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Datasheet > 电源电路 > 开关式稳压器或控制器> LT1432CS8-3.3
LT1432CS8-3.3 PDF预览

LT1432CS8-3.3

更新时间： 2024-02-18 01:28:26
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
8页 222K
描述
3.3V High Efficiency Step-Down Switching Regulator Controller

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LT1432CS8-3.3 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, SOP8,.25
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.75模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：30 V最小输入电压：4 V
JESD-30 代码：R-PDSO-G8JESD-609代码：e0
长度：4.9 mm湿度敏感等级：1
功能数量：1端子数量：8
最高工作温度：70 °C最低工作温度：
最大输出电流：1.5 A标称输出电压：3.3 V
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
最大供电电流 (Isup)：0.5 mA表面贴装：YES
切换器配置：SINGLE技术：BIPOLAR
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL宽度：3.9 mm
Base Number Matches：1

LT1432CS8-3.3 数据手册

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LT1432-3.3  
3.3V High Efficiency Step-Down  
Switching Regulator Controller  
U
DESCRIPTIO  
EATURE  
S
F
The LT®1432-3.3 is a control chip designed to operate  
with the LT1171/LT1271 family of switching regulators to  
makeaveryhighefficiency3.3Vstep-down(buck)switch-  
ing regulator. A minimum of external components is  
needed.  
■
■
■
■
■
■
■
■
Accurate Preset 3.3V Output  
Up to 87% Efficiency  
Optional Burst ModeTM Operation for Light Loads  
Can Be Used with Many LTC Switching ICs  
Accurate Ultra-Low-Loss Current Limit  
Operates with Inputs from 4.5V to 30V  
Shutdown Mode Draws Only 15µA  
Uses Small 30µH Inductor  
Included is an accurate current limit which uses only  
60mV sense voltage and uses “free” PC board trace  
material for the sense resistor. Logic controlled electronic  
shutdown mode draws only 15µA battery current. The  
switching regulator operates down to 4.5V input.  
O U  
PPLICATI  
Laptop and Palmtop Computers  
Portable Data-Gathering Instruments  
S
A
The LT1432-3.3 has a logic controlled Burst Mode operation  
to achieve high efficiency at very light load currents (0mA to  
100mA) such as memory keep-alive. In normal switching  
mode, the standby power loss is about 30mW, limiting  
efficiency at light loads. In Burst Mode operation, standby  
loss is reduced to approximately 11mW. Output current in  
this mode is typically in the 5mA to 100mA range.  
■
■
The LT1432-3.3 is available in 8-pin SO and PDIP pack-  
ages. The LT1171/LT1271 is also available in surface  
mount DD packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
D2  
1N5818  
V
IN  
10µH  
3A  
V
SW  
V
IN  
+
Efficiency  
C1  
330µF  
35V  
LT1271  
+
OPTIONAL  
100  
FB  
100µF  
OUTPUT  
V
GND  
C
LT1271, L = 30µH  
16V  
FILTER  
D2**  
C6  
V
IN  
= 7V  
0.02µF  
D2 CONNECTED  
TO OUTPUT  
90  
80  
70  
C3  
+
†
L1  
30µH  
C5  
0.03µF  
R2*  
0.013Ω  
10µF  
V
3.3V  
3A  
***  
OUT  
TANT  
D2 CONNECTED  
TO INPUT  
×
+
D1  
C2  
MBR330p  
+
390µF  
16V  
V
V
DIODE  
C
Burst Mode OPERATION  
(USE mA SCALE)  
V
V
V
IN  
LIM  
LT1432-3.3  
GND  
MODE  
OUT  
MODE LOGIC  
220pF  
*R2 IS MADE FROM PC BOARD  
COPPER TRACES.  
60  
0
0
3A  
60mA  
1A  
2A  
**OPTIONAL CONNECTION FOR D2.  
20mA  
40mA  
†
<0.3V = NORMAL MODE  
>2.5V = SHUTDOWN  
OPEN = Burst Mode  
OPERATION  
FOR CIRCUITS WHICH DO NOT USE  
Burst Mode OPERATION, C5 MAY  
BE PARALLEL WITH A 680Ω, 0.1µF  
IN SERIES TO GIVE WIDE PHASE MARGIN ***MAXIMUM CURRENT IS DETERMINED  
WITH DIFFERENT SWITCHING ICs AND  
OUTPUT CAPACITORS  
EFFICIENCY IS HIGHER, BUT MINIMUM  
LT1432-3.3 TA02  
V INCREASES. SEE APPLICATION  
IN  
INFORMATION SECTION.  
BY THE CHOICE OF LT1071 FAMILY MAIN SWITCHER IC.  
SEE APPLICATION INFORMATION SECTION.  
LT1432-3.3 TA01  
Figure 1. High Efficiency 5V Buck Converter  
1
12345678

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