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Analog Devices Inc. LTC3417AEFE-2#PBF
- Part No.:
- LTC3417AEFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AEFE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:13,328
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Product details
Overview
LTC3417AEFE-2#PBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator with 1.5A and 1A output channels, operating from 2.25V to 5.5V input. It delivers adjustable output voltages from 0.8V to 5V per channel, supports programmable switching frequency up to 4MHz, and integrates low RDS(ON) P-channel and N-channel MOSFETs for high efficiency without external Schottky diodes. It is used in GPS/navigation systems and automotive instrumentation where compact, efficient dual-rail power conversion is required.
For engineers reviewing the LTC3417AEFE-2#PBF datasheet, LTC3417AEFE-2#PBF pinout, LTC3417AEFE-2#PBF application, or LTC3417AEFE-2#PBF equivalent, key selection considerations include its dual-channel current-mode control, phase-selectable operation (in-phase or 180° out-of-phase), Burst Mode™ vs Pulse Skip mode trade-offs, and TSSOP-20 package thermal performance (θJA = 38°C/W).
Technical Context
The LTC3417AEFE-2#PBF employs a constant-frequency current-mode architecture shared across both channels, with independent error amplifiers (ITH1/ITH2), feedback inputs (VFB1/VFB2), and enable controls (RUN1/RUN2). Its PHASE pin selects synchronous or anti-phase switching to reduce input RMS current stress, while the SYNC/MODE pin configures Burst Mode™ (high light-load efficiency), Pulse Skip (low ripple), or forced continuous operation.
It features internal soft-start, power-good monitoring (±6% VFB threshold), undervoltage lockout (2.07V to 2.25V), and dropout operation at 100% duty cycle. The FREQ pin enables either fixed 1.5MHz operation (tied to VIN) or resistor-programmed frequency from 0.6MHz to 4MHz - critical for optimizing inductor/capacitor size versus efficiency in space-constrained designs.
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 system rails without pre-regulation. |
| Output Current (Ch1 / Ch2) | 1.5A / 1A guaranteed minimum - enables powering core logic and I/O rails simultaneously from one IC. |
| Switching Frequency | Programmable 0.6MHz–4MHz - allows use of sub-2mm-height inductors and low-ESR ceramic capacitors. |
| Feedback Reference Voltage | 0.8V ±2% - sets precise output regulation via external resistor dividers; stable over temperature and line/load. |
| Quiescent Current (Active) | 400–600μA - minimizes standby power in battery-backed applications like GPS modules. |
| Shutdown Current | <1μA - ensures negligible battery drain during system sleep states. |
| Efficiency (Peak) | Up to 95% - achieved via integrated 88mΩ/84mΩ (Ch1) and 160mΩ/150mΩ (Ch2) synchronous switches. |
| Thermal Resistance (θJA) | 38°C/W - measured for TSSOP-20 package; enables 1.5W+ dissipation with moderate PCB copper area. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE package), 4.4mm × 6.5mm × 1.2mm body height, exposed pad (Pin 21) connected to PGND2/GNDD and required to be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 10, 11, 20 (PGND2/GNDD) | Digital & SW2 N-channel ground return | Low-impedance path for 1A channel switch node current and digital logic reference; shares exposed pad. |
| Pin 2 (RUN1) | Enable input for 1.5A regulator | Logic-high (>0.85V) activates Channel 1; 0V disables it and contributes to full shutdown when paired with RUN2. |
| Pin 3 (VIN1) | Input supply for Ch1 P-channel switch | Must be decoupled locally; supplies gate drive and high-side switch; separate from VIN2 for rail isolation. |
| Pin 4 (ITH1) | Error amplifier compensation node (Ch1) | Voltage-controlled current limit threshold (0–1.5V range); used for loop compensation and stability tuning. |
| Pin 5 (VFB1) | Feedback input for Ch1 output | Monitors resistive divider output; regulates to 0.8V reference; determines final VOUT1 value. |
| Pin 6 (VFB2) | Feedback input for Ch2 output | Independent regulation node for second output; identical 0.8V reference; enables dual independent voltage rails. |
| Pin 7 (ITH2) | Error amplifier compensation node (Ch2) | Separate control for Ch2 current limit and loop dynamics; allows independent compensation per channel. |
| Pin 8 (RUN2) | Enable input for 1A regulator | Independent control of Channel 2; enables staggered startup or selective rail shutdown. |
| Pin 9 (VIN2) | Input supply for Ch2 P-channel switch & analog circuitry | Primary power for analog core and Ch2 high-side switch; may differ from VIN1 in multi-rail systems. |
| Pin 12 (SYNC/MODE) | Mode selection & external clock sync input | Selects Burst Mode™ (high efficiency), Pulse Skip (low noise), or forced continuous; accepts external clock for synchronization. |
| Pin 13 (SW2) | Switch node for Ch2 inductor | Swings between VIN2 and PGND2; requires low-inductance layout and local ceramic decoupling. |
