RT8494

7

DS8494-01 November 2015

www.richtek.com

©

Copyright 2015 Richtek Technology Corporation. All rights reserved.

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.

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.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

LED Dimming

Analog Dimming ACTL Pin

Input Current

--

1

--

A

--

10

--

LED Max Current Threshold at

ACTL

--

1.3

--

V

LED Current Off Threshold at

ACTL

--

0.2

--

V

DCTL Input Current

0.3V

--

--

0.5

A

DCTL Threshold Voltage

(Note 6)

2

--

--

V

(Note 6)

--

--

0.3

PWM Control

Switching Frequency

280

370

450

kHz

Minimum Off-Time

--

250

--

ns

Switch Gate Driver

GBIAS Voltage

7.8

8.5

9.2

V

GATE Voltage High

6

7.2

7.8

V

7.5

7.8

7.9

GATE Voltage Low

--

0.5

1

V

--

0.1

0.9

GATE Drive Rise and Fall Time

1nF Load at GATE

--

20

100

ns

PWM Switch Current Limit

Threshold

80

110

145

mV

OVP and Soft-Start

OVP Threshold

--

1.18

--

V

OVP Input Current

0.7V

--

--

0.1

A

Soft-Start Pin Current

--

6

--

A

Thermal Shutdown Protection

--

145

--

C

Thermal Shutdown Hysteresis

--

10

--