FEATURES
: z VIN Operation Range: 0.65V to 6.0V z 600mV Feedback Voltage z Output Current 1.4A@VIN≧3.0V z Up to 90% Efficiency z Low Start-Up Voltage: 0.9V@Io=1mA z Low Hold Voltage: 0.75V@Io=1mA z 1.0MHz Fixed Switching Frequency z PWM/PFM Auto Switching Maintains High Efficiency z Over-Thermal and Over-Current Protection z Low Shutdown Current: <1.0μA z -40°C to +85°C Temperature Range APPLICATIONS
： z Solar Battery Charger z White LED Torch z Backup Battery Charger z Boost Application TYPICAL APPLICATION CIRCUITS 5 4 MARK 123 SOT23-5 TEL:0755-27933516 FAX:0755-27944650 1 High Efficiency 1MHz, 1.5A Boost Regulator YB1421 Series PIN NUMBER SOT23-5 1 2 3 4 5 PIN NAME FUNCTION SW GND FB CE VOUT Switch Pin. Connect inductor between SW and VIN Signal and Power Ground Feedback Input Chip Enable. High Active Chip Supply Voltage BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS
PARAMETER Voltage Output CE,SW,FB,VOUT Voltage Peak SW Sink and Source Current Power Dissipation SOT-23-5 Operating Temp...
