TC575302ECTTR - Microchip Technology

TC57 Series

TC57-2 1/25/00

FEATURES

■Low Dropout Voltage:

100 mV @ 650 mA with FZT749 PNP Transistor

■Output Voltage: 2V to 6V in 0.1V Increments

■2.7V to 8V Supply Range

■Low Operating Current: ...........................................

50 µAOperating; 0.2 µA Shutdown

■Low-True Chip Enable

■Output Accuracy < ±2%

■Small Package: 5-Pin SOT-23A

TYPICAL APPLICATIONS

■Battery Operated Systems

■Portable Instruments

■High-Efficiency Linear Regulator

■Post-Regulator for SMPS

■Power Supply or Battery Back-Up Supply for

Memory

GENERAL DESCRIPTION

The TC57 is a low dropout regulator controller that

operates with an external PNP pass transistor, allowing the

user to tailor the LDO characteristics to suit the application

at hand. This results in lower dropout operation (and often

lower cost) compared with traditional linear regulators with

on-board pass transistors. The maximum output current of

a TC57-based regulator circuit is limited only by the charac-

teristics of the external pass transistor. For example, a

maximum output current of 650 mA (with a dropout voltage

of 100 mV) results when an FZT749 pass transistor is used,

while a Darlington configuration can deliver up to 4A.

Flexibility, and superior performance make this family of

regulator controllers the ideal choice in applications where

low dropout voltage and low installed cost are key.

TYPICAL APPLICATION

PIN CONFIGURATION

Output Voltage:

Ex: 30 = 3.0V

Tolerance:

2 = ±2%

Temperature/Package:

E: –40°C to +85°C

CT: 5-Pin SOT-23A

Taping Direction:

TR: Standard Taping

RT: Reverse Taping

PART CODE TC57 XX 02 ECT XX

ORDERING INFORMATION

SHDN

VOUT

GND

TC57

123

EXT

VIN

*5-Pin SOT-23A

TC573002ECT

OUT

GND

SHDN

EXT

10 µF

(Tantalum)

FZT749

10 µF

(Tantalum)

+3.3V

47K

OFF

OUT

+3V

3.3V Line Input, 3.0V, 500 mA Output LDO

Note: * 5-Pin SOT-23A is equivalent to the EIAJ SC-74A

Linear Regulator Controller

TC57 Series

ABSOLUTE MAXIMUM RATINGS*

Voltage on VIN and EXT Pins................................... +12V

Voltage on VOUT and SHDN Pins.....–0.3V to (VIN + 0.3V)

EXT Pin Current ......................................................50 mA

Operating Temperature Range (TC)........– 40°C to +85°C

Storage Temperature (TSTG).................– 40°C to +150°C

Power Dissipation ................................................150 mW

ELECTRICAL CHARACTERISTICS TC57EP3002 (NOTE 2): (SHDN = GND, VIN = VOUT + 1V, VOUT = 3V

to 5V, IOUT = 0, TA = 25°C, Test Circuit of Figure 1, unless otherwise noted.)

Symbol Parameter Test Conditions Min Typ Max Unit

VIN Input Voltage — — 8 V

VEXT Voltage on EXT Output — — 8 V

VOUT Output Voltage IOUT = 50 mA (Note 1) 0.98 x VRVR ± 0.5% 1.02 x VRV

∆VOUT Load Regulation 1 mA ≤ IOUT ≤ 100 mA (Note 3) –60 — 60 mV

VIN – VOUT Dropout Voltage (Note 2) IOUT = 100 mA — 100 — mV

IDD Supply Current VSHDN = VIN = 5V — 50 80 µA

ISHDN Shutdown Supply Current VSHDN = GND — — 0.6 µA

∆VOUT/∆VIN Line Regulation IOUT = 50 mA, 4V ≤ VIN ≤ 8V (Note 3) — 0.1 0.3 %/V

∆VOUT/∆TV

OUT Temp. Coefficient IOUT = 10 mA, –40°C < TJ < +85°C— ±100 — ppm/°C

(Note 3)

ILEXT EXT Pin Leakage Current — — 0.5 µA

IEXT EXT Sink Current (Note 4) — — 25 mA

VIH SHDN Input High Logic Threshold 1.5 — — V

VIL SHDN Input Low Logic Threshold — — 0.25 V

IIH SHDN Input Current @ VIH VSHDN = VIN = 5V — — 0.1 µA

IIL SHDN Input Current @ VIL VSHDN = GND –0.2 –0.05 0 µA

NOTES: 1. VR is the regulator output voltage setting.

2. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured

at a 1V differential.

3. Varies with type of pass transistor used. Numbers shown are for the test circuit of Figure 1.

4. The product of IEXT x VEXT must be less than the maximum allowable power dissipation.

*Static-sensitive device. Unused devices must be stored in conductive

material. Protect devices from static discharge and static fields. Stresses

above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. These are stress ratings only and functional

operation of the device at these or any other conditions above those

indicated in the operational sections of the specifications is not implied.

Exposure to Absolute Maximum Rating Conditions for extended periods

may affect device reliability.

TC57 Series

TC57-2 1/25/00

Linear Regulator Controller

TC57XX02ECT

OUT

GND

SHDN

EXT

10 µF

(Tantalum)

FZT749

680Ω

10 µF

(Tantalum)

33K

OFF

OUT

Figure 1. Test Circuit

PIN DESCRIPTION

Pin Number Name Description

1 GND Ground Terminal.

IN Supply Voltage Input. Positive input voltage of 2.7V to 8.0V.

OUT Regulator Voltage Sense Input. Connects to the collector of the external PNP pass transistor.

4 EXT Base Drive for the external PNP pass transistor.

5 SHDN Shutdown Input. The device is enabled when SHDN ≤ VIL. The device enters a low power

shutdown state when SHDN ≥ VIH. During shutdown, the output is disabled, and supply

current falls to less than 1 µA.

Linear Regulator Controller

TC57 Series

DETAILED DESCRIPTION

The TC57 series of precision low dropout regulator

controllers use an external PNP transistor to accommodate

a wide range of output currents. A series resistor (RB) limits

the maximum base current drawn from the PNP transistor.

Limiting the base drive both determines the regulator’s

output current capability, as well as limits ground current

when the device is operated in dropout. The PNP transistor’s

VCE(SAT) is the only factor limiting dropout voltage.

Transistor Selection

The PNP pass transistor must have satisfactory power

dissipation, current gain, and collector current specifications

to suit the application at hand. The maximum output current

the circuit can deliver is influenced by hFE. The highest

guaranteed output current is given by:

ILOAD(MAX) = 25 mA x hFE(MIN)

The transistor’s actual power dissipation (PD) is equal to

the maximum load current times the maximum input/output

voltage differential, or:

PD = ILOAD(MAX) x (VIN(MAX) –VOUT(min))

The ideal transistor has a minimum hFE of 100, and a

VCE(SAT) of less than 0.6V at full output current. For example,

the Zetex FZT749 has an hFE of 170 at a collector current of

1A, and a guaranteed VCE(SAT) of 0.3V at a base current of

100 mA. It is packaged in a SOT223 and is recommended

for use with the TC57. Other transistors are also suitable,

depending on the required input and output voltages and

output current (Table 2a).

Base-Current Limiting Resistor (Figure 2)

Base current limiting resistor RB can be estimated using:

where: hFE is the current gain of the pass transistor

VIN is the input voltage (in volts)

VBE is the base-emitter voltage at the desired output

current (in volts)

IOUT is the output current (in Amps)

For example, assume a desired continuous output cur-

rent of 1.0A, an input voltage of 5V, and an FZT749 pass

transistor. The FZT749 has a typical hFE of 170, and a VBE

of 0.8V; both specified at a collector current of 1.0A. Substi-

tuting these values into the equation above results in an RB

value of 704Ω (closest standard value = 680Ω).

Pull-Up Resistor and Output Capacitor (Figure 2)

A pull-up resistor (RBE, installed between the base and

emitter of the pass transistor) facilitates rapid turn-off of the

pass transistor in the event of a sudden decrease in load.

