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Analog Devices Inc. LT3506EDHD#PBF
- Part No.:
- LT3506EDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3506EDHD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LT3506EDHD#PBF 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, 575kHz fixed switching frequency, 3.6V–25V input range, and independent 1.6A output capability per channel. It delivers regulated 1.8V/3.3V outputs in disk drive and DSP power supplies using anti-phase operation to minimize input ripple.
For engineers reviewing the LT3506EDHD#PBF datasheet, LT3506EDHD#PBF pinout, LT3506EDHD#PBF application, or LT3506EDHD#PBF equivalent, this page provides verified package mapping (16-lead 5mm × 4mm DFN), confirmed dual-buck topology, exact soft-start/shutdown independence per channel, validated 0.8V ±1% feedback reference, and real-world thermal performance data (θJC = 4.3°C/W).
Technical Context
The LT3506EDHD#PBF implements a constant-frequency current-mode control architecture with shared master oscillator and independent slave oscillators per channel, enabling precise anti-phase (180°) switching that reduces input RMS ripple current. Each regulator features cycle-by-cycle current limiting, frequency foldback under overload, and internal 800mV reference with ±1% accuracy over –40°C to 85°C.
Its bipolar NPN switch design requires external BOOST capacitors for gate drive voltage boosting above VIN; VC pins serve as error amplifier outputs controlling peak switch current, while RUN/SS pins provide independent enable/soft-start with 2.1μA charging current and 0.8V threshold. Power-good comparators assert open-collector outputs when FB reaches 90% of regulation.
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 without external pre-regulation. |
| Switching Frequency | 575kHz - enables use of compact 2.2–6.4μH inductors and ceramic input/output capacitors for minimal board area. |
| Output Current per Channel | 1.6A continuous - sustained at VOUT = 1.8V/3.3V with proper inductor selection (e.g., Sumida CR54-6R4) and thermal layout. |
| Feedback Reference Voltage | 0.8V ±1% - ensures tight output regulation tolerance across temperature; sets output via resistor divider (R1 = R2×(VOUT/0.8−1)). |
| Quiescent Current | 3.8mA (active), 30μA (shutdown) - enables low-power standby modes in battery-powered systems like DSL modems. |
| Thermal Resistance θJC | 4.3°C/W - requires soldering of exposed pad (Pin 17) to PCB ground plane for reliable 1.6A/channel operation at 85°C ambient. |
| Phase Relationship | 180° anti-phase - cuts input capacitor RMS current by up to 30% versus in-phase dual buck, reducing required capacitance and EMI. |
Pinout & Package
LT3506EDHD#PBF uses a thermally enhanced 16-lead plastic DFN package (5mm × 4mm) with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. Package meets JEDEC MO-220 standard with θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (16), FB2 (9) | Feedback Input | Regulates output to 0.8V; connects to resistor divider tap - determines VOUT1/VOUT2 independently. |
| VC1 (15), VC2 (10) | Error Amplifier Output | Controls peak switch current; used for loop compensation or override shutdown (pull to GND). |
| RUN/SS1 (13), RUN/SS2 (12) | Enable & Soft-Start Control | 0.8V threshold enables channel; external capacitor sets soft-start ramp rate and limits inrush current. |
| PGOOD1 (14), PGOOD2 (11) | Power-Good Indicator | Open-collector output asserts high when FB reaches 90% of regulation - enables safe supply sequencing with MCUs/DSPs. |
| BOOST1 (1), BOOST2 (8) | Bootstrap Drive Supply | Must be biased >VIN via diode+capacitor to fully saturate internal NPN switches - critical for efficiency at low VOUT. |
| SW1 (2), SW2 (7) | Switch Node | Connects to inductor, catch diode, and BOOST capacitor - carries high di/dt; requires tight layout to minimize EMI. |
| VIN1 (3,4), VIN2 (5,6) | Input Power Supply | VIN1 powers internal bias circuitry and Channel 1 switch; VIN2 powers Channel 2 switch - may be tied together or isolated. |
| GND (17) | Ground / Thermal Pad | Exposed pad must be soldered to large PCB copper area - primary thermal path and signal return for both channels. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Each channel has dedicated RUN/SS, PGOOD, FB, VC, and BOOST - enables asymmetric outputs (e.g., 1.8V + 3.3V) and staggered startup. |
| Anti-phase switching | 180° phase shift between channels reduces input ripple current magnitude and allows smaller input bulk capacitors. |
| Integrated 2A bipolar NPN switches | Eliminates need for external MOSFETs or drivers; optimized for high-efficiency at 1.6A with VCESAT ≈ 210mV @ 1A. |
| Accurate 0.8V reference (±1%) | Ensures output voltage accuracy within ±1.5% over line/load/temperature - suitable for FPGA core and memory I/O rails. |
| Frequency foldback protection | Reduces switching frequency to ~170kHz during overload or short-circuit - limits peak switch current and thermal stress. |
| Thermal shutdown | Activates at TJ = 125°C - protects device during sustained overload or inadequate heatsinking on compact PCBs. |
Applications
| Disk Drive Power Supply | DSP Core & I/O Supply |
|---|---|
Use Scenario: Dual-rail power for 2.5" HDD servo controller and spindle motor driver. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 1.2V @ 1.6A (core) and 3.3V @ 1.6A (interface) from 12V input. Use Value: Anti-phase operation minimizes input ripple on shared 12V bus, reducing need for oversized bulk capacitors and easing EMI filtering. |
Use Scenario: Powering TI C6000 or Analog Devices SHARC DSP with separate core (1.2V) and I/O (3.3V) rails. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing tightly sequenced, low-noise supplies with independent PGOOD signaling. Use Value: Independent RUN/SS pins allow controlled startup order (core before I/O), preventing latch-up during boot. |
| DSL/Cable Modem Power | Distributed Power Regulation |
