LTM8032 datasheet(3/30 Pages) LINER

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LTM8003

8003fc

For more information www.linear.com/LTM8003

ELECTRICAL CHARACTERISTICS

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 noted, the absolute minimum voltage is zero.

Note 3: The LTM8003I is guaranteed to meet specifications over the full

–40°C to 125°C internal operating temperature range. The LTM8003H

is guaranteed to meet specifications over the full –40°C to 150°C

internal operating temperature range. Note that the maximum internal

temperature is determined by specific operating conditions in conjunction

with board layout, the rated package thermal resistance and other

environmental factors. High junction temperatures degrade operating

lifetimes. Operating lifetime is derated at junction temperatures greater

than 125°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

VIN Rising

3.4

Output DC Voltage

LTM8003, RFB Open

LTM8003, RFB = 5.62k, VIN = 40V

LTM8003-3.3

0.97

3.3

Peak Output DC Current

VOUT = 3.3V, fSW =1MHz

Quiescent Current into VIN

RUN = 0V

BIAS = 0V, No Load, SYNC = 0V, Not Switching

µA

Quiescent Current into BIAS

BIAS = 5V, RUN = 0V

BIAS = 5V, No Load, SYNC = 0V, Not Switching

BIAS = 5V, VOUT = 3.3V, IOUT = 3.5A, fSW =1MHz

µA

Line Regulation

5.5V < VIN < 36V, IOUT = 1A

0.5

Load Regulation

0.1A < IOUT < 3.5A

0.5

Output Voltage Ripple

IOUT = 3.5A

Switching Frequency

RT = 232k

RT = 41.2k

RT = 10.7k

200

0.95

kHz

MHz

Voltage at FB

LTM8003

950

970

980

Minimum BIAS Voltage

(Note 5)

3.2

RUN Threshold Voltage

0.9

1.06

RUN Current

µA

TR/SS Current

TR/SS = 0V

µA

TR/SS Pull Down

TR/SS = 0.1V

200

PG Threshold Voltage at FB (Upper)

FB Falling (Note 6, LTM8003)

1.05

PG Threshold Voltage at FB (Lower)

FB Rising (Note 6, LTM8003)

0.89

PG Threshold Voltage at VOUT (Upper)

VOUT Falling (Note 6, LTM8003-3.3)

3.57

PG Threshold Voltage at VOUT (Lower)

VOUT Rising (Note 6, LTM8003-3.3)

3.03

PG Leakage Current

PG = 42V

µA

PG Sink Current

PG = 0.1V

150

µA

SYNC Threshold Voltage

Synchronization

0.4

1.5

SYNC Voltage

To Enable Spread Spectrum

2.9

4.2

SYNC Current

SYNC = 0V

µA

The l denotes the specifications which apply over the specified operating

temperature range, otherwise specifications are at TJ = 25°C. VIN =12V, RUN = 2V, unless otherwise noted.

Note 4: The LTM8003 contains overtemperature protection that is

intended to protect the device during momentary overload conditions. The

internal temperature exceeds the maximum operating junction temperature

when the overtemperature protection is active. Continuous operation

above the specified maximum operating junction temperature may impair

device reliability.

Note 5: Below this specified voltage, internal circuitry will draw power

from VIN.

Note 6: PG transitions from low to high.

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