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Analog Devices Inc. LT3506AIFE#PBF
- Part No.:
- LT3506AIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3506AIFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.6A DL 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,306
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Product details
Overview
LT3506AIFE#PBF 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, operating at 1.1MHz switching frequency, supporting independent 1.6A outputs, 3.6V–25V input range, and anti-phase operation to reduce input ripple - used in DSP power supplies and distributed power regulation.
For engineers reviewing the LT3506AIFE#PBF datasheet, LT3506AIFE#PBF pinout, LT3506AIFE#PBF application, or LT3506AIFE#PBF equivalent, key selection criteria include verified 1.1MHz constant-frequency operation, independent RUN/SS and PGOOD pins per channel, ±1% 0.8V reference accuracy, thermal shutdown/frequency foldback protection, and compatibility with ceramic output capacitors for low-ripple 1.6A dual-rail designs.
Technical Context
The LT3506AIFE#PBF implements dual independent current-mode buck regulators sharing a master oscillator and voltage reference but with separate error amplifiers (VC1/VC2), soft-start (RUN/SS1/RUN/SS2), and power-good (PG1/PG2) circuits. Each channel regulates its FB pin to 0.8V with ±1% tolerance over –40°C to 125°C.
Its 1.1MHz fixed-frequency operation enables use of sub-5μH inductors and ceramic capacitors; anti-phase switching reduces input RMS ripple; internal bipolar switches require external BOOST diode-capacitor networks; slope compensation mandates minimum inductance (e.g., >2.2μH for VOUT=3.3V at VIN<7V) to avoid subharmonic oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1MHz - enables compact 2.2–4.7μH inductors and ≤10μF ceramic output caps |
| Input Voltage Range | 3.6V to 25V - supports 4-cell Li-ion, 5V logic rails, unregulated wall adapters, and lead-acid sources |
| Output Current per Channel | 1.6A continuous - limited by 2.0–3.6A switch current limit and thermal design in TSSOP package |
| Feedback Reference Voltage | 0.8V ±1% - sets output via resistor divider; enables precise 1.2V, 1.8V, 3.3V, or 5V rails |
| Operating Temperature Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded systems |
| Quiescent Current | 4.8mA (typ) - measured at VIN=5V, both channels active, enabling efficient light-load operation |
| Shutdown Current | 45μA (max) - achieved when either RUN/SS pin pulled low; critical for battery-backed systems |
Pinout & Package
LT3506AIFE#PBF is housed in a 16-lead plastic TSSOP narrow package (FE grade) with exposed pad (Pin 17) soldered to PCB for thermal and ground integrity. Package dimensions: 5mm × 4.4mm × 1.1mm, θJA = 45°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 16), FB2 (Pin 9) | Feedback input | Regulated to 0.8V ±1%; sets output voltage via external resistor divider |
| VC1 (Pin 15), VC2 (Pin 10) | Error amplifier output | Controls peak switch current; used for loop compensation or override shutdown |
| PG1 (Pin 14), PG2 (Pin 11) | Power-good open-collector output | Asserts high when FB reaches 90% of regulation; enables supply sequencing with microcontrollers |
| RUN/SS1 (Pin 13), RUN/SS2 (Pin 12) | Enable & soft-start control | Pulled high (>0.8V) to start regulator; capacitor to GND controls inrush current ramp rate |
| BOOST1 (Pin 1), BOOST2 (Pin 8) | Bootstrap drive supply | Requires external diode+cap to generate >VIN voltage for full saturation of internal NPN switches |
| 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 inputs | VIN1 powers internal bias circuitry and SW1 switch; VIN2 powers SW2 switch only - may be tied together or isolated |
| GND (Pin 17, Exposed Pad) | Ground reference & thermal path | Must be soldered to large PCB copper area; serves as primary thermal dissipation path |
Key Features
| Feature | Design Value |
|---|---|
| Dual anti-phase switching | Reduces input ripple current amplitude by ~50% vs. in-phase operation - lowers bulk capacitor stress and EMI filtering requirements |
| Independent shutdown & soft-start | Per-channel RUN/SS pins allow staggered power-up sequencing and individual fault isolation without board-level redesign |
| Accurate 0.8V reference (±1%) | Enables stable 1.2V–5V output rails across temperature; minimizes output tolerance stack-up in multi-rail systems |
| Integrated 2A bipolar power switches | Eliminates need for external MOSFETs or drivers; simplifies layout while maintaining efficiency >85% at 1.6A/3.3V out |
| Frequency foldback & thermal shutdown | Automatically reduces switching frequency under overload or high-temp conditions to limit power dissipation and prevent latch-up |
Applications
| DSP Power Supplies | Wall Transformer Regulation |
|---|---|
Use Scenario: Providing tightly regulated 1.2V core and 3.3V I/O rails to TI C6000 or Analog Devices SHARC processors in portable test equipment. IC Role / Device Role / Timing Role: Dual-output synchronous buck controller delivering independent, sequenced, low-noise power with PGOOD signaling for processor reset coordination. Use Value: 1.1MHz operation allows <3mm² total inductor area; ±1% reference ensures ADC/DAC reference stability; anti-phase reduces input cap size by 30%. |
Use Scenario: Regulating noisy, unregulated 12–24V AC/DC wall adapter outputs into clean 5V/3.3V rails for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: High-input-voltage dual buck regulator accepting wide-range, low-quality DC input and rejecting line transients via fast current-mode control. Use Value: 3.6V–25V input range accommodates brownout and surge conditions; frequency foldback prevents thermal runaway during sustained overload. |
| Distributed Power Regulation | Cable Modem Power Management |
