TPS61040 Datasheet, PDF (1/18 Pages) Texas Instruments – LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE

www.ti.com
TPS61040
TPS61041
SLVS413B – OCTOBER 2002 – REVISED MAY 2004
LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE
FEATURES
• 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 µA Typical No Load Quiescent Current
• 1 µA Typical Shutdown Current
• Internal Softstart
• Available in a Tiny 5-Pin SOT23 Package
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
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 µA) together with an
optimized control scheme, allows device operation at
very high efficiencies over the entire load current
range.
DBV PACKAGE
(TOP VIEW)
SW ¹
5
V_IN
GND 2
FB
3
4
EN
TYPICAL APPLICATION
V_IN
1.8 V to 6.0 V
C_IN
4.7 µF
L1
10 µH
D1
5 _{VIN SW} 1
FB ³
4 _{EN GND} 2
R1
R2
V_OUT
V_IN to 28 V
C_FF
C_O
1 µF
EFFICIENCY
vs
OUTPUT CURRENT
90
88
V_O = 18 V _{VI = 5 V}
86
84
V_I = 3.6 V
82
80
78
V_I = 2.4 V
76
74
72
70
0.10
1
10
100
I_O - Output Current - mA
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 © 2002–2004, Texas Instruments Incorporated