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Analog Devices Inc. LT3506AIDHD#TRPBF
- Part No.:
- LT3506AIDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3506AIDHD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
LT3506AIDHD#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic current-mode PWM step-down DC/DC converter with two integrated 2A bipolar NPN power switches, delivering up to 1.6A per channel at 1.1MHz switching frequency, 0.8V ±1% feedback reference, and anti-phase operation to minimize input ripple - used in DSP power supplies, DSL/cable modems, and distributed power regulation.
For engineers reviewing the LT3506AIDHD#TRPBF datasheet, LT3506AIDHD#TRPBF pinout, LT3506AIDHD#TRPBF application, or LT3506AIDHD#TRPBF equivalent, this page delivers verified technical context, exact package mapping (16-lead 5mm × 4mm DFN with exposed GND pad), confirmed pin functions, real-world load capability (1.6A per channel), thermal specs (–40°C to 125°C), and validated alternative options for dual-output buck regulator selection.
Technical Context
The LT3506AIDHD#TRPBF implements constant-frequency current-mode control with independent error amplifiers (VC1/VC2), master-slave oscillator synchronization, and anti-phase switching across two channels - enabling fast transient response, cycle-by-cycle current limiting, and reduced input RMS ripple. Each channel features dedicated RUN/SS, PGOOD, FB, and BOOST pins.
It uses internal bipolar NPN switches requiring external boost capacitors and Schottky catch diodes, supports wide 3.6V–25V input, regulates outputs via resistor dividers referenced to 0.8V, and includes frequency foldback (170kHz under fault) and thermal shutdown for robust protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1MHz - enables use of sub-3μH inductors and ≤10μF ceramic output caps for compact dual 1.6A solutions. |
| Max Output Current | 1.6A per channel - sustained under continuous conduction mode with proper inductor selection (e.g., 4.7μH for 3.3V out). |
| Input Voltage Range | 3.6V to 25V - supports 4-cell Li-ion, 5V/12V rails, lead-acid batteries, and unregulated wall adapters. |
| Feedback Reference | 0.8V ±1% - sets output voltage accuracy; allows precise 1.2V, 1.8V, 3.3V, or 5V regulation with standard 1% resistors. |
| Operating Temp Range | –40°C to 125°C - qualified for industrial and extended-temperature embedded systems with full parameter guarantee. |
| Package | 16-lead 5mm × 4mm DFN with exposed thermal pad - requires PCB soldering of Pin 17 (GND) for thermal performance (θJC = 4.3°C/W). |
| Power Good Threshold | 720mV on FB pin - triggers open-collector PGOOD output when output reaches 90% of target, easing sequencing with MCUs/DSPs. |
Pinout & Package
LT3506AIDHD#TRPBF is housed in a thermally enhanced 16-lead plastic DFN (5mm × 4mm) with exposed GND pad (Pin 17), requiring soldering to PCB for thermal management and electrical grounding. Package thermal resistance: θJA = 43°C/W, θJC = 4.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 16), FB2 (Pin 9) | Feedback input | Regulates output by holding voltage at 0.8V; connects to resistor divider tap for programmable VOUT. |
| VC1 (Pin 15), VC2 (Pin 10) | Error amplifier output | Controls peak switch current; used for loop compensation or override shutdown (pull to GND). |
| RUN/SS1 (Pin 13), RUN/SS2 (Pin 12) | Enable & soft-start control | Pull low to disable channel; capacitor to GND limits inrush current during startup. |
| PGOOD1 (Pin 14), PGOOD2 (Pin 11) | Open-collector power-good indicator | Sinks current when FB is <720mV; pulled high externally to signal regulation status for sequencing. |
| BOOST1 (Pin 1), BOOST2 (Pin 8) | Bootstrap drive supply | Provides >VIN gate drive to internal NPN switches via external diode+capacitor; must exceed SW by ≥1.5V. |
| SW1 (Pin 2), SW2 (Pin 7) | Switch node | Connects to inductor, catch diode anode, and boost capacitor cathode; carries high di/dt switching current. |
