STMicroelectronics PM6685
PM6685 is a dual step-down controller specifically designed to provide extremely high efficiency conversion with loss-less current sensing technique. The constant on-time architecture assures fast load transient response and the embedded voltage feed-forward provides nearly constant switching frequency operation. The pulse skipping technique increases efficiency for very light loads.| Part No. | PM6685 |
|---|---|
| Datasheet | PM6685 Download |
| Manufacturer |  STMicroelectronics |
| Description | Dual step-down main supply controller |
| Buy | Stock & Price |
FEATURES
● 6 V to 28 V input voltage range● Fixed 5 V - 3.3 V output voltages
● 5 V and 3.3 V voltage always available to deliver 100 mA of peak current
● 1.230 V ±1% reference voltage available
● Lossless current sensing using low side
● MOSFETs' RDS(on)
● Negative current limit
● Soft-start internally fixed at 2 ms
● Soft output discharge
● Latched OVP and UVP
● Selectable pulse skipping at light loads
● Selectable minimum frequency (33 kHz) in pulse skip mode
● 4 mW maximum quiescent power
● Independent power good signals
● Output voltage ripple compensation
APPLICATIONS
● Notebook computers● Tablet PC or slates
● Mobile system power supply
● 3 and -4 Cells Li+ battery-powered devices Table 1. Device summary Order code VFQFPN-32 (5mm x 5mm)
DESCRIPTION
An embedded integrator control loop compensates the DC voltage error due to the output ripple. Moreover, a minimum switching frequency of 33kHz is selectable in order to avoid audio noise issues. The PM6685 provides a selectable switching frequency, allowing either 200 kHz/300 kHz, 300 kHz/400 kHz, or 400 kHz/500 kHz operation of the 5 V/3.3 V switching sections.
