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Analog Devices Inc. LTC3417AIFE-1#TRPBF
- Part No.:
- LTC3417AIFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AIFE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
LTC3417AIFE-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 integrated low-RDS(ON) P- and N-channel MOSFETs, and includes Power-On-Reset (POR), phase control, and programmable light-load modes. It is designed for space-constrained medium-power point-of-load applications such as automotive instrumentation and GPS systems.
For engineers reviewing the LTC3417AIFE-1#TRPBF datasheet, LTC3417AIFE-1#TRPBF pinout, LTC3417AIFE-1#TRPBF application, or LTC3417AIFE-1#TRPBF equivalent, key selection criteria include its dual-channel current-mode architecture, 2.25V–5.5V input range, 100μA quiescent current in dropout, 180° out-of-phase operation capability, and TSSOP-20 package with exposed thermal pad.
Technical Context
The LTC3417AIFE-1#TRPBF employs a constant-frequency current-mode control architecture shared across both channels, with independent RUN pins enabling individual channel enable/disable. Its FREQ pin supports fixed 1.5MHz operation or resistor-programmable frequency from 0.6MHz to 4MHz, while the SYNC/MODE pin selects Burst Mode (high efficiency), pulse-skip mode (low ripple), or forced continuous mode (fixed-frequency noise).
Phase relationship between channels is controlled via the PHASE pin-logic high enables in-phase switching; logic low enables 180° out-of-phase operation, reducing RMS input current and input capacitor stress. The POR pin provides open-drain reset assertion when either output falls ≥8% below regulation, with 150ms de-assertion delay after recovery.
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 pre-regulation |
| Output Current (CH1 / CH2) | 1.5A / 1A guaranteed minimum - enables driving moderate-power digital cores and I/O rails simultaneously |
| Switching Frequency | Programmable 0.6MHz–4MHz - allows optimization of inductor size vs. efficiency; 4MHz enables <2mm-height magnetics |
| Feedback Reference Voltage | 0.8V ±2% - sets precise output regulation point; enables 0.8V–5V adjustment using standard resistor dividers |
| Quiescent Current (Active) | 400–600μA - minimizes standby power loss in battery-backed systems |
| Shutdown Current | <1μA - ensures negligible battery drain during system sleep or off-states |
| Peak Switch RDS(ON) (CH1) | 0.088Ω (top), 0.084Ω (bottom) at 3.6V - reduces conduction loss and thermal rise under full load |
| Power-On-Reset Threshold | –6% to –8% VFB deviation - provides reliable fault detection with hysteresis for stable system boot sequencing |
Pinout & Package
The LTC3417AIFE-1#TRPBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE) with an exposed pad (Pin 21) soldered to PCB ground for optimal thermal performance (θJA = 38°C/W). Pin count and layout match the LTC3417A-1 family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 (Pin 2) | Enable control for 1.5A channel | Logic-high (>0.85V) activates CH1; 0V disables CH1 and places it in sleep mode |
| VIN1 (Pin 3) | Input supply for CH1 P-MOSFET | Connects directly to input source; must be decoupled locally with low-ESR ceramic capacitor |
| ITH1 (Pin 4) | Error amplifier compensation node for CH1 | Controls peak inductor current limit; external RC network sets loop stability and transient response |
| VFB1 (Pin 5) | Feedback input for CH1 output voltage | Monitors resistive divider output; internal 0.8V reference enables precise output setting |
| VFB2 (Pin 6) | Feedback input for CH2 output voltage | Independent regulation path for second output; same 0.8V reference as VFB1 |
| ITH2 (Pin 7) | Error amplifier compensation node for CH2 | Separate compensation for CH2 allows independent loop tuning per output |
| RUN2 (Pin 8) | Enable control for 1A channel | Enables/disables CH2 independently; both RUN pins low = full shutdown (<1μA IQ) |
| VIN2 (Pin 9) | Input supply for CH2 P-MOSFET and analog core | Shared input for CH2 switch and internal bias circuitry; requires local decoupling |
| SYNC/MODE (Pin 12) | Mode selection & external clock sync | Voltage level selects Burst/Pulse-Skip/Forced Continuous; also accepts external clock for synchronization |
| SW2 (Pin 13) | Switch node for CH2 | Connects to CH2 inductor; swings between VIN2 and PGND2; requires tight layout to minimize EMI |
| POR (Pin 14) | Open-drain Power-On-Reset output | Pulled low if either VOUT drops ≥8%; releases ~150ms after both outputs recover to within –6% |
| FREQ (Pin 15) | Oscillator frequency control | Tied to VIN → 1.5MHz; resistor to GND → 0.6–4MHz; sets timing ramp current for internal oscillator |
