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LT3626

更新时间： 2024-09-24 12:25:43
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
28页 627K
描述
Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator

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LT3626 数据手册

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LTC3633A/LTC3633A-1  
Dual Channel 3A, 20V  
Monolithic Synchronous  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
TheLTC®3633Aisahighefficiency,dual-channelmonolithic  
synchronous buck regulator using a controlled on-time,  
current mode architecture, with phase lockable switching  
frequency. The two channels can run 180° out of phase to  
relaxtherequirementsforinputandoutputcapacitance.The  
operatingsupplyvoltagerangeisfrom3.6Vto20V, making  
it suitable for lithium-ion battery stacks as well as point of  
load power supply applications from a 12V or 5V supply.  
n
3.6V to 20V Input Voltage Range  
n
3A Output Current per Channel  
n
Up to 95% Efficiency  
n
Low Duty Cycle Operation: 5% at 2.25MHz  
n
Selectable 0°/180° Phase Shift Between Channels  
n
Adjustable Switching Frequency: 500kHz to 4MHz  
n
External Frequency Synchronization  
n
Current Mode Operation for Excellent Line and  
Load Transient Response  
Theoperatingfrequencyisprogrammablefrom500kHzto  
4MHz with an external resistor and may be synchronized  
to an external clock signal. The high frequency capabil-  
ity allows the use of small surface mount inductors and  
capacitors. The unique constant frequency/controlled on-  
time architecture is ideal for high step-down ratio applica-  
tions that operate at high frequency while demanding fast  
transient response. An internal phase locked loop servos  
the on-time of the internal one-shot timer to match the  
frequencyoftheinternalclockoranappliedexternalclock.  
n
0.6V Reference Allows Low Output Voltages  
User Selectable Burst Mode® Operation or Forced  
n
Continuous Mode Operation  
n
Output Voltage Tracking and Soft-Start Capability  
n
Short-Circuit Protected  
n
Overvoltage Input and Overtemperature Protection  
n
Power Good Status Outputs  
LTC3633: 16V Absolute Maximum V  
n
IN  
IN  
n
LTC3633A: 20V Absolute Maximum V , Pin Compatible  
with LTC3633  
Low Profile (4mm × 5mm) QFN-28 and 28-Lead  
TSSOP Packages  
n
TheLTC3633Acanselectbetweenforcedcontinuousmode  
and high efficiency Burst Mode operation. The LTC3633A  
and LTC3633A-1 differ in their output voltage sense range  
(refer to Table 1 in the Operation section for a description  
of the entire LTC3633A product family).  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589,  
6774611.  
APPLICATIONS  
n
Distributed Power Systems  
n
Battery Powered Instruments  
n
Point of Load Power Supplies  
TYPICAL APPLICATION  
Efficiency vs Load Current  
V
IN  
6V TO 20V  
100  
47μF  
x2  
Burst Mode  
OPERATION  
V
IN2  
V
IN1  
RUN1  
RUN2  
INTV  
CC  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
ITH1  
ITH2  
RT  
2.2μF  
LTC3633A  
MODE/SYNC  
PHMODE  
V2P5  
TRACKSS2  
PGOOD2  
BOOST2  
TRACKSS1  
PGOOD1  
BOOST1  
1.5μH  
1μH  
0.1μF  
0.1μF  
V
V
OUT1  
V
OUT  
V
OUT  
= 5V  
= 3.3V  
OUT2  
5V AT 3A  
SW2  
SW1  
3.3V AT 3A  
V
IN  
= 12V  
V
V
V
ON1  
ON2  
0.001  
0.01  
0.1  
1
10  
V
FB1  
FB2  
SGND PGND  
LOAD CURRENT (A)  
73.2k  
45.3k  
10k  
22μF  
10k  
22μF  
3633a TA01b  
3633a TA01a  
3633a1f  
1
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