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Analog Devices Inc. LTC3417AEFE-1#TRPBF
- Part No.:
- LTC3417AEFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AEFE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,252
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Product details
Overview
LTC3417AEFE-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator with 1.5A and 1A output capability, operating at up to 4MHz switching frequency. It delivers adjustable output voltages from 0.8V to 5V per channel, features internal low-RDS(ON) MOSFETs, Power-On-Reset (POR), and phase-selectable operation for input ripple reduction - used in GPS/navigation systems and automotive instrumentation where compact, high-efficiency dual-rail power is required.
For engineers reviewing the LTC3417AEFE-1#TRPBF datasheet, LTC3417AEFE-1#TRPBF pinout, LTC3417AEFE-1#TRPBF application, or LTC3417AEFE-1#TRPBF equivalent, key selection criteria include guaranteed 1.5A/1A output current, 2.25V–5.5V input range, programmable 0.6–4MHz frequency, Burst Mode™ efficiency optimization, and TSSOP-20 package compatibility with thermal performance θJA = 38°C/W.
Technical Context
The LTC3417AEFE-1#TRPBF employs a constant-frequency current-mode architecture with shared oscillator timing across both channels. Its PHASE pin selects in-phase or 180° out-of-phase switching to reduce RMS input current stress, while the FREQ pin supports either fixed 1.5MHz operation or resistor-programmable frequency from 0.6MHz to 4MHz.
Control logic includes three selectable light-load modes via SYNC/MODE: Burst Mode™ (ultra-high efficiency, <35mVP-P ripple), pulse-skipping (low-noise), and forced continuous (fixed-frequency EMI control). The POR pin asserts low when either VFB drops ≥8% below regulation and de-asserts after ~150ms once both outputs recover to within –6% of target.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current (CH1/CH2) | 1.5A / 1A minimum - guarantees full load capability across –40°C to +85°C ambient temperature range. |
| Switching Frequency | Programmable 0.6MHz–4MHz - enables use of sub-2mm-height inductors and ceramic capacitors for space-constrained PCBs. |
| Feedback Reference Voltage | 0.8V ±2% - sets precise output voltage via external resistor divider; enables 0.8V–5V adjustment range per channel. |
| Quiescent Current | 125μA (both channels in sleep mode), <1μA shutdown - extends battery life in always-on portable systems. |
| Power-On-Reset Threshold | –6% to –8% output deviation - provides reliable system-level reset signaling during brownout or startup faults. |
| Thermal Resistance (θJA) | 38°C/W - measured in 20-lead TSSOP package with exposed pad soldered to PCB ground plane. |
Pinout & Package
Package: 20-lead plastic TSSOP with exposed thermal pad (Pin 21 = PGND2/GNDD), rated for –40°C to +85°C operation. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 (Pin 2) | Enable control for CH1 (1.5A) | Logic-high (>0.85V) activates regulator; 0V disables CH1 and reduces quiescent current. |
| VIN1 (Pin 3) | Input supply for CH1 P-channel switch | Connects to main input rail; shares VIN with analog circuitry when VIN2 is used as primary supply. |
| ITH1 (Pin 4) | Error amplifier compensation node for CH1 | Controls peak inductor current limit; voltage range 0–1.5V sets current comparator threshold. |
| VFB1 (Pin 5) | Feedback input for CH1 output | Monitors resistive divider output; regulates to 0.8V reference for precise output voltage setting. |
| VFB2 (Pin 6) | Feedback input for CH2 output | Independent regulation loop for second output; identical 0.8V reference and tolerance as VFB1. |
| ITH2 (Pin 7) | Error amplifier compensation node for CH2 | Separate control path for CH2 current limit; enables independent loop compensation. |
| RUN2 (Pin 8) | Enable control for CH2 (1A) | Independent enable allows staggered startup or single-channel operation for dynamic power management. |
| VIN2 (Pin 9) | Input supply for CH2 P-channel switch & analog core | Serves as primary analog supply; powers internal reference, error amplifiers, and logic circuits. |
| SYNC/MODE (Pin 12) | Mode selection & external clock sync input | Selects Burst Mode™ (high efficiency), pulse-skip (low ripple), or forced continuous (EMI control); accepts external clock for synchronization. |
| POR (Pin 14) | Open-drain Power-On-Reset output | Pulled low if either output falls ≥8% below regulation; remains low for ~150ms after recovery to –6%. |
| FREQ (Pin 15) | Oscillator frequency programming | Tied to VIN for 1.5MHz; resistor-to-GND sets frequency from 0.6MHz to 4MHz per RT = 1.61×10¹¹/fO – 16.586kΩ. |
