6

LT1528

Ripple Rejection

Load Regulation

Transient Response

Transient Response

OUTPUT (Pin 1): The Output pin supplies power to the

load. A minimum output capacitor of 3.3

µF is required to

prevent oscillations. Larger values will be needed to achieve

the transient performance required by high speed micro-

processors. See the Applications Information section for

more on output capacitance and reverse output character-

istics.

SENSE (Pin 2): The Sense pin is the input to the error

amplifier. Optimum regulation will be obtained at the point

where the Sense pin is connected to the Output pin. For

most applications the Sense pin is connected directly to

the Output pin at the regulator. In critical applications small

between the regulator and the load, which would normally

degrade regulation, may be eliminated by connecting the

Sense pin to the Output pin at the load as shown in Figure

1 (Kelvin Sense Connection). Note that the voltage drop

across the external PC traces will add to the dropout

voltage of the regulator. The Sense pin bias current is

150

µA at the nominal regulated output voltage. See Sense

Pin Current vs Temperature in the Typical Performance

Characteristics section. This pin is internally clamped to

The Sense pin can also be used with a resistor divider to

achieve output voltages above 3.3V. See the Applications

Information section for information on adjustable operation.

FREQUENCY (Hz)

20

30

50

70

80

10

1k

10k

1M

LT1528 • TPC19

10

100

100k

60

40

0

SOLID TANTALUM

SOLID TANTALUM

TEMPERATURE (

°C)

–50

0

–5

–10

–15

–20

–25

–30

25

75

LT1528 • TPC20

–25

0

50

100

125

TIME (

µs)

0

100

50

0

–50

–100

3

2

1

0

160

LT1528 • TPC22

40

20

60

100

140

180

80

120

200

TIME (

µs)

0

100

50

0

–50

–100

3

2

1

0

160

LT1528 • TPC21

40

20

60

100

140

180

80

120

200