PT7675 [TI]
30-A 5-Bit Programmable Integrated Switching Regulator;型号: | PT7675 |
厂家: | TEXAS INSTRUMENTS |
描述: | 30-A 5-Bit Programmable Integrated Switching Regulator |
文件: | 总12页 (文件大小:298K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
PT7675—5 V
30-A 5-Bit Programmable
Integrated Switching Regulator
SLTS186A - FEBRUARY 2003 - REVISED JUNE 2003
Features
• 5 V Input Voltage
• Over-Temperature Protection
• 27-Pin Solderable Copper Case
• 1.57 in² PCB Area (‘N’ Suffix)
• Surface Mountable
• 30 A Output Current
• 5-bit Programmable Output:
1.075 V to 1.85 V
• 89 % Efficiency
• Differential Remote Sense
• Over-Current Protection
• IPC Lead-Free 2
Description
Ordering Information
The PT7675 Excalibur™ high perfor-
mance integrated switching regulator
(ISR) is rated for up to 30 A. Housed in
a 27-pin, space-saving, solderable cop-
per package, the PT7675 delivers a
higher output current than many mod-
ules of similar size. This makes it an
ideal choice where both a high output
current and minimum board space are
desirable. The PT7675 operates from a
+5-V input bus and produces a tightly
regulated output voltage that is pro-
grammable over the range, 1.075 V to
1.85 V. The output voltage set-point is
selected via a 5-bit input code, which is
compatible with the specification for
VRM 9.0.
PT7675o = 1.075 to 1.85 Volts
The PT7675 is most suitable for
powering high-end DSP, ASIC, and
microprocessor circuits that require
core or I/O logic supply voltages as low
as 1.075 V.
Other features include output short-
circuit and over-temperature protection,
a standby control, and a differential
remote sense to compensate for voltage
drop between the regulator and load.
The PT7675 is also pin compatible
with the 20-A rated PT7715.
PT Series Suffix
(PT1234x)
Case/Pin
Order Package
Configuration Suffix
Code
Vertical
Horizontal
SMD
N
A
C
(ENE)
(ENF)
(ENG)
(Reference the applicable package code
drawing for the dimensions and PC
board layout)
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
SENSE(+)
6
4
3
2
1
26
12
L1
VOUT
20–25
COUT
7–11
VIN
PT7675
1 µH
L
O
A
D
+
+
5
13–19
CIN
GND
GND
SENSE(–)
STBY
Cin = Required 1500 µF electrolytic
Cout = Required 330 µF electrolytic
L1 = Optional 1 µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT7675—5 V
30-A 5-Bit Programmable
Integrated Switching Regulator
SLTS186A - FEBRUARY 2003 - REVISED JUNE 2003
Pin-Out Information
Pin Function
Programming Information
VID4=1
Vout
VID4=0
Vout
Pin Function
15 GND
16 GND
17 GND
18 GND
19 GND
VID3 VID2 VID1 VID0
1
VID0
VID1
VID2
VID3
STBY *
VID4
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1.075 V
1.100 V
1.125 V
1.150 V
1.175 V
1.200 V
1.225 V
1.250 V
1.275 V
1.300 V
1.325 V
1.350 V
1.375 V
1.400 V
1.425 V
1.450 V
1.475 V
1.500 V
1.525 V
1.550 V
1.575 V
1.600 V
1.625 V
1.650 V
1.675 V
1.700 V
1.725 V
1.750 V
1.775 V
1.800 V
1.825 V
1.850 V
2
3
4
5
20
21
22
23
24
25
V
out
V
out
V
out
V
out
V
out
V
out
6
7
V
in
V
in
V
in
V
in
V
in
8
9
10
11
26 Sense(+)
27 Do not connect
12 Sense(–)
13 GND
14 GND
Logic 0 = Pin 12 potential; Sense(– )
Logic 1 = Open circuit (no pull-up resistors)
* For STBY pin: open =output enabled
ground =output disabled.
