PT5544_技术文档

PT5540 Series

12-W 5-V Input Step-Up (Boost)

Integrated Switching Regulator

SLTS175 FEBRUARY 2003

Features

• Input Voltage: 5V

• 84% Efficiency

• Small Footprint: 0.94in × 0.35in

Vertical package)

(

• Industrial Temperature Range:

–40°C to +85°C

• Under-Voltage Lockout

• Soft Start

• Solderable Copper Case

• Surface Mountable

• IPC Lead Free 2

Description

Ordering Information

PT5541r = +12Volts

PT5542r = +15 Volts

PT5544r = + 8 Volts

PT5545r = + 9 Volts

PT5546r = +10 Volts

PT5548r = +12.6 Volts

Pin-Out Information

Pin Function

The PT5540 Excalibur™ power modules

are a series of integrated switching regulators

(ISRs) that provide a boost-voltage function.

They are designed for use with +5V bus

systems that require an additional higher

voltage rail.

1

Vin

2GND

3

V_o

The modules are rated 12W and produce

a fixed output voltage over the full industrial

temperature range of -40°C to +85°C. The

series includes the common output voltages,

+12V and +15V. Applications include PCI

cards, audio circuits, and battery operated

instruments.

The PT5540 series is packaged in a 3-pin

thermally efficient copper case. The case is

solderable, has a small footprint, and can

accommodate both through-hole and surface

mount pin configurations.

PT Series Suffix

(PT1234x)

Case/Pin

Order

Package

Configuration

Suffix

Code

Vertical

Horizontal

SMD

N

A

C

(EFN)

(EFP)

(EFQ)

(Reference the applicable package code draw-

ing for the dimensions and PC board layout)

The PT5540 series is offered as a next

generation replacement to the popular PT5040

series. The PT5540 has a lower operating

temperature range and improved start-up

characteristics.

Standard Application

+V_IN

+V_O

3

1

PT5540

+

2

C_IN

C_OUT

100µF

COM

C_IN= Required 100µF electrolytic

C_OUT= Required 100µF electrolytic

(not to exceed 560µF)

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

PT5540 Series

12-W 5-V Input Step-Up (Boost)

Integrated Switching Regulator

SLTS175 FEBRUARY 2003

Specifications (Unless otherwise stated, T_a=25°C, V_in=5V, C_in=100µF, C_out=100µF, and I_o=I_omax)

PT5540 SERIES

Typ

Characteristics

Symbols

Conditions

Min

Max

Units

A

Output Current

I_o

Over V_inrange

PT5541/8

PT55420.1

PT5544

0.1 ⁽¹⁾

—

1

—

0.75

0.1

—

1.75

1.5

PT5545

PT5546

1.3

Input Voltage Range

V_in

Over I_orange

V_o>10V

V_o≤10V

4.5

9

V

—

(V_o–1)

Set-Point Voltage Tolerance

Temperature Variation

Line Regulation

Load Regulation

Total Output Variation

V_o

tol

—

2%V_o

%V_o

∆Reg_temp

∆Reg_line

∆Reg_load

∆Reg_tot

–40°C <T_a< +85°C, I_o=I_omin

Over V_inrange

Over I_orange

Includes set-point, line, load,

–40°C ≤ T_a≤ +85°C

—

0.5

—

0.5

—

3

—

%V_o

Efficiency

η

I_o=75% of I_omax

PT5541/8

PT5542—

PT5544

84

—

86

—

%

PT5545

PT5546

V_oRipple (pk-pk)

V_r

20MHz bandwidth

—

2

5

%V_o

Transient Response

t_tr

1A/µs load step, 50% of I_omax

V_oover/undershoot

—

150

1

—

3

µSec

∆V_tr

%V_o

Under-Voltage Lockout

UVLO

V_inincreasing

Hysterisis

—

0.1

4.3

0.2—

—

V

Start-up Current

Switching Frequency

External Capacitance

I_instart

ƒ_o

On start up, Cout =560uF

Over V_inand I_oranges

—

300

100

I_in+ 0.5

350

—

400

A

kHz

(3)

