For technical support and more information, see inside back cover or visit www.ti.com
PT6725 Series
14-A 12V-Input Adjustable
Integrated Switching Regulator
Specifications
Characteristic
Output Current
(Unless otherwise stated, T
a
=25°C, V
in
=12V, C
in
=1,000µF, C
out
=330µF, and I
o
=I
o
max)
Symbol
I
o
V
in
V
o
tol
Reg
temp
Reg
line
Reg
load
∆V
o
tot
η
Conditions
T
a
=+60°C, 200LFM
T
a
=+25°C, natural convection
Over I
o
Range
–40°
≤T
a
≤
+85°C, I
o
=I
o
min
Over V
in
range
Over I
o
range
Includes set-point, line, load,
–40°
≤T
a
≤
+85°C
I
o
=9.0A
V
o
≤2.5V
V
o
>2.5V
Min
0.1
(1)
0.1
(1)
10.8
—
—
—
—
—
V
o
=5.0V
V
o
=3.3V
V
o
=2.5V
V
o
=1.8V
V
o
=1.5V
V
o
=1.2V
—
—
—
—
—
—
—
—
—
—
300
—
–0.1
—
—
330
1,000
-40
(4)
-40
7.8
—
—
—
Materials meet UL 94V-0
PT6725 SERIES
Typ
Max
—
—
—
±1
±0.5
±5
±5
±2
93
90
87
84
81
78
35
70
±100
20
350
—
—
–0.5
0.5
—
—
—
—
—
500
15
(6)
23
14
13
13.2
±1.5
(2)
—
±10
±10
±3
—
—
—
—
—
—
—
—
—
32
400
Open
(3)
+0.4
–
1.0
15,000
—
+85
(5)
+125
—
—
—
—
Units
A
VDC
%V
o
%V
o
mV
mV
%V
o
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
Short Circuit Threshold
Switching Frequency
Remote On/Off (Pin 2)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
External Output Capacitance
External Input Capacitance
Operating T
emperature Range
Storage T
emperature
Reliability
Mechanical Shock
Mechanical Vibration
Weight
Flammability
V
r
t
tr
∆V
tr
I
sc
threshold
ƒ
s
V
IH
V
IL
I
IL
I
in
standby
C
out
Cin
T
a
T
s
MTBF
—
—
—
—
20MHz bandwidth
5A/µs load step, 50% to 100% I
o
max
V
o
over/undershoot
Over V
in
and I
o
range
Referenced to –V
in
(pin 8)
mV
pp
µs
mV
A
kHz
V
mA
mA
µF
µF
°C
°C
10
6
Hrs
G’s
G’s
grams
pins 2 & 8 connected
See application schematic
See application schematic
Over V
in
range
—
Per Bellcore TR-332
50% stress, T
a
=40°C, ground benign
Per Mil-Std-883D, method 2002.3,
1ms, half-sine, mounted to a fixture
Mil-Std-883D, Method 2007.2,
20-2000Hz, soldered in PCB
Notes:
(1) The ISR will operate at no load with reduced specifications.
(2) If the remote sense feature is not being used, connect the Remote Sense Gnd (pin 7) to GND (pin 8) for optimum output voltage accuracy.
(3) The STBY* control (pin 2) 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 typically the input voltage, Vin. Refer to the application notes for other interface considerations.
(4) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. See application notes.
(5) See Safe Operating Area curves or contact the factory for the appropriate derating.
(6) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
Input/Output Capacitors:
For proper operation in all applications, the PT6725 series requires a 1,000µF input capacitor (C
in
) with a minimum 1.6Arms ripple current
rating. And a 330µF output capacitor (C
out
) with a maximum ESR of 50m
Ω
at 100kHz. For transient or dynamic load applications, additional output capacitance may be
necessary. The maximum allowable output capacitance is 15,000µF. For more information consult the related application note on capacitor recommendations.
Input Inductor:
An input filter inductor is optioinal for most applications. The inductor must be sized to handle 6.5ADC with a typical value of 1µH.
For technical support and more information, see inside back cover or visit www.ti.com
PT6725 Series
14-A 12V-Input Adjustable
Integrated Switching Regulator
Typical Characteristics
Characteristic Data; V
in
=12V
Efficiency vs Output Current
100
(See Note A)
Safe Operating Area; V
in
=12V
(See Note B)
PT6724, V
o
=5.0V
90
80
V
OUT
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
Ambient Temperature (°C)
90
70
60
50
40
30
Airflow
200LFM
120LFM
60LFM
Nat Conv
Efficiency - %
80
70
60
50
0
2
4
6
8
10
12
14
20
0
2
4
6
8
10
12
14
Iout (A)
Iout (A)
Output Ripple vs Output Current
60
90
80
50
PT6725, V
o
=3.3V
V
OUT
40
Ambient Temperature (°C)
30
20
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
70
60
50
40
30
20
Airflow
200LFM
120LFM
60LFM
Nat Conv
Ripple - mV
10
0
0
2
4
6
8
10
12
14
0
2
4
6
8
10
12
14
Iout (A)
Iout (A)
Power Dissipation vs Output Current
10
90
80
PT6726, V
o
=2.5V
V
OUT
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
Ambient Temperature (°C)
8
70
60
50
40
30
Airflow
200LFM
120LFM
60LFM
Nat Conv
Pd - Watts
6
4
2
0
0
2
4
6
8
10
12
14
20
0
2
4
6
8
10
12
14
Iout (A)
Iout (A)
PT6729, V
o
=1.2V
90
80
Ambient Temperature (°C)
70
60
50
40
30
20
0
2
4
6
8
10
12
14
Airflow
200LFM
120LFM
60LFM
Nat Conv
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
Application Notes
PT6721/22 & PT6725 Series
Capacitor Recommendations for the 12V-Input
PT6721/22 and PT6725 Series of ISRs
Input Capacitors
The recommended input capacitor(s) is determined by
1.6Arms minimum ripple current rating and 1,000µF mini-
mum capacitance. Ripple current and Equivalent Series
Resistance (ESR) values are the major considerations along
with temperature when selecting the proper capacitor.
