Semtech Corporation SC1563IMS-1.8TR, SC1563IMS-2.5TR, SC1563IMS-2.8TR, SC1563IMS-3.0TR, SC1563IMS-3.1TR Datasheet

				VERY LOW DROPOUT, LOW	SC1563
				QUIESCENT 500mA REGULATOR

PRELIMINARY - September 11, 2000 TEL:[phone] FAX:[phone] WEB:http://www.semtech.com

DESCRIPTION

The SC1563 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 500 milliamps. Since it has superior 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.

The SC1563 is available as a five terminal fixed or adjustable output voltage device with enable. The device is available in a 5-pin SOT-23 package and an 8-pin MSOP package for higher power dissipation/ lower junction temperature.

FEATURES

•450mV dropout @ 500mA

•Designed to operate with ceramic capacitors

•Adjustable output from 1.200V to 3.3V

•Multiple output voltage options (all parts also adjustable externally using resistors)

•Over current and over temperature protection

•Enable pin

•1µA quiescent current in shutdown

•Low reverse leakage (output to input)

•Full industrial temperature range

APPLICATIONS

•Battery powered systems

•Motherboards

•Peripheral cards

•PCMCIA cards

ORDERING INFORMATION

DEVICE(1)(2)(3)

PACKAGE

SC1563ISK-X.XTR

SOT-23-5L

SC1563IMS-X.XTR

MSOP-8

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 re-

sistors, see Pin Description.

(3)

Only available in tape and reel packaging. A reel

contains 2500 devices (MSOP-8) or 3000 devices

TYPICAL APPLICATION

(SOT-23-5L).

Internally Preset Output Voltage

Externally Set Output Voltage

5

U1

SC1563ISK-X.X

4

5

U1

SC1563ISK-X.X

4

VIN

VIN

VO

VO (X.XV)

VIN

VIN

VO

VO

SHDN

1

SHDN GND

ADJ

SHDN

1

SHDN GND

ADJ

R1

C1

2

3

C2

C1

2

3

R2

C2

VO =	1.200 (R1 +	R2)	Volts
	R2

1

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

						VERY LOW DROPOUT, LOW			SC1563
						QUIESCENT 500mA REGULATOR
		PRELIMINARY - September 11, 2000
		ABSOLUTE MAXIMUM RATINGS
		Parameter					Symbol	Maximum	Units
		Input Voltage					VIN	5.5	V
		Power Dissipation					PD	Internally Limited	W
		Thermal Resistance Junction to Ambient
		MSOP-8(1)					θ JA	206	°C/W
		MSOP-8(2)						95
		SOT-23-5L(1)						256
		Thermal Resistance Junction to Case						39	°C/W
		MSOP-8					θ JC
		SOT-23-5L						81
		Operating Ambient Temperature Range					TA	-40 to+85	°C
		Operating Junction Temperature Range					TJ	-40 to 150	°C
		Storage Temperature Range					TSTG	-65 to 150	°C
		Lead Temperature (Soldering) 10 Sec.					TLEAD	300	°C
		ESD Rating					ESD	2	kV

Notes:

(1)Minimum pad size.

(2)1 square inch of FR-4, double sided, 1oz. minimum copper weight.

ELECTRICAL CHARACTERISTICS

Unless specified: VSHDN = 0V

Adjustable Option (VADJ > VTH(ADJ)): VIN = 2.2 to 5.5V and IO = 10µA to 500mA

Fixed Options (VADJ = GND): VIN = (VO + 0.7V) to 5.5V and IO = 0A to 500mA

Values in bold apply over the full operating temperature range.

Parameter	Symbol	Test Conditions	Min	Typ	Max	Units
VIN
Supply Voltage Range	VIN		2.2		5.5	V
Quiescent Current	IQ	VIN = 3.3V		100	150	µA
		VIN = 5.5V, VSHDN = Open		0.5	2	µA
VO
Output Voltage(1)	VO	VIN = VO + 0.7V, IO = 10mA	0.99VO	VO	1.01VO	V
(Internal Fixed Voltage)			0.98VO	VO	1.02VO
Line Regulation(1)	REG(LINE)	VIN = (VO + 0.25V) to 5.5V, IOUT = 10mA		0.035	0.3	%
Load Regulation(1)	REG(LOAD)	VIN = VO + 0.7V		0.2	0.4	%

2

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

VERY LOW DROPOUT, LOW

SC1563

QUIESCENT 500mA REGULATOR

PRELIMINARY - September 11, 2000

ELECTRICAL CHARACTERISTICS (Cont.)

Unless specified: VSHDN = 0V

Adjustable Option (VADJ > VTH(ADJ)): VIN = 2.2 to 5.5V and IO = 10µA to 500mA

Fixed Options (VADJ = GND): VIN = (VO + 0.7V) to 5.5V and IO = 0A to 500mA

Values in bold apply over the full operating temperature range.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

VO (Cont.)

Dropout Voltage(2)

VD

ILOAD = 2mA

1

5

mV

10

ILOAD = 100mA

75

100

mV

150

ILOAD = 250mA

200

300

mV

400

ILOAD = 500mA

450

550

mV

700

Minimum Load Current(3)

IO

VIN = VO + 0.7V

1

10

µA

Current Limit

ICL

0.50

1.00

A

ADJ

Reference Voltage(1)

VREF

VIN = 2.2V, VADJ = VOUT, IO = 10mA

1.188

1.200

1.212

V

1.176

1.224

Adjust Pin Current(4)

IADJ

VADJ = VREF

50

100

nA

Adjust Pin Threshold(5)

VTH(ADJ)

0.10

0.20

0.40

V

SHDN

Shutdown Pin Current

ISHDN

VSHDN = 0V, VIN = 3.3V

1

10

µA

Shutdown Pin Threshold

VIH

VIN = 3.3V

1.8

V

VIL

VIN = 3.3V

0.4

OVER TEMPERATURE PROTECTION

High Trip Level

THI

165

°C

Hysteresis

THYST

10

°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.

(3)Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement. Adjustable versions only.

(4)Guaranteed by design.

(5)When VADJ exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error amplifier and connects VADJ instead.

3

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320