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LT8609

更新时间： 2023-12-20 18:46:13
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
30页 1926K
描述
具有 2.5μA 静态电流的 42V、3A 同步降压型稳压器

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中文翻译

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LT8609 数据手册

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LT8609/LT8609A/LT8609B  
42V, 3A Synchronous Step-Down  
Regulator with 2.5µA Quiescent Current  
FEATURES  
DESCRIPTION  
n
Wide Input Voltage Range: 3.0V to 42V  
The LT®8609/LT8609A/LT8609B is a compact, high effi-  
ciency, high speed synchronous monolithic step-down  
switching regulator that consumes only 1.7µA of non-  
switching quiescent current. The LT8609/LT8609A/  
LT8609B can deliver 3A of continuous current. Burst Mode  
operation enables high efficiency down to very low output  
Ultralow Quiescent Current Burst Mode® Operation:  
n
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<2.5µA I Regulating 12V to 3.3V  
Q
IN  
OUT  
n
Output Ripple <10mV  
P-P  
n
High Efficiency 2MHz Synchronous Operation:  
n
>93% Efficiency at 1A, 5V  
from 12V  
OUT  
IN  
n
n
n
n
n
n
n
n
n
n
n
n
3A Maximum Continuous Output  
Fast Minimum Switch-On Time: 45ns  
currents while keeping the output ripple below 10mV  
.
P-P  
A SYNC pin allows synchronization to an external clock, or  
spread spectrum modulation for low EMI operation. Internal  
compensation with peak current mode topology allows the  
use of small inductors and results in fast transient response  
and good loop stability. The EN/UV pin has an accurate  
LT8609A Available in Fixed 3.3V and 5V Output  
Adjustable and Synchronizable: 200kHz to 2.2MHz  
Spread Spectrum Frequency Modulation for Low EMI  
Allows Use of Small Inductors  
Low Dropout  
Peak Current Mode Operation  
Accurate 1V Enable Pin Threshold  
Internal Compensation  
Output Soft-Start and Tracking  
1V threshold and can be used to program V UVLO or to  
IN  
shut down the part. A capacitor on the TR/SS pin programs  
the output voltage ramp rate during start-up while the PG  
flag signals when V  
is within 8.5% on the adjustable  
output parts or 7.O5U%T on the fixed output parts of the  
programmed output voltage as well as fault conditions.  
The LT8609A has slower switch edges for lower EMI emis-  
sions. The LT8609B operates in pulse-skipping mode only.  
Small 10-Lead MSOP Package, 16-Lead MSOP Pack-  
age, or 10-Lead 3mm × 3mm DFN Package with Side  
Wettable Flanks  
n
AEC-Q100 Qualified for Automotive Applications  
PULSE-SKIPPING MODE,  
Burst Mode OPERATION  
SWITCH EDGE SPEED  
APPLICATIONS  
LT8609  
Both  
Both  
Fast  
Medium  
Fast  
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GSM Transceivers  
LT8609A  
LT8609B  
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General Purpose Step-Down  
Pulse-Skipping  
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Low EMI Step-Down  
All registered trademarks and trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
12VIN to 5VOUT Efficiency  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
L = 2.2µH  
5V, 2MHz Step-Down  
f
= 2MHz  
SW  
V
IN  
V
BST  
IN  
6V TO 40V  
4.7µF  
0.1µF  
ON OFF  
EN/UV  
SYNC  
2.2µH  
V
5V  
3A  
OUT  
SW  
10pF  
LT8609A  
INTV  
CC  
PG  
FB  
TR/SS  
RT  
1M  
1µF 18.2k  
187k  
22µF  
GND  
8609 TA01a  
0.00 0.50 1.00 1.50 2.00 2.50  
(A)  
3
I
OUT  
8609 TA01b  
Rev. J  
1
Document Feedback  
For more information www.analog.com  
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