LT1635IS8#TR [Linear]
LT1635 - Micropower Rail-to-Rail Op Amp and Reference; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;
| 型号： | LT1635IS8#TR |
| 厂家： | 
Linear |
| 描述： | LT1635 - Micropower Rail-to-Rail Op Amp and Reference; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 运算放大器 光电二极管 |
| 文件： | 总12页 (文件大小：310K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1635
Micropower Rail-to-Rail
Op Amp and Reference
U
FEATURES
DESCRIPTION
The LT®1635 is a new analog building block that includes a
rail-to-railoutputopamp,aprecisionreferenceandreference
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.
■
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
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
thenegativesupply. Therail-to-railoutputstagecanswingto
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 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.
U
APPLICATIONS
■
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
■
Precision Current Regulators
■
Precision Voltage Regulators
Battery Level Indicator
Thermocouple Transmitter
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.
U
TYPICAL APPLICATION
0V to 5V Regulator
Typical Distribution of Input Offset Voltage
C1
0.01µF
25
V
= 5V, 0V
= 25°C
S
A
T
20
15
V
IN
> 5.2V
R1
100k
–
+
7
LT1635
2
3
10
5
6
V
OUT
0V TO 5V
4
8
R2
3.9k
1
0
R3
5k
V
–1.0
–0.6
–0.2
0.2
0.6
1.0
OUT
ADJ
INPUT OFFSET VOLTAGE (mV)
1635 TA01
1635 TA02
1
LT1635
W W U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
Total Supply Voltage (V+ to V–) .............................. 14V
Input Differential Voltage ......................................... 14V
Input Current ...................................................... ±25mA
Output Short-Circuit Duration .......................Continuous
Operating Temperature Range
ORDER PART
TOP VIEW
NUMBER
–
1
2
3
4
REFOUT
OP AMP IN (–)
OP AMP IN (+)
8
7
6
5
REF FB
LT1635CN8
LT1635CS8
LT1635IN8
LT1635IS8
+
+
V
–
+
OP AMP OUT
BALANCE
+
(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
–
V
N8 PACKAGE
S8 PACKAGE
S8 PART
MARKING
8-LEAD PDIP 8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
1635 1635I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
5V OP AMP: VS = 5V, 0V; VCM = VOUT = 2.5V, TA = 25°C, unless otherwise noted. (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
0.3
0.5
1.3
1.6
1.8
mV
mV
mV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift
–40°C ≤ T ≤ 85°C (Note 3)
●
3.0
7.0
µV/°C
A
V
ADJ
Offset Voltage Adjust Range
Positive Adjust
Negative Adjust
●
●
6
–1.4
8
–2
mV
mV
OS
I
I
Input Offset Current
Input Bias Current
●
0.2
0.6
nA
OS
2.0
2.5
4.0
5.0
nA
nA
B
●
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
1
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.05
n
R
Differential
Common Mode, V = 0V to 4V
●
●
●
7
0
25
6
MΩ
GΩ
IN
CM
Input Voltage Range
4
V
CMRR
A
Common Mode Rejection Ratio
V
= 0V to 4V
92
85
110
97
dB
dB
CM
Large-Signal Voltage Gain
Shunt Gain
V = 200mV to 4.5V, No Load
●
●
●
100
45
35
450
200
150
V/mV
V/mV
V/mV
VOL
O
V = 200mV to 4.5V, R = 1.1k
O
L
V = 200mV to 4.5V, R = 500Ω
O
L
I
= 0.1mA to 5mA
V/mV
V/mV
V/mV
OUT
V = 1.5V to 6.45V
15
8
25
20
O
(Note 4)
●
V
Output Voltage Swing Low
Output Voltage Swing High
V = 5V, No Load
●
●
●
2
125
200
10
250
500
mV
mV
mV
OL
S
V = 5V, I
V = 5V, I
S
= 5mA
= 10mA
S
SINK
SINK
V
V = 5V, No Load
●
●
●
4.975
4.65
4.55
4.985
4.8
4.75
V
V
V
OH
S
V = 5V, I
= 5mA
= 10mA
S
SOURCE
SOURCE
V = 5V, I
S
2
LT1635
ELECTRICAL CHARACTERISTICS
