LTC3557-1 Linear Technology, LTC3557-1 Datasheet

LTC3557-1

Manufacturer Part Number

LTC3557-1

Description

USB Power Manager

Manufacturer

Linear Technology

Datasheet

1.LTC3557-1.pdf (28 pages)

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FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

Seamless Transition Between Input Power Sources:

Li-Ion Battery, USB, 5V Wall Adapter or High

Voltage Buck Regulator with Bat-Track

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 Efﬁ ciency Step-Down

Switching Regulators (600mA, 400mA, 400mA I

Pin Selectable Burst Mode

Full Featured Li-Ion/Polymer Battery Charger

1.5A Maximum Charge Current with Thermal Limiting

Battery Float Voltage:

Low Proﬁ le 4mm × 4mm 28-Pin QFN Package

HDD-Based MP3 Players

PDA, PMP, PND/GPS

USB-Based Handheld Products

5V ADAPTER

4.2V (LTC3557)

4.1V (LTC3557-1)

(TRANSIENTS

HV SUPPLY

CHARGE

USB OR

8V TO 38V

TO 60V)

RST

SWITCHING REGULATORS

100mA/500mA

LTC3557/LTC3557-1

TRIPLE HIGH EFFICIENCY

1000mA

ALWAYS ON LDO

HIGH VOLTAGE

BUCK DC/DC

STEP-DOWN

CHARGER

CC/CV

Operation

35571 TA01a

NTC

3.3V/20mA

0.8V to 3.6V/600mA

0.8V to 3.6V/400mA

SINGLE CELL

Li-Ion

OUT

)

DESCRIPTION

The LTC

management and battery charger IC for single cell Li-

Ion/Polymer battery applications. It includes a Power-

Path

charger, an ideal diode and numerous internal protection

features. Designed speciﬁ cally 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 ap-

plications. Battery charge current is automatically reduced

such that the sum of the load current and the charge cur-

rent 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 efﬁ cient charging from supplies as high as

38V. The LTC3557/LTC3557-1 is available in a low proﬁ le

4mm x 4mm x 0.75mm 28-pin QFN package.

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.

, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology

USB Power Manager with

Li-Ion Charger and Three

manager with automatic load prioritization, a battery

Step-Down Regulators

3557/LTC3557-1 is a highly integrated power

–100

LTC3557/LTC3557-1

600

500

400

300

200

100

Input and Battery Current vs Load Current

WALL = 0V

PROG

CLPROG

100

= 2k

200

LOAD

(DISCHARGING)

300

(mA)

(CHARGING)

BAT

400

LOAD

BAT

500

35571 TA01b

600

35571f

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