AAT2511

Dual 600mA, 1MHz Step-Down DC/DC Converter

8

2511.2006.05.1.4

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 AAT2511 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. 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 MOSFET power stage is sized for

600mA load capability with up to 97% efficiency.

Light load efficiency exceeds 80% at a 500µA load.