LTC3557 Datasheet, PDF (28/28 Pages) Linear Technology – USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

LTC3557/LTC3557-1
PACKAGE DESCRIPTION
UF Package
28-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1721 Rev A)
0.70 p0.05
4.00 p 0.10
(4 SIDES)
PIN 1
TOP MARK
(NOTE 6)
0.75 p 0.05
R = 0.05
TYP
2.64 p 0.10
(4-SIDES)
BOTTOM VIEW—EXPOSED PAD
R = 0.115
TYP
27 28
PIN 1 NOTCH
R = 0.20 TYP
OR 0.35 s 45o
CHAMFER
0.40 p 0.05
1
2
PACKAGE
OUTLINE
0.20 p0.05
0.40 BSC
0.200 REF
0.00 – 0.05
DED SOLDER PAD PITCH AND DIMENSIONS
R MASK TO AREAS THAT ARE NOT SOLDERED
S NOT A JEDEC PACKAGE OUTLINE
NOT TO SCALE
SIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
(UF28) QFN 0106 REVA
0.20 p 0.05
0.40 BSC
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Power Management
LTC3455
Dual DC/DC Converter with USB Power Management and Efficiency >96%, Accurate USB Current Limiting (500mA/100mA),
Li-Ion Battery Charger
4mm × 4mm 24-Pin 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, QFN Package
LTC3555
Switching USB Power Manager with Li-Ion/Polymer
Charger, Triple Synchronous Buck Converter + LDO
Complete Multifunction PMIC: Switch Mode Power Manager and Three
Buck Regulators + LDO, 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/1A
Bat-Track Adaptive Output Control, 200mΩ Ideal Diode, 4mm × 5mm
28-Pin QFN Package
LTC3559
Linear USB Li-Ion/Polymer Battery Charger with Dual
Synchronous Buck Converter
Adjustable Synchronous Buck Converters, Efficiency: >90%, Outputs:
Down to 0.8V at 400mA for each, Charge Current Programmable up to
950mA, USB Compatible, 3mm × 3mm 16-Pin QFN Package
Battery Chargers
LTC4055
USB Power Controller and Battery Charger
Charges Single Cell Li-Ion Batteries Directly from a USB Port, Thermal
Regulation, 200mΩ Ideal Diode, 4mm × 4mm 16-Pin QFN Package
LTC4066
USB Power Controller and Li-Ion Battery Charger with
Low Loss Ideal Diode
Charges Single Cell Li-Ion Batteries Directly from a USB Port, Thermal
Regulation, 50mΩ Ideal Diode, 4mm × 4mm 24-Pin QFN Package
LTC4085
USB Power Manager with Ideal Diode Controller and
Li-Ion Charger
Charges Single Cell Li-Ion Batteries Directly from a USB Port, Thermal
Regulation, 200mΩ Ideal Diode with <50mΩ Option, 4mm × 3mm
14-Pin DFN Package
LTC4088
High Efficiency USB Power Manager and Battery Charger Maximizes Available Power from USB Port, Bat-Track, “Instant On”
Operation, 1.5A Max Charge Current, 180mΩ Ideal Diode with <50mΩ
Option, 3.3V/25mA Always On LDO, 4mm × 3mm 14-Pin DFN Package
LTC4089/LTC4089-5 USB Power Manager with Ideal Diode Controller and
High Efficiency Li-Ion Battery Charger
1.2A Charger, 6V to 36V (40V_MAX), 200mΩ Ideal Diode with 50mΩ
Option, 6mm × 3mm 22-Pin DFN Package
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
35571fc
LT 0808 REV C • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007