SC174 查看數據表（PDF） - Semtech Corporation

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SC174

4A EcoSpeed™ Synchronous Step-Down Regulator with Optional Ultrasonic Power Save

Semtech Corporation 

SC174

Electrical Characteristics (continued)

Unless specified: VIN =5V, TA=+25°C for Typ, -40°C to +85°C for Min and Max, TJ < 125°C

Parameter

Symbol

Conditions

Min

Typ

Max Units

Soft start

Soft start Time(1)

Ultrasonic Power Save

Delay from PWM Switching to Output

Regulation

850

μs

Zero-Crossing Detector Threshold

LX - PGND

0

mV

Ultrasonic Power Save Frequency

25

kHz

Power Good

Power Good Threshold

Power Good Signal Threshold High

116

120

124

%VOUT

Power Good Signal Threshold Low

86

90

93

PGOOD Delay Time(1)

Noise Immunity Delay Time

Leakage

Power Good On-Resistance

Fault Protection

Output Under-Voltage Fault

VDD=3V

VDD=5V

FB with Respect to REF,

8 Consecutive Clocks

1

ms

2

5

µs

1

µA

10

20

Ω

-30

-25

-20

%

Output Over-Voltage Fault

FB with Respect to REF

+16

+20

+24

%

Smart PowerSave

Protection Threshold

OV, UV Fault Noise Immunity Delay

Over-Temperature Shutdown

Enable/Power Save

Output Enabled

Output Disabled

EN/PSV Input Bias Current

Power Save Enabled

Forced Continuous Conduction Mode

FB with Respect to REF

OT Latched

EN/PSV = VDD or 0V

EN/PSV floating

+7

+10

+13

%

5

μs

150

°C

1

V

0.4

V

0.5

8.0

μA

60

%VDD

39

41

44

%VDD

© 2010 Semtech Corporation



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