Datasheet
Table Of Contents
- FEATURES
- Applications
- DESCRIPTION
- Absolute Maximum Ratings
- Electrical Characteristics
- Typical Performance Characteristics
- Block Diagram
- Theory of Operation
- Application Hints
- SELECTING THE EXTERNAL CAPACITORS
- SELECTING THE OUTPUT CAPACITOR
- SELECTING THE INPUT CAPACITOR
- FEED-FORWARD COMPENSATION
- SELECTING DIODES
- LAYOUT HINTS
- SETTING THE OUTPUT VOLTAGE
- SWITCHING FREQUENCY
- DUTY CYCLE
- INDUCTANCE VALUE
- MAXIMUM SWITCH CURRENT
- CALCULATING LOAD CURRENT
- DESIGN PARAMETERS VSW AND ISW
- THERMAL CONSIDERATIONS
- MINIMUM INDUCTANCE
- INDUCTOR SUPPLIERS
- SHUTDOWN PIN OPERATION
- Application Hints
- Revision History
LM2733 ³;´
SW
FB
GND
V
IN
SHDN
U1
R3
51K
SHDN
GND
5 V
IN
C1
2.2PF
R2
13.3K
CF
120pF
D1
MBR0530
R1/205K
L1/10PH
C2
4.7PF
20V
OUT
170mA
(TYP)
LM2733 ³;´
SW
FB
GND
V
IN
SHDN
U1
R3
51K
SHDN
GND
5 V
IN
C1
2.2PF
R2
13.3K
CF
220pF
D1
MBR0520
R1/117K
L1/10PH
C2
4.7PF
12V
OUT
330mA
(TYP)
LM2733
www.ti.com
SNVS209E –NOVEMBER 2002–REVISED APRIL 2013
LM2733 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
Check for Samples: LM2733
1
FEATURES
DESCRIPTION
The LM2733 switching regulators are current-mode
2
• 40V DMOS FET Switch
boost converters operating fixed frequency of 1.6
• 1.6 MHz (“X”), 0.6 MHz (“Y”) Switching
MHz (“X” option) and 600 kHz (“Y” option).
Frequency
The use of SOT-23 package, made possible by the
• Low R
DS
(ON) DMOS FET
minimal power loss of the internal 1A switch, and use
• Switch Current up to 1A
of small inductors and capacitors result in the
industry's highest power density. The 40V internal
• Wide Input Voltage Range (2.7V–14V)
switch makes these solutions perfect for boosting to
• Low Shutdown Current (<1 µA)
voltages of 16V or greater.
• 5-Lead SOT-23 Package
These parts have a logic-level shutdown pin that can
• Uses Tiny Capacitors and Inductors
be used to reduce quiescent current and extend
• Cycle-by-Cycle Current Limiting
battery life.
• Internally Compensated
Protection is provided through cycle-by-cycle current
limiting and thermal shutdown. Internal compensation
APPLICATIONS
simplifies design and reduces component count.
• White LED Current Source
Table 1. Switch Frequency
• PDA’s and Palm-Top Computers
X Y
• Digital Cameras
1.6 MHz 0.6 MHz
• Portable Phones and Games
• Local Boost Regulator
Typical Application Circuit
1
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2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2002–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.