| VIN1 (Pins 3,4), VIN2 (Pins 5,6) | Input power supply | VIN1 powers internal bias circuitry and Channel 1 switch; VIN2 powers Channel 2 switch - both require local ceramic bypassing. |
| GND (Pin 17, Exposed Pad) | Ground reference & thermal path | Must be soldered to large PCB copper area; serves as primary thermal dissipation path and system ground return. |
Key Features
| Feature | Design Value |
|---|---|
| Anti-phase switching | 180° phase shift between channels reduces input capacitor RMS current and eases EMI filtering. |
| Independent shutdown & soft-start | Per-channel RUN/SS pins allow staggered power-up, sequencing control, and selective disable without affecting other rail. |
| Accurate 0.8V reference | ±1% tolerance over –40°C to 125°C ensures stable output voltage across temperature and line/load variations. |
| Integrated 2A bipolar NPN switches | Eliminates need for external MOSFETs or drivers; optimized for efficiency with external Schottky diodes (e.g., MBR5230LT3). |
| Frequency foldback protection | Reduces switching frequency to 170kHz during overload or short-circuit, limiting peak switch current and thermal stress. |
Applications
| DSP Power Supplies | DSL/Cable Modems |
|---|---|
Use Scenario: Dual-rail power for TI C6000 or Analog Devices SHARC processors requiring 1.2V core and 3.3V I/O. IC Role / Device Role: Primary dual-output buck regulator providing tightly regulated, sequenced voltages with PGOOD signaling. Use Value: Enables reliable boot and runtime operation with <1.6A per rail, 1.1MHz switching minimizing filter size, and thermal robustness to 125°C ambient. |
Use Scenario: Compact power solution for multi-chipset broadband gateways with separate PHY and MAC supply domains. IC Role / Device Role: Dual-channel DC/DC converter powering ADSL line driver (3.3V) and Ethernet PHY (1.8V) from 12V input. Use Value: Reduces BOM count vs discrete regulators; anti-phase operation lowers input cap stress; wide VIN accommodates varying adapter outputs. |
| Distributed Power Regulation | Wall Transformer Regulation |
Use Scenario: Local point-of-load conversion in industrial PLC backplanes where 24V bus feeds multiple 5V/3.3V subsystems. IC Role / Device Role: High-efficiency dual buck regulator converting 24V to 5V and 3.3V with independent enable and monitoring. Use Value: Delivers 1.6A per rail with <85% efficiency at 24V→5V, operates reliably across –40°C to 125°C, and simplifies thermal layout via DFN package. |
Use Scenario: Regulating noisy, unregulated 9–15V AC/DC wall adapters into clean 3.3V and 1.8V for consumer electronics logic boards. IC Role / Device Role: Input-tolerant dual buck IC absorbing line transients and delivering low-noise, well-regulated outputs. Use Value: 3.6V–25V input range accepts wide adapter variance; 1.1MHz operation minimizes output ripple (<15mV p-p typical); PGOOD ensures safe MCU reset timing. |
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 |
|---|---|---|---|
| LTC3631EUF#PBF | Single-channel 3A buck; no dual output or anti-phase; 3MHz switching; requires external compensation. | Not suitable for simultaneous dual-rail generation; better for high-density single-rail apps needing smaller inductors. | Select only if single-output 3A capability suffices and board space favors 3MHz operation over dual-channel coordination. |
| TPS54290PWPR | Dual 2A synchronous buck; 300kHz–2MHz adjustable freq; integrated FETs; no exposed thermal pad; 40V max VIN. | Higher VIN support but lower thermal performance (no exposed pad); synchronous design eliminates catch diodes but increases complexity. | Prefer when input exceeds 25V or synchronous efficiency is critical; avoid if anti-phase ripple reduction or 125°C operation is required. |
Compared with LTC3631EUF#PBF and TPS54290PWPR, the LT3506AIDHD#TRPBF uniquely delivers guaranteed dual 1.6A outputs with anti-phase operation, 125°C qualification, and integrated bipolar switches - making it optimal for thermally constrained, dual-rail industrial and telecom applications where input ripple suppression and extended temperature reliability are essential.
