LINEAR TECHNOLOGY LTC1696 Technical data

FEATURES

■

±2% Overvoltage Threshold Accuracy

■

Low Profile (1mm) ThinSOTTM 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

LTC1696

Overvoltage Protection

Controller

U

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 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.

U

APPLICATIO S

■

Telecommunication Systems

■

Computer Systems

■

Industrial Control Systems

■

Notebook Computers

TYPICAL APPLICATIO

SCR Crowbar

V

CC

12V

POWER
SUPPLY

U

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.

, LTC and LT are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

Overvoltage Response

V

OUT2

5V
V

OUT1

3.3V

FB1

0.5V/DIV

SCR

2N6507

137k

1%

44.2k
1%

R2

1

FB1

R1

C2

0.1µF

LTC1696

2

GND

3

V

CC

TIMER/

RESET

FB2

OUT

6

5

4

1696 TA01

C1
1nF

R4
232k
1%

2N7002

R3

44.2k
1%

TIMER/RESET

2V/DIV

Q1

RESET

I

OUT

20mA/DIV

100µs/DIV

C1 = 1nF

1696 TA02

1

LTC1696

PACKAGE/ORDER I FOR ATIO

UU

W

FB1 1

GND 2

V

CC

3

6
5 FB2
4 OUT

TOP VIEW

TIMER/
RESET

S6 PACKAGE

6-LEAD PLASTIC SOT-23

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Supply Voltage (VCC) ............................................... 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

T

= 125°C, θJA = 256°C/W

JMAX

Consult LTC Marketing for parts specified with wider operating temperature
ranges.

LTLT

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. 2.7V ≤ VCC ≤ 27V (Notes 3, 4) unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

I

VCC

V

FB

I

FB

V

FBHST

V

LKO

V

LKH

V

RST

V

TIM

V

TRIG

I

TRIG

I

TIM

V

OUTH

V

OUTL

t

OVPD1

t

OVPD2

2

Supply Voltage Range Operating Range ● 2.7 27 V
Standby Supply Current FB1, FB2 < V
Active Supply Current FB1, FB2 > VFB, C
FB1, FB2 Feedback Threshold Voltage Going Positive TA ≥ 0°C ● 0.862 0.880 0.898 V

FB1, FB2 Input Current ● – 1 – 0.05 µA
FB1, FB2 Feedback Hysteresis High-to-Low Transition 12 mV
VCC Undervoltage Lockout FB1, FB2 > V

Low-to-High Transition ● 1.75 2.05 2.35 V
High-to-Low Transition

VCC Undervoltage Lockout Hysteresis FB1, FB2 > V
TIMER/RESET Reset Low Threshold FB1, FB2 > V
TIMER/RESET Timer High Threshold FB1, FB2 > V
TIMER/RESET External Trigger High FB1, FB2 < V

Threshold
TIMER/RESET External Trigger High FB1, FB2 < VFB, TIMER/RESET = V

Current
TIMER/RESET Timer Current FB1 = (VFB + 30mV), FB2 < V

OUT High Voltage 12V ≤ VCC ≤ 27V, FB1, FB2 > VFB, C

OUT Low Voltage FB1, FB2 < VFB, I
OUT Propagation Delay for FB1 FB1 > VFB, FB2 < VFB, TIMER/RESET = Open, ● 728 µs

