首页 > National Semiconductor 美国国家半导体 > 方案应用 > LED照明

LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23

LM2733 Has A 40V / 1A Internal FET SOT-23 Package
LM2735 Increased Switch Current At 2.1A
LM2731 特性Features
LM2731 概述Description

The LM2731 switching regulators are current-mode boost converters operating at fixed frequencies of 1.6 MHz (“X” option) and 600 kHz (“Y” option).

The use of SOT-23 package, made possible by the minimal power loss of the internal 1.8A switch, and use of small inductors and capacitors result in the industry's highest power density. The 22V internal switch makes these solutions perfect for boosting to voltages up to 20V.

These parts have a logic-level shutdown pin that can be used to reduce quiescent current and extend battery life.

Protection is provided through cycle-by-cycle current limiting and thermal shutdown. Internal compensation simplifies design and reduces component count.

LM2731 开关频率Switch Frequency
X Y
1.6 MHz 0.6 MHz
LM2731 应用Applications

LM2731 功能框图Block Diagram

LM2731 功能框图Typical Application

LM2731 功能框图Block Diagram

LM2731 功能框图Block Diagram

LM2731 功能框图Block Diagram

LM2731 典型性能Typical Performance
LM2731性能参数Parametrics
Paramaters / Values LM2731 LM2733 LM2735
Output Range 1.23V to 22V Vin to 40V Vin to 24
Switch Current 1.5 Amp 1 Amp 2.25 Amp
Input Min Voltage 2.7 Volt 2.7 Volt 2.7 Volt
Input Max Voltage 14 Volt 14 Volt 5.5 Volt
Frequency Max 600, 1600 kHz 600, 1600 kHz 1700, 550 kHz
Output Min 1.23 Volt 3 Volt 3 Volt
Output Max 22 Volt 40 Volt 24 Volt
Efficiency (peak) 90 % 90 %
Sync Pin No No No
Adj Switch Frequency No No No
Frequency Min 600, 1600 kHz 600, 1600 kHz 475, 1500 kHz
On/Off Pin Yes Yes Yes
PowerGood / Error Flag No No No
PWM Mode Current Current
Topology Boost Boost Boost, Sepic, FlyBack
Step-Up Yes Yes Yes
Inverting No No
Flyback No No Yes
RegType Switching Regulator Switching Regulator Switching Regulator
Adjustable Output Yes Yes
Temperature Min -40 deg C -40 deg C
Temperature Max 125 deg C 125 deg C
Automotive Yes Yes Yes
PowerWise No No
LM2731 芯片订购型号Order
Part Number(s) (NSID) Top View Availability Budgetary Pricing Pack Size
LM2731XMF/NOPB
LM2731XMF
SOT-23 Full production Lead Time: 6 weeks $1.08 each at 1K+ pcs reel of 1000
LM2731XMFX/NOPB
LM2731XMFX
SOT-23 Full production Lead Time: 6 weeks $1.08 each at 1K+ pcs reel of 3000
LM2731YMF/NOPB
LM2731YMF
SOT-23 Full production Lead Time: 6 weeks $1.08 each at 1K+ pcs reel of 1000
LM2731YMFX/NOPB
LM2731YMFX
SOT-23 Full production Lead Time: 6 weeks $1.08 each at 1K+ pcs reel of 3000
LM2731 开发工具
Part Number(s)
(NSID)
Description Availability Budgetary Pricing Pack Size 产品图片
LM2731XEVAL 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 Full production $30.00 each 1 LM2731XEVAL
LM2731YEVAL 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 Full production $30.00 each 1 LM2731YEVAL
LM2731 封装Packaging
Part Number(s)
(NSID)
Weight
(milligrams)
Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM2731XMF/NOPB
LM2731XMF
14.696
14.801
SOT-23
5 1
1
260
260
Detail LM2731XMF/NOPB
LM2731XMF
N/A
S51A
XTT
LM2731XMFX/NOPB
LM2731XMFX
14.696
14.801
SOT-23
5 1
1
260
260
Detail LM2731XMFX/NOPB
LM2731XMFX
N/A
S51A
XTT
LM2731YMF/NOPB
LM2731YMF
14.696
14.801
SOT-23
5 1
1
260
260
Detail LM2731YMF/NOPB
LM2731YMF
N/A
S51B
XTT
LM2731YMFX/NOPB
LM2731YMFX
14.696
14.801
SOT-23
5 1
1
260
260
Detail LM2731YMFX/NOPB
LM2731YMFX
N/A
S51B
XTT
LM2731 标准体系参考Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2731XMF ABCD150 0 34175 0 0 4234000 1 1201409060
LM2731XMFX ABCD150 0 34175 0 0 4234000 1 1201409060
LM2731YMF ABCD150 0 34175 0 0 4234000 1 1201409060
LM2731YMFX ABCD150 0 34175 0 0 4234000 1 1201409060
LM2731 应用技术支持与电子电路设计开发资源下载 Documents