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PIN ASSIGNMENT

PTH08000W

(Top View)

1

5

2

3

4

6

PTH08000W

SLTS248 – JUNE 2005

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

GND

1

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

Track

2

I

its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules powered

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

during power up. For more information, consult the related application note literature number 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 input current

Inhibit

4

I

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 stability of the

5

I

resistor should be 100 ppm/°C (or better). The set-point range is from 0.9 V to 5.5 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.

4