For technical support and more information, see inside back cover or visit www.ti.com
PT6440 Series
6-A 5-V/3.3-V Input Adjustable
Integrated Switching Regulator
Specifications
Characteristic
Output Current
(Unless otherwise stated, T
a
=25°C, V
in
=5V, C
in
=100µF, 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
Min
0.1
(1)
0.1
(1)
4.5
3.1
—
—
—
—
—
V
o
=3.3V
V
o
=2.5V
V
o
=2.0V
V
o
=1.8V
V
o
=1.5V
V
o
=1.2V
V
o
=1.0V
—
—
—
—
—
—
—
—
—
—
—
300
V
in
–0.5
–0.2
—
—
330
100
–40
(3)
–40
8.8
—
—
—
Materials meet UL 94V-0
PT6440 SERIES
Typ
Max
—
—
—
—
±1
±0.5
±6
±10
±2
91
89
85
85
81
80
78
20
50
±70
10
350
—
—
–0.5
+0.5
—
—
—
—
—
500
20
(5)
23
6
6
5.5
5.5
±2
(2)
—
±10
±25
±3
—
—
—
—
—
—
—
—
—
—
—
400
Open
(2)
+0.5
–
—
1,000
—
+85
(4)
+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
=
3.3V
V
o
≤
2.5V
–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
=4A
%
V
o
Ripple (pk-pk)
Transient Response
Short Circuit Threshold
Switching Frequency
Inhibit (Pin 1)
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
C
in
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 1 & 5 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) The Inhibit control (pin 1) 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 the input voltage V
in
. Use a discrete MOSFET to control the Inhibit pin, and ensure a transitioin time of less than
≤
10µs. Consult the related
application note for other interface considerations.
(3) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
(4) See Safe Operating Area curves or contact the factory for the appropriate derating.
(5) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information consult the applicable package outline drawing.
Input/Output Capacitors:
The PT6440 regulator series requires a 100µF electrolytic (or tantalum) capacitor at the input and 330µF at the output for proper
operation in all applications. In addition, the input capacitance, C
in
, must be rated for a minimum of 350mArms of ripple current, and the ESR of the output
capacitor, C
out
, must less than 100m
Ω
@100kHz. For transient or dynamic load applications additional output capacitance may be necessary. For more information
consult the related application note on capacitor recommendations.
For technical support and more information, see inside back cover or visit www.ti.com
PT6440 Series
6-A 5-V/3.3-V Input Adjustable
Integrated Switching Regulator
Typical Characteristics
PT6440 Series Performance; @V
IN
=5.0V
Efficiency Vs Output Current
100
(See Note A)
PT6440 Series Performance; @V
IN
=3.3V
Efficiency Vs Output Current
100
(See Note A)
90
90
80
70
PT6441
PT6442
PT6443
PT6444
PT6445
PT6446
PT6447
80
70
PT6442
PT6443
PT6444
PT6445
PT6446
PT6447
Efficiency - %
60
Efficiency - %
60
50
0
1
2
3
4
5
6
50
0
1
2
3
4
5
6
Iout (A)
Iout (A)
Ripple Vs Output Current
60
60
50
50
Ripple Vs Output Current
Ripple - mV
Ripple - mV
40
30
20
PT6446
PT6443
PT6444
PT6442
PT6445
PT6441
PT6447
40
30
20
PT6446
PT6447
PT6445
PT6444
PT6443
PT6442
10
10
0
0
1
2
3
4
5
6
0
0
1
2
3
4
5
6
Iout (A)
Iout (A)
Power Dissipation Vs Output Current
2.5
2.5
Power Disspiation Vs Output Current
2
2
Pd - Watts
1.5
1
PT6441/2
PT6443/4
PT6445/6
PT6447
Pd - Watts
1.5
1
PT6442/3/4
PT6445/6
PT6447
0.5
0.5
0
0
1
2
3
4
5
6
0
0
1
2
3
4
5
6
Iout (A)
Iout (A)
Safe Operating Area Curves
PT6440 Series, V
IN
=5.0V
90.0
80.0
(See Note B)
Safe Operating Area Curves
PT6440 Series, V
IN
=3.3V
90.0
80.0
(See Note B)
Ambient Temperature (°C)
70.0
60.0
50.0
40.0
30.0
20.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient Temperature (°C)
Airflow
200LFM
120LFM
60LFM
Nat conv
70.0
60.0
50.0
40.0
30.0
20.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Airflow
200LFM
120LFM
60LFM
Nat conv
Iout (A)
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
PT6440 Series
Capacitor Recommendations for the PT6440
Excalibur™ 5V/3.3V Bus Step-Down ISRs
Input Capacitors
The recommended input capacitance is determined by
350 milli-amperes (rms) minimum ripple current rating
and 100µF minimum capacitance. Capacitors placed at
the input must be rated for a minimum of twice the input
voltage with +5V operation. Ripple current and
≤200mΩ
Equivalent Series Resistance (ESR) values are the major
considerations, along with temperature, when selecting
the proper input capacitor.
