Datasheet

Introduction www.ti.com
1 Introduction
1.1 Requirements
The TPS61253, TPS61258, and TPS61259 devices provide a power-supply solution for products powered
by either a three-cell alkaline, NiCd or NiMH battery, or a single-cell Li-Ion or Li-polymer battery. The wide
input voltage range is ideal for portable power applications such as mobile phones or computer
peripherals. In addition, these devices maintain their output biased at the input voltage level. In this mode,
the synchronous rectifier is current-limited, and allows external loads (for example, an audio amplifier) to
be powered with a restricted supply. In this mode, quiescent current is reduced to 22 μA. Input current in
shutdown mode is less than 5 μA in order to maximize battery life.
1.2 Requirements
The TPS6125xEVM-766 is designed to operate over the full input voltage range and produces a fixed
output voltage. See Table 1 for fixed output voltage and required input voltages for each version options.
1.3 Applications
• USB Charging Port
• Li-Ion Applications
• Audio Applications
• RF-PA Buffers
1.4 Features
• Up to 92% Efficiency
• V
IN
Range from 2.65 V to 4.85 V for TPS61253/9 and to 4.35 V for the TPS61258
• 22-μA Quiescent Current in Standby Mode
• 5-μA Shutdown Current
• 100% Duty-Cycle Mode when V
IN
> V
OUT
• Selectable Standby Mode or True Load Disconnect During Shutdown
• Double-sided, two-active-layer printed circuit board (PCB) with all components on top side
• Active converter area of approximately 25 mm
2
2
TPS6125xEVM-766, 3.5-MHz High Efficiency Step-Up Converter In Chip SLVU744–August 2012
Scale Packaging EVM
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