TPS61170 1.2-A High-Voltage Boost Converter in 2-mm x 2-mm2 QFN Package

1 Features

• 3-V to 18-V Input Voltage Range
• High Output Voltage: Up to 38 V
• 1.2-A Integrated Switch
• 1.2-MHz Fixed Switching Frequency
• 12 V at 300 mA and 24 V at 150 mA From 5-V Input (Typical)
• Up to 93% Efficiency
• On-The-Fly Output Voltage Reprogramming
• Skip-Switching Cycle for Output Regulation at Light Load
• Built-in Soft Start
• 6-Pin, 2-mm × 2-mm QFN Package

2 Applications

• 5-V to 12-V and 24-V, 12-V to 24-V Boost Converter
• Buck Boost Regulation Using SEPIC Topology
• ADSL Modems

3 Description

The TPS61170 is a monolithic, high-voltage switching regulator with integrated 1.2-A, 40-V power MOSFET. The device can be configured in several standard switching-regulator topologies, including boost and SEPIC. The device has a wide input-voltage range to support applications with input voltage from multicell batteries or regulated 5-V, 12-V power rails.

The TPS61170 operates at a 1.2-MHz switching frequency, allowing the use of low-profile inductors and low-value ceramic input and output capacitors. External loop compensation components give the user flexibility to optimize loop compensation and transient response. The device has built-in protection features, such as pulse-by-pulse overcurrent limit, soft start, and thermal shutdown.

The FB pin regulates to a reference voltage of 1.229 V. The reference voltage can be lowered using a 1-wire digital interface (Easyscale™ protocol) through the CTRL pin. Alternatively, a pulse width-modulation (PWM) signal can be applied to the CTRL pin. The duty cycle of the signal reduces the feedback reference voltage proportionally.

The TPS61170 is available in a 6-pin 2-mm × 2-mm QFN package, allowing a compact power-supply solution.

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

4 Typical Application Schematic

5 Revision History

Changes from C Revision (April 2011) to D Revision

• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo

Changes from B Revision (November 2009) to C Revision

• Changed C1 part number in Figure 18, Figure 19, and Figure 20 from "GRM188RA475K " to "GRM21BR61E475K"Go

6 Pin Configuration and Functions

QFN Package

6 Pins

Top View