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LT3500EDD#TRPBF

更新时间： 2024-11-06 13:09:39
品牌 Logo 应用领域
凌特 - Linear 晶体稳压器开关晶体管光电二极管
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28页 2507K
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LT3500EDD#TRPBF 数据手册

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LT3690  
36V, 4A, 1.5MHz Synchronous  
Step-Down Switching Regulator  
with 70µA Quiescent Current  
DESCRIPTION  
FEATURES  
n
Wide Input Range:  
The LT®3690 is an adjustable frequency monolithic buck  
switching regulator that accepts input voltages up to 36V.  
A high efficiency 90mΩ switch is included on the device  
along with the boost diode and the necessary oscillator,  
control,andlogiccircuitry.Theinternalsynchronouspower  
switch of 30mΩ increases efficiency and eliminates the  
need for an external Schottky catch diode. Current mode  
topology is used for fast transient response and good  
loop stability. Shutdown reduces input supply current to  
less than 1µA. The low ripple Burst Mode maintains high  
efficiency at low output currents while keeping output  
ripple below 15mV in typical applications.  
– Operation from 3.9V to 36V  
– Overvoltage Lockout Protects Circuits  
Through 60V Transients  
n
4A Maximum Output Current  
n
Integrated 30mΩ N-Channel Synchronous Switch  
Low Ripple (<15mV ) Burst Mode® Operation:  
Q
Programmable Input Undervoltage Lockout  
0.8V Feedback Reference Voltage  
Output Voltage: 0.8V to 20V  
Programmable and Synchronizable Oscillator  
(170kHz to 1.5MHz)  
Soft-Startup and Output Voltage Tracking  
Short-Circuit Robust  
Power Good Flag  
n
P-P  
I = 70µA at 12V to 3.3V  
IN  
OUT  
n
n
n
n
TheLT3690featuresrobustoperationandiseasilyconfigu-  
rable. Using a resistor divider on the UVLO pin provides a  
programmable undervoltage lockout. A power good flag  
n
n
n
n
signals when V  
reaches 90% of the programmed out-  
OUT  
Small Thermally Enhanced 4mm × 6mm QFN Package  
put voltage. Protection circuitry senses the current in the  
powerswitchestoprotecttheLT3690againstshort-circuit  
conditions. Frequency foldback and thermal shutdown  
provide additional protection. The LT3690 is available in  
a 4mm × 6mm QFN package with exposed pads for low  
thermal resistance.  
APPLICATIONS  
n
Automotive Systems  
n
Industrial Supplies  
n
Distributed Supply Regulation  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of  
Linear Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
3.3V Step-Down Converter  
Efficiency and Power Loss  
V
IN  
100  
90  
80  
70  
60  
50  
2.5  
2.0  
1.5  
1.0  
0.5  
0
4.5V TO 36V  
V
= 5V  
OUT  
0.68µF  
V
10µF  
IN  
EN  
BST  
SW  
BIAS  
PG  
V
= 3.3V  
OUT  
3.3µH  
3.3V  
4A  
UVLO  
SS  
LT3690  
V
= 5V  
OUT  
V
V
C
V
= 3.3V  
OUT  
316k  
102k  
FB  
CCINT  
22k  
V
= 12V  
IN  
0.47µF  
L = 4.7µH  
SYNC  
RT  
ƒ = 600kHz  
100µF  
GND  
680pF  
32.4k  
0
0.5  
1
1.5  
2
2.5  
3
3.5  
4
ƒ = 600kHz  
LOAD CURRENT (A)  
3690 TA01b  
3690 TA01a  
3690f  
1
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LT3500EDD#TRPBF 替代型号

型号 品牌 替代类型 描述 数据表
LT3500EDD#PBF Linear

完全替代

 LT3500 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller; Package: DFN;

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