PT6360 Series
11 A 12-V Input Adjustable
Integrated Switching Regulator
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
Features
•
•
•
•
•
•
•
12 V Input
11 A Output Current
DSP Compatible
>90 % Efficiency
Adjustable Output Voltage
On/Off Inhibit Function
Over-Current Protection
• Output Remote Sense
• Low-Profile (8 mm)
• Small Footprint
(0.64 in², Suffix ‘N’)
• Surface Mountable
• IPC Lead Free 2
Description
Ordering Information
The PT6360 Excalibur™ series of integrated
switching regulators (ISRs) combines outstanding 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 lowprofile, 12-pin, package that is almost half the
size of the previous product generation. The integral copper case construction requires no heatsink,
and offers the advantages of solderability and a
small footprint (0.64 in² for suffix ‘N’). Both
through-hole and surface mount pin configurations 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.
PT6361H
PT6362H
PT6363H
PT6364H
PT6365H
PT6366H
PT6367H
Pin-Out Information
Pin Function
= 5.0 Volts
= 3.3 Volts
= 2.5 Volts
= 1.8 Volts
= 1.5 Volts
= 1.2 Volts
= 1.0 Volts
PT Series Suffix (PT1234 x )
Case/Pin
Configuration
Order
Suffix
N
A
C
Vertical
Horizontal
SMD
1
Inhibit*
2
3
Vin
Vin
4
Vin
5
GND
6
7
GND
GND
8
GND
9
Vout
Package
Code
10
11
Vout
(+)Sense
(EPH)
(EPJ)
(EPK)
12
Vo Adjust
(Reference the applicable package code drawing for the dimensions and PC board layout)
* Denotes negative logic:
Open = Output enabled
Ground = Output disabled
Standard Application
Vo Adjust
(+)Sense
11
VIN
2–4
1
+
CIN
560 µF
(Required)
VOUT
9–10
PT6360
5–8
COUT
330 µF
(Optional)
+
12
L
O
A
D
Inhibit
GND
GND
Cin = Required 560 µF
Cout = Optional 330 µF
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
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
(Unless otherwise stated, T a =25 °C, V in =12 V, C in =560 µF, C out =0 µF, and I o =Io max)
Characteristics
Symbols
Conditions
Output Current
Io
Vin =12 V
Input Voltage Range
Set-Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Variation
Vin
Vo tol
∆Regtemp
∆Regline
∆Regload
∆Regtot
Over Io range
Efficiency
η
Vo Ripple (pk-pk)
Vr
Transient Response
Over-Current Threshold
Output Voltage Adjust
Switching Frequency
Inhibit Control (pin1)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
External Input Capacitance
External Output Capacitance
Operating Temperature Range
Solder Reflow Temperature
Storage Temperature
Reliability
ttr
∆Vtr
ITRIP
Vo adj
ƒs
VIH
VIL
IIL
Iin standby
Cin
Cout
Ta
Treflow
Ts
MTBF
Mechanical Shock
Mechanical Vibration
Weight
Flammability
—
—
Min
Vo < 3.3 V
Vo ≥ 3.3 V
–40 °C <Ta < +85 °C
Over Vin range
Over Io range
Includes set-point, line, load,
–40 °C ≤ Ta ≤ +85 °C
PT6361 ( 5 V)
Io =8 A
PT6362 (3.3 V)
PT6363 (2.5 V)
PT6364 (1.8 V)
PT6365 (1.5 V)
PT6366 (1.2 V)
PT6367 (1.0 V)
20 MHz bandwidth
Vo = 5.0 V
Vo = 3.3 V
Vo ≤ 2.5 V
1 A/µs load step, 50 to 100 % I omax,
Cout =330 µF
Recovery Time
Vo over/undershoot
Reset, followed by auto-recovery
With Vo Adjust
Over Vin and Io ranges
Referenced to GND (pins 5–8)
Pin 1 to GND
Pin 1 to GND
Over Vin range
Surface temperature of pins or case
—
Per Bellcore TR-332
50% stress, Ta =40°C, ground benign
Mil-STD-883D, Method 2002.3
Half Sine, mounted to a fixture
Mil-STD-883D, Method 2007.2,
20-2000 Hz, PCB mounted
—
Materials meet UL 94V-0
PT6360 SERIES
Typ
Max
Units
0
0
10.8
—
—
—
—
—
—
—
—
±0.5
±3
±5
11
10
13.2
±2
—
—
—
V
%Vo
%Vo
mV
mV
—
—
±3
%Vo
—
—
—
—
