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PDF LM2731YMF Data sheet ( Hoja de datos )
| Número de pieza | LM2731YMF | |
| Descripción | 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2003
LM2731
0.6/1.6 MHz Boost Converters With 22V Internal FET
Switch in SOT-23
General Description
The LM2731 switching regulators are current-mode boost
converters operating at fixed frequencies of 1.6 MHz (“X”
option) and 600 kHz (“Y” option).
The use of SOT-23 package, made possible by the minimal
power loss of the internal 1.8A switch, and use of small
inductors and capacitors result in the industry’s highest
power density. The 22V internal switch makes these solu-
tions perfect for boosting to voltages up to 20V.
These parts have a logic-level shutdown pin that can be
used to reduce quiescent current and extend battery life.
Protection is provided through cycle-by-cycle current limiting
and thermal shutdown. Internal compensation simplifies de-
sign and reduces component count.
Switch Frequency
X
1.6 MHz
Y
0.6 MHz
Features
n 22V DMOS FET switch
n 1.6 MHz (“X”), 0.6 MHz (“Y”) switching frequency
n Low RDS(ON) DMOS FET
n Switch current up to 1.8A
n Wide input voltage range (2.7V–14V)
n Low shutdown current (<1 µA)
n 5-Lead SOT-23 package
n Uses tiny capacitors and inductors
n Cycle-by-cycle current limiting
n Internally compensated
Applications
n White LED Current Source
n PDA’s and Palm-Top Computers
n Digital Cameras
n Portable Phones and Games
n Local Boost Regulator
Typical Application Circuit
20059110
© 2003 National Semiconductor Corporation DS200591
20059130
www.national.com
1 page  
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Operating Junction
Temperature Range
Lead Temp. (Soldering, 5 sec.)
Power Dissipation (Note 2)
−65˚C to +150˚C
−40˚C to +125˚C
300˚C
Internally Limited
FB Pin Voltage
SW Pin Voltage
Input Supply Voltage
Shutdown Input Voltage
(Survival)
θJ-A (SOT23-5)
ESD Rating (Note 3)
Human Body Model
−0.4V to +6V
−0.4V to +22V
−0.4V to +14.5V
−0.4V to +14.5V
265˚C/W
2 kV
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range
(−40˚C ≤ TJ ≤ +125˚C). Unless otherwise specified: VIN = 5V, VSHDN = 5V, IL = 0A.
Symbol
Parameter
Conditions
Min
(Note 4)
Typical
(Note 5)
Max
(Note 4)
Units
VIN
VOUT (MIN)
ISW
Input Voltage
Minimum Output Voltage
Under Load
RL = 43Ω
X Option
(Note 8)
RL = 43Ω
Y Option
(Note 8)
RL = 15Ω
X Option
(Note 8)
RL = 15Ω
Y Option
(Note 8)
Switch Current Limit
(Note 6)
VIN = 2.7V
VIN = 3.3V
VIN = 5V
VIN = 2.7V
VIN = 3.3V
VIN = 5V
VIN = 2.7V
VIN = 3.3V
VIN = 5V
VIN = 2.7V
VIN = 3.3V
VIN = 5V
2.7
5.4
8
13
8.25
10.5
14
3.75
5
8.75
5
5.5
9
1.8
1.4
7
10
17
10
12
16
5
6.5
11
6
7.5
11
2
14
V
V
A
RDS(ON)
Switch ON Resistance
ISW = 100 mA
Vin = 5V
260 400 mΩ
500
ISW = 100 mA
Vin = 3.3V
300 450
550
SHDNTH
Shutdown Threshold
Device ON
Device OFF
1.5
V
0.50
ISHDN
VFB
Shutdown Pin Bias
Current
Feedback Pin Reference
Voltage
VSHDN = 0
VSHDN = 5V
VIN = 3V
1.205
0
0
1.230
2
1.255
µA
V
IFB
Feedback Pin Bias
VFB = 1.23V
Current
60 500 nA
IQ
Quiescent Current
VSHDN = 5V, Switching "X"
VSHDN = 5V, Switching "Y"
VSHDN = 5V, Not Switching
VSHDN = 0
FB Voltage Line
2.7V ≤ VIN ≤ 14V
Regulation
2
1.0
400
0.024
0.02
3.0
2
500
1
mA
µA
%/V
FSW
DMAX
Switching Frequency
(Note 7)
Maximum Duty Cycle
(Note 7)
“X” Option
“Y” Option
“X” Option
“Y” Option
1 1.6 1.85
MHz
0.40
0.60
0.8
86 93
92 96
%
5 www.national.com
5 Page 
Typical Performance Characteristics Unless otherwise specified: VIN = 5V, SHDN pin tied to
VIN. (Continued)
Efficiency vs Load Current - "Y"
VIN = 5V, VOUT = 12V
20059147
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM2731YMF.PDF ] | |
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