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Analog Devices Inc. LTC3417AIFE-2#PBF
- Part No.:
- LTC3417AIFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AIFE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:444
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Product details
Overview
LTC3417AIFE-2#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator IC with independent 1.5A and 1A output capability, operating from 2.25V to 5.5V input, programmable switching frequency up to 4MHz, internal low-RDS(ON) MOSFETs, and selectable Burst Mode™ or Pulse Skip operation for light-load efficiency optimization. It serves as a compact, high-efficiency point-of-load power solution in space-constrained portable electronics.
For engineers reviewing the LTC3417AIFE-2#PBF datasheet, LTC3417AIFE-2#PBF pinout, LTC3417AIFE-2#PBF application, or LTC3417AIFE-2#PBF equivalent, this page delivers verified technical context, exact pin functions per TSSOP-20 package, confirmed efficiency curves (up to 95%), real-world mode trade-offs (Burst vs Pulse Skip), and validated alternative parts for dual-output buck regulation in automotive instrumentation and GPS systems.
Technical Context
The LTC3417AIFE-2#PBF implements a constant-frequency current-mode control architecture shared across both channels, with independent error amplifiers (ITH1/ITH2), feedback references (VFB1/VFB2 = 0.8V ±2%), and peak-current limiting (ILIM1 = 2.5A typ, ILIM2 = 1.7A typ). Its dual-regulator design supports in-phase or 180° out-of-phase switching via the PHASE pin to reduce input RMS current stress.
Operation modes are selected via SYNC/MODE pin voltage: >VIN–0.5V enables Burst Mode™ (low IQ = 125μA sleep, <1μA shutdown), <0.5V selects Pulse Skip (low ripple <35mVP-P), and VIN/2 forces continuous conduction. Dropout is supported via 100% duty cycle with P-channel MOSFETs fully on, maintaining regulation down to VIN ≈ VOUT.
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 rails without pre-regulation. |
| Output Current Capability | Channel 1: 1.5A min, Channel 2: 1A min - guaranteed minimum load current with thermal derating per TSSOP-20 θJA = 38°C/W. |
| Switching Frequency | Programmable 0.6MHz–4MHz or fixed 1.5MHz - enables use of sub-2mm-height inductors and ceramic capacitors. |
| Feedback Reference Voltage | VFB1/VFB2 = 0.8V ±2% - sets adjustable output range from 0.8V to 5V using external resistor dividers. |
| Quiescent Current | 125μA in Sleep (Burst Mode), <1μA in Shutdown - extends battery runtime in always-on portable systems. |
| Efficiency Peak | Up to 95% at mid-load - achieved via integrated 88mΩ/84mΩ (SW1) and 160mΩ/150mΩ (SW2) synchronous MOSFETs, eliminating Schottky losses. |
| Power Good Output | PGOOD asserts high when both outputs are within ±6% of target - provides system-level rail monitoring without external comparators. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE package), 4.4mm × 6.5mm × 1.1mm body, exposed thermal pad (Pin 21 = PGND2/GNDD) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GNDD (Pins 1, 10, 11, 20) | Digital & SW2 N-channel ground reference | Provides low-impedance return path for 1A channel switching and digital logic; must be tied to system ground plane. |
| RUN1 (Pin 2) | Enable control for 1.5A regulator | Logic-high (>0.85V) activates Channel 1; 0V disables it and contributes to global shutdown when RUN2 also low. |
| VIN1 (Pin 3) | Input supply for 1.5A P-channel switch | Accepts 2.25V–5.5V input; separate from VIN2 to allow independent input sourcing or sequencing. |
| ITH1 (Pin 4) | Error amplifier output for Channel 1 | Controls peak inductor current; nominal 0–1.5V range sets current limit threshold dynamically during regulation. |
| VFB1 (Pin 5) | Feedback input for Channel 1 | Monitors resistive divider output; regulates VOUT1 to 0.8V reference - sets output voltage as VOUT1 = 0.8V × (1 + R1/R2). |
| VFB2 (Pin 6) | Feedback input for Channel 2 | Same function as VFB1 but for 1A channel; enables independent output voltage programming (e.g., 1.8V + 2.5V). |
| ITH2 (Pin 7) | Error amplifier output for Channel 2 | Independent compensation node for Channel 2; allows tailored loop response for differing load dynamics. |
| RUN2 (Pin 8) | Enable control for 1A regulator | Enables/disables Channel 2; combined with RUN1, determines active channel count and total quiescent current. |
| VIN2 (Pin 9) | Input supply for 1A P-channel switch & analog circuitry | Primary power for Channel 2 and internal bias circuits; may be same or different source than VIN1. |
| SYNC/MODE (Pin 12) | Mode selection & external clock sync input | Selects Burst Mode™ (high), Pulse Skip (low), or Forced Continuous (mid); also accepts external clock up to 4MHz. |
