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Analog Devices Inc. LT3506AEDHD#PBF
- Part No.:
- LT3506AEDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3506AEDHD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:208
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Product details
Overview
LT3506AEDHD#PBF from Analog Devices (formerly Linear Technology) is a dual monolithic current-mode PWM step-down DC/DC converter with integrated 2A bipolar NPN power switches, designed for high-density dual-rail power supplies in DSP, disk drive, and broadband modem applications. It delivers two independent 1.6A outputs, operates from 3.6V to 25V input, features 1.1MHz fixed switching frequency, anti-phase operation to reduce input ripple, and independent power-good indicators for sequencing.
For engineers reviewing the LT3506AEDHD#PBF datasheet, LT3506AEDHD#PBF pinout, LT3506AEDHD#PBF application, or LT3506AEDHD#PBF equivalent, key selection considerations include its dual 1.6A output capability, 1.1MHz switching frequency enabling compact magnetics, ±1% 0.8V reference accuracy, thermal shutdown and frequency foldback protection, and compatibility with ceramic output capacitors for low-ripple regulation.
Technical Context
The LT3506AEDHD#PBF implements constant-frequency current-mode control with shared master oscillator and independent slave oscillators per channel, enabling precise duty-cycle regulation and fast transient response. Its bipolar NPN internal switches require external BOOST capacitor-diode networks to achieve full saturation, and slope compensation ensures stability at high duty cycles.
Anti-phase switching (180° phase shift between channels) minimizes input RMS current and reduces bulk capacitance requirements. The device integrates independent soft-start, shutdown, error amplifiers (gm = 350 μMhos), and open-collector power-good comparators referenced to 90% of FB voltage (720 mV threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports 4-cell Li-ion, 5V logic rails, unregulated wall adapters, and lead-acid batteries. |
| Switching Frequency | 1.1MHz - enables use of sub-3μH inductors (e.g., 2.2μH) and <10μF ceramic output caps for space-constrained designs. |
| Output Current per Channel | 1.6A continuous - guaranteed with proper thermal layout and inductor selection (e.g., Sumida CR43-4R7 or Coilcraft DO1606T-222). |
| Feedback Reference Voltage | 0.8V ±1% - sets output voltage via resistor divider; enables accurate 1.2V, 1.8V, 3.3V, or 5V rails with minimal drift over temperature. |
| Power-Good Threshold | FB ≥ 720mV - open-collector PG pins assert high when output reaches 90% of target, easing microcontroller/DSP supply sequencing. |
| Thermal Shutdown | 125°C junction - protects against sustained overload or poor PCB thermal design; auto-recovery after cooldown. |
| Quiescent Current | 4.8mA typical - measured at VIN=5V with both regulators active; enables efficient light-load operation in always-on systems. |
Pinout & Package
LT3506AEDHD#PBF is housed in a thermally enhanced 16-lead (5mm × 4mm) plastic DFN package with exposed pad (Pin 17) that must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 / FB2 (Pins 16, 9) | Feedback Input | Regulates output to 0.8V; connects to resistor divider tap - determines VOUT = 0.8V × (1 + R1/R2). |
| VC1 / VC2 (Pins 15, 10) | Error Amplifier Output | Controls peak switch current; used for loop compensation or override shutdown by pulling to GND. |
| PGOOD1 / PGOOD2 (Pins 14, 11) | Open-Collector Power-Good | Asserts high when respective FB ≥ 720mV; requires external pull-up for sequencing with µC/DSP. |
| RUN/SS1 / RUN/SS2 (Pins 13, 12) | Enable & Soft-Start Control | Pull low to disable; capacitor to GND sets soft-start ramp time and limits inrush current. |
| SW1 / SW2 (Pins 2, 7) | Switch Node | Connects to inductor, catch diode anode, and BOOST capacitor - carries high di/dt switching current. |
| BOOST1 / BOOST2 (Pins 1, 8) | Bootstrap Drive Supply | Must be ≥1.5V above respective SW pin; generated via external diode + capacitor for NPN switch saturation. |
| VIN1 (Pins 3, 4) / VIN2 (Pins 5, 6) | Input Power Inputs | VIN1 powers internal bias regulator and SW1 path; VIN2 powers SW2 path - may be tied together or isolated. |
| GND (Pin 17 Exposed Pad) | Ground Reference & Thermal Path | Electrically and thermally critical - must be solidly soldered to large PCB copper area for reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual anti-phase 1.1MHz switching | Reduces input ripple current by ~30% vs. in-phase operation - cuts required input capacitance and EMI filtering. |
| Integrated 2A bipolar NPN switches | Eliminates external MOSFETs and drivers; enables complete dual 1.6A solution in <1 cm² footprint with DFN package. |
| Independent shutdown & soft-start | Enables staggered power-up of dual rails - prevents inrush overload on shared input source or upstream converters. |
| Accurate 0.8V ±1% reference | Supports tight-tolerance output rails (e.g., 1.8V ±18mV) without trimming; stable over –40°C to 85°C operating range. |
| Frequency foldback under fault | Reduces switching frequency to ~170kHz during short-circuit or overload - limits power dissipation and thermal stress. |
Applications
| DSP Power Supplies | Disk Drive Electronics |
|---|---|
Use Scenario: Powering dual-core DSPs requiring separate 1.2V core and 3.3V I/O rails with strict sequencing and low noise. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing regulated, sequenced, and monitored power rails. Use Value: Independent PGOOD signals enable safe boot sequence; 1.1MHz operation minimizes inductor size for portable form factors. |
Use Scenario: Supplying spindle motor driver (12V), preamp (5V), and servo controller (3.3V) in 2.5" HDDs with limited board area. IC Role / Device Role / Timing Role: High-efficiency dual-output DC/DC converter delivering tightly regulated rails from 19V adapter input. Use Value: Anti-phase switching reduces input capacitor count; thermal robustness supports continuous operation in enclosed drives. |
