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LTC3614

更新时间： 2024-11-22 14:58:03
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
30页 788K
描述
4A、4MHz、单片式同步降压型 DC/DC 转换器

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中文翻译

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LTC3614 数据手册

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LTC3614  
4A, 4MHz Monolithic  
Synchronous Step-Down  
DC/DC Converter  
DescripTion  
FeaTures  
The LTC®3614 is a low quiescent current monolithic syn-  
chronous buck regulator using a current mode, constant  
n
4A Output Current  
n
2.25V to 5.5V Input Voltage Range  
Low Output Ripple Burst Mode® Operation: I = 75µA frequency architecture. The no-load DC supply current  
n
Q
n
n
n
n
n
±±1 Output Voltage Accuracy  
in sleep mode is only 75µA while maintaining the output  
voltage (Burst Mode operation) at no load, dropping to  
zero current in shutdown. The 2.25V to 5.5V input supply  
voltage range makes the LTC3614 ideally suited for single  
Li-Ionaswellasfixedlowvoltageinputapplications.100%  
duty cycle capability provides low dropout operation,  
extending the operating timein battery-powered systems.  
Output Voltage Down to 0.6V  
High Efficiency: Up to 951  
Low Dropout Operation: 100% Duty Cycle  
Programmable Slew Rate on SW Node Reduces  
Noise and EMI  
n
n
Adjustable Switching Frequency: Up to 4MHz  
Optional Active Voltage Positioning (AVP) with  
Internal Compensation  
The operating frequency is externally programmable up to  
4MHz, allowing the use of small surface mount inductors.  
For switching-noise-sensitive applications, the LTC3614  
can be synchronized to an external clock at up to 4MHz.  
n
Selectable Pulse-Skipping/Forced Continuous/Burst  
Mode Operation with Adjustable Burst Clamp  
Programmable Soft-Start  
n
n
n
n
ForcedcontinuousmodeoperationintheLTC3614reduces  
noiseandRFinterference.Adjustablecompensationallows  
the transient response to be optimized over a wide range  
of loads and output capacitors.  
Inputs for Start-Up Tracking or External Reference  
DDR Memory Mode, I  
= 3A  
OUT  
Available in a 24-Pin 3mm × 5mm QFN  
Thermally Enhanced Package  
The internal synchronous switch increases efficiency and  
eliminates the need for an external catch diode, saving  
external components and board space. The LTC3614  
is offered in a leadless 24-pin 3mm × 5mm thermally  
enhanced QFN package.  
applicaTions  
n
Point-of-Load Supplies  
n
Distributed Power Supplies  
n
Portable Computer Systems  
n
DDR Memory Termination  
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.  
Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 6498466, 6611131.  
n
Handheld Devices  
Efficiency and Power Loss  
Typical applicaTion  
vs Load Current  
100  
V
IN  
2.7V TO 5.5V  
90  
10µF  
×4  
SV  
PV  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
IN  
IN  
RUN  
SRLIM/DDR  
TRACK/SS  
RT/SYNC  
0.1  
0.01  
0
330nH  
V
2.5V  
4A  
OUT  
LTC3614  
SW  
SGND  
PGND  
PGOOD  
ITH  
47µF  
×2  
MODE  
V
FB  
665k  
3614 TA01a  
V
V
V
= 2.8V  
= 3.3V  
= 5V  
IN  
IN  
IN  
210k  
V
= 2.5V  
10  
OUT  
1
100  
1000  
10000  
OUTPUT CURRENT (mA)  
3614 TA01b  
3614fc  
1
For more information www.linear.com/LTC3614  
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