Availability
LT3506AIDHD#TRPBF is available at Aetrix Electronics and suitable for DSP power supplies, DSL/cable modem designs, and distributed power regulation requiring stable component supply, long-term industrial lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LT3506AIDHD#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT3506A belongs to Linear's monolithic dual buck regulator product line, designed specifically for space-constrained, multi-rail embedded systems demanding high efficiency, thermal resilience, and seamless power sequencing.
FAQ
What is the maximum junction temperature and thermal resistance of the LT3506AIDHD#TRPBF?
The LT3506AIDHD#TRPBF has a maximum junction temperature of 125°C and thermal resistance values of θJA = 43°C/W and θJC = 4.3°C/W. Its exposed pad (Pin 17) must be soldered to a PCB thermal plane to achieve these ratings. The device is fully specified and tested over –40°C to 125°C ambient, with guaranteed performance including 0.8V ±1% reference and 1.1MHz switching stability across that range.
Does the LT3506AIDHD#TRPBF support synchronous rectification?
No, the LT3506AIDHD#TRPBF does not support synchronous rectification. It uses internal bipolar NPN power switches and requires external Schottky catch diodes (e.g., MBR5230LT3) connected from SW pins to output. This architecture differs from synchronous buck controllers or converters with integrated MOSFETs, and necessitates careful diode selection for efficiency and thermal performance.
Can the LT3506AIDHD#TRPBF operate with only one channel enabled?
Yes, the LT3506AIDHD#TRPBF supports independent channel operation. Pulling RUN/SS1 low disables Channel 1 while Channel 2 remains active if RUN/SS2 is high, and vice versa. Both channels share the same oscillator and reference, but have separate FB, VC, PGOOD, and BOOST paths - enabling flexible single- or dual-rail configurations without performance degradation.
What is the minimum recommended input capacitance for the LT3506AIDHD#TRPBF?
The minimum recommended input capacitance for the LT3506AIDHD#TRPBF is 4.7μF ceramic (X5R or X7R dielectric), placed close to VIN and GND pins. For optimal EMI suppression and RMS current handling, a 10μF–22μF ceramic capacitor is preferred. The LT3506A's 1.1MHz switching allows smaller values than lower-frequency alternatives, but low-ESR construction remains critical to limit input ripple and ensure stable operation.
How does the LT3506AIDHD#TRPBF handle overcurrent or short-circuit conditions?
The LT3506AIDHD#TRPBF employs cycle-by-cycle current limiting with a typical switch current limit of 2.0A (min 1.7A at high duty cycle), plus frequency foldback that reduces switching frequency to 170kHz during overload. Combined with thermal shutdown at 125°C junction temperature, this provides layered protection. The device does not latch off - it resumes normal operation once fault conditions clear and junction temperature falls below thermal shutdown hysteresis.
LT3506AIDHD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LT3506AIDHD#TRPBF FAQ
1.How can I place an order for LT3506AIDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506AIDHD#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 LT3506AIDHD#TRPBF reliable?
The price and inventory of LT3506AIDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506AIDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3506AIDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506AIDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506AIDHD#TRPBF?
LT3506AIDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506AIDHD#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 LT3506AIDHD#TRPBF?
For technical support, including LT3506AIDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506AIDHD#TRPBF requirements.
6.How does Aetrix verify that LT3506AIDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3506AIDHD#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 LT3506AIDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3506AIDHD#TRPBF?
All LT3506AIDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506AIDHD#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 LT3506AIDHD#TRPBF part is unused and in its original packaging.
Return procedure for LT3506AIDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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