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LTC3417A-2

更新时间： 2024-09-25 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
20页 336K
描述
双通道同步、1.5A/1A 4MHz降压型DC/DC稳压器

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中文翻译

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LTC3417A-2 数据手册

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LTC3417A-2  
Dual Synchronous  
1.5A/1A 4MHz  
Step-Down DC/DC Regulator  
FEATURES  
DESCRIPTION  
The LTC®3417A-2 is a dual constant frequency, synchro-  
nous step-down DC/DC converter. Intended for medium  
power applications, it operates from a 2.25V to 5.5V input  
voltagerangeandhasaconstantprogrammableswitching  
frequency, allowing the use of tiny, low cost capacitors  
and inductors 2mm or less in height. Each output voltage  
is adjustable from 0.8V to 5V. Internal synchronous, low  
n
High Efficiency: Up to 95%  
n
1.5A/1A Guaranteed Minimum Output Current  
n
Synchronizable to External Clock  
n
No Schottky Diodes Required  
n
Programmable Frequency Operation: 1.5MHz or  
Adjustable From 0.6MHz to 4MHz  
Low Ripple (<35mV ) BurstMode® Operation  
n
P-P  
R
power switches provide high efficiency without  
I : 125μA in Sleep  
DS(ON)  
Q
n
the need for external Schottky diodes.  
Low R  
Internal Switches  
DS(ON)  
n
n
n
Short-Circuit Protected  
A user selectable mode input allows the user to trade  
off ripple voltage for light load efficiency. Burst Mode  
operation provides high efficiency at light loads, while  
Pulse Skip mode provides low ripple noise at light loads.  
A phase mode pin allows the second channel to operate  
in-phase or 180° out-of-phase with respect to channel 1.  
Out-of-phase operation produces lower RMS current on  
V : 2.25V to 5.5V  
IN  
Current Mode Operation for Excellent Line and Load  
Transient Response  
n
n
n
n
Ultralow Shutdown Current: I < 1μA  
Q
Low Dropout Operation: 100% Duty Cycle  
Power Good Ouput  
Phase Pin Selects 2nd Channel Phase Relationship  
with Respect to 1st Channel  
V and thus lower stress on the input capacitor.  
IN  
To further maximize battery life, the P-channel MOSFETs  
are turned on continuously in dropout (100% duty cycle)  
and both channels draw a total quiescent current of only  
100μA. In shutdown, the device draws <1μA.  
n
n
Internal Soft-Start with Individual Run Pin Control  
Available in Small Thermally Enhanced  
(5mm × 3mm) DFN and 20-Lead TSSOP Packages  
APPLICATIONS  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents  
including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 6144194.  
n
GPS/Navigation Systems  
n
Automotive Instrumentation  
n
PC Cards  
n
Industrial Power Supplies  
n
General Purpose Point of Load DC/DC  
VOUT2 Efficiency  
TYPICAL APPLICATION  
(Burst Mode Operation)  
100  
95  
90  
85  
80  
75  
70  
10  
V
IN  
2.5V TO 5.5V  
REFER TO FIGURE 4  
10μF  
V
IN  
EFFICIENCY  
1
FREQ  
SW1  
1.5μH  
2.2μH  
V
V
2.5V  
1A  
OUT1  
1.8V  
1.5A  
OUT2  
SW2  
0.1  
22pF  
22pF  
RUN2  
V
IN  
RUN1  
V
IN  
LTC3417A-2  
0.01  
0.001  
0.0001  
511k  
412k  
866k  
412k  
V
FB2  
V
FB1  
POWER LOSS  
47μF  
22μF  
V
V
= 3.6V  
OUT  
FREQ = 1MHz  
I
IN  
I
TH2  
TH1  
= 2.5V  
5.9k  
2200pF  
2.87k  
GND  
0.001  
0.01  
0.1  
1
6800pF  
LOAD CURRENT (A)  
3417A-2 TA01  
3417A-2 TA01a  
3417a2fa  
1
1234567...20

中文翻译

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