Electrical Characteristics

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Operating Input Voltage

¾¾

¾

5.5

V

Minimum Input Voltage

¾¾

0.7

¾

V

Start-up Input Voltage

W¾

0.7

0.9

V

Output Voltage

FB=OUT

3.17

3.30

3.43

V

FB=GND

4.80

5.00

5.20

V

external resistors

1.80

¾

5.50

V

Reference Voltage

1.268

1.300

1.333

V

mA

¾

10

30

mV

Reference Line Regulation

¾

5

10

mV/V

Internal PMOS and

N-MOS On Resistance

¾

0.3

¾W

Internal NMOS Switch

Current Limit

HT77S10

0.80

1.00

1.20

A

HT77S11

0.40

0.55

0.75

A

¾

0.05

1.00

mA

Steady-State Output Current

FB=OUT

HT77S10

300

350

¾

mA

HT77S11

150

300

¾

mA

FB=GND

HT77S10

180

230

¾

mA

HT77S11

90

160

¾

mA

Quiescent Current

¾

20

35

mA

FB Input Threshold

¾

1.268

1.300

1.333

V

LBI Input Threshold

¾

1.268

1.300

1.333

V

LBO Low Output Voltage

¾

0.2

0.4

V

LBO Off Leakage Current

¾

0.07

1.00

mA

Shutdown Current

SHDN=GND

¾

0.1

1

mA

SHDN Pin Voltage High

¾

1.5

¾¾

V

SHDN Pin Voltage Low

¾¾

¾

0.4

V

LX Switch On Time

247

ms

LX Switch Off Time

0.6

0.9

1.4

ms

h

Efficiency

¾

90

¾

%

¾

85

¾

%

Note:

Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings

indicate conditions for which the device is intended to be functional, but do not guarantee specific performance

limits. The guaranteed specifications apply only for the test conditions listed.

Specifications are production tested at Ta=25 degree. Specifications over -40 to 85 degree operating tempera-

ture range are assured by design.

HT77S10/HT77S11

Rev. 1.00

4

February 3, 2010