RT8489 Datasheet, PDF (6/16 Pages) Richtek Technology Corporation – High Voltage 4-CH LED Driver Controller

RT8489
Parameter
Symbol
Test Conditions
LED Current On Threshold at ACTL V_{ACTL_ON}
DCTL Input Current
I_DCTL
PWM Boost Converter
V_DCTL ≤ 6V
Switching Frequency
f_SW
Minimum Off-Time
VLED Threshold for No Connection V_LED
R_SET = 40kΩ
R_SET = 40kΩ
Regulated V_LED
Amplifier Output Current
VC Threshold for PWM Switch Off
V_LED
I_VC
Highest Voltage LED String
2.4V > V_VC > 0.2V
Switch Gate Driver
GBIAS Voltage
GATE High Voltage
GATE Low Voltage
GATE Drive Rise and Fall Time
V_GBIAS
V_{GATE_H}
V_{GATE_L}
I_GBIAS = 20mA
I_GATE = −20mA
I_GATE = −0.1mA
I_GATE = 20mA
I_GATE = 0.1mA
1nF load at Gate
LED Current Sources Gate Driver
GATE1 to 4 High Voltage
GATE1 to 4 Low Voltage
OVP and Soft-Start
V_{GATEx_H}
V_{GATEx_L}
I_GATEx = −2mA
I_GATEx = −0.1mA
I_GATEx = 2mA
I_GATEx = 0.1mA
OVP Threshold
OVP Input Current
Soft-Start Pin Current
Thermal Protection
V_OVP
I_OVP
I_SS
V_OVP ≤ 1.23V
V_SS ≤ 3.2V
Thermal Shutdown temperature
Thermal Shutdown Hysteresis
T_SD
ΔT_SD
Min Typ Max Unit
--
1.4
--
V
--
--
1
μA
220 280 340 kHz
-- 300 --
ns
--
0.1
--
V
--
0.7
--
V
--
±30 --
μA
--
0.7
--
V
--
10
--
V
--
7.7
--
V
--
8.2
--
--
0.7
--
V
--
0.4
--
--
20
--
ns
--
8.1
--
V
--
8.3
--
--
0.8
--
V
--
0.6
--
-- 1.23 --
V
--
1
--
μA
--
8
--
μA
-- 150 --
°C
--
20
--
°C
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. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
is a registered trademark of Richtek Technology Corporation.
DS8489-00 November 2012