Semtech Introduces the SC908 Power Management IC for Single-Cell Li-Ion Devices
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Semtech’s SC908 combines a fully featured, robust and high quality 500mA battery charger with a synchronous buck converter and a low noise LDO regulator. The battery charger features "best in class" input voltage rated to 28V, and includes programmability for precharge, fast charge and termination charge currents. Also provided are an NTC interface for battery temperature monitoring and a programmable watchdog timer, both of which enable the device to provide safe stand-alone charging capability. A low battery detector with programmable threshold is also provided.
The 150mA synchronous buck converter features integrated FETs, auto power save, a programmable output and a separate enable, providing an efficient source of power for loads such as processors. The buck converter is powered from the Li-Ion battery. The 150mA low noise LDO features a separate input, separate enable and a programmable output, and can be used to provide power for noise sensitive circuits such as audio circuitry.
Features
- Single Cell Li-Ion battery charger — CC/CV charging with current soft start
- Charger regulated output voltage — 4.2V ±1% overtemperature with Kelvin sense of battery voltage
- Charger input protection withstands 28V indefinitely
- Charger max constant current setting — 500mA
- Adjustable charge termination current down to 10mA
- Battery NTC interface disables charging if battery temperature out of range
- Programmable low battery detector threshold
- Four status indicators
- Programmable charge completion timer
- Buck converter with enable — output programmable from 1V to 3V, 150mA max output
- High buck converter efficiency — 88% at 50mA
- General purpose low noise LDO regulator with fast enable, active shutdown
- 4x4x0.9 (mm) MLPQ package, WEEE and RoHS compliant