LTC2913

10

2913fa

TYPICAL APPLICATIONS

APPLICATIONS INFORMATION

on the pin. Assuming a 150pF load capacitance, the fall

time is 16.5ns.

The rise time on the UV and OV pins is limited by a 400k

output rise time (10% to 90%) at the UV and OV pins:

OV Latch (LTC2913-1)

With the LATCH pin held low, the OV pin latches low when

an OV condition is detected. The latch is cleared by raising

the LATCH pin high. If an OV condition clears while LATCH

is held high, the latch is bypassed and the OV pin behaves

the same as the UV pin with a similar timeout period at the

output. If LATCH is pulled low while the timeout period is

active, the OV pin latches as before.

Disable (LTC2913-2)

The LTC2913-2 allows disabling the UV and OV outputs

via the DIS pin. Pulling DIS high will force both outputs

to remain weakly pulled high, regardless of any faults

that occur on the inputs. However, if a UVLO condition

occurs, UV asserts and pulls low, but the timeout function

is bypassed. UV pulls high as soon as the UVLO condition

is cleared.

DIS has a weak 2µA (typical) internal pull-down current

guaranteeing normal operation with the pin left open.

Dual UV/OV Supply Monitor, 10% Tolerance, 5V, 3.3V

27.4k

1k

44.2k

10

6

7

8

9

5

4

3

2

1

VH1

VL1

VH2

GND

TMR

SYSTEM

POWER

SUPPLIES

VL2

OV

UV

2913 TA02

LATCH

4.53k

22nF TIMEOUT = 200ms

1k

4.53k

LTC2913-1

0.1 F

5V

3.3V

44.2k

1k

115k

10k

10

6

7

8

9

5

4

3

2

1

VH1

VL1

VH2

GND

TMR

SYSTEM

POWER

SUPPLIES

VL2

OV

UV

2913 TA03

DIS

4.53k

1k

4.53k

LTC2913-2

0.1 F

12V

5V

Supply Monitor Powered from 12V, 10% Tolerance, 12V, 5V