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LT3640

更新时间： 2023-12-20 18:44:38
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
24页 510K
描述
具上电复位和看门狗定时器的双通道、单片式、降压型稳压器

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中文翻译

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LT3640 数据手册

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LT3640  
Dual Monolithic Buck  
Regulator with Power-On  
Reset and Watchdog Timer  
FeaTures  
DescripTion  
The LT®3640 is a dual channel, current mode monolithic  
buck switching regulator with a power-on reset and a  
watchdog timer. Both regulators are synchronized to a  
single oscillator with an adjustable frequency (350kHz to  
2.5MHz). At light loads, both regulators operate in low  
ripple Burst Mode® to maintain high efficiency and low  
output ripple.  
n
High Voltage Buck Regulator:  
4V to 35V Operating Range  
1.3A Output Current  
n
OVLO Protects Input to 55V  
n
Low Voltage Synchronous Buck Regulator:  
2.5V to 5.5V Input Voltage Range  
1.1A Output Current  
n
Synchronizable, Adjustable 350kHz to 2.5MHz  
The high voltage channel is a nonsynchronous buck with  
an internal 2.4A top switch that operates from an input  
of 4V to 35V; a 36.5V OVLO protects the device to 55V.  
The low voltage channel operates from an input of 2.5V to  
5.5V. Internal synchronous power switches provide high  
efficiency without the need of external Schottky diode.  
Bothchannelshavecycle-by-cyclecurrentlimit,providing  
protection against shorted outputs.  
Switching Frequency  
Programmable Power-On Reset Timer  
Programmable Window Mode Watchdog Timer  
Typical Quiescent Current: 290µA  
n
n
n
n
Short-Circuit Robust  
Programmable Soft-Start  
Low Shutdown Current: I < 1µA  
Available in Thermally Enhanced 28-Lead  
n
n
Q
n
The power-on reset and watchdog timeout periods are  
both adjustable using external capacitors. The window  
mode watchdog timer flags when the µP pulses group  
too close together or too far apart.  
(4mm × 5mm) QFN and 28-Lead TSSOP Packages  
applicaTions  
n
Industrial Power Supplies  
Automotive Electronic Control Units  
The LT3640 is available in a 28-pin 4mm × 5mm QFN  
package and 28-pin TSSOP package. Both packages have  
an exposed pad for low thermal resistance.  
n
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
Typical applicaTion  
2MHz 3.3V/0.8A and 1.8V/0.8A Step Down Regulators  
HV Channel Efficiency,  
2MHz, VOUT1 = 3.3V  
LV Channel Efficiency,  
2MHz, VOUT2 = 1.8V  
0.22µF  
V
IN  
5V TO 35V  
10µF  
3.3µH  
80.6k  
90  
85  
80  
75  
70  
90  
85  
80  
75  
70  
V
OUT1  
EN/UVLO  
V
SW  
BST SW1  
IN  
3.3V/0.8A  
V
= 3.3V  
IN2  
SYNC  
WDE  
PGOOD  
22µF  
DA  
FB1  
V
= 12V  
IN  
49.9k  
V
OUT1  
100k  
µP  
100k  
LT3640  
V
IN2  
RST1  
RST2  
WDO  
WDI  
EN2  
1µH  
V
OUT2  
SW2  
1.8V/0.8A  
100k  
22µF  
CWDT  
CPOR  
FB2  
RT GND SS2 SS1  
49.9k  
0
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
0
0.2  
0.4  
0.6  
0.8  
1
1nF  
1.5nF  
1.5nF  
32.4k  
V
CURRENT (A)  
V
OUT2  
CURRENT (A)  
OUT1  
1nF  
3640 TA01b  
3640 TA01c  
3640 TA01a  
3640f  
ꢀ
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