LTC4412HV

Manufacturer Part NumberLTC4412HV
DescriptionLow Loss PowerPath Controller in ThinSOT
ManufacturerLinear Technology
LTC4412HV 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
www.DataSheet4U.com
U
1
CONSTANT
R
ON
LTC4412HV
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
0
0.02
0.5
FORWARD VOLTAGE (V)
4412HV F01b
sn4412hv 4412hvfs
TM
1

LTC4412HV Summary of contents

  • Page 1

    ... 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. ...

  • Page 2

    ... V = 14V SENSE SENSE V – 2.5V V 36V IN SENSE IN V – 2.5V V 36V SENSE IN IN www.DataSheet4U.com U W INFORMATION ORDER PART NUMBER LTC4412HVIS6 TOP VIEW 6 SENSE 5 GATE 4 STAT S6 PART MARKING S6 PACKAGE = 125 C, = 230 C/W LTBHR JA MIN TYP MAX 2 ...

  • Page 3

    ... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC4412HV is guaranteed to meet performance specifications over the – 125 C operating ambient temperature range. Note 3: This results in the same supply current as would be observed with an external P-channel MOSFET connected to the LTC4412HV and operating in forward regulation ...

  • Page 4

    ... LTC4412HV W U TYPICAL PERFOR A CE CHARACTERISTICS V vs Temperature and FR Supply Voltage 2. 28V 36V IN 18 –50 – 100 TEMPERATURE ( C) 4412HV G01 V and SENSE Pin Leakages vs IN Temperature and Supply Voltage 0 I LEAK – 36V VIN ...

  • Page 5

    ... SOURCE A1 0.5V + ON/OFF C1 ANALOG CONTROLLER – GND 2 *DRAIN-SOURCE DIODE OF MOSFET LTC4412HV www.DataSheet4U.com pin with an auxiliary reached. The STAT pin will then go RTO and SENSE pins when an auxiliary power IN pin). This input is usually supplied power from + OUTPUT TO LOAD – LINEAR GATE ...

  • Page 6

    ... The gate clamp voltage below the higher of V G(ON the SENSE voltage pulls SENSE the LTC4412HV will regulate the GATE voltage to maintain a 20mV difference between V and V IN the V of the MOSFET. The system is now in the forward DS regulation mode and the load will be powered from the primary supply ...

  • Page 7

    ... U U APPLICATIO S I FOR ATIO Introduction The system designer will find the LTC4412HV useful in a variety of cost and space sensitive power control applica- tions that include low loss diode OR’ing, fully automatic switchover from a primary to an auxiliary source of power, microcontroller controlled switchover from a primary to ...

  • Page 8

    ... Internal protection for the LTC4412HV is provided to prevent damaging pin currents and excessive internal self heating during a fault condition. These fault conditions can be a result of any LTC4412HV pins shorted to ground power source that is within the pin’s absolute maximum + 20mV (V ), the ...

  • Page 9

    ... Should the wall adapter input be applied, the Schottky diode will pull up the SENSE pin, connected to the load, above the battery voltage and the LTC4412HV will turn the MOSFET off. The STAT pin will then sink current indicating an auxiliary input is connected. The battery is now supplying no load current and all the load current flows through the Schottky diode ...

  • Page 10

    ... LTC4412HV through the CTL input. Back- to-back MOSFETs are used so that the drain-source diode will not power the load when the MOSFET is turned off (dual MOSFETs in one package are commercially available) ...

  • Page 11

    ... Because the SENSE pin is grounded, the LTC4412HV will apply maximum clamped gate drive voltage to the MOSFET. When the CTL pin is a logical high, the LTC4412HV will turn off the MOSFET by pulling its gate voltage up to the supply input voltage and thus deny power to the load. The MOSFET is connected with its source connected to the power source ...

  • Page 12

    ... LTC4412HV PACKAGE DESCRIPTIO 0.62 0.95 MAX REF 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.20 BSC DATUM ‘A’ 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6 ...