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PT6984A_1188760 datasheet and pdf

? Dual Outputs(See Ordering Information)? Ideal Power Source for DSPs? 12V Input? Outputs Adjustable? Remote Sensing (Vo1 & Vo2)? Standby Function? Soft-Start? Internal Sequencing? Short Circuit Protection? 23-pin Space-Saving Package? Solderable Copper Case

The PT6980 Excalibur? series ofpower modules are dual output integratedswitching regulators (ISRs) specificallydesigned to power mixed signal ICs.Operating from a 12-V input bus, the dual
output provides power for both the digitalI/O logic and a DSP core from a singlemodule. Both output voltages are internallysequenced during power-up and power-down to comply with the requirements ofthe latest DSP chips. Each output is inde-endently adjustable or can be set to at
least one alternative bus voltage with asimple pin-strap. The modules are madeavailable in a space-saving solderable case.The features include output current limitand short-circuit protection.

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?.
(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.

Power-up Sequencing
The PT6980 series of regulators provide two output voltagesVo1 and Vo2. Each of the output voltage combinationsoffered by the PT6980 series provides power for both a low-voltage processor core, and the associated digital supportcircuitry. In addition, each output is internally sequencedduring power-up and power-down to comply with therequirements of most DSP and μP IC’s, and their accompa-nying chipsets. Figure 1 shows the typical waveforms of the
output voltages, Vo1 and Vo2, from the instance that eitherinput power is applied or the module is enabled via theStandby pin. Following a delay of about 25 milli-secs, thevoltages at Vo1 and Vo2 rise together until Vo2 reaches itsset-point. Then Vo1 continues to rise until both outputvoltages have reached full voltage.

Vo1/Vo2 Loading
The output voltages from the PT6980 series regulators areindependently regulated. The voltage at Vo1 is producedby a highly efficient switching regulator. The lower outputvoltage, Vo2, is derived from Vo1. The regulation methodused for Vo2 also provides control of this output voltageduring power-down. Vo2 will sink current if the voltage atVo1 attempts to fall below it.The load specifications for each model of the PT6980series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max)
load current for each output. For operation within theproduct’s rating, the load currents at Vo1 and Vo2 mustcomply with the following limits:-?Io2 must be less than Io2(max).? The sum-total current from both outputs (Io1 + Io2)must not exceed Io1(max).In the case that either Vo1 or Vo2 are adjusted to someother value than the default output voltage, the absolutemaximum load current for Io2 must be revised to complywith the following equation.

Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.
(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io1 and Io2 must be less than Io1max, and Io2 must be less than Io2max.

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