| GNDA (Pin 16) | Analog ground reference | Return for internal analog circuits; must be connected to clean ground plane, separate from power grounds |
| PHASE (Pin 17) | Channel phase relationship control | High = CH1 & CH2 in-phase; low = 180° out-of-phase; reduces input ripple and capacitor stress |
| SW1 (Pin 18) | Switch node for CH1 | Connects to CH1 inductor; swings between VIN1 and PGND1; critical for layout and thermal management |
| PGND1 (Pin 19) | Power ground for CH1 N-MOSFET driver | Low-impedance return path for CH1 switch current; must tie to exposed pad and main ground plane |
| PGND2/GNDD (Pins 1,10,11,20) | Power/digital ground for CH2 and logic | Multiple pins reduce ground impedance; all must connect to exposed pad and system ground |
| Exposed Pad (Pin 21) | Thermal & electrical ground | Must be soldered to large PCB copper area for thermal dissipation and low-noise grounding |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent RUN controls | Enables selective activation of 1.5A or 1A channel - supports dynamic power partitioning and sequenced startup |
| 180° out-of-phase switching | Reduces RMS input current by up to 30% versus in-phase operation - lowers input capacitor sizing and stress |
| Burst Mode® operation | Achieves >90% efficiency at 1mA load - extends battery runtime in always-on sensor or monitoring subsystems |
| Integrated low-RDS(ON) MOSFETs | Eliminates need for external Schottky diodes - simplifies BOM, improves reliability, and reduces board area |
| 0.8V feedback reference with ±2% tolerance | Supports accurate low-voltage outputs (e.g., 1.0V, 1.2V, 1.8V) required by modern SoCs and FPGAs |
| 100% duty cycle dropout operation | Maintains regulation down to VIN ≈ VOUT - critical for brownout resilience in portable and automotive applications |
Applications
| GPS/Navigation Systems | Automotive Instrumentation |
|---|---|
Use Scenario: Powering RF front-end, baseband processor, and display backlight in compact automotive GPS modules. IC Role / Device Role / Timing Role: Dual-output DC/DC regulator delivering [email protected] to processor core and 2.5V@1A to RF transceiver and memory interface. Use Value: 4MHz operation enables ultra-compact 1.5μH/2.2μH inductors; Burst Mode extends battery life during vehicle ignition-off tracking. | Use Scenario: Supplying microcontroller, CAN transceiver, and LCD driver in digital instrument clusters. IC Role / Device Role / Timing Role: Primary point-of-load regulator generating [email protected] for MCU and 5.0V@1A for analog sensors and displays. Use Value: 125°C-rated TSSOP package withstands under-hood thermal environments; POR ensures safe MCU reset during cold-cranking voltage sag. |
| Industrial Power Supplies | General Purpose Point of Load DC/DC |
Use Scenario: Providing isolated auxiliary rails in programmable logic controllers (PLCs) and industrial gateways. IC Role / Device Role / Timing Role: Dual-channel buck converter powering FPGA I/O banks (1.2V) and communication PHYs (2.5V or 3.3V) from 5V or 12V intermediate bus. Use Value: Phase control minimizes input ripple on shared 5V bus; programmable frequency avoids noise coupling into sensitive analog measurement circuits. | Use Scenario: Replacing discrete LDOs or older buck ICs in embedded computing modules requiring multiple optimized voltage rails. IC Role / Device Role / Timing Role: High-efficiency, small-footprint dual regulator supporting heterogeneous SoC power domains (core, memory, I/O). Use Value: Integrated MOSFETs and 0.8V reference simplify design; 20-pin TSSOP offers easy rework and compatibility with standard SMT assembly lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270RGET | Fixed 1.2V/3.3V outputs; no programmable frequency; lower max input (5.5V); 1.2A/1.2A rating | Suitable for fixed-rail applications only; lacks POR, phase control, and wide VOUT adjustability | Select when cost-sensitive designs require simple dual-rail generation without flexibility |
| MP2491DS-LF-Z | Single-channel 2A buck; no dual output, no POR, no phase control; higher IQ (300μA active) | Requires two ICs to replicate dual functionality; increases board area and BOM count | Choose only if single-rail requirement exists and footprint constraints allow dual placement |
Compared with TPS65270RGET and MP2491DS-LF-Z, the LTC3417AIFE-1#TRPBF uniquely combines dual independent outputs, 0.6–4MHz programmability, POR, and 180° phase control in a single 20-pin TSSOP - enabling compact, flexible, and robust multi-rail power in thermally demanding environments.
