MPQ8632-8 datasheet(24/46 Pages) MPS

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MPQ8632 HIGH EFFICIENCY 18V SYNCHRONOUS STEP-DOWN CONVERTER FAMILY FOR 4A TO 20A

MPQ8632 Rev.1.24

www.MonolithicPower.com

8/28/2013

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

For other parts except MPQ8632GLE-10:

Even the FB voltage exceeds 130% of the REF

voltage, these parts enter a non-latch off mode.

Once the FB voltage comes back to the

reasonable value, they will exit this OVP mode

and operate normally again.

UVLO protection

The

MPQ8632

has

under-voltage

lock-out

protection (UVLO). When the VCC voltage

exceeds the UVLO rising threshold voltage, the

MPQ8632 powers up. It shuts off when the VCC

voltage falls below the UVLO falling threshold

voltage. This is non-latch protection.

The MPQ8632 is disabled when the VCC voltage

falls below 3.3 V. If an application requires a

higher UVLO threshold, use the two external

resistors connected to the EN pin as shown in

Figure 9 to adjust the startup input voltage. For

best results, use the enable resistors to set the

input voltage falling threshold (VSTOP) above 3.6 V.

Set the rising threshold (VSTART) to provide

enough hysteresis to account for any input

supply variations.

EN Comparator

RUP

RDOWN

Figure 9

—Adjustable UVLO Threshold

Thermal Shutdown

The MPQ8632 has thermal shutdown. The IC

internally monitors the junction temperature. If

the junction temperature exceeds the threshold

value (minimum 150ºC), the converter shuts off.

This is a non-latch protection. There is about

25ºC hysteresis. Once the junction temperature

drops to about 125ºC, it initiates a soft startup.

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