For technical support and more information, see inside back cover or visit www.ti.com
PT6360 Series
11 A 12-V Input Adjustable
Integrated Switching Regulator
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
Standard Application
C
in
= Required 560 F
C
out
= Optional 330 F
Ordering Information
PT6361
H = 5.0 Volts
PT6362
H = 3.3 Volts
PT6363
H = 2.5 Volts
PT6364
H = 1.8 Volts
PT6365
H = 1.5 Volts
PT6366
H = 1.2 Volts
PT6367
H = 1.0 Volts
Pin
Function
1
Inhibit*
2
V
in
3
V
in
4
V
in
5
GND
6
GND
7
GND
8
GND
9
V
out
10
V
out
11
(+)Sense
12
V
o
Adjust
Features
12 V Input
11 A Output Current
DSP Compatible
>90 % Efficiency
Adjustable Output Voltage
On/Off Inhibit Function
Over-Current Protection
Pin-Out Information
* Denotes negative logic:
Open = Output enabled
Ground = Output disabled
Description
The PT6360 ExcaliburTM series of integrated
switching regulators (ISRs) combines outstand-
ing power density with a comprehensive list of
features. They are an ideal choice for applications
where board space is a premium and performance
cannot be compromised. These modules provide up
to 11 A of output current, yet are housed in a low-
profile, 12-pin, package that is almost half the
size of the previous product generation. The inte-
gral copper case construction requires no heatsink,
and offers the advantages of solderability and a
small footprint (0.64 in for suffix `N'). Both
through-hole and surface mount pin configura-
tions are available.
The PT6360 series operates from a 12-V input
bus and provides a convenient point-of-load power
source for the industry's latest high-performance
DSPs and microprocessors. The series includes
output voltage options as low as 1.0 VDC.
Other features include external output voltage
adjustment, on/off inhibit, short circuit protection,
and an output remote sense.
PT Series Suffix
(PT1234
x
)
Case/Pin
Order
Package
Configuration
Suffix
Code
Vertical
N
(EPH)
Horizontal
A
(EPJ)
SMD
C
(EPK)
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Output Remote Sense
Low-Profile (8 mm)
Small Footprint
(0.64 in, Suffix `N')
Surface Mountable
IPC Lead Free 2
PT6360
V
o
Adjust
V
IN
58
12
910
24
1
L
O
A
D
C
IN
560 F
(Required)
+
C
OUT
330 F
(Optional)
+
Inhibit
GND
GND
V
OUT
11
(+)Sense
For technical support and more information, see inside back cover or visit www.ti.com
PT6360 Series
11 A 12-V Input Adjustable
Integrated Switching Regulator
Performance Specifications
(Unless otherwise stated, T
a
=25 C, V
in
=12 V, C
in
=560 F, C
out
=0 F, and I
o
=I
o
max)
PT6360 SERIES
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Current
I
o
V
in
=12 V
V
o
<
3.3 V
0
--
11
A
V
o
3.3 V
0
--
10
Input Voltage Range
V
in
Over I
o
range
10.8
--
13.2
V
Set-Point Voltage Tolerance
V
o
tol
--
--
2
%V
o
Temperature Variation
Reg
temp
40 C <T
a
< +85 C
--
0.5
--
%V
o
Line Regulation
Reg
line
Over V
in
range
--
3
--
mV
Load Regulation
Reg
load
Over I
o
range
--
5
--
mV
Total Output Variation
Reg
tot
Includes set-point, line, load,
--
--
3
%V
o
40 C
T
a
+85 C
Efficiency
I
o
=8 A
PT6361 ( 5 V)
--
93
--
PT6362 (3.3 V)
--
91
--
PT6363 (2.5 V)
--
90
--
PT6364 (1.8 V)
--
87
--
%
PT6365 (1.5 V)
--
85
--
PT6366 (1.2 V)
--
82
--
PT6367 (1.0 V)
--
80
--
V
o
Ripple (pk-pk)
V
r
20 MHz bandwidth
V
o
=
5.0 V
--
50
--
V
o
=
3.3 V
--
25
--
mV
pp
V
o
2.5 V
--
15
--
Transient Response
1 A/s load step, 50 to 100 % I
o
max,
C
out
=330 F
t
tr
Recovery Time
--
50
--
Sec
V
tr
V
o
over/undershoot
--
70
--
mV
Over-Current Threshold
I
TRIP
Reset, followed by auto-recovery
--
16
--
A
Output Voltage Adjust
V
o
adj
With V
o
