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LTC3622-23_15 PDF预览

LTC3622-23_15

更新时间： 2024-11-22 01:15:27
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 593K
描述
17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current

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LTC3622-23_15 数据手册

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LTC3622/  
LTC3622-2/LTC3622-23/5  
17V, Dual 1A  
Synchronous Step-Down Regulator  
with Ultralow Quiescent Current  
DescripTion  
FeaTures  
TheLTC®3622isadual1Aoutput,highefficiencysynchro-  
nousmonolithicstep-downregulatorcapableofoperating  
from input supplies up to 17V. The switching frequency is  
fixed to 1MHz or 2.25MHz with a 5ꢀ0 synchronization  
range to an external clock. The regulator features ultralow  
quiescent current and high efficiency over a wide output  
voltage range.  
n
Dual Step-Down Outputs: 1A Per Channel  
n
n
n
n
Wide V Range: 2.7V to 17V  
IN  
Wide V  
Range: 0.6V to V  
OUT  
IN  
Up to 95% Efficiency  
No-Load I = 5µA with Both Channels Enabled;  
Q
I < 4µA with Only One Channel Enabled  
Q
n
n
High Efficiency, Low Dropout Operation  
(100% Duty Cycle)  
The step-down regulators operate from an input voltage  
range of 2.7V to 17V and provide an adjustable output  
Constant Frequency (1MHz/2.25MHz) with External  
Frequency Synchronization  
from ꢀ.6V to V while delivering up to 1A of output cur-  
IN  
n
n
10 Output Voltage Accuracy  
rent. A user-selectable mode input is provided to allow  
the user to trade off ripple noise for light load efficiency.  
Burst Mode® operation provides the highest efficiency at  
lightloads,whilepulse-skippingmodeprovidesthelowest  
ripplenoise.Theswitchingregulatorscanbesynchronized  
Current Mode Operation for Excellent Line and Load  
Transient Response  
Phase Shift Programmable with External Clock  
Selectable Current Limit  
Internal Compensation and Soft-Start  
Compact 14-Pin DFN (3mm × 4mm) and 16-Lead  
MSOP Packages  
n
n
n
n
to an external clock. Furthermore, fixed V  
options are  
OUT  
available to eliminate the external feedback resistors.  
List of LTC3622 Options  
PART NAME  
LTC3622  
FREQUENCY  
1.ꢀꢀMHz  
V
OUT  
applicaTions  
Adjustable  
Adjustable  
5V/3.3V  
n
LTC3622-2  
LTC3622-23/5  
2.25MHz  
Battery Powered Systems  
Point-of-Load Supplies  
n
2.25MHZ  
n
Portable – Handheld Scanners  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents, including 5481178, 658ꢀ258,  
6498466, 6611131, 57ꢀ5919.  
Typical applicaTion  
Efficiency vs Load Current  
2.5V/5V VOUT Application, fSW = 1MHz  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
V
IN  
V
V
INTV  
IN1  
CC  
5.5V TO 17V  
IN2 MODE/SYNC  
C
C1  
IN  
RUN1  
RUN2  
10µF  
1µF  
PHASE  
I
LIM  
LTC3622  
GND  
V
4.7µH  
619k  
6.8µH  
V
OUT2  
5V  
1A  
V
V
= 2.5V  
= 5V  
OUT1  
2.5V  
1A  
OUT1  
OUT2  
SW1  
FB1  
SW2  
FB2  
V
SW  
= 12V  
= 1MHz  
BURST MODE OPERATION  
IN  
619k  
22pF  
22pF  
f
C
22µF  
C
OUT2  
22µF  
OUT1  
196k  
84.5k  
0.0001  
0.001  
0.01  
0.1  
1
LOAD CURRENT (A)  
3622 TA01b  
3622 TA01  
3622fa  
1
For more information www.linear.com/LTC3622  
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