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Analog Devices Inc. LT3506IFE#TRPBF
- Part No.:
- LT3506IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3506IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,150
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Product details
Overview
LT3506IFE#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 3.6V–25V input and fixed 0.8V feedback reference (±1%). It operates at 575kHz switching frequency with anti-phase operation to reduce input ripple, and features independent shutdown, soft-start, and power-good signals for reliable power sequencing in multi-rail systems.
For engineers reviewing the LT3506IFE#TRPBF datasheet, LT3506IFE#TRPBF pinout, LT3506IFE#TRPBF application, or LT3506IFE#TRPBF equivalent, key selection considerations include its I-grade (–40°C to 125°C) thermal rating, TSSOP-16 package with exposed pad, dual-channel phase-interleaved architecture, 0.8V ±1% reference accuracy, and built-in frequency foldback for overload protection.
Technical Context
The LT3506IFE#TRPBF implements a constant-frequency current-mode control architecture with shared master oscillator and independent slave oscillators per channel, enabling precise duty-cycle regulation and fast transient response. Each channel uses an internal error amplifier (gm = 350 μMhos, gain = 400 V/V) to drive the VC pin, which directly controls peak switch current via slope-compensated current sensing.
Anti-phase switching (180° phase shift) between channels reduces input capacitor RMS current and minimizes EMI; frequency foldback activates below 0.4V on FB pins during overloads, lowering switching frequency to 170kHz to limit power dissipation. Thermal shutdown and cycle-by-cycle current limiting (2.0A min, 3.6A max) provide robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports 4-cell Li-ion, 5V logic rails, wall adapters, and lead-acid batteries without external pre-regulation. |
| Switching Frequency | 575kHz - enables use of compact 2.2–6.8μH inductors and ceramic output capacitors for space-constrained designs. |
| Output Current per Channel | 1.6A continuous - sustained delivery under full load with thermal derating in TSSOP-16 package at 125°C junction. |
| Feedback Reference Voltage | 0.800V ±1% (–40°C to 125°C) - ensures tight output regulation across industrial temperature range with minimal resistor-divider error. |
| Power-Good Threshold | 720mV rising on FB - provides accurate sequencing signal when output reaches 90% of target voltage, compatible with MCU/DSP enable inputs. |
| Quiescent Current | 3.8mA (active), 30μA (shutdown) - enables low-power standby modes while maintaining fast wake-up capability. |
| Operating Temperature | –40°C to +125°C (I-grade) - validated and tested across full range for industrial and automotive under-hood applications. |
Pinout & Package
LT3506IFE#TRPBF is housed in a 16-lead plastic TSSOP narrow package (FE) with exposed thermal pad (Pin 17) that must be soldered to PCB ground for thermal and electrical integrity. θJA = 45°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 / FB2 (Pins 16, 9) | Feedback input for Channel 1 / Channel 2 | Regulated to 0.8V ±1%; sets output voltage via external resistor divider; triggers PGOOD when ≥720mV. |
| VC1 / VC2 (Pins 15, 10) | Error amplifier output for Channel 1 / Channel 2 | Controls peak switch current; clamped at 0.75V threshold and 1.9V max; used for loop compensation or override. |
| PGOOD1 / PGOOD2 (Pins 14, 11) | Open-collector power-good indicator | Active-low signal valid only when VIN > 3.4V and respective RUN/SS pin is high; enables supply sequencing. |
| RUN/SS1 / RUN/SS2 (Pins 13, 12) | Enable and soft-start control | Pull low to disable channel; capacitor to ground sets soft-start ramp time; internal 2μA current source charges CSS. |
| BOOST1 / BOOST2 (Pins 1, 8) | Bootstrap drive voltage supply | Must be ≥1.5V above SW pin; driven by external diode+capacitor to fully saturate internal NPN switches. |
| SW1 / SW2 (Pins 2, 7) | Switch node output | Connects to inductor, catch diode, and boost capacitor; internal 2A NPN switch with 210mV VCE(SAT) @ 1A. |
| VIN1 / VIN2 (Pins 3,4 / 5,6) | Input power supply pins | VIN1 powers internal bias regulator and Channel 1 switch; VIN2 powers Channel 2 switch only; both require local 4.7μF+ ceramic bypass. |
| GND (Pin 17 Exposed Pad) | Ground reference and thermal path | Exposed pad is electrically GND and mandatory for thermal performance; must be soldered to large PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Dual anti-phase switching | Reduces input ripple current by ~30% vs. in-phase operation, allowing smaller input capacitors and lower EMI filtering cost. |
| Independent soft-start and shutdown | Enables staggered power-up sequencing across rails without external timers or logic; each channel controlled separately via RUN/SS pins. |
| Accurate 0.8V reference (±1%) | Minimizes output voltage error across –40°C to 125°C, eliminating need for post-regulation trimming in precision analog or DSP supplies. |
| Frequency foldback protection | Automatically lowers switching frequency to 170kHz during overload or short-circuit, reducing thermal stress and improving fault recovery. |
| Thermally enhanced TSSOP | 16-lead narrow TSSOP with exposed pad achieves 10°C/W junction-to-case thermal resistance-enabling 1.6A/channel at 125°C ambient with proper layout. |
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 with strict sequencing. IC Role / Device Role: Primary dual-output buck regulator providing regulated, sequenced voltages with independent PGOOD signaling. Use Value: Eliminates need for discrete sequencing ICs; 575kHz operation allows <5mm² total solution size per rail using 2.2μH inductors and 22μF X7R ceramics. |
Use Scenario: Compact AC/DC adapter-derived 12V-to-3.3V/1.8V conversion in residential broadband gateways with space constraints. IC Role / Device Role: High-efficiency dual buck converter powering PHY, MAC, and memory subsystems from single unregulated input. Use Value: Anti-phase operation cuts input ripple by half, relaxing bulk capacitor requirements and reducing conducted EMI filter size by 40%. |
