SMB137 SUMMIT Microelectronics, Inc:, SMB137 Datasheet
SMB137
Manufacturer Part Number
SMB137
Description
Programmable Switching Li+ Battery Charger With Usb/ac Input, Currentpath? Manager, Turbochargetm Mode*, Low Battery Recovery* And Usb On-the-go Support
Manufacturer
SUMMIT Microelectronics, Inc:
Datasheet
1.SMB137.pdf
(1 pages)
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Programmable Switching Li+ Battery Charger with USB/AC Input, CurrentPath™ Manager,
TurboCharge
• Standalone or CPU-controlled operation
• USB or AC input with automatic input selection and
• Up to 750mA charging output from 500mA USB port or 1500mA
• Input/output CurrentPath™ control allows system operation
• “Low Battery Recovery” mode for >500mA startup from 100mA
• USB On-the-Go (OTG) power support (up to 500mA @ +5V)
• Reverse current blocking prevents inadvertent battery
• High-efficiency step-down regulator with 2MHz switching
• Precision integrated current sensing
• +4.35 to +5.5V input voltage range
• +16V input tolerance (non-operating)
• High-accuracy float voltage regulation: 1.0%
• Digital programming of all major parameters via I
• Comprehensive protection features
• Tiny CSP-30 package
Applications
•
•
•
•
Figure 1 – Using the SMB137 to charge a single cell Li+ battery from USB or AC Adapter power sources
*Patent Pending
FEATURES & APPLICATIONS
SYSTEM APPLICATION
programmable input current limiting (USB2.0 compliant)
from AC adapter using proprietary “TurboCharge
with deeply discharged/missing battery – no start-up delay
USB port with deeply discharged cells – no start-up delay
discharge
Portable Media Players
Smartphones/PDA’s
Digital camcorders/still cameras
Handheld GPS
o
o
o
o
o
o
o
o
© SUMMIT Microelectronics, Inc. 2007
Pre-charge voltage, float voltage
Input/pre-charge/fast charge/term. current
Battery temperature limits, safety timers
Status/fault indicator
Battery/IC thermal protection
Short circuit/UV/OV protection
Charge termination safety timers
Software watchdog timers
TM
Mode*, Low Battery Recovery* and USB On-The-Go Support
4.5V-5.5V (16V OVP)
up to 1400mA
USB Charger
AC/DC Adapter
up to 1400mA
(16V OVP)
4.5V-5.5V
4.35V-5.5V
USB2.0
500mA
http://www.summitmicro.com/
2
TM
C interface
Mode”
• 757 N. Mary • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
AC/DC Input 700-1400mA
USB-OTG 5.0V @ 500mA
100/500/700-1400mA
USB Input
1.1 9/30/2007
1
Handheld Device
SMB137
The SMB137 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.
charging devices, the SMB137’s high-efficiency switch-mode operation
eliminates the low charge current and thermal problems of
conventional linear solutions.
conjunction with programmability enables dramatically faster charging
– TurboCharge™ mode - from current limited in puts such as USB.
The SMB137 can switch between USB mode and AC Adapter mode
and works seamlessly in conjunction with a USB controller. Also the
SMB137 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 SMB137 can run its
switching regulator in reverse to support “Low Battery Recovery” mode
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
I
a flexible solution. Fast charge current level can be set via I
by the input current settings). An Enable (EN) pin is also provided for
suspending charging and/or sleep mode.
blocking prevents inadvertent cell discharge.
The SMB137 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.
1.0% battery float voltage control ensure 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.
specified from +4.35V to +5.5V with +16V non-operating input
tolerance.
package and is rated over the –30C to +85C temperature range.
2
C/SMBus and stored in non-volatile memory making the device truly
INTRODUCTION
System Output up to 1400mA
OTG/LBR 750mA
LBR Output 5.0V @ 500mA
Charging up to 1500mA
(optional)
I2C
The SMB137 is available in a ultra-compact CSP-30
Ion
Li-
USB
Also the switching architecture in
Advance Information
Built-in reverse-current
SMB137
Operating voltage is
Unlike conventional
2
C (limited
Accurate
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