LTC1696_15 Datasheet, PDF (1/14 Pages) Linear Technology – Overvoltage Protection Controller

LTC1696
Overvoltage Protection
Controller
FEATURES
nn _{±2% Overvoltage Threshold Accuracy}
nn _{Low Profile (1mm) ThinSOT}^™ _Package
nn _{Gate Drive for SCR Crowbar or External N-Channel}
Disconnect MOSFET
nn _{Monitors Two Output Voltages}
nn _{Senses Output Voltages from 0.8V to 24V}
nn _{Wide Supply Range: 2.7V to 27V}
nn _{Multifunction TIMER/RESET Pin}
APPLICATIONS
nn _{Telecommunication Systems}
nn _{Computer Systems}
nn _{Industrial Control Systems}
nn _{Notebook Computers}
DESCRIPTION
The LTC^®1696 is a standalone power supply overvolt-
age 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
condition 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
programmed. 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
overvoltage 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.All other
trademarks are the property of their respective owners. .
TYPICAL APPLICATION
SCR Crowbar
V_CC
POWER
12V
SUPPLY
R2
137k
1%
R1
44.2k
1%
1
FB1
TIMER/ ⁶
RESET
C1
1nF
LTC1696
2
GND
5
FB2
SCR
2N6507
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
Overvoltage Response
FB1
0.5V/DIV
TIMER/RESET
2V/DIV
I_OUT
20mA/DIV
100µs/DIV
C1 = 1nF
1696 TA02
For more information www.linear.com/LTC1696
1696fb
1