LM3501TLX-21 National Semiconductor, LM3501TLX-21 Datasheet - Page 5

• Manufacturer Part Number: LM3501TLX-21
• Description: Synchronous Step-up DC/DC Converter for White LED Applications
• Manufacturer: National Semiconductor

R
D
F
I
I
I
UVP
OVP
I
I
CNTRL
Threshold
SHDN
Threshold
SD
CNTRL
L
Vout
VL
SW
Electrical Characteristics
Symbol
DSON
Limit
Specifications in standard type face are for T
Range (T
LM3501-21.
Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to
be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: This condition applies if V
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 4: The maximum allowable power dissipation is a function of the maximum operating junction temperature, T
resistance, θ
ambient temperature is calculated using: P
Note 5: Junction-to-ambient thermal resistance (θ
board conforming to JEDEC standards. In applications where high maximum power dissipation exists, special care must be paid to thermal dissipation issues when
designing the board layout.
Note 6: 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).
Note 7: Typical numbers are at 25˚C and represent the most likely norm.
Note 8: Feedback current flows out of the pin.
Note 9: Current flows into the pin.
J
JA
= −40˚C to +125˚C). Unless otherwise specified V
NMOS Switch R
PMOS Switch R
Duty Cycle Limit
(LM3501-16)
Duty Cycle Limit
(LM3501-21)
Switching Frequency
SHDN Pin Current (Note 9)
CNTRL Pin Current (Note 9)
Switch Leakage Current
(LM3501-16)
Switch Leakage Current
(LM3501-21)
Input Undervoltage Lockout
Output Overvoltage Protection
(LM3501-16)
Output Overvoltage Protection
(LM3501-21)
V
(LM3501-16)
V
(LM3501-21)
PMOS Switch Leakage Current
(LM3501-16)
PMOS Switch Leakage Current
(LM3501-21)
SHDN low
SHDN High
, and the ambient temperature, T
OUT
OUT
Leakage Current
Leakage Current
Parameter
IN
DSON
DSON
<
V
OUT
D
(MAX) = (T
. If V
A
. See the Thermal Properties section for the thermal resistance. The maximum allowable power dissipation at any
JA
IN
) is highly application and board-layout dependent. The 75
>
J(MAX)
V
(Continued)
OUT
J
= 25˚C and those in boldface type apply over the full Operating Temperature
V
V
FB = 0V
FB = 0V
SHDN = 5.5V
SHDN = 2.7V
SHDN = GND
V
V
V
V
ON Threshold
OFF Threshold
ON Threshold
OFF Threshold
ON Threshold
OFF Threshold
V
V
V
V
LED power off
LED power on
, a voltage greater than V
IN
OUT
CNTRL
CNTRL
SW
SW
OUT
OUT
OUT
OUT
− T
= 2.7V, I
A
= 15V
= 20V
)/θ
= 6V, I
= 15V, SHDN = 1.5V
= 20V, SHDN = 1.5V
= 15V, V
= 20V, V
JA
= 2.7V
= 1V
. Exceeding the maximum allowable power dissipation will cause excessive die temperature.
Conditions
SW
SW
SW
SW
IN
= 300 mA
= 300 mA
5
=2.7V and specifications apply to both LM3501-16 and
= 0V
= 0V
IN
+ 0.3V should not be applied to the V
(Note 6)
Min
o
0.8
2.4
2.3
1.1
15
14
20
19
C/W figure provided was measured on a 4-layer test
J(MAX)
(Note 7)
0.01
0.01
15.5
14.6
20.5
19.5
0.01
0.01
0.65
0.65
Typ
260
300
125
1.3
1.0
1.8
0.1
2.5
2.4
87
94
10
75
1
4
OUT
, the junction-to-ambient thermal
or V
SW
(Note 6)
pins.
Max
0.43
400
460
2.3
1.2
2.5
0.5
2.0
2.6
2.5
0.3
20
15
16
15
21
20
4
3
3
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Units
MHz
mV
µA
µA
µA
µA
µA
%
Ω
V
V
V