| FREQ (Pin 15) | Oscillator frequency set input | Connect to VIN for 1.5MHz; connect RT resistor to GND for 0.6–4MHz - sets timing ramp current for internal oscillator. |
| PHASE (Pin 17) | Channel phase relationship control | High = in-phase switching; 0V = 180° out-of-phase - reduces input capacitor RMS current by up to 30% in dual-output designs. |
| PGOOD (Pin 14) | Open-drain power-good status output | Pulled low if either VOUT1 or VOUT2 falls >6% below target - signals system controller of rail fault or enable sequencing failure. |
| SW1 (Pin 18) | 1.5A switch node | Connects to inductor L1; swings between VIN1 and PGND1 - requires low-inductance layout and ceramic decoupling. |
| SW2 (Pin 13) | 1A switch node | Connects to inductor L2; swings between VIN2 and PGND2 - independent routing prevents cross-talk between channels. |
| PGND1 (Pin 19) | 1.5A N-channel driver ground | Dedicated ground return for SW1 path; must be routed separately from GNDD to minimize noise coupling into analog circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates external Schottky diodes and associated losses - improves efficiency by 5–10% over asynchronous designs at 1A–1.5A loads. |
| Three selectable light-load modes | Burst Mode™ (125μA IQ), Pulse Skip (<35mVP-P ripple), Forced Continuous (fixed-frequency noise) - lets designers optimize for battery life, EMI, or transient response. |
| 180° out-of-phase operation | Reduces input capacitor RMS current by ~25% versus in-phase - lowers required CIN size and extends capacitor lifetime in dual-rail systems. |
| Individual RUN pin control | Enables dynamic channel enable/disable - supports power sequencing, adaptive load management, and partial-system sleep states. |
| Internal soft-start | 1024-cycle ramp-up of peak inductor current - prevents inrush current and output overshoot during startup or wake-from-sleep events. |
| Thermally enhanced TSSOP | θJA = 38°C/W with exposed pad soldered - sustains 1.5A/1A continuous output at ambient up to 85°C without forced air. |
Applications
| GPS/Navigation Systems | Automotive Instrumentation |
|---|---|
Use Scenario: Dual-rail power for GPS RF front-end (1.8V) and baseband processor (2.5V) in compact automotive telematics modules. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise supplies with fast transient response to handle bursty GPS signal acquisition. Use Value: Burst Mode™ extends battery backup runtime; 180° phase shift minimizes input ripple on shared 3.3V vehicle bus, reducing EMI filter size. |
Use Scenario: Powering digital cluster microcontroller (1.8V) and CAN transceiver interface (2.5V) in dashboard instrument panels. IC Role / Device Role / Timing Role: Dual-output buck converter providing independent, sequenced power domains with PGOOD monitoring for functional safety compliance. Use Value: RUN1/RUN2 control enables safe power-up/down sequencing; -40°C to 125°C rating meets AEC-Q100 Grade 1 requirements for under-hood environments. |
| PC Cards | Industrial Point-of-Load |
Use Scenario: Compact power solution for PCIe Mini Card peripherals requiring 1.5A core voltage and 1A I/O voltage in space-limited add-in cards. IC Role / Device Role / Timing Role: High-frequency (up to 4MHz) regulator enabling sub-2mm-height magnetics and minimal PCB area usage. Use Value: Programmable frequency avoids sensitive RF bands; TSSOP-20 footprint fits standard card edge connector keep-out zones. |
Use Scenario: Distributed power for FPGA I/O banks (2.5V) and auxiliary logic (1.8V) in industrial PLC backplanes with wide input voltage variation. IC Role / Device Role / Timing Role: Robust dual-buck regulator supporting 2.25V–5.5V input range and ±6% PGOOD detection for system health monitoring. Use Value: 100% duty cycle dropout operation maintains regulation during brownouts; low 2.07V UVLO threshold prevents premature shutdown. |
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; higher IQ (250μA in PFM) | Predefined dual-rail outputs simplify design but lack flexibility for custom voltages like 1.8V/2.5V | Choose when fixed outputs match system needs and board space is less constrained than for LTC3417AIFE-2#PBF's TSSOP-20. |
| ISL95210IRZ | Supports up to 3A/2A per channel; requires external MOSFETs; no integrated PGOOD | Higher current capability suits demanding CPU cores but increases BOM count and layout complexity | Choose for >1.5A loads where discrete FETs are acceptable; avoid when seeking single-chip simplicity and PGOOD integration. |
Compared with TPS65270RGET and ISL95210IRZ, the LTC3417AIFE-2#PBF uniquely balances programmable outputs (0.8V–5V), ultra-low light-load IQ (125μA), integrated PGOOD, and compact TSSOP-20 packaging - making it optimal for dual-rail portable and automotive applications where flexibility, efficiency, and footprint are jointly critical.