| PHASE (Pin 17) | Channel phase relationship control | High = CH1 & CH2 in-phase; low = 180° out-of-phase - reduces input capacitor RMS current by up to 30%. |
| SW1 (Pin 18) | CH1 switch node | Connects to CH1 inductor; swings between VIN1 and PGND1; requires low-inductance layout for EMI control. |
| PGND1 (Pin 19) | CH1 N-channel driver ground | Dedicated ground return for CH1 bottom FET; must be routed separately from PGND2/GNDD to minimize noise coupling. |
| PGND2/GNDD (Pins 1,10,11,20 + Exposed Pad 21) | CH2 N-channel driver & digital ground | Multi-pin grounding improves thermal dissipation and reduces ground bounce in dual-output operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous MOSFETs | RDS(ON) = 88mΩ/84mΩ (CH1 top/bottom) and 160mΩ/150mΩ (CH2 top/bottom) at 3.6V - eliminates external Schottky diodes and improves full-load efficiency to 95%. |
| Burst Mode™ operation | Delivers <35mVP-P output ripple at light loads while maintaining >85% efficiency at 1mA - ideal for battery-powered standby states. |
| 180° out-of-phase switching | Reduces input capacitor RMS current by ~25% versus in-phase operation - lowers stress on input bulk capacitor and extends lifetime. |
| Individual RUN pin control | Enables independent channel enable/disable - supports dynamic power sequencing, rail shutdown, and partial-system sleep modes. |
| Low dropout (100% duty cycle) | Supports operation down to VIN – VOUT ≈ 100mV - maintains regulation during battery voltage sag or low-VIN conditions. |
Applications
| GPS/Navigation Systems | Automotive Instrumentation |
|---|---|
Use Scenario: Dual-rail power for RF front-end (1.8V) and baseband processor (2.5V) in compact automotive GPS modules. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing isolated, low-noise, and thermally efficient DC/DC conversion with POR monitoring for system reset integrity. Use Value: Enables single-input (3.6V–5.5V) operation with guaranteed 1.5A/1A outputs, reducing BOM count and PCB area versus discrete solutions. |
Use Scenario: Powering digital cluster displays and sensor interface ICs in instrument panels with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Dual-output regulator delivering stable 3.3V and 5V rails with phase-controlled switching to minimize input ripple and meet automotive EMC standards. Use Value: 180° out-of-phase operation cuts input capacitor RMS current, allowing smaller 1206/0805 ceramics instead of larger tantalums - improving reliability and reducing cost. |
| PC Cards | Industrial Point-of-Load |
Use Scenario: Compact power solution for PCIe Mini Card peripherals requiring 1.2V core and 3.3V I/O rails from 3.3V or 5V host bus. IC Role / Device Role / Timing Role: Dual buck converter with individual RUN control enabling hot-plug sequencing and independent rail enable/disable during card enumeration. Use Value: 4MHz max switching frequency permits use of 1.5μH/2.2μH inductors ≤2mm height - critical for ultra-thin PC card form factors. |
Use Scenario: Distributed power for FPGA I/O banks and ADC/DAC analog supplies in industrial PLC modules with wide ambient temperature range. IC Role / Device Role / Timing Role: Dual regulated output generator supporting precise 0.8V–5V adjustment per rail, with POR signaling for watchdog-triggered system recovery. Use Value: Guaranteed –40°C to +85°C operation and 125μA sleep current ensure long-term reliability in unventilated enclosures with minimal self-heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270RGET | Fixed 1.2V/3.3V outputs; no programmable frequency; higher quiescent current (250μA active) | Targeted at fixed-rail applications only; lacks VFB-adjustable flexibility and POR functionality | Choose when board space is constrained and dual fixed outputs suffice; avoid when adjustable voltage or system reset signaling is required. |
| ISL85412FRTZ-T7A | Single 2A output; no dual-channel integration; supports 4.5–60V input; no POR or phase control | Designed for high-input industrial/motor drives; not suitable for low-voltage dual-rail portable systems | Use only for single-rail, high-VIN applications; cannot replace LTC3417AEFE-1#TRPBF in dual-output designs without redesign. |
Compared with TPS65270RGET and ISL85412FRTZ-T7A, the LTC3417AEFE-1#TRPBF uniquely combines dual independently adjustable outputs, programmable switching frequency, integrated POR, and 180° phase control - making it the only option among the three that supports flexible, low-noise, thermally optimized dual-rail power in space- and battery-sensitive applications.
