LTC3553_15 Datasheet, PDF (36/36 Pages) Linear Technology – Micropower USB Power Manager With Li-Ion Charger, LDO and Buck Regulator

LTC3553
Typical Application
USB PowerPath With Li-Ion Battery (NTC Qualified Charging),
and LDO Regulator Driven by Buck Regulator
4.35V TO 5.5V
USB INPUT
R1
100k
R2
100k
20
C7
10µF
15
V_BUS
NTC
V_OUT ¹⁸
CHRG ¹⁴
T
R_PROG
1.87k
LTC3553
16 _PROG
BAT ¹⁷
1 _HPWR
19 _SUSP
BVIN ¹²
SYSTEM LOAD
C1
10µF
R3
+ _Li-Ion
BATTERY
C2
2.2µF
LDO
EN
7 _{BUCK_ON}
2 _SEQ
6 _STBY
5 _{LDO_ON}
3 _PBSTAT
PB1 ^{4 ON}
13 ^{L1 4.7µH}
SW
C3
10pF
BUCK_FB ⁸
11
V_INLDO
10
LDO
9
LDO_FB
GND
3.3V
RUP1
2.05M
R_LO1
649k
C5
2.2µF
1.2V
RUP2
332k
R_LO2
649k
C4
10µF
C6
4.7µF
R3
100k
I/O
CORE
µC
1.8V
MEMORY
PBSTAT
LDO_ON
STBY
BUCK_ON
SUSP
HPWR
3553 TA03
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PART
NUMBER DESCRIPTION
COMMENTS
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Triple Step-Down DC/DC Regulators
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
3553fc
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0415 REV C • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009