AATIAN25 Datasheet, PDF (2/5 Pages) SiGe Semiconductor, Inc. – 850kHz 700mA Buck Regulator

EV-109
AAT1151 QFN EVAL
850kHz 700mA Buck Regulator
Figure 2: AAT1151 QFN Evaluation
Board PCB Top Side.
Figure 3: AAT1151 QFN Evaluation
Board PCB Bottom Side.
Test Equipment
1. 6.0V, 1.0A laboratory power supply: HP33401A or equivalent.
2. DC 0A to 700 mA electronic load, capable of operation down to 1.0V: Keithley 2400 or equivalent. (When
using the Keithley 2400, set the meter to operate 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 0.7A 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 boards 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 the output returns to its initial value.
C. Enable Input
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.
2
EV-109.2005.04.1.1