SEMTECH SC1563 Technical data

Quiescent 500mA Regulator

POWER MANAGEMENT

Description Features

SC1563

Very Low Dropout, Low

The SC1563 is a high performance positive voltage

regulator designed for use in applications requiring very

low dropout voltage at up to 500mA. Since it has supe-

rior dropout characteristics compared to regular LDOs, it

can be used to supply 2.5V on motherboards or 2.8V on

peripheral cards from the 3.3V supply with no heatsink.

Additionally, the SC1563 has a shutdown pin to further

reduce power dissipation while shut down. The SC1563

provides excellent regulation over variations in line, load

and temperature.

A wide range of fixed output voltage options are avail-

able. In addition, the output voltage of every device can

be adjusted between 1.2V and 4.8V using external resis-

tors. The SC1563 comes in the space saving 5-pin SOT-

23 package.

Typical Application Circuits

 350mV dropout @ 500mA
 Designed to operate with ceramic capacitors
 Adjustable output from 1.2V to 4.8V
 Multiple output voltage options (all parts also

adjustable externally using resistors)

 Over current and over temperature protection
 2µA quiescent current in shutdown
 No minimum load current requirement
 Low reverse leakage (output to input)
 Full industrial temperature range
 5-pin SOT-23 surface mount package. Also avail-

able in Lead-free, fully WEEE and RoHS compliant

Applications

 Personal Digital Assistants
 Battery powered systems
 Motherboards
 Peripheral cards
 PCMCIA cards

Internally Preset Output Voltage Externally Set Output Voltage

U1 SC1563IS-X.X

VIN VO (X.XV)

C1

1

SHDN

GND

2 3

SHDN

OUTIN

ADJ

45

C2

VIN

SHDN

C1

U1

SC1563IS-X.X

1

SHDN

GND ADJ

2 3

=

V

OUT

R2

45

OUTIN

R1

R2

+

R2)(R11.200

Volts

VO

C2

Revision: January 11, 2006

1 www.semtech.com

SC1563

POWER MANAGEMENT

Absolute Maximum Ratings

Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.

retemaraPlobmySmumixaMstinU

egatloVtupnIV

egatloVnwodtuhSV

noitapissiDrewoPP

gnitarepOtneibmAegnaRerutarepmeTT

gnitarepOnoitcnuJegnaRerutarepmeTT

egnaRerutarepmeTegarotST

gnitaRDSEV

Note:

(1) Minimum pad size.

Electrical Characteristics

Unless specified: V
Fixed mode (V

retemaraPlobmySsnoitidnoCniMpyTxaMstinU

= 0V, Adjustable mode (V

SHDN

= GND): VIN = (V

ADJ

+ 0.7V) to 5.5V and I

OUT

NI

NDHS

D

)1(

tneibmAotnoitcnuJecnatsiseRlamrehT

ces01)gniredloS(erutarepmeTdaeLT

ADJ

> V

): V

TH(ADJ)

IN

= 0A to 500mA. Values in bold apply over full operating temperature range.

OUT

θ

AJ

A

J

GTS

DAEL

DSE

= 2.2V to 5.5V and I

= 0A to 500mA,

OUT

4-051ot0C°

7ot3.0-V

Vot3.0-

NI

V

detimiLyllanretnIW

571W/C°

58ot04-C°

051ot56-C°

003C°

2Vk

NI

egnaRegatloVylppuSV

tnerruCtnecseiuQI

NI

Q

V

V

NI

V3.3=58 051 Aµ

NI

V,V5.6=

NDHS

nepO=10.0 00.2 Aµ

2.25.6 V

TUO

)1(

egatloVtuptuO

V

TUO

VNIV=

TUO

I,V7.0+

TUO

Am01=%1-V

TUO

%1+V

)egatloVdexiFlanretnI( %2-%2+

)1(

noitalugeReniL

)1(

noitalugeRdaoL

GER

)ENIL(

GER

)DAOL(

V

V(=

NI

TUO

VNIV=

TUO

I,V5.5ot)V52.0+

TUO

Am01=1.0 4.0 %

V7.0+51.0 04.0 %

2 2006 Semtech Corp. www.semtech.com

POWER MANAGEMENT

Electrical Characteristics

Unless specified: V
Fixed mode (V

retemaraPlobmySsnoitidnoCniMpyTxaMstinU

= 0V, Adjustable mode (V

SHDN

= GND): VIN = (V

ADJ

).tnoC(TUO

)2()1(

egatloVtuoporD

+ 0.7V) to 5.5V and I

OUT

SC1563

> V

ADJ

V

D

): V

TH(ADJ)

= 2.2V to 5.5V and I

IN

= 0A to 500mA. Values in bold apply over full operating temperature range.

