LM3501 Datasheet, PDF (3/18 Pages) National Semiconductor (TI) – Synchronous Step-up DC/DC Converter for White LED Applications

Absolute Maximum Ratings (Note 1)
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V_IN
V_OUT (LM3501-16)(Note 2)
V_OUT (LM3501-21)(Note 2)
V_SW (Note 2)
FB Voltage
SHDN Voltage
CNTRL
Maximum Junction Temperature
Lead Temperature
(Soldering 10 sec.)
Vapor Phase
(60 sec.)
Infrared
(15 sec.)
−0.3V to 7.5V
−0.3V to 16V
−0.3V to 21V
−0.3V to V_OUT+0.3V
−0.3V to 7.5V
−0.3V to V_IN+0.3V
−0.3V to 7.5V
150˚C
300˚C
215˚C
220˚C
ESD Ratings (Note 3)
Human Body Model
Machine Model
2kV
200V
Operating Conditions
Junction Temperature
(Note 4)
Supply Voltage
CNTRL Max.
−40˚C to +125˚C
2.7V to 7V
2.7V
Thermal Properties
Junction to Ambient Thermal
Resistance (θ_JA) (Note 5)
75˚C/W
Electrical Characteristics
Specifications in standard type face are for T_A = 25˚C and those in boldface type apply over the Operating Temperature
Range of T_A = −10˚C to +85˚C. Unless otherwise specified V_IN = 2.7V and specifications apply to both LM3501-16 and
LM3501-21.
Symbol
Parameter
I_Q
Quiescent Current, Device Not
Switching
Quiescent Current, Device
Switching
Shutdown
V_FB
Feedback Voltage
∆V_FB
I_CL
Feedback Voltage Line
Regulation
Switch Current Limit
(LM3501-16)
Switch Current Limit
(LM3501-21)
I_B
V_IN
R_DSON
D_Limit
F_SW
FB Pin Bias Current
Input Voltage Range
NMOS Switch R_DSON
PMOS Switch R_DSON
Duty Cycle Limit
(LM3501-16)
Duty Cycle Limit
(LM3501-21)
Switching Frequency
Conditions
FB > 0.54V
FB = 0V
SHDN = 0V
CNTRL = 2.7V,
V_IN = 2.7V to 7V
CNTRL = 1V,
V_IN = 2.7V to 7V
V_IN = 2.7V to 7V
V_IN = 2.7V,
Duty Cycle = 80%
V_IN = 3.0V,
Duty Cycle = 70%
V_IN = 2.7V,
Duty Cycle = 70%
V_IN = 3.0V,
Duty Cycle = 63%
FB = 0.5V (Note 8)
V_IN = 2.7V, I_SW = 300 mA
V_OUT = 6V, I_SW = 300 mA
FB = 0V
FB = 0V
Min
Typ
Max
(Note 6) (Note 7) (Note 6)
0.95
1.2
0.485
2
0.1
0.515
2.5
2
0.545
0.14
0.19
0.24
Units
mA
µA
V
0.1
0.5
%/V
275
400
480
255
400
530
mA
420
640
770
450
670
800
45
200
nA
2.7
7.0
V
0.43
Ω
1.3
2.3
80
87
%
85
94
0.85
1.0
1.15
MHz
3
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