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AAT1152

850kHz 1A Buck DC/DC Converter

Advanced Analogic Technologies 

AAT1152

850kHz 1A Buck DC/DC Converter

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2V/div

VOUT

1V/div

IL

0.5A/div

Time (200μs/div)

Figure 1: Inrush Limit (VIN = 3.6V; VOUT = 1.5V; IL = 1A).

Current Limit and Over-Temperature

Protection

For overload conditions, the peak input current is

limited. Figure 2 displays the current limit charac-

teristics. 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.

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 (shown in

schematic Figures 3 and 4) filters the noise associ-

ated with power switching.

3.5

3

VCC = VP = 5.0V

2.5

VO = 3.3V

2

1.5

1

VCC = VP = 3.6V

VO = 1.5V

0.5

0

0

0.5

1

1.5

2

2.5

Output Current (A)

Figure 2: Current Limit Characteristics.

10

1152.2006.09.1.7

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