RT7255 datasheet(4/17 Pages) RICHTEK

4 / 17 page

RT7255

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS7255-00

June

2015

Absolute Maximum Ratings

(Note 1)



VIN to GND -------------------------------------------------------------------------------------------------------------

0.3V to 20V



SW to GND -------------------------------------------------------------------------------------------------------------

0.3V to 20V

<10ns---------------------------------------------------------------------------------------------------------------------

5V to 25V



BOOT to GND----------------------------------------------------------------------------------------------------------

0.3V to 26V



BOOT to SW------------------------------------------------------------------------------------------------------------

0.3V to 6V



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

0.3V to 6V



Power Dissipation, PD @ TA = 25C

SOT-23-8----------------------------------------------------------------------------------------------------------------

0.53W



Package Thermal Resistance

(Note 2)

SOT-23-8,

JA----------------------------------------------------------------------------------------------------------186.2C/W

SOT-23-8,

JC----------------------------------------------------------------------------------------------------------47.4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

Recommended Operating Conditions

(Note 4)



Supply Input Voltage -------------------------------------------------------------------------------------------------

4.3V to 18V



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

40C to 85C



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

40C to 125C

Electrical Characteristics

(VIN = 12V, TA = 25C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Supply Current (Shutdown)

ISHDN

VEN = 0V

A

Supply Current (Quiescent)

VEN = 2V, VFB = 1V

0.5

Switch-On Resistance

High-Side

RDS(ON)_H

VBST

SW = 4.8V

230



Low-Side

RDS(ON)_L

PVIN = 5V

130

Current Limit

ILIM

Vally Current

1.7

2.2

2.8

Oscillator Frequency

fSW

500

kHz

Maximum Duty Cycle

DMAX

Minimum On-Time

tON

Feedback Threshold Voltage

VFB

591

600

609

Enable Input Voltage

Logic-High VEN_H

1.5

Logic-Low

VEN_L

0.4

VIN Under-Voltage Lockout

Threshold-Rising

VUVLO

3.55

3.9

4.25

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