RT8494GS datasheet(7/17 Pages) RICHTEK

7 / 17 page

RT8494

DS8494-01 November 2015

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Note 1.

Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect

device reliability.

Note 2.

If connected with a 20k

Ω serial resistor, ACTL and DCTL can go up to 36V.

Note 3.

θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is

measured at the exposed pad of the package.

Note 4.

Devices are ESD sensitive. Handling precaution is recommended.

Note 5.

The device is not guaranteed to function outside its operating conditions.

Note 6.

Guaranteed by design, not subjected to production test.

Note 7.

The ACTL dimming curve is saturating when VACTL ≥ 1.2V. Please refer to typical operation characteristics curve of ILED

vs VACTL. This item is not subjected to production test.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

LED Dimming

Analog Dimming ACTL Pin

Input Current

IACTL

VACTL = 1.2V

A

VACTL = 0.2V

LED Max Current Threshold at

ACTL

VACTL_On

1.3

LED Current Off Threshold at

ACTL

VACTL_Off

0.2

DCTL Input Current

IDCTL

0.3V

 VDCTL  5V

0.5

A

DCTL Threshold Voltage

VDCTL_H

(Note 6)

VDCTL_L

(Note 6)

0.3

PWM Control

Switching Frequency

fSW

RRSET = 30k

280

370

450

kHz

Minimum Off-Time

RRSET = 30k

250

Switch Gate Driver

GBIAS Voltage

VGBIAS

IGBIAS = 20mA

7.8

8.5

9.2

GATE Voltage High

VGATE_H

IGATE = 50mA

7.2

7.8

IGATE = 100A

7.5

7.8

7.9

GATE Voltage Low

VGATE_L

IGATE = 10mA

0.5

IGATE= 100A

0.1

0.9

GATE Drive Rise and Fall Time

1nF Load at GATE

100

PWM Switch Current Limit

Threshold

ISW_LIM

110

145

OVP and Soft-Start

OVP Threshold

VOVP_th

1.18

OVP Input Current

IOVP

0.7V

 VOVP  1.5V

0.1

A

Soft-Start Pin Current

ISS

VSS  2V

A

Thermal Shutdown Protection

TSD

145

C

Thermal Shutdown Hysteresis

TSD

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