LTC3555 Datasheet, PDF (32/32 Pages) Linear Technology – High Effi ciency USB Power Manager + Triple Step-Down DC/DC

LTC3555/LTC3555-X
TYPICAL APPLICATION
Push Button Start with Automatic Sequencing, Reverse Input Voltage Protection and 10 Second Push and Hold Hard Shutdown
USB
CONNECTOR
4.7k
MN1
MP1
1k
1M
25
V_BUS
SW1 ¹⁷
FB1 ¹⁹
8 _DVCC
0.1μF
1 _LDO3V3
1μF
RST3 ¹⁵
EN2 ⁷
SW3 ¹²
LTC3555/
13
LTC3555-X
FB3
EN3
14
10μF
10k
10μF
27 _ILIM0
28 _ILIM1
I²C ^9,10
EN1 ¹⁶
SW2 ⁶
FB2 ⁴
MN1: 2N7002
MP1: SILICONIX Si2333DS
MEMORY
CORE
SDA
2
SCL
I/O
SEND I²C CODE: “0x12FF04”
ONCE POWER IS DETECTED
3555 TA03
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.
Two High Efficiency DC/DC Converters: Up to 96%. Full Featured Li-Ion Battery Charger with
Accurate USB Current Limiting (500mA/100mA). Pin Selectable Burst Mode Operation. Hot
Swap™ Output for SDIO and Memory Cards. 24-Lead 4mm × 4mm QFN Package
LTC3456
2-Cell, Multi-Output DC/DC
Converter with USB Power
Manager
Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources.
Main Output: Fixed 3.3V Output, Core Output: Adjustable from 0.8V to V_BATT(MIN). Hot Swap
Output for Memory Cards. Power Supply Sequencing: Main and Hot Swap Accurate USB
Current Limiting. High Frequency Operation: 1MHz. High Efficiency: Up to 92%. 24-Lead
4mm × 4mm QFN Package
LTC3552
Standalone Linear Li-Ion Battery Synchronous Buck Converter, Efficiency: >90%, Adjustable Outputs at 800mA and 400mA,
Charger with Adjustable Output Charge Current Programmable up to 950mA, USB Compatible, 16-Lead 5mm × 3mm DFN
Dual Synchronous Buck Converter Package
LTC3557/LTC3557-1
USB Power Manager with
Li-Ion/Polymer Charger, Triple
Synchronous Buck Converter plus
LDO
Complete Multi Function PMIC: Linear Power Manager and Three Buck Regulators Charge
Current Programmable up to 1.5A from Wall Adapter Input, Thermal Regulation Synchronous
Buck Converters Efficiency: >95%, ADJ Outputs: 0.8V to 3.6V at 400mA/400mA/600mA Bat-
Track™ Adaptive Output Control, 200mΩ Ideal Diode, 4mm × 4mm QFN-28 Package.
LTC4085
USB Power Manager with Ideal
Charges Single Cell Li-Ion Batteries Directly from a USB Port, Thermal Regulation, 200mΩ
Diode Controller and Li-Ion Charger Ideal Diode with <50mΩ option, 4mm × 3mm DFN14 Package
LTC4088/LTC4088-1/ High Efficiency USB Power Manager Maximizes Available Power from USB Port, Bat-Track, “Instant On” Operation, 1.5A Max
LTC4088-2
and Battery Charger
Charge Current, 180mΩ Ideal Diode with <50mΩ Option, 3.3V/25mA Always-On LDO,
4mm × 3mm DFN14 Package
Hot Swap and Bat-Track are trademarks of Linear Technology Corporation.
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3555fd
LT 0708 REV D • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007