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Analog Devices Inc. LT3506EDHD#TRPBF
- Part No.:
- LT3506EDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3506EDHD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,956
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Product details
Overview
LT3506EDHD#TRPBF 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, 575kHz fixed switching frequency, 3.6V–25V input range, and independent 1.6A output channels. It delivers regulated 1.8V and 3.3V rails for DSP power supplies and distributed power systems.
For engineers reviewing the LT3506EDHD#TRPBF datasheet, LT3506EDHD#TRPBF pinout, LT3506EDHD#TRPBF application, or LT3506EDHD#TRPBF equivalent, key selection criteria include anti-phase switching for reduced input ripple, ±1% 0.8V reference accuracy, independent RUN/SS and PGOOD pins for sequencing, and thermal shutdown with frequency foldback under overload.
Technical Context
The LT3506EDHD#TRPBF 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. Each channel features cycle-by-cycle current limiting, slope-compensated PWM, and VC-pin-based error amplifier output for loop compensation.
Anti-phase operation (180° phase shift) between SW1 and SW2 minimizes input capacitor RMS current and reduces EMI. The internal 800mV reference is trimmed to ±1% over –40°C to 85°C, and feedback regulation occurs at FB = 0.8V with 720mV power-good threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 575kHz - enables use of small ceramic capacitors and ≤6.4μH inductors for compact layout |
| Input Voltage Range | 3.6V to 25V - supports 4-cell Li-ion, 5V logic rails, wall adapters, and lead-acid batteries |
| Output Current per Channel | 1.6A continuous - sustained delivery with thermal derating above 85°C ambient |
| Feedback Reference Voltage | 0.8V ±1% - ensures tight output regulation across temperature and load |
| Power Good Threshold | 720mV on FB pin - provides reliable sequencing signal when output reaches 90% of target |
| Switch Current Limit | 2.0A minimum - protects against short-circuit and overload with cycle-by-cycle limiting |
| Quiescent Current | 3.8mA (active), 30μA (shutdown) - balances light-load efficiency and low standby power |
Pinout & Package
LT3506EDHD#TRPBF 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 (Pin 16), FB2 (Pin 9) | Feedback input | Regulates output to 0.8V; connects to resistor divider tap for programmable VOUT |
| RUN/SS1 (Pin 13), RUN/SS2 (Pin 12) | Enable & soft-start control | Pull low to disable; external capacitor sets startup ramp rate and limits inrush |
| PGOOD1 (Pin 14), PGOOD2 (Pin 11) | Open-collector status indicator | Sinks current when output is within 10% of regulation-enables supply sequencing |
| VC1 (Pin 15), VC2 (Pin 10) | Error amplifier output | Controls peak switch current; used for loop compensation or override shutdown |
| BOOST1 (Pin 1), BOOST2 (Pin 8) | Bootstrap drive supply | Requires external diode + capacitor to generate >VIN voltage for NPN switch saturation |
| SW1 (Pin 2), SW2 (Pin 7) | Switch node | Connects to inductor, catch diode, and boost capacitor; carries high di/dt switching current |
| VIN1 (Pins 3,4), VIN2 (Pins 5,6) | Input power supply | VIN1 powers internal bias regulator and SW1 path; VIN2 powers SW2 path-may be tied together or isolated |
| Exposed Pad (Pin 17) | Ground & thermal interface | Must be soldered to PCB ground plane; primary thermal conduction path to board |
Key Features
| Feature | Design Value |
|---|---|
| Anti-phase switching | Reduces input ripple current by ~70% vs. in-phase dual buck, allowing smaller input capacitors |
| Independent shutdown & soft-start | Enables staggered power-up of dual rails without external timing circuitry |
| Accurate 0.8V reference (±1%) | Supports <±1.5% total output tolerance with 1% resistors, critical for DSP core voltage stability |
| Frequency foldback under fault | Reduces switching frequency to 170kHz during overload or short-circuit, limiting power dissipation |
| Thermal shutdown protection | Activates at TJ = 125°C and holds until junction cools by ≥15°C-prevents permanent damage |
Applications
| DSP Power Supply | Disk Drive Power Management |
|---|---|
Use Scenario: Dual-rail power for TI C6000 or ADI SHARC processors requiring 1.2V core and 3.3V I/O. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated, sequenced outputs with PGOOD signaling. Use Value: Independent RUN/SS and PGOOD pins eliminate need for external supervisors, reducing BOM count and board area. |
Use Scenario: Powering spindle motor driver and servo controller in 2.5″ HDDs with wide input variation (7–19V). IC Role / Device Role / Timing Role: Dual-channel buck converter supplying 5V actuator and 3.3V logic rails from unregulated battery or adapter input. Use Value: 3.6V–25V input range accommodates aging battery discharge curves without brownout; anti-phase operation lowers EMI near sensitive read/write heads. |
| Wall Transformer Regulation | Distributed Power Regulation |
Use Scenario: Regulating noisy, unregulated 12V/24V wall adapters into clean 3.3V and 5V system rails. IC Role / Device Role / Timing Role: High-efficiency DC/DC front-end with built-in input filtering via anti-phase ripple cancellation. Use Value: Eliminates need for large bulk input capacitors-reduces solution size by >30% vs. single-channel alternatives. |
