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LTC3417A-1

更新时间： 2023-12-20 18:44:47
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 344K
描述
具有POR的双通道同步、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-1 数据手册

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LTC3417A-1  
Dual Synchronous  
1.5A/1A 4MHz Step-Down  
DC/DC Regulator with POR  
DESCRIPTION  
FEATURES  
The LTC®3417A-1 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
Power-On-Reset Output  
No Schottky Diodes Required  
n
n
Programmable Frequency Operation: 1.5MHz or  
Adjustable From 0.6MHz to 4MHz  
Low Ripple (< 35mV ) BurstMode® Operation  
n
R
power switches provide high efficiency without  
DS(ON)  
P-P  
n
the need for external Schottky diodes.  
Low R  
Internal Switches  
DS(ON)  
Short-Circuit Protected  
n
n
n
The open drain POR pin goes low when either output  
voltage falls 6% below regulation. The output will remain  
low 150ms longer than the duration of the out of regula-  
tion condition.  
V : 2.25V to 5.5V  
IN  
Current Mode Operation for Excellent Line and Load  
Transient Response  
n
n
n
n
125μA Quiescent Current in Sleep Mode  
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  
Ultralow Shutdown Current: I < 1μA  
Q
Low Dropout Operation: 100% Duty Cycle  
Phase Pin Selects 2nd Channel Phase Relationship  
with Respect to 1st Channel  
n
n
Internal Soft-Start with Individual Run Pin Control  
Available in Small Thermally Enhanced  
(3mm × 5mm) DFN and 20-Lead TSSOP Packages  
V and thus lower stress on the input capacitor.  
IN  
APPLICATIONS  
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.  
L, LT, LTC and 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  
Industrial Power Supplies  
General Purpose Point of Load DC/DC  
n
n
OUT2 Efficiency  
TYPICAL APPLICATION  
(Burst Mode Operation)  
V
100  
95  
90  
85  
80  
75  
70  
10  
IN  
REFER TO FIGURE 4  
2.5V TO 5.5V  
10μF  
100k  
V
IN  
1
RESET  
POR  
FREQ  
SW1  
EFFICIENCY  
1.5μH  
2.2μH  
V
V
2.5V  
1A  
OUT1  
1.8V  
1.5A  
OUT2  
SW2  
22pF  
511k  
22pF  
0.1  
RUN2  
V
RUN1  
V
IN  
IN  
LTC3417A-1  
866k  
0.01  
0.001  
0.0001  
V
FB2  
V
I
POWER LOSS  
FB1  
47μF  
412k  
5.9k  
22μF  
412k  
V
V
= 3.6V  
OUT  
FREQ = 1MHz  
I
IN  
TH2  
TH1  
= 2.5V  
2.87k  
6800pF  
GND  
0.001  
0.01  
0.1  
1
2200pF  
LOAD CURRENT (A)  
3417A-1 TA01  
3417A-1 TA01a  
3417a1fa  
1
1234567...20

中文翻译

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