| DSL/Cable Modems | Wall Transformer Regulation |
Use Scenario: Generating 1.8V PHY and 3.3V MAC rails in broadband access equipment powered from 12V–24V AC/DC adapters. IC Role / Device Role / Timing Role: Dual step-down regulator with wide VIN range and high PSRR for noise-sensitive analog front-ends. Use Value: 3.6V–25V input accommodates varying adapter tolerances; ±1% reference ensures compliance with DSL PHY voltage specs. |
Use Scenario: Replacing linear regulators in legacy wall-wart-powered devices (e.g., set-top boxes) to improve efficiency and reduce heat. IC Role / Device Role / Timing Role: Compact dual-buck solution converting unregulated 9V–24V transformer output to stable system rails. Use Value: 1.1MHz switching allows tiny inductors (<3mm height); DFN package fits into space-constrained adapter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EFE#PBF | Single-channel 3A buck; 3MHz switching; no integrated BOOST circuit - requires external gate driver for external FETs. | Not dual-output; suited for higher-current single-rail apps where size is critical but channel count is secondary. | Select when needing >1.6A per rail or ultra-small inductors; avoid when dual independent rails or PGOOD sequencing are required. |
| TPS54290PWPR | Dual 2A synchronous buck; 300kHz–2MHz adjustable freq; integrated MOSFETs; 4.5V–20V input; no BOOST pins. | Uses synchronous rectification (no external diodes); lacks anti-phase operation and separate BOOST architecture. | Prefer for higher efficiency at medium loads and simpler BOM; choose LT3506AEDHD#PBF when bipolar switch robustness, wide VIN, or BOOST-based drive is needed. |
Compared with LTC3631EFE#PBF and TPS54290PWPR, the LT3506AEDHD#PBF uniquely combines dual 1.6A outputs, 1.1MHz fixed frequency, anti-phase operation, and bipolar switch architecture - making it optimal for space-constrained, wide-input, sequenced dual-rail systems where external diode tolerance and thermal resilience are prioritized over peak efficiency.
Availability
LT3506AEDHD#PBF is available at Aetrix Electronics and suitable for DSP power supplies, disk drive electronics, and broadband modem designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT3506AEDHD#PBF 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 high-performance power management portfolio with rigorous qualification and long-term support.
The LT3506AEDHD#PBF belongs to Linear's monolithic current-mode buck regulator family, engineered for high-density, wide-input dual-rail power conversion in telecom, storage, and industrial edge systems.
FAQ
What is the maximum output current per channel for LT3506AEDHD#PBF?
The LT3506AEDHD#PBF delivers up to 1.6A per channel continuously under typical conditions (TA = 25°C, proper thermal layout, and appropriate inductor selection). This rating assumes use of recommended inductors like Sumida CR43-4R7 or Coilcraft DO1606T-222, adequate input/output capacitance, and PCB copper area for heat dissipation. Derating applies above 85°C ambient.
Does LT3506AEDHD#PBF require external Schottky diodes?
Yes, the LT3506AEDHD#PBF requires external Schottky diodes (e.g., ON Semiconductor MBR5230LT3) connected from each SW pin to its respective output. Its internal bipolar NPN switches lack body diodes, so external catch diodes are mandatory for inductor freewheeling and proper regulation - unlike synchronous buck controllers.
Can LT3506AEDHD#PBF operate with a single input supply for both channels?
Yes, LT3506AEDHD#PBF supports single-supply operation: VIN1 (Pins 3,4) and VIN2 (Pins 5,6) can be tied together to one input source. However, VIN2 may also be supplied independently - useful when channel 2 draws from a different rail (e.g., backup battery) or requires isolation for noise management.
What is the purpose of the BOOST pins on LT3506AEDHD#PBF?
The BOOST1 and BOOST2 pins on LT3506AEDHD#PBF provide elevated gate drive voltage (>VIN) to fully saturate the internal bipolar NPN power switches. Each BOOST pin must be connected via a diode and capacitor to its respective output (or VIN), generating ~VOUT + 0.4V - ensuring low VCE(SAT) (~210mV) and high efficiency across load range.
How does LT3506AEDHD#PBF handle overcurrent or short-circuit conditions?
The LT3506AEDHD#PBF employs cycle-by-cycle current limiting with a typical switch current limit of 2.6A (min 2.0A), plus frequency foldback that reduces switching frequency to ~170kHz when FB falls near 0V. Combined with thermal shutdown at 125°C junction temperature, this provides robust fault protection without external circuitry.
LT3506AEDHD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 22V
- Current - Output:
- 1.6A
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LT3506AEDHD#PBF FAQ
1.How can I place an order for LT3506AEDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506AEDHD#PBF 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 LT3506AEDHD#PBF reliable?
The price and inventory of LT3506AEDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506AEDHD#PBF is usually 5 days.
3.What payment methods are accepted for LT3506AEDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506AEDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506AEDHD#PBF?
LT3506AEDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506AEDHD#PBF 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 LT3506AEDHD#PBF?
For technical support, including LT3506AEDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506AEDHD#PBF requirements.
6.How does Aetrix verify that LT3506AEDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3506AEDHD#PBF 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 LT3506AEDHD#PBF meets industry standards.
7.What is the process for return or replacement of LT3506AEDHD#PBF?
All LT3506AEDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506AEDHD#PBF, 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 LT3506AEDHD#PBF part is unused and in its original packaging.
Return procedure for LT3506AEDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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