VID4 must not be changed while the unit is operating.
Pin Descriptions
Vin: The positive input voltage power node to the mod-
ule, which is referenced to common GND.
VID4, must be either connected to ‘Sense(–)’ or left open
circuit.
GND: This is the common ground connection for the
‘Vin’ and ‘Vout’ power connections. It is also the 0 VDC
reference for the ‘STBY’ control input.
Vout: The regulated positive power output with respect
to the GND node. The set point voltage at this node is
defined by the status of the pins VID0 through VID4.
STBY*: The STBY pin is an open-collector/drain negative
logic input that is referenced to GND. Applying a low-
level ground signal to this input disables the module’s
output and places the regulator in “standby” mode. When
in standby, the input current drawn by the regulator is
significantly reduced. If the STBY input is left open-
circuit, the module will produce an output whenever a
valid input source is applied.
Sense(+): Provides the regulator with the capability to
regulate the set-point voltage at the load. When used
with ‘Sense(–)’, the regulation circuitry will compensate
for voltage drop between the converter and the load.
This pin may be left open circuit, but connecting it to
‘Vout’ will improve load regulation.
Sense(–): This is the logic ‘0’ reference for the inputs
VID0 through VID4. It also provides the regulator with a
differential remote sense capability when used with the
‘Sense(+)’ input. For optimum output voltage accuracy
this pin should always be connected to GND.
VID0–VID4: Selects the set-point output voltage of the
regulator according to the applicable program code (See
programming information). Each input, VID0 through
For technical support and more information, see inside back cover or visit www.ti.com
PT7675—5 V
30-A 5-Bit Programmable
Integrated Switching Regulator
SLTS186A - FEBRUARY 2003 - REVISED JUNE 2003
Specifications (Unless otherwise stated, Ta =25 °C, Vin =5 V, Cin =1,500 µF, Cout =330 µF, Vo =1.8 V, and Io =Iomax)
PT7675
Typ
Characteristics
Symbols
Conditions
Min
Max
Units
Output Current
Io
Ta = 60 °C, 200LFM, pkg N
Ta = 25 °C, Natural convection
0
0
—
—
30
29
A
Input Voltage Range
Set-Point Voltage Tolerance
Temperature Variation
Line Regulation
Vin
Over Io range
4.5
—
—
—
—
—
10
1
5.5
25
—
—
—
V
(1)
Vo tol
Regtemp
Regline
Regload
∆Vo tol
All output voltages
–40 °C ≤Ta ≤+85 °C, Io =Iomin
Over Vin range
mV
%Vo
mV
mV
5
Load Regulation
Over Io range
5
Total Output Voltage Variation
Includes set-point, line, load,
—
1.5
2.5
%Vo
%
–40°C ≤Ta ≤+85°C
Efficiency
η
Io =15 A
Vo =1.8 V
Vo =1.5 V
Vo =1.2 V
—
—
—
89
87
85
—
—
—
Io =30 A
Vo =1.8 V
Vo =1.5 V
Vo =1.2 V
—
—
—
84
82
79
—
—
—
%
Vo Ripple (pk-pk)
Vr
20 MHz bandwidth
—
40
25
—
mVpp
µSec
mV
A
Transient Response
ttr
1 A/µs load step, 50 % and 100 % Iomax
Vo over/undershoot
—
—
(2)
Vos
ITRIP
ƒs
—
200
38
—
Over-Current Threshold
Switching Frequency
Reset followed by auto-recovery
Over Vin range
—
—
250
300
350
kHz
STBY* Input Requirements
Input High Voltage
(3)
Open
0.8
VIH
VIL
Referenced to GND
2.0
—
—
V
Input Low Voltage
-0.2
Input Low Current
Standby Input Current
External Input Capacitance
External Capacitance
Operating Temperature Range
Solder Reflow Temperature
Storage Temperature
Reliability
IIL
Pin 5 to GND
Pin 5 to GND
—
–0.3
—
mA
mA
µF
µF
°C
°C
°C
Iin standby
Cin
—
6
—
—
1,500
—
—
—
—
—
—
(4)
Cout
330
–40
—
15,000
(5)
Ta
Over Vin Range
85
215
125
—
(6)
Treflow
Ts
Surface temperature of module pins or case
—
–40
3.4
6
MTBF
Per Bellcore TR-332
10 Hrs
50 % stress, Ta =40 °C, ground benign
Mechanical Shock
—
—
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
—
500
—
G’s
(7)
(7)
Mechanical Vibration
Mil-STD-883D, Method 2007.2
20-2000 Hz
Suffixes A
Suffix C, N
—
—
20
20
—
—
G’s
Weight
—
—
Vertical/Horizontal
—
36
—
grams
Flammability
Materials meet UL 94V-0
Notes: (1) If the remote sense ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
(2) The transient response may be improved by placing additional capacitors with low equivalent series resistance (ESR) on the output.
