LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER
WITH 1.3-A SWITCHES

FEATURES
• More than 90% Efficiency at
- 300 mA Output Current at 3.3 V
(VIN > 2.4 V)
- 600 mA Output Current at 5 V (VIN > 3 V)
• Automatic Transition between Boost Mode and
Down Conversion Mode
• Device Quiescent Current less than 55 uA
• Startup into Full Load at 0.5 V Input Voltage
• Operating Input Voltage Range from
0.3 V to 5.5 V
• Programmable Undervoltage Lockout
Threshold
• Output Short Circuit Protection Under all
Operating Conditions
• Fixed and Adjustable Output Voltage Options
from 1.8 V to 5.5 V
• Power Save Mode for Improved Efficiency at
Low Output Power
• Forced fixed Frequency Operation possible
• Load Disconnect During Shutdown
• Overtemperature Protection
• Small 3 mm x 3 mm QFN-10 Package


APPLICATIONS
• All Single-Cell, Two-Cell and Three-Cell
Alkaline, NiCd or NiMH or Single-Cell Li
Battery Powered Products
• Fuel Cell And Solar Cell Powered Products
• Portable Audio Players
• PDAs
• Cellular Phones
• Personal Medical Products
• White LED'S

DESCRIPTION
The TPS6120x devices provide a power supply solution for products powered by either a single-cell, two-cell, or
three-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer battery. It is also used in fuel cell or solar cell
powered devices where the capability of handling low input voltages is essential. Possible output currents are
depending on the input to output voltage ratio. The devices provides output currents up to 600 mA at a 5-V
output while using a single-cell Li-Ion or Li-Polymer battery, and discharge it down to 2.5 V. The boost converter
is based on a fixed frequency, pulse-width-modulation (PWM) controller using synchronous rectification to obtain
maximum efficiency. At low load currents, the converter enters the Power Save mode to maintain a high
efficiency over a wide load current range. The Power Save mode can be disabled, forcing the converter to
operate at a fixed switching frequency. The maximum average input current is limited to a value of 1500 mA. The
output voltage can be programmed by an external resistor divider, or is fixed internally on the chip. The converter
can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the
battery. The device is packaged in a 10-pin QFN PowerPAD™ package (DRC) measuring 3 mm x 3 mm.