Recommended values for this resistor are between 20 KΩ

and 47 KΩ. A Tantalum output capacitor of at least 10 µF

must be used to guarantee stability. Higher values decrease

output noise and eliminate power-on overshoot, but extend

power-up times. Table 2a lists several capacitor choices.

Input Capacitor (Figure 2)

The addition of an input capacitor further reduces output

noise, and negates the effects of power supply input imped-

ance. A 10 µF(min) Tantalum capacitor is recommended.

Shutdown Mode

The TC57 enters a low power shutdown mode when the

shutdown input (SHDN) is high. During shutdown, the regu-

lator is disabled, the output capacitor is discharged through

the load, and supply current to the TC57 decreases to less

than 1µA. Normal operation resumes when SHDN is brought

low. If the shutdown mode is not used, SHDN should be tied

to VIN.

RB = hFE(VIN – VBE)

IOUT

Equation 1.

Equation 2.

Equation 3.

Figure 2. 3.3V, 1A Regulator Using 5V Supply Input

TC57

OUT

GND

SHDN

EXT

10 µF

(Tantalum)

FZT749

680Ω

OUT

10 µF

(Tantalum)

= 5V

33KΩ

OFF

OUT

= 3.3V

TC57 Series

TC57-2 1/25/00

Linear Regulator Controller

Table 2a. Component Suppliers

Device Manufacturer Product

Method

CAPACITORS

267 Series Matsuo Surface Mount

F95 Tantalum Series Nichicon Surface Mount

595 Tantalum Series Sprague Surface Mount

OS-CON Series Sanyo Through-Hole

Low-ESR Organic

Semiconductor

LXF Series United Chemi-Con Through-Hole

BIPOLAR TRANSISTORS

ZTX749 Zetex Through-Hole

T1P42 Motorola Through-Hole

2N4403 Motorola Through-Hole

2N2907A Motorola Through-Hole

CMPT2907A Central Semiconductor Surface Mount

PZT2907AT1 Motorola Surface Mount

FZT749 Zetex Surface Mount

Table 2b. Manufacturers’ Phone and Fax Numbers

Manufacturer Country Telephone Fax

Central

Semiconductor USA (516) 435-1110 (516) 435-1824

Matsuo USA (714) 969-2491 (714) 960-6492

Motorola USA (602) 244-3370 (602) 244-4015

Nichicon USA (847) 843-7500 (847) 843-2798

Japan 81-7-5231-8461 81-7-5256-4158

Sanyo USA (619) 661-6835 (619) 661-1055

Japan 81-7-2070-6306 81-7-2070-1174

Sprague USA (603) 224-1961 (603) 224-1430

United

Chemi-Con USA (714) 255-9500 (714) 255-9400

Zetex USA (516) 543-7100 (516) 864-7630

UK 44-61-627-5105 44-61-627-5467

 represents integer part of output voltage

Symbol Voltage

22.

33.

44.

55.

66.

 represents 1st decimal of output voltage

Symbol Voltage Symbol Voltage

0.05 .5

1.16 .6

2.27 .7

3.38 .8

4.49 .9

represents production lot ID code

MARKINGS

5-PIN SOT-23A

Linear Regulator Controller

TC57 Series

5.1

5.0

4.8

4.7 0 100 200 300 400 500

4.9

TC575002(5V)

TA = 25°C

VIN = 6V, CL =10µF (Tantalum) TA = 25°C

VIN = 4.3V, CL =10µF (Tantalum)

TA = 25°C

VIN = 5V, CL =10µF (Tantalum)

1. OUTPUT VOLTAGE vs. OUTPUT CURRENT

2. OUTPUT VOLTAGE vs. INPUT VOLTAGE

OUTPUT VOLTAGE:VOUT(V)

4.1

4.0

3.8

3.7 0 100 200 300 400 500 OUTPUT CURRENT:I

OUT

(mA)OUTPUT CURRENT:I

OUT

(mA) OUTPUT CURRENT:I

OUT

(mA)