Use Scenario: Local point-of-load conversion in telecom line cards with 48V backplane and mixed 1.8V/3.3V ASIC requirements. IC Role / Device Role / Timing Role: Dual-output POL regulator with thermal monitoring and fault reporting via PGOOD. Use Value: Integrated current limit and frequency foldback enable robust operation under dynamic load transients common in packet-switched systems. |
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 |
|---|---|---|---|
| LT3506AEDHD#TRPBF | 1.1MHz switching frequency vs. 575kHz; 78% max duty cycle vs. 89%; higher quiescent current (4.8mA) | Better suited for ultra-compact designs using ≤2.2μH inductors; reduced low-frequency noise but higher switching losses | Select LT3506AEDHD#TRPBF when board space is constrained and input voltage allows ≥7V for 3.3V output. |
| TPS54290PWPR | 2.2MHz FET-based synchronous buck; no internal diode; requires external MOSFETs; 4.5–28V input | Higher efficiency (>92% at 1A) and lower thermal footprint, but needs 4 external FETs and more compensation components | Choose TPS54290PWPR for high-volume, thermally sensitive applications where design resources allow added complexity. |
Compared with LT3506AEDHD#TRPBF and TPS54290PWPR, the LT3506EDHD#TRPBF offers optimal balance of integration, thermal robustness, and ease of use for industrial and embedded systems requiring dual 1.6A rails without synchronous rectification overhead.
Availability
LT3506EDHD#TRPBF is available at Aetrix Electronics and suitable for DSP power supplies, disk drive controllers, wall transformer regulation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for LT3506EDHD#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 all Linear-branded power ICs.
The LT3506 series was designed specifically for high-density dual-output DC/DC conversion in space-constrained industrial, telecom, and computing applications where anti-phase ripple reduction and independent sequencing are critical.
FAQ
What is the maximum output current per channel for LT3506EDHD#TRPBF?
The LT3506EDHD#TRPBF delivers up to 1.6A per channel continuously under typical conditions (TA ≤ 85°C, adequate PCB copper, 575kHz fSW). This assumes proper inductor selection (e.g., 6.4μH for 3.3V output), input voltage ≥4.85V, and thermal management via the exposed pad. Peak switch current limit is 2.0A minimum, decreasing linearly with duty cycle above 50%.
Does LT3506EDHD#TRPBF require external Schottky diodes?
Yes, the LT3506EDHD#TRPBF requires external Schottky catch diodes (e.g., MBR5230LT3) connected from SWx to VOUTx. Unlike synchronous buck regulators, it uses internal bipolar NPN switches and relies on external diodes for freewheeling current path. Diode forward voltage directly impacts efficiency and thermal performance.
How does anti-phase switching reduce input ripple in LT3506EDHD#TRPBF?
The LT3506EDHD#TRPBF drives SW1 and SW2 with 180° phase offset, causing input current pulses from each channel to partially cancel at the VIN node. This reduces RMS input capacitor current by up to 70% compared to in-phase operation, enabling smaller ceramic input capacitors (e.g., 4.7μF X7R) and lower EMI emissions.
Can LT3506EDHD#TRPBF operate with only one channel enabled?
Yes, the LT3506EDHD#TRPBF supports single-channel operation. Pulling RUN/SS2 low disables Channel 2 while Channel 1 remains fully functional with independent PGOOD1, FB1, and VC1 control. The device draws only 3.8mA from VIN1 in this mode, and thermal performance improves due to reduced power dissipation.
What is the purpose of the BOOST pins on LT3506EDHD#TRPBF?
The BOOST1 and BOOST2 pins on LT3506EDHD#TRPBF provide gate drive voltage >VIN to fully saturate the internal bipolar NPN power switches. Each requires an external diode (anode to VOUTx) and capacitor (cathode to BOOSTx, anode to SWx) to generate a bootstrap voltage ~VOUTx above SWx, ensuring low VCE(SAT) (<210mV) and high efficiency.
LT3506EDHD#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):
- 23.25V
- Current - Output:
- 1.6A
- Frequency - Switching:
- 575kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LT3506EDHD#TRPBF FAQ
1.How can I place an order for LT3506EDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506EDHD#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 LT3506EDHD#TRPBF reliable?
The price and inventory of LT3506EDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506EDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3506EDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506EDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506EDHD#TRPBF?
LT3506EDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506EDHD#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 LT3506EDHD#TRPBF?
For technical support, including LT3506EDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506EDHD#TRPBF requirements.
6.How does Aetrix verify that LT3506EDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3506EDHD#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 LT3506EDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3506EDHD#TRPBF?
All LT3506EDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506EDHD#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 LT3506EDHD#TRPBF part is unused and in its original packaging.
Return procedure for LT3506EDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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