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PT7671

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品牌：TI

描述：30-A Programmable Integrated Switching Regulator

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PT7671 概述

30-A Programmable Integrated Switching Regulator 30 -A可编程集成开关稳压器

PT7671 数据手册

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PT7671—5 V

30-A Programmable

Integrated Switching Regulator

SLTS176A - NOVEMBER 2002 - REVISED JUNE 2003

Features

• 5 V Input Voltage

• Over-Temperature Protection

• 27-Pin Solderable Copper Case

• 1.57 in² PCB Area (‘N’ Suffix)

• IPC Lead-Free 2

• 30 A Output Current

• 5-bit Programmable Output:

1.3 V to 3.5 V

• 93 % Efficiency

• Differential Remote Sense

• Over-Current Protection

Description

Ordering Information

PT7671o = 1.3 to 3.5 Volts

The PT7671 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 PT7671 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 PT7671 operates from a

+5-V input bus and produces a tightly

regulated output voltage that is pro-

grammable over the range, 1.3 V to

3.5 V. The output voltage is selected via

5-bit input code, which is compatible

with VRM specifications.

The PT7671 is most suitable for

powering high-end DSP, ASIC, and

microprocessor circuits that require

core or I/O logic supply voltages as low

as 1.3 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 PT7671 is also pin compatible

with the 20-A rated PT7711.

PT Series Suffix

(PT1234x)

Case/Pin

Order Package

Configuration Suffix

Code

Vertical

Horizontal

SMD

(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(+)

V_OUT

20–25

C_OUT

7–11

V_IN

PT7671

1 µH

13–19

C_IN

GND

SENSE(–)

STBY

C_in= Required 1500 µF electrolytic

C_out= 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

PT7671—5 V

30-A Programmable

Integrated Switching Regulator

SLTS176A - NOVEMBER 2002 - 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

VID0

VID1

VID2

VID3

STBY *

VID4

2.00 V

2.10 V

2.20 V

2.30 V

2.40 V

2.50 V

2.60 V

2.70 V

2.80 V

2.90 V

3.00 V

3.10 V

3.20 V

3.30 V

3.40 V

3.50 V

1.30 V

1.35 V

1.40 V

1.45 V

1.50 V

1.55 V

1.60 V

1.65 V

1.70 V

1.75 V

1.80 V

1.85 V

1.90 V

1.95 V

2.00 V

2.05 V

out

26 Sense(+)

27 Do not connect

12 Sense(–)

13 GND

14 GND

Logic 0 = Pin 12 potential (Rem Sense Gnd)

Logic 1 = Open circuit (no pull-up resistors)

VID 3 & VID4 must not be changed while the unit is operating.

* For STBY pin: open =output enabled

ground =output disabled.

Pin Descriptions

Vin: The positive input voltage power node to the mod-

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.

ule, which is referenced to common GND.

GND: This is the common ground connection for the

‘V_in’ and ‘V_out’ power connections. It is also the 0 VDC

reference for the ‘STBY’ control input.

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.

STBY: The STBY pin is an open-collector/drain nega-

tive 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(–): 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

VID4, is either connected to ‘Sense(–)’ or left open circuit.

For technical support and more information, see inside back cover or visit www.ti.com

PT7671—5 V

30-A Programmable

Integrated Switching Regulator

SLTS176A - NOVEMBER 2002 - REVISED JUNE 2003

Specifications (Unless otherwise stated, T_a=25 °C, V_in=5 V, C_in=1,500 µF, C_out=330 µF, V_o=3.3 V, and I_o=I_omax)

PT7671

Typ

Characteristics

Symbols

Conditions

Min

Max

Units

Output Current

I^o

T_a= 60 °C, 200LFM, pkg N

Ta = 25 °C, Natural convection

—

Input Voltage Range

Set-Point Voltage Tolerance

Temperature Variation

Line Regulation

Vin

Over I_orange

4.5

—

5.5

—

(1)

V_otol

Reg_temp

Regline

Regload

∆V_otol

All output voltages

–40 °C ≤T_a≤+85 °C, I_o=I_omin

Over Vin range

%V_o

Load Regulation

Over I_orange

Total Output Voltage Variation

Includes set-point, line, load,

—

1.5

2.5

%V_o

–40 °C ≤T_a≤+85 °C

Efficiency

I^o=15 A

Vo =3.3 V

V^o=2.5 V

Vo =1.8 V

—

I^o=30 A

Vo =3.3 V

V^o=2.5 V

Vo =1.8 V

—

Vo Ripple (pk-pk)

20 MHz bandwidth

—

mV_pp

µSec

Transient Response

ttr

1 A/µs load step, 50 % and 100 % I_omax

Vo over/undershoot

—

(2)

