For technical support and more information, see inside back cover or visit www.ti.com
PT6460 Series
14-A 5-V Input Adjustable
Integrated Switching Regulator SLTS178B - JANUARY 2003 - REVISED JUNE 2003
Standard Application
Cin = Required 470 µF
Cout = Optional 330 µF
Ordering Information
PT6461H= 3.3 Volts
PT6462H= 2.5 Volts
PT6463H= 2.0 Volts
PT6464H= 1.8 Volts
PT6465H= 1.5 Volts
PT6466H= 1.2 Volts
PT6467H= 1.0 Volts
Pin Function
1 Inhibit*
2V
in
3V
in
4V
in
5 GND
6 GND
7 GND
8 GND
9V
out
10 Vout
11 (+)Sense
12 Vo Adjust
Features
•5 V Input
•14 A Output Current
•Low-Profile (8mm)
•DSP Compatible
•>90 % Efficiency
•Adjustable Output Voltage
•On/Off Inhibit
•Pre-Bias Start-up Capability
Pin-Out Information
* Denotes negative logic:
Open = Output enabled
Ground = Output disabled
Description
The PT6460 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 a full 14 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 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 PT6460 series operates from a 5-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, pre-bias startup, short
circuit protection, and an output remote sense.
PT Series Suffix (PT1234x)
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)
•Over-Current Protection
•Output Remote Sense
•Optional Output Capacitor
•Small Footprint
(0.64 in², Suffix ‘N’)
•Surface Mount Compatible
•IPC Lead Free 2
PT6460
V
o
Adjust
V
IN
5–8
12
9–10
2–4
1
L
O
A
D
C
IN
470 µF
(Required)
+
C
OUT
330 µF
(Optional)
+
Inhibit
GND GND
V
OUT
11
+V
SENSE
For technical support and more information, see inside back cover or visit www.ti.com
PT6460 Series
14-A 5-V Input Adjustable
Integrated Switching Regulator
Specifications (Unless otherwise stated, Ta =25 °C, Vin =5 V, Cin =470 µF, Cout =0 µF, and Io =Iomax)
PT6460 SERIES
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoVin =5 V 0 — 14 A
Input Voltage Range Vin Over Io range 4.5 — 5.5 V
Set-Point Voltage Tolerance Vo tol — — ±2 %Vo
Temperature Variation ∆Regtemp –40 °C <Ta < +85 °C — ±0.5 — %Vo
Line Regulation ∆Regline Over Vin range — ±10 — mV
Load Regulation ∆Regload Over Io range — ±12 — mV
Total Output Variation ∆Regtot Includes set-point, line, load, ——±3%V
o
–40 °C ≤ Ta ≤ +85 °C
Efficiency ηIo =10 A PT6461 (3.3 V) — 94 —
PT6462 (2.5 V) — 93 —
PT6463 (2.0 V) — 91 —
PT6464 (1.8 V) — 90 — %
PT6465 (1.5 V) — 88 —
PT6466 (1.2 V) — 86 —
PT6467 (1.0 V) — 84 —
Vo Ripple (pk-pk) Vr20MHz bandwidth — 25 — mVpp
Transient Response 1 A/µs load step, 50 to 100 % Iomax,
Cout =330 µF
ttr Recovery Time — 50 — µSec
∆Vtr Vo over/undershoot — 100 — mV
Over-Current Threshold ITRIP Reset, followed by auto-recovery — 27.5 — A
Output Voltage Adjust Vo adj — ±15 (1) —%
Switching Frequency ƒsOver Vin and Io ranges — 300 — kHz
Inhibit Control (pin1) Referenced to GND (pins 5–8)
Input High Voltage VIH Vin –0.5 — Open (2) V
Input Low Voltage VIL –0.2 — 0.8
Input Low Current IIL Pin 1 to GND — –10 — µA
Inhibit Input Current Iin inhibit Pin 1 to GND — 5 — mA
External Input Capacitance Cin 470 (3) ——µF
External Output Capacitance Cout 0 330 (4) (5) 3,300 µF
Operating Temperature Range TaOver Vin range –40 (5) —85
(6) °C
Solder Reflow Temperature Treflow Surface temperature of module pins or case — — 215 (7) °C
Storage Temperature Ts— –40 — 125 °C
Reliability MTBF Per Bellcore TR-332 8.0 — — 106 Hrs
50 % stress, Ta =40 °C, ground benign
Mechanical Shock Mil-STD-883D, Method 2002.3 — 500 — G
Half Sine, mounted to a fixture
Mechanical Vibration Mil-STD-883D, Method 2007.2, Suffix N — 20 (8) —G
20-2000 Hz, PCB mounted Suffixes A, C — 20 (8) —
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, 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 470 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimumm of 0.7 Arms of ripple current.
