1 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 V
• 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

2 Applications

• Point-of-Load Regulation From 12-V Buses
• Organizers, PDAs, and Handheld PCs
• Handheld Scanners

3 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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Typical Application Schematic