Use Scenario: Local point-of-load conversion on backplanes or daughter cards where 12V or 24V bus supplies multiple subsystems. IC Role / Device Role / Timing Role: Compact dual regulator generating isolated 1.8V memory and 2.5V PHY rails with independent enable and fault reporting. Use Value: TSSOP package fits dense layouts; exposed pad enables >1.5W dissipation at 125°C ambient; PGOOD signals feed FPGA configuration state machines. |
Use Scenario: Powering DOCSIS 3.1 cable modem SoCs requiring 1.0V CPU, 1.2V DDR, and 3.3V interface rails from a single 12V input. IC Role / Device Role / Timing Role: Dual-channel PMIC with independent soft-start timing to meet DOCSIS power-up sequence compliance (Tstart < 100ms). Use Value: RUN/SS pin programmability enables precise delay between rail startups; 1.1MHz switching avoids interference with downstream RF front-end bands. |
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 3A buck with external sync capability; no dual independent outputs or anti-phase operation | Suitable for single-rail high-current apps only; lacks per-channel PGOOD/RUN/SS | Select only if system requires >1.6A on one rail and space constraints prohibit dual ICs |
| TPS54290PWPR | 2.2MHz dual buck; MOSFET-based (not bipolar); lower max input (20V); no BOOST pin requirement | Better light-load efficiency; requires different layout (no BOOST diodes); not rated for 125°C junction | Prefer for cost-sensitive consumer apps below 85°C ambient; avoid for industrial 125°C designs |
Compared with LTC3631EFE#PBF and TPS54290PWPR, LT3506AIFE#PBF uniquely delivers true dual 1.6A channels with anti-phase ripple cancellation, 25V input support, and guaranteed 125°C operation in a mature TSSOP package - making it optimal for ruggedized industrial and telecom infrastructure where reliability and input voltage margin are critical.
Availability
LT3506AIFE#PBF is available at Aetrix Electronics and suitable for DSP power supplies, wall transformer regulation, and distributed power regulation requiring stable component supply across industrial temperature grades and long production lifecycles.
Supply support for LT3506AIFE#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 and maintains full technical and manufacturing continuity for legacy Linear power products.
The LT3506A series belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for industrial, telecom, and embedded systems needing robust dual-rail conversion from unregulated or wide-range inputs.
FAQ
What is the maximum supported input voltage for LT3506AIFE#PBF?
The absolute maximum VIN rating for LT3506AIFE#PBF is 25V, with recommended continuous operation up to 24V. Operation above 21V at low output voltages (e.g., 0.8V) is limited by minimum duty cycle (15% for LT3506A); transient spikes up to 25V are tolerated per Absolute Maximum Ratings. Always verify thermal performance at high VIN/VOUT ratios.
Does LT3506AIFE#PBF require external BOOST diodes and capacitors?
Yes, LT3506AIFE#PBF requires an external Schottky diode and capacitor on each BOOST pin (Pins 1 and 8) to generate a voltage higher than VIN for full saturation of its internal bipolar NPN switches. Typical implementation uses BAT54A diodes and 10nF–100nF ceramic capacitors placed close to the IC.
Can LT3506AIFE#PBF operate with ceramic output capacitors only?
Yes, LT3506AIFE#PBF is fully compatible with ceramic output capacitors due to its current-mode architecture and lack of ESR dependency for loop stability. For 3.3V/1.6A output, 22μF X5R/X7R ceramics yield <10mVpp ripple; for LT3506A's 1.1MHz, 10μF is sufficient per channel.
How does anti-phase switching benefit LT3506AIFE#PBF system design?
Anti-phase switching in LT3506AIFE#PBF causes input current pulses from each channel to cancel partially, reducing RMS input ripple current by up to 50%. This allows smaller input bulk capacitors, lower EMI filter component values, and relaxed PCB layout constraints for high-density power stages.
Is LT3506AIFE#PBF pin-compatible with the standard LT3506 version?
No, LT3506AIFE#PBF is not pin-compatible with non-A versions. While package and pinout are identical, the LT3506A operates at 1.1MHz (vs. 575kHz) and has reduced maximum duty cycle (78% vs. 89%), requiring re-optimization of inductor value, BOOST capacitor, and loop compensation components for stable operation.
LT3506AIFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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):
- 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-TSSOP-EP
LT3506AIFE#PBF FAQ
1.How can I place an order for LT3506AIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3506AIFE#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 LT3506AIFE#PBF reliable?
The price and inventory of LT3506AIFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3506AIFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3506AIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3506AIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3506AIFE#PBF?
LT3506AIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3506AIFE#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 LT3506AIFE#PBF?
For technical support, including LT3506AIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3506AIFE#PBF requirements.
6.How does Aetrix verify that LT3506AIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3506AIFE#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 LT3506AIFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3506AIFE#PBF?
All LT3506AIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3506AIFE#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 LT3506AIFE#PBF part is unused and in its original packaging.
Return procedure for LT3506AIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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