Datasheet LED Drivers for LCD Backlights 1ch Boost up type White LED Driver for large LCD BD9489F 1.1 General Description Key Specifications BD9489F is a high efficiency driver for white LEDs and is Operating power supply voltage range: 9.0V to 35.0V designed for large LCDs. BD9489F has a boost DCDC Oscillator frequency of DCDC: 150kHz (RT=100k) converter that employs an array of LEDs as the light Operating Current: 2.6mA(Typ.) source. Operating temperature range: -40C to +85C BD9489F has some protect functions against fault conditions, such as over-voltage protection (OVP), over current limit protection of DCDC (OCP), LED OCP 1.2 Package(s) W(Typ) x D(Typ) x H(Max) protection, and Over boost protection (FBMAX). SOP16 10.00mm x 6.20mm x 1.71mm Therefore it is available for the fail-safe design over a Pin pitch 1.27mm wide range output voltage. Features DCDC converter with current mode As PWM=L, the retaining function of Vout, FB voltage VOUT discharge function at shutdown LED protection circuit (Over boost protection, LED OCP protection) Over-voltage protection (OVP) for the output voltage Vout Adjustable soft start Adjustable oscillation frequency of DCDC Figure 1. SOP16 Wide range of analog dimming 0.2V to 3.0V UVLO detection for the input voltage of the power stage Applications TV, Computer Display, LCD Backlighting 1.3 Typical Application Circuit(s) Vout VCC VIN VCC UVLO OVP REG58 STB GATE RT CS SS CP DIMOUT PWM ADIM ISENSE FB Rs GND Figure 2. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has not designed protection against radioactive rays . www.rohm.com TSZ02201-0F1F0C100250-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/36 TSZ2211114 001 15.Feb.2016 Rev.003DatasheetDatasheet BD9489F 1.4 Absolute Maximum Ratings (Ta=25C) Ratings Unit Parameter Symbol Power Supply Voltage Vccmax 36 V SS, RT, ISENSE, FB, CS, CP, SS, RT, ISENSE, FB, CS, REG58, DIMOUT, GATE CP, REG58, DIMOUT, 7 V Terminal Voltage GATE OVP, UVLO, PWM, ADIM, STB OVP, UVLO, PWM, 20 V Terminal Voltage ADIM, STB (Note 1) Power Dissipation Pd 625 mW Operating Temperature Range Topr -40 to +85 C Junction Temperature Tjmax 150 C Storage Temperature Range Tstg -55 to +150 C (Note 1) In the case of mounting 1 layer glass epoxy base-plate of 70mm70mm1.6mm, derate by 5.0mW/C when operating above Ta=25C. 1.5 Operating Ratings Parameter Symbol Range Unit Power Supply Voltage VCC 9.0 to 35.0 V DC/DC Oscillation Frequency fsw 50 to 800 kHz Effective Range of ADIM Signal VADIM 0.2 to 3.0 V PWM Input Frequency FPWM 90 to 2000 Hz 1.6 External Components Recommended Range Parameter Symbol Range Unit (Note 2) REG58 Connection Capacitance C 1.0 to 10 F REG58 (Note 2) SS Connection Capacitance C 0.001 to 2.2 F SS RT Connection Resistance R 15 to 300 k RT GATE Drive Capacitance C to 1000 pF GATE (Note 2) Please set connection capacitance above Min value of Recommended Range according to temperature characteristic and DC bias characteristic. 1.7 Pin Configuration 1.8 Physical Dimension Tape and Marking Diagram 1 16 VCC REG58 2 STB 15 CS 3 OVP GATE 14 4 UVLO DIMOUT 13 5 12 SS GND 6 11 PWM ISENSE 7 10 CP FB 8 9 ADIM RT Figure 3. Pin Configuration Figure 4. Physical Dimension Tape and Marking Diagram www.rohm.com TSZ02201-0F1F0C100250-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/36 TSZ22111 15 001 15.Feb.2016 Rev.003