| Pin 14 (PGOOD) | Open-drain power-good status output | Pulled low if either VOUT deviates >6% from target; active only when corresponding RUN pin is high. |
| Pin 15 (FREQ) | Frequency programming input | Tied to VIN for 1.5MHz; resistor-to-ground sets 0.6–4MHz - directly scales component size vs conduction loss. |
| Pin 16 (GNDA) | Analog ground reference | Isolated ground for internal references and error amplifiers; must be connected to clean analog ground plane. |
| Pin 17 (PHASE) | Channel phase relationship control | High = in-phase switching; 0V = 180° out-of-phase - reduces input capacitor RMS current by ~30% in anti-phase mode. |
| Pin 18 (SW1) | Switch node for Ch1 inductor | Swings between VIN1 and PGND1; distinct from SW2; requires dedicated high-current routing. |
| Pin 19 (PGND1) | Ground for SW1 N-channel driver | Low-impedance return for 1.5A channel; separate from PGND2 to minimize cross-talk between channels. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode regulators | Enables simultaneous, stable regulation of two different output voltages (e.g., 1.8V core + 2.5V I/O) with fast transient response. |
| 180° out-of-phase switching capability | Reduces input capacitor RMS current by up to 30%, lowering stress and enabling smaller, lower-ESR input capacitors. |
| Burst Mode™ operation | Achieves >85% efficiency at 100μA load (Ch1), extending battery life in always-on GPS or telematics modules. |
| Integrated low-RDS(ON) MOSFETs | Eliminates need for external Schottky diodes - reduces BOM count, board area, and thermal hotspots. |
| Individual RUN pin control per channel | Supports flexible power sequencing, dynamic rail disabling, and fault-isolation without external logic. |
| Power-good monitoring with ±6% accuracy | Provides reliable system-level power validation before processor or FPGA initialization sequences begin. |
Applications
| GPS/Navigation Systems | Automotive Instrumentation |
|---|---|
Use Scenario: Powering GNSS baseband processor (1.8V) and RF front-end (2.5V) from a single 3.6V Li-ion cell in portable navigation devices. IC Role / Device Role / Timing Role: Dual-output step-down regulator delivering tightly regulated, low-noise rails with independent enable control and phase optimization for minimal input ripple. Use Value: Eliminates need for two discrete converters, reducing solution size by 40% and improving battery runtime via Burst Mode™ efficiency at standby currents <1mA. |
Use Scenario: Supplying microcontroller core (1.2V) and CAN transceiver (3.3V) in digital instrument clusters with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck regulator with Pulse Skip mode selection to maintain low output ripple (<35mVP-P) under varying load conditions while meeting automotive CISPR-25 Class 5 emissions. Use Value: Achieves <100mV output ripple at full load without additional LC filtering, simplifying compliance testing and reducing bill-of-materials cost. |
| PC Cards (PCMCIA/ExpressCard) | Industrial Point-of-Load Supplies |
Use Scenario: Generating 1.5V and 3.3V rails from 5V host bus in hot-pluggable PC Card peripherals with tight height constraints (<2mm). IC Role / Device Role / Timing Role: Compact dual-buck converter in TSSOP-20 package supporting 4MHz switching to enable 1.5μH/2.2μH shielded inductors under 2mm height. Use Value: Enables full functionality within 5.5mm card thickness envelope while maintaining >90% efficiency across 10mA–1.5A load range. |
Use Scenario: Providing isolated 1.8V FPGA core and 2.5V memory interface rails in programmable logic controllers with wide ambient temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade dual regulator with guaranteed –40°C to +85°C operation, robust UVLO (2.07V), and thermal shutdown protection. Use Value: Ensures reliable startup and regulation even during brownout events on 3.3V backplane supplies, preventing FPGA configuration corruption. |
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 quiescent current (250μA active) | Targeted at fixed-rail applications like DSP power; lacks independent RUN pins and phase control | Choose when output voltages are fixed and design simplicity outweighs flexibility needs. |
| ISL85415EVAL1Z | Single-channel 5A buck; requires two ICs for dual-rail; supports 2.7–5.5V input but no Burst Mode™ | Higher per-rail current capability; better suited for asymmetric loads >1.5A | Choose when individual rail currents exceed 1.5A/1A or when independent thermal management is critical. |
Compared with TPS65270RGET and ISL85415EVAL1Z, the LTC3417AEFE-2#PBF provides unique value through its dual-channel programmability, 180° phase control for input capacitor derating, and ultra-low shutdown current (<1μA), making it optimal for battery-sensitive dual-rail systems where flexibility and efficiency are prioritized over fixed-output simplicity or raw current headroom.
