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LTC1772B_1

更新时间： 2024-11-19 05:43:43
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 218K
描述
Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

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LTC1772B_1 数据手册

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LTC1772B  
Constant Frequency  
Current Mode Step-Down  
DC/DC Controller in SOT-23  
FEATURES  
DESCRIPTION  
Burst Mode® Operation Disabled for Lower Output  
The LTC®1772B is a constant frequency current mode  
step-down DC/DC controller providing excellent AC and  
DC load and line regulation. The device incorporates an  
accurateundervoltagelockoutfeaturethatshutsdownthe  
LTC1772B when the input voltage falls below 2.0V.  
n
Ripple at Light Loads  
n
High Efficiency: Up to 94%  
n
High Output Currents Easily Achieved  
n
Wide V Range: 2.5V to 9.8V  
IN  
n
n
n
n
Constant Frequency 550kHz Operation  
Low Dropout: 100% Duty Cycle  
The LTC1772B provides a 2.5% output voltage accuracy  
and consumes only 270μA of quiescent current. In shut-  
down, the device draws a mere 8μA.  
Output Voltage Down to 0.8V  
Current Mode Operation for Excellent Line and Load  
Transient Response  
Shutdown Mode Draws Only 8µA Supply Current  
Tiny 6-Lead TSOT-23 Package  
To further maximize the life of a battery source, the  
external P-channel MOSFET is turned on continuously  
in dropout (100% duty cycle). High constant operating  
frequency of 550kHz allows the use of a small external  
inductor.  
n
n
APPLICATIONS  
The LTC1772B is available in a small footprint 6-lead  
TSOT-23.  
n
One or Two Lithium-Ion-Powered Applications  
n
Cellular Telephones  
For a Burst Mode operation enabled version of the  
LTC1772B, please refer to the LTC1772 data sheet.  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
Wireless Devices  
Portable Computers  
Distributed 3.3V, 2.5V or 1.8V Power Systems  
n
n
TYPICAL APPLICATION  
Efficiency vs Load Current*  
100  
V
IN  
2.5V  
LTC1772  
Burst Mode  
OPERATION  
C1  
10μF  
10V  
TO 9.8V  
R1  
0.03Ω  
95  
90  
85  
80  
75  
70  
65  
60  
1
6
L1  
4.7μH  
I
/RUN PGATE  
LTC1772B  
M1  
TH  
V
2.5V  
2A  
OUT  
10k  
220pF  
LTC1772B  
NON-Burst Mode  
OPERATION  
+
C2A  
47μF  
6V  
C2B  
1μF  
10V  
2
3
5
4
GND  
V
D1  
IN  
–
174k  
V
SENSE  
FB  
C1: TAIYO YUDEN LMK325BJ106K-T  
C2A: SANYO 6TPA47M  
C2B: AVX 0805ZC105KAT1A  
D1: MOTOROLA MBRM120T3  
L1: MURATA LQN6C-4R7  
M1: FAIRCHILD FDC638P  
R1: IRC LRC-LR1206-01-R030F  
V
V
= 3.6V  
IN  
OUT  
80.6k  
= 2.5V  
10  
100  
1000  
10000  
LOAD CURRENT (mA)  
*OUTPUT RIPPLE WAVEFORMS FOR THE CIRCUIT  
OF FIGURE 1 APPEAR IN FIGURE 2.  
1772 F01a  
1772 F01b  
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator  
1772bfa  
1
1234567...16

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