TPS61040
TPS61041
SLVS413 – FEBRUARY 2002
LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE
FEATURES
D
1.8 V to 6 V Input Voltage Range
D
Adjustable Output Voltage Range up to 28 V
D
400 mA (TPS61040) and 250 mA (TPS61041)
D
D
D
D
D
Internal Switch Current
Up to 1 MHz Switching Frequency
28
µA
Typical No Load Quiescent Current
1
µA
Typical Shutdown Current
Internal Softstart
Available in a Tiny 5-Pin SOT23 Package
DESCRIPTION
The TPS61040/41 is a high-frequency boost 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 operates with a switching frequency
up to 1 MHz. This allows the use of small external
components using ceramic as well as tantalum 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 quiescent current (typically
28
µA)
together with an optimized control scheme,
allows device operation at very high efficiencies over
the entire load current range.
APPLICATIONS
D
LCD Bias Supply
D
White-LED Supply for LCD Backlights
D
Digital Still Camera
D
PDAs, Organizers and Handheld PCs
D
Cellular Phones
D
Internet Audio Player
D
Standard 3.3 V/5 V to 12 V Conversion
TYPICAL APPLICATION
L1
10
µH
EFFICIENCY
vs
OUTPUT CURRENT
90
D1
VOUT
VIN to 28 V
1
3
2
R1
Efficiency – %
88
86
84
82
80
78
76
VO = 18 V
VIN
1.8 V to 6.0 V
VI = 5 V
CFF
CO
1
µF
VI = 3.6 V
5 V
IN
SW
FB
VI = 2.4 V
CIN
4.7
µF
4
EN
GND
R2
74
72
70
0.10
1
10
IO – 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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2002, Texas Instruments Incorporated
www.ti.com
1
ETC [ ETC ]
