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ZXTN25020DG PDF预览

ZXTN25020DG

更新时间： 2024-10-02 12:20:51
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 339K
描述
36V, 2.6A Monolithic Buck

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ZXTN25020DG 数据手册

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LT3694/LT3694-1  
36V, 2.6A Monolithic Buck  
Regulator With Dual LDO  
FEATURES  
DESCRIPTION  
The LT®3694/LT3694-1 are monolithic, current mode  
DC/DC converters with dual, low dropout regulator con-  
trollers. The switching converter is a step-down converter  
capable of generating up to 2.6A at its output. Each regu-  
lator has independent track/soft-start circuits simplifying  
power supply sequencing and interfacing with micro-  
controllers and DSPs.  
n
Wide Input Range: 4V to 36V  
n
Overvoltage Shutdown Protects Circuit Through  
70V Transients  
n
2.6A Output Switching Regulator with Internal  
Power Switch  
n
Dual, Low Dropout, Linear Regulator Controllers  
with Programmable Current Limit  
n
Tracking/Soft-Start Inputs and Power Good Output  
The switching frequency is set with a single resistor with a  
range of 250kHz to 2.5MHz. The high switching frequency  
permits the use of small inductors and ceramic capacitors  
leadingtoverysmalltripleoutputsolutions. Theconstant-  
switching frequency, combined with low impedance ce-  
ramic capacitors, results in low, predictable output ripple.  
Protectioncircuitrysensesthecurrentinthepowerswitch  
and external Schottky catch diode to protect the LT3694  
against short-circuit conditions. Frequency foldback and  
thermal shutdown provide additional protection.  
Simplify Soft-Start and Supply Sequencing  
n
Uses Small Inductors and Ceramic Capacitors  
n
V
= 0.75V (Buck and LDOs)  
OUT(MIN)  
n
n
Adjustable 250kHz to 2.5MHz Switching Frequency  
Accurate Enable Threshold Allows User  
Programmable Undervoltage Lockout  
n
n
Options for Clock Synchronization (LT3694) or Clock  
Output to Enable Synchronization to Other Switching  
Regulators (LT3694-1)  
Thermally Enhanced 28-Lead 4mm × 5mm QFN and  
20-Lead TSSOP Packages  
With its wide input voltage range of 4V to 36V, the LT3694  
regulatesabroadarrayofpowersourcesfrom4-cellbatteries  
and5Vlogicrailstounregulatedwalltransformers,leadacid  
batteriesanddistributedpowersupplies.TheLT3694canbe  
synchronized to an external clock with the SYNC pin while  
the LT3694-1 offers a CLKOUT pin allowing other DC/DC  
converters to synchronize to the LT3694-1 clock.  
APPLICATIONS  
n
Automotive  
n
Industrial  
n
DSL and Cable Modems  
n
Distributed Power Regulation  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective owners.  
n
Wall Transformer Regulation  
TYPICAL APPLICATION  
V
IN  
Efficiency at VOUT = 3.3V  
4.5V TO 36V  
4.7µF  
V
EN/UVLO  
BIAS BST  
IN  
100  
0.22µF  
B340A  
f
= 800kHz  
SW  
4.7µH  
OUT1  
3.3V  
1.7A  
TRK/SS1  
TRK/SS2  
TRK/SS3  
SW  
V
V
= 4.5V  
= 12V  
IN  
90  
80  
70  
60  
50  
1nF  
34k  
10k  
IN  
DA  
FB1  
0.1Ω  
47µF  
V
= 36V  
LT3694  
IN  
330pF  
OUT1  
LIM2  
DRV2  
41.2k  
V
C1  
OUT2  
2.5V  
450mA  
OUT1  
LIM3  
DRV3  
0.1Ω  
24.9k  
10.7k  
OUT3  
1.8V  
450mA  
2.2µF  
FB2  
SYNC  
15.4k  
2.2µF  
FB3  
PGOOD  
RT  
0
1
2
3
51.1k  
11k  
I
(A)  
OUT  
GND  
36941 TA01b  
f
= 800kHz  
SW  
36941 TA01a  
36941fb  
1
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