Availability
LTC3417AIFE-2#PBF is available at Aetrix Electronics and suitable for GPS navigation modules, automotive instrument clusters, and industrial PC card power systems requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term production continuity.
Supply support for LTC3417AIFE-2#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3417A series was designed specifically for medium-power dual-output DC/DC conversion in space-constrained portable and automotive electronics, emphasizing high efficiency across load ranges, flexible mode selection, and robust thermal performance in thermally enhanced packages.
FAQ
What is the maximum switching frequency supported by the LTC3417AIFE-2#PBF?
The LTC3417AIFE-2#PBF supports a maximum switching frequency of 4MHz when configured with an external resistor on the FREQ pin. At this frequency, it enables use of ultra-compact inductors ≤2mm in height and small ceramic capacitors, ideal for dense PCB layouts in portable devices. Operation above 4MHz is not specified or guaranteed.
Does the LTC3417AIFE-2#PBF require external Schottky diodes?
No, the LTC3417AIFE-2#PBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs for both channels, eliminating conduction losses and heat generation associated with external diodes. This integration directly contributes to its peak 95% efficiency and simplified bill-of-materials.
How does the PHASE pin affect input capacitor stress in the LTC3417AIFE-2#PBF?
When the PHASE pin is pulled low (0V), the LTC3417AIFE-2#PBF configures Channel 2 to switch 180° out-of-phase with Channel 1. This reduces input RMS current by up to 30%, lowering thermal stress and ripple voltage on the shared input capacitor - allowing smaller, lower-cost CIN solutions in dual-output designs.
What is the guaranteed output current capability of each channel in the LTC3417AIFE-2#PBF?
The LTC3417AIFE-2#PBF guarantees a minimum output current of 1.5A for Channel 1 and 1A for Channel 2 across the full –40°C to 125°C operating temperature range, provided the TSSOP-20 package's exposed pad is properly soldered to the PCB ground plane for thermal management per θJA = 38°C/W.
Can the LTC3417AIFE-2#PBF operate with only one channel enabled?
Yes, the LTC3417AIFE-2#PBF supports single-channel operation via independent RUN1 and RUN2 pins. When only RUN1 is high, Channel 1 delivers up to 1.5A while Channel 2 is disabled, drawing only 260–400μA total supply current. This feature enables dynamic power scaling and partial-system sleep in battery-powered applications.
LTC3417AIFE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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):
- 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-2#PBF FAQ
1.How can I place an order for LTC3417AIFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AIFE-2#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 LTC3417AIFE-2#PBF reliable?
The price and inventory of LTC3417AIFE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3417AIFE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3417AIFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AIFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AIFE-2#PBF?
LTC3417AIFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AIFE-2#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 LTC3417AIFE-2#PBF?
For technical support, including LTC3417AIFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AIFE-2#PBF requirements.
6.How does Aetrix verify that LTC3417AIFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AIFE-2#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 LTC3417AIFE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3417AIFE-2#PBF?
All LTC3417AIFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AIFE-2#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 LTC3417AIFE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3417AIFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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