—
—
—
—
—
—
93
91
90
87
85
82
80
50
25
15
—
—
—
—
—
—
—
—
—
—
—
—
—
—
300
50
70
16
±15 (1)
350
—
—
—
—
400
µSec
mV
A
%
kHz
2
–0.2
—
—
560 (3)
0
–40
—
–40
—
—
–10
5
—
330 (4)
—
—
—
Open (2)
0.3
—
—
—
5,000
85 (5)
215 (6)
125
V
µA
mA
µF
µF
°C
°C
°C
8.0
—
—
106 Hrs
—
500
—
G’s
—
20 (7)
—
G’s
—
10
—
grams
A
%
mVpp
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 lowleakage (<100 nA) MOSFET is recommended to control this input. See application notes for more information.
(3) A 560 µF 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 330µF 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.
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
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 module 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.
Vo 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 Vout. If
desired, (+)Sense may also be left open circuit.
Typical Characteristics
Performance Data; Vin =12 V (See Note A)
Efficiency vs Output Current
Power Dissipation vs Output Current
100
5
4
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
80
70
60
Pd - Watts
Efficiency - %
90
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
3
2
1
50
0
0
2
4
6
8
10
0
Iout (A)
2
4
6
Iout (A)
Output Ripple vs Output Current
100
Ripple - mV
80
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
60
40
20
0
0
2
4
6
8
10
Iout (A)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
For technical support and more information, see inside back cover or visit www.ti.com
8
10
PT6360 Series
11 A 12-V Input Adjustable
Integrated Switching Regulator
SLTS179A - JANUARY 2003 - REVISED APRIL 2003
Safe Operating Curves, Vin =12 V (See Note B)
Safe Operating Curves, Vin =12 V (See Note B)
PT6361, Vo =5 V, 0–10 A
PT6363, Vo =2.5 V, 0–11 A
90
90
80
Airflow
70
200LFM
120LFM
60LFM
Nat conv
60
50
40
Ambient Temperature (°C)
Ambient Temperature (°C)
80
30
Airflow
70
200LFM
120LFM
60LFM
Nat conv
60
50
40
30
20
20
0
2
4
6
8
10
0
2
4
Iout (A)
PT6362, Vo =3.3 V, 0–10 A
90
90
80
80
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
Ambient Temperature (°C)
Ambient Temperature (°C)
6
8
10
Iout (A)
PT6364, Vo =1.8 V, 0–11 A
Airflow
70
200LFM
120LFM
60LFM
Nat conv
60
50
40
30
30
20
20
0
2
4
6
8
0
10
2
4
6
8
10
Iout (A)
Iout (A)
PT6366, Vo =1.2 V, 0–11 A
90
Ambient Temperature (°C)
80
Airflow
70
200LFM
120LFM
60LFM
Nat conv
60
50
40
30
20
0
2
4
6
8
10
Iout (A)
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6360 Series
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 stepdown 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, td (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)
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 regulator and the load some distance away. Connecting (+)Sense
to the positive load terminal improves the voltage regulation 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 Ω 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 regulator. 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.
Vo (1V/Div)
td
Iin (2A/Div)
HORIZ SCALE: 5ms/Div
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 specifications) 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.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6360 Series
Capacitor Recommendations for the PT6360 Series
of Integrated Switching Regulators
Input Capacitor:
The recommended input capacitance is determined by
1.3-A minimum ripple current rating and 560 µF minimum capacitance.
