LT1491ACSPBF

Manufacturer Part NumberLT1491ACSPBF
DescriptionSOP14
ManufacturerLinear Technology Corporation
LT1491ACSPBF datasheets
 

Specifications of LT1491ACSPBF

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FEATURES
n
Low Input Offset Voltage: 500μV Max
n
Output Swings to 10mV Max from V
n
Rail-to-Rail Input and Output
n
Micropower: 50μA/Amplifier Max
n
Over-The-Top
®
Input Common Mode Range Extends
44V Above V
, Independent of V
n
Specified on 3V, 5V and ±15V Supplies
n
High Output Current: 20mA
n
Output Drives 10,000pF with Output Compensation
n
Reverse Battery Protection to 18V
n
No Supply Sequencing Problems
n
High Voltage Gain: 1500V/mV
n
High CMRR: 98dB
n
No Phase Reversal
n
Gain Bandwidth Product: 200kHz
Tiny 3mm × 3mm × 0.8mm DFN Package
n
APPLICATIONS
n
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
n
Supply Current Sensing
n
Battery Monitoring
n
Micropower Active Filters
n
4mA to 20mA Transmitters
TYPICAL APPLICATION
CHARGER
VOLTAGE
LOAD
I
BATT
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
DESCRIPTION
®
The LT
1490A/LT1491A are dual and quad op amps with a
low input offset voltage of 500μV max. The LT1490A/LT1491A
operate on all single and split supplies with a total voltage of
2V to 44V, drawing only 40μA of quiescent current per ampli-
fier. These amplifiers are reverse supply protected; they draw
+
virtually no current for reverse supply up to 18V. The input
range of the LT1490A/LT1491A includes both supplies and
the output swings to both supplies. Unlike most micropower
op amps, the LT1490A/LT1491A can drive heavy loads; their
rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are
unity-gain stable and drive all capacitive loads up to 10,000pF
when optional 0.22μF and 150Ω compensation is used.
The LT1490A/LT1491A have a unique input stage that oper-
ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up to
15V. There is no phase reversal of the output for inputs 15V
below V
The LT1490A dual op amp is available in the 8-pin MSOP , PDIP
and SO packages. For space limited applications LT1490A is
available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless
package (DFN). The quad LT1491A is available in the 14-pin
SO, PDIP and 5mm × 3mm × 0.8mm DFN packages.
L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5825228.
Battery Monitor
R
R A
S
0.2Ω
2k
Q1
+
2N3904
R
I
´
A
1/4 LT1491A
BATT
2k
R
B
Q2
2k
+
2N3904
R
´
B
1/4 LT1491A
2k
+
R
G
10k
V
= 12V
BATT
S1
10k
V
V
OUT
OUT
S1 = OPEN, GAIN = 1
=
=
AMPS
(R
)(R
/R
)(GAIN)
GAIN
S1 = CLOSED, GAIN = 10
S
G
A
LT1490A/LT1491A
+
or 44V above V
, independent of V
.
1/4 LT1491A
LOGIC
+
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
1/4 LT1491A
V
OUT
90.9k
1490A TA01
R
= R
A
B
V
= 5V, 0V
S
14901afd
1