DataSheetWiki


LM2653 fiches techniques PDF

National Semiconductor - 1.5A High Efficiency Synchronous Switching Regulator

Numéro de référence LM2653
Description 1.5A High Efficiency Synchronous Switching Regulator
Fabricant National Semiconductor 
Logo National Semiconductor 





1 Page

No Preview Available !





LM2653 fiche technique
November 1999
LM2653
1.5A High Efficiency Synchronous Switching Regulator
General Description
The LM2653 switching regulator provides high efficient
power conversion over a 100:1 load range (1.5A to 15 mA).
This feature makes the LM2653 an ideal fit in
battery-powered applications.
Synchronous rectification is used to achieve up to 97% effi-
ciency. At light loads, the LM2653 enters a low power hyster-
etic or “sleep” mode to keep the efficiency high. In many ap-
plications, the efficiency still exceeds 80% at 15 mA load. A
shutdown pin is available to disable the LM2653 and reduce
the supply current to 7µA.
All the power, control, and drive functions are integrated
within the ICs. The ICs contain patented current sensing cir-
cuity for current mode control. This feature eliminates the ex-
ternal current sensing resistor required by other
current-mode DC-DC converters.
The ICs have a 300 kHz fixed frequency internal oscillator.
The high oscillator frequency allows the use of extremely
small, low profile components.
Protection features include thermal shutdown, input under-
voltage lockout, adjustable soft-start, cycle by cycle current
limit, output overvoltage and undervoltage protections.
Features
n Efficiency up to 97%
n 4V to 14V input voltage range
n 1.5V to 5.0V adjustable output voltage
n 0.1Switch On Resistance
n 300 kHz fixed frequency internal oscillator
n 7 µA shutdown current
n Patented current sensing for current mode control
n Input undervoltage lockout
n Output overvoltage shutdown protection
n Output undervoltage shutdown protection
n Adjustable soft-start
n Adjustable PGOOD delay
n Current limit and thermal shutdown
Applications
n Webpad
n Personal digital assistants (PDAs)
n Computer peripherals
n Battery-powered devices
n Notebook computer video supply
n Handheld scanners
n GXM I/O and core voltage
n High efficiency 5V conversion
Typical Application
Efficiency vs Load Current
(VIN = 5V, VOUT = 3.3V)
DS101049-2
© 1999 National Semiconductor Corporation DS101049
DS101049-30
www.national.com

PagesPages 11
Télécharger [ LM2653 ]


Fiche technique recommandé

No Description détaillée Fabricant
LM2650 Synchronous Step-Down DC/DC Converter National Semiconductor
National Semiconductor
LM2650 LM2650 Synchronous Step-Down DC/DC Converter (Rev. C) Texas Instruments
Texas Instruments
LM2650M-ADJ Synchronous Step-Down DC/DC Converter National Semiconductor
National Semiconductor
LM2651 1.5A High Efficiency Synchronous Switching Regulator National Semiconductor
National Semiconductor

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche