RT7252B datasheet(4/14 Pages) RICHTEK

4 / 14 page

RT7252A/B

DS7252A/B-01 April 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

ISHDN

VEN = 0V

μA

Supply Current

IOUT

VEN = 3V, VFB = 0.9V

0.6

Feedback Voltage

VFB

≤ VIN ≤ 17V

0.788

0.8

0.812

Feedback Current

IFB

VFB = 0.8V

High Side Switch On

Resistance

RDS(ON)1

155

Low Side Switch On

Resistance

RDS(ON)2

150

Upper Switch Current Limit

Min. Duty Cycle, VBOOT − VSW = 4.8V

Maximum Loading = 2A

3.6

Lower Switch Current Limit

From Drain to Source

For RT7252A

300

340

380

Oscillation Frequency

fOSC1

For RT7252B

700

800

900

kHz

VFB = 0V, For RT7252A

Short-Circuit Oscillation

Frequency

fOSC2

VFB = 0V, For RT7252B

170

kHz

VFB = 0.7V, For RT7252A

Maximum Duty Cycle

DMAX

VFB = 0.7V, For RT7252B

(VIN = 12V, TA = 25

°C, unless otherwise specified)

Electrical Characteristics

Recommended Operating Conditions

(Note 4)

Supply Input Voltage, VIN ---------------------------------------------------------------------------------- 4V to 17V

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

−40°C to 125°C

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

−40°C to 85°C

Absolute Maximum Ratings

(Note 1)

Supply Voltage, VIN -----------------------------------------------------------------------------------------

−0.3V to 19V

SW ---------------------------------------------------------------------------------------------------------------

−0.3V to (VIN + 0.3V)

BOOT ----------------------------------------------------------------------------------------------------------- (SW

− 0.3V) to (SW + 0.3V)

All Other Pins -------------------------------------------------------------------------------------------------

−0.3V to 6V

Power Dissipation, PD @ TA = 25

°C

SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W

Package Thermal Resistance (Note 2)

SOP-8 (Exposed Pad),

θJA --------------------------------------------------------------------------------- 75°C/W

SOP-8 (Exposed Pad),

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

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

°C

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

°C

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

−65°C to 150°C

ESD Susceptibility (Note 3)

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

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

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