LT3905EUD#TRPBF Analog Devices Integrated Circuit (Quad Flat No-Lead) In Stock
The LT3905EUD#TRPBF is an Analog Devices 60 V boost DC-DC converter with integrated APD current monitor, accepting 2.7 V to 12 V input and delivering up to 60 V output using current-mode PWM control in a compact QFN package. It also supports adjustable output mode for flexible optical receiver biasing. Available in stock worldwide with competitive pricing.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- LT3905EUD#TRPBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.5300(MOQ 19)
- Temp Range
- ?°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 60 V output boost conversion from 2.7 V to 12 V input enables single-supply biasing of avalanche photodiodes (APDs) in optical receivers and LiDAR systems
- Integrated APD current monitor provides accurate optical signal current readout without external transimpedance amplifier, reducing BOM and board area
- Current-mode PWM control with adjustable output mode supports stable bias regulation over temperature for precise APD gain control in fiber optic and sensing applications
Applications
The LT3905EUD#TRPBF is specifically designed for biasing avalanche photodiodes (APDs) in fiber optic receivers, optical time-domain reflectometers (OTDRs), and LiDAR proximity sensors where a stable high-voltage bias from a low-voltage supply rail is required. Its integrated APD current monitor simplifies received optical power measurement by providing a proportional current output that eliminates discrete monitoring circuitry. Industrial and medical optical sensing equipment benefit from its 2.7 V to 12 V input range and adjustable 60 V boost output, which accommodates a wide range of APD bias voltage requirements without redesigning the power supply stage.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1691 |
| YTEOL | 10 |
| Additional Feature | ALSO OPERATES IN ADJUSTABLE MODE |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 12V |
| Input Voltage-Min | 2.7V |
| Input Voltage-Nom | 3.3V |
| JESD-30 Code | S-PQCC-N16 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.45A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Current-Max (Isup) | 0.75mA |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 2200kHz |
| Technology | BIPOLAR |
| Temperature Grade | OTHER |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range and maximum output voltage does the LT3905EUD#TRPBF support?
The LT3905EUD#TRPBF accepts input voltages from 2.7 V to 12 V and boosts the output up to 60 V, which is the typical reverse bias voltage range required for avalanche photodiodes (APDs) in fiber optic receivers and LiDAR sensors. This wide input range allows the converter to operate from 3.3 V logic rails, single-cell Li-ion batteries, or regulated 5 V and 12 V bus supplies without additional pre-regulation.
How does the integrated APD current monitor in the LT3905EUD#TRPBF simplify optical receiver design?
The integrated APD current monitor in the LT3905EUD#TRPBF senses the reverse bias current flowing through the avalanche photodiode and provides a scaled current output proportional to received optical power. This eliminates the need for a separate transimpedance amplifier or precision current sense resistor in the APD bias circuit, reducing component count by 3 to 5 parts and saving up to 30 mm² of board area in compact optical receiver modules used in fiber-to-the-home and industrial sensing equipment.
Which optical sensing applications benefit from the LT3905EUD#TRPBF adjustable output mode?
The adjustable output mode of the LT3905EUD#TRPBF allows the APD bias voltage to be set across a range from approximately 10 V to 60 V using external resistor dividers, which is important for LiDAR range finders and OTDR instruments that must compensate for APD gain variation over -40°C to +85°C. By dynamically adjusting the bias voltage by 2 V to 5 V per 10°C change through a DAC-controlled feedback resistor, the system maintains consistent APD avalanche gain and detection sensitivity across the full operating temperature range.
What package does the LT3905EUD#TRPBF use, and how does it affect board space in optical module designs?
The LT3905EUD#TRPBF is housed in a compact QFN (Quad Flat No-Lead) package, which provides a small PCB footprint with exposed thermal pad for heat dissipation. The QFN form factor is typically 3 mm x 3 mm or 4 mm x 4 mm depending on pin count, enabling the 60 V boost converter and APD monitor to fit within the constrained board area of small form factor optical transceiver modules (SFP or QSFP) and handheld LiDAR sensor heads where board space is budgeted in single-digit square centimeters.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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