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參數資料
| 型號： | LM2711MT-ADJ/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.4 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 847K |
| 代理商： | LM2711MT-ADJ/NOPB |
LM2711
Step-up PWM DC/DC Converter Integrated with 4 Buffers
General Description
The LM2711 is a compact bias solution for TFT displays. It
has a current mode PWM step-up DC/DC converter with a
1.4A, 0.17
internal switch. Capable of generating 8V at
300mA from a Lithium Ion battery, the LM2711 is ideal for
generating bias voltages for large screen LCD panels. The
LM2711 can be operated at switching frequencies of 600kHz
or 1.25MHz, allowing for easy filtering and low noise. An
external compensation pin gives the user flexibility in setting
frequency compensation, which makes possible the use of
small, low ESR ceramic capacitors at the output. The
LM2711 uses a patented internal circuitry to limit startup
inrush current of the boost switching regulator without the
use of an external softstart capacitor. An external softstart
pin enables the user to tailor the softstart to a specific
application. The LM2711 contains 4 Gamma buffers capable
of supplying 50mA source and sink. The TSSOP-20 package
ensures a low profile overall solution.
Features
n
1.4A, 0.17
, internal power switch
n
V
IN operating range: 2.2V to 7.5V
n
600kHz/1.25MHz selectable frequency step-up DC/DC
converter
n
20 pin TSSOP package
n
Inrush current limiting circuitry
n
External softstart override
n
4 Gamma buffers
Applications
n
LCD Bias Supplies
n
Handheld Devices
n
Portable Applications
n
Cellular Phones/Digital Cameras
Typical Application Circuit
20046831
February 2004
LM271
1
Step-up
PWM
DC/DC
Converter
Integrated
with
4
Buffers
2004 National Semiconductor Corporation
DS200468
www.national.com
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