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PDF STLD40D Data sheet ( Hoja de datos )

Número de pieza STLD40D
Descripción White led power supply
Fabricantes ST Microelectronics　
Logotipo ST Microelectronics Logotipo



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No Preview Available ! STLD40D Hoja de datos, Descripción, Manual

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STLD40D
White led power supply for large display backlight
General Features
s Inductor switches boost controller
s PFM mode control
s High efficiency over wide range of input voltage
from 3.0V to 5.5V
s Overvoltage protection with automatic restart
s Adjustable peak current limit
s Enable pin with possibility of PWM dimming
control
s Low shutdown current <1uA
s Small external component
s Good load and line regulation
s QFN 3mm x 3mm x 1mm 8 leads
Application
s White Led supply for LCD backlight
s Mobile phone
s PDA and organizers
s Any handsets powered form 3.0V to 5.5V
Description
STLD40D is a boost converter that operates from
3.0V to 5.5V and can provide an output voltage as
QFN8 (3mm x 3mm)
high as 37V and can drive up to 10 white LEDs in
series. The converter is a PFM (pulse frequency
modulation) inductor switches and can work in
discontinuous (DCM) mode operation. A minimum
OFF time of the embedded boost switch TSW is
fixed internally and allows limiting the switching
frequency. The output current capability is 20mA
with an output voltage of 37V.
The regulation is done by sensing the led current
through the resistor RLED.
The device can be turned ON/OFF through the
logic enable signal pin EN. By applying a low
frequency PWM signal the LEDs can be dimmed.
The maximum peak inductor current can be
programmed by connected a resistor RSET to the
pin RSET.
Order code
Part number
STLD40DPMR
April 2006
Package
QFN8L (3mm x 3mm)
Rev. 2
Comments
4500 parts per reel
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1 page




STLD40D pdf
STLD40D
3 Electrical characteristics
Electrical characteristics
Table 3. Electrical characteristics
(TJ=-40°C to 85°C, VI=3.6V, VEN=3V, CI=2.2µF, CO=4.7µF, L=4.7µH, RLED=8Ω VO=32V, Typ.
values @ 25°C, unless otherwise specified)
Symbol
Parameter
Test Conditions
VI
VO
IO
ISD
IQ
RDSON
ILIM-ADJ
ILIM
VFB
Line FB
TON_MAX
TOFF_MIN
υ
OVP
OVHYS
VEN
Input voltage range
Output voltage range
Regulated output current
Stand-by current
Quiescent current
Boost switch RDSON
BVDS Breakdown voltage
Maximum peak inductor limit
adjust range Note: 1
Maximum peak inductor limit
when RSET = VI Note: 1
Feedback voltage
Line feedback voltage
Maximum ON Time
Minimum OFF Time
Efficiency at VI = 3.0VDC Note: 1
Efficiency at VI = 5.5VDC Note: 1
Overvoltage protection
Overvoltage hysteresis
Enable input logic low
Enable input logic high
VO = 36V (10 White Leds)
VEN = Low, VI = 3.6V, TJ = 25°C
VEN = Low, VI = 3V to 4.2V
VI = 3V to 4.2V, TJ = 25°C
VI = 5.5V, TJ = 25°C
VI = 5.5V, I = 100mA
VI = 4.2V, I = 100mA
VI = 3.0V, I = 100mA
RSET = 12kΩ to 100kΩ
VI = 3V to 5.5V
VI = 3.6V
VI = 3V to 5.5V
VI = 4.2V
VI = 4.2V
IO = 20 mA, VO = 36VDC
IO = 20 mA, VO = 36VDC
Disable Low VIL
Enable High VIH
Note: 1 Guaranteed by design
Min.
3.0
VI
20
38
0.2
0.75
130
75
80
36
1.2
Typ.
1
0.4
0.8
0.4
0.4
0.5
Max.
5.5
37
3
10
0.8
1.2
Unit
V
V
mA
µA
mA
Ω
V
1A
1.1 A
165 200 mV
5 35 mV
5.5 µs
250 ns
%
42 V
1.5 V
0.3
V
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5 Page





STLD40D arduino
STLD40D
Package mechanical data
DIM.
A
A1
A2
A3
b
b1
D
D2
E
E2
e
K
L
L1
L2
r
r1
MIN.
0.80
0.65
0.15
0.29
0.17
1.92
1.11
0.20
0.20
0.16
QFN8 (3x3) MECHANICAL DATA
mm.
TYP
0.90
0.03
0.70
0.20
0.31
3.00
2.02
3.00
1.21
0.65
0.29
0.24
0.15
0.15
MAX.
1.00
0.05
0.75
0.25
0.39
0.30
2.12
1.31
0.45
0.40
0.13
MIN.
0.032
0.026
0.006
0.011
0.007
0.076
0.044
0.008
0.008
0.006
inch
TYP.
0.035
0.001
0.028
0.008
0.012
0.118
0.080
0.118
0.048
0.026
0.011
0.009
0.006
0.006
MAX.
0.039
0.002
0.030
0.010
0.015
0.012
0.084
0.052
0.018
0.016
0.005
7517789
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