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Analog Devices Inc. LT3482EUD#TRPBF
- Part No.:
- LT3482EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LT3482EUD#TRPBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
LT3482EUD#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency current-mode boost DC/DC converter with integrated voltage doubler and high-side APD current monitor, designed specifically to bias avalanche photodiodes in optical receivers. It delivers up to 90V output from 2.5V–16V input, features 280mA internal switch, 650kHz/1.1MHz selectable switching frequency, and ±10% APD current monitoring accuracy across four decades (250nA–2.5mA).
For engineers reviewing the LT3482EUD#TRPBF datasheet, LT3482EUD#TRPBF pinout, LT3482EUD#TRPBF application, or LT3482EUD#TRPBF equivalent, key selection criteria include APD bias stability under temperature variation, high-voltage output ripple control, programmable feedback via CTRL pin, and compatibility with compact 3mm × 3mm QFN layout constraints.
Technical Context
The LT3482EUD#TRPBF employs constant-frequency current-mode control with internal ramp compensation, enabling predictable EMI behavior and stable regulation across wide input/output ratios. Its dual-output architecture integrates a primary boost stage (VOUT1/SW) and charge-pump doubler (VOUT2/PUMP), both leveraging on-chip Schottky diodes to minimize external component count.
APD current sensing is implemented via a high-side current mirror with 5:1 gain (20% scaling), referenced to MONIN (up to 90V), and clamped at 11.5V on MON output. The CTRL pin allows real-time adjustment of FB reference from 0V to 1.2V-enabling dynamic APD voltage tuning without polarity inversion-while internal compensation eliminates need for external loop components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Up to 90V - supports high-gain APD operation in fiber optic receivers and LIDAR front-ends. |
| Input Voltage Range | 2.5V to 16V - compatible with single-cell Li-ion, 3.3V/5V/12V system rails. |
| Switch Current Limit | 280mA typical - sets maximum power delivery capability while limiting inrush during startup. |
| Switching Frequency | 650kHz or 1.1MHz (fSET-selectable) - enables trade-off between component size (smaller L/C at 1.1MHz) and efficiency/duty cycle headroom. |
| APD Monitor Accuracy | Better than ±10% over –40°C to 85°C - ensures reliable photocurrent feedback for closed-loop bias control. |
| Feedback Reference | 1.235V internal or externally adjustable via CTRL (0–1.2V) - allows precise, digitally programmable APD voltage setting. |
| Shutdown Current | <1µA - preserves battery life in portable optical modules during standby. |
Pinout & Package
LT3482EUD#TRPBF is housed in a thermally enhanced 16-lead 3mm × 3mm plastic QFN package with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. Package meets JEDEC MO-220 WEED-2 outline standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| APD (Pin 2) | High-side APD cathode connection | Direct interface to photodiode cathode; requires series 20Ω resistor for short-circuit protection. |
| MONIN (Pin 3) | APD monitor supply input | Accepts up to 90V; powers internal current mirror and enables low-pass filtering for noise reduction. |
| VOUT2 (Pin 4) | Voltage doubler output | Connects to flying capacitor (CFLY) and VOUT1 to generate second-stage boost; rated for 90V. |
| VOUT1 (Pin 5) | Main boost output | Primary regulated high-voltage rail; connects to output capacitor and feedback divider. |
| PUMP (Pin 6) | Charge pump node | Completes voltage-doubling path with internal Schottky diodes and external CFLY capacitor. |
| SW (Pins 7, 8) | Power switch drain | Drives external inductor; dual pins reduce EMI and improve current handling. |
| GND (Pins 9, 10) | Power and signal ground | Internally connected; both must be tied to low-impedance PCB ground plane. |
| VIN (Pin 11) | Input supply | 2.5V–16V input; requires local 1µF ceramic bypass capacitor. |
| SHDN (Pin 12) | Enable/soft-start control | Logic-high (>1.5V) enables device; voltage ramp between 1.5V–2V controls soft-start timing. |
| CTRL (Pin 13) | Reference override | Sets FB threshold from 0V to 1.2V; enables dynamic APD voltage adjustment without hardware change. |
| FB (Pin 14) | Feedback input | Compares resistor-divider output against internal 1.235V or CTRL-set reference for regulation. |
