LTC4412ES6

Manufacturer Part NumberLTC4412ES6
ManufacturerLinear Technology Corporation
LTC4412ES6 datasheet
 


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FEATURES
Very Low Loss Replacement for Power Supply
OR’ing Diodes
Minimal External Components
Automatic Switching Between DC Sources
Simplifies Load Sharing with Multiple Batteries
Low Quiescent Current: 11μA
3V to 28V AC/DC Adapter Voltage Range
2.5V to 28V Battery Voltage Range
Reverse Battery Protection
Drives Almost Any Size MOSFET for Wide Range of
Current Requirements
MOSFET Gate Protection Clamp
Manual Control Input
TM
Low Profile (1mm) ThinSOT
Package
U
APPLICATIO S
Cellular Phones
Notebook and Handheld Computers
Digital Cameras
USB-Powered Peripherals
Uninterruptable Power Supplies
Logic Controlled Power Switch
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PowerPath and ThinSOT are trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
1N5819
WALL
ADAPTER
INPUT
FDN306P
BATTERY
CELL(S)
LTC4412
1
6
V
SENSE
IN
2
5
GND
GATE
3
4
CTL
STAT
Figure 1. Automatic Switchover of Load Between a Battery and a Wall Adapter
Low Loss PowerPath
Controller in ThinSOT
DESCRIPTIO
®
The LTC
4412 controls an external P-channel MOSFET to
create a near ideal diode function for power switchover or
load sharing. This permits highly efficient OR’ing of mul-
tiple power sources for extended battery life and low self-
heating. When conducting, the voltage drop across the
MOSFET is typically 20mV. For applications with a wall
adapter or other auxiliary power source, the load is auto-
matically disconnected from the battery when the auxiliary
source is connected. Two or more LTC4412s may be
interconnected to allow load sharing between multiple
batteries or charging of multiple batteries from a single
charger.
The wide supply operating range supports operation from
one to six Li-Ion cells in series. The low quiescent current
(11μA typical) is independent of the load current. The gate
driver includes an internal voltage clamp for MOSFET
protection.
The STAT pin can be used to enable an auxiliary P-channel
MOSFET power switch when an auxiliary supply is
detected. This pin may also be used to indicate to a
microcontroller that an auxiliary supply is connected. The
control (CTL) input enables the user to force the primary
MOSFET off and the STAT pin low.
The LTC4412 is available in a low profile (1mm) ThinSOT
package.
1
TO LOAD
C
OUT
V
CC
470k
STATUS OUTPUT
LOW WHEN WALL
4412 F01
ADAPTER PRESENT
0
0.02
LTC4412
TM
U
LTC4412 vs Schottky Diode
Forward Voltage Drop
CONSTANT
R
ON
LTC4412
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
0.5
FORWARD VOLTAGE (V)
4412 F01b
4412fa
1

LTC4412ES6 Summary of contents