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Analog Devices Inc. LT3482IUD#TRPBF
- Part No.:
- LT3482IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LT3482IUD#TRPBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,046
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Product details
Overview
LT3482IUD#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 for biasing 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 LT3482IUD#TRPBF datasheet, LT3482IUD#TRPBF pinout, LT3482IUD#TRPBF application, or LT3482IUD#TRPBF equivalent, key selection criteria include APD bias stability under temperature variation, high-side current monitor linearity at low photocurrents, dual-output voltage doubling architecture, and QFN-16 thermal performance in compact optical modules.
Technical Context
The LT3482IUD#TRPBF employs constant-frequency current-mode control with internal ramp compensation and a 1.235V reference (adjustable via CTRL pin), enabling precise regulation of high-voltage APD bias while maintaining predictable EMI profiles. Its functional block includes integrated Schottky diodes for both boost and charge-pump paths, eliminating external diodes and reducing solution footprint.
It integrates a 5:1 high-side APD current mirror with MONIN pin rated to 90V and MON output clamped at 11.5V, supporting closed-loop APD bias control through external resistor feedback. The device operates across –40°C to 125°C and uses internal compensation-no external compensation network required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Up to 90V - supports full bias range for high-gain APDs in fiber optic receivers. |
| 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 for APD load transients. |
| Switching Frequency | 650kHz or 1.1MHz (fSET-selectable) - enables trade-off between component size and efficiency. |
| APD Monitor Accuracy | Better than ±10% over –40°C to 125°C - ensures stable gain calibration in uncontrolled environments. |
| Feedback Reference | 1.235V (internal) or externally adjustable via CTRL pin - allows dynamic APD voltage tuning without polarity inversion. |
| Shutdown Current | <1µA - preserves battery life in portable optical sensing applications. |
Pinout & Package
LT3482IUD#TRPBF is housed in a thermally enhanced 3mm × 3mm 16-lead plastic QFN package with exposed pad (Pin 17) soldered to PCB ground for optimal thermal dissipation (θJA = 68°C/W). The package supports reflow assembly and meets JEDEC MO-220 WEED-2 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| APD (Pin 2) | APD cathode connection node | High-side current sense input; accepts up to 90V common-mode voltage for direct APD integration. |
| MONIN (Pin 3) | Monitor supply input | Provides bias for internal current mirror; requires external RC filter to suppress supply ripple affecting monitor accuracy. |
| VOUT2 (Pin 4) | Voltage doubler output | Forms second stage of charge pump with VOUT1 and internal Schottky diodes to reach 90V output. |
| VOUT1 (Pin 5) | Main boost output | Primary regulated high-voltage rail; connects to flying capacitor (CFLY) and output divider for FB loop. |
| PUMP (Pin 6) | Charge pump node | Completes voltage-doubling path with SW and internal Schottky; must be decoupled with 50V-rated capacitor. |
| SW (Pins 7, 8) | Power switch drain terminals | Drives external inductor; dual pins reduce trace inductance and improve EMI performance. |
| GND (Pins 9, 10) | Ground return paths | Internally connected; both must be tied to low-impedance PCB ground plane for thermal and noise control. |
| VIN (Pin 11) | Input power supply | Accepts 2.5V–16V; requires local 1µF ceramic bypass capacitor placed adjacent to pin. |
| SHDN (Pin 12) | Enable/shutdown control | Logic-level input: ≥1.5V enables operation and initiates soft-start; ≤0.4V disables with <1µA quiescent current. |
| CTRL (Pin 13) | Reference override | Adjusts FB threshold from 0V to 1.2V; enables real-time APD voltage tuning without changing resistor divider. |
| FB (Pin 14) | Feedback input | Senses resistor divider output; 30nA bias current minimizes divider error and power loss. |
| fSET (Pin 15) | Frequency select | Tie to GND for 650kHz; tie to VIN or ≥1.5V for 1.1MHz - selects inductor/capacitor size vs. efficiency trade-off. |
| MON (Pin 16) | Current monitor output | Sources 20% of APD current (IMON = 0.2 × IAPD); converts to voltage via external RMON for analog monitoring. |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Mandatory PCB solder connection; provides primary thermal path and reduces junction-to-board resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated voltage doubler | Enables 90V output using only one inductor and two internal Schottky diodes - eliminates external charge-pump IC and reduces BOM count by 4+ components. |
| High-side APD current monitor | Delivers 20% mirrored current (IMON) with ±10% accuracy over –40°C to 125°C and 250nA–2.5mA dynamic range - supports closed-loop bias control in temperature-varying optical modules. |
| Selectable switching frequency | 650kHz or 1.1MHz via fSET pin - allows optimization of inductor size (e.g., 10µH @ 650kHz vs. 6.8µH @ 1.1MHz) without redesigning feedback or compensation. |
| Internal compensation | Eliminates need for external Type-II/III compensation network - simplifies layout, improves production yield, and guarantees stability across all operating conditions. |
| Soft-start and shutdown | SHDN pin provides controlled enable/disable with built-in soft-start (1.5V–2V transition) - prevents inrush current spikes and protects APD during power cycling. |
Applications
| Fiber Optic Receiver Modules | Optical Time-Domain Reflectometers (OTDR) |
|---|---|
|
Use Scenario: Biasing InGaAs APDs in 10G/25G SFP+ and QSFP transceivers operating at –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC converter generating stable 70V–90V bias; monitors APD current for automatic gain control (AGC) feedback. Use Value: Maintains ±10% APD current accuracy across temperature, enabling consistent receiver sensitivity without factory recalibration. |
Use Scenario: Powering APDs in handheld OTDR test equipment requiring rapid on/off cycling and low standby power. IC Role / Device Role / Timing Role: High-efficiency boost converter with <1µA shutdown current and programmable output voltage via CTRL pin for pulse-width-modulated bias control. Use Value: Extends battery life >20 hours per charge while delivering fast transient response (<500ns) to APD current step changes. |
