PT6444C [TI]
6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator;
| 型号： | PT6444C |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator 开关 |
| 文件： | 总8页 (文件大小：180K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT6440 Series
6-A 5-V/3.3-V Input Adjustable
Integrated Switching Regulator
SLTS133B
Revised (1/30/2002)
Features
• 6A Output Current
• Input Voltage Range:
3.1 V to 5.5 V
• 90% Efficiency
• Adjustable Output Voltage
• Standby Function
• Short Circuit Protection
• Small Footprint (0.61 in2)
• Solderable Copper Case
6
• 8.8 10 Hours MTBF
Description
Ordering Information
Pin-Out Information
PT 6441r = 3.3 Volts
† PT 6442r = 2.5 Volts
† PT 6443r = 2.0 Volts
† PT 6444r = 1.8 Volts
† PT 6445r = 1.5 Volts
† PT 6446r = 1.2 Volts
† PT 6447r = 1.0 Volts
The PT6440 Excalibur™ power modules
are a series of high performance Integrated
Switching Regulators (ISRs), housed in a
thermally efficient solderable copper case.
These modules operate from input voltages
as low as 3.1V to produce a high-output low-
voltage power source; ideal for powering the
industry’s latest DSP and microprocessors.
The series includes standard output bus
voltages as low as 1.0VDC.
The innovative copper case construction
provides superior thermal performance in a
small footprint. Both through-hole and
surface mount pin configurations are avail-
able. The PT6440 series operating features
include external output voltage adjustment,
an On/Off inhibit, and short-circuit protection.
A 100µF input, and 330µF output capacitor
are required for proper operation.
Pin Function
1
2
3
4
5
6
7
8
9
Inhibit *
Vin
Vin
Vin
GND
GND
GND
GND
Vout
† 3.3V Input Bus Capable
PT Series Suffix
(PT1234x)
10 Vout
11 Vout
12 Vout Adj *
Case/Pin
Configuration
O rder
Suffix
Package
Code *
Vertical
Horizontal
SMD
N
A
C
(EPH)
(EPJ)
(EPK)
*
For further information, see
application notes.
* Previously known as package styles 1540/50.
(Reference the applicable package code drawing
for the dimensions and PC board layout)
Standard Application
VO(ADJ)
12
+VIN
+VOUT
2,3,4
9,10,11
PT6440
+
+
1
5,6,7,8
CIN
COUT
INH
GND
GND
Cin = Required 100µF electrolytic
Cout = Required 330µF electrolytic
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 (Unless otherwise stated, Ta =25°C, Vin =5V, Cin =100µF, Cout =330µF, and Io =Iomax)
PT6440 SERIES
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
(1)
(1)
Output Current
Io
Ta =+60°C, 200LFM
0.1
0.1
—
—
6
6
A
Ta =+25°C, natural convection
Input Voltage Range
Vin
Over Io Range
Vo =3.3V
Vo ≤2.5V
4.5
3.1
—
—
5.5
5.5
VDC
(2)
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Vo tol
—
—
—
—
1
0.5
6
2
—
%Vo
%Vo
mV
Regtemp
Regline
Regload
∆Votot
–40° ≤Ta ≤ +85°C, Io =Iomin
Over Vin range
Over Io range
Includes set-point, line, load,
–40° ≤Ta ≤ +85°C
10
25
10
mV
—
2
3
%Vo
Efficiency
η
Io =4A
Vo =3.3V
Vo =2.5V
Vo =2.0V
Vo =1.8V
Vo =1.5V
Vo =1.2V
Vo =1.0V
—
—
—
—
—
—
—
91
89
85
85
81
80
78
—
—
—
—
—
—
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
—
20
—
mVpp
Transient Response
ttr
∆Vtr
Isc threshold
ƒs
5A/µs load step, 50% to 100% Iomax—
Vo over/undershoot
50
—
µs
—
—
300
70
10
350
—
—
mV
A
Short Circuit Threshold
Switching Frequency
Over Vin and Io range
400
kHz
Inhibit (Pin 1)
Referenced to –Vin (pin 8)
(2)
Input High Voltage
Input Low Voltage
Input Low Current
VIH
VIL
IIL
Vin–0.5
–0.2
—
—
330
100
—
—
–0.5
+0.5
—
—
—
Open
+0.5
–
—
1,000
—
V
mA
mA
µF
µF
°C
°C
Standby Input Current
External Output Capacitance
External Input Capacitance
Operating Temperature Range
Storage Temperature
Iin standby
Cout
Cin
pins 1 & 5 connected
See application schematic
See application schematic
Over Vin range
(3)
(4)
T
–40
+85
+125
a
T
s
—
–40
—
Reliability
MTBF
Per Bellcore TR-332
6
8.8
—
—
—
10 Hrs
50% stress, Ta =40°C, ground benign
Mechanical Shock
—
Per Mil-Std-883D, method 2002.3,
1ms, half-sine, mounted to a fixture
—
500
G’s
Mechanical Vibration
—
Mil-Std-883D, Method 2007.2,
