DataSheet.es    


PDF LM2650M-ADJ Data sheet ( Hoja de datos )

Número de pieza LM2650M-ADJ
Descripción Synchronous Step-Down DC/DC Converter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



Hay una vista previa y un enlace de descarga de LM2650M-ADJ (archivo pdf) en la parte inferior de esta página.


Total 11 Páginas

No Preview Available ! LM2650M-ADJ Hoja de datos, Descripción, Manual

June 1999
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 25µA from the input power supply.
The LM2650 employs a fixed-frequency pulse-width modula-
tion (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 sleepmode keeps efficiencies
high at light loads. The LM2650 enters and exits sleep mode
automatically as the load crosses sleep inand sleep out
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
n Ultra high efficiencies (95% possible)
n High efficiency over a 3A to milliamperes load range
n Synchronous switching of internal NMOS power FETs
n Wide input voltage range (4.5V to 18V)
n Output voltage adjustable from 1.5V to 16V
n Automatic low-power sleep mode
n Logic-controlled micropower shutdown (IQSD 25 µA)
n Frequency adjustable up to 300 kHz
n Frequency synchronization with external signal
n Programmable soft-start
n Short-circuit current limiting
n Thermal shutdown
n Available in 24-lead Small-Outline package
Applications
n Notebook and palmtop personal computers
n Portable data terminals
n Modems
n Portable Instruments
n Global positioning devices (GPSs)
n Battery-powered digital devices
Typical Application
LM2650-ADJ Efficiency
DS012848-1
Converting a Four-Cell Li Ion Battery to 5V
© 1999 National Semiconductor Corporation DS012848
DS012848-2
www.national.com

1 page




LM2650M-ADJ pdf
Typical Performance Characteristics
IQSD vs Input Voltage
IQS vs Input Voltage
IQ vs Input Voltage
DS012848-3
IQ vs Oscillator Frequency
DS012848-4
RDS(on) Low-Side vs Input Voltage
DS012848-5
RDS(on) High-Side vs Input Voltage
DS012848-6
RDS(on) Low-Side vs Junction
Temperature
DS012848-7
RDS(on) High-Side vs Junction
Temperature
DS012848-8
Oscillator Frequency vs Junction
Temperature
DS012848-9
Oscillator Frequency vs Adjusting Resistor
DS012848-10
Current Limit vs Junction Temperature
DS012848-11
DS012848-12
5
DS012848-13
www.national.com

5 Page





LM2650M-ADJ arduino
Physical Dimensions inches (millimeters) unless otherwise noted
24-Lead Small-Outline Package (M)
Order Number LM2650M-ADJ
NS Package Number M24B
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

11 Page







PáginasTotal 11 Páginas
PDF Descargar[ Datasheet LM2650M-ADJ.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
LM2650M-ADJSynchronous Step-Down DC/DC ConverterNational Semiconductor
National Semiconductor

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar