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
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
emperature Range
Storage T
emperature
Mechanical Shock
Mechanical Vibration
Weight
Flammability
(Unless otherwise stated, T
a
=25°C, V
in
=5V)
Symbol
I
sc
ƒ
o
V
IH
V
IL
I
IL
I
in
standby
C
2
C
3
T
a
T
s
Conditions
Io
1
+ Io
2
combined
Over V
in
range
Referenced to GND (pin 7)
Min
—
300
—
–0.1
—
—
330
(2)
0
–40
(3)
–40
—
—
—
PT6935 Series
Typ
Max
17
350
—
—
-0.5
7
—
—
—
—
500
15
(5)
26
—
400
Open
(1)
+0.4
–
25
3,300
(2)
330
+85
(4)
+125
—
—
—
Units
A
kHz
V
mA
mA
µF
°C
°C
G’
s
G’
s
grams
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
—
—
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)
≤
150m
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.
(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.
Power-up Sequencing and Vo
1
/Vo
2
Loading
Power-up Sequencing
The PT6935 series of regulators provide two output voltages,
Vo
1
and Vo
2
. 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, Vo
1
and Vo
2
, 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 Vo
1
and Vo
2
rise together until Vo
2
reaches
its set-point. Then Vo
1
continues to rise until both output
voltages have reached full voltage.
Figure 1; PT6935 Series Power-up
Vo
1
/Vo
2
Loading
The output voltages from the PT6935 series regulators are
independently regulated. The voltage at Vo
1
is produced
by a highly efficient switching regulator. The lower output
voltage, Vo
2
, is derived from Vo
1
. The regulation method
used for Vo
2
also provides control of this output voltage
during power-down. Vo
2
will sink current if the voltage at
Vo
1
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 Vo
1
and Vo
2
must
comply with the following limits:-
• Io
2
must be less than Io
2
(max).
• The sum-total current from both outputs (Io
1
+ Io
2
)
must not exceed Io
1
(max).
In the case that either Vo
1
or Vo
2
are adjusted to some
other value than the default output voltage, the absolute
maximum load current for Io
2
must be revised to comply
with the following equation.
Io
2
(max)
=
2.5
Vo
1
– Vo
2
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
PT6935
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6935 Performance Specifications
Characteristic
Output Current
Symbol
Io
1
Io
2
Io
1
Io
2
V
in
V
o
tol
Reg
temp
Reg
line
Reg
load
∆V
o
tot
η
V
r
t
tr
∆V
tr
(Unless otherwise stated, T
a
=25°C, V
in
=5V, C
1
=330µF, C
2
=330µF, Io
1
=Io
1
typ, and Io
2
=Io
2
typ)
Conditions
T
a
=25°C, natural convection
T
a
=60°C, 200LFM airflow
Over I
o
Range
Vo
1
Vo
2
–40° >T
a
> +85°C
Over V
in
range
Over I
o
range
Includes set-point, line, load,
–40° >T
a
> +85°C
20MHz bandwidth
1A/µs load step, 50% to 100% I
o
typ
V
o
over/undershoot
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
(2.5V)
Vo
2
(1.8V)
Vo
1
(2.5V)
Vo
2
(1.8V)
Min
0.1
0
0.1
0
3.1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
PT6935 (2.5V/1.8V)
Typ
Max
(i)
(i)
Units
A
A
VDC
mV
%V
o
mV
mV
mV
%
mV
pp
µs
mV
Input Voltage Range
Set Point Voltage T
olerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Efficiency
V
o
Ripple (pk-pk)
Transient Response
7
(ii)
2.5
(ii)
7
(ii)
2.5
(ii)
—
±12
±9
±0.5
±5
±2
±5
±5
±34
±25
79
35
35
60
±60
±60
9.5
(iii)
3.5
(iii)
10
(iii)
3.5
(iii)
5.5
±38
±27
—
±10
±5
±10
±10
—
—
—
—
—
—
—
—
Notes:
(i) Io
1
(min) current of 0.1A can be divided between both outputs, Vo
1
or Vo
2
. 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 Io
1
and Io
2
must be less than Io
1
max, and Io
2
must be less than Io
2
max.
