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LM3500 Datasheet(PDF) 4 Page - Texas Instruments

Part No. LM3500
Description  Synchronous Step-up DC/DC Converter for White LED Applications
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM3500 Datasheet(HTML) 4 Page - Texas Instruments

 
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LM3500
SNVS231F – MAY 2004 – REVISED APRIL 2007
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.
Min
Typ
Max
Symbol
Parameter
Conditions
Units
(1)
(2)
(1)
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 (LM3500-
VIN = 2.7V,
275
400
480
16)
Duty Cycle = 80%
VIN = 3.0V,
255
400
530
Duty Cycle = 70%
mA
Switch Current Limit (LM3500-
VIN = 2.7V,
420
640
770
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 (LM3500-
VOUT = 15V, SHDN = VIN
260
400
16)
µA
VOUT Bias Current (LM3500-
VOUT = 20V, SHDN = VIN
300
460
21)
(1)
All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits
are production tested, guaranteed through statistical analysis or guaranteed by design. All limits at temperature extremes are
guaranteed 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 © 2004–2007, Texas Instruments Incorporated
Product Folder Links: LM3500


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