(3) The STBY* control (pin 5) has an internal pull-up. If it is left open-circuit, the module will operate when input power is applied. A low-leakage (<1 µA)
MOSFET must be used to control this pin. The open-circuit voltage may be as high as Vin.
(4) For operation below 0 °C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
(5) See safe Operating Area curves or consult factory for the appropriate derating.
(6) During 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 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.
External Capacitors: The regulator require a minimum output capacitance of 330 µF for proper operation. An input capacitance of 1500 µF is also required. This
must be rated for a minimum of 1.1 Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further informa-
tion refer to the application note regarding capacitor selection for this product.
Input Filter: An input filter inductor is optional for most applications. The inductor must be sized to handle 30 ADC with a typical value of 1 µH.
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT7675—5 V
30-A 5-Bit Programmable
Integrated Switching Regulator
SLTS186A - FEBRUARY 2003 - REVISED JUNE 2003
Performance Characteristics, Vin =5 V (See Note A)
Safe Operating Area Curves (See Note B)
PT7675, VIN =5 VDC, VOUT =1.2 V
Efficiency vs Output Current
90
80
70
60
50
40
30
20
100
90
80
70
60
50
Airflow
VOUT
400LFM
200LFM
100LFM
Nat conv
1.8V
1.5V
1.2V
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Iout - Amps
Iout (A)
Ripple vs Output Current
100
80
60
40
20
0
VOUT
1.8V
1.5V
1.2V
0
5
10
15
20
25
30
Iout - Amps
Power Dissipation vs Output Current
12
10
8
VOUT
1.8V
1.5V
1.2V
6
4
2
0
0
5
10
15
20
25
30
Iout - Amps
Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical for the ISR.
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
PT7670 Series
Operating Features and System Considerations
for the PT7670 Series of ISRs
Power up & Soft-Start Timing
sense pins disconnected will not damage the regulator.
An internal 15 Ω resistor, connected between each sense
pin and its corresponding output node, keeps the output
voltage in regulation. If the remote sense feature is not
used it is important to at least connect the Sense(–) pin
to GND locally, as this provides a return path for the
regulator’s internal bias currents.
Following either the application of a valid input source
voltage, or the removal of a ground signal to the STBY
control pin (with input power applied), the regulator will
initiate a soft-start power up. The soft start slows the
rate at which the output voltage rises, and also introduces a
short time delay of approx. 10ms. Figure 1-1 shows the
power-up characteristic of a PT7671 with a 15-A load,
and with the output voltage programmed to 3.3 V.
With the sense leads connected, the difference between
the voltage measured between the Vout and GND pins,
and that measured between the Sense(+) and Sense(–)
pins, is the amount of IR drop being compensated by the
regulator. This should be limited to 0.6 V. (0.3 V maximum
between pins 25 & 26, and also between pins 12 & 13).
