RT7280 datasheet(9/22 Pages) RICHTEK

9 / 22 page

RT7274/79/80/81

DS7274/79/80/81-01 February 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

(VIN = 12V, TA = 25

°C, unless otherwise specified)

Electrical Characteristics

Recommended Operating Conditions

(Note 4)

Supply Input Voltage, VIN ---------------------------------------------------------------------------------------- 4.5V to 18V

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

−40°C to 125°C

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

−40°C to 85°C

Absolute Maximum Ratings

(Note 1)

Supply Input Voltage, VIN, VINR -------------------------------------------------------------------------------

−0.3V to 21V

Switch Node, SW --------------------------------------------------------------------------------------------------

−0.8V to (VIN + 0.3V)

Switch Node, SW (<10ns)----------------------------------------------------------------------------------------

−5V to 25V

BOOT to SW, PVCC ----------------------------------------------------------------------------------------------

−0.3V to 6V

Other Pins------------------------------------------------------------------------------------------------------------

−0.3V to 21V

Power Dissipation, PD @ TA = 25

°C

TSSOP-14 (Exposed Pad) --------------------------------------------------------------------------------------- 2.50W

SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------------- 2.04W

Package Thermal Resistance (Note 2)

TSSOP-14 (Exposed Pad),

θJA --------------------------------------------------------------------------------- 40°C/W

SOP-8 (Exposed Pad),

θJA --------------------------------------------------------------------------------------- 49°C/W

SOP-8 (Exposed Pad),

θJC -------------------------------------------------------------------------------------- 15°C/W

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

°C

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

°C

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

−65°C to 150°C

ESD Susceptibility (Note 3)

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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Supply Current

Supply Current (Shutdown)

VEN = 0V

μA

Supply Current (Quiescent)

VEN = 3V, VFB = 1V

0.7

Logic Threshold

Logic High

VIH

1.6

EN Voltage

Logic Low

VIL

0.4

EN Pin Resistance to GND

(RT7274/81)

VEN = 12V

220

440

880

VFB Voltage and Discharge Resistance

Feedback Threshold Voltage

VFB_TH

4.5V

≤ VIN ≤ 18V

0.757 0.765 0.773

Feedback Input Current

IFB

VFB = 0.8V

−0.1

0.1

μA

VOUT Discharge Resistance

RDIS

EN = 0V, VVOUT = 0.5V

100

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