BD9285F Datasheet, PDF (3/39 Pages) Rohm – Boost 1channel white LED driver For large LCDs

BD9285F
Datasheet
●1.1 Electrical character (Unless otherwise specified Ta=25℃，VCC=12V)
Limit
Parameter
Symbol
Min. Typ. Max. Unit
【Total current consumption】
Circuit current
Icc
－
1.2
1.8
mA
Standby current
【UVLO block】
IST
－
0
3
μA
Operation voltage（VCC）
VUVLO_VCC
6.5
7.5
8.5
V
Hysteresis Voltage（VCC）
VUHYS_VCC 150
300
600
mV
UVLO release voltage
VUVLO
2.88 3.00 3.12
V
UVLO hysteresis voltage
VUHYS
160
200
240
mV
UVLO pin leak current
【DC/DC block】
UVLO_LK
-2
0
2
μA
ISENSE threshold voltage 1
VLED1
1.47 1.50 1.53
V
ISENSE threshold voltage 2
VLED2
3.33 3.50 3.67
V
ISENSE threshold voltage 3
VLED3
-2
-
+2
%
Oscillation frequency
GATE pin MAX DUTY
output
GATE pin ON resistance
(as source)
GATE pin ON resistance
(as sink)
FCT
NMAX_DUTY
RONSO
RONSI
142.5
90
3.0
1.2
150 157. 5 KHz
95
99
%
6.0
12.0
Ω
2.5
5.0
Ω
RT pin voltage
VRT
1.0
1.5
2.0
V
SS pin source current
ISSSO
-4.20 -3.0 -2.14 μA
SS pin Low output voltage
VSS_L
-
0.20 0.50
V
Soft start ended voltage
VSS_END
2.7
3.0
3.3
V
FB source current
IFBSO
-140 -100
-60
μA
FB sink current
IFBSI
60
100
140
μA
OCP detect voltage
VCS
450
500
550
mV
【DC/DC protection block】
OVP detect voltage
VOVP
2.88 3.00 3.12
V
OVP detect hysteresis
VOVP_HYS
50
100
150
mV
SCP detect voltage
VSCP
0.14 0.20 0.26
V
SCP detect hysteresis
VSCP_HYS
25
50
75
mV
OVP pin leak current
OVP_LK
-2
0
2
μA
Condition
VSTB=3V, PWM1=PWM2=0V
VSTB=0V
VCC=SWEEP UP
VCC=SWEEP DOWN
VUVLO=SWEEP UP
VUVLO=SWEEP DOWN
VUVLO=4V
VADIM=1.5V
VADIM=5.0V (as mask analog dimming)
VADIM=0.7V
RT=100kohm
RT=100kohm
ION=-10mA
ION=10mA
RT=100kohm
VSS=2V
VSTB=0V, Ioss=50uA
SS=SWEEP UP
VISENSE=0.2V,
VFB=1.0V
VISENSE=2.0V,
VFB=1.0V
CS=SWEEP UP
VADIM=1.0V,
VADIM=1.0V,
VOVP SWEEP UP
VOVP SWEEP DOWN
VOVP SWEEP DOWN
VOVP=4V
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TSZ22111・15・001
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TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001