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SMB137B View Datasheet(PDF) - Summit Microelectronics

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SMB137B Datasheet PDF : 1 Pages
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SMB137B
Preliminary Information
Programmable Switching Li+ Battery Charger with USB/AC Input, CurrentPath™ Manager,
TurboChargeTM Mode*, Low Battery Recovery*, AICL* and USB On-The-Go Support
FEATURES & APPLICATIONS
INTRODUCTION
Automatic Input Current Limit for universal USB/AC/DC adapter
compatibility*
Optional automatic power source detection per latest USB
charging specification 1.0
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 On-the-Go (OTG) power support (up to 500mA @ +5V)
Reverse current blocking prevents battery discharge
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 all major parameters via I2C interface
o Pre-charge voltage, float voltage
o Input/pre-charge/fast charge/term. current
o Battery temperature limits, safety timers
Comprehensive protection features
o Status/fault indicator
o Battery/IC thermal protection
o Short circuit/UV/OV protection
o Charge termination safety timers
o Software watchdog timers
Tiny CSP-30 package
Applications
Portable Media Players
Smartphones/PDA’s
Digital camcorders/still cameras
Handheld GPS
SYSTEM APPLICATION
The SMB137B is a programmable single-cell lithium-ion/lithium-
polymer battery charger designed for a variety of portable applications.
The device provides a simple and efficient way to charge high-capacity
Li-Ion batteries via a USB or AC adapter input. Unlike conventional
charging devices, the SMB137B’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 in puts such as USB.
The SMB137B can switch between USB mode and AC Adapter mode
and works seamlessly in conjunction with a USB controller. Also the
SMB137B can manage two outputs independently: battery charging
and system power. This allows immediate system operation even
under missing/deeply discharged battery conditions. Also in the case of
a low battery and insufficient/missing input supply the SMB137B can
run its switching regulator in reverse to support “Low Battery Recovery”
mode (+4.17V @ 500mA) or USB “On the Go” power (+5V @ 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
I2C/SMBus and stored in non-volatile memory making the device truly
a flexible solution. Fast charge current level can be set via I2C (limited
by the input current settings). An Enable (EN) pin is also provided for
suspending charging and/or sleep mode. Built-in reverse-current
blocking prevents inadvertent cell discharge.
The SMB137B 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 and thermal protection. Accurate
1.0% battery float voltage control ensures complete charging and
improves battery capacity utilization. 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. Operating voltage is
specified from +4.35V to +6.0V with +18V non-operating input
tolerance. The SMB137B is available in an ultra-compact CSP-30
package and is rated over the –30C to +85C temperature range.
AC/DC Adapter
up to 1400mA
4.5V-6.0V
(18V OVP)
AC/DC Input
700-1400mA
Handheld Device
System Output
up to 1400mA
Total Sys. Output
>1400mA
USB Charger
up to 1400mA
4.5V-6.0V (18V OVP)
USB Input
100/500/700-1400mA
USB-OTG
5.0V @ 500mA
SMB137B
LBR Output
"Ideal Diode" 4.17V @ 500mA
Current
Charging Current
up to 1500mA
OTG/LBR
750mA
Li- Ion
USB2.0
500mA
4.35V-5.5V
I2C (optional)
USB
Figure 1 – Using the SMB137B to charge a single cell Li+ battery from USB or AC Adapter power sources
*Patent Pending
© SUMMIT Microelectronics, Inc. 2007 • 757 N. Mary • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
2137 2.1 7/7/2009
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