|
|
PDF LM2653MTC-ADJ Data sheet ( Hoja de datos )
| Número de pieza | LM2653MTC-ADJ | |
| Descripción | 1.5A High Efficiency Synchronous Switching Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LM2653MTC-ADJ (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
|
No Preview Available !
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 0.1Ω Switch 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
1 page  
Typical Performance Characteristics (Continued)
Reference Voltage vs Junction Temperature
Sleep Mode Threshold vs Output Voltage (VIN = 5V)
DS101049-29
Connection Diagram
16-Lead TSSOP (MTC)
DS101049-31
Pin Description
Pin Name
1-2 SW
3-5 VIN
6 VCB
7 AVIN
8 SD(SS)
9 FB
10 COMP
11 PGOOD
12 LDELAY
13
14-16
AGND
PGND
DS101049-14
Top View
Order Number LM2653MTC-ADJ
See NS Package Number MTC16
Function
Switched-node connection, which is connected with the source of the internal high-side
MOSFET.
Main power supply input pin. Connected to the drain of the high-side MOSFET.
Bootstrap capacitor connection for high-side gate drive.
Input voltage for control and driver circuits.
Shutdown control input, active low. This pin can also function as soft-start control pin.
Connect a capacitor from this pin to ground.
Output voltage feedback input. Connected to the output voltage.
Compensation network connection. Connected to the output of the voltage error
amplifier.
A constant monitor on the output voltage. PGOOD will go low if the output voltage
exceeds 110% or goes below 80% of its nominal.
A capacitor between this pin to ground sets the delay from the output voltage reaches
80% of its nominal to when the undervoltage latch protection is enabled and PGOOD pin
goes low.
Low-noise analog ground.
Power ground.
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead TSSOP (MTC)
Order Number LM2653MTC-ADJ
NS Package Number MTC16
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
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: [email protected]
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
Email: [email protected]
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 | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM2653MTC-ADJ.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM2653MTC-ADJ | 1.5A High Efficiency Synchronous Switching Regulator | National Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 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, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |