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LT3640EFEPBF

更新时间： 2024-02-08 10:19:06
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
24页 566K
描述
Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer

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中文翻译

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LT3640EFEPBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：QFN包装说明：HVQCCN, LCC28,.16X.2,20
针数：28Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.17其他特性：PFM CONTROL TECHNIQUE ALSO POSSIBLE
模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：30 V
最小输入电压：5 V标称输入电压：12 V
JESD-30 代码：R-PQCC-N28JESD-609代码：e3
长度：5 mm湿度敏感等级：1
功能数量：1端子数量：28
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：3.4 A封装主体材料：PLASTIC/EPOXY
封装代码：HVQCCN封装等效代码：LCC28,.16X.2,20
封装形状：RECTANGULAR封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：0.8 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：PHASE-SHIFT
最大切换频率：2350 kHz技术：BIPOLAR
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：NO LEAD端子节距：0.5 mm
端子位置：QUAD处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：4 mmBase Number Matches：1

LT3640EFEPBF 数据手册

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Electrical Specifications Subject to Change  
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 36V 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  
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 36V; a 38V 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  
n
n
Programmable Window Mode Watchdog Timer  
n
Quiescent Current: 275μA  
n
Short-Circuit Robust  
n
Programmable Soft-Start  
n
Low Shutdown Current: I < 1μA  
Q
n
Available in Thermally Enhanced 28-Lead  
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 34V  
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
IN2  
= 3.3V  
SYNC  
PGOOD  
WDE  
22μF  
DA  
FB1  
V
IN  
= 12V  
49.9k  
10μF  
V
OUT1  
100k  
100k  
μP  
LT3640  
V
IN2  
RST1  
RST2  
WDO  
WDI  
EN2  
1μH  
V
OUT2  
SW2  
1.8V/0.8A  
100k  
47μF  
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  
3640p  
1
1234567...24

中文翻译

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