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B360A

更新时间： 2024-02-17 15:43:35
品牌 Logo 应用领域
凌特 - Linear 稳压器二极管开关光电二极管
页数 文件大小 规格书
24页 293K
描述
42V, 2.5A, 2MHz Step-Down Switching Regulator with 2.7μA Quiescent Current

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中文翻译

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B360A 技术参数

是否Rohs认证： 符合生命周期：Contact Manufacturer
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8541.10.00.80风险等级：5.76
配置：SINGLE二极管类型：RECTIFIER DIODE
最大正向电压 (VF)：0.7 V最大非重复峰值正向电流：100 A
元件数量：1最高工作温度：125 °C
最大输出电流：3 A最大重复峰值反向电压：60 V
子类别：Rectifier Diodes表面贴装：YES
技术：SCHOTTKYBase Number Matches：1

B360A 数据手册

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LT3975  
42V, 2.5A, 2MHz Step-Down  
Switching Regulator with  
2.7µA Quiescent Current  
FEATURES  
DESCRIPTION  
The LT®3975 is an adjustable frequency monolithic buck  
switchingregulatorthatacceptsawideinputvoltagerange  
up to 42V. Low quiescent current design consumes only  
2.7µAofsupplycurrentwhileregulatingwithnoload. Low  
ripple Burst Mode operation maintains high efficiency at  
low output currents while keeping the output ripple below  
15mV in a typical application. The LT3975 can supply up  
to 2.5A of load current and has current limit foldback to  
limit power dissipation during short circuit. A low dropout  
voltage of 500mV is maintained when the input voltage  
drops below the programmed output voltage, such as  
during automotive cold crank.  
n
Ultralow Quiescent Current:  
2.7µA I at 12V to 3.3V  
Q
IN  
OUT  
Low Ripple Burst Mode® Operation  
n
Output Ripple < 15mV  
P-P  
n
n
n
n
n
n
n
n
n
n
n
n
n
Wide Input Range: Operation from 4.3V to 42V  
2.5A Maximum Output Current  
Excellent Start-Up and Dropout Performance  
Adjustable Switching Frequency: 200kHz to 2MHz  
Synchronizable Between 250kHz to 2MHz  
Accurate Programmable Undervoltage Lockout  
Low Shutdown Current: I = 700nA  
Q
Power Good Flag  
Soft-Start Capability  
Thermal Shutdown Protection  
An internally compensated current mode topology is used  
for fast transient response and good loop stability. A high  
efficiency 75mΩ switch is included on the die along with a  
boostSchottkydiodeandthenecessaryoscillator,control,  
andlogiccircuitry. Anaccurate1.02Vthresholdenablepin  
can be driven directly from a microcontroller or used as a  
programmable undervoltage lockout. A capacitor on the  
SS pin provides a controlled inrush current (soft-start).  
Current Limit Foldback with Soft-Start Override  
Saturating Switch Design: 75mΩ On Resistance  
Small, Thermally Enhanced 16-Lead MSOP Package  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Portable Products  
A power good flag signals when V  
reaches 91.6% of  
OUT  
n
Industrial Supplies  
the programmed output voltage. The LT3975 is available  
in a small 16-lead MSOP package with exposed pad for  
low thermal resistance.  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
TYPICAL APPLICATION  
No-Load Supply Current  
4.5  
3.3V Step-Down Converter  
IN REGULATION  
V
IN  
4.3V TO 42V  
4.0  
3.5  
V
IN  
OFF ON  
EN  
PG  
BOOST  
SW  
3.3µH  
0.47µF  
3.0  
2.5  
2.0  
1.5  
10µF  
PDS560  
LT3975  
SS  
RT  
OUT  
FB  
V
3.3V  
2.5A  
1M  
OUT  
10pF  
SYNC  
GND  
10nF  
47µF  
1210  
78.7k  
576k  
1.0  
0
15  
INPUT VOLTAGE (V)  
35  
45  
5
10  
20 25 30  
40  
3975 TA01a  
f = 600kHz  
3975 TA01b  
3975f  
1
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中文翻译

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