STLD20D-DEF datasheet(1/8 Pages) STMICROELECTRONICS

部件名	STLD20D-DEF

功能描述	WHITE LED POWER SUPPLY

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 8 page

®

1/8

STLD20D

WHITE LED POWER SUPPLY

PRELIMINARY DATA

October 2004

REV. 2

FEATURES

■ High efficiency above 80%

■ Can drive up to 4 LEDs in series from 2.8V

supply

■ Constant LED current regulation

■ Integrated LED disconnect switch that cuts the

LEDs branch in shutdown mode

■ Constant switching frequency

■ Stable current regulation across the total input

voltage range

■ Supply voltage rejection

■ Inherent soft start by limiting the peak inductor

current

■ Peak inductor current adjustability (STLD20D-

C8 only)

■ Shutdown pin with possibility of PWM dimming

control

■ Over voltage and over temperature protection

with automatic restart

■ Low shutdown current < 1µA

■ Small external inductor (10µH, height < 2mm)

■ Tiny ceramic external capacitor

■ Can be supplied by a Li-ion battery - VIN range:

2.5Vdc to 5Vdc

Table 1: Order Codes

Part Number

Marking

Package

STLD20D-C8

L2D

SOT23-8L

STLD20D-DEF

L2D

QFN 3x3 8L

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

ASD™

Figure 1: Basic connection

L = 10µH

D

Cout = 1µF

Cin = 2.2µF

I

= 20mA

LED

RSET

VBATT

RLED

VOUT

VIN

LDS

FB

D: STM BAT20J

L: Murata LQH32CN100K33

SW

GND

(*) STLD20D-C8 only

SHDN

R

(*)

SET

STLD20D

APPLICATION

■ White Led supply for LCD backlight

■ Mobile phone

■ PDA and organizers

■ Any handsets powered from 2.8V to 4.2V

DESCRIPTION

The STLD20D is a constant switching frequency

boost regulator with specific features to supply up

to 4 white LEDs in series. A stable LED current

regulation, from 2.8V to 4.2V, is achieved by sens-

ing the LED current through a low ohmic shunt re-

sistor RLED (see figure 1). The device also

includes a supply rejection circuit that prevent any

kind of flickering effect on the display during dy-

namic supply voltage variation. A LED disconnect

switch cut the LED branch to reduce the current

consumption in shutdown mode. The maximum

peak inductor current can be programmed. The

STLD20D includes often numerous features and in-

novative design circuit that allows getting an efficien-

cy above 80% across the total supply voltage range.

Figure 2: Efficiency versus input voltage

(ILED=20mA; Tamb=25°C)

78

79

80

81

82

83

84

85

86

87

88

2.5

3

3.5

4

4.5

5

Input voltage (Vdc)

Efficiency (%)

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