LTC1696
Overvoltage Protection
Controller
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
±2%
Overvoltage Threshold Accuracy
Low Profile (1mm) ThinSOT
TM
Package
Gate Drive for SCR Crowbar or External N-Channel
Disconnect MOSFET
Monitors Two Output Voltages
Senses Output Voltages from 0.8V to 24V
Wide Supply Range: 2.7V to 27V
Multifunction TIMER/RESET Pin
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.
APPLICATIO S
s
s
s
s
Telecommunication Systems
Computer Systems
Industrial Control Systems
Notebook Computers
TYPICAL APPLICATIO
SCR Crowbar
Overvoltage Response
V
CC
12V
POWER
SUPPLY
V
OUT2
5V
V
OUT1
3.3V
R4
232k
1%
C1
1nF
Q1
2N7002
RESET
I
OUT
20mA/DIV
FB1
0.5V/DIV
R2
137k
1%
R1
44.2k
1%
1
FB1
TIMER/ 6
RESET
LTC1696
TIMER/RESET
2V/DIV
2
GND
FB2
5
R3
44.2k
1%
3
SCR
2N6507
C2
0.1µF
V
CC
OUT
4
1696 TA01
U
C1 = 1nF
100µs/DIV
1696 TA02
U
U
1
LTC1696
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
FB1 1
GND 2
V
CC
3
TIMER/
RESET
5 FB2
6
4 OUT
Supply Voltage (V
CC
) ............................................... 28V
Input Voltage
FB1, FB2 ............................................... – 0.3V to 17V
TIMER/RESET .......................................– 0.3V to 17V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART NUMBER
LTC1696ES6
S6 PART MARKING
LTLT
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 125°C,
θ
JA
= 256°C/W
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
I
VCC
V
FB
I
FB
V
FBHST
V
LKO
PARAMETER
Supply Voltage Range
Standby Supply Current
Active Supply Current
FB1, FB2 Feedback Threshold
FB1, FB2 Input Current
FB1, FB2 Feedback Hysteresis
V
CC
Undervoltage Lockout
Low-to-High Transition
High-to-Low Transition
V
CC
Undervoltage Lockout Hysteresis
TIMER/RESET Reset Low Threshold
TIMER/RESET Timer High Threshold
TIMER/RESET External Trigger High
Threshold
TIMER/RESET External Trigger High
Current
TIMER/RESET Timer Current
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 2.7V
≤
V
CC
≤
27V (Notes 3, 4) unless otherwise noted.
CONDITIONS
Operating Range
FB1, FB2 < V
FB
FB1, FB2 > V
FB
, C
OUT
= 1000pF
Voltage Going Positive
T
A
≥
0°C
T
A
< 0°C
q
q
q
q
q
q
MIN
2.7
TYP
170
1.1
MAX
27
540
3.5
0.898
0.907
UNITS
V
µA
mA
V
V
µA
mV
0.862
0.853
–1
0.880
0.880
– 0.05
12
High-to-Low Transition
FB1, FB2 > V
FB
q
q
1.75
1.64
0.78
1.11
1.35
2.05
1.94
110
0.865
1.185
1.50
260
2.35
2.24
0.95
1.26
1.65
650
22
26
22
26
40
8.0
3.3
0.45
28
28
V
LKH
V
RST
V
TIM
V
TRIG
I
TRIG
I
TIM
FB1, FB2 > V
FB
FB1, FB2 > V
FB
FB1, FB2 > V
FB
FB1, FB2 < V
FB
FB1, FB2 < V
FB
, TIMER/RESET = V
TRIG
FB1 = (V
FB
+ 30mV), FB2 < V
FB
FB1 = (V
FB
+ 200mV), FB2 < V
FB
FB2 = (V
FB
+ 30mV), FB1 < V
FB
FB2 = (V
FB
+ 200mV), FB1 < V
FB
FB1, FB2 = (V
FB
+ 200mV)
12V
≤
V
CC
≤
27V, FB1, FB2 > V
FB
, C
OUT
= 1000pF
V
CC
= 3.3V, FB1, FB2 > V
FB
, C
OUT
= 1000pF
FB1, FB2 < V
FB
, I
SINK
= 1mA, V
CC
= 3.3V
FB1 > V
FB
, FB2 < V
FB
, TIMER/RESET = Open,
C
OUT
= 1000pF
FB2 > V
FB
, FB1 < V
FB
, TIMER/RESET = Open,
C
OUT
= 1000pF
q
q
q
q
q
q
q
q
q
q
q
q
q
q
4
5
4
5
8
4.8
2.7
10
12
10
12
18
6.3
3.2
7
7
V
OUTH
V
OUTL
t
OVPD1
t
OVPD2
OUT High Voltage
OUT Low Voltage
OUT Propagation Delay for FB1
OUT Propagation Delay for FB2
2
U
V
V
mV
V
V
V
µA
µA
µA
µA
µA
µA
V
V
V
µs
µs
W
U
U
W W
W
LTC1696
ELECTRICAL CHARACTERISTICS
SYMBOL
t
OVPD1,2
t
r
I
OUTSC
PARAMETER
OUT Propagation Delay for FB1, FB2
OUT Rise Time
OUT Short-Circuit Current
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 2.7V
≤
V
CC
≤
27V (Notes 3, 4) unless otherwise noted.
CONDITIONS
FB1, FB2 > V
FB
, TIMER/RESET = Open
C
OUT
= 1000pF
FB1, FB2 > V
FB
, C
OUT
= 1000pF
12V
≤
V
CC
≤
27V, FB1, FB2 > V
FB
,
V
OUT
Shorted to GND
V
CC
= 2.7V, FB1, FB2 > V
FB
, V
OUT
Shorted to GND
q
q
q
q
MIN
TYP
6
0.4
MAX
24
3
160
18
UNITS
µs
µs
mA
mA
35
2
80
9
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
The LTC1696E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 4:
All typical numbers are given for V
CC
= 12V and T
A
= 25°C.
