SMB137C
Programmable Switching Li+ Battery Charger with USB/AC Input, CurrentPath™ Manager,
TurboChargeTM Mode*, Low Battery Recovery*, AICL* and USB OTG/HDMI/MHL Support
FEATURES & APPLICATIONS
INTRODUCTION
The SMB137C is
a
programmable single-cell lithium-
FEATURES
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.
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
“TurboChargeTM Mode”
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)
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).
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%
Digital programming of major parameters via I2C
interface*
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 I2C/SMBus and stored in non-
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.
Comprehensive protection features
Tiny CSP-30 package
APPLICATIONS
Smartphones
Tablet PCs
Portable Media Players
Perfect Companion for MSM Chipsets
Figure 1 – SYSTEM APPLICATION
Handheld Device
AC/DC Adapter
up to 1500mA
4.5V-6.0V
700-1500mA
System Output
up to 1500mA
Total Sys. Output
>1500mA
AC/DC Input
(18V OVP)
LBR Output
4.17V @ 500mA
USB Input
100/500/700-1500mA
"Ideal Diode"
Current
Charging Current
up to 1500mA
USB Charger
up to 1500mA
4.5V-6.0V (18V OVP)
USB-OTG/
HDMI/MHL
5.0V @ 500mA
SMB137C
Li- Ion
OTG/LBR/HDMI/MHL
750mA
USB2.0
500mA
4.35V-5.5V
I2C (optional)
USB
Using the SMB137C to charge a single cell Li+ battery from USB or AC Adapter power sources
*Patent Granted or Pending
© SUMMIT Microelectronics, Inc. 2012 • 757 N. Mary • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
2156 3.0 4/17/2012
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