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| LM3501 Datasheet, PDF (4/18 Pages) National Semiconductor (TI) – Synchronous Step-up DC/DC Converter for White LED Applications | |||
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Electrical Characteristics (Continued)
Specifications in standard type face are for TA = 25ËC and those in boldface type apply over the Operating Temperature
Range of TA = â10ËC to +85ËC. Unless otherwise specified VIN = 2.7V and specifications apply to both LM3501-16 and
LM3501-21.
Symbol
Parameter
Conditions
Min
Typ
Max
(Note 6) (Note 7) (Note 6)
Units
ISD
SHDN Pin Current (Note 9)
SHDN = 5.5V
SHDN = 2.7V
1.8
4
1
2.5
µA
SHDN = GND
0.1
ICNTRL
IL
CNTRL Pin Current (Note 9)
Switch Leakage Current
(LM3501-16)
Switch Leakage Current
(LM3501-21)
VCNTRL = 2.7V
VCNTRL = 1V
VSW = 15V
VSW = 20V
10
20
µA
4
15
0.01
0.5
µA
0.01
2.0
UVP
Input Undervoltage Lockout
ON Threshold
OFF Threshold
2.4
2.5
2.6
V
2.3
2.4
2.5
OVP
Output Overvoltage Protection
(LM3501-16)
ON Threshold
OFF Threshold
15
15.5
16
V
14
14.6
15
Output Overvoltage Protection
(LM3501-21)
ON Threshold
OFF Threshold
20
20.5
21
V
19
19.5
20
IVout
VOUT Bias Current
(LM3501-16)
VOUT Bias Current
(LM3501-21)
VOUT = 15V, SHDN = 1.5V
VOUT = 20V, SHDN = 1.5V
260
400
µA
300
460
IVL
PMOS Switch Leakage Current VOUT = 15V, VSW = 0V
(LM3501-16)
PMOS Switch Leakage Current VOUT = 20V, VSW = 0V
(LM3501-21)
0.01
3
µA
0.01
3
CNTRL
Threshold
LED power off
LED power on
75
mV
125
SHDN
SHDN low
Threshold SHDN High
0.65
0.3
V
1.1
0.65
Specifications in standard type face are for TJ = 25ËC and those in boldface type apply over the full Operating Temperature
Range (TJ = â40ËC to +125ËC). Unless otherwise specified VIN =2.7V and specifications apply to both LM3501-16 and
LM3501-21.
Symbol
Parameter
IQ
Quiescent Current, Device Not
Switching
Quiescent Current, Device
Switching
Conditions
FB > 0.54V
FB = 0V
Min
(Note 6)
Typ
(Note 7)
0.95
Max
(Note 6)
1.2
2
2.5
Units
mA
Shutdown
SHDN = 0V
0.1
2
µA
VFB
âVFB
Feedback Voltage
Feedback Voltage Line
Regulation
CNTRL = 2.7V, VIN = 2.7V to 7V 0.485
0.515
0.545
V
CNTRL = 1V, VIN = 2.7V to 7V
0.14
0.19
0.24
VIN = 2.7V to 7V
0.1
0.5
%/V
ICL
Switch Current Limit
(LM3501-16)
Switch Current Limit
(LM3501-21)
VIN = 3.0V,
Duty Cycle = 70%
VIN = 3.0V,
Duty Cycle = 63%
400
mA
670
IB
FB Pin Bias Current
VIN
Input Voltage Range
FB = 0.5V (Note 8)
45
200
nA
2.7
7.0
V
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