công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

LM3243 bảng dữ liệu(PDF) 11 Page - Texas Instruments

Click here to check the latest version.
tên linh kiện LM3243
Giải thích chi tiết về linh kiện  High-Current Step-Down Converter
Download  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI1 - Texas Instruments

LM3243 bảng dữ liệu(HTML) 11 Page - Texas Instruments

Back Button LM3243 Datasheet HTML 7Page - Texas Instruments LM3243 Datasheet HTML 8Page - Texas Instruments LM3243 Datasheet HTML 9Page - Texas Instruments LM3243 Datasheet HTML 10Page - Texas Instruments LM3243 Datasheet HTML 11Page - Texas Instruments LM3243 Datasheet HTML 12Page - Texas Instruments LM3243 Datasheet HTML 13Page - Texas Instruments LM3243 Datasheet HTML 14Page - Texas Instruments LM3243 Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 32 page
background image
LM3243
www.ti.com
SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015
7 Detailed Description
7.1 Overview
The LM3243 is a high-efficiency step-down DC-DC converter optimized to power the RF power amplifier (PA) in
cell phones, portable communication devices, or battery-powered RF devices with a single Li-Ion battery. It
operates in fixed-frequency pulse width modulation (PWM) mode for 2G transmissions (with MODE = LOW),
automatic mode transition between PFM and PWM mode for 3G/4G RF PA operation (with MODE = HIGH),
forced bypass mode (with BP = HIGH), or in shutdown mode (with EN = LOW).
The fixed-frequency PWM mode provides high efficiency and very low output voltage ripple. In PFM mode, the
converter operates with reduced switching frequencies and lower supply current to maintain high efficiencies.
The forced bypass mode allows the user to drive the output directly from the input supply through a bypass FET.
The shutdown mode turns the LM3243 off and reduces current consumption to 0.02 µA (typical).
In PWM and PFM modes of operation, the output voltage of the LM3243 can be dynamically programmed from
0.4 V to 3.6 V (typical) by adjusting the voltage on VCON. Current overload protection and thermal overload
protection are also provided.
The LM3243 was engineered with Active Current assist and analog Bypass (ACB). This unique feature allows
the converter to support maximum load currents of 2.5 A (minimum) while keeping a small footprint inductor and
meeting all of the transient behaviors required for operation of a multi-mode RF Power Amplifier. The ACB circuit
provides an additional current path when the load current exceeds 1.4 A (typical) or as the switcher approaches
dropout. Similarly, the ACB circuit allows the converter to respond with faster VCON output voltage transition
times by providing extra output current on rising and falling output edges. The ACB circuit also performs the
function of analog bypass. Depending upon the input voltage, output voltage and load current, the ACB circuit
automatically and seamlessly transitions the converter into analog bypass while maintaining output voltage
regulation and low output voltage ripple. Full bypass (100% duty cycle operation) will occur if the total dropout
resistance in bypass mode (Rtot_drop = 45 mΩ) is insufficient to regulate the output voltage.
The LM3243 device’s 16-pin DSBGA package is the best solution for space-constrained applications such as cell
phones and other hand-held devices. The high switching frequency, 2.7 MHz (typical) in PWM mode, reduces
the size of input capacitors, output capacitors and of the inductor. Use of a DSBGA package is best suited for
opaque case applications and requires special design considerations for implementation. (Refer to DSBGA
Package Assembly and Use.) Because the LM3243 does not implement UVLO, the system controller should set
EN = LOW during power-up and UVLO conditions. (Refer to Shutdown Mode).
Copyright © 2010–2015, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: LM3243


Số phần tương tự - LM3243

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Texas Instruments
LM3243 TI1-LM3243 Datasheet
139Kb / 5P
[Old version datasheet]   High-Current Step-Down Converter for 2G/3G/4G RF Power
February 24, 2012
LM3243 TI1-LM3243 Datasheet
4Mb / 29P
[Old version datasheet]   High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
REVISED FEBRUARY 2013
LM3243 TI1-LM3243_14 Datasheet
4Mb / 29P
[Old version datasheet]   High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
REVISED FEBRUARY 2013
LM3243 TI-LM3243_15 Datasheet
1Mb / 32P
[Old version datasheet]   LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers
REVISED AUGUST 2015
More results

Mô tả tương tự - LM3243

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Texas Instruments
LM3253 TI1-LM3253_16 Datasheet
990Kb / 25P
[Old version datasheet]   High-Current Step-Down Converter
logo
Linear Technology
LTC3877 LINER-LTC3877 Datasheet
1Mb / 18P
   High Current Step-Down Converter
logo
Maxim Integrated Produc...
MAX16984A MAXIM-MAX16984A_V01 Datasheet
1Mb / 49P
   Automotive High-Current Step-Down Converter
2021
logo
Linear Technology
LTC7851 LINER-LTC7851 Datasheet
925Kb / 20P
   High Output Current 4-Phase Step-Down Converter
LTC3807EFE LINER-LTC3807EFE Datasheet
436Kb / 6P
   Low Quiescent Current, High Voltage Step-Down Converter
logo
ELMOS Semiconductor AG
E522.10 ELMOS-E522.10 Datasheet
192Kb / 2P
   LOW QUIESCENT CURRENT STEP DOWN CONVERTER
logo
Monolithic Power System...
EV2312-Q-00A MPS-EV2312-Q-00A Datasheet
430Kb / 7P
   24V, High Current Synchronous Step-down Converter Evaluation Board
EV8765-Q-00A MPS-EV8765-Q-00A Datasheet
663Kb / 9P
   24V, High Current Synchronous Step-down Converter Evaluation Board
logo
Texas Instruments
TPS65263-Q1 TI1-TPS65263-Q1 Datasheet
1Mb / 47P
[Old version datasheet]   Output Current Triple Synchronous Step-Down Converter
logo
Richtek Technology Corp...
RT8092 RICHTEK-RT8092 Datasheet
327Kb / 27P
   High Efficiency Step-Down Converter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com