Ripple current and <100 mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of
capacitors. Tantalum capacitors have a recommended
minimum voltage rating of 2 × (max. dc voltage + ac
ripple). This is necessary to insure reliability for input
voltage bus applications.
Output Capacitors:
The recommended ESR of the output capacitor is 150mΩ.
Electrolytic capacitors have marginal ripple performance
at frequencies greater than 400kHz but excellent low
frequency transient response. Above the ripple frequency,
ceramic capacitors are necessary to improve the transient
response and reduce any high frequency noise components
apparent during higher current excursions. Preferred low
ESR type capacitor part numbers are identified in Table
2-1.
Tantalum Capacitors
Tantalum type capacitors can be used for the output but
only the AVX TPS, Sprague 593D/594/595 or Kemet
T495/T510 series. These capacitors are recommended
over many other tantalum types due to their higher rated
surge, power dissipation, and ripple current capability.
As a caution the TAJ series by AVX is not recommended.
This series has considerably higher ESR, reduced power
dissipation, and lower ripple current capability. The TAJ
series is less reliable than the AVX TPS series when determining power dissipation capability. Tantalum or Oscon®
types are recommended for applications where ambient
temperatures fall below 0 °C.
Capacitor Table
Table 2-1 identifies the characteristics of capacitors from
a number of vendors with acceptable ESR and ripple
current (rms) ratings. The number of capacitors required
at both the input and output buses is identified for each
capacitor type.
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 100 kHz) are critical parameters necessary to insure both optimum regulator performance
and long capacitor life.
Table 2-1: Input/Output Capacitors
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value (µF)
(ESR) Equivalent
Series Resistance
105 °C Maximum
Ripple
Current (Irms)
Physical Size
(mm)
Input
Bus
Output
Bus
Vendor Part Number
Panasonic
FC (Radial)
35 V
25 V
25 V
680
330
1000
0.043 Ω
0.090 Ω
0.038 Ω
1655 mA
755 mA
1690mA
12.5×20
10×12.5
16×15
1
N/R (1)
1
1
1
1
EEUFC1V681
EEUFC1E331
EEUFC1E102S
FC/FK (Surface Mtg)
50 V
35 V
1000
680
0073 Ω
0.060 Ω
1610 mA
1100 mA
16×16.5
12.5×13.5
1
1 (2)
1
1
EEVFK1H102M
EEVFK1V681Q (Vo<2.6 V)
United Chemi-con
LXZ/LXV Series
MVY (Surface Mtg)
35 V
35 V
25 V
680
680
330
0.037 Ω
0.068 Ω
0.15 Ω
1660 mA
1050 mA
670 mA
12.5×20
10×16
10×10.3
1
1 (2)
N/R (1)
1
1
1
LXZ35VB681M12X20LL
LXV35VB102M16X20LL (Vo<2.6 V)
MVY25VC331M10X10TP
Nichicon
PM Series
35 V
25 V
560
1200
0.048 Ω
0.039 Ω
1360 mA
1400 mA
16×15
16×15
1
1
1
1
UPM1V561MHH6
UPM1E122MHH6
35 V
820
0.038 Ω
1370 mA
18×15
1
1
UPM1V821MHH6
Os-con:
SS
SVP (surface Mount)
Old SV Series
10 V
16 V
330
330
0.025 Ω
0.016 Ω
3500 mA
4700 mA
10×10.5
11×12
N/R (1)
2
1
1
10SS330M (Vo<5.1 V)
16SVP330M
AVX Tantalum
TPS (Surface Mtgt)
10 V
10 V
330
330
0.1 Ω
0.06 Ω
>2500 mA
>3000 mA
7.3L
×5.7W
×4.1H
N/R (1)
N/R (1)
1
1
TPSE337M010R0100 (Vo<5.1 V)
TPSV337M010R0060 (Vo<5.1 V)
Kemet Tantalum
T520/T495 Series
(Surface Mount)
10 V
6.3 V
330
220
0.040 Ω
0.07 Ω
1600 mA
>2000 mA
4.3W
×7.3L
×4.0H
N/R (1)
N/R (1)
1
1
520X337M010AS
T495X227M0100AS
Sprague Tantalum
594D Series
(Surface Mount)
10 V
330
0.045 Ω
2360 mA
7.2L
×6W
×4.1H
N/R (1)
1
594D337X0010R2T
(1) N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
(2) Recommended Input capacitor when Vo<2.6 V; lower RMS mA required .
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6360 Series
Adjusting the Output Voltage of the PT6360 Series
of Integrated Switching Regulators
The output voltage of the PT6360 series of power modules
may be adjusted higher or lower than the pre-set voltage
with the addition of a single external resistor. Table 3-1
gives the allowable adjustment range for each model of the
series as Va (min) and Va (max). The value of the external
resistor can either be calculated using the formulas given
below, or simply selected from the range of values given
in Table 3-2. Refer to Figure 3-1 for the placement of
the required resistor. Use the resistor R1 to adjust up,
and the resistor (R2) to down.
Adjust Up: An increase in the output voltage is obtained
by adding a resistor R2, between V o adjust (pin 12) and
GND (pins 5-8).
Adjust Down: Add a resistor (R1), between Vo adjust (pin 12)
and (+)Sense (pin 11).
Figure 3-1
11
(+)Sense
+VIN
2–4
PT6360
Vin
Inh
1
CIN
560 µF
(Req'd)
GND
5–8
+VO
9–10
Vo
12
(R1)
Adj Down
Ro (Va – 0.8)
Vo – Va
(R1)
=
R2
=
Where:
Vo
Va
Ro
Rs
0.8 Ro
Va – Vo
– Rs
kΩ
– Rs
kΩ
= Original output voltage
= Adjusted output voltage
= The resistance value from Table 3-1
= The series resistance from Table 3-1
Notes:
1. Use a 1% (or better) tolerance resistor in either the (R1)
or R2 location. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors from Vo Adjust to either GND or
Vout. Any capacitance added to the Vo Adjust pin will affect
the stability of the ISR.
3. If the remote sense feature is not being used, the adjust
resistor (R1) can also be connected to Vout, (pins 9–10)
instead of (+)Sense.
Vo(adj)
+
The values of (R1) [adjust down], and R2 [adjust up],
can be calculated using the following formulas. Refer to
Figure 3-1 for the placement of the required resistor;
either (R1) or R2 as appropriate.
COUT
330 µF
(Optional)
R2
Adjust Up
COM
COM
Table 3-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
PT6361
PT6362
PT6363
PT6364
PT6365
PT6366
PT6367
Vo (nom)
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
Va (min)
3.35 V
2.6 V
2.0 V
1.52 V
1.31 V
1.1 V
0.95 V
Va (max)
5.5 V
3.63 V
2.8 V
2.1 V
1.82 V
1.52 V
1.32 V
Ω)
Ro (kΩ
10.0
10.2
10.7
10.2
Ω)
Rs (kΩ
15.0
24.9
24.9
24.9
9.76
24.9
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10.0
10.2
24.9
24.9
Application Notes continued
PT6360 Series
Table 3-2
ISR ADJUSTMENT RESISTOR VALUES
Series Pt. No.
