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Analog Devices Inc. LT3506AEDHD#TRPBF
- Part No.:
- LT3506AEDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3506AEDHD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:418
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Product details
Overview
LT3506AEDHD#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic current-mode PWM step-down DC/DC converter with internal 2A bipolar NPN power switches, delivering two independent 1.6A outputs. It operates at a fixed 1.1MHz switching frequency, supports 3.6V–25V input, regulates to 0.8V feedback reference (±1%), and features anti-phase switching to reduce input ripple - used in DSP power supplies, DSL/cable modems, and distributed power systems.
For engineers reviewing the LT3506AEDHD#TRPBF datasheet, LT3506AEDHD#TRPBF pinout, LT3506AEDHD#TRPBF application, or LT3506AEDHD#TRPBF equivalent, key selection considerations include its dual-channel 1.6A capability, 1.1MHz constant-frequency operation, independent RUN/SS and PGOOD pins for sequencing, thermal shutdown, and DFN-16 (5mm × 4mm) thermally enhanced package with exposed GND pad.
Technical Context
The LT3506AEDHD#TRPBF implements current-mode control per channel using shared master oscillator and independent slave oscillators synchronized in anti-phase (180°), enabling reduced input RMS ripple and predictable ceramic-capacitor-compatible output ripple. Each regulator includes dedicated error amplifier (gm = 350 μMhos), VC pin for loop compensation or override, and cycle-by-cycle current limiting with foldback protection below 0.4V FB.
Its bipolar NPN switch architecture requires external BOOST capacitors (diode + capacitor from VOUT/VIN) to ensure full saturation; minimum boost voltage above SW is 1.5V. Power-good comparators activate at 90% of regulation (720mV FB threshold), with open-collector outputs valid only when VIN > 3.4V and corresponding RUN/SS > 0.8V.
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 layout |
| Input Voltage Range | 3.6V to 25V - supports 4-cell Li-ion, 5V/12V rails, wall adapters, and lead-acid sources |
| Output Current (per channel) | 1.6A continuous - sustained with proper thermal design and ≥2.2μH inductor (LT3506A) |
| Feedback Reference | 0.800V ±1% - sets output via resistor divider; enables precise low-voltage regulation (e.g., 1.8V, 3.3V) |
| Current Limit | 2.0A (min) - protects against overload; decreases linearly with duty cycle up to 78% max |
| Thermal Shutdown | 125°C junction - latches off until cool-down; complements frequency foldback under short-circuit |
| Package | 16-lead DFN (5mm × 4mm) with exposed GND pad - θJC = 4.3°C/W; requires PCB soldering for thermal integrity |
Pinout & Package
LT3506AEDHD#TRPBF is housed in a thermally enhanced 16-lead plastic DFN package (5mm × 4mm) with exposed GND pad (Pin 17), which must be soldered to PCB for electrical and thermal performance. Pin pitch is 0.5mm; package conforms to JEDEC MO-220WEED.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (16), FB2 (9) | Feedback input | Regulates output to 0.8V; connects to resistor divider tap - determines VOUT accuracy and loop stability |
| VC1 (15), VC2 (10) | Error amplifier output | Controls peak switch current; used for loop compensation or external override shutdown |
| RUN/SS1 (13), RUN/SS2 (12) | Enable & soft-start control | Pull high (>0.8V) to enable; capacitor to GND sets soft-start ramp time and limits inrush |
| PGOOD1 (14), PGOOD2 (11) | Open-collector power-good indicator | Active-low signal valid when FB reaches 90% regulation; enables supply sequencing with microcontrollers |
| BOOST1 (1), BOOST2 (8) | Bootstrap drive supply | Must be ≥1.5V above respective SW pin; requires external diode + capacitor for NPN gate drive |
| SW1 (2), SW2 (7) | Switch node | Connects to inductor, catch diode, and BOOST cap - carries high di/dt; requires tight layout |
| VIN1 (3,4), VIN2 (5,6) | Input power inputs | VIN1 powers internal bias circuitry and Channel 1 switch; VIN2 powers Channel 2 switch only |
| GND (17) | Ground reference & thermal path | Exposed pad - mandatory solder connection to PCB ground plane for thermal dissipation and noise control |
Key Features
| Feature | Design Value |
|---|---|
| Anti-phase switching | 180° phase shift between channels reduces input ripple current by ~30%, easing bulk capacitor sizing |
| Independent sequencing control | Dedicated RUN/SS and PGOOD per channel allows staggered startup and fault isolation in multi-rail systems |
| Integrated protection | Frequency foldback (170kHz min), thermal shutdown, and cycle-by-cycle current limit prevent damage during overloads |
| High-efficiency bipolar switches | 2A internal NPN transistors with 210mV VCESAT @ 1A enable >90% efficiency at 1.8V/1.6A (VIN=4.5V) |
| Ceramic-capacitor optimized | Constant-frequency current-mode control eliminates ESR dependency - supports low-ESR X5R/X7R ceramics for minimal footprint |
Applications
| DSP Power Supply | DSL/Cable Modem |
|---|---|
Use Scenario: Dual-rail power for TI C6000 or ADI SHARC processors requiring tightly sequenced 1.2V core and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Primary dual-output buck controller managing core voltage regulation, sequencing, and fault reporting. Use Value: Independent RUN/SS and PGOOD pins eliminate need for external supervisors; 1.1MHz operation shrinks filter components by 2× vs 575kHz alternatives. |
Use Scenario: Compact power solution for residential broadband gateways with space-constrained PCBs and mixed 1.8V/3.3V logic rails. IC Role / Device Role / Timing Role: Single-package dual regulator replacing discrete solutions for PHY and MAC subsystems. Use Value: Anti-phase switching cuts input ripple, reducing required bulk capacitance and EMI filtering complexity in dense layouts. |
| Distributed Power Regulation | Wall Transformer Regulation |
