RT8474A datasheet(4/13 Pages) RICHTEK

4 / 13 page

RT8474A

DS8474A-05 April 2015

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Electrical Characteristics

Recommended Operating Conditions

(Note 5)



Supply Input Voltage ------------------------------------------------------------------------------------------------------ 4.5V to 50V



Junction Temperature Range --------------------------------------------------------------------------------------------

−40°C to 125°C



Ambient Temperature Range --------------------------------------------------------------------------------------------

−40°C to 85°C

(VCC = 5V, CIN = 1

μF, TA = 25°C, unless otherwise specified)

Absolute Maximum Ratings

(Note 1)



Supply Input Voltage, VCC ----------------------------------------------------------------------------------------------

−0.3V to 60V



SW Pin Voltage at Switching off, ISP, ISN, OVP ------------------------------------------------------------------

−0.3V to 60V



CREG Voltage --------------------------------------------------------------------------------------------------------------

−0.3V to 6V



CTL Voltage (Note 2) ----------------------------------------------------------------------------------------------------

−0.3V to 20V



Power Dissipation, PD @ TA = 25

°C

SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------------- 3.44W



Package Thermal Resistance (Note 3)

SOP-8 (Exposed Pad),

θJA ---------------------------------------------------------------------------------------------- 29°C/W

SOP-8 (Exposed Pad),

θJC --------------------------------------------------------------------------------------------- 2°C/W



Junction Temperature ----------------------------------------------------------------------------------------------------- 150

°C



Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260

°C



Storage Temperature Range --------------------------------------------------------------------------------------------

−65°C to 150°C



ESD Susceptibility (Note 4)

HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV

MM (Machine Model) ----------------------------------------------------------------------------------------------------- 200V

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Overall

Regulator Output Voltage

VCREG

ICREG = 20mA

4.5

5.5

Supply Current

IVCC

 0.4V

VIN Rising

4.2

4.5

VIN Under-Voltage Lockout

Threshold

VUVLO

VIN Falling

3.9

4.1

Current Sense Amplifier

Input Threshold (VISP VISN)

VCTL  1.25V

100

103

Input Current

IISP

VISP = 24V

200

A

Input Current

IISN

VISN = 24V

A

Output Current

IVC

2.4V > VC > 0.3V

±10

A

VC Threshold for CTL Switch Off

0.4

LED Dimming

Input Current of CTL Pin

ICTL

0.2V

 VCTL  1.2V

A

LED Current Off Threshold at

CTL

VCTL_OFF

0.15

0.2

0.25

LED Current On Threshold at

CTL

VCTL_ON

1.2

1.5

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