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TPS61040 Datasheet

  • TPS61040

  • 采用 SOT-23 封裝用于 LCD 和白光 LED 的 28V 400mA 開(kāi)關(guān)升壓轉(zhuǎn)...

  • 19頁(yè)

  • TI

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TPS61040
TPS61041
SLVS413B 鈥?OCTOBER 2002 鈥?REVISED MAY 2004
LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE
FEATURES
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1.8 V to 6 V Input Voltage Range
Adjustable Output Voltage Range up to 28 V
400 mA (TPS61040) and 250 mA (TPS61041)
Internal Switch Current
Up to 1 MHz Switching Frequency
28 碌A(chǔ) Typical No Load Quiescent Current
1 碌A(chǔ) Typical Shutdown Current
Internal Softstart
Available in a Tiny 5-Pin SOT23 Package
DESCRIPTION
The TPS61040/41 is a high-frequency boost con-
verter dedicated for small to medium LCD bias supply
and white LED backlight supplies. The device is ideal
to generate output voltages up to 28 V from a dual
cell NiMH/NiCd or a single cell Li-Ion battery. The
part can also be used to generate standard 3.3 V/5 V
to 12 V power conversions.
The TPS61040/41 operates with a switching fre-
quency up to 1 MHz. This allows the use of small
external components using ceramic as well as tanta-
lum output capacitors. Together with the tiny SOT23
package, the TPS61040/41 gives a very small overall
solution size. The TPS61040 has an internal 400 mA
switch current limit, while the TPS61041 has a 250
mA switch current limit, offering lower output voltage
ripple and allows the use of a smaller form factor
inductor for lower power applications. The low quiesc-
ent current (typically 28 碌A(chǔ)) together with an
optimized control scheme, allows device operation at
very high efficiencies over the entire load current
range.
DBV PACKAGE
(TOP VIEW)
APPLICATIONS
LCD Bias Supply
White-LED Supply for LCD Backlights
Digital Still Camera
PDAs, Organizers and Handheld PCs
Cellular Phones
Internet Audio Player
Standard 3.3 V/5 V to 12 V Conversion
SW
GND
FB
1
2
3
5
V
IN
4
EN
TYPICAL APPLICATION
EFFICIENCY
vs
OUTPUT CURRENT
L1
10
碌H
90
D1
V
OUT
V
IN
to 28 V
1
3
2
R1
Efficiency - %
88
86
84
82
80
78
76
V
O
= 18 V
V
IN
1.8 V to 6.0 V
V
I
= 5 V
C
FF
C
O
1
碌F
V
I
= 3.6 V
5 V
IN
SW
FB
V
I
= 2.4 V
C
IN
4.7
碌F
4
EN
GND
R2
74
72
70
0.10
1
10
I
O
- Output Current - mA
100
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 漏 2002鈥?004, Texas Instruments Incorporated

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