5V OP AMP: VS = 5V, 0V; VCM = VOUT = 2.5V, TA = 25°C, unless otherwise noted. (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Short-Circuit Current
V = 5V, Short to GND
●
●
25
25
40
40
mA
mA
SC
S
V = 5V, Short to V
S
CC
PSRR
Power Supply Rejection Ratio
V = 1.2V to 12V, V = V = 0.2V
93
90
100
97
dB
dB
S
CM
O
●
●
Minimum Operating Supply Voltage
Supply Current
(Note 2)
1.1
1.2
V
I
130
150
200
260
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
175
kHz
A = –1, R =
V
∞
0.045
V/µs
L
5V REFERENCE: VS = 5V, 0V; TA = 25°C, unless otherwise noted. (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Feedback Sense Voltage
Voltage at Pin 1 with Pin 1 Connected
to Pin 8 (Note 5)
●
●
●
189
200
211
mV
REF
TC V
Reference Drift
(Note 3)
30
100
ppm/°C
REF
Feedback Current
Current into Pin 8
3.5
5.0
10
15
nA
nA
Line Regulation
0 ≤ I ≤ 1mA, V = 200mV
REF REF
V = 1.2V to 5V
20
30
35
55
ppm/V
ppm/V
S
V = 1.3V to 5V (Note 2)
S
●
●
●
Load Regulation
I
= 0 to 1mA
150
200
300
500
ppm/mA
ppm/mA
REF
Reference Amplifier Gain
V = 0.2V to 3.5V
O
45
25
90
50
V/mV
V/mV
±5V OP AMP: VS = ±5V; VCM = VOUT = 0V, TA = 25°C, unless otherwise noted. (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
0.3
0.5
1.5
1.9
2.1
mV
mV
mV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift
0°C ≤ T ≤ 85°C (Note 3)
●
4.5
10.0
µV/°C
A
V
OS
ADJ
Offset Voltage Adjust Range
Positive Adjust
Negative Adjust
●
●
6
–1.4
8
–2
mV
mV
I
I
Input Offset Current
Input Bias Current
●
0.2
0.6
nA
OS
2.0
2.5
4
5
nA
nA
B
●
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
1
µV
P-P
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
nV/√Hz
pA/√Hz
i
n
f = 1kHz
0.05
R
IN
Differential
Common Mode, V = –5V to 4V
●
●
●
7
35
9
MΩ
GΩ
CM
Input Voltage Range
–5
4
V
CMRR
Common Mode Rejection Ratio
V
CM
= –5V to 4V
94
91
115
110
dB
dB
3
LT1635
ELECTRICAL CHARACTERISTICS
±5V OP AMP: VS = ±5V; VCM = VOUT = 0V, TA = 25°C, unless otherwise noted. (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
A
V
Large-Signal Voltage Gain
V = –4.5V to 4.5V, No Load
●
●
●
175
15
300
100
60
V/mV
V/mV
V/mV
VOL
O
V = –4.5V to 4.5V, R = 1.1k
O
L
V = –4.5V to 4.5V, R = 500Ω
10
O
L
Output Voltage Swing
V = ±5V, No Load
●
●
●
±4.975 ±4.985
±4.65
±4.5
mV
mV
mV
O
S
V = ±5V, I
= 5mA
= 10mA
±4.75
±4.6
S
SINK
SINK
V = ±5V, I
S
I
Short-Circuit Current
V = ±5V
S
±25
±40
mA
SC
PSRR
Power Supply Rejection Ratio
V = ±1V to ±6V, V = V = 0V
90
88
100
98
dB
dB
S
CM
O
●
●
I
Supply Current
135
160
215
280
µA
µA
S
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
175
kHz
A = –1, R =
V
∞
0.05
V/µs
L
±5V REFERENCE: VS = ±5V, TA = 25°C, unless otherwise noted. (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Feedback Sense Voltage
Voltage at Pin 1 with Pin 1 Connected
to Pin 8 (Note 5)
●
●
●
189
200
211
mV
REF
TC V
Reference Drift
(Note 3)
40
120
ppm/°C
REF
Feedback Current
Current into Pin 8
3.5
5.0
10
15
nA
nA
Line Regulation
0 ≤ I ≤ 1mA, V = 200mV
REF REF
V = ±0.6V to ±5V
20
30
25
55
ppm/V
ppm/V
S
V = ±0.65V to ±5V (Note 2)
S
●
●
●
Load Regulation
I
= 0 to 1mA
150
200
300
500
ppm/mA
ppm/mA
REF
Reference Amplifier Gain
V = 0.2V to 8.5V
45
25
90
50
V/mV
V/mV
O
V = 10V, 0V
S
Note 3: This parameter is not 100% tested. Temperature coefficient is
measured by dividing the change in output voltage by specified
temperature range.
The
range.
● denotes specifications that apply over the full operating temperature
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 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.
