Datasheet
LED Drivers for LCD Backlights
1ch Boost up type
White LED Driver for large LCD
BD9486F
1.1 General Description
BD9486F is a high efficiency driver for white LEDs and is
designed for large LCDs. BD9486F has a boost DCDC
converter that employs an array of LEDs as the light
source.
BD9486F 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 18.0V
Oscillator frequency of DCDC: 150kHz (RT=100kΩ)
Operating Current:
2.6mA(Typ.)
Operating temperature range:
-40°C to +85°C
W(Typ) x D(Typ) x H(Max)
10.00mm x 6.20mm x 1.71mm
Pin pitch 1.27mm
1.2 Package(s)
SOP16
Features
DCDC converter with current mode
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
Figure 1.
SOP16
Applications
TV, Computer Display, LCD Backlighting
1.3 Typical Application Circuit(s)
Figure 2. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
.
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○This
product has not designed protection against radioactive rays
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TSZ02201-0F1F0C100240-1-2
13.Feb.2014 Rev.004
BD9486F
●1.4
Absolute Maximum Ratings
(Ta=25°C)
Parameter
Power Supply Voltage
STB, OVP, UVLO, PWM, ADIM
Terminal Voltage
SS, RT, ISENSE, FB, CS, CP,
REG50 Terminal Voltage
DIMOUT, GATE Terminal
Voltage
Power Dissipation
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Symbol
Vccmax
STB, OVP, UVLO,
PWM, ADIM
SS, RT, ISENSE, FB, CS,
CP, REG50
DIMOUT, GATE
Pd
Topr
Tjmax
Tstg
Ratings
20
20
7
VCC
625 (*1)
-40 to +85
150
-55 to +150
Unit
V
V
V
V
mW
°C
°C
°C
Datasheet
*1
In the case of mounting 1 layer glass epoxy base-plate of 70mm×70mm×1.6mm,
derate by 5.0mW/
°C when operating
above Ta=25
°C
.
●1.5
Operating Ratings
Parameter
Power Supply Voltage
DC/DC Oscillation Frequency
Effective Range of ADIM Signal
PWM Input Frequency
Symbol
VCC
fsw
VADIM
FPWM
Range
9.0 to 18.0
50 to 800
0.2 to 3.0
90 to 2000
Unit
V
kHz
V
Hz
●1.6
Pin Configuration
●1.7
Physical Dimension and Marking Diagram
BD9486F
Lot No.
Figure 3. Pin Configuration
Figure4. Physical Dimension and Marking Diagram of SOP16
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TSZ02201-0F1F0C100240-1-2
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BD9486F
●1.8
Electrical Characteristics
(Unless otherwise specified, Ta=25°C，VCC=12V)
Parameter
【Total
Current Consumption】
Circuit Current
Circuit Current (standby)
【UVLO
Block】
Operation Voltage（VCC）
Hysteresis Voltage（VCC）
UVLO Release Voltage
UVLO Hysteresis Voltage
UVLO Pin Leak Current
【DC/DC
Block】
ISENSE Threshold Voltage 1
ISENSE Threshold Voltage 2
ISENSE Threshold Voltage 3
ISENSE Clamp Voltage
Oscillation Frequency
RT Short Protection Range
RT Terminal Voltage
RT Pin ON Resistance at OFF
GATE Pin MAX DUTY Output
GATE Pin ON Resistance
(as source)
GATE Pin ON Resistance
(as sink)
SS Pin Source Current
SS Pin ON Resistance at OFF
Soft Start Ended Voltage
FB Source Current
FB Sink Current
OCP Detect Voltage
OCP Latch Off Detect Voltage
【DC/DC
Protection Block】
OVP Detect Voltage
OVP Detect Hysteresis
OVP Pin Leak Current
VOVP
VOVP_HYS
OVP_LK
2.88
150
-2
3.00
200
0
3.12
250
2
V
mV
μA
VOVP SWEEP UP
VOVP SWEEP DOWN
VLED1
VLED2
VLED3
VLED4
FCT
RT_DET
VRT
RRT_L
MAX_DUTY
RONSO
RONSI
ISSSO
RSS_L
VSS_END
IFBSO
IFBSI
VCS
VCS
0.225
0.656
0.988
0.989
142.5
-0.3
1.6
-
90
2.5
2.0
-3.75
-
3.52
-115
85
360
0.85
0.233
0.667
1.000
1.015
150
-
2.0
2.0
95
5.0
4.0
-3.0
3.0
3.70
-100
100
400
1.00
0.242
0.677
1.012
1.040
157.5
VRT
×90%
Datasheet
Symbol
Limit
Min.
－
－
6.5
150
2.88
250
-2
Typ.
Max.
