www.ti.com

DEVICE INFORMATION

PTHXX060

(Top View)

1

2

10 9

8

7

6

5

4

3

PTH12060W/L

SLTS217D–MAY 2003–REVISED OCTOBER 2005

Terminal Functions

TERMINAL

DESCRIPTION

NAME

NO.

2

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

6

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

GND

1, 7

control inputs.

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 and turns off the output voltage. When the Inhibit control is active,

Inhibit

3

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

produces an output whenever a valid input source is applied.

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

to a value higher than its lowest value. The temperature stability of the resistor should be 100 ppm/°C (or better).

The set-point range is 1.2 V to 5.5 V for W-suffix devices, and 0.8 V to 1.8 V for L-suffix devices. The resistor value

4

required for a given output voltage may be calculated using a formula. If left open circuit, the output voltage defaults

to its lowest value. For further information on output voltage adjustment, see the application information section.

Table 2 gives the preferred resistor values for a number of standard output voltages.

The sense input allows the regulation circuit to compensate for voltage drop between the module and the load. For

5

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

zero volts, up to the nominal set-point voltage. Within this range, the output follows the voltage at the Track pin on a

Track

8

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 simultaneously with other modules powered from the same input bus.

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 application information section.

When this input is asserted to GND, the output voltage is decreased by 5% from the nominal. The input requires an

Margin Down

9

open-collector (open-drain) interface. It is not TTL compatible. A lower percent change can be accommodated with

a series resistor. For further information, see the application information section.

When this input is asserted to GND, the output voltage is increased by 5%. The input requires an open-collector

Margin Up

10

(open-drain) interface. It is not TTL compatible. The percent change can be reduced with a series resistor. For

further information, see the application information section.

6