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LT1528

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Ground Pin Current (Note 5)

ILOAD = 0mA, TJ = 25°C

450

750

µA

ILOAD = 0mA, TJ = 125°C (Note 6)

1.9

ILOAD = 100mA, TJ = 25°C

1.2

2.5

ILOAD = 100mA, TJ = 125°C (Note 6)

2.7

ILOAD = 300mA, TJ = 25°C

2.6

4.0

ILOAD = 300mA, TJ = 125°C (Note 6)

4.1

ILOAD = 700mA, TJ = 25°C

7.3

12.0

ILOAD = 700mA, TJ = 125°C (Note 6)

8.8

ILOAD = 1.5A

ILOAD = 3A

140

Sense Pin Current (Notes 3, 7)

TJ = 25°C

130

250

µA

Shutdown Threshold

VOUT = Off-to-On

1.20

2.80

VOUT = On-to-Off

0.25

0.75

Shutdown Pin Current (Note 8)

VSHDN = 0V

100

µA

Quiescent Current in Shutdown (Note 9)

VIN = 6V, VSHDN = 0V

110

220

µA

Ripple Rejection

VIN – VOUT = 1V(Avg), VRIPPLE = 0.5VP-P,50

fRIPPLE = 120Hz, ILOAD = 1.5A

Current Limit

VIN – VOUT = 7V, TJ = 25°C

4.5

VIN = 4.3V, ∆VOUT = – 0.1V

3.2

4.0

Input Reverse Leakage Current

VIN = – 15V, VOUT = 0V

1.0

Reverse Output Current (Note 10)

VOUT = 3.3V, VIN = 0V

120

250

µA

The q denotes specifications which apply over the full operating

temperature range.

Note 1: The Shutdown pin input voltage rating is required for a low

impedance source. Internal protection devices connected to the Shutdown

pin will turn on and clamp the pin to approximately 7V or – 0.6V. This

range allows the use of 5V logic devices to drive the pin directly. For high

impedance sources or logic running on supply voltages greater than 5.5V,

the maximum current driven into the Shutdown pin must be less than

5mA.

Note 2: Operating conditions are limited by maximum junction

temperature. The regulated output voltage specification will not apply for

all possible combinations of input voltage and output current. When

operating at maximum input voltage, the output current must be limited.

When operating at maximum output current, the input voltage range

must be limited.

Note 3: The LT1528 is tested and specified with the Sense pin connected

to the Output pin.

Note 4: Dropout voltage is the minimum input/output voltage required to

maintain regulation at the specified output current. In dropout the output

voltage will be equal to: (VIN – VDROPOUT).

Note 5: Ground pin current is tested with VIN = VOUT (nominal) and a

current source load. This means that the device is tested while operating in

its dropout region. This is the worst-case Ground pin current. The Ground

pin current will decrease slightly at higher input voltages.

Note 6: Ground pin current will rise at TJ > 75°C. This is due to internal

circuitry designed to compensate for leakage currents in the output

transistor at high temperatures. This allows quiescent current to be

minimized at lower temperatures, yet maintain output regulation at high

temperatures with light loads. See quiescent current curve in typical

performance characteristics section.

Note 7: Sense pin current flows into the Sense pin.

Note 8: Shutdown pin current at VSHDN = 0V flows out of the Shutdown pin.

Note 9: Quiescent current in shutdown is equal to the total sum of the

Shutdown pin current (40

µA) and the Ground pin current (70µA).

Note 10: Reverse output current is tested with the input pin grounded and

the Output pin forced to the rated output voltage. This current flows into

the Output pin and out of the Ground pin.

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