Electrical Characteristics

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Reference Voltage

2.75V

1.225

1.250

1.275

V

Output Voltage

HT1087-15

1.470

1.500

1.530

V

HT1087-18

1.764

1.800

1.836

V

HT1087-25

2.450

2.500

2.550

V

HT1087-33

3.234

3.300

3.366

V

HT1087-50

4.900

5.000

5.100

V

Load Regulation (see note 2)

1

¾

20

mV

Line Regulation

2.75V

¾

0.015

0.15

%/V

Dropout Voltage (see note 3)

¾

1.1

1.3

V

Current Limit (see note 4)

0.5

1.5

¾

A

Adjust Pin Current

(Variable Version)

2.75V

¾

55

120

mA

Quiescent Current

(Fixed Version)

2.75V

¾

813

mA

RR

Ripple Rejection

120Hz input ripple

mF

¾

60

¾

dB

Temperature Coefficient

-40°C<Ta<85°C

¾±0.4

¾

mV/

°C

Note:

1. Specifications are production tested at room temperature, Ta. Specifications within the

-40°Cto85°C

operating temperature range are assured by design, characterization and correlation with Statistical Quality

Controls (SQC).

2. Load regulation is measured at a constant junction temperature, using pulse testing with a low ON time and

is guaranteed up to the maximum power dissipation. Power dissipation is determined by the input/output

differential voltage and the output current. Guaranteed maximum power dissipation will not be available over

the full input/output range. The maximum allowable power dissipation at any ambient temperature is

3. Dropout voltage is defined as the input voltage minus the output voltage that produces a 2% change in the

4. Current limit is measured by pulsing for a short time.

HT1087 Series

Rev. 1.10

3

October 5, 2007