BD9489F Datasheet, PDF (3/39 Pages) Rohm – DCDC converter with current mode

BD9489F
Datasheet
1.8 Electrical Characteristics (Unless otherwise specified, Ta=25°C，VCC=24V)
Parameter
Symbol
Limit
Unit
Min. Typ. Max.
【Total Current Consumption】
Circuit Current
Icc
－
2.6
5.2
mA
Circuit Current (standby)
IST
－
40
80
μA
【UVLO Block】
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
UVLO Pin Leak Current
VUHYS
UVLO_LK
250
300
350
mV
-2
0
2
μA
【DC/DC Block】
ISENSE Threshold Voltage 1
VLED1
0.225 0.233 0.242
V
ISENSE Threshold Voltage 2
VLED2
0.656 0.667 0.677
V
ISENSE Threshold Voltage 3
VLED3
0.988 1.000 1.012
V
ISENSE Clamp Voltage
VLED4
0.989 1.015 1.040
V
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
FCT
RT_DET
VRT
RRT_L
MAX_DUTY
RONSO
RONSI
ISSSO
RSS_L
VSS_END
IFBSO
142.5
-0.3
1.6
-
90
2.5
2.0
-3.75
-
3.52
-115
150
-
2.0
2.0
95
5.0
4.0
-3.0
3.0
3.70
-100
157.5
VRT
×90%
2.4
4.0
99
10.0
8.0
-2.25
5.0
3.88
-85
KHz
V
V
kΩ
%
Ω
Ω
μA
kΩ
V
μA
FB Sink Current
IFBSI
85
100 115
μA
OCP Detect Voltage
OCP Latch Off Detect Voltage
【DC/DC Protection Block】
OVP Detect Voltage
OVP Detect Hysteresis
OVP Pin Leak Current
VCS
VCS
360
400
440
mV
0.85 1.00 1.15
V
VOVP
2.88 3.00 3.12
V
VOVP_HYS 150
200 250
mV
OVP_LK
-2
0
2
μA
Condition
VSTB=3.0V, PWM=3.0V
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
(as masking analog dimming)
RT=100kΩ
RT=SWEEP DOWN
RT=100kΩ
As latch off
RT=100kΩ
VSS=2.0V
SS=SWEEP UP
VISENSE=0.2V,
VFB=1.0V
VISENSE=2.0V,
VFB=1.0V
CS=SWEEP UP
CS=SWEEP UP
VADIM=3.0V,
VADIM=3.0V,
VOVP SWEEP UP
VOVP SWEEP DOWN
VOVP=4.0V, VSTB=3.0V
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TSZ02201-0F1F0C100250-1-2
29.Oct 2014 Rev.002