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PT6980 Series

10-A 12V-Input Dual Output

Integrated Switching Regulator

Power-up Sequencing

The PT6980 series of regulators provide two output voltages,

offered by the PT6980 series provides power for both a low-

voltage processor core, and the associated digital support

circuitry. In addition, each output is internally sequenced

during power-up and power-down to comply with the

requirements of most DSP and µP IC’s, and their accompa-

nying chipsets. Figure 1 shows the typical waveforms of the

input power is applied or the module is enabled via the

Standby pin. Following a delay of about 25 milli-secs, the

voltages have reached full voltage.

The output voltages from the PT6980 series regulators are

by a highly efficient switching regulator. The lower output

The load specifications for each model of the PT6980

series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max)

load current for each output. For operation within the

comply with the following limits:-

other value than the default output voltage, the absolute

with the following equation.

=

2.5

Adc

Consult the specification table for each model of the series

for the actual numeric values.

Figure 1; PT6980 Series Power-up

PT6980 Series

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

Short Circuit Current

—

19

—

A

Switching Frequency

500

550

600

kHz

Standby (Pin 3)

Referenced to GND (pin 7)

Input High Voltage

—

—

V

Input Low Voltage

–0.1

—

+0.4

Input Low Current

—

-0.5

–

mA

Standby Input Current

pin 3 to GND

—

4

6

mA

External Output Capacitance

—

µF

0

—

330

MaximumOperating

—

°C

TemperatureRange

Storage Temperature

—

–40

—

+125

°C

Mechanical Shock

Per Mil-STD-883D, Method 2002.3

1msec,½Sine,mounted

—

500

—

G’s

Mechanical Vibration

Per Mil-STD-883D, Method 2007.2

20-2000 Hz, Soldered in a PC board

—

15

—

G’s

Weight

—

Vertical/Horizontal

—

26

—

grams

Flammability

—

MeetsUL94V-O

Notes:

(1) The Standby (pin 3) has an internal pull-up to Vin, and if it is left open circuit the module will operate when input power is applied.Refer to the application

notes for interface considerations.

(2) The total combined ESR of all output capacitance at 100kHz must be (less than) <50 m

Ω.

(3) For operating temperatures below 0°C, Cin and Cout must have stable characteristics. Use either tantalum or Oscon® capacitors.

(4) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating.

Input/Output Capacitors: The PT6980 series requires a 330µF electrolytic capacitor at both the input and output for proper operation (300µF for Oscon® or low ESR

tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance

may be required. Refer to the application notes for more information.

V1 (1V/Div)

V2 (1V/Div)

HORIZ SCALE: 5ms/Div

Vstby (10V/Div)