2 6 4 3 5 OUTPUT VOLTAGE (V) 7 8
6
UW
VS = 5V 100
1635 G13
Op Amp Capacitive Load Handling
Gain Phase vs Frequency
60 50 40 30 20 10 0 GAIN - 10 -20 - 30 10 100 FREQUENCY (kHz) 240
10
VS = 2.5V TA = 25C PHASE MARGIN 70 PHASE
100 120
60 50
VS = 5V RL = TA = 25C
140
AV = 5 AV = 10 AV = 1
PHASE SHIFT (DEG)
160 180 200 220
40 30 20
260 280 1000
1635 G11
0 10 100 1000 CAPACITIVE LOAD (pF) 10000
1635 G12
Gain-Bandwidth Product and Phase Margin vs Temperature
350 VS = 2.5V 75
Voltage Gain vs Load Resistance
1M VS = 5V, 0V
300 PHASE MARGIN 250
70
PHASE MARGIN (DEG)
TA = - 55C
65
200 GAIN-BANDWIDTH PRODUCT
60
TA = 25C
150
55
TA = 125C 100k 0.1
125
100 -50
-25
50 0 25 75 TEMPERATURE (C)
100
50 125
1 10 100 1000 LOAD RESISTANCE TO GROUND (k)
1635 G15
1635 G14
Large-Signal Transient Response VS = 5V
Large-Signal Transient Response VS = 5V, 0V
VOUT IOUT
0V
-
200s/DIV AV = 1, NO LOAD INPUT 8VP-P
1635 G17
100s/DIV AV = 1, NO LOAD INPUT PULSE 0V TO 4V
1635 G18
1635 G16
LT1635 TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Voltage vs Input Overdrive
16
OUTPUT SATURATION VOLTAGE (mV)
12 10 8 6 4 2 0 0 5
OUTPUT HIGH
100
TA = 25C TA = 125C
OUTPUT SATURATION VOLTAGE (V)
14
OUTPUT SATURATION VOLTAGE (mV)
VS = 2.5V, NO LOAD TA = 25C
OUTPUT LOW
20 25 15 INPUT OVERDRIVE (mV)
10
Common Mode Range vs Temperature
V+ V + - 0.5 V+ - 1
COMMON MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
COMMON MODE RANGE (V)
V- V - - 0.5 V- - 1 - 50 - 25
50 25 75 0 TEMPERATURE (C)
Output Impedance vs Frequency
10000 VS = 2.5V TA = 25C AV = 100 10mV/DIV
OUTPUT IMPEDANCE ()
1000
AV = 10 100
AV = 1
0V
10 50s/DIV 1 0.1 AV = 1 CL = 15pF
1635 G26
10mV/DIV
1
10 100 FREQUENCY (kHz)
UW
30
1635 G19
Op Amp Output Saturation Voltage vs Load Current (Output High)
1 VS = 2.5V VOD = 30mV
Output Saturation Voltage vs Load Current (Output Low)
1000 VS = 2.5V VOD = 30mV
TA = 25C 0.1 TA = 125C
10
TA = - 55C
TA = - 55C
1 0.001
0.01 0.1 1 SINKING LOAD CURRENT (mA)
10
1635 G20
0.01 0.001
0.01 0.1 1 SOURCING LOAD CURRENT (mA)
10
1635 G21
Common Mode Rejection Ratio vs Frequency
120 100 80 60 40 20 0 100 125 1 10 100 1k FREQUENCY (Hz) 10k 100k
1635 G23
Power Supply Rejection Ratio vs Frequency
120 100 80 NEGATIVE SUPPLY 60 40 20 0 VS = 2.5V TA = 25C POSITIVE SUPPLY
VS = 2.5V TA = 25C
0.1
1
10 100 1k FREQUENCY (Hz)
10k
100k
1635 G24
1635 G22
Small-Signal Transient Response VS = 5V
Small-Signal Transient Response VS = 5V, 0V
50s/DIV AV = 1 CL = 15pF INPUT 50mV TO 100mV
1635 G27
1000
1635 G25
7
LT1635 TYPICAL PERFORMANCE CHARACTERISTICS
Typical Distribution of Initial Accuracy
20 18 16
PERCENT OF UNITS 208
VS = 5V, 0V TA = 25C
REFERENCE OUTPUT (mV)
206 205 204 203 202 201 200 0 2 8 10 6 SUPPLY VOLTAGE (V) 4 12 14
1635 G29
REFERENCE CHANGE (ppm)
14 12 10 8 6 4 2 0 194 204 196 200 202 198 REFERENCE VOLTAGE (mV) 206
Reference Output vs Temperature of Two Typical Units
205 VS = 5V OUTPUT SATURATION VOLTAGE (V)
REFERENCE OUTPUT (mV)
204
TA = - 55C TA = 25C
203
GAIN (dB)
202
201 -50 -25
0
25
50
75
TEMPERATURE (C)
1635 G31
BLOCK DIAGRA
INPUTS 3
OP AMP
200mV REFERENCE
+
4 V-
8
+
-
UW
1635 G28
Reference
Line Regulation
VS = 5V, 0V 207
Load Regulation
200 VS = 5V, 0V TA = 25C
0
TA = - 55C
TA = 25C
- 200
TA = 125C
- 400
- 600
0
2 1 3 SOURCING CURRENT (mA)
4
1635 G30
Output Saturation vs Load Current (Sourcing)
1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0 2 1 SOURCING CURRENT (mA) 3
1635 G32
Reference Amplifier Gain
120 100 80 60 40 20 VS = 5V, 0V TA = 25C
VS = 5V, 0V
TA = 125C
0 - 20 - 40 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M
100
125
1635 G33
+
-
W
OUTPUT 6 BALANCE 5 1 REFERENCE OUTPUT REFERENCE FEEDBACK 8 7 V+ 2 REF AMP
1635 BD
LT1635
APPLICATIONS INFORMATION
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 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 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 occurring when the input is below the negative supply. Protective 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+
LT1635 OP AMP 1mV
100mV 1mV
(a)