Availability
LTC3417AEFE-2#PBF 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 (–40°C to +85°C), and long-term production continuity.
Supply support for LTC3417AEFE-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 (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 LTC3417A-2 product line was designed for compact, high-efficiency dual-rail power conversion in space-constrained portable and automotive electronics, emphasizing low quiescent current, flexible mode selection, and robust thermal performance in standard surface-mount packages.
FAQ
What is the maximum supported switching frequency for the LTC3417AEFE-2#PBF?
The LTC3417AEFE-2#PBF supports a maximum switching frequency of 4MHz when configured with an external resistor from the FREQ pin to ground. At this frequency, it enables use of very small inductors (e.g., 1.5μH) and ceramic capacitors while maintaining stable regulation - ideal for ultra-thin portable designs. Operation above 4MHz is not specified or guaranteed.
Does the LTC3417AEFE-2#PBF require external Schottky diodes?
No, the LTC3417AEFE-2#PBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs for both channels, with typical RDS(ON) values of 88mΩ/84mΩ (Ch1) and 160mΩ/150mΩ (Ch2) at 3.6V input. This internal synchronous rectification achieves up to 95% efficiency and eliminates reverse recovery losses and associated thermal concerns.
How does the PHASE pin affect input capacitor stress in the LTC3417AEFE-2#PBF?
When the PHASE pin is pulled low (0V), the LTC3417AEFE-2#PBF operates its two channels 180° out-of-phase, reducing input capacitor RMS current by up to 30% compared to in-phase operation. This directly lowers thermal stress and allows use of smaller, lower-ESR input capacitors - a critical advantage in high-density layouts where input bulk capacitance space is constrained.
What are the key differences between Burst Mode™ and Pulse Skip mode on the LTC3417AEFE-2#PBF?
Burst Mode™ operation on the LTC3417AEFE-2#PBF maximizes light-load efficiency (e.g., >85% at 100μA) by intermittently activating switching cycles, but introduces higher output voltage ripple (~35mVP-P). Pulse Skip mode maintains constant-frequency operation down to low loads, delivering significantly lower ripple (<15mVP-P) at the expense of reduced efficiency below ~10mA - selected via the SYNC/MODE pin voltage level.
Is the LTC3417AEFE-2#PBF pin-compatible with other variants in the LTC3417A-2 family?
Yes, the LTC3417AEFE-2#PBF is pin-compatible with the LTC3417AEDHC-2#PBF (DFN-16) and LTC3417AIFE-2#PBF (TSSOP-20, industrial temp), sharing identical pin functions and electrical behavior. However, thermal performance differs: the TSSOP-20 package (LTC3417AEFE-2#PBF) has θJA = 38°C/W, while the DFN-16 variant has θJA = 43°C/W - requiring appropriate layout adjustments for thermal management.
LTC3417AEFE-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3417AEFE-2#PBF FAQ
1.How can I place an order for LTC3417AEFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AEFE-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 LTC3417AEFE-2#PBF reliable?
The price and inventory of LTC3417AEFE-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 LTC3417AEFE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3417AEFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AEFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AEFE-2#PBF?
LTC3417AEFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AEFE-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 LTC3417AEFE-2#PBF?
For technical support, including LTC3417AEFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AEFE-2#PBF requirements.
6.How does Aetrix verify that LTC3417AEFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AEFE-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 LTC3417AEFE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3417AEFE-2#PBF?
All LTC3417AEFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AEFE-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 LTC3417AEFE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3417AEFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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