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SC908 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC908 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 30 page  © 2008 Semtech Corporation POWER MANAGEMENT 1 SC908 Power Management IC for Single-Cell Li-Ion Devices Features Single Cell Li-Ion battery charger — CC/CV charging with current soft start Charger regulated output voltage — 4.2V ±1% over temperature 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 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 Applications Bluetooth headsets MP3 players Low cost mobile phones Description The SC908 is a complete power management system designed for use in Bluetooth wireless headsets, portable media players, and other battery-powered electronics where size is critical. Included are a full featured stand- alone Li-Ion battery charger with a programmable low-battery monitor, a low noise LDO regulator, and a DC- DC buck converter. Battery charging features include programmable pre- charge, fast-charge, and termination current settings. Charge termination is controlled by a programmable timer and by a resistor that sets the termination current. The 28V max input voltage protects against hotplug over- shoot and faulty adapters without additional protection circuitry. The battery voltage Kelvin sense input elimi- nates errors due to high charging currents. A battery thermistor interface disables charging when the battery temperature exceeds safe-to-charge limits. The step-down switching regulator (buck converter) improves system efficiency and extends battery life. The LDO regulator can be powered directly from the battery or from the buck converter output when efficiency is criti- cal. The fast-starting low noise LDO regulator is suitable for audio, RF, or general purpose regulation required by peripheral devices, such as a vibrating alert motor. The low battery detector warns when the battery level is below 3.3V, and when the battery has discharged below a lower programmable voltage limit. SC908 BAT IPRGM ITERM DGND EN_NTC CHRGB RTIME RIPRGM Li-Ion BATTERY CBAT LVIN LVOUT CLVOUT LS RS1 RS2 LEN SEN SFB PGND SLX AGND CSVOUT SVOUT, To Bluetooth Processor RRTIME RNPU RNTC (Battery Pack NTC Thermistor) FLTB LBATB CLVIN RL1 RL2 LFB RLBAT RITERM BSEN RRLBAT VAD Charging Adapter CVAD Can supply LDO from battery or from DC-DC converter VSYS CVREF VREF CVSYS CPB CSFB Charging Charger Present To Audio Circuits or vibrator motor CSFG Typical Application Circuit January 24, 2008 US Patent: 6,836,095 |
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