Use Scenario: Local point-of-load conversion in industrial IoT nodes powered from 12V/24V backplanes with wide input tolerance. IC Role / Device Role / Timing Role: High-input-range buck regulator delivering stable 5V and 3.3V from unregulated sources. Use Value: 3.6V–25V input range accommodates brownout and surge conditions without external pre-regulation. |
Use Scenario: AC/DC adapter secondary-side regulation for consumer electronics needing clean, low-noise 5V/3.3V rails. IC Role / Device Role / Timing Role: Post-regulator improving transient response and PSRR over standard linear regulators. Use Value: 1.1MHz switching enables <10μF ceramic output caps - eliminating electrolytics improves reliability and lifetime. |
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 |
|---|---|---|---|
| LT3506EDHD#TRPBF | 575kHz switching frequency; 89% max duty cycle; lower efficiency at high VIN/VOUT ratios | Better suited for higher-current, lower-frequency designs where EMI is less constrained | Select when board layout prioritizes thermal margin over size, or when 575kHz avoids critical noise bands |
| MP2491DS-LF-Z | Single-channel 2A buck; no integrated PGOOD or anti-phase sync; 2.2MHz operation | Requires two ICs for dual-rail; lacks independent sequencing and input ripple reduction | Choose only if single-rail simplicity and ultra-small inductors outweigh need for integrated dual control |
Compared with LT3506EDHD#TRPBF, the LT3506AEDHD#TRPBF delivers smaller magnetics and tighter output ripple at 1.1MHz but trades off slightly lower max duty cycle (78% vs 89%). Against MP2491DS-LF-Z, it provides true dual-channel integration with sequencing and anti-phase benefits - eliminating inter-channel timing mismatches and reducing component count by 30%.
Availability
LT3506AEDHD#TRPBF is available at Aetrix Electronics and suitable for DSP power supplies, DSL/cable modems, and distributed power regulation requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LT3506AEDHD#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 current-mode buck regulator family, designed specifically for space-constrained, multi-rail embedded systems requiring reliable dual-output regulation without external MOSFETs or complex compensation.
FAQ
What is the maximum duty cycle supported by the LT3506AEDHD#TRPBF?
The LT3506AEDHD#TRPBF has a maximum duty cycle of 78%, as specified in its Electrical Characteristics table. This limit arises from internal timing constraints of the 1.1MHz oscillator and affects minimum input voltage calculations - for example, achieving 3.3V output requires VIN > ~4.25V. Exceeding this duty cycle risks regulation loss or foldback activation, especially under heavy load or high temperature.
Can the LT3506AEDHD#TRPBF operate with ceramic output capacitors only?
Yes, the LT3506AEDHD#TRPBF is fully compatible with ceramic output capacitors due to its constant-frequency current-mode architecture, which does not rely on capacitor ESR for loop stability. For 3.3V/1.6A operation, a 22μF X5R/X7R ceramic capacitor delivers <10mVpp ripple; for 1.1MHz designs, 10μF is sufficient per channel. Avoid Y5V/Z5U types due to severe capacitance loss under bias.
How is thermal performance affected by the exposed pad on the LT3506AEDHD#TRPBF DFN package?
The exposed pad (Pin 17) of the LT3506AEDHD#TRPBF is electrically GND and serves as the primary thermal path. With θJC = 4.3°C/W, proper soldering to a ≥250mm² copper pour reduces junction-to-board thermal resistance significantly. Without pad connection, θJA rises from 43°C/W to >70°C/W, risking thermal shutdown at >1A/channel. Thermal vias under the pad are strongly recommended.
Does the LT3506AEDHD#TRPBF support independent enable/disable of each channel?
Yes, the LT3506AEDHD#TRPBF provides fully independent enable control via RUN/SS1 (Pin 13) and RUN/SS2 (Pin 12). Pulling either pin below 0.3V disables its respective channel and associated bias circuits, reducing quiescent current to 30μA total. Soft-start is also per-channel: connecting a capacitor from RUN/SS to GND ramps the enable threshold and limits inrush current.
What BOOST capacitor value is recommended for the LT3506AEDHD#TRPBF?
A 100nF ceramic capacitor (X7R, 16V rating) is recommended between each BOOST pin (1, 8) and its respective SW pin (2, 7), with a Schottky diode (e.g., BAT54A) from VOUT or VIN to BOOST. This ensures sufficient charge for NPN switch saturation at 1.1MHz. Larger values (>220nF) offer margin under high-duty-cycle conditions but increase start-up delay and board area.
LT3506AEDHD#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LT3506AEDHD#TRPBF FAQ
1.How can I place an order for LT3506AEDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506AEDHD#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 LT3506AEDHD#TRPBF reliable?
The price and inventory of LT3506AEDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506AEDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3506AEDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506AEDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506AEDHD#TRPBF?
LT3506AEDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506AEDHD#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 LT3506AEDHD#TRPBF?
For technical support, including LT3506AEDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506AEDHD#TRPBF requirements.
6.How does Aetrix verify that LT3506AEDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3506AEDHD#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 LT3506AEDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3506AEDHD#TRPBF?
All LT3506AEDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506AEDHD#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 LT3506AEDHD#TRPBF part is unused and in its original packaging.
Return procedure for LT3506AEDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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