SC1563IMS-1.8 データシートの表示（PDF） - Semtech Corporation

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SC1563IMS-1.8

HIGH-EFFICIENCY STEP-DOWN DC-DC CONVERTER

Semtech Corporation 

VERY LOW DROPOUT, LOW

QUIESCENT 500mA REGULATOR

SC1563

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

VO (Cont.)

Dropout Voltage(2)

VD

ILOAD = 2mA

ILOAD = 100mA

ILOAD = 250mA

Minimum Load Current(3)

Current Limit

ADJ

Reference Voltage(1)

IO

ICL

VREF

ILOAD = 500mA

VIN = VO + 0.7V

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

Adjust Pin Current(4)

Adjust Pin Threshold(5)

IADJ

VTH(ADJ)

SHDN

Shutdown Pin Current

ISHDN

Shutdown Pin Threshold

VIH

VIL

OVER TEMPERATURE PROTECTION

High Trip Level

Hysteresis

THI

THYST

VADJ = VREF

VSHDN = 0V, VIN = 3.3V

VIN = 3.3V

VIN = 3.3V

Min

Typ

Max Units

1

5

mV

10

75

100 mV

150

200

300 mV

400

450

550 mV

700

1

10

µA

0.50

1.00 A

1.188 1.200 1.212 V

1.176

1.224

50

100 nA

0.10 0.20 0.40 V

1

10

µA

1.8

V

0.4

165

°C

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.

© 2000 SEMTECH CORP.

3

652 MITCHELL ROAD NEWBURY PARK CA 91320

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