Unit
Condition
Icc
IST
VUVLO_VCC
VUHYS_VCC
VUVLO
VUHYS
UVLO_LK
2.6
40
7.5
300
3.00
300
0
5.2
80
8.5
600
3.12
350
2
mA
μA
V
mV
V
mV
μA
V
V
V
V
KHz
V
V
kΩ
%
Ω
Ω
μA
kΩ
V
μA
μA
mV
V
VSTB=3.0V, PWM=3.0V,
GATE=L,IREG50=0mA
VSTB=0V
VCC=SWEEP UP
VCC=SWEEP DOWN
VUVLO=SWEEP UP
VUVLO=SWEEP DOWN
VUVLO=4.0V
VADIM=0.7V
VADIM=2.0V
VADIM=3.0V
VADIM=3.3V
(at masked analog dimming)
RT=100kΩ
RT=SWEEP DOWN
RT=100kΩ
At latch off
RT=100kΩ
2.4
4.0
99
10.0
8.0
-2.25
5.0
3.88
-85
115
440
1.15
VSS=2.0V
SS=SWEEP UP
VISENSE=0.2V, VADIM=3.0V,
VFB=1.0V
VISENSE=2.0V, VADIM=3.0V,
VFB=1.0V
CS=SWEEP UP
CS=SWEEP UP
VOVP=4.0V, VSTB=3.0V
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TSZ02201-0F1F0C100240-1-2
13.Feb.2014 Rev.004
BD9486F
●1.8
Electrical Characteristics
(Unless otherwise specified, Ta=25°C，VCC=12V)
Parameter
【LED
Protection Block】
LED OCP Detect Voltage
Over Boost Detection Voltage
【Dimming
Block】
ADIM Pin Leak Current
ISENSE Pin Leak Current
DIMOUT Source ON
Resistance
DIMOUT Sink ON Resistance
【REG50
Block】
REG50 Output Voltage 1
REG50 Output Voltage 2
REG50 Available Current
REG50_UVLO Detect Voltage
REG50 Discharge Current
【STB
Block】
STB Pin HIGH Voltage
STB Pin LOW Voltage
STB Pull Down Resistance
【PWM
Block】
PWM Pin HIGH Voltage
PWM Pin LOW Voltage
PWM Pin Pull Down Resistance
【FAIL
Block
】
CP Detect Voltage
CP Charge Current
VCP
ICP
2.85
2.7
3.0
3.0
3.15
3.3
V
μA
VCP=SWEEP UP
PWM_H
PWM_L
RPWM
1.5
-0.3
600
-
-
1000
18
0.8
1400
V
V
kΩ
VPWM=3.0V
STBH
STBL
RSTB
2.0
-0.3
600
-
-
1000
18
0.8
1400
V
V
kΩ
VSTB=3.0V
REG50_1
REG50_2
| IREG50 |
REG50_TH
REG50_DIS
4.95
4.925
5
2.0
3.0
5.00
5.00
-
2.3
5.0
5.05
5.075
-
2.6
7.0
V
V
mA
V
μA
IO=0mA
IO=-5mA
ILADIM
IL_ISENSE
RONSO
RONSI
-2
-2
5.0
4.0
0
0
10
8.0
2
2
20
16
μA
μA
Ω
Ω
VADIM=2.0V
VISENSE=4.0V
Symbol
Limit
Min.
2.88
3.84
Typ.
3.0
4.00
Max.
3.12
4.16
Unit
Condition
Datasheet
VLEDOCP
VFBH
V
V
VISENSE=SWEEP UP
VFB=SWEEP UP
VREG50=SWEEP DOWN
VSTB=0V
STB=ON->OFF, REG50=4.0V,
PWM=L
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TSZ02201-0F1F0C100240-1-2
13.Feb.2014 Rev.004
BD9486F
●2.1
Pin Function
Pin
No.
Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
REG50
STB
OVP
UVLO
SS
PWM
CP
ADIM
RT
FB
ISENSE
GND
DIMOUT
GATE
CS
VCC
Datasheet
IN/OUT
Out
In
In
In
Out
In
Out
In
Out
Out
In
-
Out
Out
In
In
Function
5.0V output voltage pin and shutdown
timer pin
IC ON/OFF pin
Over voltage protection detection pin
Under voltage lock out detection pin
Slow start setting pin
External PWM dimming signal input pin
Charge timer for abnormal state
ADIM signal input pin
DC/DC switching frequency setting pin
Error amplifier output pin
LED current detection input pin
-
Dimming signal output for NMOS
DC/DC switching output pin
DC/DC output current detect pin,
OCP input pin
Power supply pin
Rating [V]
-0.3 to 7
-0.3 to 20
-0.3 to 20
-0.3 to 20
-0.3 to 7
-0.3 to 20
-0.3 to 7
-0.3 to 20
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to VCC
-0.3 to VCC
-0.3 to 7
-0.3 to 20
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TSZ02201-0F1F0C100240-1-2
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