LTC1696 Datasheet, PDF (1/12 Pages) Linear Technology – Overvoltage Protection Controller

FEATURES
s _{±2% Overvoltage Threshold Accuracy}
s _{Low Profile (1mm) ThinSOT}^TM _Package
s _{Gate Drive for SCR Crowbar or External N-Channel}
Disconnect MOSFET
s _{Monitors Two Output Voltages}
s _{Senses Output Voltages from 0.8V to 24V}
s _{Wide Supply Range: 2.7V to 27V}
s _{Multifunction TIMER/RESET Pin}
U
APPLICATIO S
s _{Telecommunication Systems}
s _{Computer Systems}
s _{Industrial Control Systems}
s _{Notebook Computers}
LTC1696
Overvoltage Protection
Controller
DESCRIPTIO
The LTC^®1696 is a standalone power supply overvoltage
monitor and protection device designed to protect a power
supply load in the event of an overvoltage fault. It monitors
two adjustable output voltages. If an overvoltage condi-
tion is detected, the output drives either an external SCR
crowbar or turns off external back-to-back N-channel
MOSFETs, thereby, disconnecting the input voltage from
the power supply.
Pin 6 offers three functions. By connecting a capacitor to
this pin, the internal glitch filter time delay can be pro-
grammed. Without the capacitor, the default time delay is
determined by an internal capacitor. This pin also serves
as a reset input to clear the internal latch after an overvolt-
age fault condition. By pulling it high, the OUT pin is
activated if the FB1 and FB2 voltages remain below the trip
threshold.
The LTC1696 is available in the low profile (1mm) ThinSOT
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
SCR Crowbar
V_CC
12V
SCR
2N6507
POWER
SUPPLY
R2
137k
1%
R1
44.2k
1%
1
FB1
TIMER/ ⁶
RESET
C1
1nF
LTC1696
2
GND
5
FB2
3
V_CC
C2
0.1µF
4
OUT
1696 TA01
V_OUT2
5V
V_OUT1
3.3V
R4
232k
1%
Q1
2N7002
R3
44.2k
1%
RESET
FB1
0.5V/DIV
TIMER/RESET
2V/DIV
I_OUT
20mA/DIV
Overvoltage Response
100µs/DIV
C1 = 1nF
1696 TA02
1