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AAT1152

850kHz 1A Synchronous Buck DC/DC Converter

Analog Technology Inc 

AAT1152

850kHz 1A Synchronous Buck DC/DC Converter

Enable

2V/div

VOUT

1V/div

IL

0.5A/div

VIN=3.6V

VOUT=1.5V

IL=1A

200µsec/div

Figure 1: Inrush Limit

Power and Signal Source

Separate small signal ground and power supply

pins isolate the internal control circuitry from the

noise associated with the output MOSFET switch-

ing. The low pass filter R1 and C3 in schematic fig-

ures 3 and 4 filters the noise associated with the

power switching.

Current Limit and Over-temperature

protection

For overload conditions the peak input current is

limited. Figure 2 displays the VI current limit char-

acteristics. As load impedance decreases and the

output voltage falls closer to zero, more power is

dissipated internally, raising the device tempera-

ture. Thermal protection completely disables

switching when internal dissipation becomes

excessive, protecting the device from damage. The

junction over-temperature threshold is 140°C with

15°C of hysteresis.

Current Limit Characteristic

3.5

3

VCC =VP = 5.0V

2.5

VO = 3.3V

Figure 4 schematic

2

1.5

1

VCC =VP =3.6V

VO = 1.5V

0.5

Figure 3 schematic

0

0

0.5

1

1.5

2

2.5

IOUT (A)

Figure 2.

10

1152.2003.01.0.9

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