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Linear Technology Electronic Components Datasheet

LTC1696 Datasheet

Overvoltage Protection Controller

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LTC1696 pdf
FEATURES
nn ±2% Overvoltage Threshold Accuracy
nn Low Profile (1mm) ThinSOTPackage
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
LTC1696
Overvoltage Protection
Controller
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
VCC
12V
POWER
SUPPLY
R2
137k
1%
R1
44.2k
1%
1 FB1
TIMER/ 6
RESET
LTC1696
2 GND
FB2 5
C1
1nF
SCR
2N6507
3 VCC
C2
0.1µF
OUT 4
1696 TA01
VOUT2
5V
VOUT1
3.3V
R4
232k
1%
Q1
2N7002
R3
44.2k
1%
RESET
Overvoltage Response
FB1
0.5V/DIV
TIMER/RESET
2V/DIV
IOUT
20mA/DIV
C1 = 1nF
100µs/DIV 1696 TA02
For more information www.linear.com/LTC1696
1696fb
1


Linear Technology Electronic Components Datasheet

LTC1696 Datasheet

Overvoltage Protection Controller

No Preview Available !

LTC1696 pdf
LTC1696
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (VCC).................................................28V
Input Voltage
FB1, FB2................................................ – 0.3V to 17V
TIMER/RESET......................................... –0.3V to 17V
Operating Junction Temperature Range (Note 2)
LTC1696E............................................ –40°C to 125°C
LTC1696I............................................ –40°C to 125°C
LTC1696H........................................... –40°C to 150°C
Storage Temperature Range.................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
FB1 1
GND 2
VCC 3
TOP VIEW
6
TIMER/
RESET
5 FB2
4 OUT
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 192°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC1696ES6#PBF
LTC1696ES6#TRPBF
LTLT
6-Lead Plastic TSOT-23
–40°C to 125°C
LTC1696IS6#PBF
LTC1696IS6#TRPBF
LTLT
6-Lead Plastic TSOT-23
–40°C to 125°C
LTC1696HS6#PBF
LTC1696HS6#TRPBF
LTLT
6-Lead Plastic TSOT-23
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. 2.7V ≤ VCC ≤ 27V (Notes 2, 3, 4) unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Supply Voltage Range
IVCC Standby Supply Current
Active Supply Current
VFB FB1, FB2 Feedback Threshold
IFB
VFBHST
VLKO
FB1, FB2 Input Current
FB1, FB2 Feedback Hysteresis
VCLCoUwn-tdoe-rHvioglhtaTgreanLsoictikoonut
High-to-Low Transition
Operating Range
FB1, FB2 < VFB
FB1, FB2 > VFB, COUT = 1000pF
Voltage Going Positive TA ≥ 0°C and TA ≤ 85°C
TTAA
0°C
0°C
and
and
TTAA
125°C
150°C
TA < 0°C
High-to-Low Transition
FB1, FB2 > VFB
2.7
0.862
0.858
0.853
0.853
–1
170
1.1
0.880
0.880
0.880
0.880
– 0.05
12
27
540
3.5
0.898
0.898
0.898
0.907
1.75 2.05 2.35
1.64 1.94 2.24
V
µA
mA
V
V
V
V
µA
mV
V
V
VLKH VCC Undervoltage Lockout Hysteresis FB1, FB2 > VFB
VRST
TIMER/RESET Reset Low Threshold
FB1, FB2 > VFB
VTIM TIMER/RESET Timer High Threshold FB1, FB2 > VFB, TA ≤ 85°C
TTAA
125°C
150°C
0.78
1.11
1.08
1.07
110
0.865
1.185
1.185
1.185
0.95
1.26
1.26
1.26
mV
V
V
V
V
1696fb
2 For more information www.linear.com/LTC1696


Part Number LTC1696
Description Overvoltage Protection Controller
Maker Linear
Total Page 14 Pages
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