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LT3688EFEPBF

更新时间： 2024-01-12 15:15:31
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
28页 405K
描述
Dual 800mA Step-Down Switching Regulator with Power-On Reset

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LT3688EFEPBF 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active包装说明：HVQCCN,
针数：24Reach Compliance Code：compliant
风险等级：5.7模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：36 V最小输入电压：3.8 V
标称输入电压：12 VJESD-30 代码：S-PQCC-N24
JESD-609代码：e3长度：4 mm
功能数量：1端子数量：24
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：2.2 A封装主体材料：PLASTIC/EPOXY
封装代码：HVQCCN封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：NOT SPECIFIED
认证状态：Not Qualified座面最大高度：0.8 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：2350 kHz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 mm
Base Number Matches：1

LT3688EFEPBF 数据手册

 浏览型号LT3688EFEPBF的Datasheet PDF文件第2页浏览型号LT3688EFEPBF的Datasheet PDF文件第3页浏览型号LT3688EFEPBF的Datasheet PDF文件第4页浏览型号LT3688EFEPBF的Datasheet PDF文件第5页浏览型号LT3688EFEPBF的Datasheet PDF文件第6页浏览型号LT3688EFEPBF的Datasheet PDF文件第7页 
LT3688  
Dual 800mA Step-Down  
Switching Regulator with  
Power-On Reset and  
Watchdog Timer  
FEATURES  
DESCRIPTION  
The LT®3688 is an adjustable frequency (350kHz to  
2.2MHz) dual monolithic step-down switching regulator  
with two power-on reset timers and a watchdog timer.  
The regulator operates off inputs up to 36V. Low ripple  
Burst Mode® operation maintains high efficiency at low  
output current while keeping output ripple below 25mV in  
a typical application, with input quiescent current of just  
115μA. Shutdown circuitry reduces input supply current  
to less than 1μA while EN/UVLO is pulled low.  
n
Wide Input Range:  
Operation from 3.8V to 36V  
n
Low Ripple (<25mV ) Burst Mode Operation:  
P-P  
IN  
I = 115μA at 12V to 3.3V and 5V  
Q
n
n
Programmable, Defeatable Window Watchdog Timer  
Two Independently Programmable Power-On-Reset  
Timers  
n
n
n
n
Synchronizable, Adjustable 350kHz-2.2MHz  
Switching Frequency  
Two 800mA Output Switching Regulators with Internal  
Power Switches  
Programmable Input Undervoltage Lockout with  
Hysteresis  
Thermally Enhanced 24-Pin TSSOP and 4mm × 4mm  
QFN Packages  
The reset and watchdog timeout periods are both adjust-  
able using external capacitors. Tight accuracy specifica-  
tions and glitch immunity ensure reliable reset operation  
without false triggering. The open collector RST pins will  
pull down if the monitored output voltage drops 10%  
belowtheprogrammedvalue.TheLT3688watchdogtimer  
monitors for watchdog falling edges grouped too close  
together or too far apart.  
APPLICATIONS  
n
Automotive Electronic Control Units  
The LT3688 is available in 24-Pin TSSOP and 4mm ×  
4mm QFN packages, each with an exposed pad for low  
thermal resistance.  
n
Industrial Power Supplies  
n
High-Reliability ꢀProcessor Systems  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
TYPICAL APPLICATION  
5V and 3.3V Regulator with Power-On Reset and Watchdog Timers  
Efficiency  
V
90  
80  
70  
60  
50  
40  
30  
10000.0  
1000.0  
100.0  
10.0  
IN  
6V TO 36V  
V
V
= 12V  
IN  
OUT  
= 3.3V  
4.7ꢀF  
EN/UVLO  
BST1  
V
BIAS  
BST2  
IN  
L = 4.7ꢀH  
f = 800kHz  
18ꢀH  
0.22ꢀF  
0.22ꢀF 12ꢀH  
V
V
OUT1  
5V  
OUT2  
3.3V  
SW1  
SW2  
800mA  
800mA  
LT3688  
523k  
316k  
100k  
DA1  
FB1  
DA2  
FB2  
22pF  
22ꢀF  
22pF  
1nF  
1nF  
1.0  
100k  
22ꢀF  
RUN/SS2  
RUN/SS1  
0.1  
C
WDT  
ꢀP  
I/O  
I/O  
RESET  
WDI  
C
POR1  
1nF  
WDO  
RST1  
RST2  
0.01  
C
POR2  
RT  
0.0001  
0.001  
0.01  
0.1  
1
4.7nF  
4.7nF  
LOAD CURRENT (A)  
SYNC  
GND  
3688 TA01b  
110k  
3688 TA01a  
f
= 500kHz  
SW  
3688f  
1
1234567...28

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