SM8122A Datasheet, PDF (4/13 Pages) Nippon Precision Circuits Inc – White LED Driver IC

SM8122A
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Supply voltage range
Input voltage range
SW output voltage range
SW input current
Power dissipation
Operating temperature range
Storage temperature range
Symbol
Rating
Unit
V _DD
−0.3 to 6.5
V
V _IN
V_SS – 0.3 to V_DD + 0.3
V
V _SW
–0.3 to 30
V
I _SW
500
mA
P_D
250 (Ta = 25°C)
mW
T_opr
–40 to 85
°C
T _stg
−55 to 125
°C
Electrical Characteristics
V_DD = 3.6V, V_SS = 0V, Ta = 25°C unless otherwise noted
Parameter
Pin
Symbol
Condition
Rating
Unit
min
typ
max
Supply voltage
VDD
V _DD
2.3
3.6
5.5
V
Maximum output voltage
SW
V_OUT
–
–
25
V
Standby current
VDD
I _STB
V_CE = 0V
–
–
1.0
µA
Quiescent current
V_FB = 1.0V
VDD
I _DD
V_FB = 0V
–
200
400
µA
–
820
1600
µA
SW-Tr ON resister
SW
R_ON I_SW = 100mA, V_DD = 3.6V
–
2.0
3.0
Ω
SW-Tr leak current
SW
I_LEAK V_SW = V_DD
–
–
1.0
µA
Switching frequency
SW
f_OSC V_FB = 0V
1.8
2.0
2.2
MHz
Maximum duty
SW
Duty V_FB = 0V
75
85
90
%
Input voltage
V_IH
CE
V_IL
2.0
–
–
V
–
–
0.6
V
CE
I_CE
V_CE = 3.6V
–
5.0
10
µA
Input current
FB
I_FB
V_FB = 0.5V
–1.0
–
1.0
µA
VOUT
I_VOUT V_OUT = 25V
60
82
120
µA
Soft-start time
T_SS1 Switching stop time
SW
10
20
70
µs
T_SS2 Maximum duty restriction time
–
500
–
µs
FB voltage
FB
V _FB
0.49
0.50
0.51
V
Coil inductance
SW
L _SW
–
4.7
10
µH
Over voltage detection
V _OV
VOUT
Over voltage detection release
V_OVR
25
30.5
36
V
23
28.5
–
V
NIPPON PRECISION CIRCUITS INC.—4