Use Scenario: Compact AC/DC adapter replacement powering PHY, MAC, and memory in residential broadband gateway. IC Role / Device Role / Timing Role: Step-down regulator converting 12V or 24V adapter output to 1.8V (PHY) and 5V (USB interface) rails. Use Value: 575kHz switching enables small 2.2μH inductors and 10–22μF ceramic caps - achieves < 1cm² solution size per channel. |
Use Scenario: Local point-of-load regulation in industrial PLC backplane where 24V distributed rail feeds multiple subsystems. IC Role / Device Role / Timing Role: Dual buck converter generating isolated 3.3V (control logic) and 5V (sensor interface) from common 24V source. Use Value: Wide 3.6–25V input range accommodates brownout conditions; thermal pad ensures reliability in convection-cooled enclosures. |
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#PBF | 1.1MHz switching frequency vs. 575kHz; 78% max duty cycle vs. 89%; higher quiescent current (4.8mA). | Better suited for ultra-compact designs needing <2.2μH inductors; less optimal for high-VIN-to-low-VOUT conversion (e.g., 12V→1.2V). | Select LT3506AEDHD#PBF when board space is constrained and input voltage exceeds 5V; retain LT3506EDHD#PBF for wider duty-cycle margin and lower IQ. |
| TPS54290PWPR | Single-channel 2A buck with external FETs; no integrated switches; requires external gate drivers and bootstrap components. | Lacks dual-channel integration and anti-phase benefit; demands more external components and layout effort. | Choose TPS54290PWPR only if higher efficiency at light load or programmable frequency is required - not a drop-in replacement. |
Compared with LT3506AEDHD#PBF, the LT3506EDHD#PBF offers superior duty-cycle headroom for high-ratio conversions and lower quiescent current, while TPS54290PWPR trades integration for flexibility in FET selection and thermal management - neither matches the LT3506EDHD#PBF's combination of dual-channel autonomy, anti-phase ripple reduction, and bipolar switch efficiency.
Availability
LT3506EDHD#PBF is available at Aetrix Electronics and suitable for disk drive power supplies, DSP core/I/O rails, DSL/cable modem designs, and distributed industrial power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3506EDHD#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, communications, and industrial markets.
The LT3506 series belongs to Linear Technology's monolithic switching regulator product line, designed specifically for space-constrained, high-reliability dual-rail applications demanding low EMI, precise sequencing, and wide-input operation without external power switches.
FAQ
What is the maximum output current per channel for LT3506EDHD#PBF?
The LT3506EDHD#PBF delivers up to 1.6A continuous output current per channel under typical conditions (e.g., VOUT = 1.8V or 3.3V, VIN = 5–12V, 2-layer PCB with thermal pad soldered). This assumes proper inductor selection (e.g., Sumida CR54-6R4, 6.4μH), adequate input/output capacitance, and ambient temperature ≤85°C. Peak switch current limit is 2.0A minimum, derating linearly above 80% duty cycle.
Does LT3506EDHD#PBF require external MOSFETs or diodes?
No, the LT3506EDHD#PBF integrates two 2A bipolar NPN power switches - no external MOSFETs are needed. However, external Schottky catch diodes (e.g., ON Semi MBR5230LT3) are required per channel, along with BOOST capacitors and diodes to generate gate drive voltage above VIN. Inductors and input/output capacitors are also external.
How does anti-phase operation reduce input ripple in LT3506EDHD#PBF?
The LT3506EDHD#PBF synchronizes its two channels with 180° phase offset, causing their input current pulses to partially cancel. This reduces RMS input ripple current by up to 30% compared to in-phase operation, allowing smaller input bulk capacitors (e.g., 4.7μF ceramic instead of 22μF) and easing EMI filter design - a key advantage in space-limited applications like cable modems.
What is the role of the exposed pad (Pin 17) on LT3506EDHD#PBF?
The exposed pad (Pin 17) on the LT3506EDHD#PBF serves as both the primary thermal dissipation path (θJC = 4.3°C/W) and the main signal ground connection. It must be soldered to a large PCB copper area tied to system ground - failure to do so risks thermal runaway at full load and degraded regulation accuracy due to ground bounce.
Can LT3506EDHD#PBF operate with a single input supply for both channels?
Yes, LT3506EDHD#PBF supports single-supply operation: VIN1 (Pins 3,4) and VIN2 (Pins 5,6) can be connected to the same source. VIN1 powers the internal bias regulator and Channel 1 switch; VIN2 powers only Channel 2 switch. For best efficiency and noise isolation, tie VIN1/VIN2 together with short, low-inductance traces - do not route through shared ferrite beads.
LT3506EDHD#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):
- 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#PBF FAQ
1.How can I place an order for LT3506EDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506EDHD#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 LT3506EDHD#PBF reliable?
The price and inventory of LT3506EDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506EDHD#PBF is usually 5 days.
3.What payment methods are accepted for LT3506EDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506EDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506EDHD#PBF?
LT3506EDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506EDHD#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 LT3506EDHD#PBF?
For technical support, including LT3506EDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506EDHD#PBF requirements.
6.How does Aetrix verify that LT3506EDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3506EDHD#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 LT3506EDHD#PBF meets industry standards.
7.What is the process for return or replacement of LT3506EDHD#PBF?
All LT3506EDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506EDHD#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 LT3506EDHD#PBF part is unused and in its original packaging.
Return procedure for LT3506EDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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