Availability
LTC3417AIFE-1#TRPBF is available at Aetrix Electronics and suitable for GPS navigation systems, automotive instrumentation, and industrial PLCs requiring stable component supply, extended temperature support (–40°C to +125°C), and long-term production continuity.
Supply support for LTC3417AIFE-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 industrial, automotive, communications, and aerospace markets.
The LTC3417A-1 product line was engineered for high-density, medium-power point-of-load conversion in thermally constrained environments - emphasizing efficiency across load range, flexible sequencing, and robust fault handling for mission-critical embedded systems.
FAQ
What is the maximum supported switching frequency for the LTC3417AIFE-1#TRPBF?
The LTC3417AIFE-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 in height and low-profile ceramic capacitors, making it ideal for space-constrained applications. Operation above 4MHz is not specified or guaranteed.
Does the LTC3417AIFE-1#TRPBF require external Schottky diodes?
No, the LTC3417AIFE-1#TRPBF does not require external Schottky diodes. It integrates low-RDS(ON) P-channel and N-channel MOSFETs for both synchronous rectification paths, eliminating conduction losses and thermal overhead associated with external diodes. This integration reduces component count, improves efficiency, and enhances reliability in the LTC3417AIFE-1#TRPBF design.
How does the POR function behave when only one channel is enabled on the LTC3417AIFE-1#TRPBF?
When only one channel is enabled (e.g., RUN1 = high, RUN2 = low), the POR pin monitors only the active channel's output. If that output falls ≥8% below regulation, POR asserts low. Once the active output recovers to within –6% of target, POR de-asserts after ~150ms. The disabled channel's undervoltage condition does not trigger POR in this configuration - ensuring accurate reset signaling in partial-power states for the LTC3417AIFE-1#TRPBF.
What is the purpose of the PHASE pin on the LTC3417AIFE-1#TRPBF?
The PHASE pin on the LTC3417AIFE-1#TRPBF selects the relative switching timing between the two channels: logic high configures in-phase operation; logic low configures 180° out-of-phase switching. Out-of-phase operation reduces RMS input current and input capacitor ripple, lowering stress on the input bulk capacitor and improving overall system efficiency - a key advantage in shared-input applications for the LTC3417AIFE-1#TRPBF.
Can the LTC3417AIFE-1#TRPBF operate with input voltage below 2.25V?
No, the LTC3417AIFE-1#TRPBF has a specified minimum input voltage of 2.25V. Below this threshold, the undervoltage lockout (UVLO) circuit disables operation to prevent unstable regulation or erratic behavior. The UVLO turn-on threshold is guaranteed at 2.07V (ramping up), but full functional specification - including output accuracy, current capability, and efficiency - begins only at 2.25V, as defined in the datasheet for the LTC3417AIFE-1#TRPBF.
LTC3417AIFE-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3417AIFE-1#TRPBF FAQ
1.How can I place an order for LTC3417AIFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AIFE-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 LTC3417AIFE-1#TRPBF reliable?
The price and inventory of LTC3417AIFE-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 LTC3417AIFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3417AIFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AIFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AIFE-1#TRPBF?
LTC3417AIFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AIFE-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 LTC3417AIFE-1#TRPBF?
For technical support, including LTC3417AIFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AIFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3417AIFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AIFE-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 LTC3417AIFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3417AIFE-1#TRPBF?
All LTC3417AIFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AIFE-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 LTC3417AIFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3417AIFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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