SMB137C

http://www.summitmicro.com/

2156 3.0 4/17/2012

1

Programmable Switching Li+ Battery Charger with USB/AC Input, CurrentPath™ Manager,

TurboCharge

INTRODUCTION

FEATURES

 Automatic Input Current Limit for universal USB/AC/DC

adapter compatibility*

 Optional automatic power source detection per latest

USB charging specification 1.2

 USB or AC input with automatic input selection and

programmable input current limiting (USB2.0 compliant)

 Up to 750mA charging output from 500mA USB port or

1500mA from AC adapter using proprietary

“TurboCharge

 Input/output CurrentPath™ control allows system

operation with deeply discharged/missing battery – no

start-up delay

 “Low Battery Recovery” mode for >500mA startup from

100mA USB port with deeply discharged cells – no

start-up delay*

 USB OTG, HDMI, MHL power support (up to 500mA @

+5V)

 Hardware programmable support for JEITA

 High-efficiency step-down regulator with 3MHz

switching

 +4.35 to +6.0V input voltage range

 +18V input tolerance (non-operating)

 High-accuracy float voltage regulation: 1.0%

interface*

 Comprehensive protection features

APPLICATIONS

 Smartphones

 Tablet PCs

 Portable Media Players

 Perfect Companion for MSM Chipsets

The

SMB137C

is

a

programmable

single-cell

lithium-

ion/lithium-polymer battery charger designed for a variety of

portable applications. Unlike conventional charging devices,

the

SMB137C’s

high-efficiency

switch-mode

operation

eliminates the low charge current and thermal problems of

conventional linear solutions. In addition, the switching

architecture in conjunction with programmability enables

dramatically faster charging – TurboCharge™ mode - from

current limited inputs such as USB.

The SMB137C can switch between USB mode and AC

Adapter mode and works seamlessly in conjunction with a

USB

controller.

The

device

can

manage

two

outputs

independently: battery charging and system power.

This

allows immediate system operation even under missing/deeply

discharged battery conditions. The SMB137C can also run its

switching regulator in reverse to support “Low Battery

Recovery” mode (+4.17V @ 500mA) or USB “On the Go” and

HDMI/MHL power (+5.0V @ 500mA).

Charge

control

includes

input

current

limit

(supporting

USB2.0), trickle charge, pre-charge, constant current/constant

voltage, float voltage and termination/safety settings that are

fully programmable via a serial I

volatile memory making the device truly a flexible solution.

The SMB137C also offers a wide variety of features that

protect the battery pack as well as the charger and input

circuitry:

over-current,

under/over-voltage,

safety

timers,

charge

current/float

voltage

compensation

and

thermal

protection.

Status can be monitored via the serial port for

charge state and fault conditions. In addition, the STAT output

can be used to signal charge status while the SYSOK output

can be used as a System OK indicator. Operating voltage is

specified from +4.35V to +6.0V with +18V non-operating input

tolerance.

The SMB137C is available in an ultra-compact

CSP-30 package and is rated over the -30C to +85C

temperature range.

Figure 1 – SYSTEM APPLICATION

FEATURES & APPLICATIONS

Handheld Device

USB2.0

500mA

4.35V-5.5V

USB Charger

up to 1500mA

4.5V-6.0V (18V OVP)

I2C (optional)

SMB137C

Li- Ion

Charging Current

up to 1500mA

USB

System Output

up to 1500mA

USB-OTG/

HDMI/MHL

5.0V @ 500mA

AC/DC Adapter

up to 1500mA

4.5V-6.0V

(18V OVP)

OTG/LBR/HDMI/MHL

750mA

AC/DC Input

700-1500mA

USB Input

100/500/700-1500mA

"Ideal Diode"

Current

Total Sys. Output

>1500mA

LBR Output

4.17V @ 500mA

Using the SMB137C to charge a single cell Li+ battery from USB or AC Adapter power sources

*Patent Granted or Pending