TPS61040-Q1_15 Datasheet, PDF (1/24 Pages) Texas Instruments – LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE

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TPS61040-Q1
TPS61041-Q1
SGLS276C – JANUARY 2005 – REVISED APRIL 2012
LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE
Check for Samples: TPS61040-Q1, TPS61041-Q1
FEATURES
1
• Qualified For Automotive Application
• 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
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 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
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
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.
Copyright © 2005–2012, Texas Instruments Incorporated