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LT3027

Dual 100mA, Low Dropout, Low Noise, Micropower Regulator with Independent Inputs

Linear Technology 

LT3027

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

GND Pin Current (Per Channel)

VIN = VOUT(NOMINAL)

(Notes 5, 7)

Output Voltage Noise

ADJ1/ADJ2 Pin Bias Current

ILOAD = 0mA

●

ILOAD = 1mA

●

ILOAD = 10mA

●

ILOAD = 50mA

●

ILOAD = 100mA

●

COUT = 10µF, CBYP = 0.01µF, ILOAD = 100mA, BW = 10Hz to 100kHz

(Notes 3, 8)

25

50

60

120

250 400

1

2

2.4

4

20

30

100

µA

µA

µA

mA

mA

µVRMS

nA

Shutdown Threshold

VOUT = Off to On

VOUT = On to Off

●

0.8

1.4

V

● 0.25 0.65

V

SHDN1/SHDN2 Pin Current

(Note 9)

VSHDN = 0V

VSHDN = 20V

●

0

0.5

µA

●

1

3

µA

Quiescent Current in Shutdown

VIN = 6V, VSHDN = 0V (Both SHDN Pins)

0.01

0.1

µA

Ripple Rejection (Note 3)

VIN = 2.72V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz,

ILOAD = 100mA

55

65

dB

Current Limit

VIN = 7V, VOUT = 0V

VIN = 2.3V, ∆VOUT = – 5%

200

mA

● 110

mA

Input Reverse Leakage Current

VIN = – 20V, VOUT = 0V

●

1

mA

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LT3027 regulator is tested and specified under pulse load

conditions such that TJ ≈ TA. The LT3027E is guaranteed to meet

performance specifications from 0°C to 125°C junction temperature.

Specifications over the – 40°C to 125°C operating junction temperature

range are assured by design, characterization and correlation with

statistical process controls. The LT3027I is guaranteed and tested over the

full – 40°C to 125°C operating junction temperature range.

Note 3: The LT3027 is tested and specified for these conditions with the

ADJ1/ADJ2 pin connected to the corresponding OUT1/OUT2 pin.

Note 4: 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 range must be

limited. When operating at maximum output current, the input voltage

range must be limited.

Note 5: To satisfy requirements for minimum input voltage, the LT3027 is

tested and specified for these conditions with an external resistor divider

(two 250k resistors) for an output voltage of 2.44V. The external resistor

divider will add a 5µA DC load on the output.

Note 6: Dropout voltage is the minimum input to output voltage differential

needed to maintain regulation at a specified output current. In dropout, the

output voltage will be equal to: VIN – VDROPOUT.

Note 7: GND pin current is tested with VIN = 2.44V and a current source

load. This means the device is tested while operating in its dropout region

or at the minimum input voltage specification. This is the worst-case GND

pin current. The GND pin current will decrease slightly at higher input

voltages.

Note 8: ADJ1 and ADJ2 pin bias current flows into the pin.

Note 9: SHDN1 and SHDN2 pin current flows into the pin.

Note 10: For the LT3027 dropout voltage will be limited by the minimum

input voltage specification under some output voltage/load conditions. See

the curve of Minimum Input Voltage in the Typical Performance

Characteristics.

3027f

3

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