(4) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response.
(5) For operation below 0 °C, COUT should have stable characteristics. Use either low-ESR tantalum or Oscon® type capacitors.
(6) See SOA curves or consult factory for the appropriate derating.
(7) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperature 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).
(8) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
SLTS178B - JANUARY 2003 - REVISED JUNE 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 25°C. This data is considered typical data for the ISR.
Efficiency vs Output Current Power Dissipation vs Output Current
Performance Data; Vin =5.0 V (See Note A)
Output Ripple vs Output Current
PT6460 Series
14-A 5-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. Pulling this pin
low 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
Vo Adjust: This pin is used to trim the output voltage
over a typical range of ±15 % of nominal. The adjust-
ment method uses an external resistor. The resistor is
connected from Vo Adjust to either the GND or (+)Sense,
in order to adjust the output either up or down, respec-
tively. Consult the related application note for the adjust
limits on a specific part.
Vsense: 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 Vsense should be connected to VOUT. If
desired, Vsense may also be left open circuit.
50
60
70
80
90
100
02468101214
Iout
(
A
)
Efficiency - %
PT6461
PT6462
PT6463
PT6464
PT6465
PT6466
PT6467
0
10
20
30
40
50
02468101214
Iout
(
A
)
Ripple - mV
PT6462
PT6463
PT6464
PT6461
PT6465
PT6466
PT6467
0
1
2
3
4
5
02468101214
Iout
(
A
)
Pd - Watts
SLTS178B - JANUARY 2003 - REVISED JUNE 2003
For technical support and more information, see inside back cover or visit www.ti.com
PT6460 Series
Safe Operating Curve, Vin =5 V (See Note B)
Typical Characteristics
20
30
40
50
60
70
80
90
02468101214
Iout
(
A
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
02468101214
Iout
(
A
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
PT6461; VOUT =3.3 V
PT6467; VOUT =1 V
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
14-A 5-V Input Adjustable
Integrated Switching Regulator SLTS178B - JANUARY 2003 - REVISED JUNE 2003
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6460 & PT6470 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 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 Vout 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.
Pre-Bias Startup
In complex digital systems an external voltage can some-
times be present at the output of the regulator during
power up. For example, this voltage may be backfed
through a dual-supply logic component such as an FPGA
or ASIC. Another path might be via a clamp diode (to a
lower supply voltage) as part of a power-up sequencing
implementation.
Although the PT6460 (5-V input) and PT6470 (3.3-V
input) series of regulators will sink current under steady-
state conditions, they will not do so during startup. This
feature allows these regulators to start up while an external
voltage is simultaneously applied to the output. To facilitate
this feature the input voltage must always be greater than
or equal to the output voltage throughout the power-up
and power-down sequence. Startup includes both the
application of a valid input source voltage, or the removal
of a ground signal from the Inhibit* control (pin 1) with
a valid input source applied. The output of the regulator
is also effectively off (tri-state), during the period that
the Inhibit* control is held low.
Note: If the pre-bias is greater than the nominal regulation
voltage, the module will begin sinking current at the end of its
soft-start power-up sequence. This could overstress the regulator if
the current exceeds its rated output.
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 PT6460 & PT6470 Regulator Series
The PT6460 (5-V input) and the PT6470 (3.3-V input)
series of integrated switching regulators (ISRs) provide
step-down voltage conversion for output loads of up to
14 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 (approximately 2 ms), into the power-up sequence.
Figure 1-1 shows the power-up characteristic of a PT6464
(5-V input, 1.8-V output) with a 8.5-A load.
Vo (1V/Div)
Iin (2A/Div)
Vin (2V/Div)
HORIZ SCALE: 5ms/Div
t
d
Figure 1-1
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Application Notes
Table 2-1: Input/Output Capacitors
Capacitor Recommendations for the
PT6460 & PT6470 Regulator Series
Input Capacitor:
The recommended input capacitor is determined by a
minimum of 470 µF capacitance and 700 mA minimum
ripple current rating.
