PT6933A [TI]

Analog IC ; 模拟IC\n


型号：	PT6933A
厂家：	TEXAS INSTRUMENTS
描述：	Analog IC 模拟IC\n 模拟IC
文件：	总7页 (文件大小：161K)
中文：	中文翻译
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PT6930 Series

8-A5V-Input Dual-Output

Integrated Switching Regulator

SLTS062B

(Revised 7/20/2001)

Features

• Dual Outputs:

Description

The PT6930 Excalibur™ series of 8-A

dual-output ISRs are designed to power

DSP ICs. Both output voltages are inde-

pendently adjustable with external resistors.

The second output may also be set to an

alternate lower bus voltage with a simple

pin strap. Internal power sequencing of

both outputs, during both power-up and

power-down, meets the requirements of

most DSP chipsets.

+3.3V/2.5V

+3.3V/1.5V

+3.3V/1.8V

• Adjustable Output Voltages

• Remote Sense (both outputs)

• Standby Function

• Over-Temperature Protection

• Soft-Start

• Internal Sequencing

• 23-pin Excalibur™ Package

Pin-Out Information

Pin Function

Ordering Information

PT 6931o = +3.3 Volts

Pin Function

+2.5/1.8 Volts

PT 6932o = +3.3 Volts

+1.5/1.2 Volts

PT 6933o = +3.3 Volts

+1.8/1.2 Volts

Standard Application

Vo₁Sense

No Connect

STBY

V_IN

Vo₁

Vo₂Sense

Vo₁Sense

Vo₁

STBY

Vo₁Adjust

No Connect

Vo₂

Vo₁

18-21

12-15

V_IN

4,5,6

PT6930

V_IN

GND

Vo₁

Vo₂

PT Series Suffix

(PT1234X)

7-11

C₃

C₁

Vo₂

Case/Pin

Configuration

C₂

Vo₂

GND

Vertical Through-Hole

Horizontal Through-Hole

Horizontal Surface Mount

Vo₂Sense

Vo₂Adjust*

C₁/C₂=Req’d 330µF electrolytic (See table footnotes)

C₃=Optional 100µF electrolytic

(For dimensions and PC board layout, see

Package Styles 1320 and 1330).

* Note:Vo₁& Vo₂Adjust can be pin-strapped to an

alternative lower bus voltage. Consult the voltage

adjustment application note for more information.

Specifications

PT6930 SERIES

Characteristics

(T_a= 25°C unless noted)

Symbols

Conditions

Min

Typ

Max

Units

(1)

(2)

Output Current

Io₁, Io₂

T_a= +60°C, 200 LFM, pkg N

T_a= +25°C, natural convection

0.1A ≤ I_o≤ I_typ

Vo₁=3.3V

Vo₂=2.5V

Vo₂=1.8V

Vo₂=1.5V

Vo₁=1.2V

0.1

—

5.5

(2)

—

2.2

1.75

1.45

1.2

(1)

(2)

Vo₁=3.3V

Vo₂=2.5V

Vo₂=1.8V

Vo₂=1.5V

Vo₁=1.2V

0.1

—

6.0

2.2

1.75

1.45

1.2

Input Voltage Range

V_in

4.5

—

5.5

Output Voltage Tolerance

∆V_o

V_in= +5V, I_o=I_typ,both outputs

V^o-0.1

—

Vo+0.1

0°C ≤ T_a≤ +65°C

Line Regulation

Load Regulation

V_oRipple/Noise

Reg_line

Reg_load

V_n

4.5V ≤ V_in≤ 5.5V, I_o=I_typ

V_in= +5V, 0.1 ≤ I_o≤ I_typ

V_in= +5V, I_o=I_typ

Vo₁

Vo₂

—

Vo₁

Vo₂

—

Vo₁

Vo₂

—

Transient Response

with C₂= 330µF

t_tr

I_ostep between 0.5xI_typand I_typ

V_oover/undershoot

—

µSec

V_os

Vo₁

Vo₂

Efficiency

V_in= +5V, I_o=4A total

—

Switching Frequency

ƒ_o

4.5V ≤ V_in≤5.5V

0.1A ≤ I_o≤ I_typ

600

725

475

kHz

(Continued)

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

PT6930 Series

8-A 5V-Input Dual-Output

Integrated Switching Regulator

Specifications (From previous page)

PT6930 SERIES

Typ

Characteristics

(T_a= 25°C unless noted)

Symbols

Conditions

Min

Max

Units

Absolute Maximum

T_a

—

-40 ⁽³⁾

—

+85 ⁽⁴⁾

°C

Operating Temperature Range

Storage Temperature

Weight

T_s

—

-40

—

+125

—

°C

Vertical/Horizontal

grams

Notes: (1) I_omin current of 0.1A can be divided btween both outputs; Vo₁, or Vo₂. The ISR will operate down to no-load with reduced specifications.

