17

TNY274-280

E

2/06

NOTES:

A. I

low under these conditions. Total device consumption at no-load is the sum of I

B 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 BP/M pin current at 6.1 V.

C. BP/M pin is not intended for sourcing supply current to external circuitry.

D. To ensure correct current limit it is recommended that nominal 0.1 µF / 1 µF / 10 µF capacitors are used. In

addition, the BP/M capacitor value tolerance should be equal or better than indicated below across the ambient

temperature range of the target application. The minimum and maximum capacitor values are guaranteed by

characterization.

E. For current limit at other di/dt values, refer to Figure 23.

F. TNY274 does not set an increased current limit value, but with a 10 µF BP/M pin capacitor the current limit is the

same as with a 1 µF BP/M pin capacitor (reduced current limit value).

G. This parameter is derived from characterization.

H. This parameter is derived from the change in current limit measured at 1X and 4X of the di/dt shown in the I

LIMIT

specification.

I. I

temperature. I

consumption calculations.

J. Breakdown voltage may be checked against minimum BV

to but not exceeding minimum BV

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

frequency).

Parameter

Symbol

Conditions

SOURCE = 0 V; T

See Figure 16

(Unless Otherwise Specified)

Min

Typ

Max

Units

OUTPUT (cont.)

Auto-Restart

ON-Time at f

OSC

t

AR

T

See Note K

64

ms

Auto-Restart

Duty Cycle

DC

AR

T

3

%

Nominal BP/M

Pin Cap Value

Tolerance Relative to Nominal

Capacitor Value

Min

MAX

0.1 µF

-60%

+100%

1 µF

-50%

+100%

10 µF

-50%

NA