Figure 1-1
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 (2V/Div)
Iin (10A/Div)
Vin (2V/Div)
Over-Temperature Protection
The PT7670 series of ISRs incorporates an on-board
temperature sensor, which protects the module’s internal
circuitry against excessively high temperatures. A rise in
the temperature of the internal components may be the
result of a drop in airflow, or a high ambient temperature.
If the module’s internal temperature exceeds its OTP
threshold (see data sheet specifications), the regulator
output is disabled and the output voltage is reduced to
zero. The recovery is automatic, and begins with a soft-
start power up. It occurs when the the sensed temperature
decreases by about 10 °C below the trip point.
HORIZ SCALE: 10ms/Div
Over-Current Protection
To protect against load faults, the PT7670 series of regula-
tors incorporates output over-current protection. Applying
a load that exceeds the regulator’s 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 the 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.
Note: The over-temperature protection is a last resort mecha-
nism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recom-
mended and will reduce the long-term reliability of the module.
Always operate the regulator within the specified Safe Operating
Area (SOA) limits for the worst-case conditions of ambient
temperature and airflow.
Differential Remote Sense
Connecting the Sense(+) and Sense(-) pins to the load
circuit allows the regulator to compensate for limited
amounts of ‘IR’ voltage drop. This voltage drop is caused
by current flowing through the trace resistance between
the power converter and the ‘point of regulation’ some
distance away. Although not recommended, leaving the
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT7670 Series
Capacitor Recommendations for the PT7670
Series of 30-A Switching Regulators
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 also 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.
Input Capacitor:
The recommended input capacitor is determined by a
minimum of 1,500 µF of capacitance with a ripple cur-
rent rating of 1.1 Arms.
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 twice 2 × (the maximum
DC voltage + AC ripple). This is necessary to insure
reliability for input voltage bus applications.
Capacitor Table
Table 2-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple cur-
rent (rms) ratings. The number of capacitors required at
both the input and output buses is identified for each
capacitor type.
Output Capacitors:
The ESR of the required capacitors is less than 100 mΩ.
Electrolytic capacitors have marginal ripple performance
at frequencies greater than 400 kHz 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.
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 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
Maximum Ripple
Current @105 °C
(Irms)
Physical Size
(mm)
Input
Bus
Output
Bus
Vendor Number
Panasonic FK (SMT)
FC (Radial)
25 V
35 V
2200
330
0.038 Ω
0.080 Ω
1800 mA
850 mA
16×16.5
10×10.2
1
—
1
1
EEVFK1E222M
EEVFK1V331P
16 V
16 V
470
1500
0.090 Ω
0.043 Ω
755 mA
1690 mA
10×12.5
16×15
—
1
1
1
EEUFC1C471
EEUFC1C152S
United Chemi -Con
LXZ
25 V
16 V
10 V
330
1500
680
0.090 Ω
0.038 Ω
0.015 Ω
760 mA
1660 mA
4735 mA
10×12.5
12.5×20
10×10.5
—
1
2
1
1
1
LXZ25VB331M10X12LL
LXZ16VB152M12X20LL
10FX680M
FX
Nichicon PL Series
25 V
10 V
10 V
390
1500
330
0.080 Ω
0.050 Ω
0.024 Ω
720 mA
1330 mA
3770 mA
12.5×15
16×15
10×8
—
1
5
1
1
1
UPL1E391MHH6
UPL1A152MHH6
PNX1A331MCR1GS
NX (SMT)
Os-con SP (Radial)
SVP (SMT)
10 V
10 V
470
330
0.015 Ω
0.017 Ω
>4510 mA
>3950 mA
10×10.5
9×12×8.3
3
4
1
1
10SP470M
10SVP330M
AVX Tanatalum
TPS- Series
10 V
10 V
330
330
0.10 Ω
0.06 Ω
1414 mA
1826 mA
7.3L×4.3W
×4.1H
5
5
1
1
TPSV337M010R0100
TPSV337M010R0060
Sprague Tantalum
595D/594D
10 V
10 V
330
680
0.045÷4 =0.011 Ω
0.09 Ω
>4500 mA
>1510 mA
7.3L×5.7W
×4.0H
5
2
1
1
594D337X0010R2T
595D687X0010R2T
Kemet Tantalum
T510/T495 (SMT)
10 V
10 V
330
220
0.035 Ω
0.07÷2 =0.035 Ω
2000 mA
>2000 mA
4.3W×7.3L
×4.0H
5
6
1
2
510X337M010AS
T495X227M010AS
Sanyo Poscap
TPB (SMT)
10 V
220
0.04 Ω
3000 mA
7.2L ×4.3W
×3.1H
6
2
10TPB220M
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT7670 Series
Using the Standby Function on the PT7670
Series of 30-A Switching Regulators
2. In the standby mode the output of the regulator is tri-
state, and the output voltage falls at the rate that the
load circuit discharges the output filter capacitors.
