ST777/778/779

3/11

Note 3: Start-up guaranteed under these load conditions.

Note 4: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.

Note 5: In the ST779 supply current depends on the resistor divider used to set the output voltage.

comparator trip point.

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Start up Voltage

1

V

Maximum Input Voltage

(Note 1,2)

6

V

Output Voltage ST777 779

(set to 5V), (Note 3)

4.8

5.0

5.2

V

Output Voltage ST778

(Note 3)

SEL=0V

3.17

3.30

3.43

V

SEL=OPEN

2.88

3.00

3.12

V

Output Voltage Range

ST779

(Note 4)

2.7

6.5

V

No Load Supply Current

270

µA

Shutdown Supply Current

SHDN=0V, (Switch OFF)

20

35

µA

Shutdown Input Current

15

100

nA

12

40

µA

υ

Efficiency

82

%

Shutdown Input Threshold

V

Current Limit

1.0

A

Coefficient

-0.3

%/°C

Minimum Switch Off Time

1.2

µs

Maximum Switch ON Time

4.5

6.5

15

0.25

V

0.33

0.5

0.18

V

0.22

0.4

Error Comparator Trip Point ST779, over operating input

voltage (Note 6)

1.23

±2%

V

FB Pin Bias Current

50

nA

Switch Off Leakage Current

0.1

µA

Rectifier Off Leakage

Current

0.1

µA