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LTC3633A-2 PDF预览

LTC3633A-2

更新时间： 2024-11-07 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
28页 413K
描述
双通道、3A、20V、单片式、同步降压型稳压器

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中文翻译

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LTC3633A-2 数据手册

 浏览型号LTC3633A-2的Datasheet PDF文件第2页浏览型号LTC3633A-2的Datasheet PDF文件第3页浏览型号LTC3633A-2的Datasheet PDF文件第4页浏览型号LTC3633A-2的Datasheet PDF文件第5页浏览型号LTC3633A-2的Datasheet PDF文件第6页浏览型号LTC3633A-2的Datasheet PDF文件第7页 
LTC3633A-2/LTC3633A-3  
Dual Channel 3A, 20V  
Monolithic Synchronous  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
The LTC®3633A-2 is a high efficiency, dual-channel mono-  
lithicsynchronousbuckregulatorusingacontrolledon-time,  
current mode architecture, with phase lockable switching  
frequency. The two channels can run 180° out of phase to  
relaxtherequirementsforinputandoutputcapacitance.The  
operating supply voltage range is from 3.6V to 20V, making  
it suitable for lithium-ion battery stacks as well as point of  
load power supply applications from a 12V or 5V supply.  
n
3.6V to 20V Input Voltage Range  
n
3A Output Current per Channel  
n
Up to 95% Efficiency  
n
Low Duty Cycle Operation: 5% at 2.25MHz  
n
Selectable 0°/180° Phase Shift Between Channels  
n
Adjustable Switching Frequency: 500kHz to 4MHz  
n
External Frequency Synchronization  
n
Current Mode Operation for Excellent Line and  
Load Transient Response  
Theoperatingfrequencyisprogrammablefrom500kHzto  
4MHz with an external resistor and may be synchronized  
to an external clock signal. The high frequency capabil-  
ity allows the use of small surface mount inductors and  
capacitors. The unique constant frequency/controlled on-  
time architecture is ideal for high step-down ratio applica-  
tions that operate at high frequency while demanding fast  
transient response. An internal phase locked loop servos  
the on-time of the internal one-shot timer to match the  
frequencyoftheinternalclockoranappliedexternalclock.  
n
0.6V Reference Allows Low Output Voltages  
User Selectable Burst Mode® Operation or Forced  
n
Continuous Operation  
n
Output Voltage Tracking and Soft-Start Capability  
n
Short-Circuit Protected  
n
Overvoltage Input and Overtemperature Protection  
n
Power Good Status Outputs  
n
Available in (4mm × 5mm) QFN-28 and 28-Lead  
TSSOP Packages  
APPLICATIONS  
The LTC3633A-2 can select between forced continuous  
mode and high efficiency Burst Mode operation. The  
LTC3633A-2 and LTC3633A-3 differ in their output volt-  
age sense range (refer to Table 1 in the Operation section  
for a description of the entire LTC3633A product family).  
n
Distributed Power Systems  
n
Battery Powered Instruments  
Point of Load Power Supplies  
n
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.  
Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611.  
TYPICAL APPLICATION  
Efficiency vs Load Current  
V
IN  
6V TO 20V  
100  
47µF  
x2  
PV  
PV  
SV  
IN1  
Burst Mode  
OPERATION  
IN2  
IN  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
RUN1  
INTV  
CC  
RUN2  
ITH1  
ITH2  
RT  
2.2µF  
LTC3633A-2  
MODE/SYNC  
PHMODE  
TRACKSS1  
PGOOD1  
TRACKSS2  
PGOOD2  
BOOST2  
BOOST1  
1.5µH  
1µH  
0.1µF  
0.1µF  
V
V
OUT1  
OUT2  
5V AT 3A  
V
OUT  
V
OUT  
= 5V  
= 3.3V  
SW2  
SW1  
3.3V AT 3A  
V
IN  
= 12V  
V
V
V
ON1  
ON2  
FB2  
0.001  
0.01  
0.1  
1
10  
V
FB1  
SGND PGND  
LOAD CURRENT (A)  
73.2k  
45.3k  
10k  
22µF  
10k  
22µF  
3633a23 TA01b  
3633a23 TA01a  
3633a23fb  
For more information www.linear.com/LTC3633A-2  
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