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LM3500 Fiches technique(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM3500
Description  Synchronous Step-up DC/DC Converter for White LED
Download  18 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3500 Fiches technique(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
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 VIN =2.7V and specification apply to both LM3500-16 and LM3500-
21.
Symbol
Parameter
Conditions
Min
(Note 7)
Typ
(Note 8)
Max
(Note 7)
Units
I
L
Switch Leakage Current
(LM3500-16)
V
SW = 15V
0.01
0.5
µA
Switch Leakage Current
(LM3500-21)
V
SW = 20V
0.01
2.0
UVP
Input Undervoltage Lockout
ON Threshold
2.4
2.5
2.6
V
OFF Threshold
2.3
2.4
2.5
OVP
Output Overvoltage
Protection (LM3500-16)
ON Threshold
15
15.5
16
V
OFF Threshold
14
14.6
15
Output Overvoltage
Protection (LM3500-21)
ON Threshold
20
20.5
21
OFF Threshold
19
19.5
20
I
Vout
V
OUT Bias Current
(LM3500-16)
V
OUT = 15V, SHDN = VIN
260
400
µA
V
OUT Bias Current
(LM3500-21)
V
OUT = 20V, SHDN = VIN
300
460
I
VL
PMOS Switch Leakage
Current (LM3500-16)
V
OUT = 15V, VSW =0V
0.01
3
µA
PMOS Switch Leakage
Current (LM3500-21)
V
OUT = 20V, VSW =0V
0.01
3
SHDN
Threshold
SHDN Low
0.65
0.3
V
SHDN High
1.1
0.65
Specifications in standard type face are for T
J = 25˚C and those in boldface type apply over the full Operating Temperature
Range (T
J = −40˚C to +125˚C). Unless otherwise specified VIN =2.7V and specification apply to both LM3500-16 and LM3500-
21.
Symbol
Parameter
Conditions
Min
(Note 7)
Typ
(Note 8)
Max
(Note 7)
Units
I
Q
Quiescent Current, Device
Not Switching
FB > 0.54V
0.95
1.2
mA
Quiescent Current, Device
Switching
FB = 0V
1.8
2.5
Shutdown
SHDN = 0V
0.1
2
µA
V
FB
Feedback Voltage
V
IN = 2.7V to 7V
0.47
0.5
0.53
V
∆V
FB
Feedback Voltage Line
Regulation
V
IN = 2.7V to 7V
0.1
0.4
%/V
I
CL
Switch Current Limit
(LM3500-16)
V
IN = 3.0V, Duty Cycle =
70%
400
mA
Switch Current Limit
(LM3500-21)
V
IN = 3.0V, Duty Cycle =
63%
670
I
B
FB Pin Bias Current
FB = 0.5V (Note 9)
45
200
nA
V
IN
Input Voltage Range
2.7
7.0
V
R
DSON
NMOS Switch R
DSON
V
IN = 2.7V, ISW = 300mA
0.43
PMOS Switch R
DSON
V
OUT = 6V, ISW = 300mA
1.1
2.3
D
Limit
Duty Cycle Limit
(LM3500-16)
FB=0V
87
%
Duty Cycle Limit
(LM3500-21)
FB=0V
94
F
SW
Switching Frequency
0.8
1.0
1.2
MHz
www.national.com
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