LP6261 datasheet(6/7 Pages) POWER

6 / 7 page

LP6261-02

Dec.-2019

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 6 of 7

Preliminary Datasheet

LP6261

Application Information

The LP6261 uses a synchronous 1.2MHz fixed

frequency with 1uA ultra-low quiescent current. It is

designed for alkaline battery, coin-cell battery, Li-ion

or Li-polymer battery powered systems, which

requires long battery running time and tiny solution

size.

The LP6261 uses cycle-by-cycle overcurrent

protection. If the inductor peak current reaches the

current limit, the chip turns off the main switch to stop

the further increase in input current. In this case, the

output voltage will decrease until the power balance

between the input and output is reached.

Short-Circuit Protection

Unlike most boost converters, the LP6261 allows

output shorts. In the case of a short circuit, the

LP6261 first turns off the NMOS when the current

detected by the chip reaches the current limit. When

VOUT falls below VIN, the device enters a linear

mode of operation with the same current limit as the

start-up period. In addition, the thermal shutdown

circuits disable switching if the die temperature rises

above 150°C.

Setting the Output Voltage

Set the output voltage by selecting the resistive

voltage divider ratio. The voltage divider drops the

output voltage to the 1.36V feedback voltage.

Determine the resistor RUP and RDN by the following

equation:

VOUT = (

RUP

RDN

+ 1) × VFB

Layout Guide

For high frequency switching power supplies, the

PCB layout is important step in system application

design. In order to let IC achieve good regulation,

high efficiency and stability, it is strongly

recommended the power components(Inductor, input

and output capacitor) should be placed as close as

possible to chip. The set races should be wide and

short.

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