20-2000Hz, soldered in PCB
(5)
—
—
20
23
—
—
G’s
Weight
Flammability
—
—
grams
Materials meet UL 94V-0
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 poweris applied. The open-circuit
voltage is the input voltage Vin. 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, Cin, must be rated for a minimum of 350mArms of ripple current, and the ESR of the output
capacitor, Cout, must less than 100mΩ @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
Typical Characteristics
PT6440 Series
6-A 5-V/3.3-V Input Adjustable
Integrated Switching Regulator
PT6440 Series Performance; @VIN =5.0V (See Note A)
PT6440 Series Performance; @VIN =3.3V (See Note A)
Efficiency Vs Output Current
Efficiency Vs Output Current
100
100
90
90
PT6441
PT6442
PT6442
80
80
70
60
50
PT6443
PT6444
PT6445
PT6446
PT6447
PT6443
PT6444
PT6445
70
PT6446
PT6447
60
50
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Iout (A)
Iout (A)
Ripple Vs Output Current
Ripple Vs Output Current
60
50
40
30
20
10
0
60
50
40
30
20
10
0
PT6446
PT6443
PT6444
PT6442
PT6445
PT6441
PT6447
PT6446
PT6447
PT6445
PT6444
PT6443
PT6442
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Iout (A)
Iout (A)
Power Dissipation Vs Output Current
Power Disspiation Vs Output Current
2.5
2
2.5
2
PT6441/2
PT6443/4
PT6445/6
PT6447
1.5
1
1.5
1
PT6442/3/4
PT6445/6
PT6447
0.5
0
0.5
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Iout (A)
Iout (A)
Safe Operating Area Curves (See Note B)
Safe Operating Area Curves (See Note B)
PT6440 Series, VIN =5.0V
PT6440 Series, VIN =3.3V
90.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
80.0
70.0
Airflow
Airflow
200LFM
120LFM
60LFM
200LFM
120LFM
60LFM
60.0
50.0
40.0
30.0
20.0
Nat conv
Nat conv
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
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
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.
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.
Output Capacitors
Capacitor Table
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.
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 Characteristics
Quantity
Capacitor Vendor/
Component
Series
Working
Voltage
(ESR) Equivalent
Series Resistance
85°C Maximum Ripple
Physical
Size(mm)
Input
Bus
Output
Bus
Value(µF)
Vendor Number
Current(Irms)
Panasonic, FC (Radial)
FC (Surface Mount)
35V
35V
25V
390µF
100µF
330µF
0.065Ω
0.117Ω
0.090Ω
1205mA
555mA
755mA
12.5×15
8×11.5
10×12.5
1
1
1
1
N/R
1
EEUFC1V391S
EEUFC1V101
EEUFC1E331
16V
25V
35V
220µF
100µF
330µF
0.15Ω÷2
0.40Ω
0.065Ω
670mA
450mA
1205mA
10×10.2
8×10.2
12×16.5
1
1
1
2
N/R
1
EEVFC1C221P
EEVFC1101P
EEVFC1V471LQ
United Chemi-Con
LXV/LXZ
25V
35V
330µF
220µF
0.084Ω
0.090Ω÷2
825mA
760mA
10×16
10×12.5
1
1
1
2
LXV25VB331M10X16LL
LXZ35VB221M10X12LL
FS
10V
10V
330µF
100µF
0.025Ω
0.040Ω
3500mA
2100mA
10×10.5
6.3×9.8
1
1
1
N/R
10FS330M
10FS100M
Nichicon, PL (Radial)
UD (Surface Mount)
35V
330µF
0.065Ω
1020mA
12.5×15
1
1
UPL1V331MHH6
35V
35V
330µF
220µF
0.090Ω
0.17Ω÷2
670mA
450mA
10×10
8×10
1
1
1
2
UUD1V331MNR1GS
UUD1V2211MNR1GS
Oscon, SS (Radial)
SV (Surface Mount)
10V
330µF
0.025Ω
>3500mA
10×10.5
1
1
10SS330M
10V
16V
330µF
100µF
0.025Ω
0.045Ω
>3800mA
2200mA
10.3×10.3
10.3×10.3
1
1
1
N/R
10SV300M
16SV100M
AVX Tantalum TPS
10V
10V
10V
330µF
330µF
150µF
0.100Ω
0.060Ω
0.100Ω
1414mA
1826mA
1095mA
7.3L
×4.3W
×4.1H
1
1
1
1
1
2
TPSV337M010R0100
TPSV337M010R0060
TPSD107M010R100
Kemet, T510
T495
10V
10V
330µF
220µF
0.033Ω
0.070Ω÷2
1400mA
>2000mA
7.3L ×5.7W
×4.0H
1
1
1
2
T510X337M010AS
T495X227M010AS
Sprague
594D
10V
10V
330µF
150µF
0.045Ω
0.090Ω
2350mA
1100mA
7.3L ×6W
×4.1H
1
1
1
2
594D337X0010R2T
594D157X0010C2T
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6440 Series
Adjusting the Output Voltage of the PT6440
Excalibur 5V/3.3V Bus Step-Down ISRs
The output voltage of the PT6440 Series ISRs may be
adjusted higher or lower than the factory trimmed pre-
set voltage with the addition of a single external resistor.
