LTC3553-2_15 Datasheet, PDF (36/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

LTC3553-2
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
LTC3553-2
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 _PGOOD
6 _STBY
13 ^{L1 4.7μH}
SW
C3
10pF
BUCK_FB ⁸
11
V_INLDO
3 _PBSTAT
PB1 ^{4 ON}
10
LDO
9
LDO_FB
GND
3.3V
RUP1
2.05M
C4
10μF
R_LO1
649k
C5
2.2μF
1.2V
RUP2
332k
C6
4.7μF
R_LO2
649k
R4
100k
I/O
CORE
μC
R3
100k
1.8V
MEMORY
PBSTAT
PGOOD
STBY
BUCK_ON
SUSP
HPWR
35532 TA03
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PART
NUMBER DESCRIPTION
COMMENTS
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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
35532f
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0112 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2012