L99LD02Q505 STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
The L99LD02Q505 is a dual-phase boost DC/DC controller from STMicroelectronics supporting PWM and PFM control modes across a 5.5 V to 28 V input range in a QFN-32 package. It provides current-mode and voltage-mode control for high-efficiency power conversion in automotive applications. Available from stock worldwide with competitive pricing.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 33
- Lifecycle
- OBSOLETE
- Datasheet
- L99LD02Q505 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of L99LD02Q505?
- Dual-phase boost topology with PWM and PFM control reduces input ripple and improves light-load efficiency
- Wide 5.5 V to 28 V input voltage range covers automotive 12 V and 24 V battery systems
- Current-mode and voltage-mode control options enable flexible loop compensation for different load profiles
What is L99LD02Q505 used for?
The L99LD02Q505 is designed for automotive power conversion systems such as LED headlight drivers, ADAS sensor supplies, and infotainment DC/DC converters requiring dual-phase boost regulation from a 12 V or 24 V vehicle battery. Its PFM mode extends efficiency at light loads, making it suitable for always-on ECU power rails and stop-start vehicle architectures.
What are the specifications of L99LD02Q505?
| YTEOL | 0 |
| Additional Feature | ALSO HAS A CONTROL TECHNIQUE OF PFM. |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT/VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 28V |
| Input Voltage-Min | 5.5V |
| Input Voltage-Nom | 10V |
| JESD-30 Code | S-XQCC-N32 |
| Number of Functions | 1 |
| Output Voltage-Max | 80V |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC32,.2SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Screening Level | AEC-Q100 |
| Supply Current-Max (Isup) | 22mA |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 470kHz |
| Technology | CMOS |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Where can I find the L99LD02Q505 datasheet?
L99LD02Q505 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for L99LD02Q505?
Compatible alternatives and drop-in replacements for L99LD02Q505:
Switching Controller, Current/voltage-mode, 470kHz Switching Freq-Max, CMOS
Frequently Asked Questions
What input voltage range does the L99LD02Q505 support for automotive battery systems?
The L99LD02Q505 accepts input voltages from 5.5 V to 28 V, covering standard 12 V and 24 V automotive battery rails. This range accommodates cold-crank voltage dips below 6 V and load-dump transients up to 28 V, making the controller suitable for harsh under-hood automotive environments without additional protection circuitry.
How does the dual-phase boost architecture of the L99LD02Q505 improve power supply performance?
Operating two interleaved boost phases at 180 degrees out of phase reduces input and output current ripple by up to 50% compared to a single-phase design. This lowers EMI, reduces filter capacitor size, and improves transient response, which is critical for automotive ADAS and LED driver applications requiring tight output voltage regulation.
When should a designer choose the L99LD02Q505 over a single-phase boost controller for an automotive LED headlight application?
For LED headlight drivers demanding more than 20 W output from a 12 V rail, the dual-phase L99LD02Q505 distributes heat across 2 switch nodes, halves peak inductor currents, and meets CISPR 25 Class 5 EMI limits more easily than a single-phase alternative. Its QFN-32 package also provides better thermal dissipation in compact automotive lighting modules.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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