| fSET (Pin 15) | Frequency selection | GND = 650kHz; >1.5V = 1.1MHz - selects inductor/capacitor sizing strategy. |
| MON (Pin 16) | APD current monitor output | Sources 20% of APD current; converts to voltage via external RMON for analog/digital readout. |
| Exposed Pad (Pin 17) | Thermal & electrical GND | Mandatory solder connection to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated voltage doubler | Enables 90V output using only one inductor and two small capacitors-reducing BOM count and board area vs. cascaded converters. |
| High-side APD current monitor | Delivers 20% scaled current output (MON) with ±10% accuracy over –40°C to 85°C and 250nA–2.5mA range-supporting closed-loop bias control in optical receivers. |
| Selectable switching frequency | 650kHz or 1.1MHz via fSET pin-allows optimization for efficiency (lower f) or miniaturization (higher f) without redesigning magnetics. |
| CTRL pin programmable reference | Permits real-time adjustment of regulated output voltage by varying CTRL from 0V to 1.2V-enabling digital APD bias tuning without changing resistor dividers. |
| Internal compensation | Eliminates need for external compensation network-simplifies design, improves production consistency, and reduces layout sensitivity. |
| Low shutdown current | <1µA quiescent draw in shutdown-critical for battery-powered optical modules requiring long standby duration. |
Applications
| Fiber Optic Receiver Bias | LIDAR Transceiver Module |
|---|---|
|
Use Scenario: Biasing APDs in 10Gbps+ SFP+ and QSFP optical transceivers operating in telecom/datacom infrastructure. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC converter generating stable 70–90V APD bias with low-noise current monitoring for automatic gain control (AGC). Use Value: Integrated doubler and high-side monitor eliminate discrete HV stages and external sense resistors-reducing solution size by >40% and improving temperature stability of bias point. |
Use Scenario: Powering APDs in pulsed time-of-flight (ToF) LIDAR systems used in autonomous vehicles and industrial scanning. IC Role / Device Role / Timing Role: Provides fast-settling, digitally tunable APD bias voltage synchronized with laser pulse timing; MON output feeds real-time gain calibration circuitry. Use Value: CTRL pin programmability enables dynamic bias adjustment per pulse-compensating for temperature drift and aging without firmware update or hardware change. |
| Medical Pulse Oximetry Sensor | Industrial Optical Smoke Detector |
|
Use Scenario: Biasing low-capacitance APDs in portable pulse oximeters requiring ultra-low power consumption and high SNR. IC Role / Device Role / Timing Role: Generates 40–60V APD bias from coin-cell or single Li-ion supply; MON output interfaces directly with low-power ADC for ambient light rejection. Use Value: Sub-1µA shutdown current extends battery life beyond 12 months; integrated Schottky diodes prevent reverse leakage that would degrade dark-current measurement. |
Use Scenario: Providing stable APD bias in harsh-environment smoke detectors deployed in HVAC ducts and industrial facilities. IC Role / Device Role / Timing Role: Delivers robust 85V bias under wide temperature (–40°C to 85°C) and input voltage (3.3V–12V) variation; MON signal validates APD health during self-test cycles. Use Value: Guaranteed ±10% monitor accuracy across full temp range ensures reliable fault detection-meeting UL 217 and EN 54-7 compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar APD bias converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3461AEDD#TRPBF | Max output 38V; no voltage doubler; 300mA switch; 1.3MHz fixed frequency. | Restricted to lower-voltage PIN diodes or low-gain APDs; lacks MONIN/MON monitoring path. | Choose when output ≤38V suffices and APD current monitoring is handled externally. |
| LT3573EDE#TRPBF | 90V capable; no integrated APD monitor; requires external current-sense resistor and amplifier; 2.2MHz switching. | Higher component count and layout complexity; MON function must be added discretely. | Prefer when higher switching frequency justifies added design effort and cost for smaller magnetics. |
Compared with LT3482EUD#TRPBF, LT3461AEDD#TRPBF trades voltage range and monitoring integration for smaller footprint and lower cost in sub-40V applications, while LT3573EDE#TRPBF offers higher frequency but demands external sensing-making LT3482EUD#TRPBF optimal for compact, self-contained APD bias designs requiring guaranteed monitoring accuracy.
