PT6980 Datasheet, PDF (2/12 Pages) Texas Instruments – 10-A 12V-Input Dual Output Integrated Switching Regulator

PT6980 Series
10-A 12V-Input Dual Output
Integrated Switching Regulator
General Specifications (Unless otherwise stated, Ta =25°C, Vin =12V)
Characteristic
Symbol
Conditions
PT6980 Series
Min
Typ
Max
Units
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
Temperature Range
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
Flammability
Isc
ƒo
V_IH
VIL
IIL
Iin standby
C2
C3
T_a
Ts
—
—
Io1 + Io2 combined
Over Vin range
Referenced to GND (pin 7)
pin 3 to GND
Over V_in 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
—
19
500
550
—
—
–0.1
—
—
-0.5
—
4
330 (2)
—
0
—
–40 (3)
—
–40
—
—
500
—
15
—
26
—
A
600
kHz
Open (1)
+0.4
V
–
mA
6
mA
15,000 (2)
330
µF
+85 (4)
°C
+125
°C
—
G ’s
—
G ’s
—
grams
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 mΩ.
(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 Vo₂. Each of the output voltage combinations
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
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
V1 (1V/Div)
V2 (1V/Div)
Vstby (10V/Div)
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 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 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:-
• 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.
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com