SGM3140B datasheet(7/14 Pages) SGMICRO

部品番号	SGM3140B

部品情報	Charge Pump LED Driver

PDF	14 Pages

Scroll/Zoom	100%

メーカー	SGMICRO [SG Micro Corp]

ホームページ	http://www.sg-micro.com

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7 / 14 page

500mA Buck/Boost

Charge Pump LED Driver

SGM3140B

SG Micro Corp

www.sg-micro.com

TYPICAL APPLICATION

The SGM3140B can be used with multiple LEDs in parallel as shown in Figure 1. For best performance, the LEDs

should be in a single package, preferably from a single die to have better matching for forward voltage VF for a given

forward current IF. In practice, if the VF of one LED is higher than the others, it will consume a larger IF, which will raise its

temperature which will then cause its VF to decrease, correcting the imbalance. The overall current will be the sum of the

individual currents, for example ITOTAL = 4 × ILED.

VIN

FLASH

VOUT

PGND

SGND

RSET

1μF

CIN

10μF

3.0V to 4.2V

VIN

SGM3140B

Jumper

SW2

REN

10kΩ

RSET

139kΩ

RFB

0.33Ω

COUT

4.7μF

Figure 1. Multiple LED Flash Circuit

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