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LTC1772IS6#TRMPBF

更新时间： 2024-11-19 20:10:15
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
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12页 167K
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LTC1772IS6#TRMPBF 数据手册

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LTC1772  
Constant Frequency  
Current Mode Step-Down  
DC/DC Controller in SOT-23  
U
DESCRIPTIO  
FEATURES  
■
High Efficiency: Up to 94%  
The LTC®1772 is a constant frequency current mode step-  
downDC/DCcontrollerprovidingexcellentACandDCload  
and line regulation. The device incorporates an accurate  
undervoltagelockoutfeaturethatshutsdowntheLTC1772  
when the input voltage falls below 2.0V.  
■
High Output Currents Easily Achieved  
■
Wide VIN Range: 2.5V to 9.8V  
■
Constant Frequency 550kHz Operation  
Burst Mode® Operation at Light Load  
■
■
Low Dropout: 100% Duty Cycle  
Tiny 6-Lead SOT-23 Package  
0.8V Reference Allows Low Output Voltages  
The LTC1772 provides a ±2.5% output voltage accuracy  
and consumes only 270µA of quiescent current. For  
applications where efficiency is a prime consideration, the  
LTC1772 is configured for Burst Mode operation, which  
enhances efficiency at low output current.  
■
■
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
Low Quiescent Current: 270µA  
■
■
To further maximize the life of a battery source, the  
external P-channel MOSFET is turned on continuously in  
dropout (100%dutycycle).In shutdown, the device draws  
a mere 8µA. High constant operating frequency of 550kHz  
allows the use of a small external inductor.  
Shutdown Mode Draws Only 8µA Supply Current  
±2.5% Reference Accuracy  
U
APPLICATIO S  
■
One or Two Lithium-Ion-Powered Applications  
The LTC1772 is available in a small footprint 6-lead  
SOT-23.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Cellular Telephones  
■
Wireless Modems  
■
Portable Computers  
■
Distributed 3.3V, 2.5V or 1.8V Power Systems  
■
Scanners  
U
TYPICAL APPLICATIO  
V
Efficiency vs Load Current  
IN  
2.5V  
100  
90  
80  
70  
60  
50  
40  
C1  
TO 9.8V  
R1  
0.03Ω  
V
= 4.2V  
IN  
10µF  
V
= 3.3V  
IN  
10V  
1
6
L1  
4.7µH  
I
/RUN PGATE  
LTC1772  
M1  
TH  
V
2.5V  
2A  
OUT  
10k  
220pF  
V = 6V  
IN  
+
C2A  
47µF  
6V  
C2B  
1µF  
10V  
2
3
5
4
GND  
V
D1  
IN  
–
V
= 8.4V  
IN  
174k  
V
= 9.8V  
IN  
V
SENSE  
FB  
C1: TAIYO YUDEN LMK325BJ106K-T  
C2A: SANYO 6TPA47M  
C2B: AVX 0805ZC105KAT1A  
D1: MOTOROLA MBRM120T3  
L1: MURATA LQN6C-4R7  
80.6k  
V
= 2.5V  
OUT  
1
10  
100  
1000  
10000  
1772 F01a  
M1: FAIRCHILD FDC638P  
R1: IRC LRC-LR1206-01-R030F  
LOAD CURRENT (mA)  
1772 F01b  
1772fb  
1
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator  
1234567...12

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