For applications requiring On/Off control of the output
voltage, the 30-A rated PT7670 series of Excalibur ISRs
incorporate an on/off “Standby” function. This feature
may be used for power-up/shutdown sequencing, or to
change the output voltage while input power is applied.
See related notes: “Pin-Coded Output Voltage Adjustment
of the PT7670 Series of 30-A ISRs.”
3. When the ground signal to the Standby 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 output bus, it will sink current and
possibly over-stress the part.
4. The turn-off time of Q1, or rise time of the standby input
is not critical. Turning Q1 off slowly will not affect regulator
operation. However, a slow turn-off time will increase
both the initial delay and rise-time of the output voltage.
The standby function is provided by the STBY* control,
pin 5. If pin 5 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to Vin (pins 7-11) with respect to
1
Turn-On Time: Turning Q1 in Fig. 3-1 off, removes the
GND (pins 13-19). Connecting pin 5 to ground will
3
2
low-voltage signal at pin 5 and enables the output . Af-
disable the regulator output . This places the regulator
ter a delay of less than 5 ms, the output voltage rises to
full regulation within 30 ms 4. Fig. 3-2 shows the typical
output voltage waveform of a PT7671 following the
turn-off of Q1 at time t =0 secs. In the circuit of Fig. 3-1,
the output voltage is set to 3.3 V. The waveform was
measured with a +5-V input source voltage, and 15-A
output load.
in standby mode, and reduces the input current to typically
6mA. If a ground signal is applied to pin 5 prior to power-
up, the regulator output will remain inactive during the
period that input power is applied.
The standby input must be controlled with an open-
collector (or open-drain) discrete transistor (See Figure
3-1). Table 3-1 gives the input requirements.
Figure 3-2
Table 3-1 Standby Control Input Requirements
Parameter
Min
Typ
Max
1
Enable
Disable
2 V
–0.2 V
Open Cct.
0.8 V
Vo (2V/Div)
Iin (5A/Div)
Istby (low)
Vstby (o/c)
0.5 mA
Vin
Notes:
1. The Standby input of the PT7670 series of regulators
should be controlled using an open-collector (or open-
drain) discrete transistor. Do Not use a pull-up resistor. The
control input has an open-circuit voltage equal to Vin. To
set the regulator output to zero, the control pin must be
“pulled” to less than 0.8Vdc with a 0.5mA sink to ground.
Vstby (5V/Div)
HORIZ SCALE: 5ms/Div
Figure 3-1
26
4
3
2
1
VID3
-
VID0
Senes(+)
7–11
20–25
Vin
Vo
5 V
Vo =3.3 V
PT7671
STBY
GND
13–19
Senes(–)
5
12
L
O
A
+
+
Cin
Cout
D
Q 1
BSS138
Inhibit
COM
COM
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT7670 Series
Pin-Coded Output Voltage Adjustment of the
PT7670 Series of 30-A Switching Regulators
4. If active devices are used to ground the voltage control
pins, low-level open drain MOSFET devices should be
used over bipolar transistors. The inherent Vce(sat) in
bipolar devices introduces errors in the device’s internal
divider network. Discrete transistors such as the BSS138,
2N7002, or IRLML2402 are examples of appropriate
devices.