3.9

TC574002(4V)

4.2

4.0

3.6

3.4

4.0 4.5

3.23.5 INPUT VOLTAGE :V

(V)

INPUT VOLTAGE V

(V)

3.8

CL =10µF (Tantalum),TA = 25°C

OUTPUT VOLTAGE:VOUT(V)

4.10

4.05

3.95

3.90

3.85 4567

4.00

TC574002(4V)

5.2

5.0

4.6

4.4

5.0 5.5

4.24.5 INPUT VOLTAGE :V

(V)

4.8

CL =10µF (Tantalum),TA = 25°C

OUTPUT VOLTAGE:VOUT(V)

TC575002(5V)

3.5

3.3

2.9

2.7

3.3 3.8

2.52.8 INPUT VOLTAGE V

(V)

3.1

CL =10µF (Tantalum),TA = 25°C

OUTPUT VOLTAGE:VOUT(V)

TC573302(3.3V)

INPUT VOLTAGE :V

(V)

CL =10µF (Tantalum),TA = 25°C

OUTPUT VOLTAGE:VOUT(V)

5.10

5.05

4.95

4.90

4.85 567

5.00

TC575002(5V)

INPUT VOLTAGE V

(V)

CL =10µF (Tantalum),TA = 25°C

OUTPUT VOLTAGE:VOUT(V)

3.40

3.35

3.25

3.20

3.15 345

3.30

TC573302(3.3V)

3.4

3.3

3.1

3.0 0 100 200 300 400 500

3.2

TC573302(3.3V)

OUT

=1mA

100mA

500mA

100mA

500mA

100mA, 500mA

OUT

=1mA, 100mA

OUT

=1mA

OUT

=1mA I

OUT

=1mA

500mA

OUT

=1mA

500mA

100mA

500mA

TYPICAL CHARACTERISTICS CURVES

TC57 Series

TC57-2 1/25/00

Linear Regulator Controller

0.8

1.0

0.6

0.2

0.0 0 200 400 600 800 1000

0.4

TC575002(5V)

CL =10µF (Tantalum) CL =10µF (Tantalum)

CL =10µF (Tantalum)

3. DROPOUT VOLTAGE vs. OUTPUT CURRENT

4. SUPPLY CURRENT vs. INPUT VOLTAGE

5. OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE

DROPOUT VOLTAGE:VIN -VOUT

0.8

1.0

0.6

0.2

0.0 0 200 400 600 800 1000 OUTPUT CURRENT:IOUT(mA)

OUTPUT CURRENT:IOUT(mA) OUTPUT CURRENT:IOUT(mA)

0.4

TC574002(4V)

465

INPUT VOLTAGE :VIN (V)

AMBIENT TEMP. TA(°C)

VIN = 6.0V

IOUT = 100mA,CL =10µF (Tantalum)

OUTPUT VOLTAGE:VOUT(V)

SUPPLY CURRENT IDD(µA)

5.10

5.05

4.95

4.90

-40 -20 020 40 60 80

5.00

TC575002(5V)

TC573302(3.3V)

678

INPUT VOLTAGE :VIN (V)

SUPPLY CURRENT IDD(µA)

TC575002(5V)

4.10

4.05

3.95

3.90 20 40 60 80

-40

-20 0

AMBIENT TEMP. TA(°C)

4.00

VIN = 5.0V

IOUT = 100mA,CL =10µF (Tantalum)

OUTPUT VOLTAGE:VOUT(V)

TC574002(4V)

INPUT VOLTAGE :VIN (V)

SUPPLY CURRENT IDD(µA)

0456

TC574002(4V)

AMBIENT TEMP. TA(°C)

VIN = 4.3V

IOUT = 100mA,CL =10µF (Tantalum)

OUTPUT VOLTAGE:VOUT(V)

3.40

3.35

3.25

3.20-40 -20 02040 60

3.30

TC573302(3.3V)

1.0

0.8

0.4

0.2

0.0 0 200 400 600 800 1000

0.6

TC573302(3.3V)

- 30°C- 30°C- 30°C

80°C80°C80°C

TOPR = 25°C

TOPR = 25°C, 80°C

TOPR = 25°C, 80°C TOPR = 25°C, 80°C

TOPR = 25°CTOPR = 25°C

- 30°C

- 30°C- 30°C

TYPICAL CHARACTERISTICS CURVES (CONT.)