| LiDAR Signal Conditioning | Medical Optical Sensors |
|
Use Scenario: Biasing silicon APDs in short-range automotive LiDAR systems where EMI must be minimized near radar receivers. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller with predictable 650kHz noise spectrum; input free from switching noise due to inductor-based topology. Use Value: Enables clean analog front-end design without additional filtering, reducing total solution size by 30% versus flyback alternatives. |
Use Scenario: Providing calibrated APD bias in portable blood oximetry and fluorescence detection instruments with strict leakage current limits. IC Role / Device Role / Timing Role: Low-noise, high-side current monitor with 250nA minimum detectable current and 0.1µF APD pin capacitor for noise suppression. Use Value: Achieves sub-nA measurement resolution critical for detecting weak biological fluorescence signals in clinical-grade devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar APD bias converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3443EDE#TRPBF | Lower max output (40V), no integrated voltage doubler, 1.2MHz fixed frequency, no APD current monitor. | Suitable for PIN diode bias or low-voltage APDs; lacks closed-loop monitoring for gain stabilization. | Choose when output ≤40V suffices and external current sensing is acceptable. |
| MAX5026ETE+T | 60V max output, no APD monitor, external compensation required, 500kHz–2MHz adjustable frequency. | Requires external Schottky diodes and compensation network; higher design complexity and board area. | Prefer when custom loop shaping is needed and thermal constraints allow larger solution size. |
Compared with LTC3443EDE#TRPBF and MAX5026ETE+T, the LT3482IUD#TRPBF uniquely integrates voltage doubling, high-side APD current monitoring, and internal compensation - delivering a complete, space-constrained APD bias solution with no external diodes or compensation components required.
Availability
LT3482IUD#TRPBF is available at Aetrix Electronics and suitable for fiber optic transceivers, optical time-domain reflectometers, LiDAR signal chains, and medical optical sensors requiring stable component supply across extended temperature ranges.
Supply support for LT3482IUD#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT3482 series.
The LT3482IUD#TRPBF belongs to Linear's precision high-voltage DC/DC converter family, engineered specifically for optical receiver biasing where APD current monitoring, voltage doubling, and thermal reliability in compact QFN packages are essential.
FAQ
What is the maximum output voltage achievable with the LT3482IUD#TRPBF?
The LT3482IUD#TRPBF supports up to 90V output using its integrated voltage doubler architecture, combining VOUT1 and VOUT2 with internal Schottky diodes and external flying capacitors. This is confirmed in the Absolute Maximum Ratings table and validated in Typical Application circuits TA01a and TA02a, where 85V and 70V outputs are demonstrated at 2.5mA and 2mA APD loads respectively.
How does the LT3482IUD#TRPBF achieve APD current monitoring accuracy across temperature?
The LT3482IUD#TRPBF achieves better than ±10% relative accuracy over –40°C to 125°C using a matched high-side current mirror with trimmed gain and temperature-compensated biasing. Electrical Characteristics tables specify this accuracy applies across the full operating range (denoted by ●), and Figure G06 confirms <±2% error drift over temperature at IAPD = 250nA, 10µA, and 2.5mA.
Can the LT3482IUD#TRPBF operate without external compensation components?
Yes, the LT3482IUD#TRPBF features internal compensation, eliminating the need for external Type-II or Type-III networks. This is explicitly stated in the FEATURES list and verified in the Functional Diagram (page 6), where no external compensation nodes appear. Stability is guaranteed across all input/output conditions per the datasheet's internal compensation guarantee.
What is the role of the CTRL pin in the LT3482IUD#TRPBF, and how does it affect regulation?
The CTRL pin on the LT3482IUD#TRPBF overrides the internal 1.235V reference, allowing the FB pin to regulate to any voltage between 0V and 1.2V. When CTRL = 0.5V, the FB pin regulates to 0.5V ±15mV (per Electrical Characteristics), enabling dynamic APD voltage adjustment. Holding CTRL >1.5V reverts to the internal reference - confirmed in the Pin Functions section and Figure F01.
Is the LT3482IUD#TRPBF pin-compatible with other variants in the LT3482 family?
Yes, the LT3482IUD#TRPBF shares identical pinout, package (16-lead 3mm × 3mm QFN), and footprint with LT3482EUD#PBF, LT3482EUD#TRPBF, and LT3482IUD#PBF - all listed under the same UD PACKAGE description with identical Pin Configuration diagrams and mechanical drawings (page 11). Only temperature grade and packaging differ.
LT3482IUD#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)
LT3482IUD#TRPBF FAQ
1.How can I place an order for LT3482IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3482IUD#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 LT3482IUD#TRPBF reliable?
The price and inventory of LT3482IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3482IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3482IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3482IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3482IUD#TRPBF?
LT3482IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3482IUD#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 LT3482IUD#TRPBF?
For technical support, including LT3482IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3482IUD#TRPBF requirements.
6.How does Aetrix verify that LT3482IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3482IUD#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 LT3482IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3482IUD#TRPBF?
All LT3482IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3482IUD#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 LT3482IUD#TRPBF part is unused and in its original packaging.
Return procedure for LT3482IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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