TPS61240_15 Datasheet, PDF (1/29 Pages) Texas Instruments – TPS6124x 3.5-MHz High Efficiency Step-Up Converter

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TPS61240, TPS61241
SLVS806C – APRIL 2009 – REVISED DECEMBER 2014
TPS6124x 3.5-MHz High Efficiency Step-Up Converter
1 Features
•1 Efficiency > 90% at Nominal Operating Conditions
• Total DC Output Voltage Accuracy 5.0 V±2%
• Typical 30-μA Quiescent Current
• Best in Class Line and Load Transient
• Wide V_IN Range From 2.3 V to 5.5 V
• Output Current up to 450 mA
• Automatic PFM/PWM Mode Transition
• Low Ripple Power Save Mode for Improved
Efficiency at Light Loads
• Internal Softstart, 250-μs Typical Start-Up Time
• 3.5-MHz Typical Operating Frequency
• Load Disconnect During Shutdown
• Current Overload and Thermal Shutdown
Protection
• Three Surface-Mount External Components
Required (One MLCC Inductor, Two Ceramic
Capacitors)
• Total Solution Size <13 mm²
• Available in a 6-Pin DSBGA and 2-mm × 2-mm
WSON Package
2 Applications
• USB-OTG Applications
• Portable HDMI Applications
• Cell Phones, Smart Phones
• PDAs, Pocket PCs
• Portable Media Players
• Digital Cameras
V_IN
C_IN
2.2 mF
Typical Application Schematic
L
1 mH
TPS61240
L
VOUT
VIN
FB
C_OUT
4.7 mF
EN
GND
V 5V
OUT
3 Description
The TPS6124x device is a highly efficient
synchronous step-up DC-DC converter optimized for
products powered by either a three-cell alkaline, NiCd
or NiMH, or one-cell Li-Ion or Li-Polymer battery. The
TPS6124x supports output currents up to 450 mA.
The TPS61240 has an input valley current limit of 500
mA, and the TPS61241 has an input valley current of
600 mA.
With an input voltage range of 2.3 V to 5.5 V, the
device supports batteries with extended voltage
range and are ideal to power portable applications
like mobile phones and other portable equipment.
The TPS6124x boost converter is based on a quasi-
constant on-time valley current mode control scheme.
The TPS6124x presents a high impedance at the
V_OUT pin when shut down. This allows for use in
applications that require the regulated output bus to
be driven by another supply while the TPS6124x is
shut down.
During light loads the device will automatically pulse
skip allowing maximum efficiency at lowest quiescent
currents. In the shutdown mode, the current
consumption is reduced to less than 1 μA.
TPS6124x allows the use of small inductors and
capacitors to achieve a small solution size. During
shutdown, the load is completely disconnected from
the battery. The TPS6124x is available in a 6-pin
DSBGA and 2-mm × 2-mm WSON package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61240
WSON (6)
DSBGA (6)
2.00 mm × 2.00 mm
1.25 mm × 0.86 mm
TPS61241
DSBGA (6)
1.25 mm × 0.86 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Efficiency vs Output Current
100
90
V_I = 3.6 V ^{VI = 4.2 V}
80
70
V_I = 3 V
60
V_I = 2.3 V
50
40
30
20
10
0
0.00001 0.0001 0.001 0.01
0.1
1
I_O - Output Current - A
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.