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LT3970EMS-3.3-TRPBF

更新时间： 2024-11-23 05:43:35
品牌 Logo 应用领域
凌特 - Linear 稳压器二极管
页数 文件大小 规格书
22页 247K
描述
40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

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LT3970EMS-3.3-TRPBF 数据手册

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LT3970/LT3970-3.3/LT3970-5  
40V, 350mA Step-Down  
Regulator with 2.5µA  
Quiescent Current and  
Integrated Diodes  
FEATURES  
DESCRIPTION  
Low Ripple Burst Mode® Operation  
The LT®3970 is an adjustable frequency monolithic buck  
switching regulator that accepts a wide input voltage  
range up to 40V, and consumes only 2.5μA of quiescent  
current. A high efficiency switch is included on the die  
along with the catch diode, boost diode, and the neces-  
saryoscillator, controlandlogiccircuitry. LowrippleBurst  
Mode operation maintains high efficiency at low output  
currents while keeping the output ripple below 5mV in a  
typical application. Current mode topology is used for fast  
transient response and good loop stability. A catch diode  
current limit provides protection against shorted outputs  
and overvoltage conditions. An enable pin with accurate  
threshold is available, producing a low shutdown current  
n
2.5μA I at 12V to 3.3V  
Q
IN  
OUT  
Output Ripple < 5mV  
P-P  
n
n
n
n
n
Wide Input Voltage Range: 4.2V to 40V Operating  
Adjustable Switching Frequency: 200kHz to 2.2MHz  
Integrated Boost and Catch Diodes  
350mA Output Current  
Fixed Output Voltages: 3.3V, 5V  
1.8μA I at 12V  
Q
IN  
n
n
n
n
n
n
n
Accurate 1V Enable Pin Threshold  
Low Shutdown Current: I = 0.7μA  
Q
Internal Sense Limits Catch Diode Current  
Power Good Flag  
Output Voltage: 1.21V to 25V  
of 0.7μA. A power good flag signals when V  
reaches  
OUT  
Internal Compensation  
90% of the programmed output voltage. The LT3970 is  
available in small 10-pin MSOP and 3mm × 2mm DFN  
packages.  
Small 10-Pin MSOP and (3mm × 2mm) DFN Packages  
APPLICATIONS  
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.  
n
Automotive Battery Regulation  
n
Power for Portable Products  
n
Industrial Supplies  
TYPICAL APPLICATION  
5V Step-Down Converter  
Efficiency  
90  
1000  
100  
10  
V
= 12V  
V
IN  
IN  
6V TO 40V  
0.22μF  
80  
70  
60  
50  
40  
V
BOOST  
LT3970  
IN  
22μH  
22pF  
V
OUT  
5V  
OFF ON  
EN  
PG  
SW  
BD  
350mA  
1M  
1
RT  
FB  
22μF  
2.2μF  
GND  
316k  
226k  
f = 600kHz  
0.1  
0.01  
3490 TA01a  
0.01  
0.1  
1
10  
100  
LOAD CURRENT (mA)  
3970 TA01b  
3970fa  
1
1234567...22

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