Ripple current and <100 mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when when designing with different types
of capacitors. Tantalum capacitors have a recommended
minimum voltage rating of 2× (maximum DC voltage +
AC ripple). This is necessary to insure reliability for
input voltage bus applications.
Output Capacitors (Optional):
The ESR of the capacitors should be less than 150 mΩ.
Electrolytic capacitors have marginal ripple performance at
frequencies greater than 400 kHz but excellent low fre-
quency 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.
PT6460 & PT6470 Series
Tantalum Capacitors( Optional Output 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 deter-
mining 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
(at 100kHz) are critical parameters necessary to insure both
optimum regulator performance and long capacitor life.
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elppiRmumixaM
C°501@tnerruC
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)mm(
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cinosanaP
)laidaR(CF
)TMS(KF
V61
V01
V52
V53
074
065
074
074
90.0 Ω
90.0 Ω
80.0 Ω
60.0 Ω
Am557
Am557
Am058
Am0011
5.21x01
01 ×5.21
2.01x01
5.21 ×5.31
1
1
1
1
1
1
1
1
174C1CFUEE
165A1CFUEE
P174E1KFVEE
Q174V1KFVEE
noc-imehCdetinU
VXL/ZXL
XF
V61
V01
V01
074
086
086
090.0 Ω
090.0 Ω
510.0 Ω
Am067
Am077
Am5374
5.21x01
5.21x01
01 ×5.01
1
1
1
1
1
1
LL21X01M174BV61ZXL
LL21X01M186BV01ZXL
M086XF01
MP/LPnocihciN
)TMS(seireSXN
V61
V61
V01
033
074
033
21.0 ÷60.0=2 Ω
90.0 Ω
420.0 Ω
Am547
Am077
Am0773
5.21x01
51x01
8x01
2
1
2
1
1
1
6HPM133C1MPU
6HPM174C1MPU
SG1RACM033A1XNP
PSnoc-sO-oynaS
)TMS(PVS
V01
V01
074
065
510.0 Ω
310.0 ΩAm0054>
Am0025>
01 ×5.01
11 ×7.21
1
1
1
1
M074PS01
M065PVS01
mulatnaTXVA
)TMS(SPT
V01
V01
074
074
540.0 Ω
060.0 ΩAm3271
Am6281
L3.7 ×W7.5
×H1.4
1
1
1
1
5400R010M774ESPT
0600R010M774VSPT
remyloPtemeK
mulatnaT
(035T/025T)TMS
V01
V01
033
033
040.0 Ω
510.0 ΩAm0081
Am0083>
W3.4 ×L3.7
×H0.4
2
2
1
1
SA010M733X025T
SA010M733X035T
mulatnaTeugarpS
(D495)TMS
V01086090.0 ΩAm0661L2.7 ×W6
×H1.4
11 T2R0100X786D595
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6460 & PT6470 Series
Adjusting the Output Voltage of the PT6460 &
PT6470 ISR Series
The output voltage of the PT6460 (5-V input) and the
PT6470 (3.3-V input) series of power modules may be
adjusted higher or lower than the pre-set voltage. The
adjustment method requires a single external resistor.
The value of the resistor can either be calculated using
the formulas given below, or simply selected from the
range of values given in Table 3-2. Table 3-1 gives the
allowable adjustment range for each model as Va (min)
and Va (max). Refer to Figure 3-1 for the placement of
the required resistor. Resistor R1 adjusts the output voltage
up, and the resistor (R2) adjusts it down.
Adjust Up: An increase in the output voltage is obtained
by adding a resistor R2, between Vo Adjust (pin 12) and
GND (pin 5).
Adjust Down: Add a resistor (R1), between Vo Adjust (pin 12)
and +Vsense (pin 11).
Figure 3-1
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.
(R1)= Ro (Va – 0.8) – RskΩ
Vo – Va
R2= 0.8 Ro– RskΩ
Va – Vo
Where: Vo= Original output voltage
Va= Adjusted output voltage
Ro= The resistance value from Table 3-1
Rs= The series resistance from Table 3-1
R
2
Adjust Up
C
IN
560 µF
(Req'd)
+V
O
COMCOM
+V
IN
+
(R
1
)
Adj Down
PT6460/70
2–4
5–812
9–10
Vin Vout
Vo(adj)GND
1
Inhibit*
C
OUT
330 µF
(Optional)
+Vsense
+
11
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 adj 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 +Vsense.