C_in

—

µF

C_out

560

(4)

(5)

Operating Temperature Range

Storage Temperature

Mechanical Shock

T

s

Over V_inrange

—

Per Mil-STD-883D, Method 2002.3 , 1 msec,

Half Sine, mounted to a fixture

–40

-40

—

500

+85

°C

G’s

a

+125

—

Mechanical Vibration

Per Mil-STD-883D, Method 2007.2,

20-2000 Hz, Soldered in a PC board

—

(6)

—

20

—

G’s

grams

Weight

Flammability

—

6.5

Materials meet UL 94V-0

Notes: (1) The ISR will operate down to no load with reduced specifications.

(2) Boost topology ISRs are not short circuit protected.

(3) The PT5540 Series requires a 100µF electrolytic or tantalum capacitor at both the input and output for proper operation in all applications.

(4) For operation below 0°C, the output capacitor C₂must have stable characteristics. Use either a low ESR tantalum or Oscon® capacitor.

(5) See SOA curves or consult factory for the appropriate derating.

(6) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.

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

Typical Characteristics

PT5540 Series

12-W 5-V Input Step-Up (Boost)

Integrated Switching Regulator

SLTS175 FEBRUARY 2003

PT5545, 9VDC (See Note A)

PT5541, 12VDC (See Note A)

PT5542, 15VDC (See Note A)

Efficiency vs Output Current

100

90

80

70

60

50

100

90

80

70

60

50

100

90

80

70

60

50

V_IN

8.0V

7.0V

6.0V

5.0V

V_IN

9.0V

7.0V

5.0V

9.0V

8.0V

7.0V

6.0V

5.0V

0

0.3

0.6

0.9

1.2

1.5

0

0.2

0.4

0.6

0.8

1

0

0.15

0.3

0.45

0.6

0.75

Iout (A)

Ripple vs Output Current

300

250

200

150

100

50

240

200

160

120

80

250

200

150

100

50

V_IN

5.0V

6.0V

7.0V

8.0V

9.0V

V_IN

5.0V

6.0V

7.0V

8.0V

9.0V

5.0V

6.0V

7.0V

8.0V

40

0

0.2

0.4

0.6

0.8

1

0

0.15

0.3

0.45

0.6

0.75

0

0.3

0.6

0.9

1.2

1.5

Iout (A)

Power Dissipation vs Output Current

2.5

2

2.5

2

2.5

2

V_IN

5.0V

6.0V

7.0V

8.0V

9.0V

5.0V

6.0V

7.0V

8.0V

9.0V

5.0V

6.0V

7.0V

8.0V

1.5

1

1.5

1

1.5

1

0.5

0

0.5

0

0.5

0

0.2

0.4

0.6

0.8

1

0

0.15

0.3

0.45

0.6

0.75

0

0.3

0.6

0.9

1.2

1.5

Iout (A)

Safe Operating Area; V_in=5V (See Note B) Safe Operating Area; V_in=5V (See Note B) Safe Operating Area; V_in=5V (See Note B)

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

Airflow

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

Nat Conv

0

0.15

0.3

0.45

0.6

0.75

0

0.3

0.6

0.9

1.2

1.5

0

0.2

0.4

0.6

0.8

1

Iout (A)

Note A: Characteristic data 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 manufacturer’s maximum rated operating temperatures.

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

Application Notes

PT5540 Series

Tantalum Capacitors (Optional Input Capacitors)

Capacitor Recommendations for the

Tantalum type capacitors can be used for the input bus

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. Do not use tantalum capaci-

tors on the output bus.

PT5540 Boost Regulator Regulator Series

Input Capacitors:

The minimum input capacitance required is 100µF, with

a 200-mA(rms) ripple current rating and 150mΩ typical

equivalent series resistance (ESR). Electrolytic capacitors

have marginal ripple performance at frequencies greater

than 400kHz but have 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 ESR type capacitor

part numbers are identified in Table 2-1.

Capacitor Table

Output Capacitor:

Table 1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

ratings. The number of capacitors required at both the

input and output buses is identified for each capacitor type.