Table 1 gives the allowable adjustment range for each
model for either series as Va (min) and Va (max).
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas. Refer to
Figure 1 and Table 2 for both the placement and value of the
required resistor; either (R1) or R2 as appropriate.
Ro (Va – 0.9)
(R1)
=
=
– Rs
– Rs
kΩ
kΩ
Vo – Va
Adjust Up: An increase in the output voltage is obtained by
adding a resistor R2, between Vo Adj (pin 12) and GND
(pins 5–8).
0.9 Ro
Va – Vo
R2
Adjust Down: Add a resistor (R1), between Vo Adj (pin 12)
and Vout (pins 9–11).
Where:
V
V
a
= Original output voltage
= Adjusted output voltage
o
Ro = The resistance value from Table 1
Rs = The series resistance from Table 1
Figure 1
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.
+VIN
+VO
2,3,4
9,10,11
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.
Vin PT6440
GND Vo(adj)
5–8 12
Vo
(R1)
Adj Down
3. For each model, adjustments to the output voltage may
place additional limits on the minimum input voltage.
The revised minimum input voltage must comply with the
following requirement.
+
+
C1
C2
R2
Adjust Up
COM
COM
Vin(min) = (Va + 0.5)V or as specified in the data sheet,
whichever is greater.
Table 1
ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. #
PT6441
PT6442
PT6443
PT6444
PT6445
PT6446
PT6447
V
o
V
a
V
a
R
o
R
s
(nom)
(min)
(max)
(kΩ)
3.3
2.88
3.5
2.5
1.97
2.95
10.0
20.0
2.0
1.64
2.45
10.0
20.0
1.8
1.5
1.5
1.3
1.2
1.08
1.65
10.0
20.0
1.0
0.97
1.45
10.2
20.0
2.25
10.0
20.0
1.95
10.0
20.0
10.0
49.9
(kΩ)
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT6440 Series
Table 2
ISR ADJUSTMENT RESISTOR VALUES
Series Pt. #
Vo (nom)
PT6441
3.3
PT6442
2.5
PT6443
2.0
PT6444
1.8
PT6445
1.5
PT6446
1.2
PT6447
1.0
Va (req.d)
0.97
1.0
(0.4)kΩ
1.05
1.1
164.0kΩ
71.8kΩ
41.2kΩ
25.9kΩ
16.7kΩ
10.6kΩ
6.2kΩ
(0.0)kΩ
1.15
1.2
(30.0)kΩ
1.25
1.3
160.0kΩ
70.0kΩ
40.0kΩ
25.0kΩ
16.0kΩ
10.0kΩ
5.7kΩ
(0.0)kΩ
(10.0)kΩ
(30.0)kΩ
(90.0)kΩ
1.35
1.4
3.0kΩ
1.45
1.5
0.4kΩ
(0.0)kΩ
(6.0)kΩ
1.55
1.6
160.0kΩ
70.0kΩ
40.0kΩ
25.0kΩ
16.0kΩ
10.0kΩ
5.7kΩ
(15.0)kΩ
(30.0)kΩ
(60.0)kΩ
(150.0)kΩ
2.5kΩ
1.65
1.7
(1.4)kΩ
(6.7)kΩ
0.0kΩ
1.75
1.8
(14.0)kΩ
(25.0)kΩ
(43.3)kΩ
(80.0)kΩ
(190.0)kΩ
1.85
1.9
160.0kΩ
70.0kΩ
40.0kΩ
25.0kΩ
16.0kΩ
10.0kΩ
5.7kΩ
2.5kΩ
1.95
2.0
0.0kΩ
(2.0)kΩ
(5.6)kΩ
2.05
2.1
160.0kΩ
70.0kΩ
40.0kΩ
25.0kΩ
16.0kΩ
10.0kΩ
5.7kΩ
(10.0)kΩ
(15.7)kΩ
(23.3)kΩ
(34.0)kΩ
(50.0)kΩ
(76.7)kΩ
(130.0)kΩ
(284.0)kΩ
2.15
2.2
2.5kΩ
2.25
2.3
0.0kΩ
2.35
2.4
2.5kΩ
2.45
2.5
0.0kΩ
2.55
2.6
160.0kΩ
70.0kΩ
40.0kΩ
25.0kΩ
16.0kΩ
10.0kΩ
5.7kΩ
2.65
2.7
2.75
2.8
2.85
2.9
(0.0kΩ
(8.5)kΩ
2.5kΩ
2.95
3.0
0.0kΩ
(20.1)kΩ
(36.1)kΩ
(60.1)kΩ
(100.0)kΩ
(180.0)kΩ
(420.0)kΩ
3.05
3.1
3.15
3.2
3.25
3.3
3.35
3.4
130.0kΩ
40.1kΩ
3.45
3.48
R1 = (Blue)
10.1kΩ
0.0kΩ
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6440 Series