Vos

I_TRIP

ƒs

—

200

—

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

V_IH

V_IL

Referenced to GND

2.0

—

Input Low Voltage

-0.2

Input Low Current

Standby Input Current

External Capacitance

Operating Temperature Range

Solder Reflow Temperature

Storage Temperature

Reliability

I_IL

Pin 5 to GND

—

–0.3

—

µF

°C

I_instandby

C_out

—

(4)

330

–40

—

15,000

(5)

Over Vin Range

(6)

T_reflow

Surface temperature of module pins or case

—

215

–40

3.4

125

—

MTBF

Per Bellcore TR-332

10 Hrs

50 % stress, T_a=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)

Mechanical Vibration

Mil-STD-883D, Method 2007.2 Suffixes A, N

—

G’s

(7)

20-2000 Hz

Suffix C

Weight

—

Vertical/Horizontal

Materials meet UL 94V-0

—

grams

Flammability

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

PT7671—5 V

30-A Programmable

Integrated Switching Regulator

SLTS176A - NOVEMBER 2002 - REVISED JUNE 2003

Performance Characteristics, V_in=5 V (See Note A)

Safe Operating Area Curves (See Note B)

Efficiency vs Output Current

PT7671, V_IN=5 VDC, V_OUT=3.3 V

100

Airflow

V_OUT

3.3V

400LFM

200LFM

60LFM

2.5V

1.8V

Nat conv

Iout (A)

Ripple vs Output Current

PT7671, V_IN=5 VDC, V_OUT=2.5 V

100

Airflow

V_OUT

400LFM

200LFM

60LFM

3.3V

2.5V

1.8V

Nat conv

Iout (A)

Power Dissipation vs Output Current

V_OUT

3.3V

2.5V

1.8V

Iout (A)

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 V_outand 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

—

EEVFK1E222M

EEVFK1V331P

16 V

470

1500

0.090 Ω

0.043 Ω

755 mA

1690 mA

10×12.5

16×15

—

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

—

LXZ25VB331M10X12LL

LXZ16VB152M12X20LL

10FX680M

Nichicon PL Series

25 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

—

UPL1E391MHH6

UPL1A152MHH6

PNX1A331MCR1GS

NX (SMT)

Os-con SP (Radial)

SVP (SMT)

10 V

470

330

0.015 Ω

0.017 Ω

>4510 mA

>3950 mA

10×10.5

9×12×8.3

10SP470M

10SVP330M

AVX Tanatalum

TPS- Series

10 V

330

0.10 Ω

0.06 Ω

1414 mA

1826 mA

7.3L×4.3W

×4.1H

TPSV337M010R0100

TPSV337M010R0060

Sprague Tantalum

595D/594D

10 V

330

680

0.045÷4 =0.011 Ω

0.09 Ω

>4500 mA

>1510 mA

7.3L×5.7W

×4.0H

594D337X0010R2T

595D687X0010R2T

Kemet Tantalum

T510/T495 (SMT)

10 V

330

220

0.035 Ω

0.07÷2 =0.035 Ω

2000 mA

>2000 mA

4.3W×7.3L

×4.0H

510X337M010AS

T495X227M010AS

Sanyo Poscap

TPB (SMT)

10 V

220

0.04 Ω

3000 mA

7.2L ×4.3W

×3.1H

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 Q₁off 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 V_in(pins 7-11) with respect to

Turn-On Time: Turning Q₁in Fig. 3-1 off, removes the

GND (pins 13-19). Connecting pin 5 to ground will

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 Q₁at 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

Enable

Disable

2 V

–0.2 V

Open Cct.

0.8 V

Vo (2V/Div)

Iin (5A/Div)

I_{stby (low)}

Vstby (o/c)

0.5 mA

V_in

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 V_in. 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

VID3

VID0

Senes(+)

7–11

20–25

Vin

5 V

V_o=3.3 V

PT7671

STBY

GND

13–19

Senes(–)

C_in

C_out

Q ₁

BSS138

Inhibit

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 V_ce(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

connected to a precision resistor, and when pulled low

applies a weighted change to the output voltage. By

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

0:Connect

1:Open

12;

drain

Sense(–).

(See

circuit/open

Note

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

VID4 - VID0

SNS(+)

L₁

V_IN

V_OUT

20–25

7–11

V_IN

V_OUT

PT7671

1 µH

(Optional)

STBY

GND

SNS(–)

13–19

C_in

C_out

Q₁

STBY

COM

Sense(–)

Power GND

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IMPORTANT NOTICE

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PT7671 替代型号

型号	制造商	描述	替代类型	文档
PTH05030W	TI	30-A, 5-V Input Non-Isolated Wide-Output Adjust Power Modules	功能相似
PTH05T210W	TI	30-A, 5-V INPUT, NON-ISOLATED, WIDE OUTPUT ADJUST, POWER MODULE w/ TURBOTRANS	功能相似

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