(2) I_omax listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum.

(3) For operating temperatures below 0°C, use tantalum type capacitors at both the input and output.

(4) See Safe Operating Area curves for appropriate derating.

Input/Output Capacitors: The PT6930 series requires a minimumm capacitance of 330µF at both the input and Vo₁output for proper operation in all applications. In addition,

the input capacitor, C₁, must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic dynamic loads, additional capacitance may be required.

T Y P I C A L

C H A R A C T E R I S T I C S

Safe Operating Area @V_IN=5V (See Note B)

PT6930 Series Performance (See Note A)

PT6931 (Io₂fixed at 2.2A)

Total Efficiency vs Io₁; Io₂=Io₂(max)

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

V_OUT

200LFM

120LFM

60LFM

PT6931

PT6932

PT6933

Nat conv

0.0

1.0

2.0

3.0

4.0

5.0

6.0

Io₁(A) [ Io₂fixed at Io₂(max) ]

Io₁(A) [ Io₂fixed at 2.2A ]

Vo₁Ripple vs Io₁; Io₂=Io₂(max)

PT6931

PT6932

PT6933

Io₁(A) [ Io₂fixed at Io₂(max) ]

Total Power Dissipation vs Io₁; Io₂=Io₂(max)

PT6931

PT6932

PT6933

Io₁(A) [ Io₂fixed at Io₂(max) ]

Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.

Note B: SOA curves represent operating conditions at which internal components are at or below the manufactuer’s maximum rated operating temperatures.

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

Application Notes

PT6920/PT6930 Series

Adjusting the Output Voltage of the PT6920 and

PT6930 Dual Output Voltage ISRs

5. If Vo₁is increased above 3.3V, the minimum input voltage

to the ISR must also be increased. The minimum

required input voltage must be (Vo₁+ 1.2)V or 4.5V,

whichever is greater. Do not exceed 5.5V

Each output voltage from the PT6920 and PT6930 series

of ISRs can be independantly adjusted higher or lower than

the factory trimmed pre-set voltage. Vo₁or Vo₂may each

be adjusted either up or down using a single external resis-

6. Never connect capacitors to either the Vo₁Adjust or Vo₂

Adjust pins. Any capacitance added to these control pins

will affect the stability of the respective regulated output.

tor . Table 1 gives the adjustment range for both Vo₁and

Vo₂for each model in the series as V_a(min) and V_a(max).

7. Adjusting either voltage (Vo₁or Vo₂) may increase the

power dissipation in the regulator, and correspondingly

change the maximum current available at either output.

Consult the factory for application assistance.

Note that Vo₂must always be lower than Vo₁

Vo₁Adjust Up: To increase the output, add a resistor R4

between pin 16 (V₁Adjust) and pins 7-11 (GND) .

The adjust up and adjust down resistor values can also be

calculated using the following formulas. Be sure to select

the correct formula parameter from Table 1 for the output

and model being adjusted.

Vo₁Adjust Down: Add a resistor (R3), between pin 16

(Vo₁Adjust) and pin 1 (Vo₁Sense) .

Vo₂Adjust Up: Add a resistor R2 between pin 23

(Vo₂Adjust) and pins 7-11 (GND) .

R_o(V_a– V_r)

V_o– V_a

(R1) or (R3)

– R_skΩ

Vo₂Adjust Down: Add a resistor (R1) between pin 23

(Vo₂Adjust) and pin 22 (Vo₂Sense) .

V_r. R_o

V_a– V_o

R2 or R4

Where:

– R_s

kΩ

Refer to Figure 1 and Table 2 for both the placement and value of

the required resistor.

V_o= Original output voltage, (Vo₁or Vo₂)

V_a= Adjusted output voltage

V_r= The reference voltage from Table 1

R_o= The resistance value from Table 1

R_s= The series resistance from Table 1

Notes:

1. The output voltages, Vo₁and Vo₂, may be adjusted

independantly.

Table 1

PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS

2. Use only a single 1% resistor in either the (R3) or R4

location to adjust Vo₁, and in the (R1) or R2 location to

adjust Vo₂. Place the resistor as close to the ISR as

possible.

