HM1534

HM1534 ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Description The HM1534 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. With an internal low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current. The HM1534 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current. Selection Guide Feature  Low voltage operation: Start-up is guaranteed from 0.9 V(IOUT =1 mA )  Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % .  oscillator frequency：1.0MHz  Output voltage range: 1.5V ~12 V  Output voltage accuracy：±2%  Soft start function: 2 mS.  PACK...