Datasheet LTM8042, LTM8042-1 (Analog Devices) - 3

LTM8042/LTM8042-1
ELECTRICAL CHARACTERISTICS 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 l 3 V ILED LTM8042 LED Current CTL Open 0.9 1.05 A RCTL = 6.81k 0.45 0.5 0.55 A LTM8042-1 LED Current CTL Open 0.34 0.39 A RCTL = 6.81k 0.17 0.20 A VCLAMP Open LED Clamp Voltage Boost Mode, LED+ Open 36 V ∆IOUT/IOUT Output Current Line Regulation LTM8042, 6V < BSTOUT/BKIN < 30V 0.5 % LTM8042-1, 6V < BSTOUT/BKIN < 30V 0.5 % IQVCC VCC Supply Current PWM = 0V 4.2 mA RUN = 0V 0.1 1 µA fSW Switching Frequency RT = 90.9k 0.22 0.25 0.27 MHz RT = 22.1k 0.68 0.8 0.92 MHz RT = 6.04k 1.7 2 2.3 MHz ISS Soft-Start Pin Current SS = 0.5V, Out of Pin 6 9 12 µA fSYNC Synchronization Frequency Range 0.3 2.5 MHz ISYNC SYNC Pull-Down Current (Into the Pin) VSYNC = 2V 60 µA VSYNC(IL) SYNC Input Low 0.4 V VSYNC(IH) SYNC Input High 1.5 V ICTL CTL Input Bias Current CTL = 0V, Flows Out of Pin 100 µA VRUN(IH) RUN Input Voltage High 1.5 V VRUN(IL) RUN Input Voltage Low 0.4 V IRUN RUN Pin Bias Current 60 100 µA VPWM(IH) PWM Input Voltage High 1.5 V VPWM(IL) PWM Input Voltage Low 0.4 V IPWM PWM Pin Bias Current 60 120 µA VTG(OH) TG Output High Voltage Relative to LED+, 100k from LED+ to TG 0 V VTG(OL) TG Output Low Voltage Relative to LED+, 100k from LED+ to TG –7 V VTGEN(IH) TGEN Input Voltage High PWM = 0V 1.5 V VTGEN(IL) TGEN Input Voltage Low 0.4 V ITGEN TGEN Pin Bias Current 100 200 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings The LTM8042I/LTM8042I-1 are guaranteed to meet specifications over may cause permanent damage to the device. Exposure to any Absolute the full –40°C to 125°C internal operating temperature range. Note that Maximum Rating condition for extended periods may affect device the maximum internal temperature is determined by specific operating reliability and lifetime. conditions in conjunction with board layout, the rated package thermal
Note 2:
Absolute maximum voltage at V resistance and other environmental factors. CC, RUN, PWM, TGEN, BSTIN/ BKLED– pins is 40V for non-repetitive one second transients and 30V for
Note 4:
This device includes overtemperature protection that is intended continuous operation. to protect the device during momentary overload conditions. Junction
Note 3:
The LTM8042E/LTM8042E-1 are guaranteed to meet performance temperature will exceed the maximum internal operating temperature specifications from 0°C to 125°C ambient. Specifications over the full when overtemperature protection is active. Continuous operation above –40°C to 125°C internal operating temperature range are assured by the specified maximum operating junction temperature may impair device design, characterization and correlation with statistical process controls. reliability. 80421fb For more information www.linear.com/LTM8042 3