1
Introduction
2
Setup
2.1
Input / Output Connector Descriptions
2.1.1
J1 –VIN
2.1.2
J2 –VOUT
2.1.3
J3 – GND
2.1.4
J4 – GND
2.1.5
J5 – ENABLE
2.1.6
J6 – Output Voltage Selection
Introduction
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The TPS79801DCQEVM-434 evaluation module (EVM) helps designers evaluate the operation and
performance of the TPS79801 low-dropout (LDO) linear regulator in the SOT223-5 package. The
TPS79801 is a 50-mA, micropower, linear regulator.
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the TPS79801EVM.
This is the positive input supply voltage. Twist the leads to the input supply, and keep them as short as
possible to minimize EMI transmission. Add bulk capacitance between J1 and J3 if the supply leads are
greater than six inches. An additional 47-
µ
F or greater capacitor improves the transient response of the
TPS79801 and helps to reduce ringing on the input when long supply wires are used.
This is the positive connection from the output. Connect this pin to the positive input of the load.
This is the return connection for the input power supply of the regulator.
This is the return connection for the output.
This jumper is used to enable or disable the output of the TPS79801. Placing a shorting jumper between
pins 1 and 2 (ON position) enables the TPS79801. Placing the shorting jumper between pins 2 and 3
(OFF position) disables the TPS79801.
This jumper is used to select the output voltage of the TPS79801. The jumper selects different feedback
resistors to change the output voltage setting. The output voltage is set by inserting a shorting jumper
across two pins of J6. The preprogrammed output voltages are configured as shown in
Table 1. Output Voltage Setting
Output Voltage
Jumper Between Pins
12
1 and 2
5
3 and 4
3.3
5 and 6
2.5
7 and 8
TPS79801DCQEVM-434
2
SLUU346 – June 2009