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
LT1635
U W
Op Amp
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias and Offset Currents
vs Temperature
Input Bias Current
vs Common Mode Voltage
Supply Current vs Supply Voltage
100
50
0
0
–1
–2
–3
–4
–5
220
200
180
160
140
120
100
80
V
= 5V, 0V
V
= 5V, 0V
S
S
I
OS
T
= –55°C
A
T
T
= 125°C
= 25°C
A
A
T
A
T
= –55°C
= 25°C
A
–1
–2
–3
I
B
T
= 125°C
A
60
6
7
2
3
4
5
8
9
10
50
75 100
TEMPERATURE (°C)
125
–1
0
1
2
3
4
–50
0
25
–25
SUPPLY VOLTAGE (V)
COMMON MODE VOLTAGE (V)
1635 G01
1635 G03
1635 G02
Noise Voltage Density
vs Frequency
0.1Hz to 10Hz Noise Voltage
Input Noise Current vs Frequency
0.5
80
70
60
50
40
30
V
T
= ±2.5V
= 25°C
V
T
= ±2.5V
= 25°C
V
T
= ±5V
= 25°C
S
A
S
A
S
A
0.4
0.3
0.2
0.1
0
1
10
100
1000
1
10
100
1000
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (Hz)
FREQUENCY (Hz)
TIME (SEC)
1635 G05
1635 G06
1635 G04
Turn-On Drift
of Three Typical Units
Typical Distribution of Offset
Voltage Drift with Temperature
Minimum Supply Voltage
25
20
15
10
200
0
140
120
V
= 5V, 0V
S
100
–200
–400
–600
–800
–1000
80
60
40
20
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
5
0
V
= ±5V
= 25°C
S
A
T
0
–6
–2
0
2
4
6
0
1
2
–4
0
3
5
6
7
8
9
10
1
2
4
TOTAL SUPPLY VOLTAGE (V)
TCV (µV/°C)
TIME AFTER POWER ON (MINUTES)
OS
1635 G07
1635 G08
1635 G09
5
LT1635
TYPICAL PERFORMANCE CHARACTERISTICS
U W
Op Amp
Voltage Gain vs Frequency
Gain Phase vs Frequency
Capacitive Load Handling
60
50
40
30
20
10
0
120
100
60
50
100
120
140
160
180
200
220
V
= ±5V
V
A
= ±2.5V
= 25°C
V
T
= ±2.5V
= 25°C
S
L
S
S
A
R
T
= ∞
T
= 25°C
A
PHASE
MARGIN
70°
A
A
= 5
40
V
PHASE
80
30
= 10
A = 1
V
V
60
40
20
0
20
10
0
GAIN
–10
–20
–30
240
260
–20
280
1
10 100 1k
1M
10k 100k
10
100
1000
10
100
1000
10000
0.01 0.1
FREQUENCY (kHz)
CAPACITIVE LOAD (pF)
FREQUENCY (Hz)
1635 G11
1635 G12
1635 G10
Gain-Bandwidth Product and
Phase Margin vs Temperature
Voltage Gain vs Load Resistance
Slew Rate vs Temperature
350
300
250
200
150
100
75
70
65
60
55
1M
0.10
0.09
0.08
0.07
V
= 5V, 0V
V
= ±2.5V
S
V
= ±5V
S
S
PHASE MARGIN
T
A
= –55°C
FALLING
SLEW RATE
T
A
= 25°C
0.06
0.05
0.04
RISING
SLEW RATE
GAIN-BANDWIDTH
PRODUCT
T
= 125°C
A
100k
50
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
50
75
125
–50 –25
0
25
75
100
0.1
1
10
100
1000
TEMPERATURE (°C)
LOAD RESISTANCE TO GROUND (kΩ)
1635 G15
1635 G13
1635 G14
Large-Signal Transient Response
VS = ±5V
Large-Signal Transient Response
VS = 5V, 0V
Shunt Gain
0.5
0.4
0.3
0.2
0.1
0
T
A
= 25°C
I
I
= 20mA
OUT
0V
+
+
–
0V
V
V
OUT
IN
I
OUT
–
1635 G17
1635 G18
100µs/DIV
200µs/DIV
= 1mA
OUT
A
V = 1, NO LOAD
A
V = 1, NO LOAD
INPUT 8VP-P
INPUT PULSE 0V TO 4V
0
4
6
7
1
2
3
5
8
OUTPUT VOLTAGE (V)
1635 G16
6
LT1635
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Op Amp
Output Saturation Voltage
vs Input Overdrive
Output Saturation Voltage
Output Saturation Voltage
vs Load Current (Output High)
vs Load Current (Output Low)
1
1000
100
10
16
14
12
10
V
V
= ±2.5V
OD
V
T
= ±2.5V, NO LOAD
= 25°C
V
V
= ±2.5V
S
= 30mV
OD
S
S
A
= 30mV
OUTPUT HIGH
T
= 25°C
A
T
A
= 25°C
T
= 125°C
A
T
= 125°C
A
0.1
8
6
T
= –55°C
A
4
2
0
T
= –55°C
A
OUTPUT LOW
0.01
0.001
1
5
10
20
0.01
0.1
1
10
0
25
30
15
0.001
0.01
0.1
1
