BD9489F Datasheet, PDF (1/39 Pages) Rohm – DCDC converter with current mode

Datasheet
LED Drivers for LCD Backlights
1ch Boost up type
White LED Driver for large LCD
BD9489F
1.1 General Description
BD9489F is a high efficiency driver for white LEDs and is
designed for large LCDs. BD9489F has a boost DCDC
converter that employs an array of LEDs as the light
source.
BD9489F has some protect functions against fault
conditions, such as over-voltage protection (OVP), over
current limit protection of DCDC (OCP), LED OCP
protection, and Over boost protection (FBMAX).
Therefore it is available for the fail-safe design over a
wide range output voltage.
Key Specifications
 Operating power supply voltage range: 9.0V to 35.0V
 Oscillator frequency of DCDC: 150kHz (RT=100kΩ)
 Operating Current:
2.6mA(Typ.)
 Operating temperature range:
-40°C to +85°C
1.2 Package(s)
SOP16
W(Typ) x D(Typ) x H(Max)
10.00mm x 6.20mm x 1.71mm
Pin pitch 1.27mm
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
 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
Figure 1. SOP16
1.3 Typical Application Circuit(s)
VCC
VIN
Vout
VCC
REG58
STB
RT
SS
CP
PWM
ADIM
UVLO _OVP
GATE
CS
DIMOUT
ISENSE
FB
Rs
GND
Figure 2. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit ○This product has not designed protection against radioactive rays
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TSZ02201-0F1F0C100250-1-2
29.Oct 2014 Rev.002