LTM8042EVPBF datasheet(3/32 Pages) LINER

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LTM8042/LTM8042-1

80421fa

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: Absolute maximum voltage at VCC, RUN, PWM, TGEN, BSTIN/

BKLED– pins is 40V for non-repetitive one second transients and 30V for

continuous operation.

Note 3: The LTM8042E/LTM8042E-1 are guaranteed to meet performance

specifications from 0°C to 125°C ambient. 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

l denotes the specifications which apply over the full internal

operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, buck mode with 4Ω load.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC(MIN)

Minimum Input DC Voltage

ILED

LTM8042 LED Current

LTM8042-1 LED Current

CTL Open

CTL Open, RCTL = 6.81k

RCTL = 6.81k

0.9

0.45

0.34

0.17

0.5

1.05

0.55

0.39

0.20

VCLAMP

Open LED Clamp Voltage

Boost Mode, LED+ Open

ΔIOUT/IOUT

Output Current Line Regulation

LTM8042, 6V < BSTOUT/BKIN < 30V

LTM8042-1, 6V < BSTOUT/BKIN < 30V

0.5

IQVCC

VCC Supply Current

PWM = 0V

RUN = 0V

4.2

0.1

μA

fSW

Switching Frequency

RT = 90.9k

RT = 22.1k

RT = 6.04k

0.22

0.68

1.7

0.25

0.8

0.27

0.92

2.3

MHz

ISS

Soft-Start Pin Current

SS = 0.5V, Out of Pin

μA

fSYNC

Synchronization Frequency Range

0.3

2.5

MHz

ISYNC

SYNC Pull-Down Current (Into the Pin)

VSYNC = 2V

μA

VSYNC(IL)

SYNC Input Low

0.4

VSYNC(IH)

SYNC Input High

1.5

ICTL

CTL Input Bias Current

CTL = 0V, Flows Out of Pin

100

μA

VRUN(IH)

RUN Input Voltage High

1.5

VRUN(IL)

RUN Input Voltage Low

0.4

IRUN

RUN Pin Bias Current

100

μA

VPWM(IH)

PWM Input Voltage High

1.5

VPWM(IL)

PWM Input Voltage Low

0.4

IPWM

PWM Pin Bias Current

120

μA

VTG(OH)

TG Output High Voltage

Relative to LED+, 100k from LED+ to TG

VTG(OL)

TG Output Low Voltage

Relative to LED+, 100k from LED+ to TG

–7

VTGEN(IH)

TGEN Input Voltage High

PWM = 0V

1.5

VTGEN(IL)

TGEN Input Voltage Low

0.4

ITGEN

TGEN Pin Bias Current

100

200

μA

The LTM8042I/LTM8042I-1 are 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: This device includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed the maximum internal operating temperature

when overtemperature protection is active. Continuous operation above

the specified maximum operating junction temperature may impair device

reliability.

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