Output Bus

Series Pt #

Vo₁

Vo₂

Standard Case

Excalibur Case

Adj. Resistor

PT6921/22

PT6931/32

(R3)/R4

PT6921

PT6931

(R1)/R2

PT6922

PT6932

(R1)/R2

PT6933

(R1)/R2

3. Vo₂must always be at least 0.2V lower than Vo₁.

4. Vo₂on both the PT6921 and PT6931 models may be

adjusted from 2.5V to 1.8V by simply connecting pin

22 (Vo₂Sense) to pin 23 (Vo₂Adjust). For more

details, consult the data sheet.

V (nom)

3.3V

2.3V

3.6V

1.02V

12.1

2.5V

1.8V

3.0V

1.0V

10.0

1.5V

1.2V

3.0V

1.0V

9.76

6.49

1.8V

1.2V

3.0V

1.0V

10.0

Va(min)

Va(max)

(kΩ)

12.1

11.5

3.32

Figure 1

V₂(sns)

V₁(sns)

V2_out

V2_o

V1_o

4,5,6

Vin

PT6920

V1_out

GND

Vo₂(adj) Vo₁(adj)

23 16

STBY

- 11

(R3)

(R1)

Adj Down

C₁

C₂

C₃

Adjust Up

COM

Adjust V1_out

Adjust V2_out

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

Application Notes continued

PT6920/PT6930 Series

Table 2

PT6920/PT6930 ADJUSTMENT RESISTOR VALUES

Output Bus

Vo₁

Vo₂

Series Pt#

StandardCase PT6921/6922

ExcaliburCase PT6931/6932

PT6921

PT6931

(R1)/R2

2.5Vdc

PT6922

PT6932

(R1)/R2

1.5Vdc

PT6933

(R1)/R2

1.8Vdc

Adj Resistor

V_o(nom)

(R3)/R4

3.3Vdc

V (req’d)

1.2

(0.0)kΩ

(3.3)kΩ

(0.0)kΩ

(1.2)kΩ

1.25

1.3

(8.2)kΩ

(2.7)kΩ

1.35

1.4

(16.3)kΩ

(32.6)kΩ

(81.4)kΩ

(4.5)kΩ

(6.7)kΩ

1.45

1.5

(9.5)kΩ

(13.3)kΩ

(18.7)kΩ

(26.7)kΩ

(40.0)kΩ

(66.7)kΩ

(147.0)kΩ

1.55

1.6

189.0kΩ

91.1kΩ

58.6kΩ

42.3kΩ

32.6kΩ

26.0kΩ

21.4kΩ

17.9kΩ

15.2kΩ

13.0kΩ

11.3kΩ

9.8kΩ

8.5kΩ

7.5kΩ

6.5kΩ

5.7kΩ

5.0kΩ

4.4kΩ

3.8kΩ

3.3kΩ

2.8kΩ

2.4kΩ

2.0kΩ

1.6kΩ

1.3kΩ

1.0kΩ

0.7kΩ

0.5kΩ

0.2kΩ

0.0kΩ

1.65

1.7

1.75

1.8

(0.0)kΩ

(1.6)kΩ

1.85

1.9

197.0kΩ

96.7kΩ

63.3kΩ

46.7kΩ

36.7kΩ

30.0kΩ

25.3kΩ

21.7kΩ

18.9kΩ

16.7kΩ

14.9kΩ

13.3kΩ

12.1kΩ

11.0kΩ

10.0kΩ

9.2kΩ

(3.5)kΩ

1.95

2.0

(5.8)kΩ

(8.5)kΩ

2.05

2.1

(11.8)kΩ

(16.0)kΩ

(21.4)kΩ

(28.5)kΩ

(38.5)kΩ

(53.5)kΩ

(78.5)kΩ

(129.0)kΩ

(279.0)kΩ

2.15

2.2

2.25

2.3

(3.4)kΩ

(4.8)kΩ

2.35

2.4

(6.5)kΩ

2.45

2.5

(8.3)kΩ

(10.3)kΩ

(12.6)kΩ

(15.2)kΩ

(18.2)kΩ

(21.8)kΩ See Note 3

(26.0)kΩ

(31.0)kΩ

(37.1)kΩ

(44.8)kΩ

(54.6)kΩ

(67.8)kΩ

(86.2)kΩ

(114.0)kΩ

(160.0)kΩ

(252.0)kΩ

(528.0)kΩ

2.55

2.6

189.0kΩ

88.5kΩ

55.2kΩ

38.5kΩ

28.5kΩ

21.8kΩ

17.1kΩ

13.5kΩ

10.7kΩ

8.5kΩ

2.65

2.7

8.4kΩ

7.8kΩ

2.75

2.8

7.2kΩ

6.7kΩ

2.85

2.9

6.2kΩ

5.8kΩ

2.95

3.0

5.4kΩ

5.0kΩ

3.05

3.1

3.15

3.2

3.25

3.3

3.4

111.0kΩ See Note 5

49.6kΩ

3.5

3.6

29.0kΩ

R1/R3 = (Blue)