10
SOURCING LOAD CURRENT (mA)
INPUT OVERDRIVE (mV)
SINKING LOAD CURRENT (mA)
1635 G21
1635 G20
1635 G19
Common Mode Range
vs Temperature
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
+
V
120
100
120
100
80
60
40
20
0
V
= ±2.5V
= 25°C
V
= ±2.5V
= 25°C
S
A
S
A
T
T
+
V
– 0.5
+
POSITIVE
SUPPLY
V
– 1
80
60
NEGATIVE
SUPPLY
–
V
40
20
0
–
V
– 0.5
–
V
– 1
50
TEMPERATURE (°C)
100 125
1
10
100
1k
10k
100k
0.1
10
100
1k
10k 100k
–50 –25
0
25
75
1
FREQUENCY (Hz)
FREQUENCY (Hz)
1635 G24
1635 G22
1635 G23
Small-Signal Transient Response
VS = ±5V
Small-Signal Transient Response
VS = 5V, 0V
Output Impedance vs Frequency
10000
1000
100
10
V
= ±2.5V
= 25°C
S
A
T
A
V
= 100
A
V
= 10
A = 1
V
0V
1635 G26
1635 G27
50µs/DIV
50µs/DIV
A
V = 1
A
C
V = 1
C
L = 15pF
L = 15pF
1
0.1
1
10
FREQUENCY (kHz)
100
1000
INPUT 50mV TO 100mV
1635 G25
7
LT1635
U W
Reference
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Distribution
Load Regulation
Line Regulation
of Initial Accuracy
208
200
0
20
18
V
T
= 5V, 0V
= 25°C
V
= 5V, 0V
V
T
= 5V, 0V
= 25°C
S
S
S
A
A
207
206
16
14
12
T
= –55°C
= 125°C
T
= 25°C
A
A
205
204
203
202
201
–200
–400
–600
10
8
T
A
6
4
2
0
200
2
4
8
10
12
14
2
0
6
0
1
3
4
194
196
200
202
204
206
198
SUPPLY VOLTAGE (V)
SOURCING CURRENT (mA)
REFERENCE VOLTAGE (mV)
1635 G29
1635 G30
1635 G28
Reference Output vs Temperature
of Two Typical Units
Output Saturation
Reference Amplifier Gain
vs Load Current (Sourcing)
205
204
203
202
201
120
1.5
1.4
V
S
= 5V, 0V
V
T
= 5V, 0V
= 25°C
S
A
V
S
= ±5V
100
80
1.3
1.2
1.1
60
40
T
= –55°C
A
1.0
0.9
T
= 25°C
A
20
0.8
0.7
0.6
0.5
0
T
= 125°C
A
–20
–40
–25
0
25
50
75
125
10
100
10k 100k 1M 10M
–50
100
1
1k
0
2
3
1
TEMPERATURE (°C)
FREQUENCY (Hz)
SOURCING CURRENT (mA)
1635 G31
1635 G33
1635 G32
W
BLOCK DIAGRA
REFERENCE
+
OUTPUT
6
FEEDBACK
V
8
7
BALANCE
5
–
–
2
1
REFERENCE
OUTPUT
INPUTS
OP AMP
+
REF AMP
+
3
+
200mV
REFERENCE
4
1635 BD
–
V
8
LT1635
U
W U U
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 0.1µF), as well as the negative supply pin when
using split supplies.
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
theamplifierfunctionproperlyinthevoltagefollowermode
(Figure 2b).
99R
5V
5V
R
–
–
OUTPUT
SATURATED
≈2mV
Op Amp
LT1635
LT1635
100mV
OP AMP
OP AMP
+
+
1mV
1mV
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 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.
1635 F02
(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
rejectionratiooftheLT1635isverygood, typically110dB.
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.
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
Reference
–
2
3
4
6
ThereferenceoftheLT1635consistsofa200mVprecision
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 ref-
erence amplifier. This configuration offers great flexibility
inthatthereferencevoltagecanbeamplifiedorthereference
amplifier can be used as a comparator. Unlike the op amp,
the output of the reference amplifier can only swing within
0.8V(typ)ofthepositiverail.Toguaranteethatthereference
amplifierdoesnotsaturateovertheindustrialtemperature
range, the minimumoperating supplyshould be 1.3V. The
referenceamplifiercansource2mAofloadcurrentandcan
sink 10µA over the industrial temperature range.