Adjust
--
15
(1)
--
%
Switching Frequency
s
Over V
in
and I
o
ranges
300
350
400
kHz
Inhibit Control (pin1)
Referenced to GND (pins 58)
Input High Voltage
V
IH
2
--
Open
(2)
V
Input Low Voltage
V
IL
0.2
--
0.3
Input Low Current
I
IL
Pin 1 to GND
--
10
--
A
Standby Input Current
I
in
standby
Pin 1 to GND
--
5
--
mA
External Input Capacitance
C
in
560
(3)
--
--
F
External Output Capacitance
C
out
0
330
(4)
5,000
F
Operating Temperature Range
T
a
Over V
in
range
40
--
85
(5)
C
Solder Reflow Temperature
T
reflow
Surface temperature of pins or case
--
--
215
(6)
C
Storage Temperature
T
s
--
40
--
125
C
Reliability
MTBF
Per Bellcore TR-332
8.0
--
--
10
6
Hrs
50% stress, T
a
=40C, ground benign
Mechanical Shock
Mil-STD-883D, Method 2002.3
--
500
--
G's
Half Sine, mounted to a fixture
Mechanical Vibration
Mil-STD-883D, Method 2007.2,
--
20
(7)
--
G's
20-2000 Hz, PCB mounted
Weight
--
--
--
10
--
grams
Flammability
--
Materials meet UL 94V-0
Notes: (1) This is a typical value. For the adjustment limits of a specific model consult the related application note on output voltage adjustment.
(2) The Inhibit control (pin 1) has an internal pull-up to Vin, and if left open-circuit the module will operate when input power is applied. A small low-
leakage (<100 nA) MOSFET is recommended to control this input. See application notes for more information.
(3) A 560 F electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimumm of 1.3 Arms of ripple current.
(4) An external output capacitor is not required for basic operation. Adding 330F of distributed capacitance at the load will improve the transient response,
and reduce output ripple voltage.
(5) See SOA curves or consult factory for the appropriate derating.
(6) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215 C. For
further guidance refer to the application note, "Reflow Soldering Requirements for Plug-in Power Surface Mount Products," (SLTA051).
(7) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
For technical support and more information, see inside back cover or visit www.ti.com
Note A:
Characteristic data has been developed from actual products tested at 25C. This data is considered typical data for the ISR.
Efficiency vs Output Current
Power Dissipation vs Output Current
Performance Data; V
in
=12 V
(See Note A)
Output Ripple vs Output Current
PT6360 Series
11 A 12-V Input Adjustable
Integrated Switching Regulator
Pin Descriptions
Vin:
The positive supply voltage input for the module
with respect to the common GND.
Vout:
This is the regulated output voltage from the mod-
ule with respect to the common GND.
GND:
The common node to which the input, output, and
external control signals are referenced.
Inhibit*:
This is an open-collector (open-drain) negative
logic input, that is referenced to GND. Driving this pin to
GND disables the module's output voltage. If Inhibit* is
left open-circuit, the output will be active whenever a
valid input source is applied.
Typical Characteristics
V
o
Adjust:
This pin is used to trim the output voltage to a
value within the range of approximately 15 % of nominal.
The adjustment method uses an external resistor. The
resistor is connected from V
o
Adjust to either the GND
or (+)Sense, in order to adjust the output either up or
down, respectively.
(+)Sense:
An external remote sense input is provided to
allow the regulation circuit to compensate for voltage
drop between the module and the load. For optimal
voltage accuracy (+)Sense should be connected to V
out
. If
desired, (+)Sense may also be left open circuit.