PT6361
PT6362
Vo (nom)
5.0 V
3.3 V
Va (req.d)
PT6363
2.5 V
PT6364
1.8 V
PT6365
1.5 V
PT6366
1.2 V
PT6367
1.0 V
Va (req.d)
5.50
1.0 kΩ
2.800
5.40
5.0 kΩ
2.750
9.3 kΩ
5.30
11.7 kΩ
2.700
17.9 kΩ
5.20
25.0 kΩ
2.650
32.2 kΩ
5.10
65.0 kΩ
2.600
60.7 kΩ
2.550
146.0 kΩ
5.00
3.6 kΩ
4.90
(395.0) kΩ
2.500
4.80
(185.0) kΩ
2.450
(328.0) kΩ
4.70
(115.0) kΩ
2.400
(146.0) kΩ
4.60
(80.0) kΩ
2.350
(85.7) kΩ
4.50
(59.0) kΩ
2.300
(55.3) kΩ
4.40
(45.0) kΩ
2.250
(37.2) kΩ
4.30
(35.0) kΩ
2.200
(25.0) kΩ
4.20
(27.5) kΩ
2.150
(16.4) kΩ
4.10
(21.7) kΩ
2.100
(9.9) kΩ
4.00
(17.0) kΩ
2.050
(4.8) kΩ
7.7 kΩ
3.90
(13.2) kΩ
2.000
(0.8) kΩ
15.9 kΩ
3.80
(10.0) kΩ
1.950
3.70
(7.3) kΩ
1.900
56.7 kΩ
3.60
(5.0) kΩ
2.3 kΩ
1.850
138.0 kΩ
3.55
(4.0) kΩ
7.7 kΩ
1.800
3.50
(3.0) kΩ
15.9 kΩ
1.750
(169.0) kΩ
6.3 kΩ
3.45
(2.1) kΩ
29.5 kΩ
1.700
(66.9) kΩ
14.1 kΩ
3.40
(1.3) kΩ
56.7 kΩ
1.650
(32.9) kΩ
27.2 kΩ
3.35
(0.5) kΩ
138.0 kΩ
1.600
(15.9) kΩ
53.2 kΩ
1.550
(5.7) kΩ
131.0 kΩ
3.30
2.3 kΩ
29.5 kΩ
1.1 kΩ
3.25
(475.0) kΩ
1.500
3.20
(220.0) kΩ
1.475
(239.0) kΩ
1.8 kΩ
3.15
(135.0) kΩ
1.450
(102.0) kΩ
7.1 kΩ
3.10
(92.4) kΩ
1.425
(56.4) kΩ
10.7 kΩ
3.05
(66.9) kΩ
1.400
(33.7) kΩ
15.1 kΩ
3.00
(49.9) kΩ
1.375
(20.0) kΩ
20.8 kΩ
2.95
(37.5) kΩ
1.350
(10.9) kΩ
28.4 kΩ
2.90
(28.6) kΩ
1.325
(4.4) kΩ
39.1 kΩ
2.85
(21.6) kΩ
1.300
55.1 kΩ
2.3 kΩ
2.80
(15.9) kΩ
1.275
81.8 kΩ
4.8 kΩ
2.75
(11.3) kΩ
1.250
135.0 kΩ
7.7 kΩ
2.70
(7.4) kΩ
1.225
295.0 kΩ
11.4 kΩ
2.65
(4.1) kΩ
1.200
2.60
(1.3) kΩ
1.175
(125.0) kΩ
21.7 kΩ
1.150
(45.1) kΩ
29.5 kΩ
1.125
(18.4) kΩ
40.4 kΩ
1.100
(5.1) kΩ
56.7 kΩ
4.2 kΩ
15.9 kΩ
1.075
83.9 kΩ
1.050
138.0 kΩ
1.025
302.0 kΩ
1.000
0.975
(46.5) kΩ
0.950
(5.7) kΩ
R1 = (Blue) R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6360 Series
Using the Inhibit Control of the PT6360 Series of
Integrated Switching Regulators
The PT6360 series of integrated switching regulators
(ISRs) provide step-down voltage conversion for output
loads of up to 11 A. For applications that require the
output voltage to be held off, these ISRs incorporate an
Inhibit* control (pin 1). The Inhibit* control input can be
used for power-up sequencing or whenever there is a
requirement for the output voltage from the ISR to be
turned off.
