LTM8021 datasheet(3/28 Pages) LINER

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LTM8053

8053fc

For more information www.linear.com/LTM8053

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified internal

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

VIN Rising

3.4

Output DC Voltage

RFB Open

RFB = 16.9k, VIN = 40V

0.97

Peak Output DC Current

VOUT = 3.3V, fSW = 1MHz

Quiescent Current Into VIN

RUN = 0V

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

300

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

275

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

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)

1.05

PG Threshold Voltage at FB (Lower)

FB Rising (Note 6)

0.89

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

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 LTM8053E is guaranteed to meet performance specifications

from 0°C to 125°C internal. Specifications over the full –40°C to

125°C internal operating temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTM8053I is guaranteed to meet specifications over the full –40°C to

125°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.

Note 4: The LTM8053 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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