The tantalum capacitors listed below cannot be used on
the input bus since they are not rated for 12V operation.
Output Capacitors
The minimum required output capacitance is 330µF with a
maximum ESR less than or equal to 50mΩ. Failure to
observe this requirement may lead to regulator instability
or oscillation. Electrolytic capacitors have poor ripple
performance at frequencies greater than 400kHz, but
excellent low frequency transient response. Above the
ripple frequency ceramic decoupling capacitors are nec-
essary to improve the transient response and reduce any
microprocessor high frequency noise components apparent
during higher current excursions. Preferred low ESR type
capacitor part numbers are identified in the Table 1 below.
Tantalum Characteristics
Tantalum capacitors are recommended on the output bus
but only AVX TPS Series, Sprague 593D/594/595 Series,
or Kemet T495/T510 Series. These capacitors are recom-
mended over other types due to their higher surge current,
excellent power dissipation and ripple current ratings. As a
caution, the TAJ Series by AVX is not recommended. This
series exhibits considerably higher ESR, reduced power
dissipation and lower ripple current capability. The TAJ
Series is also less reliable compared to the TPS series when
determining power dissipation capability.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple cur-
rent (rms) ratings. The suggested minimum quantities
per regulator for both the input and output buses are
identified.
This is not an extensive capacitor list. Capacitors from
other vendors are available with comparable specifications.
Those listed are for guidance. The RMS ripple current rating
and ESR (Equivalent Series Resistance at 100kHz) are the
critical parameters are necessary to insure both optimum
regulator performance and long capacitor life.
Table 1 Capacitors Characteristic Data
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Panasonic
FC (Radial)
35V
25V
25V
50V
25V
35V
35V
35V
16V
35V
25V
35V
10V
10V
10V
10V
10V
10V
10V
Value(µF)
(ESR) Equivalent
Series Resistance
0.043
Ω
0.038
Ω
0.038
Ω
0073
Ω
0.038
Ω
0.043
Ω
0.034
Ω
0.038
Ω
0.084
Ω÷
2 =0.042
Ω
0.036
Ω
0.039
Ω
0.034
Ω
0.025
Ω
0.020
Ω
0.1
Ω÷
2 =0.05
Ω
0.06
Ω÷
2 =0.03
Ω
0.033
Ω
0.07
Ω÷
2 =0.035
Ω
0.045
Ω
105°C Maximum
Ripple
Current(Irms)
1655mA
1655mA
1690mA
1610mA
2000mA
1690mA
1690mA
1630mA
825mA (
×
2)
1660mA
1600mA
1770mA
3500mA
3800mA
>2500mA
>3000mA
1400mA
>2000mA
2360mA
Physical
Size(mm)
12.5
×
20
12.5
×
20
16
×
15
16
×
16.5
18
×
16.5
16
×
16.5
12.5
×
25
16
×
20
10
×
16
12.5
×
25
18
×
15
16
×
20
10
×
10.5
10.3
×
10.3
7.3L
×
5.7W
×
4.1H
4.3W
×
7.3L
×
4.0H
7.2L
×
6W
×
4.1H
Input
Bus
2
1
1
1
1
2
2
1
2
2
1
1
N/R(1)
N/R(1)
N/R(1)
N/R(1)
N/R(1)
N/R(1)
N/R(1)
Output
Bus
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
1
Vendor Part Number
680
1000
1000
1000
1000
470
680
1000
470
680
1200
1000
330
330
330
330
330
220
330
EEUFC1V681
EEUFC1E102
EEUFC1E102S
EEVFK1H102M
EEVFC1E102N
EEVFC1V471N
LXV35VB680M12X25LL
LXV35VB102M16X20LL
LXV16VB471M10X16LL
UPL1V681MHH
UPL1E122MHH6
UPM1V102MHH6
10SS330M (V
o
<5V)
10SV330 (V
o
<5V)
TPSE337M010R0100
TPSV337M010R0060
510X337M010AS
T495X227M0100AS
594D337X0010R2T
FC/FK (Surface Mount)
United Chemi-con
LXV Series
Nichicon
PL Series
PM Series
Os-con:
SS
SV (surface Mount)
AVX Tantalum
TPS (Surface Mount)
Kemet Tantalum
T510/T495 Series
(Surface Mount)
Sprague Tantalum
594D Series
(Surface Mount)
Note:
(N/R -Not recommended) The 10V-rated tantalum capacitors cannot be used on the input bus.
For technical support and more information, see inside back cover or visit www.ti.com
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