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LTC4412HV Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC4412HV
Description  36V, Low Loss PowerPath Controller in ThinSOT
Download  12 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC4412HV Datasheet(HTML) 1 Page - Linear Technology

 
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1
LTC4412HV
sn4412hv 4412hvfs
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
36V, Low Loss PowerPath
TM
Controller in ThinSOT
s
Very Low Loss Replacement for Power Supply
OR’ing Diodes
s
3V to 36V AC/DC Adapter Voltage Range
s
–40
°C to 125°C Operating Temperature Range
s
Minimal External Components
s
Automatic Switching Between DC Sources
s
Simplifies Load Sharing with Multiple Batteries
s
Low Quiescent Current: 11
µA
s
2.5V to 36V Battery Voltage Range
s
Reverse Battery Protection
s
Drives Almost Any Size MOSFET for Wide Range of
Current Requirements
s
MOSFET Gate Protection Clamp
s
Manual Control Input
s
Low Profile (1mm) SOT-23 (ThinSOT
TM) Package
s
Industrial and Automotive Applications
s
Notebook and Handheld Computers
s
USB-Powered Peripherals
s
Uninterruptable Power Supplies
s
Logic Controlled Power Switch
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
one to eight Li-Ion cells in series. The low quiescent
current (11
µA 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
PowerPath and ThinSOT are trademarks of Linear Technology Corporation.
VIN
GND
CTL
SENSE
GATE
STAT
1
2
3
6
5
4
LTC4412HV
COUT
TO LOAD
STATUS OUTPUT
LOW WHEN WALL
ADAPTER PRESENT
470k
4412HV F01
VCC
1N5819
FDN306P
BATTERY
CELL(S)
WALL
ADAPTER
INPUT
Figure 1. Automatic Switchover of Load Between a Battery and a Wall Adapter
FORWARD VOLTAGE (V)
0.02
0
1
CONSTANT
RON
4412HV F01b
0.5
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
LTC4412HV
LTC4412HV vs Schottky Diode Forward Voltage Drop


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