MP2910 – 5V/12V SYNCHRONOUS BUCK PWM DC-DC AND LINEAR POWER CONTROLLER

MP2910 Rev. 1.0

www.MonolithicPower.com

11

12/14/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

The over current trip point is very sensitive to

external parasitic capacitance because the OPS

pin function is similar to RC charging/discharging

circuit.

When OCP is trigged, a hiccup restart sequence

will be initialized and only 4 times of trigger are

allowed to latch off (Refer to OCP waveforms as

shown in Typical Performance Characteristics).

VIN_POR (VIN Power On Reset)

recognized ready by sensing the voltage of OPS

pin crossing 1.5V four times (rising & falling).

internal 38μA current source flowing through

higher than 1.5V. If so, the VIN_POR function will

be lower than 30kΩ.

Shutdown

Connect a small transistor from the OPS pin to

ground,

then

enabling

the

transistor

can

shutdown the MP2910 as shown in typical

application circuit.

UVP (Under Voltage Protection)

To protect against UV, the voltage of FB and FBL

pins is monitored in MP2910. The UV threshold

typical value is 82.5% of the FB or FBL rated

value. Once UVP_FBL is trigged, a hiccup restart

sequence will be initialized and only 4 times of

trigger are allowed to latch off. During soft-start

interval hiccup is disabled. UVP_FB has some

difference from OCP and UVP_FBL, it will always

hiccup. So the controller will restart when the

voltage of FB pin recovers.