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PT6937 Datasheet(PDF) 2 Page - Texas Instruments |
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PT6937 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page For technical support and more information, see inside back cover or visit www.ti.com PT6935 Series 11-A 5V/3.3V-Input Dual Output Integrated Switching Regulator Power-up Sequencing and Vo1/Vo2 Loading Power-up Sequencing The PT6935 series of regulators provide two output voltages, Vo1 and Vo2. Each of the output voltage combinations offered by the PT6935 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 output voltages, Vo1 and Vo2, from the instance that either input power is applied or the module is enabled via the Standby pin. Following a delay of about 10 to 15 milli-secs, the voltages at Vo1 and Vo2 rise together until Vo2 reaches its set-point. Then Vo1 continues to rise until both output voltages have reached full voltage. Vo1/Vo2 Loading The output voltages from the PT6935 series regulators are independently regulated. The voltage at Vo1 is produced by a highly efficient switching regulator. The lower output voltage, Vo2, is derived from Vo1. The regulation method used for Vo2 also provides control of this output voltage during power-down. Vo2 will sink current if the voltage at Vo1 attempts to fall below it. The load specifications for each model of the PT6935 series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max) load current for each output. For operation within the product’s rating, the load currents at Vo1 and Vo2 must comply 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 some other value than the default output voltage, the absolute maximum load current for Io2 must be revised to comply with the following equation. Io2 (max) = 2.5 Adc Vo1 – Vo2 Consult the specification table for each model of the series for the actual numeric values. Figure 1; PT6935 Series Power-up V1 (1V/Div) V2 (1V/Div) Vstby (10V/Div) HORIZ SCALE: 5ms/Div General Specifications (Unless otherwise stated, Ta =25°C, Vin =5V) PT6935 Series Characteristic Symbol Conditions Min Typ Max Units Short Circuit Current Isc Io1 + Io2 combined — 17 — A Switching Frequency ƒo Over Vin range 300 350 400 kHz Standby (Pin 3) Referenced to GND (pin 7) Input High Voltage VIH — — Open (1) V Input Low Voltage VIL –0.1 — +0.4 Input Low Current IIL — -0.5 – mA Standby Input Current Iin standby pin 3 to GND — 7 25 mA External Output Capacitance C2 330 (2) — 3,300 (2) µF C3 0 — 330 MaximumOperating Ta Over Vin Range –40 (3) — +85 (4) °C TemperatureRange Storage Temperature Ts — –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 — 15 (5) —G’s 20-2000 Hz, Soldered in a PC board Weight — Vertical/Horizontal — 26 — grams Flammability — MeetsUL94V-O Notes: (1) The Standby (pin 3) has an internal pull-up, and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage is less than 15V. Refer to the application notes for interface considerations. (2) A value of 300µF is sufficient if Oscon® or low ESR tantalum type capacitors are used. The total combined ESR of all output capacitance at 100kHz must be (greater than) >12 m Ω, and (less or equal to) ≤150mΩ. (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. (5) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing. Input/Output Capacitors: The PT6935 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. Not Recommended For New Designs |
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