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LTC3633EUFD PDF预览

LTC3633EUFD

更新时间： 2024-11-19 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
28页 383K
描述
Dual Channel 3A, 15V Monolithic Synchronous Step-Down Regulator

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LTC3633EUFD 数据手册

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LTC3633  
Dual Channel 3A, 15V  
Monolithic Synchronous  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
TheLTC®3633isahighefficiency,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,  
which relaxes the requirements for input and output ca-  
pacitance.Theoperatingsupplyvoltagerangeisfrom3.6V  
to 15V, making it suitable for dual cell lithium-ion batteries  
as well as point of load power supply applications from  
a 12V or 5V supply.  
n
3.6V to 15V 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  
n
0.6V Reference Allows Low Output Voltages  
Theoperatingfrequencyisprogrammableandsynchroniz-  
able from 500kHz to 4MHz with an external resistor. The  
high frequency capability 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 applications that operate at high  
frequency while demanding fast transient response. An  
internal phase lock loop servos the on-time of the internal  
one-shottimertomatchthefrequencyoftheinternalclock  
or an applied external clock.  
User Selectable Burst Mode® Operation or Forced  
n
Continuous Operation  
n
Output Voltage Tracking and Soft-Start Capability  
n
Short-Circuit Protected  
n
Overvoltage Input and Overtemperature Protection  
n
Low Power 2.5V Linear Regulator Output  
n
Power Good Status Outputs  
n
Available in (4mm × 5mm) QFN-28 and 28-Lead  
TSSOP Packages  
The LTC3633 can select between forced continuous mode  
and high efficiency Burst Mode operation.  
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  
Battery Powered Instruments  
n
n
Point of Load Power Supplies  
TYPICAL APPLICATION  
V
IN  
Efficiency vs Load Current  
3.6V TO 15V  
100  
47μF  
V
V
IN1  
IN2  
Burst Mode  
RUN1  
RUN2  
INTV  
CC  
x2  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
OPERATION  
ITH1  
ITH2  
RT  
2.2μF  
LTC3633  
MODE/SYNC  
PHMODE  
V2P5  
TRACKSS1  
PGOOD1  
BOOST1  
TRACKSS2  
PGOOD2  
BOOST2  
0.1μF  
0.1μF  
1.5μH  
1μH  
V
OUT  
V
OUT  
= 5V  
= 3.3V  
V
V
OUT2  
5V AT 3A  
OUT1  
3.3V AT 3A  
SW2  
SW1  
V
IN  
= 12V  
V
ON2  
V
ON1  
1
10  
100  
1000  
10000  
V
FB2  
V
FB1  
LOAD CURRENT (mA)  
SGND PGND  
73.2k  
45.3k  
10k  
10k  
22μF  
22μF  
3633 TA01b  
3633 TA01a  
3633f  
1
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