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Analog Devices Inc. LTC3417AIFE-1#PBF
- Part No.:
- LTC3417AIFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AIFE-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LTC3417AIFE-1#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator IC designed for medium-power point-of-load conversion. It delivers 1.5A and 1A output currents respectively, operates from 2.25V to 5.5V input, supports programmable switching frequency up to 4MHz, features integrated low-RDS(ON) MOSFETs, and includes Power-On-Reset (POR) with ±6% threshold detection - used in automotive instrumentation and GPS navigation systems.
For engineers reviewing the LTC3417AIFE-1#PBF datasheet, LTC3417AIFE-1#PBF pinout, LTC3417AIFE-1#PBF application, or LTC3417AIFE-1#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to 20-lead TSSOP, real-world efficiency vs. load curves, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The LTC3417AIFE-1#PBF implements a constant-frequency current-mode control architecture shared across both channels, with independent RUN pins enabling asymmetric channel enablement and soft-start sequencing. Its PHASE pin selects in-phase or 180° out-of-phase operation to reduce input RMS current stress.
Switching frequency is set either by tying FREQ to VIN (1.5MHz) or via external resistor (0.6–4MHz), while SYNC/MODE pin configures Burst Mode (high light-load efficiency), pulse-skip mode (low ripple), or forced continuous mode (fixed-frequency noise). POR asserts low when either VFB falls ≥8% below 0.8V reference and de-asserts after ~150ms post-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 Capability | Channel 1: 1.5A min; Channel 2: 1A min - guaranteed minimum delivery under full temperature range. |
| Feedback Reference Voltage | 0.8V ±2% - sets output voltage via external resistive divider; enables 0.8V–5V adjustable regulation. |
| Switching Frequency Range | 0.6MHz–4MHz (resistor-programmable) or 1.5MHz (internal default) - allows optimization of size vs. efficiency. |
| Quiescent Current | 125μA in Sleep Mode; <1μA in Shutdown - extends battery life in always-on portable systems. |
| Power-On-Reset Threshold | –6% to –8% deviation from VFB nominal - detects output undervoltage with hysteresis and fixed 150ms delay. |
| Top-Switch RDS(ON) | 0.088Ω (CH1), 0.16Ω (CH2) at 3.6V - enables >95% peak efficiency without external Schottky diodes. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package), thermally enhanced with exposed pad (Pin 21 = PGND2/GNDD), rated for –40°C to +125°C operating temperature.
| 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 enters sleep mode. |
| VIN1 (Pin 3) | Input supply for CH1 P-MOSFET | Connects to main input rail; powers top switch and internal gate drivers for CH1. |
| ITH1 (Pin 4) | Error amplifier compensation node | Controls peak inductor current; voltage range 0–1.5V directly modulates current limit. |
| VFB1 (Pin 5) | Feedback input for CH1 | Monitors output divider; comparator references 0.8V to regulate CH1 output voltage. |
| VFB2 (Pin 6) | Feedback input for CH2 | Same function as VFB1 but for 1A channel; independent regulation loop. |
| ITH2 (Pin 7) | Error amplifier compensation node | Same role as ITH1 but for CH2; decouples compensation between channels. |
| RUN2 (Pin 8) | Enable control for 1A channel | Independent enable/disable of CH2; both RUN pins low places device in shutdown. |
| VIN2 (Pin 9) | Input supply for CH2 P-MOSFET & analog core | Powers CH2 switches and internal reference/bias circuitry; may be tied to VIN1. |
| SYNC/MODE (Pin 12) | Mode selection & external clock sync | Voltage level selects Burst/Pulse-skip/Forced Continuous; also accepts external clock signal. |
| POR (Pin 14) | Open-drain Power-On-Reset output | Pulled low if either VFB drops ≥8%; releases high after ~150ms once both outputs recover to –6%. |
| FREQ (Pin 15) | Oscillator frequency programming | Tied to VIN → 1.5MHz; resistor to GND → 0.6–4MHz; determines inductor/capacitor sizing. |
| PHASE (Pin 17) | Channel phase relationship control | High = in-phase switching; Low = 180° out-of-phase - reduces input capacitor RMS current. |
| SW1 (Pin 18) | Switch node for CH1 | Connects to CH1 inductor; swings between VIN1 and PGND1; requires low-inductance layout. |
| PGND1 (Pin 19) | Power ground for CH1 N-MOSFET driver | Separate ground return path for CH1 power stage; must be connected to PCB ground plane. |
| PGND2/GNDD (Pins 1,10,11,20,21) | Digital & CH2 power ground | Exposed pad (Pin 21) is mandatory solder connection to PCB ground for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent RUN controls | Enables staggered startup, asymmetric load management, and per-channel sleep mode with individual soft-start. |
| 180° out-of-phase operation | Reduces input capacitor RMS current by up to 30% versus in-phase mode - lowers stress and required capacitance. |
| Burst Mode® operation | Achieves >85% efficiency at 100μA load (CH1) - critical for battery-powered standby functionality. |
| Integrated low-RDS(ON) MOSFETs | Eliminates need for external Schottky diodes and associated board space, BOM count, and conduction losses. |
