TPS61120

具有 200mA LDO 的可调节 95% 高效升压转换器，用于单节/双节锂离子电池应用领域

The TPS6112x devices provide a complete power supply solution for products powered by either a one-cell Li-Ion or Li-Polymer by either a one-cell Li-Ion or Li-Polymer battery, or a two- to four-cell Alkaline, NiCd, or NiMH battery. The devices can generate two stable output voltages that are either adjusted by an external resistor divider or are fixed internally on the chip. The device also provides a simple solution for generating 3.3 V out of a one-cell Li-Ion or Li-Polymer battery at a maximum output current of at least 200 mA with supply voltages down to 1.8 V. The implemented boost converter is based on a fixed frequency, pulse-width-modulation PWM controller using a synchronous rectifier to obtain maximum efficiency. The maximum peak current in the boost switch is limited to a value of 1600 mA.

The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and, in effect, lower radiated electromagnetic energy when the converter enters discontinuous conduction mode. A power good output at the boost stage simplifies control of any connected circuits like cascaded power supply stages or microprocessors.

The built-in LDO can be used for a second output voltage derived either from the boost output or directly from the battery. The LDO can be enabled separately that is, using the power good of the boost stage. The device is packaged in a 16-pin VQFN RSA package measuring 4 mm × 4 mm or in a 16-pin TSSOP PW package.

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Synchronous, 95% Efficient, Boost Converter With

500-mA Output Current From 1.8-V Input

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Integrated 200-mA Reverse Voltage Protected

LDO for DC-DC Output Voltage Post Regulation

or Second Output Voltage

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40-µA Typical Total Device Quiescent Current

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Input Voltage Range: 1.8 V to 5.5 V

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Fixed and Adjustable Output Voltage Options up

to 5.5 V

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Power Save Mode for Improved Efficiency at Low

Output Power

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Low Battery Comparator

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Power Good Output

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Low EMI-Converter Integrated Antiringing Switch

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Load Disconnect During Shutdown

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Overtemperature Protection

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Available in a Small 4-mm × 4-mm VQFN-16 or in

a TSSOP-16 Package