The ISR functions normally with pin 1 open circuit,
providing a regulated output whenever a valid source
voltage is applied between Vin (pins 2–3) and GND (pins
5–8). When a low-level ground signal is applied to pin 1,
the regulator output is turned off 2 and the input current
is significantly reduced 4.
Turn-On Time: In the circuit of Figure 4-1, turning Q1 1 on
applies a low-voltage to the Inhibit* control (pin 1) and
disables the output of the regulator 2. If Q1 is then turned
off, the ISR executes a soft-start power up 3. Power up
consists of a short delay (approx. 10 msec), followed by a
period in which the output voltage rises to the full regulation voltage. The module produces a regulated output
voltage in approximately 15 msec. Figure 4-2 shows the
rise in both the output voltage and input current for a
PT6363 (2.5 V), following the turn-off of Q1. The turn
off of Q1 corresponds to the rise in the waveform, Q1 Vds.
The waveforms were measured with a 12 VDC input
voltage, and 8.3-A load.
Figure 4-2
Figure 4-1 shows the typical application of the Inhibit*
function. Note the discrete transistor, Q1. The Inhibit*
control has its own internal pull-up to Vin potential. An
open-collector or open-drain device is recommended to
control this input 1. The voltage thresholds are given in
Table 4-1.
Vo (1V/Div)
Iin (2A/Div)
Table 4-1; Inhibit Control Requirements
Parameter
Min
Typ
Max
Enable (VIH)
2.0 V
—
Vin
Disable (VIL)
–0.1 V
—
+0.3 V
—
–0.5 mA
—
I IL
Q1 Vds (10V/Div)
HORIZ SCALE: 5ms/Div
Figure 4-1
Notes:
1. Use an open-collector device with a breakdown voltage
of at least 20 V (preferably a discrete transistor) for the
Inhibit* input. A pull-up resistor is not necessary. To
disable the output voltage the control pin should be
pulled low to less than +0.6 VDC.
+VSENSE
11
2–4
PT6363
1
+
CIN
560 µF
Q1
BSS138
VOUT
9–10
5–8
COUT
330 µF
+
12
VIN
L
O
A
D
Inhibit
GND
GND
2. When a ground signal is applied to the Inhibit* control
(pin 1) the module output is effectively turned off (tristate). The output voltage decays to zero as the load
impedance discharges the output capacitors.
3. When a ground signal to the Inhibit* pin is removed,
the regulator output initiates a soft-start cycle by first
asserting a low impedance to ground. If an external
voltage is applied to the regulator output it will sink
current and possibly overstress the module.
4. When a ground signal is applied to the Inhibit* pin, the
module is effectively turned off and the input current is
reduced to about 0.5 mA.
For technical support and more information, see inside back cover or visit www.ti.com
MECHANICAL DATA
MMSI003A – SEPTEMBER 2001 – REVISED JUNE 2002
EPK (R–MSIP–G12)
METAL SINGLE-IN-LINE MODULE
SUFFIX C
0.017 (0,43) TYP.
0.835 (21,21)
MAX.
0.675 (17,14)
MAX.
Gage Plane
Seating Plane
1.71 (43,43) MAX.
0.006 (0,15)
0°–6°
0.080 (2,03)
1
0.315 (8,00)
0.025 (0,63)
TYP.
0.017 (0,43) TYP.
0.160 (4,06) TYP.
0.100 (2,54) TYP.
0.032 (0,81)
TYP.
0.040 (1,01) TYP.
ø0.065 (1,65) MIN. 4 Places
Plated through connected
to ground plane
0.100
(2,54)
0.050
(1,27)
1.770 (44,95)
0.050
(1,27)
1.670 (42,42)
0.050
(1,27)
0.040
(1,01)
Note I
0.200 (5,08)
0.210
(5,33)
0.505
(12,83) 0.670
(17,10)
Note F
1
0.140
(3,55)
0.090
(2,28)
0.070
(1,77)
Note G
Note H
0.100
(2,54)
0.040 (1,01)
0.165
(4,19)
Note E
0.050 (1,27)
12 Places
0.100 (2,54)
11 Places
0.280 (7,11)
0.080 (2,03)
0.285 (7,24)
PC LAYOUT
4203206/B 06/02
NOTES: A.
