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LT3689-5

更新时间： 2024-01-04 10:53:20
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
32页 388K
描述
700mA Step-Down Regulator with Power-On Reset and Watchdog Timer

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LT3689-5 数据手册

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LT3689/LT3689-5  
700mA Step-Down  
Regulator with Power-On Reset  
and Watchdog Timer  
FEATURES  
DESCRIPTION  
TheLT®3689isanadjustablefrequency(350kHzto2.2MHz)  
monolithicstep-downswitchingregulatorwithapower-on  
reset and watchdog timer. The regulator operates from  
inputs up to 36V and withstands transients up to 60V. Low  
ripple Burst Mode® operation maintains high efficiency at  
lowoutputcurrentwhilekeepingoutputripplebelow15mV  
in a typical application, with input quiescent current of just  
85μA. Shutdown circuitry reduces input supply current to  
less than 1μA while EN/UVLO is pulled low. Using a resis-  
tor divider on the EN/UVLO pin provides a programmable  
undervoltage lockout. Current limit, frequency foldback  
and thermal shutdown provide fault protection.  
n
Wide Input Range:  
Operation from 3.6V to 36V  
Overvoltage Lockout Protects Circuits through  
60V Transients  
n
85μA I at 12V to 3.3V  
Q
IN  
OUT  
Low Ripple Burst Mode® Operation Allows Output  
n
Ripple <15mV  
P-P  
n
Programmable, Defeatable Watchdog Timer with  
Window or Timeout Control  
n
n
Programmable Power-On Reset Timer (POR)  
Synchronizable, Adjustable 350kHz to 2.2MHz  
Switching Frequency  
700mA Output Switching Regulator with Internal  
Power Switch  
n
The reset and watchdog timeout periods are indepen-  
dentlyadjustableusingexternalcapacitors.Tightaccuracy  
specifications and glitch immunity ensure reliable reset  
operation of a system without false triggering. The open  
collector RST will pull down if output voltage drops 10%  
below the programmed value. The watchdog timer is  
pin-selectable for window or timeout modes. In timeout  
mode, WDO pulls low if too long of a period passes before  
a watchdog transition is detected. In window mode, the  
LT3689 monitors for WDI falling edges grouped too close  
together or too far apart.  
n
n
n
Fixed 5V or Adjustable Output Voltage  
800mV Feedback Voltage  
Programmable Input Undervoltage Lockout with  
Hysteresis  
16-Pin 3mm × 3mm QFN and 16-Pin MSOP Packages  
n
APPLICATIONS  
n
Automotive Electronic Control Units  
Industrial Power Supplies  
n
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.  
TYPICAL APPLICATION  
Efficiency  
3.3V Regulator with Power-On Reset Timer and Watchdog Timer  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
V
V
= 12V  
IN  
OUT  
V
IN  
= 3.3V  
4.5V TO 36V  
f = 700kHz  
L = 12μH  
2.2μF  
V
EN/UVLO  
LT3689  
TRANSIENT TO 60V  
OUT  
BST  
IN  
T
= 25°C  
A
0.1μF  
12μH  
10pF  
μP  
3.3V  
I/O  
WDI  
WDO  
RST  
SW  
700mA  
I/O  
RESET  
DA  
FB  
316k  
C
C
WDT  
POR  
C
WDT  
RT  
10nF  
= 182ms  
= 5.9ms  
22μF  
C
GND  
SYNC  
POR  
t
20.5k 100k  
WDU  
WDL  
68nF  
t
f
= 700kHz  
t
= 157ms  
SW  
RST  
1
3689 TA01  
0.0001  
0.001  
0.01  
0.1  
1
LOAD CURRENT (A)  
3689 TA01b  
3689fa  
1
1234567...32

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