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 common mode range, there will be very little common mode induced distortion. Crossover distortion will increase as the output load resistance decreases. For the lowest distortion, the LT1635 should be operated with the output always sourcing current. Reference
Figure 1. Standard Offset Adjustment
Output 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
+
3
-
2
4 6 8 VREF R1 10k V-
LT1635 1 5
1635 F01
The reference of the LT1635 consists of a 200mV precision bandgap and a reference amplifier. As shown in the block diagram, the 0.2V precision bandgap is referred to V - and is internally connected to the noninverting input of the reference 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, 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 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
W
U
U
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 5V R 5V OUTPUT SATURATED 2mV
LT1635 OP AMP
1635 F02
(b)
9
LT1635
TYPICAL APPLICATIONS
Low Voltage Regulator
C1 0.01F
R1 28k
VIN > 3.2V
R2 2k
*USE ELECTROLYTIC OUTPUT CAPACITORS
2-Terminal Current Regulator
+ -
2 7 LT1635 6 4 8 IOUT = (R2 + R3)VREF (R1)(R3)
R1
R2
R3
-
R1
1635 TA05
*REQUIRED FOR CAPACITIVE LOADING
Negative Regulator
GROUND R2 49.9k 1%
6V Battery-Level Indicator
+
R1 680k R3 680k R4 1.5k
+ -
2 7 LT1635 6 4 8 1
C1 47F ELECT VOUT - 5V
R1 2k 1%
VIN - 5.5V
1635 TA07
LED DIMS BELOW 7V
10
+
Q1 2N3904
R2 12k
3
-
+
3
+
3
-
+
3
1
+
3
-
2
7 LT1635 4 8 1 6 VOUT 3V
+
OPTIONAL*
R2 48k R1 2k
1635 TA04
1635 TA03
C1* 0.01F
R2
2
LT1635 4 1 8
+
3
-
U
Best Regulation
VIN > 6V
2
7 LT1635 4 8 1 6 VOUT 5V
Shunt Regulator
+
7 6
VOUT = 1 + R2 VREF R1
()
-
1635 TA06
2
7 LT1635 4 8 1
D1 6
-
1635 TA08
LT1635
SI PLIFIED SCHEMATICS
Op Amp
+ 7V
R1 6k 2 INPUTS 3 R2 6k Q2 Q4 300k 5 BALANCE Q3 Q5 Q6 Q7 Q14 Q1 Q13
C1
V+ 7
V- 4
PACKAGE DESCRIPTION
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.125 (3.175) MIN 0.015 (0.380) MIN
0.018 0.003 0.100 0.010 (0.457 0.076) (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(
+0.025 0.325 -0.015 +0.635 8.255 -0.381
)
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
W
W
Q21 Q28 C2 Q20 Q15 6 OUTPUT
Q19 Q26 Q17 Q16 Q18 Q24 Q25 Q27
4 V-
1635 SSOA
Reference
REF FB 8 x 16 x1 1 REFOUT
1635 SSREF
Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.045 - 0.065 (1.143 - 1.651) 0.130 0.005 (3.302 0.127) 0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1
2
3
4
N8 0695
11
LT1635
TYPICAL APPLICATION
1A Shunt Battery Charger (IDARK = 230A, VFLOAT = 14V)
1A SOLAR ARRAY
200mV 8
*DALE HLM-10
PACKAGE DESCRIPTION
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254)
0.053 - 0.069 (1.346 - 1.752) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270
*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
RELATED PARTS
PART NUMBER LT1178/LT1179 LT1490/LT1491 LT2178/LT2179 LT1078/LT1079 LT2078/LT2079 DESCRIPTION Dual/Quad 17A Max, Single Supply Precision Op Amps Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps Dual/Quad 17A Max, Single Supply Precision Op Amps Dual/Quad Micropower, Single Supply Precision Op Amps Dual/Quad Micropower, Single Supply Precision Op Amps COMMENTS 70V VOS Max and 2.5V/C Drift Max, 85kHz GBW, 0.04V/s Slew Rate, Input/Output Common Mode Includes Ground Single Supply Input Range: - 0.4V to 44V, Micropower 50A Amplifier, Rail-to-Rail Input and Output, 200kHz GBW SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 85kHz GBW 70V VOS Max and 0.4V/C Drift, 200kHz GBW, 0.07V/s Slew Rate, Input/Output Common Mode Includes Ground SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 200kHz GBW
1635f LT/TP 0997 4K * PRINTED IN USA
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507 q TELEX: 499-3977 q www.linear-tech.com
U
U
100nF 1M 2A 3
+ -
7
220 6 TIP121 12V 5A GELCEL
+
LT1635 REF 1
7V
2 68k
LT1635 OP AMP 4
-
1M 7.5* 10W 2k
1635 TA09
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 0.004 - 0.010 (0.101 - 0.254) 8 7 6 5
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
SO8 0695
1
2
3
4
(c) LINEAR TECHNOLOGY CORPORATION 1997

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