SC471_08 datasheet(4/27 Pages) SEMTECH

Part #	SC471

Description	Synchronous Buck Controller with Multi-Level VOUT Transition Support

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Manufacturer	SEMTECH [Semtech Corporation]

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4

SC471/SC471A

www.semtech.com

POWER MANAGEMENT

Electrical Characteristics (continued)

Parameter

Conditions

25°C

-40° to 85°C

Units

Min

Typ

Max

Min

Max

Regulation

Line Regulation Error

Typical Application Circuit

0.04

%/V

Load Regulation Error

Typical Application Circuit

0.3

%

Timing

On-Time

VOUT = 1.1V

250

225

275

ns

Minimum On-Time

100

ns

Minimum Off-Time

350

ns

Maximum Duty Cycle

V

BAT = VOUT + 0.2 FB < 0.7V

85

80

%

Soft-Start

Soft-Start Time

I

OUT = ILIM/2

1000

μs

Analog Inputs/Outputs

VOUT Input Resistance

500

kΩ

FB Input Bias Current

-1

+1

μA

Current Sense

Zero Crossing

Detector Threshold

LX - GND

0

-7

+7

mV

Power Good

Power Good Threshold

1% Hysteresis Typical

-20%

-17%

-23%

V

Threshold Delay Time(1)

5

μs

Voltage Transition Blank Time(1)

G0 or G1 Transition

32

clks

Leakage

1

μA

Fault Protection

ILIM Source Current

10

9

11

μA

ILIM Comparator Offset

0

-10

+10

mV

Current Limit (Negative)

LX - GND

80

60

100

mV

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SC471 Datasheet(PDF) 4 Page - Semtech Corporation

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