The PT7670 Excalibur™ family of converters use a pin
code to adjust the output voltage. This feature uses the
control inputs, VID0–VID4 (pins 1–6). When these pins
are left open-circuit, the ISR regulates at its default output
voltage. Each of the programming pins are internally
1
connected to a precision resistor, and when pulled low
applies a weighted change to the output voltage. By
2
selectively connecting VID0–VID4 to Sense(–) , the
output voltage of these ISRs can be programmed in
incremental steps over their specified output voltage
range. The program codes and output voltages offered
by these ISRs are compatible with the Voltage ID
specifications used by popular microprocessors. See
Figure 4-1 for the connection schematic, and the
respective device data sheet for the programming code
information.
Active Voltage Programming:
Special precautions should be taken when making changes
to the output voltage progam code while the unit is
powered. This activity can induce current transients
through the device as a result of the electrolytic output
capacitors being either charged or discharged to the new
output voltage set-point. The transient current can be
minimized by making only incremental changes to the
binary code, i.e. one LSB at a time. A minimum of 100µs
settling time between each program state is also recom-
mended. Making non-incremental changes to VID3 or
VID4 is discouraged.
Notes:
1. The programming convention is as follows:-
Logic
Logic
0:Connect
1:Open
to
pin
12;
drain
Sense(–).
(See
circuit/open
Note
2)
When active devices are used to program the output
voltage, their state should be asserted prior to the input
power being applied. One approach is to pull STBY (pin 5)
control to GND prior to power up. After the host board
has then asserted the program code, the ground signal
to pin 5 can be removed. This will allow the regulator to
intiate a clean soft-start power-up to the desired program
voltage. For more information on the use of the Standby
function, consult the related application note, “Using
the Standby Function on the PT7670 Series of 30-A
Switching Regulators.”
2. For optimal output voltage accuracy Sense(–) (pin 12)
should always be used as the logic ‘0’ reference. The
input/output ground (pins 13-19) can also be used if
pin 12 is connected to pin 13 external to the module.
3. Do not connect pull-up resistors to the voltage
programming pins.
Figure 4-1
6
4
3
2
1
26
VID4 - VID0
SNS(+)
L1
VIN
VOUT
20–25
7–11
VIN
VOUT
PT7671
1 µH
(Optional)
STBY
GND
SNS(–)
5
13–19
12
L
O
A
D
+
+
Cin
Cout
Q1
STBY
COM
Sense(–)
Power GND
For technical support and more information, see inside back cover or visit www.ti.com
MECHANICAL DATA
MMSI031 – SEPTEMBER 2001
ENE (R–MSIP–T27)
METAL SINGLE-IN-LINE MODULE
Suffix N
0.66 (16,76) MAX.
0.500 (12,70)
3.00 (76,20) MAX.
1
Note G
0.025 (0,63) TYP.
1.02 (25,90)
MAX.
0.017 (0,43) TYP.
0.100 (2,54) TYP.
0.160 (4,06) TYP.
0.050 (1,27) TYP.
0.050 (1,27) TYP.
0.140 (3,55) MIN.
See Note F
3.028 (76,91)
2.928 (74,37)
0.050 (1,27)
0.110 (2,79)
Note E
0.54 (13,71)
0.350 (8,89)
0.70 (17,78)
0.040 (1,01)
1
ø0.045 (1,14) MIN. 27 Places
Plated through
0.090 (2,28)
2 Places
0.100 (2,54) 26 Places
0.164 (4,16)
ø0.093 (2,36) MIN. 4 Places
Plated through holes.
See Note G.
PC Layout
4203526/A 08/01
NOTES: A. All linear dimensions are in inches (mm).