3
LTC1696
TYPICAL PERFOR A CE CHARACTERISTICS
Standby Supply Current
vs Supply Voltage
200
180
160
SUPPLY CURRENT (µA)
SUPPLY CURRENT (mA)
T
A
= 25°C
SUPPLY CURRENT (µA)
140
120
100
80
60
40
20
0
0
5
15
20
10
SUPPLY VOLTAGE (V)
25
30
1696 G01
Active Supply Current
vs Temperature
FB1, FB2 FEEDBACK THRESHOLD VOLTAGE (V)
1.20
0.8814
0.8811
0.8808
0.8805
0.8802
0.8799
0.8796
FB1, FB2 FEEDBACK THRESHOLD VOLTAGE (V)
V
CC
= 12V
C
OUT
= 1000pF
1.15
SUPPLY CURRENT (mA)
1.10
1.05
1.00
0.95
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G04
TIMER Threshold Voltage
vs Supply Voltage
1.200
TIMER THRESHOLD VOLTAGE (V)
1.24
T
A
= 25°C
TIMER THRESHOLD VOLTAGE (V)
1.195
1.190
1.185
1.180
1.175
1.170
1.165
1.160
0
5
20
15
SUPPLY VOLTAGE (V)
10
25
30
1696 G07
TIMER CURRENT (µA)
4
U W
Standby Supply Current
vs Temperature
200
190
180
170
160
150
140
130
120
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G02
Active Supply Current
vs Supply Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
5
20
15
10
SUPPLY VOLTAGE (V)
25
30
1696 G03
V
CC
= 12V
T
A
= 25°C
C
OUT
= 1000pF
FB1, FB2 Feedback Threshold
Voltage vs Supply Voltage
T
A
= 25°C
FB1, FB2 Feedback Threshold
Voltage vs Temperature
0.90
V
CC
= 12V
0.89
0.88
0.87
0.86
0
3
6
9 12 15 18 21 24 27 30
SUPPLY VOLTAGE (V)
1696 G05
0.85
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G06
TIMER Threshold Voltage
vs Temperature
V
CC
= 12V
20
18
TIMER Current vs Supply Voltage
T
A
= 25°C
FB1 AND FB2 OVERDRIVE = 200mV
16
14
FB1 OR FB2 OVERDRIVE = 200mV
12
10
8
1.22
1.20
1.18
1.16
1.14
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G08
0
5
10
15
20
SUPPLY VOLTAGE (V)
25
30
1696 G09
LTC1696
TYPICAL PERFOR A CE CHARACTERISTICS
TIMER Current vs Temperature
22
20
V
CC
= 12V
TIMER CURRENT (µA)
TIMER CURRENT (µA)
18
16
14
12
10
FB1 OR FB2 OVERDRIVE = 200mV
FB1 AND FB2 OVERDRIVE = 200mV
TIMER CURRENT (µA)
8
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G10
Glitch Filter Timer
vs Feedback Overdrive
25
V
CC
= 3.3V
T
A
= 25°C
GLITCH FILTER TIMER (µs)
V
CC
= 12V
T
A
= 25°C
EXTERNAL TRIGGER TRESHOLD VOLTAGE (V)
GLITCH FILTER TIMER (µs)
20
15
FB1 OR FB2 OVERDRIVE
10
FB1 AND FB2 OVERDRIVE
5
0
0
50
150
200
100
FEEDBACK OVERDRIVE (mV)
External Trigger Threshold
Voltage vs Temperature
EXTERNAL TRIGGER THRESHOLD VOLTAGE (V)
1.505
1.500
V
CC
= 12V
RESET THRESHOLD VOLTAGE (V)
0.864
0.862
0.860
0.858
0.856
0.854
0.852
0
5
20
15
SUPPLY VOLTAGE (V)
10
25
30
1696 G17
RESET TRHESHOLD VOLTAGE (V)
1.495
1.490
1.485
1.480
1.475
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G16
U W
1696 G13
TIMER Current
vs Feedback Overdrive
20
V
CC
= 12V
T
A
= 25°C
16
TIMER Current
vs Feedback Overdrive
V
CC
= 3.3V
T
A
= 25°C
FB1 AND FB2 OVERDRIVE
16
FB1 AND FB2 OVERDRIVE
14
12
FB1 OR FB2 OVERDRIVE
10
8
6
4
12
FB1 OR FB2 OVERDRIVE
8
4
0
0
50
150
200
100
FEEDBACK OVERDRIVE (mV)
250
1696 G11
0
50
100
150
200
FEEDBACK OVERDRIVE (mV)
250
1696 G12
Glitch Filter Timer
vs Feedback Overdrive
30
25
20
15
10
5
0
FB1 OR FB2 OVERDRIVE
FB1 AND FB2 OVERDRIVE
External Trigger Threshold
Voltage vs Supply Voltage
1.51
1.50
1.49
1.48
1.47
1.46
1.45
1.44
0
5
20
15
10
SUPPLY VOLTAGE (V)
25
30
1696 G15
T
A
= 25°C
250
0
50
100
150
200
FEEDBACK OVERDRIVE (mV)
250
1696 G14
RESET Threshold Voltage
vs Supply Voltage
0.868
0.866
T
A
= 25°C
0.880
0.875
0.870
0.865
0.860
0.855
0.850
0.845
RESET Threshold Voltage
vs Temperature
V
CC
= 12V
0.840
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1696 G18
5
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