Texas Instruments TPS61041 Manual

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LOW-POWER DC/DC BOOST CONVERTER IN SOT-23 AND SON PACKAGES
FEATURES
1
• 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-mA Typical No-Load Quiescent Current
• 1-mA Typical Shutdown Current
• Internal Soft Start
• Available in SOT23-5, TSOT23-5,
and 2 × 2 × 0.8-mm SON Packages
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

TYPICAL APPLICATION

L1
10 µH
V
IN
1.8 V to 6 V
5
V
IN
C
IN
4.7 µF
4
EN
1
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.
Check for Samples: TPS61040,
D1
C
R1
1
SW
3
FB
2
GND
R2
SLVS413F – OCTOBER 2002 – REVISED DECEMBER 2010
TPS61041
DESCRIPTION
The TPS61040/41
converter 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
frequency up to 1 MHz. This allows the use of small
external components using ceramic as well as
tantalum output capacitors. Together with the thin
SON 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
quiescent current (typically 28 mA) together with an
optimized control scheme, allows device operation at
very high efficiencies over the entire load current
range.
DDC, DBV PACKAGE
(Top View)
1
SW
GND 2
3
FB
V
OUT
V to 28 V
IN
FF
C
O
1 µF
Copyright © 2002–2010, Texas Instruments Incorporated
is a high-frequency
operates with
DRV PACKAGE
(Top View)
GND
5 V 1
IN
V
2
IN
EN 3
4 EN
EFFICIENCY
vs
OUTPUT CURRENT
90
V = 18 V
O
88
V = 5 V
I
86
84
V = 3.6 V
I
82
80
V = 2.4 V
I
78
76
74
72
70
0.1 1
I − Output Current − mA
O
TPS61040
TPS61041
boost
a switching
SW
6
NC
5
4 FB
10 100