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1FEATURES

2· 2.7 V to 6.0 V Input Voltage Range

· 1′ and 1.5′ Charge Pump

· Auto Switching Between 1′ and 1.5′ Modes

· 750 kHz Charge Pump Frequency

· Seven Individually-regulated WLED

Current Sinks

· Single- Wire Interface for Dimming and

ON/OFF Control

· 25 mA max LED Current for Six Current Sinks

· One 80 mA Current Sink

· Open WLED Detection

· Built-in Soft Start and Current Limit

· 16-pin, 3 mm ′ 3 mm QFN Package

APPLICATIONS

· Cellular Phones

· Portable Navigation Displays

· Multi-display Handheld Devices

DESCRIPTION

The TPS60255 is a high-efficiency, constant frequency charge pump DC/DC converter that uses

1′ and 1.5′ conversion to maximize efficiency for the

input voltage range. By using adaptive 1′/1.5′

charge-pump modes and very low dropout current

regulators, the TPS60255 achieves high efficiency for

the entire one-cell lithium battery range. The protection features include soft start, over-current

limit, thermal shut down, and over-voltage detection.

The device automatically detects and removes

unused current sinks from the control loop.

This device drives six 25 mA current sinks and one

80 mA current sink. These current regulators are programmed by three independent brightness

registers and five ON/OFF bits using a single-wire

interface (EasyScale?). This offers flexible

applications for a variety of lighting control in portable

devices.