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LTC3620

更新时间： 2024-11-22 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
18页 322K
描述
超低功率、15mA、同步降压型开关稳压器

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中文翻译

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LTC3620 数据手册

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LTC3620  
Ultralow Power 15mA  
Synchronous Step-Down  
Switching Regulator  
DESCRIPTION  
FEATURES  
The LTC®3620 is a high efficiency, synchronous buck  
regulator, suitable for very low power, very small footprint  
applications powered by a single Li-Ion battery.  
n
High Efficiency: Up to 95%  
n
Maximum Current Output: 15mA  
n
Externally Programmable Frequency Clamp with  
Internal 50kHz Default Minimizes Audio Noise  
The internal synchronous switches increase efficiency  
and eliminate the need for external Schottky diodes. Low  
output voltages are easily supported by the 0.6V feedback  
reference voltage. The LTC3620-1 option is internally  
programmed to provide a 1.1V output.  
n
18μA I Current  
Q
n
n
n
n
n
n
n
n
n
n
2.9V to 5.5V Input Voltage Range  
Low-Battery Detection  
0.6V Reference Allows Low Output Voltages  
Shutdown Mode Draws <1μA Supply Current  
2.8V Undervoltage Lockout  
TheLTC3620usesauniquevariablefrequencyarchitecture  
to minimize power loss and achieve high efficiency. The  
switchingfrequencyisproportionaltotheloadcurrent,and  
an internal frequency clamp forces a minimum switching  
frequency at light loads to minimize noise in the audio  
range. The user can program the frequency of this clamp  
by applying an external clock to the FMIN/MODE pin.  
Unique Low Noise Control Architecture  
Internal Power MOSFETs  
No Schottky Diodes Required  
Internal Soft-Start  
Tiny 2mm × 2mm 8-Lead DFN Package  
The battery status output, LOBATB, indicates when the  
input voltage drops below 3V. To help prevent damage to  
the battery, an undervoltage lockout (UVLO) circuit shuts  
down the part if the input voltage falls below 2.8V.  
APPLICATIONS  
n
Hearing Aids  
n
Wireless Headsets  
n
Li-Ion Cell Applications  
The LTC3620 is available in a low profile, 2mm × 2mm  
8-lead DFN package.  
n
Button Cell Replacement  
L, LT, LTC, LTM, 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 7528587.  
TYPICAL APPLICATION  
Output Voltage Ripple  
vs Load Current  
High Efficiency Low Power  
Step-Down Converter  
25  
Efficiency vs Load Current  
100  
90  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
V
= 1.1V  
OUT  
V
IN  
2.9V TO 5.5V  
FMIN/MODE = 0V  
L = 22μH  
EFFICIENCY  
80  
20  
15  
10  
5
V
IN  
70  
V
= 5.5V  
IN  
22μH  
22pF  
RUN  
LOBATB  
SW  
V
60  
50  
OUT  
1.1V  
LTC3620  
1μF  
CER  
V
= 3.6V  
IN  
V
= 3V  
IN  
FMIN/MODE = 0V  
40  
30  
20  
10  
0
FMIN/MODE V  
GND  
FB  
V
V
V
= 1.1V  
= 1.8V  
= 2.5V  
OUT  
OUT  
OUT  
432k  
523k  
1μF  
CER  
LOSS  
3620 TA01a  
0
0.1  
1
10  
0
5
10  
15  
3620 TA01c  
LOAD CURRENT (mA)  
OUTPUT CURRENT (mA)  
3620 TA01b  
3620fa  
1
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