B

8/99

TNY256

11

NOTES:

1. For a threshold with a negative value, negative hysteresis is a decrease in magnitude of the corresponding threshold.

2. Total current consumption is the sum of I

and the sum of I

3. Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the

DRAIN. An alternative is to measure the BYPASS pin current at 6.2 V.

4. BYPASS pin is not intended for sourcing supply current to external circuitry.

5. See typical performance characteristics section for BYPASS pin start-up charging waveform.

6. For current limit at other di/dt values, refer to current limit vs. di/dt curve under typical performance

characteristics.

7. This parameter is derived from characterization.

8. This parameter is derived from the change in current limit measured at 5X and 10X of the di/dt shown in the I

LIMIT

specification.

9. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to

frequency).

Conditions

Parameter

Symbol

SOURCE = 0 V; T

See Figure 14

(Unless Otherwise Specified)

50

0.5

t

EN/UV

t

DST

V

µs

µs

ms

%

DRAIN Supply

Voltage

Output EN/UV

Delay

Output Disable

Setup Time

Min

Typ

Max

Units

OUTPUT (cont.)

10

Auto-Restart,

ON-Time

Auto-Restart

Duty Cycle

t

AR

DC

AR

32.0

20

28.9

35.2

T

See Note 10

24

16

See Note 8