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Details, datasheet, quote on part number:PT6980
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Datasheet text preview:
PT6980 Series
10-A 12V-Input Dual Output Integrated Switching Regulator
SLTS154
Revised (10/2/2001)
Features
· 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
Description
The PT6980 ExcaliburTM series of power modules are dual output integrated switching regulators (ISRs) specifically designed to power mixed signal ICs. Operating from a 12-V input bus, the dual output provides power for both the digital I/O logic and a DSP core from a single module. Both output voltages are internally sequenced during power-up and powerdown to comply with the requirements of the latest DSP chips. Each output is independently adjustable or can be set to at least one alternative bus voltage with a simple pin-strap. The modules are made available in a space-saving solderable case. The features include output current limit and short-circuit protection.
Ordering Information
PT6981o = +2.5/1.8 Volts PT6982o = +3.3/2.5 Volts PT6983o = +3.3/1.8 Volts PT6984o = +3.3/1.2 Volts PT6985o = +2.5/1.2 Volts
Pin-Out Information
P i n Function
1 2 3 4 5 6 Vo1 Sense No Connect STBY V in V in V in GND GND GND GND GND Vo1
Pin
13 14 15 16 17 18 19 20 21 22 23
Function
Vo1 Vo1 Vo1 Vo1 Adjust * No Connect Vo2 Vo2 Vo2 Vo2 Vo2 Sense Vo2 Adjust *
PT Series Suffix (PT1234x)
Case/Pin Configuration Ver tical Horizontal SMD Order Suffix Package Code (ELF) (ELG) (ELH)
7 8 9 10 11 12
N A C
(Reference the applicable package code drawing for the dimensions and PC layout)
* Vo1 and Vo2 can be pin-strapped to another voltage.
See application note on output voltage adjustment.
Standard Application
V o 2 Sense STBY
3 22 1 18-21
V o 1 Sense
V IN
4,5,6
Vo 2 Vo 1
PT6980
12-15
+
7-11 16 23
C1
+
C2
C3
GND
GND
C1 = Req'd 560µF electrolytic C2 = Req'd 330µF electrolytic C3 = Optional 100µF electrolytic
For technical support and more information, see inside back cover or visit www.ti.com
PT6980 Series
10-A 12V-Input Dual Output Integrated Switching Regulator
General Specifications
Characteristic Short Circuit Current Switching Frequency Standby (Pin 3) Input High Voltage Input Low Voltage Input Low Current Standby Input Current External Output Capacitance Maximum Operating T mperature Range e Storage T mperature e Mechanical Shock Mechanical Vibration Weight Flammability
(Unless otherwise stated, Ta =25°C, Vin =12V) Symbol Isc o V IH V IL IIL Iin standby C2 C3 Ta Ts Conditions Io1 + Io2 combined Over Vin range Referenced to GND (pin 7) Min -- 500 -- 0.1 -- -- 330 (2) 0 40 (3) 40 -- -- --
PT6980 Series Typ Max
19 550 -- -- -0.5 4 -- -- -- -- 500 15 26 -- 600 Open (1) +0.4 6 15,000 (2) 330 +85 (4) +125 -- -- --
Units A kHz V mA mA µF °C °C G 's G 's grams
pin 3 to GND
Over Vin Range -- Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted Per Mil-STD-883D, Method 2007.2 20-2000 Hz, Soldered in a PC board Vertical/Horizontal Meets UL 94V-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. (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 and Vo1/Vo2 Loading
Power-up Sequencing The PT6980 series of regulators provide two output voltages, Vo1 and Vo 2. Each of the output voltage combinations offered by the PT6980 series provides power for both a lowvoltage 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 accompanying 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 25 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.
Figure 1; PT6980 Series Power-up
Vo1/Vo2 Loading The output voltages from the PT6980 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 Vo 2 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 PT6980 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:· Io 2 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 Vo1 Vo2 Adc
V1 (1V/Div)
V2 (1V/Div)
Vstby (10V/Div)
Consult the specification table for each model of the series for the actual numeric values.
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
PT6981
10.5-A 12V-Input Dual Output Integrated Switching Regulator
PT6981 Performance Specifications
Characteristic Output Current Symbol Io1 Io2 Io1 Io2 V in Vo tol Regtemp Regline Regload Votot Vr ttr Vtr
(Unless otherwise stated, T a =25°C, Vin =12V, C1 =560µF, C 2 =330µF, Io1 =Io1typ, and Io2 =Io 2typ) Conditions Ta =25°C, natural convection Ta =60°C, 200LFM airflow Over Io Range Vo1 Vo2 Vo1 Vo2 Vo1 Vo2 Vo1 Vo2 Vo1 Vo2 Vo1 Vo2 Vo1 Vo2 Vo1 (2.5V) Vo2 (1.8V) Vo1 (2.5V) Vo2 (1.8V) Min 0.1 0 0.1 0 10.8 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
PT6981 (2.5V/1.8V) Typ Max
(i) (i)
Units A A VDC mV %Vo mV mV mV % mVpp µs mV
Input Voltage Range Set Point Voltage T lerance o Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Efficiency Vo Ripple (pk-pk) Transient Response
40° >Ta > +85°C Over Vin range Over Io range Includes set-point, line, load 40° >Ta > +85°C 20MHz bandwidth 1A/µs load step, 50% to 100% Iotyp Vo over/undershoot
8 (ii) 2.5 (ii) 8 (ii) 2.5 (ii) -- ±12 ±9 ±0.5 ±0.5 ±10 ±5 ±10 ±5 ±44 ±28 80 35 35 60 ±50 ±20
10.5 (iii) 2.5 (iii) 10.5 (iii) 2.5 (iii) 13.2 ±38 ±27 -- -- ±15 ±7 ±15 ±7 -- -- -- -- -- -- -- --
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 Io 2 must be less than Io2max.
PT6981 Typical Characteristics
Efficiency vs Io1 (See Note A)
90 85 80 7 6
Power Dissipation vs Io 1 (See Note A)
Io2 (A) 0 .5 1 1 .5 2 2 .5 Pd - Watts
Io2 (A)
5 4 3 2 1 0
75 70 65 60 55 50 0 1 2 3 4 5 6 7 8
2 .5 2 1 .5 1 0 .5 0 .1
Efficiency - %
0
1
2
3
4
5
6
7
8
Io1 (A)
Io1 (A)
Vo1 Output Ripple vs Io1 (See Note A)
70 60 50 90 80
Safe Operating Area, V in =12V (See Note B)
Ambient Temperature (°C)
70 60 50 40 30 20
Air flow 200LFM 120LFM 60LFM Nat conv
Ripple - mV
40 30 20 10 0 0 1 2 3 4 5 6 7 8
0
1
2
3
4
5
6
7
8
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures
For technical support and more information, see inside back cover or visit www.ti.com
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