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LT3971-3.3 PDF预览

LT3971-3.3

更新时间： 2024-02-16 17:23:44
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 633K
描述
38V, 1.2A, 2MHz Step-Down Regulator with 2.8A Quiescent Current

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LT3971-3.3 数据手册

 浏览型号LT3971-3.3的Datasheet PDF文件第2页浏览型号LT3971-3.3的Datasheet PDF文件第3页浏览型号LT3971-3.3的Datasheet PDF文件第4页浏览型号LT3971-3.3的Datasheet PDF文件第5页浏览型号LT3971-3.3的Datasheet PDF文件第6页浏览型号LT3971-3.3的Datasheet PDF文件第7页 
LT3971/LT3971-3.3/LT3971-5  
38V, 1.2A, 2MHz  
Step-Down Regulator with  
2.8µA Quiescent Current  
FEATURES  
DESCRIPTION  
The LT®3971 is an adjustable frequency monolithic buck  
switchingregulatorthatacceptsawideinputvoltagerange  
up to 38V. Low quiescent current design consumes only  
2.8µAofsupplycurrentwhileregulatingwithnoload. Low  
ripple Burst Mode operation maintains high efficiency at  
low output currents while keeping the output ripple below  
15mV in a typical application. An internally compensated  
current mode topology is used for fast transient response  
and good loop stability. A high efficiency 0.33Ω switch  
is included on the die along with a boost Schottky diode  
and the necessary oscillator, control and logic circuitry.  
An accurate 1V threshold enable pin can be used to shut  
down the LT3971, reducing the input supply current to  
700nA. A capacitor on the SS pin provides a controlled  
inrush current (soft-start). A power good flag signals  
n
Ultralow Quiescent Current:  
2.8µA I Regulating 12V to 3.3V  
Q
IN  
OUT  
n
n
Fixed Output Voltages: 3.3V, 5V,  
2.1µA I Regulating 12V to 3.3V  
Q
IN  
OUT  
Low Ripple Burst Mode® Operation:  
Output Ripple < 15mV  
P-P  
n
n
n
n
n
n
n
n
n
n
n
n
Wide Input Voltage Range: 4.3V to 38V  
1.2A Maximum Output Current  
Adjustable Switching Frequency: 200kHz to 2MHz  
Synchronizable Between 250kHz to 2MHz  
Fast Transient Response  
Accurate 1V Enable Pin Threshold  
Low Shutdown Current: I = 700nA  
Q
Power Good Flag  
Soft-Start Capability  
Internal Compensation  
when V  
reaches 91% of the programmed output volt-  
OUT  
Output Voltage: 1.19V to 30V  
Small Thermally Enhanced 10-Lead MSOP, 16-Lead  
MSOP and (3mm × 3mm) DFN Packages  
age. The LT3971 is available in small 10-lead MSOP and  
3mm × 3mm DFN packages with exposed pads for low  
thermal resistance. A 16-lead MSOP is also offered which  
has enhanced pin-to-pin fault tolerance.  
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.  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Power for Portable Products  
n
Industrial Supplies  
TYPICAL APPLICATION  
No Load Supply Current  
3.3V Step Down Converter  
3.0  
OUTPUT IN REGULATION  
V
IN  
4.5V TO 38V  
V
IN  
EN  
BOOST  
SW  
2.5  
OFF ON  
4.7µF  
LT3971-5  
0.47µF  
4.7µH  
PG  
SS  
2.0  
LT3971-3.3  
LT3971-3.3  
RT  
BD  
V
3.3V  
1.2A  
OUT  
1.5  
1.0  
V
49.9k  
f = 800kHz  
OUT  
SYNC GND  
22µF  
3971 TA01  
5
10  
15  
20  
25  
30  
35  
INPUT VOLTAGE (V)  
3971 TA01b  
3971fd  
1
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