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L99LD02Q505TR

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Dual-phase boost DC/DC controller

Quantity $ per Unit Savings
1 - 9$2.470%
10 - 24$2.2310%
25 - 50$2.1115%
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$2.47
Parameter NameParameter Value
Operating RangeAutomotive
Supply Voltage Min Volt5.5
Supply Voltage Max Volt28.0
Operating Temp Min Celsius150.0
Operating Temp Max Celsius-40.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack2
GradeAutomotive
Package NameQFN-32L WF

The L99LD02 is a two phase, constant frequency, current mode boost controller that drives N-channel power MOSFETs.


Multi-phase operation is supported by SYNC I/O pin, providing the phase shifted clock signal. The boost controllers of more devices can be stacked, in order to operate in multi-phase for high power applications.


Multi-phase operation reduces system filtering capacitance and inductance requirements.


The operating frequency is configurable via SPI between 100 kHz and 470 kHz.


Other features include an internal 10 V LDO for the gate drivers, soft-start, gate driver supply option from boost output and pre-configurable operation in limp home.

Key features
  • AEC-Q100 qualified
  • General
    • 32 bit ST SPI communication v4.1
    • Stand-alone operation supported
    • QFN-32L 5x5 with exposed pad
    • Timeout watchdog and limp home function
  • Boost section
    • Wide input range: 3 V to 28 V operation
    • Adjustable boost output voltage - up to 80 V
    • 10 V Gate Driver supply for Standard-Level MOSFETs
    • Gate driver supply option from boost output
    • Internal 10 V LDO regulator
    • Fixed frequency architecture -programmable by SPI
    • Peak current mode control with programmable Input Current Limitation
    • Constant voltage regulation
    • Adjustable Slope Compensation
    • Soft start
    • Multi-phase operation - up to 4-phase supported
    • SYNC I/O pin for multi-phase operation support
    • Adjustable clock distribution and phase shift
    • Programmable error amplifier gain
    • Fully configurable in limp home
    • Protection and diagnostic
    • Boost functionality guaranteed in Cold Cranking
    • Input overcurrent protection - programmable by SPI
    • Thermal warning
    • Thermal shutdown
    • Overvoltage protection (OVP)