Datasheet
LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
36
3554123fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2009
LT 0812 REV E • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC3455 Dual DC/DC Converter with USB Power
Manager and Li-Ion Battery Charger
Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall
Adapter, 4mm × 4mm QFN-24 Package
LTC3456 2-Cell, Multioutput DC/DC Converter with
USB Power Manager
Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources,
4mm × 4mm QFN-24 Package
LTC3557 USB Power Manager with Li-Ion Charger,
Triple Step-Down DC/DC Regulators
Triple Step-Down Switching Regulators (600mA, 400mA); 4mm × 4mm QFN Package
LTC3559 USB Charger with Dual Buck Regulators
Adjustable, Synchronous Buck Converters, 3mm × 3mm QFN-16 Package
LTC4080 500mA Standalone Charger with 300mA
Synchronous Buck
Charges Single-Cell Li-Ion Batteries, Timer Termination + C/10, Thermal Regulation, Buck
Output: 0.8V to V
BAT
, Buck Input V
IN
: 2.7V to 5.5V, 3mm × 3mm DFN-10 Package
LTC3553 µPower PMIC/Charger/Buck/LDO
3mm × 3mm × 0.75mm QFN-20 Package
TYPICAL APPLICATION
V
BUS
NTC
PROG
HPWR
SUSP
PWR_ON1
FSEL
STBY
PGOOD
PWR_ON2
PBSTAT
ON
V
OUT
CHRG
BAT
BVIN
SW1
FB1
SW2
FB2
GND
Li-Ion
BATTERY
C1
10µF
R3
R1
100k
20
16
1
19
9
2
10
4
8
3
5
PB1
7
11
6
13
12
17
18
1415
R
PROG
1.87k
T
C3
10pF
C4
10µF
C2
2.2µF
R
UP1
R
UP2
2.05M
R
LO1
649k
3.3V
LDO
1.8V
L1 4.7µH
C5
10pF
C6
10µF
332k
R
LO2
649k
1.2V
L2
10µH
SYSTEM LOAD
4.35V TO 5.5V
USB INPUT
LTC3554
I/O
CORE
PBSTAT
PWR_ON2
PGOOD
STBY
FSEL
PWR_ON1
SUSP
HPWR
3554 F15
µC
MEMORY
EN
R2
100k
R2
100k
R3
100k
+
C7
10µF
Figure 15. USB PowerPath with LI-Ion Battery (NTC Qualified Charging)