OUT

I

TUO

= 0A to 500mA,

OUT

Am2=15Vm

01

I

TUO

Am001=07001Vm

051

I

TUO

Am052=571052Vm

053

I

TUO

Am005=053005Vm

007

timiLtnerruC

I

MIL

5.00.1

A

JDA

)1(

egatloVecnerefeR

V

FER

V

NI

V,V2.2=

V=

JDA

I,

TUO

TUO

Am01=881.1002.1212.1V

671.1422.1

)3(

nerruCniPtsujdAt

)4(

dlohserhTniPtsujdA

I

JDA

V

)JDA(HT

V

V=

JDA

FER

56 051 An

01.0 52.0 04.0 V

NDHS

tnerruCniPnwodtuhSI

dlohserhTniPnwodtuhSV

NDHS

HI

V

NDHS

V,V0=

NI

V

NI

V3.3=5.1 0.5 Aµ

V3.3= 8.1 V

V

LI

V

V3.3= 4.0

NI

noitcetorPerutarepmeTrevO

leveLpirThgiHT

siseretsyHT

IH

TSYH

071°C

01°C

Notes:

(1) Low duty cycle pulse testing with Kelvin connections required.

(2) Defined as the input to output differential at which the output voltage drops to 1% below the value measured at

a differential of 0.7V for 2.5V ≤ V

≤ 3.4V. Not measurable on outputs less than 2.2V due to minimum V

OUT

con-

IN

straints. See typical characteristics curves.

(3) Guaranteed by design.

(4) When V

error amplifier and connects V

exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the

ADJ

instead.

ADJ

3 2006 Semtech Corp. www.semtech.com

POWER MANAGEMENT

Pin Configurations Ordering Information

)3()2()1(

Top View

SOT-23-5

Notes:

(1) Where -X.X denotes voltage options. Available

voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.1V and 3.3V.

(2) Output voltage can be adjusted using external

resistors, see Pin Descriptions.

(3) Only available in tape and reel packaging. A reel

contains 3000 devices.

(4) Lead free product. This product is fully WEEE and RoHS

compliant.

rebmuNtraP

RTX.X-KSI3651CS

)4(

TRTX.X-KSI3651CS

Marking Information

SC1563

egakcaP

5-32-TOS

SOT-23-5

63XX = SC1563, voltage option (example: 6318 for 1.8V option)

yyww = Date code (example: 0008 for week 8 of 2000)

4 2006 Semtech Corp. www.semtech.com

POWER MANAGEMENT

Block Diagram

SC1563

Pin Descriptions

#niPemaNniPnoitcnuFniP

1NDHS aottnerructnecseiuqehtgnicuder,fforotalugerehtsnrutneponipsihtgnivaeL.tupnInwodtuhS

2DNG .sesoprupgniknistaehrofdesuebyamnipsihT.dnuorgecnerefeR

3JDA fI.srotsiserkcabdeeflanretniehtybtestahtotegatlovtuptuoehtstes,dednuorgnehw,nipsihT

4TUO.Am005otpugnicruos,ecivedsihtfotuptuorewopehtsinipsihT

5NI V(neewtebebtsumnipsihtottupnieht,daollluftanoitalugerroF.egatlovtupnI

wolebdellupsinipsihtfidelbaneeblliwecivedehT.)An003<yllacipyt(eulavgnitarepostifonoitcarf

.desugniebtonfiDNGottcennoC.V4.0

:)1egapnotiucriCnoitacilppAeeS(eblliwegatlovtuptuoeht,desuerasrotsiserkcabdeeflanretxe

+

=

V

OUT

VmuminiM

NI

.V2.2=

R2

R2)(R11.200

Volts

TUO

.V5.6dna)V7.0+

5 2006 Semtech Corp. www.semtech.com

POWER MANAGEMENT

Introduction

The SC1563 is intended for applications such as

graphics cards where high current capability and very low

dropout voltage are required. It provides a very simple,

low cost solution that uses little pcb real estate.

Additional features include a shutdown pin to allow for a

very low power consumption standby mode, and a fully

adjustable output.

Component Selection

Input capacitor - a 1µF ceramic capacitor is

recommended. This allows for the device being some

distance from any bulk capacitance on the rail.

Additionally, input dr oop due to load transients is reduced,

improving load transient response. Additional capacitance

may be added if required by the application.

SC1563

Output capacitor - a minimum bulk capacitance of 1µF,

along with a 0.1µF ceramic decoupling capacitor is

recommended. Increasing the bulk capacitance will

improve the overall transient response. The use of

multiple lower value ceramic capacitors in parallel to

achieve the desired bulk capacitance will not cause

stability issues. Although designed for use with ceramic

output capacitors, the SC1563 is extremely tolerant of

output capacitor ESR values and thus will also work

comfortably with tantalum output capacitors.

Noise immunity - in very electrically noisy environments,

it is recommended that 0.1µF ceramic capacitors be

placed from IN to GND and OUT to GND as close to the

device pins as possible.

