TPS81256_15 Datasheet, PDF (1/26 Pages) Texas Instruments – TPS81256 3-W, High Efficiency Step-Up Converter In MicroSiP™ Packaging

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TPS81256
SLVSAZ9B – JUNE 2012 – REVISED FEBRUARY 2015
TPS81256 3-W, High Efficiency Step-Up Converter In MicroSiP™ Packaging
1 Features
•1 91% Efficiency at 4MHz Operation
• Wide V_IN Range From 2.5V to 5.5V
• I_OUT ≥550mA at V_OUT = 5.0V, V_IN ≥3.3V
• Fixed Output Voltage 5.0V
• ±2% Total DC Voltage Accuracy
• 43µA Supply Current
• Best-in-Class Line and Load Transient
• V_IN ≥ V_OUT Operation
• Low-Ripple Light-Load PFM Mode
• True Load Disconnect During Shutdown
• Thermal Shutdown and Overload Protection
• Sub 1-mm Profile Solution
• Total Solution Size <9mm²
• 9-Pin MicroSiP Packaging
2 Applications
• Cell Phones, Smart-Phones, Tablet PCs
• Mono and Stereo APA Applications
• USB-OTG, HDMI Applications
• USB Charging Port (5V)
3 Description
The TPS81256 device is a complete MicroSiP DC/DC
step-up power solution intended for battery-powered
portable applications. Included in the package are the
switching regulator, inductor and input/output
capacitors. Only a tiny additional output capacitor is
required to finish the design.
The TPS81256 is based on a high-frequency
synchronous step-up DC/DC converter optimized for
battery-powered portable applications.
The DC/DC converter operates at a regulated 4-MHz
switching frequency and enters power-save mode
operation at light load currents to maintain high
efficiency over the entire load current range.
The PFM mode extends the battery life by reducing
the supply current to 43μA (typical) during light load
operation. Intended for low-power applications, the
TPS81256 supports more than 3W output power over
a full Li-Ion battery voltage range. Input current in
shutdown mode is less than 1µA (typical), which
maximizes battery life.
The TPS81256 offers a very small solution size of
less than 9mm² due to minimum amount of external
components. The solution is packaged in a compact
(2.6mm x 2.9mm) and low profile (1.0mm) BGA
package suitable for automated assembly by
standard surface mount equipment.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS81256
µSIP (9)
2.925 mm × 2.575 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application
TPS81256SIP
L
DC/DC Converter
L
VOUT
V
IN
VIN
2.5 V .. 4.85 V
C_O
C_I
EN
GND
ENABLE
GND
Efficiency vs Load Current
100
V = 5.0 V
OUT
90
80
70
4.7µF
60
16V X5R (0603) 50
40
.
30
20
10
0
V_{I - Input Voltage - V}
VO = 5.0 V
IO ^{- Output Current - mA}
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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.