LM2651MTC-3.3 National Semiconductor, LM2651MTC-3.3 Datasheet
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LM2651MTC-3.3
Manufacturer Part Number
LM2651MTC-3.3
Description
DC/DC Converter IC
Manufacturer
National Semiconductor
Datasheets
1.LM2651MTCX-3.3.pdf
(11 pages)
2.LM2651MTC-3.3.pdf
(11 pages)
3.LM2651MTC-3.3.pdf
(10 pages)
Specifications of LM2651MTC-3.3
Input Voltage
14V
Output Voltage
3.3V
No. Of Pins
16
Mounting Type
Surface Mount
Voltage Regulator Type
Buck Switching
Output Current Max
1.5A
Peak Reflow Compatible (260 C)
No
Current Rating
1.5A
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
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© 2000 National Semiconductor Corporation
LM2651
1.5A High Efficiency Synchronous Switching Regulator
General Description
The LM2651 switching regulator provides high efficiency
power conversion over a 100:1 load range (1.5A to 15mA).
This
battery-powered applications that demand long battery life in
both run and standby modes.
Synchronous rectification is used to achieve up to 97% effi-
ciency. At light loads, the LM2651 enters a low power hyster-
etic or “sleep” mode to keep the efficiency high. In many ap-
plications, the efficiency still exceeds 80% at 15mA load. A
shutdown pin is available to disable the LM2651 and reduce
the supply current to less than 10µA.
The LM2651 contains a patented current sensing circuitry for
current mode control. This feature eliminates the external
current sensing resistor required by other current-mode
DC-DC converters.
The LM2651 has a 300 kHz fixed frequency internal oscilla-
tor. The high oscillator frequency allows the use of extremely
small, low profile components.
A programmable soft-start feature limits current surges from
the input power supply at start up and provides a simple
means of sequencing multiple power supplies.
Other protection features include input undervoltage lockout,
current limiting, and thermal shutdown.
Typical Application
feature
Efficiency vs Load Current
makes
(V
IN
= 5V, V
the
OUT
LM2651
= 3.3V)
DS100925
an
DS100925-15
ideal
fit
in
Features
n Ultra high efficiency up to 97%
n High efficiency over a 1.5A to milliamperes load range
n 4V to 14V input voltage range
n 1.8V, 2.5V, 3.3V, or ADJ output voltage
n Internal MOSFET switch with low R
n 300kHz fixed frequency internal oscillator
n 7µA shutdown current
n Patented current sensing for current mode control
n Input undervoltage lockout
n Adjustable soft-start
n Current limit and thermal shutdown
n 16-pin TSSOP package
Applications
n Personal digital assistants (PDAs)
n Computer peripherals
n Battery-powered devices
n Handheld scanners
n High efficiency 5V conversion
DS(on)
of 75m
February 2000
www.national.com
DS100925-1