6 2006 Semtech Corp. www.semtech.com

POWER MANAGEMENT

Typical Characteristics

SC1563

Quiescent Current vs. Junction Temperature

vs. Output Current

150

VIN = 3.3V, V

125

100

75

(µA)

Q

I

50

25

0

-50 -25 0 25 50 75 100 125 150

ADJ

= V

I

I

OUT

= 500mA

OUT

= 0mA

OUT

T

(°C)

J

Output Voltage vs. Junction Temperature

vs. Output Current

0.5
VIN = V

0.4

)

0.3

0.2

OUT(NOM)

0.1

0

-0.1

-0.2

Deviation (%V

OUT

-0.3

V

-0.4

-0.5

-50 -25 0 25 50 75 100 125 150

OUT(NOM)

+ 0.7V

I

= 0mA

OUT

= 500mA

I

OUT

T

(°C)

J

Quiescent Current vs. Input Voltage

vs. Output Current

10000

V

= V

ADJ

OUT

1000

I

= 500mA

(µA)

Q

I

100

10

3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5

OUT

I

= 0mA

OUT

V

(V)

IN

Line Regulation vs. Junction Temperature

vs. Input Voltage Change

0.40
VIN = (V

0.35

I

= 10mA

OUT

0.30

)

0.25

OUT(NOM)

0.20

(%V

LINE

0.15

REG

0.10

0.05

0.00

-50 -25 0 25 50 75 100 125 150

OUT(NOM)

+ 0.25V) to 5.5V

(°C)

T

J

Load Regulation vs.

Junction Temperature

0.20
VIN = V

0.18

0.16

)

0.14

0.12

OUT(NOM)

0.10

(%V

0.08

LOAD

0.06

REG

0.04

0.02

0.00

= 0mA to 500mA

I

OUT

-50 -25 0 25 50 75 100 125 150

OUT(NOM)

+ 0.7V

T

(°C)

J

Dropout Voltage (I

= 0.5A) vs. Output

OUT

Voltage vs. Junction Temperature

700

600

500

400

(mV)

D

300

V

200

100

0

2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6

7 2006 Semtech Corp. www.semtech.com

TJ = 150°C

= 25°C

T

J

T

= -40°C

J

(V)

V

OUT

POWER MANAGEMENT

SC1563

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POWER MANAGEMENT

Typical Characteristics (Cont.)

SC1563

Adjust Pin Threshold Voltage

vs. Junction Temperature

400

2.2V ≤ VIN ≤ 6.5V

375

350

325

300

275

(mV)

250

225

TH(ADJ)

V

200

175

150

125

100

-50 -25 0 25 50 75 100 125 150

(°C)

T

J

Shutdown Pin Threshold Voltage vs. Junction

Temperature vs. Input Voltage

1.8

1.6

1.4

VIH, VIN = 6.5V

Shutdown Pin Current vs.

Junction Temperature

2.50

2.25

2.00

1.75

1.50

(µA)

1.25

SHDN

I

1.00

0.75

0.50

0.25

0.00

-50 -25 0 25 50 75 100 125 150

T

(°C)

J

VIN = 3.3V
V

= 0V

SHDN

1.2

(V)

IL

, V

IH

1.0

V

0.8

0.6

0.4

-50 -25 0 25 50 75 100 125 150

T

J

V

V

V

(°C)

, VIN = 6.5V

IL

, VIN = 2.2V

IH

, VIN = 2.2V

IL

9 2006 Semtech Corp. www.semtech.com

POWER MANAGEMENT

Outline Drawing - SOT-23-5

SC1563

A

e1

D

E/2

N

EI

E

2X

12

ccc

2X N/2 TIPS

e

B

D

aaa C

A2

SEATING PLANE

C

A1

bxN

A

bbb C A-B D

SEE DETAIL

SIDE VIEW

NOTES:

CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).

1.

DATUMS AND TO BE DETERMINED AT DATUM PLANE

2. -A-

DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS

3.
OR GATE BURRS.

-B- -H-

DIM

GAGE

PLANE

A

A1
A2

E1

e1

L1

01
aaa
bbb
ccc

0.25

A

b
c

D

E

e

L

N

DIMENSIONS

INCHES

MIN NOM

-

.035

-

.000
.035

.045

-

.010

-

.003

.114

.060

.063
.110 BSC
.037 BSC

.012

.018

(.024)

5

-

0°

.004

.008

.008

H

.057
.006 0.00
.051
.020 0.25
.009
.118
.069 1.50

10° 0°

DETAIL

MILLIMETERS

NOMMAX MIN MAX

-

0.90

-

1.15

.90

-

-

0.08

2.80.110

2.90

1.60

2.80 BSC

0.95 BSC

1.90 BSC.075 BSC

0.45.024

0.30
(0.60)

5

-

0.10

0.20

0.20

L

(L1)

A

1.45

0.15

1.30

0.50

0.22

3.00

1.75

0.60

10°

01

c

Land Pattern - SOT-23-5

Contact Information

X

DIM

DIM

C

C
G

(C)

P

NOTES:

1.

THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.

G

Z

Y

G
P

P
X

X
Y

Y
Z

Z

DIMENSIONS

DIMENSIONS

INCHES

INCHES

(.098)

.055
.037
.024
.043
.141

Semtech Corporation

Power Management Products Division

200 Flynn Road, Camarillo, CA 930 12

Phone: [phone] F AX [phone]

MILLIMETERS

MILLIMETERS

(2.50)

1.40

0.95

0.60

1.10

3.60

10 2006 Semtech Corp. www.semtech.com