Tanatalum Capacitors
Tantalum capacitors are recommended on the output bus
but only the AVX TPS series, Sprague 593D/594/595
series or Kemet T495/T510 series. These capacitors are
specified over many other types due to their higher surge
current, power dissipation and ripple current capability.
As a caution, the TAJ Series by AVX is not recommended.
This series exhibits considerably higher ESR and lower
ripple current capability. The TAJ series is also less reliable
than the TPS series when determining power dissipation
capability. Tantalum or Oscon® types are recommended
in applications where ambient temperatures fall below 0°C.
Output Capacitors
The ESR of the required 330µF output capacitor must
be less than or equal to 100mΩ. Failure to observe this
requirement may lead to regulator instability or oscillation.
Electrolytic capacitors have poor ripple performance at
frequencies greater than 300kHz but excellent low fre-
quency transient response. Above the ripple frequency,
ceramic decoupling capacitors are necessary to improve the
transient response and reduce any high frequency noise
components apparent during higher current excursions.
The preferred low ESR type capacitor part numbers are
identified in Table 1.
Capacitor Table
Table 1 identifies vendors with acceptable ESR and
maximum allowable ripple current (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 critical
parameters necessary to insure both optimum regulator perfor-
mance and long capacitor life.
Table 1; Input/Output Capacitors
Capacitor Vendor/
Component
Series
Capacitor Characteristics
Working
Voltage
(ESR) Equivalent
Series Resistance
0.065
Ω
0.117
Ω
0.090
Ω
0.15
Ω÷
2
0.40
Ω
0.065
Ω
0.084
Ω
0.090
Ω÷
2
0.025
Ω
0.040
Ω
0.065
Ω
0.090
Ω
0.17
Ω÷
2
0.025
Ω
0.025
Ω
0.045
Ω
0.100
Ω
0.060
Ω
0.100
Ω
0.033
Ω
0.070
Ω÷
2
0.045
Ω
0.090
Ω
85°C Maximum Ripple
Current(Irms)
1205mA
555mA
755mA
670mA
450mA
1205mA
825mA
760mA
3500mA
2100mA
1020mA
670mA
450mA
>3500mA
>3800mA
2200mA
1414mA
1826mA
1095mA
1400mA
>2000mA
2350mA
1100mA
Physical
Size(mm)
12.5
×
15
8×11.5
10
×
12.5
10
×
10.2
8×10.2
12
×
16.5
10
×
16
10
×
12.5
10
×
10.5
6.3
×
9.8
12.5
×
15
10
×
10
8×10
10
×
10.5
10.3
×
10.3
10.3
×
10.3
7.3L
×
4.3W
×
4.1H
7.3L
×
5.7W
×
4.0H
7.3L
×
6W
×
4.1H
Quantity
Input
Bus
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Output
Bus
1
N/R
1
2
N/R
1
1
2
1
N/R
1
1
2
1
1
N/R
1
1
2
1
2
1
2
Value(µF)
Vendor Number
EEUFC1V391S
EEUFC1V101
EEUFC1E331
EEVFC1C221P
EEVFC1101P
EEVFC1V471LQ
LXV25VB331M10X16LL
LXZ35VB221M10X12LL
10FS330M
10FS100M
UPL1V331MHH6
UUD1V331MNR1GS
UUD1V2211MNR1GS
10SS330M
10SV300M
16SV100M
TPSV337M010R0100
TPSV337M010R0060
TPSD107M010R100
T510X337M010AS
T495X227M010AS
594D337X0010R2T
594D157X0010C2T
Panasonic, FC (Radial)
35V
35V
25V
16V
25V
35V
25V
35V
10V
10V
35V
35V
35V
10V
10V
16V
10V
10V
10V
10V
10V
10V
10V
390µF
100µF
330µF
220µF
100µF
330µF
330µF
220µF
330µF
100µF
330µF
330µF
220µF
330µF
330µF
100µF
330µF
330µF
150µF
330µF
220µF
330µF
150µF
FC (Surface Mount)
United Chemi-Con
LXV/LXZ
FS
Nichicon, PL (Radial)
UD (Surface Mount)
Oscon, SS (Radial)
SV (Surface Mount)
AVX Tantalum TPS
Kemet, T510
T495
Sprague
594D
For technical support and more information, see inside back cover or visit www.ti.com
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