Linear Regulator Controller

TC57 Series

-20-40

020406080

-20-40

020406080

-20-40

020406080

TC575002(5V)

VIN =4.3V

VIN =5V VIN =6V

6. SUPPLY CURRENT vs. AMBIENT TEMPERATURE

7. INPUT TRANSIENT RESPONSE

SUPPLY CURRENT I

(µA)

SUPPLY CURRENT I

(µA)

SUPPLY CURRENT I

(µA)

AMBIENT TEMP. TA(°C)

AMBIENT TEMP. TA(°C) AMBIENT TEMP. TA(°C)

TC574002(4V)

5.4

5.3

5.1

5.0

4.9

Time (0.4 msec/div)

5.2

INPUT VOLTAGE V

(V)

OUTPUT VOLTAGE V

OUT

(V)

TC575002(5V)

TC573302(3.3V)

IOUT = 10mA, CL=10µF(Tantalum)

INPUT VOLTAGE

OUTPUT VOLTAGE

5.4

5.3

5.1

5.0

4.9

Time (0.4 msec/div)

5.2

INPUT VOLTAGE V

(V)

OUTPUT VOLTAGE V

OUT

(V)

TC575002(5V)

IOUT = 100mA, CL=10µF(Tantalum)

INPUT VOLTAGE

OUTPUT VOLTAGE

4.4

4.3

4.1

4.0

3.9

Time (0.4 msec/div)

4.2

4.4

4.3

4.1

4.0

3.9

4.2

INPUT VOLTAGE V

(V)

OUTPUT VOLTAGE V

OUT

(V)

TC574002(4V)

IOUT = 10mA, CL=10µF(Tantalum)

INPUT VOLTAGE

OUTPUT VOLTAGE

Time (0.4 msec/div)

INPUT VOLTAGE V

(V)

OUTPUT VOLTAGE V

OUT

(V)

TC574002(4V)

IOUT = 100mA, CL=10µF(Tantalum)

INPUT VOLTAGE

OUTPUT VOLTAGE

TYPICAL CHARACTERISTICS CURVES (CONT.)

TC57 Series

TC57-2 1/25/00

Linear Regulator Controller

TYPICAL CHARACTERISTICS CURVES (CONT.)

7. INPUT TRANSIENT RESPONSE (CONT.)

8. LOAD TRANSIENT RESPONSE

1000

800

400

200

300mA

1mA 1mA

1mA

300mA

Time (10 msec/div)

600

OUTPUT VOLTAGE V

OUT

(V)

OUTPUT CURRENT I

OUT

(mA)

TC575002(5V)

1000

800

400

200

600

1000

800

400

200

600

IN =

6V, C

=10µF(Tantalum)

OUTPUTVOLTAGE

OUTPUT CURRENT

Time (10 msec/div)

4.10

4.05

3.95

3.90

3.85

4.00

5.10

5.05

4.95

4.90

4.85

5.00

3.40

3.35

3.25

3.20

3.15

3.30

OUTPUT VOLTAGE V

OUT

(V)

OUTPUT CURRENT I

OUT

(mA)

TC574002(4V)

IN =

5V, C

=10µF(Tantalum)

OUTPUT VOLTAGE

OUTPUT CURRENT

Time (10 msec/div)

OUTPUT VOLTAGE V

OUT

(V)

OUTPUT CURRENT I

OUT

(mA)

TC573302(3.3V)

IN =

4.3V, C

=10µF(Tantalum)

OUTPUTVOLTAGE

OUTPUT CURRENT

Time (0.4 msec/div)

3.7

3.6

3.4

3.3

3.2

3.5

3.7

3.6

3.4

3.3

3.2

3.5

INPUT VOLTAGE V

(V)

