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LTC3557

Description
USB Power Manager with Li-Ion Charger and Three Step-Down Regulators
File Size315KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3557 Overview

USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

LTC3557/LTC3557-1
USB Power Manager with
Li-Ion Charger and Three
Step-Down Regulators
FEATURES
DESCRIPTION
The LTC
®
3557/LTC3557-1 is a highly integrated power
management and battery charger IC for single cell Li-Ion/
Polymer battery applications. It includes a PowerPath
TM
manager with automatic load prioritization, a battery
charger, an ideal diode and numerous internal protection
features. Designed specifically for USB applications, the
LTC3557/LTC3557-1 power manager automatically limits
input current to a maximum of either 100mA or 500mA
for USB applications or 1A for wall adapter powered
applications. Battery charge current is automatically
reduced such that the sum of the load current and the
charge current does not exceed the programmed input
current limit. The LTC3557/LTC3557-1 also includes three
adjustable synchronous step-down switching regulators
and a high voltage buck regulator output controller with
Bat-Track that allows efficient charging from supplies as
high as 38V. The LTC3557/LTC3557-1 is available in a low
profile 4mm
×
4mm
×
0.75mm 28-pin QFN package.
, LT LTC, LTM and Burst Mode are registered trademarks of Linear Technology
,
Corporation. Bat-Track and PowerPath are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118, 6700364. Other patents pending.
Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB, 5V Wall Adapter or High
Voltage Buck Regulator with Bat-Track
TM
200mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When Input Current is Limited or Unavailable
Triple Adjustable High Efficiency Step-Down
Switching Regulators (600mA, 400mA, 400mA I
OUT
)
Pin Selectable Burst Mode
®
Operation
Full Featured Li-Ion/Polymer Battery Charger
1.5A Maximum Charge Current with Thermal Limiting
Battery Float Voltage:
4.2V (LTC3557)
4.1V (LTC3557-1)
Low Profile 4mm
×
4mm 28-Pin QFN Package
APPLICATIONS
HDD-Based MP3 Players
PDA, PMP PND/GPS
,
USB-Based Handheld Products
TYPICAL APPLICATION
HV SUPPLY
8V TO 38V
(TRANSIENTS
TO 60V)
Input and Battery Current vs Load Current
HIGH VOLTAGE
BUCK DC/DC
600
500
400
0V
CURRENT (mA)
V
OUT
CC/CV
CHARGER
LTC3557/LTC3557-1
ALWAYS ON LDO
TRIPLE HIGH EFFICIENCY
STEP-DOWN
SWITCHING REGULATORS
35571 TA01a
R
PROG
= 2k
R
CLPROG
= 2k
I
IN
100mA/500mA
1000mA
USB OR
5V ADAPTER
I
LOAD
300
200
100
0
–100
0
WALL = 0V
100
200
I
BAT
(DISCHARGING)
400
300
I
LOAD
(mA)
500
600
I
BAT
(CHARGING)
CHARGE
+
NTC
SINGLE CELL
Li-Ion
3.3V/25mA
0.8V to 3.6V/600mA
0.8V to 3.6V/400mA
0.8V to 3.6V/400mA
RST
35571 TA01b
35571fc
1

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