B. This drawing is subject to change without notice.
C. 2 place decimals are ꢀ0.030 (ꢀ0,76mm).
D. 3 place decimals are ꢀ0.010 (ꢀ0,25mm).
E. Recommended mechanical keep out area.
F. Electrical pin length mounted on printed circuit board, from seating plane to pin end.
G. The case may be electrically connected to power ground plane.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
MMSI032 – SEPTEMBER 2001
ENF (R–MSIP–T27)
METAL SINGLE-IN-LINE MODULE
Suffix A
1.19 (30,22)
MAX.
1.02 (25,90)
MAX.
3.00 (76,20) MAX.
Note G
0.025 (0,63) TYP.
0.017 (0,43) TYP.
0.100 (2,54) TYP.
1
0.500 (12,70)
0.160 (4,06) TYP.
0.050 (1,27) TYP.
0.050 (1,27) TYP.
0.140 (3,55) MIN.
See Note F
3.028 (76,91)
2.928 (74,37)
0.050 (1,27)
0.080 (2,03)
Note H
Note E
4 Places
0.840
(21,33)
0.160 (4,06)
0.110 (2,79)
0.935
(23,75)
1
ø0.093 (2,36) MIN. 4 Places
Plated through holes.
See note G.
0.040 (1,01)
0.280 (7,11)
0.090 (2,28)
2 Places
ø0.045 (1,14) MIN. 27 Places
Plated through
0.100 (2,54) 26 Places
0.164 (4,16)
PC LAYOUT
4203527/A 08/01
NOTES: A. All linear dimensions are in inches (mm).
B. This drawing is subject to change without notice.
C. 2 place decimals are ±0.030 (±0,76mm).
D. 3 place decimals are ±0.010 (±0,25mm).
E. Recommended mechanical keep out area.
F. Electrical pin length mounted on printed circuit board, from seating plane to pin end.
G. The case may be electrically connected to power ground plane.
H. Case outline reference.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
MMSI033 – SEPTEMBER 2001
ENG (R–MSIP–G27)
METAL SINGLE-IN-LINE MODULE
Suffix C
1.19 (30,22)
MAX.
1.02 (25,90)
MAX.
3.00 (76,20) MAX.
1
0.500 (12,70)
0.025 (0,63) TYP.
0.100 (2,54) TYP.
0.160 (4,06) TYP.
Detail ”A”
0.050 (1,27) TYP.
0.050 (1,27) TYP.
3.028 (76,91)
2.928 (74,37)
0.050 (1,27)
0.047 (1,19)
Note I
0.230 (5,84)
0.840
(21,33)
1.020
(25,90)
0.210 (5,33)
Note H
1
0.050 (1,27)
0.165 (4,19)
Note E
0.040 (1,01)
0.280 (7,11)
0.050 (1,27) 27 Places
0.100 (2,54) 26 Places
0.090 (2,28)
2 Places
0.164 (4,16)
PC LAYOUT
0.100 (2,54)
0.050 (1,27)
0.017 (0,43) TYP.
ø0.093 (2,36) MIN. 4 Places
Plated through holes.
See Note G.
Gage Plane
0.140
(3,55)
Seating Plane
0.006 (0,15)
0.090 (2,28)
0.070 (1,77)
0°–6°
0.080 (2,03)
Note F
Note G
0.100 (2,54)
Detail ”A”
4203528/A 08/01
NOTES: A. All linear dimensions are in inches (mm).
B. This drawing is subject to change without notice.
C. 2 place decimals are ꢀ0.030 (ꢀ0,76mm).
D. 3 place decimals are ꢀ0.010 (ꢀ0,25mm).
E. Recommended mechanical keep out area.
F. Vias are recommended to improve copper adhesion.
G. Solder mask openings to copper island for solder joints to mechanical pins. Electrically connect case to power ground plane.
H. Power pin connections should utilize two or more vias per input, ground and output pin.
I. Case outline reference.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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相关型号:
PT7681A
30A SWITCHING REGULATOR, 350kHz SWITCHING FREQ-MAX, MSMA27, ROHS COMPLIANT, METAL, SIP-27
TI
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