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LTC3412AEUF#TRMPBF

更新时间： 2024-09-24 05:35:07
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凌特 - Linear /
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20页 444K
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Switching Regulator

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LTC3412A  
3A, 4MHz, Monolithic  
Synchronous  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
The LTC®3412A is a high efficiency monolithic synchro-  
nous, step-down DC/DC converter utilizing a constant  
frequency, current mode architecture. It operates from  
an input voltage range of 2.25ꢂ to 5.5ꢂ and provides a  
regulated output voltage from 0.8ꢂ to 5ꢂ while deliver-  
ing up to 3A of output current. The internal synchronous  
powerswitchwith77mΩon-resistanceincreasesefficiency  
and eliminates the need for an external Schottky diode.  
Switching frequency is set by an external resistor or can  
be synchronized to an external clock. 100ꢀ duty cycle  
provides low dropout operation extending battery life in  
portable systems. ꢁPTI-LꢁꢁP® compensation allows the  
transient response to be optimized over a wide range of  
loads and output capacitors.  
n
ꢀ High Efficiency: Up to 95%  
n
ꢀ 3A Output Current  
n
ꢀ Low Quiescent Current: 64µA  
n
ꢀ Low R  
Internal Switch: 77mΩ  
DS(ON)  
n
n
n
n
n
ꢀ 2.25V to 5.5V Input Voltage Range  
ꢀ Programmable Frequency: 300kHz to 4MHz  
ꢀ 2ꢀ ꢁutput ꢂoltage Accuracy  
ꢀ 0.8ꢂ Reference Allows Low ꢁutput ꢂoltage  
®
ꢀ Selectable Forced Continuous/Burst Mode ꢁperation  
with Adjustable Burst Clamp  
n
n
n
n
n
ꢀ Synchronizable Switching Frequency  
ꢀ Low Dropout ꢁperation: 100ꢀ Duty Cycle  
ꢀ Power Good ꢁutput ꢂoltage Monitor  
ꢀ ꢁvertemperature Protected  
ꢀ Available in 16-Lead Exposed Pad TSSꢁP and  
QFN Packages  
The LTC3412A can be configured for either Burst Mode  
operationorforcedcontinuousoperation.Forcedcontinu-  
ous operation reduces noise and RF interference while  
BurstModeoperationprovideshighefficiencybyreducing  
gate charge losses at light loads. In Burst Mode operation,  
external control of the burst clamp level allows the output  
voltage ripple to be adjusted according to the application  
requirements.  
APPLICATIONS  
n
ꢀ Point-of-Load Regulation  
n
ꢀ Notebook Computers  
n
ꢀ Portable Instruments  
n
ꢀ Distributed Power Systems  
L, LT, LTC, LTM, Burst Mode, ꢁPTI-LꢁꢁP, Linear Technology and the Linear logo are registered  
trademarks and ThinSꢁT is a trademark of Analog Devices, Inc. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 5481178, 6580258,  
6304066, 6127815, 6498466, 6611131, 6724174.  
TYPICAL APPLICATION  
22µF  
V
Efficiency and Power Loss  
IN  
3.3V  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
100000  
10000  
1000  
100  
PV SV  
IN  
IN  
EFFICIENCY  
RT  
2.2M  
PGOOD  
LTC3412A  
0.47µH  
294k  
V
OUT  
SW  
2.5V AT 3A  
OUT  
C
RUN/SS  
PGND  
SGND  
100µF  
×2  
12.1k  
1000pF  
I
TH  
SYNC/MODE  
V
FB  
POWER LOSS  
820pF  
10  
69.8k  
392k  
115k  
3412A F01a  
1
0.01  
0.1  
1
10  
LOAD CURRENT (A)  
3412A F01b  
Figure 1. 2.5V/3A Step-Down Regulator  
3412aff  
1
For more information www.linear.com/LTC3412A  
1234567...20

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