R2/R4 = Black

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

Application Notes

PT6920/PT6930 Series

Figure 1

Using the Standby Function on the PT6920 and

PT6930 Dual Output Voltage Converters

V₂(sns)

Both output voltages of the 23-pin PT6920/6930 dual

output converter may be disabled using the regulator’s

standby function. This function may be used in applications

that require power-up/shutdown sequencing, or wherever

there is a requirement to control the output voltage On/

Off status with external circuitry.

V₁(sns)

V2_out

V₂out

V₁out

4,5,6

Vin

V_in

PT6921

V1_out

GND

Vo₂(adj) V0₁(adj)

23 16

STBY

- 11

C₁

C₂

C₃

The standby function is provided by the STBY* control

(pin 3). If pin 3 is left open-circuit the regulator operates

normally, and provides a regulated output at both Vo₁

(pins 12–15) and Vo₂(pins 18–21) whenever a valid supply

voltage is applied to V_in(pins 4, 5, & 6) with respect to

COM

BSS138

Inhibit

+5V V _in

GND (pins 7–11). If a low voltage is then applied to pin 3,

both regulator outputs will be simultaneously disabled and

the input current drawn by the ISR will typcially drop to

less than 30mA (50mA max). The standby control may also

be used to hold-off both regulator outputs during the pe-

riod that input power is applied.

Turn-On Time: Turning Q₁in Figure 1 off removes the low-

voltage signal at pin 3 and enables both outputs from the

PT6920/6930 regulator. Following a delay of about 10–20ms,

Vo₁and Vo₂rise together until the lower voltage, Vo₂,

reaches its set output. Vo₁then continues to rise until both

outputs reach full regulation voltage. The total power-up

time is less than 25ms, and is relatively independant of load,

temperature, and output capacitance. Figure 2 shows wave-

forms of the output voltages Vo₁and Vo₂, for a PT6931

(3.3V/2.5V). The turn-off of Q₁corresponds to the rise in

V_stby. The waveforms were measured with a 5Vdc input

voltage, and with resistive loads of 5A and 2A at the Vo₁

and Vo₂outputs respectively.

The standby pin is ideally controlled using an open-collector

(or open-drain) discrete transistor (See Figure 1). It may

also be driven directly from a dedicated TTL compatible

gate. Table 1 provides details of the threshold requirements.

2,3

Table 1 Inhibit Control Thresholds

Parameter

Min

Max

Enable (V )

1.8V

Vin

Disable (V )

–0.1V

0.8V

Notes:

1. The Standby/Inhibit control logic is similar for all

Power Trends’ modules, but the flexibility and

threshold tolerances will be different. For specific

information on this function for other regulator

models, consult the applicable application note.

Figure 2

Vo1 (3.3V)

Vo2 (2.5V)

2. The Standby control pin is ideally controlled using an

open-collector (or open-drain) discrete transistor and

requires no external pull-up resistor. To disable the

regulator output, the control pin must be pulled to

less than 0.8Vdc with a low-level 0.5mA sink to

ground.

3. The Standby input on the PT6920/6930 series may

be driven by a differential output device, making it

directly compatible with TTL logic. The control

input has an internal pull-up to the input voltage V_in.

A voltage of 1.8V or greater ensures that the

Vstby

Ch1 1V/Div

Timebase: 5ms/Div

Ch2 1V/Div

Ch3 5V/Div

regulator is enabled. Do not use devices that can drive

the Standby control input above 5.5V or V_in.

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

Application Notes continued

PT6920/PT6930Series

Capacitor Recommendations for the Dual-Output

PT6920/30 Regulator Series

Tantalum Capacitors

Input Capacitors:

Tantalum type capacitors can be used for the output but only

the AVX TPS series, Sprague 593D/594/595 series or Kemet

T495/T510 series. The AVX TPS series, Kemet or Sprague

series tantalums are recommended over many other 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 a less reliable when compared to the AVX

TPS series when determining power dissipation capability.

