SC4525DEVB datasheet(4/21 Pages) SEMTECH

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SC4525D

Parameter

Conditions

Min

Typ

Max

Units

Minimum Switch On-time

150

Minimum Switch Off-time

100

150

Switch Leakage Current

µA

Minimum Bootstrap Voltage

SW = -3.9A

1.8

2.3

BST Pin Current

SW = -3.9A

100

150

Oscillator

Switching Frequency

SET = 60.4kΩ

275

350

425

kHz

Foldback Frequency

SET = 60.4kΩ, VFB = 0

100

kHz

Soft Start and Overload Protection

SS/EN Shutdown Threshold

0.2

0.3

0.4

SS/EN Switching Threshold

FB = 0 V

0.95

1.2

1.4

Soft-start Charging Current

SS/EN = 0 V

1.9

µA

SS/EN = 1.5 V

1.6

2.4

3.2

Soft-start Discharging Current

1.5

µA

Hiccup Arming SS/EN Voltage

SS/EN Rising

2.15

Hiccup SS/EN Overload Threshold

SS/EN Falling

1.9

Hiccup Retry SS/EN Voltage

SS/EN Falling

0.6

1.0

1.2

Over Temperature Protection

Thermal Shutdown Temperature

165

°C

Thermal Shutdown Hysteresis

°C

Note 1: Switch current limit does not vary with duty cycle.

Electrical Characteristics (Cont.)

Unless otherwise noted, V

IN = 12V, VBST = 15V, VSS = 2.2V, -40°C < TA = TJ < 125°C, RSET = 60.4kΩ.

SC4525DEVB 数据表(PDF) 4 Page - Semtech Corporation

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