PT6935 Typical Characteristics
Efficiency vs Io
1
(See Note A)
85
10
Power Dissipation vs Io
1
(See Note A)
80
8
Efficiency - %
75
Pd - Watts
V
IN
3.3V
5.0V
70
V
IN
6
5.0V
3.3V
4
65
2
60
0
1
2
3
4
5
6
7
0
0
1
2
3
4
5
6
7
Io
1
(A) [ Io
2
fixed at Io
2
(typ) ]
Io
1
(A) [ Io
2
fixed at Io
2
(typ) ]
Vo
1
Output Ripple vs Io
1
(See Note A)
70
60
50
90
80
Safe Operating Area, V
in
=5V
(See Note B)
Ambient Temperature (°C)
70
60
50
40
30
20
Ripple - mV
V
IN
40
30
20
10
0
0
1
2
3
4
5
6
7
Airflow
200LFM
120LFM
60LFM
Nat conv
5.0V
3.3V
0
1
2
3
4
5
6
7
Io
1
(A) [ Io
2
fixed at Io
2
(typ) ]
Iout (A)
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
PT6936
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6936 Performance Specifications
Characteristic
Output Current
Symbol
Io
1
Io
2
Io
1
Io
2
V
in
V
o
tol
Reg
temp
Reg
line
Reg
load
∆V
o
tot
η
V
r
t
tr
∆V
tr
(Unless otherwise stated, T
a
=25°C, V
in
=5V, C
1
=330µF, C
2
=330µF, Io
1
=Io
1
typ, and Io
2
=Io
2
typ)
Conditions
T
a
=25°C, natural convection
T
a
=60°C, 200LFM airflow
Over I
o
Range
Vo
1
Vo
2
–40° >T
a
> +85°C
Over V
in
range
Over I
o
range
Includes set-point, line, load,
–40° >T
a
> +85°C
20MHz bandwidth
1A/µs load step, 50% to 100% I
o
typ
V
o
over/undershoot
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
Vo
2
Vo
1
(3.3V)
Vo
2
(2.5V)
Vo
1
(3.3V)
Vo
2
(2.5V)
Min
0.1
0
0.1
0
4.5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
(i)
(i)
PT6936 (3.3V/2.5V)
Typ
Max
8
(ii)
3
(ii)
8
(ii)
3
(ii)
—
±16
±12
±0.5
±5
±2
±5
±5
±29
±34
81
35
35
60
±60
±60
11
3
11
3
5.5
±50
±38
—
±10
±5
±10
±10
—
—
—
—
—
—
—
—
(iii)
(iii)
(iii)
(iii)
Units
A
A
VDC
mV
%V
o
mV
mV
mV
%
mV
pp
µs
mV
Input Voltage Range
Set Point Voltage T
olerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Efficiency
V
o
Ripple (pk-pk)
Transient Response
Notes:
(i) Io
1
(min) current of 0.1A can be divided between both outputs, Vo
1
or Vo
2
. 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 Io
1
and Io
2
must be less than Io
1
max, and Io
2
must be less than Io
2
max.
PT6936 Typical Characteristics
Efficiency vs Io
1
(See Note A)
85
10
Power Dissipation vs Io
1
(See Note A)
80
8
Efficiency - %
Pd - Watts
75
V
IN
5.0V
6
V
IN
5.0V
70
4
65
2
60
0
1
2
3
4
5
6
7
8
0
0
1
2
3
4
5
6
7
8
Io
1
out (A) [ Io
2
fixed at Io
2
(typ) ]
Io
1
out (A) [ Io
2
fixed at Io
2
(typ) ]
Vo
1
Output Ripple vs Io
1
(See Note A)
70
60
90
80
Safe Operating Area, V
in
=5V
(See Note B)
Ambient Temperature (°C)
50
70
60
50
40
30
20
Airflow
200LFM
120LFM
60LFM
Nat conv
Ripple - mV
40
30
20
10
0
0
1
2
3
4
5
6
7
8
V
IN
5.0V
0
1
2
3
4
5
6
7
8
Io
1
out (A) [ Io
2
fixed at Io
2
(typ) ]
Io
1
(A) [ Io
2
fixed at Io
2
(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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