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LT1500CS-3 PDF预览

LT1500CS-3

更新时间: 2024-02-25 12:01:28
品牌 Logo 应用领域
凌特 - Linear 稳压器开关光电二极管
页数 文件大小 规格书
16页 194K
描述
Adaptive-Frequency Current Mode Switching Regulators

LT1500CS-3 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:SOIC包装说明:SOP,
针数:14Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.89Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:CURRENT-MODE
最大输入电压:15 V最小输入电压:1.8 V
标称输入电压:2.3 VJESD-30 代码:R-PDSO-G14
JESD-609代码:e0长度:8.65 mm
湿度敏感等级:1功能数量:1
端子数量:14最高工作温度:70 °C
最低工作温度:最大输出电流:1.3 A
标称输出电压:3.3 V封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):255
认证状态:Not Qualified座面最大高度:1.75 mm
最大供电电流 (Isup):0.32 mA表面贴装:YES
切换器配置:BOOST最大切换频率:500 kHz
温度等级:COMMERCIAL端子面层:TIN LEAD
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL处于峰值回流温度下的最长时间:40
宽度:3.9 mmBase Number Matches:1

LT1500CS-3 数据手册

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LT1500/ LT1501  
Ad a p tive -Fre q ue nc y  
Curre nt Mo d e Switc hing Re g ula to rs  
U
FEATURES  
DESCRIPTION  
The LT®1500 is an adaptive-frequency current mode step-  
up switching regulator with an internal power switch that  
is rated up to 700mA. In contrast to pulse skipping  
switching regulators, the LT1500 uses a current mode  
topology that provides lower noise operation and im-  
proved efficiency. Only at very light loads is Burst ModeTM  
activated to give high efficiency and micropower opera-  
tion. High switching frequency (up to 500kHz) allows very  
small inductors to be used, along with ceramic capacitors  
if desired.  
Low Noise Adaptive-Frequency Current Mode  
Operation Avoids Low Frequency Noise at  
Most Load Currents  
Can Be Externally Synchronized (LT1500)  
Micropower Quiescent Current: 200µA  
Shutdown Current: 8µA Typ  
Internal Loop Compensation  
Low-Battery Comparator Active in Shutdown  
Minimum Input Voltage: 1.8V Typ  
Additional Negative Voltage Feedback Pin (LT1500)  
Up to 500kHz Switching Frequency  
Uses Low Profile, Low Cost Surface Mount Inductors  
TheLT1500operates withinputvoltages from1.8Vto15V  
and has only 200µA operating current dropping to 8µA in  
shutdown. A low-battery comparator is included which  
stays alive in shutdown. A second output feedback pin  
with negative polarity allows negative output voltages to  
be regulated when the switcher is connected up as a Cuk  
or a flyback converter.  
U
APPLICATIONS  
Portable Instrumentation  
Battery Operated Systems  
PDA’s  
Standby Power  
Two package types are available. The LT1500 comes in a  
14-pin SO package, with two options available for fixed  
output (3.3V or 5V) or adjustable operation. A reduced  
feature part, the LT1501, comes in the smaller 8-pin SO  
package with internal frequency compensation. It is also  
available in adjustable and fixed output voltage versions.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
2-Cell to 5V Converter  
D1  
MBR0520L  
22µH  
5V, 200mA  
V
IN  
I
SENSE  
301k  
1%  
2 EACH  
+
ALKALINE  
CELLS  
SHDN  
LBI  
SW  
220µF**  
10V  
TANT  
+
33µF*  
6V  
NiCd OR  
LT1501-5  
OUT  
AVX, TPSC107M006R0150  
AVX, TPSD107M010 R0100  
*
301k  
1%  
LBO  
GND  
**  
SUMIDA CD73-220, CD54-220  
OR CD43-220. SELECT ACCORDING  
TO MAXIMUM LOAD CURRENT  
1nF  
LT1500/01 • TA01  
LOW-BATTERY FLAG  
(USE EXTERNAL PULL-UP)  
1

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