4. The PT6472 may not be adjusted higher than the
nominal output voltage of 2.5 V. There is insufficient
input voltage to allow for any increase in output voltage.
Table 3-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. Nos.
5-V Bus: PT6461 PT6462 PT6463 PT6464 PT6465 PT6466 PT6467
3.3-V Bus: N/A PT6472 PT6473 PT6474 PT6475 PT6476 PT6477
Vo (nom) 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V 1 V
Va (min) 2.6 V 2.0 V 1.66 V 1.52 V 1.31 V 1.1 V 0.95 V
Va (max) 3.63 V 2.8 V * 2.32 V 2.1 V 1.82 V 1.52 V 1.32 V
Ro (kΩΩ
ΩΩ
Ω)10.2 10.7 10.0 10.2 9.76 10.0 10.2
Rs (kΩΩ
ΩΩ
Ω)24.9 24.9 24.9 24.9 24.9 24.9 24.9
* The PT6472 may not be adjusted higher than its nominal output voltage of 2.5 V. See note 4
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
continued
PT6460, PT6470 Series
Va (req.d)
2.300 1.8 kΩ
2.250 7.1 kΩ
2.200 15.1 kΩ
2.150 28.4 kΩ
2.100 55.1 kΩ2.3 kΩ
2.050 135.0 kΩ7.7 kΩ
2.000 15.9 kΩ
1.950 (205.0) kΩ29.5 kΩ
1.900 (85.1) kΩ56.7 kΩ
1.850 (45.1) kΩ138.0 kΩ
1.800 (25.1) kΩ1.1 kΩ
1.750 (13.1) kΩ(169.0) kΩ6.3 kΩ
1.700 (5.1) kΩ(66.9) kΩ14.1 kΩ
1.650 (32.9) kΩ27.2 kΩ
1.600 (15.9) kΩ53.2 kΩ
1.550 (5.7) kΩ131.0 kΩ
1.500 1.8 kΩ
1.475 (239.0) kΩ4.2 kΩ
1.450 (102.0) kΩ7.1 kΩ
1.425 (56.4) kΩ10.7 kΩ
1.400 (33.7) kΩ15.1 kΩ
1.375 (20.0) kΩ20.8 kΩ
1.350 (10.9) kΩ28.4 kΩ
1.325 (4.4) kΩ39.1 kΩ
1.300 55.1 kΩ2.3 kΩ
1.275 81.8 kΩ4.8 kΩ
1.250 135.0 kΩ7.7 kΩ
1.225 295.0 kΩ11.4 kΩ
1.200 15.9 kΩ
1.175 (125.0) kΩ21.7 kΩ
1.150 (45.1) kΩ29.5 kΩ
1.125 (18.4) kΩ40.4 kΩ
1.100 (5.1) kΩ56.7 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
Table 3-2
ISR ADJUSTMENT RESISTOR VALUES
Series Pt. Nos.
5.0V Bus: PT6461 PT6462 PT6463 PT6464 PT6465 PT6466 PT6467
3.3V Bus: N/A PT6472 PT6473 PT6474 PT6475 PT6476 PT6477
Vo (nom) 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V 1.0V
Va (req.d)
3.60 2.3 kΩ
3.55 7.7 kΩ
3.50 15.9 kΩ
3.45 29.5 kΩ
3.40 56.7 kΩ
3.35 138.0 kΩ
3.30
3.25 (475.0) kΩ
3.20 (220.0) kΩ
3.15 (135.0) kΩ
3.10 (92.4) kΩ
3.05 (66.9) kΩ
3.00 (49.9) kΩ
2.95 (37.5) kΩ
2.90 (28.6) kΩ
2.85 (21.6) kΩ
2.80 (15.9) kΩ3.6 kΩ
2.75 (11.3) kΩ9.3 kΩ
2.70 (7.4) kΩ17.9 kΩ
2.65 (4.1) kΩ32.2 kΩ
2.60 (1.3) kΩ60.7 kΩ
2.550 146.0 kΩ
2.500
2.450 See note 4 (328.0) kΩ
2.400 (146.0) kΩ
2.350 (85.7) kΩ
2.300 (55.3) kΩ
2.250 (37.2) kΩ
2.200 (25.0) kΩ
2.150 (16.4) kΩ
2.100 (9.9) kΩ
2.050 (4.8) kΩ
2.000 (0.8) kΩ
R1 = Black R2 = (Blue)
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Using the Inhibit Control of the PT6460 & PT6470
Series of Step-Down ISRs
The PT6460 (5-V input) and the PT6470 (3.3-V input)
series of integrated switching regulators (ISRs) provide
step-down voltage conversion for output loads of up to
14 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 3.