The recommended output capacitance is determined by

0.5-A(rms) ripple current rating and 100µF minimum

capacitance. The maximum output capacitance is 560µF.

Ripple current and >50mΩ ESR value are the major

considerations, along with temperature, 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 applications.

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/

Series

Capacitor Characteristics

Quantity

Working

Voltage

Value(µF)

(ESR) Equivalent

Series Resistance

105°C Maximum

Ripple

Physical

Size(mm)

Input

Bus

Output

Bus

Vendor Part Number

Current(Irms)

Panasonic

FC (Radial)

(Surface Mtg)..............

35V

25V

35V

100

330

100

0.117Ω

0.090Ω

0.150Ω

555mA

755mA

670mA

8x11.5

10×12.5

10x10.2

1

EEUFC1V101

EEUFC1E331

EEVFC1V101P

FC/FK (Surface Mtg)

35V

100

0160Ω

600mA

8x10.2

1

EEVFK1V101P

United Chemi-con

LXZ/LXV Series

MVY (Surface Mtg)

35V

25V

150

220

330

0.120Ω

0.150Ω

555mA

670mA

8x12

10×10.3

1

LXZ35VB151M8X12LL

LXZ25VB221M8X12LL

MVY25VC331M10X10TP

Nichicon

PM Series

35V

25V

120

180

0.150Ω

555mA

10x12.5

1

UPM1V121MPH6

UPM1E181MPH6

NX

16V

150

0.026Ω

3300mA

10x8

1

N/R ⁽¹⁾PNX1C151MCR1GS

Os-con:

N/R ⁽¹⁾20SP120M(No Vout)

N/R ⁽¹⁾20SVP100M (No Vout)

SP

20V

120

100

0.024Ω

3100mA

3320mA

8x10.5

8x12

1

SVP (surface Mount)

AVX Tantalum

TPS (Surface Mtgt)

16V

20V

100

0.125Ω

0.200Ω

>1149mA

>1118mA

7.3L

×5.7W

×4.1H

1

N/R ⁽¹⁾TPSE107M016R0125(No Vout)

N/R ⁽¹⁾TPSV107M016R0200 (No Vout)

Kemet Tantalum

T520/T495 Series

(Surface Mount)

10V

100

0.080Ω

0.100Ω

1700mA

>100mA

4.3W

×7.3L

×4.0H

1

N/R ⁽¹⁾T520D107M010AS(No Vout)

N/R ⁽¹⁾T495X107M010AS(No Vout)

Sprague Tantalum

594D Series

(Surface Mount)

16V

100

0.075Ω

1410mA

7.2L

×6W

×4.1H

1

N/R ⁽¹⁾594D107X0016D2T

(1) N/R –Not recommended. The surge and normal voltage rating does not meet the minimum operating limits.

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

Application Notes

PT5540 Series

Features and System Considerations for the

PT5540 Series of Boost ISRs

Boost Regulator Topology and Characteristics

Soft-Start Power Up

Figure 1-1 shows a block diagram of the boost regulator

circuit, which is representative of the PT5540 ISR series.

Note that when the MOSFET switch is off, the output

regulator is connected directly to the input via an inductor

and schottky diode. Thus with the MOSFET switch inac-

tive, the output voltage merely tracks the input voltage,

less the forward voltage drop of the diode.

When the input source voltage rises above the UVLO

threshold voltage the regulator will initiate a soft-start

power up. The soft-start circuitry introduces a short

time delay and slows the rate at which the output rises

to full regulation voltage. Figure 1-2 shows the power-up

characteristic of a PT5542 (15V) regulator. After the

application of the input voltage, V_in, there is a delay of

approximately 100ms before the output voltage rises

above the input voltage. This delay provides more time

for a slow rising input source to reach the minimum

operating voltage of 4.5V. The waveforms of Figure 1-2

were measured with a 5Vdc input voltage and 0.5-Adc

constant current load.

