MP2148 datasheet(16/20 Pages) MPS

16 / 20 page

MP2148 –1A SYNCHRONOUS STEP-DOWN CONVERTER WITH 11µA IQ IN ULTRA-SMALL 1X1.5mm QFN

MP2148 Rev. 1.11

www.MonolithicPower.com

5/25/2015

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

Power Good Indictor (only for MP2148GQD-

XX)

The MP2148 has an open drain and need a

external pull-up resistor (100kΩ~500kΩ) for the

power good indicator (Note: Keep PG pull up

voltage is lower than Vin). When VFB is within -

10% of regulation voltage, VPG is pulled up to

Vo/Vin by the external resistor. If VFB exceeds

the -10% window, the internal MOSFET pulls

the PG to ground. The MOSFET has a

maximum RDSON of less than 400Ω.

Current limit

The MP2148 typically has a 2.4A high-side

switch current limit. When the high side switch

hits its current limit, the MP2148 will remain in

hiccup mode until the current drops. This

prevents the inductor current from continuing to

rise and damage components.

Short Circuit and Recovery

The MP2148 will also enter short-circuit

protection mode when it hits the current limit,

and tries to recover with hiccup mode: The

MP2148 will disable the output power stage,

discharge the soft-start capacitor and then

automatically try soft-start again. If the short

circuit condition remains after soft-start ends,

the MP2148 repeats this cycle until the short

circuit disappears and output rises back to

regulation level.

MP2148 Datasheet(PDF) 16 Page - Monolithic Power Systems