Availability
LT3482EUD#TRPBF is available at Aetrix Electronics and suitable for fiber optic transceivers, LIDAR modules, medical optical sensors, and industrial smoke detectors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3482EUD#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and power management product lines. Linear pioneered high-performance DC/DC converters for demanding signal-chain applications.
The LT3482EUD#TRPBF belongs to Linear's specialized optical bias converter family, engineered to address the stringent noise, accuracy, and voltage-range requirements of avalanche photodiode circuits in high-speed communication and sensing systems.
FAQ
What is the maximum output voltage supported by the LT3482EUD#TRPBF?
The LT3482EUD#TRPBF supports up to 90V output voltage, achieved through its integrated voltage doubler architecture combining VOUT1 and VOUT2 outputs. This rating applies across the full operating temperature range (–40°C to 85°C) and is validated with proper external component selection-including 50V-rated flying and output capacitors-and adherence to layout guidelines for high-voltage isolation.
How does the APD current monitor in the LT3482EUD#TRPBF achieve ±10% accuracy?
The LT3482EUD#TRPBF achieves better than ±10% relative accuracy in APD current monitoring over temperature and four decades of dynamic range (250nA to 2.5mA) via a matched high-side current mirror with 5:1 gain and dedicated MONIN supply pin. Internal trimming and process compensation ensure this accuracy holds across –40°C to 85°C without external calibration-critical for stable AGC in optical receivers.
Can the LT3482EUD#TRPBF operate from a 3.3V input to generate 85V output?
Yes, the LT3482EUD#TRPBF operates from 2.5V to 16V input and can generate 85V output-for example, in the 3.3V-to-85V APD bias reference design (Typical Application TA03a). Achieving this requires proper inductor selection (e.g., 6.8µH with ≥300mA saturation current), correct capacitor ratings (≥100V for VOUT2 path), and strict adherence to layout rules for high dV/dt nodes to maintain stability and efficiency.
What is the role of the CTRL pin in the LT3482EUD#TRPBF, and how is it used?
The CTRL pin in the LT3482EUD#TRPBF serves as an external reference override input that sets the FB pin regulation threshold between 0V and 1.2V-enabling real-time, polarity-inversion-free adjustment of the output voltage. When CTRL is held above 1.5V (e.g., tied to VIN), the internal 1.235V reference is used; when biased between 0V and 1.2V, the output regulates to match that voltage at FB, allowing digital APD bias tuning.
Is the LT3482EUD#TRPBF pin-compatible with other members of the LT3482 family?
Yes, the LT3482EUD#TRPBF shares identical pinout and package (16-lead 3mm × 3mm QFN) with LT3482EUD#PBF, LT3482IUD#PBF, and LT3482IUD#TRPBF. Differences lie solely in temperature grade (E-grade: 0°C to 85°C; I-grade: –40°C to 125°C) and packaging format (tape-and-reel vs. tray), not electrical or mechanical interface-enabling drop-in replacement within same grade and packaging requirements.
LT3482EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost, Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 90V
- Current - Output:
- 280mA (Switch)
- Frequency - Switching:
- 650kHz ~ 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LT3482EUD#TRPBF FAQ
1.How can I place an order for LT3482EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3482EUD#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3482EUD#TRPBF reliable?
The price and inventory of LT3482EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3482EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3482EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3482EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3482EUD#TRPBF?
LT3482EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3482EUD#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3482EUD#TRPBF?
For technical support, including LT3482EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3482EUD#TRPBF requirements.
6.How does Aetrix verify that LT3482EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3482EUD#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3482EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3482EUD#TRPBF?
All LT3482EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3482EUD#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3482EUD#TRPBF part is unused and in its original packaging.
Return procedure for LT3482EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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