Tantalum types are recommended for applications where

ambient temperatures fall below 0°C.

The recommended input capacitance is determined by 1.0

ampere minimum ripple current rating and 330µF minimum

capacitance (300µF for Oscon® or low ESR tantalum).

Ripple current and <100mΩ equivalent series resistance

(ESR) values are the major considerations, along with tem-

perature, when designing with different types of capacitors.

Tantalum capacitors have a recommended minimum voltage

rating of 2 × the maximum DC voltage + AC ripple. This is

necessary to insure reliability for input voltage bus applica-

tions.

Output Capacitors: C₂(Required), C₃(Optional)

The ESR of the required capacitor (C₂) must not be greater

than 150mΩ. Electrolytic capacitors have poor ripple per-

formance at frequencies greater than 400kHz but excellent

low frequency transient response. Above the ripple fre-

quency, 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 1. The optional 100µF capacitor (C₃) for Vo₂can

have an ESR of up to 200mΩ for optimum performance

and ripple reduction. (Note: Vendor part numbers for the

optional capacitor, C₃, are not identified in the table. Use the

same series selected for C₂)

Capacitor Table

Table 1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

(rms) ratings. The number of capacitors required at both the

input and output buses is identified for each capacitor type.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those listed

are for guidance. The RMS ripple current rating and ESR

(Equivalent Series Resistance at 100kHz) are critical parameters

necessary to insure both optimum regulator performance and

long capacitor life.

Table 1: Input/Output Capacitors

Capacitor

Vendor/

Capacitor Characteristics

Quantity

Component

Series

Working

Voltage

85°C Maximum

Ripple

Current(Irms)

(ESR) Equivalent

Series Resistance

Physical

Size(mm)

Input

Bus

Output

Bus

Value(µF)

Vendor Number

Panasonic

25V

35V

560µF

390µF

330µF

0.0065W

0.065W

0.117W

1205mA

555mA

12.5x15

8x11.5

(a)

EEUFC1E561S

EEUFC1V391S

EEUFC1C331

United

Chemi -con

LXV/FS/

LXZ

16V

35V

10V

20V

330µF

470µF

330µF

150µF

0.120W

0.052W

0.025W

0.030/2W

555mA

1220mA

3500mA

3200mA

8x12

(a)

LXZ16VB331M8X12LL

LXZ35VB471M10X20LL

10FS330M

10x20

10x10.5

(N/R)

20FS150M

Nichicon

35V

50V

560µF

330µF

470µF

0.048W

0.065/2W

0.046W

1360mA

1020mA

1470mA

16x15

12.5x15

18x15

UPL1V561MHH6

UPL1V331MHH6

UPM1H4711MHH6

Panasonic

Surface Mtg

10V

35V

16V

1000µF

330µF

0.043W

0.065W

0.150W

1205mA

670mA

12x16.5

12.5x16

10x10.2

(a)

EEVFC1A102LQ

EEVFC1V331LQ

EEVFC1C331P

10V

20V

330µF

150µF

0.025W

0.024/2W

>3500mA

>3800mA

3600mA

10.0x10.5

10.3x10.3

(N/R)

10SS330M

10SV300M

Oscon- SS

20SV150M

SV= Surface Mount

AVX

Tantalum

TPS

10V

330µF

220µF

0.100/2W

0.095W

>2500mA

>3000mA

>2000mA

7.3Lx

4.3Wx

4.1H

TPSV337M010R0100

TPSV337M010R0060

TPSV227M0105R0100

Kemet

T510

T495

10V

330µF

220µF

0.033W

0.070W/2=0.035W

1400mA

>2000mA

7.3Lx5.7W

x 4.0H

T510X337M010AS

T495X227M010AS

7.3Lx

6.0Wx

4.1H

Sprague

594D

10V

330µF

220µF

0.0450W

0.065W

2350mA

>2000mA

4D337X0010R2T

594D227X0010D2T

(a) -Not recommended. The maximum ripple current rating of these capacitors does not meet the operating limits.

(N/R) -Oscon Type Capcitors are not recommended for this application due to extremely low equivatlent series resistance (ESR)

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

IMPORTANT NOTICE

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any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its products to the specifications applicable at the time of sale in accordance with

TI’sstandardwarranty. TestingandotherqualitycontroltechniquesareutilizedtotheextentTIdeemsnecessary

to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except

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