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LT1579-3 Datasheet

  • LT1579-3

  • 300mA Dual Input Smart Battery Backup Regulator

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LT1579
300mA Dual Input Smart
Battery Backup Regulator
FEATURES
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DESCRIPTION
The LT
廬
1579 is a dual input, single output, low dropout
regulator. This device is designed to provide an
uninterruptible output voltage from two independent input
voltage sources on a priority basis. All of the circuitry
needed to switch smoothly and automatically between
inputs is incorporated.
The LT1579 can supply 300mA of output current from
either input at a dropout voltage of 0.4V. Quiescent current
is 50碌A(chǔ), dropping to 7碌A(chǔ) in shutdown. Two comparators
are included to monitor input voltage status. Two addi-
tional status flags indicate which input is supplying power
and provide an early warning against loss of output
regulation when both inputs are low. A secondary select
pin is provided so that the user can force the device to
switch from the primary input to the secondary input.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting and reverse-
current protection.
The device is available in fixed output voltages of 3V, 3.3V
and 5V, and as an adjustable device with a 1.5V reference
voltage. The LT1579 regulators are available in narrow
16-lead SO and 16-lead SSOP packages with all features,
and in SO-8 with limited features.
Maintains Output Regulation with Dual Inputs
Dropout Voltage: 0.4V
Output Current: 300mA
50碌A(chǔ) Quiescent Current
No Protection Diodes Needed
Two Low-Battery Comparators
Status Flags Aid Power Management
Adjustable Output from 1.5V to 20V
Fixed Output Voltages: 3V, 3.3V and 5V
7碌A(chǔ) Quiescent Current in Shutdown
Reverse-Battery Protection
Reverse Current Protection
Remove, Recharge and Replace Batteries Without
Daisy-Chained Control Outputs
Loss of Regulation
APPLICATIONS
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Dual Battery Systems
Battery Backup Systems
Automatic Power Management for
Battery-Operated Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V Dual Battery Supply
OUTPUT VOLTAGE (V) INPUT VOLTAGE (V)
Automatic Input Switching
+
5V
300mA
4.7碌F
12
10
8
6
4
2
0
5.05
5.00
4.95
0
2
4
6
8 10 12 14 16 18 20
TIME (ms)
1578 TA02
+
1碌F
IN1
2.7M
LBI1
1M
LT1579-5
OUT
V
IN1
I
IN1
SS
+
1碌F
IN2
2.7M
LBI2
1M
SHDN
LBO1
LB02
BACKUP
DROPOUT
BIASCOMP
GND
0.01碌F
1579 TA01
TO
POWER
MANAGEMENT
U
U
U
SWITCHOVER
POINT
V
IN2
= 10V
I
LOAD
= 50mA
80
I
IN2
60
40
20
0
INPUT CURRENT (mA)
1

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