AAT2510

Dual 400mA, 1MHz Step-Down DC-DC Converter

8

2510.2005.08.1.5

Functional Block Diagram

Note: Internal resistor divider included for

≥1.2V versions. For low voltage versions, the feedback pin is tied directly to the error amplifier input.

EN1

LX1

Err.

Amp.

DH

DL

GND1

VIN1

FB1

SGND2

Voltage

Reference

Control

Logic

EN2

LX2

Err.

Amp.

DH

DL

GND2

Comp.

Logic

Logic

Control

Logic

VIN2

FB2

SGND1

Voltage

Reference

Comp.

See

Note

See

Note

Operation

Device Summary

The AAT2510 is a constant frequency peak current

mode PWM converter with internal compensation.

Each channel has independent input, enable, feed-

back, and ground pins with non-synchronized

1MHz clocks.

Both converters are designed to operate with an

input voltage range of 2.7V to 5.5V. The output

voltage ranges from 0.6V to the input voltage for

the internally fixed version and up to 2.5V for the

externally adjustable version. The 0.6V fixed model

shown in Figure 1 is also the adjustable version

and is externally programmable with a resistive

divider as shown in Figure 2. The converter MOS-

FET power stage is sized for 400mA load capabili-

ty with up to 96% efficiency. Light load efficiency

exceeds 80% at a 500µA load.