800KHz Synchronous Step-up

Converter with 5.5A Switches

EC3689

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4E02N-Rev.P001

Figure 1. EC3689 Typical Application Circuit

General Description

The EC3689 devices provide a power supply solution for

products powered by either a one-cell Li-Ion or Li-polymer

battery. The converter generates a stable output voltage

that is either adjusted by an external resistor divider or

fixed internally on the chip. It provides high efficient power

conversion and is capable of delivering output currents up

to 2.1A at 5.3V at a supply voltage down to 2.9V. The

maximum peak current in the step-up switch is limited to a

value of 5.5A. The EC3689 operates at 800KHz switching

frequency and enters pulse-skip-mode (PSM) operation at

light load currents to maintain high efficiency over the

entire load current range. During shutdown, the load is

completely disconnected from the battery.

Features

◆ Synchronous Step-up Converter with 2.1A Output

Current From 2.9V Input

◆ Input Under-voltage Lockout Protection

◆ Fixed and Adjustable Output Voltage

◆ Built-in Output Over-voltage Protection

◆ Light-Load Pulse Skip Mode

◆ Load Disconnect During Shutdown

◆ Output Short Circuit Protection

◆ Thermal Shutdown Protection

◆ Available in a SOP8(Exposed PAD) Packages

APPLICATIONS

◆ Power Bank

◆ USB Charging Port (5V)

◆ DC/DC Micro Modules