LT1635
+
8
1
5
V
REF
R1
10k
–
V
1635 F01
Figure 1. Standard Offset Adjustment
Output
The output voltage swing of the LT1635 is a function of
inputoverdriveasshowninthetypicalperformancecurves.
When monitoring voltages within 15mV of either rail, gain
9
LT1635
U
TYPICAL APPLICATIONS
Low Voltage Regulator
Best Regulation
V
IN
> 6V
C1
0.01µF
2
3
–
+
7
V
>3.2V
7
R1
28k
IN
6
V
OUT
LT1635
5V
4
8
2
3
–
+
1
6
V
OUT
LT1635
R2
48k
3V
4
R2
2k
8
+
1
R1
2k
OPTIONAL*
1635 TA04
*USE ELECTROLYTIC
OUTPUT CAPACITORS
1635 TA03
2-Terminal Current Regulator
Shunt Regulator
C1*
0.01µF
+
(R2 + R3)V
(R1)(R3)
REF
I
=
OUT
2
3
–
+
7
R2
6
+
R2
R1
LT1635
V
OUT
=
V
REF
1 +
(
)
4
1
2
3
–
7
8
R1
6
LT1635
+
4
R1
R2
R3
1
–
1635 TA05
8
–
*REQUIRED FOR CAPACITIVE LOADING
1635 TA06
Negative Regulator
6V Battery-Level Indicator
GROUND
+
+
C1
47µF
ELECT
R1
R4
R3
R2
49.9k
1%
680k
1.5k
680k
2
3
–
7
6
V
OUT
LT1635
–5V
2
–
+
D1
6
+
4
7
8
LT1635
1
3
Q1
2N3904
4
R2
12k
8
1
R1
2k
1%
–
1635 TA08
V
IN
≤ –5.5V
LED DIMS BELOW 7V
1635 TA07
10
LT1635
W
W
SI PLIFIED SCHEMATICS
Op Amp
+
V
7
Q21
Q28
C2
Q20
6
OUTPUT
R1
6k
Q15
Q1
2
INPUTS
3
R2
6k
Q13
Q19
Q26
Q2
Q27
Q4
Q5
Q7
Q17
Q18
300k
Q3
Q14
Q16
Q24
Q6
Q25
5
BALANCE
–
4
V
+
1635 SSOA
C1
Reference
+
V
7
REF FB
8
1 REFOUT
×16
×1
–
V
4
1635 SSREF
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
4
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.125
0.005
(0.127)
MIN
0.015
(0.380)
MIN
(3.175)
MIN
0.325
2
3
–0.015
+0.635
8.255
N8 0695
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
(
)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1635
TYPICAL APPLICATION
U
1A Shunt Battery Charger (IDARK = 230µA, VFLOAT = 14V)
100nF
1M
3
2A
220Ω
7
+
6
LT1635
OP AMP
1A
SOLAR
ARRAY
+
12V
7V
1
2
LT1635
REF
200mV
5A
–
TIP121
4
GELCEL
8
–
68k
2k
1M
7.5Ω*
10W
*DALE HLM-10
1635 TA09
U
PACKAGE DESCRIPTION
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)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
3
4
2
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LT1178/LT1179 Dual/Quad 17µA Max, Single Supply Precision Op Amps
70µV V Max and 2.5µV/°C Drift Max, 85kHz GBW, 0.04V/µs
Slew Rate, Input/Output Common Mode Includes Ground
OS
LT1490/LT1491 Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps
Single Supply Input Range: –0.4V to 44V, Micropower 50µA
Amplifier, Rail-to-Rail Input and Output, 200kHz GBW
LT2178/LT2179 Dual/Quad 17µA Max, Single Supply Precision Op Amps
SO-8 and 14-Lead Standard Pinout, 70µV V Max, 85kHz GBW
OS
LT1078/LT1079 Dual/Quad Micropower, Single Supply Precision Op Amps
70µV V Max and 0.4µV/°C Drift, 200kHz GBW, 0.07V/µs Slew
Rate, Input/Output Common Mode Includes Ground
OS
LT2078/LT2079 Dual/Quad Micropower, Single Supply Precision Op Amps
SO-8 and 14-Lead Standard Pinout, 70µV V Max, 200kHz GBW
OS
1635f LT/TP 0997 4K • PRINTED IN USA
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
12
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1997
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