Datasheet

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PIN ASSIGNMENT

PTH04000W

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PTH04000W

SLTS247B – JUNE 2005 – REVISED OCTOBER 2007

TERMINAL FUNCTIONS

TERMINAL

I/O DESCRIPTION

NAME NO.

This is the common ground connection for the V

and V

power connections. It is also the 0 V

GND 1

reference for the Inhibit , the V

Adjust, and the Track control inputs.

This is an analog control input that enables the output voltage to follow an external voltage. This pin

becomes active typically 20 ms after the input voltage has been applied, and allows direct control of the

output voltage from 0 V up to the nominal set-point voltage. Within this range the output voltage follows

the voltage at the Track pin on a volt-for-volt basis. When the control voltage is raised above this range,

the module regulates at its set-point voltage. The feature allows the output voltage to rise

Track 2 I

simultaneously with other modules powered from the same input bus. If unused, this input should be

connected to V

NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input

voltage during power up. For more information, see the related application report (SLTA054).

3 I The positive input voltage power node to the module, which is referenced to common GND.

The Inhibit pin is an open-collector/drain-negative logic input that is referenced to GND. Applying a

low-level ground signal to this input disables the module's output. When the Inhibit control is active, the

Inhibit 4 I

input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the

module produces an output voltage whenever a valid input source is applied.

A 1% resistor must be connected between this pin and GND (pin 1) to set the output voltage of the

module higher than 0.9 V. If left open-circuit, the output voltage defaults to this value. The temperature

Adjust 5 I stability of the resistor should be 100 ppm/ ° C (or better). The set-point range is from 0.9 V to 3.6 V. The

electrical specification table gives the standard resistor value for a number of common output voltages.

See the application information for further guidance.

6 O The regulated positive power output with respect to the GND node.

Product Folder Link(s): PTH04000W