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LTC3417A PDF预览

LTC3417A

更新时间： 2024-09-23 04:43:39
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 1109K
描述
Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator

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中文翻译

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LTC3417A 数据手册

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LTC3417A  
Dual Synchronous  
1.5A/1A 4MHz  
Step-Down DC/DC Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®3417A 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  
voltage range and has a constant programmable switch-  
ingfrequency, allowingtheuseoftiny, lowcostcapacitors  
and inductors 2mm or less in height. Each output voltage  
is adjustable from 0.8V to 5V. Internal, synchronous, low  
RDS(ON) power switches provide high efficiency without  
the need for external Schottky diodes.  
■
High Efficiency: Up to 95%  
■
1.5A/1A Guaranteed Minimum Output Current  
■
Synchronizable to External Clock  
■
No Schottky Diodes Required  
■
Programmable Frequency Operation: 1.5MHz or  
Adjustable From 0.6MHz to 4MHz  
■
Low RDS(ON) Internal Switches  
■
Short-Circuit Protected  
■
VIN: 2.25V to 5.5V  
■
Current Mode Operation for Excellent Line and Load  
A user selectable mode input allows the user to trade off  
ripple voltage for light load efficiency. Burst Mode® opera-  
tion provides high efficiency at light loads, while Pulse  
Skipmodeprovideslowripplenoiseatlightloads.Aphase  
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 VIN and  
thus a lower RMS derating on the input capacitor.  
Transient Response  
■
125µA Quiescent Current in Sleep Mode  
■
Ultralow Shutdown Current: IQ < 1µA  
■
Low Dropout Operation: 100% Duty Cycle  
■
Power Good Output  
■
Phase Pin Selects 2nd Channel Phase Relationship  
with Respect to 1st Channel  
■
Internal Soft-Start with Individual Run Pin Control  
■
Available in Small Thermally Enhanced  
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.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark 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  
(5mm × 3mm) DUFN and 20-Lead TSSOP Packages  
APPLICATIO S  
■
GPS/Navigation  
■
Digital Cameras  
■
PC Cards  
■
Wireless and DSL Modems  
■
General Purpose Point of Load DC/DC  
U
OUT2 Efficiency  
TYPICAL APPLICATIO  
(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  
511k  
22pF  
866k  
RUN2  
V
IN  
RUN1  
V
IN  
LTC3417A  
0.01  
0.001  
0.0001  
V
FB2  
V
FB1  
POWER LOSS  
47µF  
412k  
22µF  
412k  
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)  
3417 TA01  
3417 TA01a  
3417afa  
1
1234567...20

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与LTC3417A相关器件

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LTC3417AEDHC-1-PBF Linear

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