Using the Inhibit Function on the PT6440
Excalibur 5V/3.3V Bus Step-Down ISRs
For applications requiring output voltage On/Off control,
the 12-pin PT6440 series products incorporate an Inhibit
function. This function may be used wherever there is a
requirement for the module to be switched off. The
function is provided by the Inhibit control (pin 1) input.
Turn-On Time: In the circuit of Figure 1, turning Q1 on
applies a low-voltage to the Inhibit control (pin 1) and
disables the regulator output. Correspondingly, turning
Q1 off allows the Inhibit control pin to be pulled high by
its internal pull-up resistor. The ISR produces a fully
regulated output voltage within 10 milliseconds of the
release of the Inhibit control pin. The actual turn-on
time will vary with input voltage, output load, and the
total amount of load capacitance. Figure 2 shows the
typical rise in both output voltage and input current for a
PT6441 (3.3V) following the turn-off of Q1 at time t =0.
The waveform was measured with a 5Vdc input voltage,
and 6 Adc resistive load.
1
The ISR functions normally with pin 1 open-circuit,
providing a regulated output whenever a valid source
voltage is applied to Vin, (pins 2–4), with respect to GND
(pins 5–8). When a low-level ground signal is applied
to pin 1, the regulator output is disabled.
Figure 1 shows an application schematic, which details
the typical use 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-
Figure 2
2
drain device is required to control this pin.
VO (2V/Div)
IIN (2A/Div)
The Inhibit pin control thresholds are given in Table 1.
Equation 1 may be used to determine the approximate
current drawn from the input source, and by Q1 when the
regulator is placed in the inhibit state.
3
Table 1; Inhibit Control Requirements
Parameter
Min
– 0.5
Max
VINH (5V/Div)
Enable (V
)
V
V
in
0.5V
IH
Disable (V
in
-0.2V
)
IL
Transition Time
4
10µs
-1
0
1
2
3
4
5
6
7
8
9
10
t (milliseconds)
Equation 1; Off Input Current
Notes:
Istby
= Vin ÷ 10kΩ
20%
1. Use an open-collector device (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 +0.5VDC.
Figure 1
2. Do not control the Inhibit input with an external DC
voltage. This will lead to erratic operation of the ISR and
may over-stress the regulator.
+5V
+2.5V
2,3,4
Vin
9, 10, 11
V o
PT6442
3. Avoid capacitance greater than 500pF at the Inhibit
control pin. Excessive capacitance at this pin will cause the
ISR to produce a pulse on the output voltage bus at turn-
on.
Inhibit*
1
GND
V o(adj)
5 – 8
1 2
+
+
C in
C out
4. Keep the On/Off transition to less than 10µs. This
prevents erratic operation of the ISR, which could cause
the output voltage to be momentarily higher than normal.
C O M
C O M
Q 1
B S S 1 3 8
Inhibit
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