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LTC1772B

更新时间： 2024-11-18 22:40:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
12页 190K
描述
Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

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中文翻译

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LTC1772B 数据手册

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LTC1772B  
Constant Frequency  
Current Mode Step-Down  
DC/DC Controller in SOT-23  
U
FEATURES  
■
DESCRIPTIO  
Burst ModeTM 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.  
Ripple at Light Loads  
■
High Efficiency: Up to 94%  
■
High Output Currents Easily Achieved  
■
Wide VIN Range: 2.5V to 9.8V  
■
Constant Frequency 550kHz Operation  
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.  
■
Low Dropout: 100% Duty Cycle  
■
Output Voltage down to 0.8V  
■
Current Mode Operation for Excellent Line and Load  
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.  
Transient Response  
■
■
Shutdown Mode Draws Only 8µA Supply Current  
Tiny 6-Lead SOT-23 Package  
U
APPLICATIO S  
The LTC1772B is available in a small footprint 6-lead  
SOT-23.  
■
One or Two Lithium-Ion-Powered Applications  
■
Cellular Telephones  
For a Burst Mode operation enabled version of the  
LTC1772B, please refer to the LTC1772 data sheet.  
■
Wireless Devices  
Portable Computers  
Distributed 3.3V, 2.5V or 1.8V Power Systems  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Efficiency vs Load Current*  
100  
V
IN  
LTC1772  
BURST MODE  
OPERATION  
2.5V  
95  
90  
85  
80  
75  
70  
65  
60  
C1  
10µF  
10V  
TO 9.8V  
R1  
0.03Ω  
1
6
L1  
4.7µH  
I
/RUN PGATE  
LTC1772B  
M1  
TH  
V
2.5V  
2A  
OUT  
LTC1772B  
NON-BURST MODE  
OPERATION  
10k  
220pF  
+
C2A  
47µF  
6V  
C2B  
1µF  
10V  
2
3
5
4
GND  
V
D1  
IN  
–
174k  
V
SENSE  
FB  
V
V
= 3.6V  
IN  
OUT  
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  
= 2.5V  
80.6k  
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  
1
1234567...12

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