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| AATIAN22 Datasheet, PDF (9/11 Pages) SiGe Semiconductor, Inc. – 3MHz Fast Transient 400mA Step-Down Converter | |||
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EV-139
AAT1149 EVAL: 3MHz Fast Transient
400mA Step-Down Converter
Test: RDS(ON)H and RDS(ON)L
1. Configure the specified test equipment as shown in Figure 8.
2. Enable UUT by connecting the jumper to the âONâ position, and connect the FB pin to GND to turn-on the
high side PMOS and turn-off the low side NMOS.
3. Connect 4 wires (Force and Sense) from the Keithley power supply between VIN and LX node. Set the
compliance to VSRC = 40mV at ICOMP = 300mA.
4.
Power
up
and
measure
RDS(ON)H
=
VSRC
ICOMP
5. To measure the RDS(ON)L, repeat steps 2 through 4 with the FB pin connected to VCC (to turn on the low
side NMOS) and connect the 4 wires (Force and Sense) between LX and GND.
RDS(ON)L
=
VSRC
ICOMP
Figure 8: AAT1149 Schematic Connection Diagram for RDS(ON).
EV-139.2007.08.1.0
9
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