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LM3500 Datasheet(PDF) 4 Page - Texas Instruments

Part # LM3500
Description  LM3500 Synchronous Step-up DC/DC Converter for White LED Applications
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3500 Datasheet(HTML) 4 Page - Texas Instruments

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LM3500
SNVS231G – AUGUST 2003 – REVISED MAY 2013
www.ti.com
Electrical Characteristics
Specifications in standard type face are for TA = 25°C and those in boldface type apply over the Operating Temperature
Range of TA = −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(1)
Typ(2)
Max(1)
Units
IQ
Quiescent Current, Device Not
FB > 0.54V
0.95
1.2
Switching
mA
Quiescent Current, Device
FB = 0V
1.8
2.5
Switching
Shutdown
SHDN = 0V
0.1
2
µA
VFB
Feedback Voltage
VIN = 2.7V to 7V
0.47
0.5
0.53
V
ΔVFB
Feedback Voltage Line
VIN = 2.7V to 7V
0.1
0.4
%/V
Regulation
ICL
Switch Current Limit
VIN = 2.7V,
275
400
480
(LM3500-16)
Duty Cycle = 80%
VIN = 3.0V,
255
400
530
Duty Cycle = 70%
mA
Switch Current Limit
VIN = 2.7V,
420
640
770
(LM3500-21)
Duty Cycle = 70%
VIN = 3.0V,
450
670
800
Duty Cycle = 63%
IB
FB Pin Bias Current
FB = 0.5V(3)
45
200
nA
VIN
Input Voltage Range
2.7
7.0
V
RDSON
NMOS Switch RDSON
VIN = 2.7V, ISW = 300mA
0.43
PMOS Switch RDSON
VOUT = 6V, ISW = 300mA
1.1
2.3
DLimit
Duty Cycle Limit (LM3500-16)
FB = 0V
80
87
%
Duty Cycle Limit (LM3500-21)
FB = 0V
85
94
FSW
Switching Frequency
0.85
1.0
1.15
MHz
ISD
SHDN Pin Current(4)
SHDN = 5.5V
18
30
SHDN = 2.7V
9
16
µA
SHDN = GND
0.1
IL
Switch Leakage Current
VSW = 15V
0.01
0.5
µA
(LM3500-16)
Switch Leakage Current
VSW = 20V
0.01
2.0
(LM3500-21)
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
ON Threshold
15
15.5
16
(LM3500-16)
OFF Threshold
14
14.6
15
V
Output Overvoltage Protection
ON Threshold
20
20.5
21
(LM3500-21)
OFF Threshold
19
19.5
20
IVout
VOUT Bias Current
VOUT = 15V, SHDN = VIN
260
400
(LM3500-16)
µA
VOUT Bias Current
VOUT = 20V, SHDN = VIN
300
460
(LM3500-21)
IVL
PMOS Switch Leakage
VOUT = 15V, VSW = 0V
0.01
3
Current (LM3500-16)
µA
PMOS Switch Leakage
VOUT = 20V, VSW = 0V
0.01
3
Current (LM3500-21)
(1)
All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are
production tested, specified through statistical analysis or specified by design. All limits at temperature extremes are specified via
correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level
(AOQL).
(2)
Typical numbers are at 25°C and represent the most likely norm.
(3)
Feedback current flows out of the pin.
(4)
Current flows into the pin.
4
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Copyright © 2003–2013, Texas Instruments Incorporated
Product Folder Links: LM3500


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