The PM6681A is a dual step-down controller from ON Semiconductor that provides extremely high efficiency conversion using a lossless current sensing technique. It has a 6 V to 36 V input voltage range, adjustable output voltages, a 0.9-3.3 V LDO adjustable output current of 100 mA peak current, a 5 V LDO that delivers 100 mA peak current, a 1.237 V ±1% reference voltage available, no RSENSE current sensing using low side MOSFETs' RDS(on), negative current limit, a soft-start internally fixed at 2 ms, soft output discharge, latched UVP, not-latched OVP, selectable pulse skipping at light loads, selectable minimum frequency (33 kHz) in pulse skip mode, 5 mW maximum quiescent power, independent Power Good signals, and output voltage ripple compensation.
The PM6681A is a dual synchronous step-down controller specifically designed to provide extremely high efficiency conversion with a lossless current sensing technique. It utilizes a constant on-time architecture to ensure fast load transient response and includes an embedded voltage feed-forward for nearly constant switching frequency operation. The device features an embedded integrator control loop to compensate for DC voltage error due to output ripple.
| Input voltage range | 6 V to 36 V |
|---|---|
| Adjustable LDO output | 0.9 - 3.3 V |
| Fixed LDO output | 5 V |
| Reference voltage | 1.237 V |
| Soft-start time | 2 ms |
| Minimum switching frequency | 33 kHz |
| Quiescent power | 5 mW |
| Package | VFQFPN-32 |
The device supports an input voltage range from 6 V to 36 V.
The soft-start time is internally fixed at 2 ms.
A minimum switching frequency of 33 kHz is selectable in pulse skip mode.