sc9261数码,MP3,音箱升压ic,升压到5V
General Description
The SC9261 Series are VFM Step-up DC/DC ICs with ultra low supply current by CMOS process and suitable for use with battery-powered instruments.
The SC9261 IC consists of an oscillator, a VFM control circuit, a driver transistor (LX switch), a reference voltage unit, an error amplifier, resistors for voltage detection, and a LX switch protection circuit. A low ripple and high efficiency step-up DC/DC converter can be constructed of this SC9261 IC with only three external components.
The SC9261A IC provides with a drive pin (EXT) for an external transistor, so that a power transistor can be externally applied. Therefore, the SC9261A IC is recommended for applications where large currents are required. EN pin enables circuit to set the standby supply current at a maximum of 0.5uA.
Features
- Ø Minimal Number of External Components ( Only an Inductor, a Diode, and a Capacitor)
- Ø Ultra Low Input Current ( 5uA at Switch Off)
- Ø &plun; 2% High Output Voltage Accuracy
- Ø Low Ripple and Low Noise
- Ø
- Ø 75% Efficiency with Low Cost Inductor
- Ø +50 ppm/℃Low Temperature-Drift
- Ø SOT-89 and SOT-23-5 all Packages
- Ø RoHS Compliant and 100% Lead (Pb)-Free
Applications
- Ø Power source for battery-powered equipment
- Ø Power source for cameras, camcorders, VCRs, PDAs, pagers, electronic data banks, and hand-held communication equipment
- Ø Power source for applications, which require higher voltage than t
