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LT8609BEMSE#PBF

更新时间： 2024-09-19 21:20:27
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亚德诺 - ADI /
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LT8609BEMSE#PBF

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LT8609BEMSE#PBF 数据手册

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LT8609/LT8609A/LT8609B  
42V, 2A/3A Peak  
Synchronous Step-Down Regulator  
with 2.5µA Quiescent Current  
FEATURES  
DESCRIPTION  
The LT®8609/LT8609A/LT8609B is a compact, high ef-  
n
Wide Input Voltage Range: 3.0V to 42V  
Ultralow Quiescent Current Burst Mode® Operation:  
ficiency, high speed synchronous monolithic step-down  
switching regulator that consumes only 1.7µA of non-  
switchingquiescentcurrent.TheLT8609/LT8609A/LT8609B  
can deliver 2A of continuous current with peak loads of  
3A (<1sec). Burst Mode operation enables high efficiency  
down to very low output currents while keeping the output  
n
n
<2.5µA I Regulating 12V to 3.3V  
Q
IN  
OUT  
n
Output Ripple <10mV  
P-P  
n
n
High Efficiency 2MHz Synchronous Operation:  
n
>93% Efficiency at 1A, 5V  
from 12V  
OUT  
IN  
2A Maximum Continuous Output, 3A Peak  
Transient Output  
ripplebelow10mV .ASYNCpinallowssynchronizationto  
P-P  
n
n
n
n
n
n
n
n
n
n
Fast Minimum Switch-On Time: 45ns  
Adjustable and Synchronizable: 200kHz to 2.2MHz  
Spread Spectrum Frequency Modulation for Low EMI  
Allows Use of Small Inductors  
Low Dropout  
anexternalclock,orspreadspectrummodulationforlowEMI  
operation. Internal compensation with peak current mode  
topologyallowstheuseofsmallinductorsandresultsinfast  
transient response and good loop stability. The EN/UV pin  
has an accurate 1V threshold and can be used to program  
Peak Current Mode Operation  
V UVLOortoshutdownthepart.AcapacitorontheTR/SS  
IN  
Accurate 1V Enable Pin Threshold  
Internal Compensation  
Output Soft-Start and Tracking  
Small 10-Lead MSOP Package  
pin programs the output voltage ramp rate during start-up  
while the PG flag signals when V  
is within 8.5% of the  
OUT  
programmed output voltage as well as fault conditions. The  
LT8609AhasslowerswitchedgesforlowerEMIemissions.  
The LT8609B operates in pulse-skipping mode only.  
APPLICATIONS  
PULSE-SKIPPING MODE,  
n
GSM Transceivers  
Burst Mode OPERATION  
SWITCH EDGE SPEED  
n
General Purpose Step-Down  
Low EMI Step-Down  
LT8609  
Both  
Both  
Fast  
Medium  
Fast  
n
LT8609A  
LT8609B  
All registered trademarks and trademarks are the property of their respective owners.  
Pulse-Skipping  
TYPICAL APPLICATION  
12VIN to 5VOUT Efficiency  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
5V, 2MHz Step-Down  
V
IN  
5.5V TO 40V  
V
BST  
SW  
IN  
4.7µF  
0.1µF  
ON OFF  
EN/UV  
SYNC  
2.2µH  
V
5V  
2A  
OUT  
10pF  
LT8609  
INTV  
CC  
PG  
FB  
TR/SS  
RT  
1M  
1µF 18.2k  
187k  
22µF  
GND  
8609 TA01a  
f
= 2MHz  
SW  
0
0.50  
1.00  
1.50  
(A)  
2.00  
2.50  
I
OUT  
8609 TA01b  
8609ff  
1
For more information www.linear.com/LT8609  
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