RT8288 datasheet(4/14 Pages) RICHTEK

4 / 14 page

RT8288

DS8288-03

June 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Absolute Maximum Ratings

(Note 1)

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

−0.3V to 26V

Switch Voltage, SW -----------------------------------------------------------------------------------------

−0.3V to (VIN + 0.3V)

Boot Voltage, BOOT ----------------------------------------------------------------------------------------- (SW

− 0.3V) to (SW + 6V)

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

Junction Temperature ---------------------------------------------------------------------------------------- 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

Recommended Operating Conditions

(Note 4)

Supply Input Voltage, VIN ---------------------------------------------------------------------------------- 4.5V to 21V

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

−40°C to 125°C

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

−40°C to 85°C

Electrical Characteristics

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Current

ISHDN

VEN = 0

μA

Quiescent Current

VEN = 2V, VFB = 1V

0.7

Upper Switch On Resistance

RDS(ON)1

120

Lower Switch On Resistance

RDS(ON)2

Switch Leakage

ILEAK

VEN = 0V, VSW = 0V or 12V

μA

Current Limit

ILIMIT

VBOOT − VSW = 4.8V

5.4

6.5

Oscillator Frequency

fSW

VFB = 0.75V

425

500

575

kHz

Short Circuit Frequency

VFB = 0V

150

kHz

Maximum Duty Cycle

DMAX

VFB = 0.8V

Minimum On Time

tON

100

Feedback Voltage

VFB

4.5V

≤ VIN ≤ 21V

0.796

0.808

0.82

Feedback Current

IFB

Logic-High VIH

5.5

EN Input Threshold

Voltage

Logic-Low VIL

0.4

VEN = 2V

Enable Current

VEN = 0V

μA

Under Voltage Lockout

Threshold

VUVLO

VIN Rising

3.8

4.2

(VIN = 12V, TA = 25

°C unless otherwise specified)

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