LTC3550 Datasheet, PDF (24/24 Pages) Linear Technology – Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

LTC3550
TYPICAL APPLICATIO
Dual Input Charger Plus Step-Down Converter with Wall Adapter PowerPath^™
USB
POWER
EN
DCIN
LTC3550
RUN
USBIN
V_CC
1µF
IUSB
BAT
IDC
SW
ITERM
V_FB
2.1k 1.24k 1k
GND
1% 1% 1%
1µF
4.7µF
2.2µH
22pF
WALL
ADAPTER
1k
10µF
CER
604k
800mA (WALL)
475mA (USB)
V_OUT
1.8V
600mA
+
4.2V
SINGLE-CELL
Li-Ion BATTERY
PowerPath is a trademark of Linear Technology Corporation
301k
3550 TA04
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PART NUMBER DESCRIPTION
COMMENTS
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Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs with Automatic
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LTC4077
Dual Input Standalone Li-Ion Battery
Charger
Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs with
Automatic Input Power Detection and Selection, 950mA Charger Current, Thermal
Regulation, Programmable USB Low Power Mode, C/10 Charge Termination,
3mm × 3mm DFN Package
ThinSOT is a trademark of Linear Technology Corporation.
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3550fa
LT 0406 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2006