B.
C.
D.
E.
F.
All linear dimensions are in inches (mm).
This drawing is subject to change without notice.
2 place decimals are " 0.030 (" 0, 76 mm).
3 place decimals are " 0.010 (" 0, 25 mm).
Recommended mechanical keep-out area.
Power pin connections should utilize two or more
vias per input, ground and output pin.
POST OFFICE BOX 655303
G. Vias are recommended to improve copper adhesion.
H. Solder mask openings to copper island for solder
joints to mechanical pins. Electrically connect
case to ground plane.
I. Case outline reference.
• DALLAS, TEXAS 75265
1
MECHANICAL DATA
MMSI004 – SEPTEMBER 2001
EPJ (R–MSIP–G12)
METAL SINGLE-IN-LINE MODULE
Suffix A
0.835 (21,21)
MAX.
0.675 (17,14)
MAX.
1.71 (43,43) MAX.
1
0.315 (8,00)
Note G
0.025 (0,63) TYP.
0.160 (4,06) TYP.
0.017 (0,43) TYP.
0.100 (2,54) TYP.
0.032 (0,81)
TYP.
0.140 (3,55) MIN.
See Note F
0.040 (1,01) TYP.
0.050 (1,27)
ø0.065 (1,65) MIN. 4 Places
Plated through connected
to ground plane
1.770 (44,95)
1.670 (42,42)
Note H
0.140 (3,55)
0.505 (12,83)
0.090 (2,28)
0.580 (14,73)
1
0.100 (2,54)
ø0.045 (1,14) MIN.
Plated through
12 Places
Note E
4 Places
0.100 (2,54)
11 Places
0.040 (1,01)
0.280 (7,11)
0.080 (2,03)
0.285 (7,24)
PC LAYOUT
4203205/A 08/01
NOTES: A.
B.
C.
D.
E.
F.
All linear dimensions are in inches (mm).
This drawing is subject to change without notice.
2 place decimals are " 0.030 (" 0, 76 mm).
3 place decimals are " 0.010 (" 0, 25 mm).
Recommended mechanical keep-out area.
Electrical pin length mounted on circuit board
seating plane to pin end.
G. Electrically connect case to ground plane.
H. Case outline reference.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
MECHANICAL DATA
MMSI069 – SEPTEMBER 2001
EPH (R–MSIP–T12)
METAL SINGLE-IN-LINE MODULE
Suffix N
0.48 (12,19) MAX.
0.315 (8,00)
1.71 (43,43) MAX.
0.032 (0,81) TYP.
1
0.040 (1,01) TYP.
0.675 (17,14)
MAX.
Note G
0.025 (0,63) TYP.
0.017 (0,43) TYP.
0.160 (4,06) TYP.
0.100 (2,54) TYP.
0.140 (3,55) MIN.
See Note F
1.75 (44,45)
1.670 (42,42)
0.040 (1,01)
Note E
ø0.065 (1,65) MIN. 4 Places
Plated through. See Note G.
0.51
(12,95)
0.35
(8,89)
1
ø0.045 (1,14) MIN.
Plated through
12 Places
0.040 (1,01)
0.285 (7,24)
0.100 (2,54)
11 Places
0.200 (5,08)
0.080 (2,03)
0.080 (2,03)
2 Places
4203204/A 09/01
NOTES: A.
B.
C.
D.
All linear dimensions are in inches (mm).
This drawing is subject to change without notice.
2 place decimals are 0.030 (0,76mm).
3 place decimals are 0.010 (0,25mm).
POST OFFICE BOX 655303
E. Recommended mechanical keep out area.
F. Electrical pin length mounted on circuit board seating
plane to pin end.
G. Electrically connect case to ground plane.
• DALLAS, TEXAS 75265
1
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