RT8477A datasheet(4/13 Pages) RICHTEK

4 / 13 page

RT8477A

DS8477A-02 April 2015

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Electrical Characteristics

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Overall

Regulator Output Voltage

VCREG

ICREG = 20mA

4.5

5.5

Supply Current

IVCC

VCTL = 3V

VIN Under Voltage Lockout

Threshold

VUVLO

VIN Rising

4.25

4.5

VIN Falling

4.2

Current Sense Amplifier

Input Threshold (VISP  VISN)

4.5

 Common Mode  20V

100

105

Input Current

IISP

VISP = 24V

150

A

IISN

VISN = 24V

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

0.33

0.4

LED Current On Threshold at CTL

VCTL_ON

2.5

Recommended Operating Conditions

(Note 5)



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



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

−40°C to 125°C



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

−40°C to 85°C

Absolute Maximum Ratings

(Note 1)



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

−0.3V to 60V



ISP, ISN ------------------------------------------------------------------------------------------------------------

−0.3V to 60V



SENS, DRV, CREG, VC Pin Voltage -----------------------------------------------------------------------

−0.3V to 5.5V



CTL Pin Voltage -------------------------------------------------------------------------------------------------

−0.3V to 20V (Note 2)



Power Dissipation, PD @ TA = 25

°C

SOP-8 (Exposed Pad) ----------------------------------------------------------------------------------------- 3.26W



Package Thermal Resistance (Note 3)

SOP-8 (Exposed Pad),

θJA ------------------------------------------------------------------------------------ 30.6°C/W

SOP-8 (Exposed Pad),

θJC ----------------------------------------------------------------------------------- 3.4°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

(VCC = 12V, TA = 25

°C, unless otherwise specified)

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