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LTC3425

更新时间： 2023-12-20 18:44:40
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
24页 277K
描述
5A、8MHz、四相同步升压型 DC/DC 转换器

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中文翻译

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LTC3425 数据手册

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LTC3425  
5A, 8MHz, 4-Phase  
Synchronous Step-Up  
DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
■
High Efficiency: Up to 95%  
The LTC®3425 is a synchronous, 4-phase boost converter  
with output disconnect capable of operation below 1V  
input. It includes four N-channel MOSFET switches and  
four P-channel synchronous rectifiers for an effective  
RDS(ON) of 0.045Ω and 0.05Ω, respectively. 4-phase  
operation greatly reduces peak inductor currents, and  
capacitor ripple current, and increases effective switching  
frequency, minimizing inductor and capacitor sizes. True  
output disconnect eliminates inrush current and allows  
zero load current in shutdown. External Schottky diodes  
arenotrequiredinmostapplications(VOUT <4.3V).Power  
saving Burst Mode operation can be user controlled or left  
in automatic mode.  
■
Up to 3A Continuous Output Current  
■
4-Phase Operation for Low Output Ripple  
and Tiny Solution Size  
■
Output Disconnect and Inrush Current Limiting  
■
Very Low Quiescent Current: 12µA  
0.5V to 4.5V Input Range  
■
■
2.4V to 5.25V Adjustable Output Voltage  
■
Adjustable Current Limit  
■
Adjustable, Fixed Frequency Operation from  
100kHz to 2MHz per Phase  
■
Synchronizable Oscillator with Sync Output  
■
Internal Synchronous Rectifiers  
Manual or Automatic Burst Mode® Operation  
■
Other features include 1µA shutdown current, program-  
mable frequency with sync in and out, programmable  
soft-start, antiringing control, thermal shutdown, adjust-  
able current limit, reference output and power good  
comparator.  
■
Power Good Comparator  
■
<1µA Shutdown Current  
■
Antiringing Control  
■
5mm × 5mm Thermally Enhanced QFN Package  
U
APPLICATIO S  
The LTC3425 is available in a small, thermally enhanced  
32-pin QFN package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
■
Handheld Computers  
■
Point-of-Load Regulators  
■
3.3V to 5V Conversion  
U
TYPICAL APPLICATIO  
V
IN  
2V TO 3V  
2.2µF  
2.7µH 2.7µH 2.7µH 2.7µH  
100  
90  
V
SWA  
SWB  
LTC3425  
GNDB  
SWC  
SWD  
IN  
V
V
V
V
V
OUTS  
OUTA  
OUTB  
OUTC  
SHDN  
OFF ON  
80  
Burst Mode FIXED  
REFOUT  
CCM  
OPERATION FREQUENCY  
MODE  
70  
60  
50  
40  
30  
20  
10  
0
V
3.3V  
2A  
OUT  
OUTD  
4.7µF  
×4  
REFEN  
SYNCIN  
BURST  
1M  
10k  
22pF  
FB  
COMP  
SS  
SYNCOUT  
PGOOD  
V
V
= 2.4V  
IN  
OUT  
0.01µF  
R
T
590k  
330pF  
= 3.3V  
f = 1MHz/PHASE  
I
LIM  
SGND  
15k  
75k  
L = 2.7µH  
33k  
GNDA  
GNDC GNDD  
0.1  
1
10  
100  
1000  
10000  
0.01µF  
20k  
LOAD CURRENT (mA)  
3425 TA01  
3425 TA02  
C
C
: TAIYO YUDEN JMK107BJ225MA  
OUT  
L1-L4: TDK RLF5018T-2R7M1R8  
IN  
: TAIYO YUDEN JMK212BJ475MG (×4)  
3425f  
1
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中文翻译

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