LTC1473CGN 데이터 시트보기 (PDF) - Linear Technology
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LTC1473CGN Datasheet PDF : 16 Pages
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LTC1473
Dual PowerPathTM
Switch Driver
FEATURES
s Power Path Management for Systems with Multiple
DC Sources
s All N-Channel Switching to Reduce Power Losses and
System Cost
s Switches and Isolates Sources Up to 30V
s Adaptive High Voltage Step-Up Regulator for N-Channel
Gate Drive
s Capacitor Inrush and Short-Circuit Current Limited
s User-Programmable Timer to Limit Switch Dissipation
s Small Footprint: 16-Pin Narrow SSOP
U
APPLICATIO S
s Notebook Computers
s Portable Instruments
s Handi-Terminals
s Portable Medical Equipment
s Portable Industrial Control Equipment
DESCRIPTIO
The LTC®1473 provides a power management solution for
single and dual battery notebook computers and other
portable equipment. The LTC1473 drives two sets of back-
to-back N-channel MOSFET switches to route power to the
input of the main system switching regulator. An internal
boost regulator provides the voltage to fully enhance the
logic level N-channel MOSFET switches.
The LTC1473 senses current to limit surge currents both
into and out of the batteries and the system supply
capacitor during switch-over transitions or during fault
conditions. A user-programmable timer monitors the time
the MOSFET switches are in current limit and latches them
off when the programmed time is exceeded.
A unique “2-diode mode” logic ensures system start-up
regardless of which input receives power first.
, LTC and LT are registered trademarks of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
MBRD340
BAT1
DCIN
CTIMER
4700pF
MMBD2838LTI
1µF
1µF
FROM POWER
MANAGEMENT
µP
1mH*
MMBD914LTI
1
LTC1473
16
IN1
GA1
2
IN2
15
SAB1
3
DIODE
14
GB1
4
TIMER
SENSE+ 13
5 V+
SENSE– 12
6
VGG
11
GA2
7
SW
10
SAB2
8
GND
9
GB2
BAT2
*COILCRAFT 1812LS-105XKBC
Si9926DY
Si9926DY
RSENSE
0.04Ω
COUT
INPUT OF SYSTEM
HIGH EFFICIENCY DC/DC
SWITCHING REGULATOR
(LTC1735, ETC)
1473 TA01
1
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