特性 Features

High-Efficiency Synchronous Step-Down

Converter With up to 95% Efficiency

3.1-V to 17-V Operating Input Voltage Range

Adjustable Output Voltage Range: 1.2 V to 16

Fixed Output Voltage Options Available in

3.3 V and 5 V

Synchronizable to External Clock: Up to 1.4 MHz

Up to 1.5-A Output Current

High Efficiency Over a Wide Load-Current

Range Due to PFM/PWM Operation Mode

100% Maximum Duty Cycle for Lowest Dropout

20-μA Quiescent Current (Typical)

Overtemperature and Overcurrent Protected

Available in 16-Pin VQFN Package

Applications

Point-of-Load Regulation From 12-V Buses

Organizers, PDAs, and Handheld PCs

Handheld Scanners

描述 Description

The TPS6211x devices are a family of low-noise

synchronous step-down DC-DC converters that are

ideally suited for systems powered from a 2- to 4-cell

Li-ion battery or from a 12-V or 15-V rail.

The TPS6211x devices are synchronous pulse width

modulation (PWM) converters with integrated N- and

P-channel power MOSFET switches. Synchronous

rectification is used to increase efficiency and to

reduce external component count. To achieve highest

efficiency over a wide load-current range, the

converter enters a power-saving, pulse frequency

modulation (PFM) mode at light load currents.

Operating frequency is typically 1 MHz, allowing the

use of small inductor and capacitor values. The

device can be synchronized to an external clock

signal in the range of 0.8 MHz to 1.4 MHz. For low-

noise operation, the converter can be operated in

PWM-only mode. In shutdown mode, the current

consumption is reduced to less than 2 μA. The

TPS6211x family of devices are available in the 16- pin (RSA) VQFN package, and operate over a free-

air temperature range of –40°C to 85°C.