| Industrial Disk Drive Controllers | Distributed Power Regulation |
Use Scenario: Powering spindle motor driver ICs and servo controllers in ruggedized storage enclosures operating from 24V DC bus. IC Role / Device Role: Robust dual buck stage delivering 1.8V logic and 5V analog rails with thermal shutdown and current limiting. Use Value: I-grade rating (–40°C to 125°C) and 25V absolute max input ensure reliability in hot, vibration-prone environments without derating. |
Use Scenario: Local point-of-load regulation in programmable logic controller (PLC) backplanes where 24V field bus powers multiple isolated modules. IC Role / Device Role: Compact dual POL converter generating 3.3V and 5V from shared 24V rail with independent enable and fault reporting. Use Value: Independent RUN/SS and PGOOD pins allow module-level power management and hot-swap compatibility without system-level coordination. |
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 PGOOD or soft-start; requires external compensation. | Lacks dual output and sequencing features; suited for higher-current single-rail apps where size is critical. | Select LTC3631EFE#PBF only if single-rail 3A output suffices and board space is premium; not a functional substitute for LT3506IFE#TRPBF's dual-channel architecture. |
| TPS54290PWPR | Dual 2A synchronous buck; 300kHz–2MHz adjustable freq; integrated MOSFETs; no anti-phase sync; different pinout. | Higher efficiency at light loads due to synchronous rectification; lacks guaranteed anti-phase operation and I-grade temp support. | Choose TPS54290PWPR for efficiency-sensitive, non-industrial apps; avoid where guaranteed 125°C operation or input ripple reduction is required. |
Compared with LTC3631EFE#PBF and TPS54290PWPR, LT3506IFE#TRPBF uniquely delivers verified anti-phase dual 1.6A regulation with I-grade thermal validation, integrated PGOOD/soft-start per channel, and fixed 575kHz operation optimized for small magnetics-making it irreplaceable in space- and sequencing-constrained industrial power designs.
Availability
LT3506IFE#TRPBF is available at Aetrix Electronics and suitable for industrial disk drive controllers, DSL/cable modem power supplies, distributed PLC power systems, and ruggedized DSP power applications requiring stable component supply across extended temperature ranges.
Supply support for LT3506IFE#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 technical and manufacturing continuity for legacy Linear power products.
The LT3506IFE#TRPBF belongs to Linear's high-reliability industrial DC/DC converter family, designed specifically for dual-rail, thermally demanding applications where sequencing, input ripple suppression, and wide-input operation are critical.
FAQ
What is the maximum junction temperature and thermal resistance of the LT3506IFE#TRPBF?
The LT3506IFE#TRPBF has a maximum junction temperature of 125°C and is rated for operation from –40°C to +125°C (I-grade). Its TSSOP-16 package exhibits θJA = 45°C/W and θJC = 10°C/W. Proper thermal design requires soldering the exposed pad (Pin 17) to a minimum 200 mm² copper area on the PCB to maintain safe junction temperatures at full 1.6A/channel load.
Does the LT3506IFE#TRPBF support anti-phase operation, and how is it implemented?
Yes, the LT3506IFE#TRPBF implements guaranteed 180° anti-phase switching between its two channels using a shared master oscillator and synchronized slave oscillators. This architecture reduces input ripple current magnitude and RMS value, allowing smaller input capacitors and lower EMI filter complexity. Phase relationship is ensured by design and does not require external configuration.
What are the key differences between the LT3506IFE#TRPBF and the LT3506AIFE#TRPBF?
The LT3506IFE#TRPBF operates at 575kHz with 89% maximum duty cycle, while the LT3506AIFE#TRPBF runs at 1.1MHz with 78% maximum duty cycle. The LT3506A variant enables smaller inductors (e.g., 1.5μH vs. 6.4μH) but reduces maximum input voltage headroom at low output voltages due to higher minimum duty cycle. Both share identical pinout, thermal rating, and feature set.
Can the LT3506IFE#TRPBF be used with ceramic output capacitors, and what is the recommended value?
Yes, the LT3506IFE#TRPBF is fully compatible with low-ESR ceramic output capacitors due to its current-mode control architecture. For 3.3V/1.6A outputs, a 22μF X5R or X7R 6.3V ceramic capacitor is recommended; for 1.8V outputs, 22μF remains appropriate, and increasing capacitance improves transient response. Y5V/Z5U types are discouraged due to voltage/temperature coefficient-induced capacitance loss.
How does the LT3506IFE#TRPBF handle overload or short-circuit conditions?
The LT3506IFE#TRPBF employs three-tiered protection: cycle-by-cycle current limiting (2.0A min switch current limit), frequency foldback (reducing fSW to 170kHz when FB < 0.4V), and thermal shutdown (triggered at TJ = 125°C). During sustained overload, foldback lowers switching frequency to reduce power dissipation, enabling safe hiccup-mode recovery without latch-off.
LT3506IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3506IFE#TRPBF FAQ
1.How can I place an order for LT3506IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506IFE#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 LT3506IFE#TRPBF reliable?
The price and inventory of LT3506IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3506IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506IFE#TRPBF?
LT3506IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506IFE#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 LT3506IFE#TRPBF?
For technical support, including LT3506IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506IFE#TRPBF requirements.
6.How does Aetrix verify that LT3506IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3506IFE#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 LT3506IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3506IFE#TRPBF?
All LT3506IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506IFE#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 LT3506IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3506IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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