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LM2650MX-ADJ Datasheet

  • LM2650MX-ADJ

  • Synchronous Step-Down DC/DC Converter

  • 11頁

  • NSC

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LM2650 Synchronous Step-Down DC/DC Converter
November 2000
LM2650
Synchronous Step-Down DC/DC Converter
General Description
The LM2650 is a step-down DC/DC converter featuring high
efficiency over a 3A to milliamperes load range. This feature
makes the LM2650 an ideal fit in battery-powered applica-
tions that demand long battery life in both run and standby
modes.
The LM2650 also features a logic-controlled shutdown mode
in which it draws at most 25碌A(chǔ) from the input power supply.
The LM2650 employs a fixed-frequency pulse-width modu-
lation (PWM) and synchronous rectification to achieve very
high efficiencies. In many applications, efficiencies reach
95%+ for loads around 1A and exceed 90% for moderate to
heavy loads from 0.2A to 2A.
A low-power hysteretic or
鈥硈leep鈥?/div>
mode keeps efficiencies
high at light loads. The LM2650 enters and exits sleep mode
automatically as the load crosses
鈥硈leep
in鈥?and
鈥硈leep
out鈥?/div>
thresholds. The LM2650 provides nodes for programming
both thresholds via external resistors. A logic input allows the
user to override the automatic sleep feature and keep the
LM2650 in PWM mode regardless of the load level.
An optional soft-start feature limits current surges from the
input power supply at start up and provides a simple means
of sequencing multiple power supplies.
Features
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n
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n
n
n
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n
n
n
n
Ultra high efficiencies (95% possible)
High efficiency over a 3A to milliamperes load range
Synchronous switching of internal NMOS power FETs
Wide input voltage range (4.5V to 18V)
Output voltage adjustable from 1.5V to 16V
Automatic low-power sleep mode
Logic-controlled micropower shutdown (I
QSD
鈮?/div>
25 碌A(chǔ))
Frequency adjustable up to 300 kHz
Frequency synchronization with external signal
Programmable soft-start
Short-circuit current limiting
Thermal shutdown
Available in 24-lead Small-Outline package
Applications
n
n
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Notebook and palmtop personal computers
Portable data terminals
Modems
Portable Instruments
Global positioning devices (GPSs)
Battery-powered digital devices
Typical Application
LM2650-ADJ Efficiency
DS012848-2
DS012848-1
Converting a Four-Cell Li Ion Battery to 5V
漏 2000 National Semiconductor Corporation
DS012848
www.national.com

LM2650MX-ADJ 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 18 V

  • 100 KHz, 300 KHz

  • 1.5 V to 16 V

  • 3 A

  • 1

  • + 125 C

  • SMD/SMT

  • SOIC-24 Wide

  • - 40 C

  • Reel

  • 1000

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