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: 11µA
■ 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 (ThinSOTTM) Package
■ AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
■ Industrial and Automotive Applications
■ Notebook and Handheld Computers
■ USB-Powered Peripherals
■ Uninterruptable Power Supplies
■ Logic Controlled Power Switch
All registered trademarks and trademarks are the property of their respective owners.
LTC4412HV
36V, Low Loss PowerPathTM
Controller in ThinSOT
DESCRIPTION
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
multiple 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 automatically disconnected from the battery when the
auxiliary source is connected. Two or more LTC4412HVs
may be interconnected to allow load sharing between
multiple batteries 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
one to eight Li-Ion cells in series. The low quiescent cur-
rent (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 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.
TYPICAL APPLICATION
LTC4412HV vs Schottky Diode Forward Voltage Drop
1
WALL
ADAPTER
INPUT
BATTERY
CELL(S)
1N5819
FDN306P
1 LTC4412HV 6
VIN SENSE
2
5
GND GATE
3
4
CTL STAT
COUT
VCC
TO LOAD
470k STATUS OUTPUT
LOW WHEN WALL
4412HV F01 ADAPTER PRESENT
CONSTANT
RON
LTC4412HV
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
Figure 1. Automatic Switchover of Load Between a Battery and a Wall Adapter
0
0.02
0.5
FORWARD VOLTAGE (V) 4412HV F01b
Rev. B
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