Figure 1-1; Boost Regulator Block Diagram

Inductor

Schottky Diode

V_IN

V_OUT

Fiigure 1-2; Typical Power Up Waveforms for the PT5542

Output

Capacitor

MOSFET

Switch

Vo (5V/Div)

PWM

Control

Vin (5V/Div)

Iin (1A/Div)

COM

One of the characteristic of a boost regulator is that its

input current is always higher than its output current.

For example, a 12-W rated 5V to 12V boost regulator,

operating at 80% efficiency, will demand 15W of input

power. Thus a 1-A load on the regulator’s output will

correlate to 3-A of input current from its source. And

any fall (droop) in the input voltage will corrspondingly

result in the input current rising further. The input current

demanded by a boost regulator is therefore high, making it

important that the regulator be connected to a low imped-

ance source.

HORIZ SCALE: 40ms/Div

Input Source Requirements

As the input current is much higher than the output load

current, boost regulators are sensitive to source voltage

impedance. This is especially during power up when a

regulator attempts to start at too low an input voltage.

The UVLO built into the PT5540 series reduces the input

current during startup by disabling the boost function until

the source voltage has almost reached the minimum oper-

ating voltage of 4.5V. However, the UVLO circuitry will

also promptly switch off the regulator if this voltage sags

as the input current rises. This is often described as a

“hiccup” effect. The module may hiccup at power up due

to a combination of two conditions. The input voltage is

rising too slowly and its source impedance is not low

enough. To ensure a clean power-up the output impedance

of the input source should be less than 25mΩ. A higher

input impedance can be tolerated if the input voltage

rises promptly and regulates closer to the nominal input

voltage of 5V.

Under-Voltage Lockout (UVLO)

The PT5540 series of boost regulators incorporate an

input under-voltage lockout (UVLO). The UVLO pre-

vents operation of the regulator until the input voltage is

above the UVLO threshold (see data sheet specifications).

This prevents the regulator from drawing a high startup

current during power up, and minimizes the current drain

from the input source during low input voltage conditions.

Note: Below the UVLO threshold, the regulator’s internal

MOSFET is merely held ‘off’, disabling its boost function.

Under this condition the regulator will still produce an output

voltage. This is the input voltage less the forward voltage drop

of the internal schottky diode.

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

Application Notes continued

PT5540 Series

Fault Protection

Unlike a “Buck” or step-down regulator it is not possible

to provide a boost regulator with short-circuit protection.

As revealed in the block diagram of Figure 1-1, inhibiting

the MOSFET switching action only disables the regulator’s

boost function. Therefore under a severe output impedance

fault the control circuit cannot disconnect the output from

the input source.

To prevent an output over-current or short-circuit fault

from propagating to the input bus, a fuse or equivalent

over-current protection is recommended at the input of

the module. Whatever form of protection is selected, it is

important to note that the impedance and/or voltage drop

of the series element will add to the regulator’s minimum

input voltage requirements. Power up may also be affected.

The combination of an input surge current with an im-

pedance in series with the regulator input may cause the

input voltage to momentarily dip back below the UVLO

threshold. Ensure that the fuse rating or input current

limit threshold are designed with a generous margin.

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

PACKAGE OPTION ADDENDUM

www.ti.com

26-Jul-2005

PACKAGING INFORMATION

Orderable Device

PT5541A

Status ⁽¹⁾

ACTIVE

NRND

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

SIP MOD

ULE

EFP

3

30

TBD

Call TI

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

PT5541C

SIP MOD

ULE

EFQ

EFN

EFQ

EFP

EFQ

EFN

PT5541N

SIP MOD

ULE

PT5542C

SIP MOD

ULE

PT5544A

SIP MOD

ULE

PT5544C

ACTIVE

NRND

SIP MOD

ULE

PT5545N

SIP MOD

ULE

⁽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) 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.

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.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 1

IMPORTANT NOTICE

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型号：	PT5544
厂家：	TEXAS INSTRUMENTS
描述：	Under-Voltage Lockout
文件：	总8页 (文件大小：195K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PT5544 [TI]

相关型号：

PT5544A

PT5544C

PT5544N

PT5545

PT5545A

PT5545C

PT5545N

PT5546

PT5546A

PT5546C

PT5546N

PT5548