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LTM8055

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For more information www.linear.com/LTM8055

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. RUN = 1.5V unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

VIN = SVIN

5.0

Output DC Voltage

FB = VOUT Through 100k

RFB = 100k/3.40k

1.2

Output DC Current

VIN = 6V, VOUT = 12V

VIN = 24V, VOUT = 12V

8.5

Quiescent Current Into VIN (Tied to SVIN)

RUN = 0.3V (Disabled)

No Load, MODE = 0.3V (DCM)

No Load, MODE = 1.5V (FCM)

0.1

100

µA

Output Voltage Line Regulation

5V < VIN < 36V, IOUT = 1A

0.5

Output Voltage Load Regulation

VIN = 12V, 0.1A < IOUT < 6A

0.5

Output RMS Voltage Ripple

VIN = 12V, IOUT = 3A

Switching Frequency

RT = 453k

RT = 24.9k

100

800

kHz

Voltage at FB Pin

1.188

1.176

1.2

1.212

1.220

RUN Falling Threshold

LTM8055 Stops Switching

1.15

1.25

RUN Hysteresis

LTM8055 Starts Switching

RUN Low Threshold

LTM8055 Disabled

0.3

RUN Pin Current

RUN = 1V

RUN = 1.6V

100

µA

IIN Bias Current

µA

Input Current Sense Threshold (IIN-VIN)

IOUT Bias Current

µA

Output Current Sense Threshold (VOUT-IOUT)

VCTL = Open

54.5

61.5

IINMON Voltage

LTM8055 in Input Current Limit

0.96

1.04

IOUTMON Voltage

LTM8055 in Output Current Limit

1.14

1.26

CTL Input Bias Current

VCTL = 0V

µA

SS Pin Current

VSS = 0V

µA

CLKOUT Output High

10k to GND

CLKOUT Output Low

10k to 5V

0.7

SYNC Input Low Threshold

0.3

SYNC Input High Threshold

1.5

SYNC Bias Current

SYNC = 1V

µA

MODE Input Low Threshold

0.3

MODE Input High Threshold

1.5

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: The LTM8055E 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

LTM8055I is guaranteed to meet specifications over the full –40°C

to 125°C internal operating temperature range. The LTM8055MP is

guaranteed to meet specifications over the full –55°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 3: The LTM8055 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.

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