Availability
LTC3417AEFE-1#TRPBF is available at Aetrix Electronics and suitable for GPS/navigation systems, automotive instrumentation, and industrial point-of-load DC/DC applications requiring stable component supply, extended temperature support, and dual-output flexibility.
Supply support for LTC3417AEFE-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC3417AEFE-1#TRPBF belongs to Linear's high-frequency synchronous buck regulator product line, designed specifically for compact, high-efficiency dual-rail power delivery in portable and automotive electronics where thermal density and EMI control are critical.
FAQ
What is the maximum supported switching frequency for the LTC3417AEFE-1#TRPBF?
The LTC3417AEFE-1#TRPBF supports a maximum switching frequency of 4MHz when configured with an external resistor on the FREQ pin. At this frequency, the device enables use of miniature inductors (≤2mm height) and low-ESR ceramic capacitors, reducing solution size significantly compared to lower-frequency alternatives. Operation above 4MHz is not specified or guaranteed.
Does the LTC3417AEFE-1#TRPBF require external Schottky diodes?
No, the LTC3417AEFE-1#TRPBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs for both channels, with RDS(ON) values of 88mΩ/84mΩ (CH1) and 160mΩ/150mΩ (CH2) at 3.6V. This synchronous rectification eliminates conduction losses associated with external diodes and contributes to peak efficiency reaching 95%.
How does the POR function behave when only one channel is enabled?
When only one channel is enabled (e.g., RUN2 = 0V), the POR pin reflects the regulation status of the active channel only. It pulls low if the enabled channel's VFB drops ≥8% below 0.8V and de-asserts ~150ms after that channel recovers to within –6% of regulation. The disabled channel's output is ignored for POR assertion, ensuring accurate system reset signaling during partial operation.
What is the thermal performance difference between the DFN and TSSOP packages for the LTC3417AEFE-1#TRPBF?
The LTC3417AEFE-1#TRPBF in the 20-lead TSSOP package (FE) has θJA = 38°C/W, while the 16-lead DFN (DHC) version has θJA = 43°C/W. This 5°C/W improvement in the TSSOP variant results from its larger exposed pad (Pin 21) and additional ground pins (Pins 1,10,11,20), enabling better heat spreading across the PCB and lower junction temperatures under identical load and layout conditions.
Can the LTC3417AEFE-1#TRPBF operate with different input voltages on VIN1 and VIN2?
No - the absolute maximum rating specifies |VIN1 – VIN2| ≤ 0.3V. VIN1 and VIN2 must be tied together or closely regulated to within 300mV to prevent damage or malfunction. The device is designed for single-input operation; VIN2 also powers the analog core, so mismatched inputs risk violating internal biasing requirements and exceeding pin voltage limits.
LTC3417AEFE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1A, 1.5A
- Frequency - Switching:
- 1.5MHz, 600kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3417AEFE-1#TRPBF FAQ
1.How can I place an order for LTC3417AEFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AEFE-1#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 LTC3417AEFE-1#TRPBF reliable?
The price and inventory of LTC3417AEFE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3417AEFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3417AEFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AEFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AEFE-1#TRPBF?
LTC3417AEFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AEFE-1#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 LTC3417AEFE-1#TRPBF?
For technical support, including LTC3417AEFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AEFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3417AEFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AEFE-1#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 LTC3417AEFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3417AEFE-1#TRPBF?
All LTC3417AEFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AEFE-1#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 LTC3417AEFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3417AEFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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