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PDF SMB137 Data sheet ( Hoja de datos )
| Número de pieza | SMB137 | |
| Descripción | Programmable Switching Li+ Battery Charger | |
| Fabricantes | Summit Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SMB137 (archivo pdf) en la parte inferior de esta página. Total 1 Páginas | ||
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SMB137
Advance Information
Programmable Switching Li+ Battery Charger with USB/AC Input, CurrentPath™ Manager,
TurboChargeTM Mode*, Low Battery Recovery* and USB On-The-Go Support
FEATURES & APPLICATIONS
INTRODUCTION
• Standalone or CPU-controlled operation
• 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
www.DataSheeUt4SUB.cpoomrt with deeply discharged cells – no start-up delay
• USB On-the-Go (OTG) power support (up to 500mA @ +5V)
• Reverse current blocking prevents inadvertent battery
discharge
• 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 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 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. Unlike conventional
charging devices, the SMB137’s high-efficiency switch-mode operation
eliminates the low charge current and thermal problems of
conventional linear solutions. Also the switching architecture in
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
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 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. Accurate
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. Operating voltage is
specified from +4.35V to +5.5V with +16V non-operating input
tolerance. The SMB137 is available in a ultra-compact CSP-30
package and is rated over the –30C to +85C temperature range.
AC/DC Adapter
up to 1400mA
4.5V-5.5V
(16V OVP)
USB Charger
up to 1400mA
4.5V-5.5V (16V OVP)
USB2.0
500mA
4.35V-5.5V
Handheld Device
AC/DC Input 700-1400mA
System Output up to 1400mA
USB Input
100/500/700-1400mA
LBR Output 5.0V @ 500mA
USB-OTG 5.0V @ 500mA SMB137
Charging up to 1500mA
OTG/LBR 750mA Li-
Ion
I2C
(optional)
USB
Figure 1 – Using the SMB137 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/
1.1 9/30/2007
1
1 page | ||
| Páginas | Total 1 Páginas | |
| PDF Descargar | [ Datasheet SMB137.PDF ] | |
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