50
60
70
80
90
100
0
2
4
6
8
10
Iout (A)
Efficiency - %
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
0
20
40
60
80
100
0
2
4
6
8
10
Iout (A)
Ripple - mV
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
0
1
2
3
4
5
0
2
4
6
8
10
Iout (A)
Pd - Watts
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
For technical support and more information, see inside back cover or visit www.ti.com
Safe Operating Curves, V
in
=12 V
(See Note B)
20
30
40
50
60
70
80
90
0
2
4
6
8
10
Iout (A)
Ambient Temperature (C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
0
2
4
6
8
10
Iout (A)
Ambient Temperature (
C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
20
30
40
50
60
70
80
90
0
2
4
6
8
10
Iout (A)
Ambient Temperature (
C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
0
2
4
6
8
10
Iout (A)
Ambient Temperature (
C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
0
2
4
6
8
10
Iout (A)
Ambient Temperature (
C)
200LFM
120LFM
60LFM
Nat conv
Airflow
PT6361, V
o
=5 V, 010 A
PT6362, V
o
=3.3 V, 010 A
Safe Operating Curves, V
in
=12 V
(See Note B)
PT6363, V
o
=2.5 V, 011 A
PT6364, V
o
=1.8 V, 011 A
PT6366, V
o
=1.2 V, 011 A
PT6360 Series
11 A 12-V Input Adjustable
Integrated Switching Regulator
Note B:
SOA curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating temperatures.
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6360 Series
Output Remote Sense
The (+)Sense pin allows the regulator to compensate for
limited amounts of `IR' voltage drop in the positive output
connection resistance. This is the voltage drop incurred
in the PCB trace between Vout (pins 9 & 10) of the regu-
lator and the load some distance away. Connecting (+)Sense
to the positive load terminal improves the voltage regu-
lation at the load, particularly when the load current
fluctuates. Although not recommended, leaving (+)Sense
disconnected will not damage the regulator or the load
circuitry. An internal 10
resistor, connected between
the sense pin and the output, keeps the output voltage in
regulation.
With the sense pin connected, the difference between
the voltage measured between V
out
and GND at the
regulator, and that measured from (+)Sense to GND, is
the amount of IR drop being compensated by the regula-
tor. This should be limited to 0.3 V maximum.
Note: The remote sense feature is not designed to compensate
for the forward drop of non-linear or frequency dependent
components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors,
ferrite beads, and fuses. When these components are enclosed
by the remote sense connections they are effectively placed
inside the regulation control loop, which can adversely affect
the stability of the regulator.
Over-Current Protection
To protect against load faults, these ISRs incorporate
output over-current protection. Applying a load that
exceeds the over-current threshold (see data sheet speci-
fications) will cause the regulated output to shut down.
Following shutdown the ISR will periodically attempt to
recover by initiating a soft-start power-up. This is often
described as a "hiccup" mode of operation, whereby the
module continues in a cycle of successive shutdown and
power up until the load fault is removed. During this
period, the average current flowing into the fault is
significantly reduced. Once the fault is removed, the
converter automatically recovers and returns to normal
operation.
Operating Features and System Considerations
for the PT6360 Regulator Series
The PT6360 is a series of integrated switching regulators
(ISRs) that operate off a 12-V input to provide step-
down voltage conversion for output loads of up to 11 A.
Power up & Soft-Start Timing
Following either the application of a valid input source
voltage, or the removal of a ground signal to the Inhihit
control pin (with input power applied), the regulator will
initiate a soft-start power up. A soft start slows the rate at
which the output voltage rises and introduces a short time
delay, t
d
(approx. 10 ms), into the power-up sequence.
Figure 1-1 shows the power-up characteristic of a PT6363
(2.5-V output) with an 8.3-A load. Note that the initial
step of input current when the input voltage begins to
rise is the input capacitor(s) charging.
Figure 1-1
Vin (5V/Div)
Vo (1V/Div)
Iin (2A/Div)
HORIZ SCALE: 5ms/Div
t
d
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