AATIAN26 Datasheet, PDF (2/4 Pages) SiGe Semiconductor, Inc. – 850kHz 1A Buck Regulator

EV-103
AAT1152 EVAL
850kHz 1A Buck Regulator
Figure 2. AAT1152 Evaluation Board
PCB Top Side.
Figure 3. AAT1152 Evaluation Board
PCB Bottom Side.
Test Equipment
1. 6.0V 2.0A laboratory power supply: HP33401A or equivalent.
2. DC 0A to 1.0A load capable of operation down to 1.0V: Keithley 2400 or equivalent.
When using the Keithley 2400, set the meter to 0V in voltage source mode and set the load current by
varying the current compliance (maximum current) of the meter.
3. DC voltmeter: HP34401A or equivalent.
4. Oscilloscope: Tektronix TDS744A or equivalent.
Setup and Test
A: Load and Line Regulation (see connection diagram in Figure 4)
1. Apply a DC power supply and DC voltmeter across input voltage terminals: V_IN+ (positive terminal) and
GND (negative terminal or return).
2. Apply a DC load and DC voltmeter to output terminals: V_O+ and GND.
3. Vary the load from 0A to 1.0A and the input voltage from 2.7V to 5.5V while monitoring the output voltage.
4. The output voltage as measured at the output terminals of the evaluation board should not vary by more
than ±3% of the nominal voltage.
B: Short-Circuit and Over-Temperature Protection
1. Raise the input voltage to 5.5V
2. Apply a short from V_O+ to GND at the evaluation board terminals.
3. Remove the short and verify that output returns to its initial value.
C: Enable Input
1. Short the enable pin to GND. The output should decay to zero and the Power OK output should go low.
2. Remove the short applied to the enable pin. The output should recover to its initial value and the power
OK output should return to the input voltage.
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EV-103.2005.07.1.1