TPS61253 Datasheet, PDF (1/34 Pages) Texas Instruments – 3.5-MHz HIGH EFFICIENCY STEP-UP CONVERTER IN CHIP SCALE PACKAGING

TPS61253, TPS61254, TPS61256, TPS61258
www.ti.com
SLVSAG8B – SEPTEMBER 2011 – REVISED MAY 2012
3.5-MHz HIGH EFFICIENCY STEP-UP CONVERTER IN CHIP SCALE PACKAGING
Check for Samples: TPS61253, TPS61254, TPS61256, TPS61258
FEATURES
1
• 93% Efficiency at 3.5MHz Operation
• 22µA Quiescent Current in Standby Mode
• 36µA Quiescent Current in Normal Operation
• Wide V_IN Range From 2.3V to 5.5V
• V_IN ≥ V_OUT Operation
• I_OUT ≥800mA at V_OUT = 4.5V, V_IN ≥2.65V
• I_OUT ≥1000mA at V_OUT = 5.0V, V_IN ≥3.3V
• I_OUT ≥1500mA (Peak) at V_OUT = 5.0V, V_IN ≥3.3V
• ±2% Total DC Voltage Accuracy
• Light-Load PFM Mode
• Selectable Standby Mode or True Load
Disconnect During Shutdown
• Thermal Shutdown and Overload Protection
• Only Three Surface-Mount External
Components Required
• Total Solution Size <25mm²
• 9-Pin NanoFree^TM (CSP) Packaging
APPLICATIONS
• Cell Phones, Smart-Phones
• Mono and Stereo APA Applications
• USB Charging Port (5V)
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VO = 5.0 V
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DESCRIPTION
The TPS6125x device provides a power supply
solution for battery-powered portable applications.
Intended for low-power applications, the TPS6125x
supports up to 800-mA load current from a battery
discharged as low as 2.65V and allows the use of low
cost chip inductor and capacitors.
With a wide input voltage range of 2.3V to 5.5V, the
device supports applications powered by Li-Ion
batteries with extended voltage range. Different fixed
voltage output versions are available from 3.15V to
5.0V.
The TPS6125x operates at a regulated 3.5-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
quiescent current to 36μA (typ) during light load
operation.
In addition, the TPS6125x device can also maintain
its output biased at the input voltage level. In this
mode, the synchronous rectifier is current limited
allowing external load (e.g. audio amplifier) to be
powered with a restricted supply. In this mode, the
quiescent current is reduced to 22µA. Input current in
shutdown mode is less than 1µA (typ), which
maximizes battery life.
The TPS6125x offers a very small solution size due
to minimum amount of external components. It allows
the use of small inductors and input capacitors to
achieve a small solution size. During shutdown, the
load is completely disconnected from the battery.
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70
60
50
40
.
30
20
10
0
V_{I - Input Voltage - V}
I O ^{- Output Current - mA}
V_IN
2.65 V .. 4.85 V
C_I
4.7 μF
L
1 μH
TPS61256
SW
VOUT
VIN
BP
EN
GND
V_OUT
5.0 V @ 700mA
C_O
10 uF
Figure 2. Smallest Solution Size Application
Figure 1. Efficiency vs. Load Current
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information 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 © 2011–2012, Texas Instruments Incorporated