RT7253A datasheet(4/14 Pages) RICHTEK

4 / 14 page

RT7253A

DS7253A-02 March 2011

www.richtek.com

Electrical Characteristics

(VIN = 12V, TA = 25

°C, unless otherwise specified)

Absolute Maximum Ratings

(Note 1)

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

−0.3V to 18.7V

Input Voltage, SW ---------------------------------------------------------------------------------------------------

−0.3V to (VIN + 0.3V)

VBOOT - VSW -----------------------------------------------------------------------------------------------------------

−0.3V to 6V

Other Pin Voltages -------------------------------------------------------------------------------------------------

−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 Mode) ---------------------------------------------------------------------------------------- 2kV

MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V

Recommended Operating Conditions

(Note 4)

Supply Voltage, VIN ------------------------------------------------------------------------------------------------- 4.5V to 17V

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

−40°C to 125°C

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

−40°C to 85°C

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

VEN = 0V

0.5

μA

Supply Current

VEN = 3 V, VFB = 0.9V

0.8

1.2

Feedback Voltage

VFB

4.5V

≤ VIN ≤ 17V

0.788

0.8

0.812

Error Amplifier

Transconductance

GEA

ΔI

C = ± 10μA

940

μA/V

High Side Switch

On-Resistance

RDS(ON)1

120

Low Side Switch

On-Resistance

RDS(ON)2

120

High Side Switch Leakage

Current

VEN = 0V, VSW = 0V

μA

Upper Switch Current Limit

Min. Duty Cycle, VBOOT−VSW = 4.8V

5.1

Lower Switch Current Limit

From Drain to Source

1.3

COMP to Current Sense

Transconductance

GCS

4.7

A/V

Oscillation Frequency

fOSC1

300

340

380

kHz

Short Circuit Oscillation

Frequency

fOSC2

VFB = 0V

100

kHz

Maximum Duty Cycle

DMAX

VFB = 0.7V

Minimum On Time

tON

100

To be continued

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