BL8523

BL8523 PWM/PFM Step-down DC-DC Controller DESCRIPTION FEATURES The BL8523 is a CMOS-based PWM step-down DC-DC Controller. The device offers the following advantages: lower supply current and wider operating input-voltage range. The BL8523 consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, a protection circuit, a PWM/PFM alternative circuit, a Chip Enable circuit, and under voltage lockout circuit. A low ripple, high efficiency step-down DC-DC converter can be easily composed of this IC. Output Voltage can be adjusted with external resistors.  Range of Input Voltage: 3V~16V  Built-in Soft-start Function and Protection Function(Reset type protection)  <1μA Shutdown Current and 80uA Quiescent Current  Oscillation Frequency: 500KHz  High efficiency: 95%  High Accuracy Output Voltage:±2.0%  Low Temperature Coefficient: ±100ppm/°C  Operating Temperature Range: -40°C ~85°C  Small Package:SOT23-5  Demo Board Available The BL8523 uses voltage type PWM/PFM mixed operation mode. When the load current is small, the operation will switch into the PFM mode from PWM mode. Therefore the efficiency at small load is improved, and then the chip works on PWM mode. The BL8523 embeds reset type protection circuit. If the term of maximum duty cycle keeps on a certain time, the protection circuit restarts the operation with soft-start and repeat this operation until maximum duty cycle condition is released. When the c...