AAT2511 参数 Datasheet PDF下载

AAT2511

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

Functional Block Diagram

FB1

VIN1

Err.

Amp.

Comp.

DH

Logic

Voltage

Reference

LX1

DL

EN1

Control

Logic

GND1

SGND1

See

Note

VIN2

FB2

Err.

Amp.

Comp.

DH

LX2

Logic

DL

Voltage

Reference

EN2

See

Note

Control

Logic

GND2

SGND2

Note: Internal resistor divider included for

≥1.2V

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

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.

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2511.2006.02.1.2