AATIAN19 Datasheet, PDF (3/6 Pages) SiGe Semiconductor, Inc. – AAT1145 EVAL:1.5 MHz, 1.2A Step-Down

EV136
AAT1145 EVAL:1.5 MHz, 1.2A Step-Down
DC/DC Converter with Low Quiescent Current
Test Equipment
1 8.0V 5.0A laboratory power supply: Agilent E3648A or equivalent.
2. Electronic load: Agilent N3301A
3. DC voltmeter: Agilent 34401A or equivalent.
4. Oscilloscope: Tektronix TDS3034B or equivalent.
Setup and Test (see connection diagram in Figure 5)
A: Load and Line Regulation
1. Apply a DC power supply and DC voltmeter across the input voltage terminals: VIN (positive terminal) and
GND (negative terminal or return).
2. Apply a DC load and DC voltmeter to the output terminals: VOUT and GND.
3. Before turning on the supply, set the jumper to the side labeled “Enable”.
4. Vary the load from 0 to 1.2A and the input voltage from 2.5V to 5.5V while monitoring the output voltage.
5. The output voltage as measured at the output terminals of the evaluation boards should not vary by more
than ±3% of the nominal voltage.
B: Ripple and Shutdown Current
1. Set the output load current between 0A and 1.2A, and measure the output ripple voltage; the measure-
ment should be less than 20 mVAC.
2. Apply 4.2V at VIN. Set the jumper from “Enable” state to GND. Measure the shutdown supply current. The
supply current will be less than 1µA.
C: Short-Circuit and Over-Temperature Protection
1. Raise the input voltage to 5.5V.
2. Apply a short from VOUT to GND at the evaluation board terminals.
3. Remove the short and verify that the output returns to its initial value.
D: Enable Output
1. Short the Enable pin to GND. The output should decay to zero.
2. Remove the short applied to the Enable pin. The output should recover to its initial value.
EV-136.2007.08.1.1
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