OUTPUT VOLTAGE V

OUT

(V)

TC573302(3.3V)

IOUT =

10mA, C

=10µF(Tantalum)

INPUT VOLTAGE

OUTPUT VOLTAGE

Time (0.4 msec/div)

INPUT VOLTAGE V

(V)

OUTPUT VOLTAGE V

OUT

(V)

TC573302(3.3V)

IOUT =

100mA, C

=10µF(Tantalum)

INPUT VOLTAGE

OUTPUT VOLTAGE

Linear Regulator Controller

TC57 Series

PACKAGE DIMENSIONS

Dimensions: inches (mm)

TAPING FORM

User Direction of Feed User Direction of Feed

Device

Marking

Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices

Device

Marking

PIN 1

Standard Reel Component Orientation

TR Suffix Device

(Mark Right Side Up)

Reverse Reel Component Orientation

RT Suffix Device

(Mark Upside Down)

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

5-Pin SOT-23A 8 mm 4 mm 3000 7 in

Carrier Tape, Number of Components Per Reel and Reel Size

5-Pin SOT-23A (EIAJ SC-74A)

.071 (1.80)

.059 (1.50)

.122 (3.10)

.098 (2.50)

.075 (1.90)

REF.

.020 (0.50)

.012 (0.30)

PIN 1 .037 (0.95)

REF.

.122 (3.10)

.106 (2.70)

.057 (1.45)

.035 (0.90)

.006 (0.15)

.000 (0.00) .024 (0.60)

.004 (0.10)

10° MAX. .010 (0.25)

.004 (0.09)

TC57 Series

TC57-2 1/25/00

Linear Regulator Controller

Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by

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Bangalore, 560 025, India

Tel: 91-80-2290061 Fax: 91-80-2290062

Japan

Microchip Technology Intl. Inc.

Benex S-1 6F

3-18-20, Shinyokohama

Kohoku -K u, Yok oha ma -shi

Kanaga wa, 222-0 033 , Japan

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea

Microchip Technology Korea

168-1, Youngbo Bldg. 3 Floor

Samsung-Dong, Kangnam-Ku

Seoul, Korea

Tel: 82-2-554-7200 Fax: 82-2-558-5934

ASIA/PACIFIC

(continued)

Singapore

Microchip Technology Singapore Pte Ltd.

200 Middle Ro ad

#07-02 Prime Centre

Singapore, 188980

Tel: 65-334-8870 Fax: 65-334- 8850

Taiwan

Microc hip Technology Taiwan

11F-3, No. 207

Tung Hua North Road

Taipei, 105, Taiwan

Tel: 886-2-2717-7175 Fax: 886-2-2545-0139

EUROPE

Australia

Microchip Technology Au stralia Pty Ltd

Suite 22, 41 Rawson Street

Epping 2121, NSW

Australia

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

Denmark

Microchip Technology Denmark ApS

Regus Business Centre

Lautrup hoj 1-3

Ballerup DK-2750 Denmark

Tel: 45 4420 9895 Fax: 45 4420 9910

France

Arizona Microchip Technology SARL

Parc díActivite du Moulin de Massy

43 Rue du Saule Trapu

Batiment A - ler Etage

91300 Massy, France

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany

Arizona Microchip Technology GmbH

Gustav-Heinemann Ring 125

D-81739 Munich, Germany

Tel: 49-89-627-144 0 Fax: 49-89-627-144-44

Germany

Analog Product Sales

Lochhamer Strasse 13

D-82152 Martinsried, Germany

Tel: 49-89-895650-0 Fax: 49-89-895650-22

Italy

Arizona Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

Milan, Italy

Tel: 39-039-65791-1 Fax: 39-039-6899883

United Kingdom

Arizona Microchip Technology Ltd.

505 Eskdale Road

Winnersh Triangle

Wokingham

Berksh ire, Engla nd RG41 5TU

Tel: 44 118 921 5869 Fax: 44-118 921-5820

01/09/01

WORLDWIDE SALES AND SERVICE