LTC4412HVIS6

Manufacturer Part NumberLTC4412HVIS6
ManufacturerLinear Technology Corporation
LTC4412HVIS6 datasheet
 


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FEATURES
Very Low Loss Replacement for Power Supply
OR’ing Diodes
3V to 36V AC/DC Adapter Voltage Range
–40 C to 125 C Operating Temperature Range
Minimal External Components
Automatic Switching Between DC Sources
Simplifies Load Sharing with Multiple Batteries
Low Quiescent Current: 11 A
2.5V to 36V Battery Voltage Range
Reverse Battery Protection
Drives Almost Any Size MOSFET for Wide Range of
Current Requirements
MOSFET Gate Protection Clamp
Manual Control Input
Low Profile (1mm) SOT-23 (ThinSOT
U
APPLICATIO S
Industrial and Automotive Applications
Notebook and Handheld Computers
USB-Powered Peripherals
Uninterruptable Power Supplies
Logic Controlled Power Switch
, LTC and LT 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)
LTC4412HV
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
36V, Low Loss PowerPath
Controller in ThinSOT
DESCRIPTIO
®
The LTC
4412HV 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 LTC4412HVs may be in-
terconnected to allow load sharing between multiple bat-
teries or charging of multiple batteries from a single charger.
The LTC4412HV is an extended supply and temperature
range version of the LTC4412.
The wide supply operating range supports operation from
TM
) Package
one to eight Li-Ion cells in series. The low quiescent
current (11 A 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 micro-
controller that an auxiliary supply is connected. The con-
trol (CTL) input enables the user to force the primary
MOSFET off and the STAT pin low.
The LTC4412HV is available in a low profile (1mm) SOT-23
package.
LTC4412HV vs Schottky Diode Forward Voltage Drop
TO LOAD
C
OUT
V
CC
470k
STATUS OUTPUT
LOW WHEN WALL
4412HV F01
ADAPTER PRESENT
LTC4412HV
U
1
CONSTANT
R
ON
LTC4412HV
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
0
0.02
0.5
FORWARD VOLTAGE (V)
4412HV F01b
sn4412hv 4412hvfs
TM
1

LTC4412HVIS6 Summary of contents