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.
Table 4-1; Inhibit Control Requirements
Parameter Min Typ Max
Enable (VIH)V
in – 0.5 V — Open
Disable (VIL) –0.2 V — +0.8 V
I IL — –0.2 mA —
Notes:
1. Use an open-collector device with a breakdown voltage
of at least 10 V (preferably a discrete transistor) for the
Inhibit* control input. A pull-up resistor is not necessary.
To disable the output voltage the control pin should be
pulled low to less than +0.8 VDC.
2. When a ground signal is applied to the Inhibit* control
(pin 1) the module output is effectively turned off (tri-
state). The output voltage decays to zero as the load
impedance discharges the output capacitors.
3. When the output is disabled via the Inhibit* pin, the
input current is reduced to approximately 5 to 10 mA.
Figure 4-1
Turn-On Time: In the circuit of Figure 4-1, turning Q1 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. Power up
consists of a short delay (approx. 2 msec), followed by a
period in which the output voltage rises to the full regu-
lation voltage. The module produces a regulated output
voltage within 10 msec. Figure 4-2 shows the typical rise
in both the output voltage and input current for a PT6464
(1.8 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 5VDC input voltage,
and 8.5-A load.
Figure 4-2
Vo (1V/Div)
Iin (2A/Div)
Q1Vds (5V/Div)
HORIZ SCALE: 2ms/Div
PT6460 & PT6470 Series
C
IN
560 µF
(Req'd)
COM
+V
IN
+
PT6464
2–4
5–812
9–10
Vin Vout
Vo(adj)GND
1
Inhibit*
C
OUT
330 µF
(Optional)
+Vsense
+
11
1 =Inhibit
Q
1
BSS138
L
O
A
D
GND
V
OUT
+V
SENSE
PACKAGE OPTION ADDENDUM
www.ti.com 1-Aug-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
PT6461A NRND SIP MODULE EPJ 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6461C NRND SIP MODULE EPK 12 21 Pb-Free (RoHS) Call TI Level-3-215C-168HRS
PT6461N OBSOLETE SIP MODULE EPH 12 TBD Call TI Call TI
PT6462A NRND SIP MODULE EPJ 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6462C NRND SIP MODULE EPK 12 21 Pb-Free (RoHS) Call TI Level-3-215C-168HRS
PT6462N NRND SIP MODULE EPH 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6463A OBSOLETE SIP MODULE EPJ 12 TBD Call TI Call TI
PT6463C NRND SIP MODULE EPK 12 21 Pb-Free (RoHS) Call TI Level-3-215C-168HRS
PT6464A NRND SIP MODULE EPJ 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6464C OBSOLETE SIP MODULE EPK 12 TBD Call TI Call TI
PT6464N OBSOLETE SIP MODULE EPH 12 TBD Call TI Call TI
PT6465A NRND SIP MODULE EPJ 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6465C NRND SIP MODULE EPK 12 21 Pb-Free (RoHS) Call TI Level-3-215C-168HRS
PT6465N NRND SIP MODULE EPH 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6466A NRND SIP MODULE EPJ 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6466C NRND SIP MODULE EPK 12 21 Pb-Free (RoHS) Call TI Level-3-215C-168HRS
PT6466N NRND SIP MODULE EPH 12 21 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT6467C OBSOLETE SIP MODULE EPK 12 TBD Call TI Call TI
PT6467N OBSOLETE SIP MODULE EPH 12 TBD Call TI Call TI
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
PACKAGE OPTION ADDENDUM
www.ti.com 1-Aug-2011
Addendum-Page 2
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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