LT1963 datasheet(3/26 Pages) LINER

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LT3088

3088fb

For more information www.linear.com/LT3088

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TJ = 25°C. (Note 2)

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SET Pin Current

ISET

VIN = 2V, ILOAD = 2mA

2V ≤ VIN ≤ 36V, 2mA ≤ ILOAD ≤ 800mA

49.5

50.5

µA

Offset Voltage

VOS

(VOUT – VSET)

VIN = 2V, ILOAD = 2mA

–1.5

–3.5

1.5

3.5

ISET Load Regulation

∆ILOAD = 2mA to 800mA

–0.1

VOS Load Regulation

∆ILOAD = 2mA to 800mA

(Note 7)

DD Package

–0.5

–3

M, ST Packages

–1.5

–4

Line Regulation

∆ISET

∆VOS

∆VIN = 2V to 36V, ILOAD = 2mA

1.5

0.001

nA/V

mV/V

Minimum Load Current (Note 3)

2V ≤ VIN ≤ 36V

0.4

Dropout Voltage (Note 4)

ILOAD = 100mA

ILOAD = 800mA

1.21

1.35

1.6

Current Limit

VIN = 5V, VSET = 0V, VOUT = –0.1V

0.8

1.2

Reference Current RMS Output Noise (Note 5)

10Hz ≤ f ≤ 100kHz

5.7

nARMS

Error Amplifier RMS Output Noise (Note 5)

ILOAD = 800mA, 10Hz ≤ f ≤ 100kHz,

COUT = 0µF, CSET = 0.1µF

µVRMS

Ripple Rejection

VRIPPLE = 0.5VP-P, ILOAD = 0.1A, CSET = 0.1µF,

COUT=10µF, VIN = VOUT(NOMINAL) + 3V

f = 120Hz

f = 10kHz

f = 1MHz

Thermal Regulation, ISET

10ms Pulse

0.003

%/W

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: Unless otherwise specified, all voltages are with respect to VOUT.

The LT3088 is tested and specified under pulse load conditions such

that TJ ≈ TA. The LT3088E is tested at TA = 25°C and performance is

guaranteed from 0°C to 125°C. Performance of the LT3088E over the

full –40°C and 125°C operating temperature range is assured by design,

characterization, and correlation with statistical process controls. The

LT3088I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT3088MP is 100% tested and guaranteed

over the –55°C to 150°C operating junction temperature range. The

LT3088H is tested at 150°C operating junction temperature. High junction

temperatures degrade operating lifetimes. Operating lifetime is degraded at

junction temperatures greater than 125°C.

Note 3: Minimum load current is equivalent to the quiescent current of

the part. Since all quiescent and drive current is delivered to the output

of the part, the minimum load current is the minimum current required to

maintain regulation.

Note 4: For the LT3088, dropout is specified as the minimum input-to-

output voltage differential required supplying a given output current.

Note 5: Adding a small capacitor across the reference current resistor

lowers output noise. Adding this capacitor bypasses the resistor shot

noise and reference current noise; output noise is then equal to error

amplifier noise (see Applications Information section).

Note 6: Diodes with series 400Ω resistors clamp the SET pin to the

OUT pin. These diodes and resistors only carry current under transient

overloads. During normal operation, keep the OUT-to-SET differential

voltage below 2V.

Note 7: Load regulation is Kelvin sensed at the package.

Note 8: This IC includes overtemperature protection that protects the

device during momentary overload conditions. Junction temperature

exceeds the maximum operating junction temperature when

overtemperature protection is active. Continuous operation above the

specified maximum operating junction temperature may impair device

reliability.

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