OUT Propagation Delay for FB2 FB2 > VFB, FB1 < VFB, TIMER/RESET = Open, ● 728 µs

The ● denotes the specifications which apply over the full operating

FB

OUT

FB

FB

FB

FB

FB

FB1 = (V
FB2 = (V
FB2 = (V
FB1, FB2 = (V

V

CC

C

OUT

C

OUT

+ 200mV), FB2 < V

FB

+ 30mV), FB1 < V

FB

+ 200mV), FB1 < V

FB

+ 200mV) ● 81840 µA

FB

= 3.3V, FB1, FB2 > VFB, C

SINK

= 1000pF

= 1000pF

● 170 540 µA

= 1000pF ● 1.1 3.5 mA

< 0°C ● 0.853 0.880 0.907 V

T

A

● 1.64 1.94 2.24 V

110 mV

● 0.78 0.865 0.95 V

● 1.11 1.185 1.26 V

● 1.35 1.50 1.65 V

TRIG

FB

FB

FB

FB

= 1000pF ● 4.8 6.3 8.0 V

OUT

= 1000pF ● 2.7 3.2 3.3 V

OUT

= 1mA, VCC = 3.3V ● 0.45 V

● 260 650 µA

● 41022 µA

● 51226 µA

● 41022 µA

● 51226 µA

LTC1696

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. 2.7V ≤ VCC ≤ 27V (Notes 3, 4) unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

t

OVPD1,2

t

r

I

OUTSC

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.

OUT Propagation Delay for FB1, FB2 FB1, FB2 > VFB, TIMER/RESET = Open ● 624 µs

= 1000pF

C

OUT

OUT Rise Time FB1, FB2 > VFB, C
OUT Short-Circuit Current 12V ≤ VCC ≤ 27V, FB1, FB2 > VFB, ● 35 80 160 mA

Shorted to GND

V

OUT

VCC = 2.7V, FB1, FB2 > VFB, V

= 1000pF ● 0.4 3 µs

OUT

Shorted to GND ● 2918 mA

OUT

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

= 12V and TA = 25°C.

CC

3

LTC1696

SUPPLY VOLTAGE (V)

0

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

15 25

1696 G03

510

20 30

SUPPLY CURRENT (mA)

TA = 25°C
C

OUT

= 1000pF

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Standby Supply Current
vs Supply Voltage

200

TA = 25°C

180
160
140
120
100

80
60

SUPPLY CURRENT (µA)

40
20

0

5

0

10

SUPPLY VOLTAGE (V)

Active Supply Current
vs Temperature

1.20
VCC = 12V

= 1000pF

C

OUT

1.15

1.10

1.05

SUPPLY CURRENT (mA)

1.00

15 20

Standby Supply Current
vs Temperature

200

VCC = 12V

190

180

170

160

150

SUPPLY CURRENT (µA)

140

130

30

25

1696 G01

120

–35 125

–55

–15

25

45

5

TEMPERATURE (°C)

65

105

85

1696 G02

FB1, FB2 Feedback Threshold
Voltage vs Supply Voltage

0.8814
TA = 25°C

0.8811

0.8808

0.8805

0.8802

0.8799

Active Supply Current
vs Supply Voltage

FB1, FB2 Feedback Threshold
Voltage vs Temperature

0.90
VCC = 12V

0.89

0.88

0.87

0.86

0.95
–55

TIMER Threshold Voltage
vs Supply Voltage TIMER Current vs Supply Voltage

1.200

1.195

1.190

1.185

1.180

1.175

1.170

TIMER THRESHOLD VOLTAGE (V)

1.165

1.160
0

4

–35 5

–15

TA = 25°C

510 20

25

TEMPERATURE (°C)

15

SUPPLY VOLTAGE (V)

85

45 125

105

65

1696 G04

25

1696 G07

FB1, FB2 FEEDBACK THRESHOLD VOLTAGE (V)

0.8796
6121824

SUPPLY VOLTAGE (V)

TIMER Threshold Voltage
vs Temperature

1.24
VCC = 12V

1.22

1.20

1.18

1.16

TIMER THRESHOLD VOLTAGE (V)

1.14

–35 5

–15

30

–55

TEMPERATURE (°C)

85

45 125

65

25

1696 G05

105

1696 G08

FB1, FB2 FEEDBACK THRESHOLD VOLTAGE (V)

0.85
–35 5

–15

3030 9 15 21 27

–55

20

TA = 25°C

18

16

14

12

TIMER CURRENT (µA)

10

FB1 OR FB2 OVERDRIVE = 200mV

8

0

5

25

TEMPERATURE (°C)

FB1 AND FB2 OVERDRIVE = 200mV

10 15 20

SUPPLY VOLTAGE (V)

85

45 125

105

65

1696 G06

25 30

1696 G09