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STLD20D-DEF Datasheet

  • STLD20D-DEF

  • WHITE LED POWER SUPPLY

  • 8頁(yè)

  • STMICROELECTRONICS   STMICROELECTRONICS

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STLD20D
WHITE LED POWER SUPPLY
PRELIMINARY DATA
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FEATURES
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APPLICATION
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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 < 1碌A(chǔ)
Small external inductor (10碌H, height < 2mm)
Tiny ceramic external capacitor
Can be supplied by a Li-ion battery - V
IN
range:
2.5Vdc to 5Vdc
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 R
LED
(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
(I
LED
=20mA; T
amb
=25擄C)
Efficiency (%)
88
Figure 1: Basic connection
V
BATT
L = 10碌H
D
87
86
Cin = 2.2碌F
Cout = 1碌F
85
84
83
SW
V
OUT
R
SET
(*)
R
SET
I
LED
= 20mA
82
81
80
79
V
IN
STLD20D
LDS
FB
SHDN
GND
R
LED
D: STM BAT20J
L: Murata LQH32CN100K33
(*) STLD20D-C8 only
78
2.5
3
3.5
4
4.5
5
Input voltage (Vdc)
Table 1: Order Codes
Part Number
STLD20D-C8
STLD20D-DEF
Marking
L2D
L2D
Package
SOT23-8L
QFN 3x3 8L
October 2004
REV. 2
1/8
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

STLD20D-DEF 產(chǎn)品屬性

  • 3,000

  • 集成電路 (IC)

  • PMIC - LED 驅(qū)動(dòng)器

  • -

  • 是

  • -

  • 1

  • 是

  • 背光

  • 白色 LED

  • 400kHz ~ 600kHz

  • 2.8 V ~ 4.2 V

  • -

  • 表面貼裝

  • 8-QFN

  • 8-QFN 裸露焊盤(pán)（3x3）

  • 帶卷 (TR)

  • -40°C ~ 85°C

  • 497-4362-2

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