| Programmable POR delay | Fixed ~150ms de-assertion window after fault recovery - ensures stable system reset timing across voltage transients. |
| Dropout operation at 100% duty cycle | Maintains regulation down to VIN ≈ VOUT + ILOAD×RDS(ON) - supports brownout resilience in low-voltage systems. |
Applications
| Automotive Instrument Clusters | GPS Navigation Modules |
|---|---|
Use Scenario: Powering LCD display, microcontroller, and RF front-end in vehicle dashboards with wide input voltage swing (cold crank to load dump). IC Role / Device Role / Timing Role: Dual-output buck regulator supplying 1.8V @ 1.5A (MCU core) and 2.5V @ 1A (RF IC & memory) from 5V or 3.3V rail. Use Value: Out-of-phase operation minimizes input ripple on shared 5V bus; POR ensures clean MCU reset during engine start transient. |
Use Scenario: Compact GNSS receiver requiring ultra-low quiescent current and tight output regulation under varying satellite signal conditions. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 3.3V @ 1.5A (baseband processor) and 1.2V @ 1A (RF LNA) from single-cell Li-ion (2.7–4.2V). Use Value: Burst Mode maintains >87% efficiency at 50μA load; 0.8V feedback reference enables precise low-voltage rail generation. |
| Industrial PC Cards | General-Purpose Point-of-Load |
Use Scenario: Power management for PCIe-based data acquisition cards where space, thermal density, and EMI are constrained. IC Role / Device Role / Timing Role: Dual-channel regulator generating 1.0V @ 1.5A (FPGA core) and 3.3V @ 1A (I/O bank) from 5V backplane. Use Value: 4MHz max switching frequency allows use of 1.5×1.5mm inductors; TSSOP package fits narrow card edge layouts. |
Use Scenario: Flexible intermediate power stage in multi-rail embedded systems needing configurable, reliable, and compact DC/DC conversion. IC Role / Device Role / Timing Role: Secondary regulator deriving 1.2V and 1.8V rails from 3.3V or 5V system supply in test equipment or IoT gateways. Use Value: Independent RUN pins allow dynamic rail sequencing; 125°C temp grade supports convection-cooled industrial enclosures. |
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 |
|---|---|---|---|
| TPS65270PWP | Fixed 1.2V/3.3V outputs; no programmable frequency; higher 2.95–6.5V input range; 1.2A/1.2A rating. | Suitable for fixed-rail systems only; lacks adjustable VOUT and fine-grained light-load mode control. | Select when fixed outputs and wider VIN simplify design; avoid when adjustable outputs or sub-100μA efficiency matter. |
| ISL85415EVAL1Z | Single-channel 5A buck; no dual output or POR; supports 3–40V input; includes PMBus interface. | Requires two ICs to replicate dual-rail function; adds digital control complexity but enables telemetry and margining. | Choose for high-current single rails or when digital monitoring justifies added cost and layout overhead. |
Compared with TPS65270PWP and ISL85415EVAL1Z, the LTC3417AIFE-1#PBF uniquely combines dual adjustable outputs, programmable frequency up to 4MHz, integrated POR with hysteresis, and sub-100μA Burst Mode efficiency - making it optimal for space-constrained, battery-sensitive, and dynamically sequenced applications.
Availability
LTC3417AIFE-1#PBF is available at Aetrix Electronics and suitable for automotive instrumentation, GPS navigation modules, and industrial PC cards requiring stable component supply, extended temperature support (–40°C to +125°C), and long-term production continuity.
Supply support for LTC3417AIFE-1#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 series was engineered for compact, efficient dual-output DC/DC conversion in battery-powered and thermally constrained systems - emphasizing low quiescent current, flexible light-load operation, and robust fault signaling via POR.
FAQ
What is the maximum supported switching frequency for LTC3417AIFE-1#PBF?
The LTC3417AIFE-1#PBF 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 ceramic capacitors while maintaining stable current-mode control. Operation above 4MHz is not specified or guaranteed.
Does LTC3417AIFE-1#PBF require external Schottky diodes?
No, the LTC3417AIFE-1#PBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs with low RDS(ON) (0.088Ω/0.084Ω for CH1, 0.16Ω/0.15Ω for CH2), eliminating conduction losses and board space associated with external diodes - a key feature confirmed in the datasheet's "No Schottky Diodes Required" feature list.
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 monitors only the active channel's VFB. The LTC3417AIFE-1#PBF datasheet explicitly states that POR reflects regulation status of the running regulator - meaning it will assert low if the enabled channel's output deviates ≥8% from 0.8V, regardless of the disabled channel's state.
What is the thermal performance difference between the DFN and TSSOP packages for LTC3417AIFE-1#PBF?
The LTC3417AIFE-1#PBF in the 20-lead TSSOP (FE) package has θJA = 38°C/W, compared to 43°C/W for the 16-lead DFN (DHC) variant. This 5°C/W improvement enhances thermal reliability in high-ambient or high-power-density layouts, especially when the exposed pad (Pin 21) is properly soldered to a large PCB ground plane.
Can LTC3417AIFE-1#PBF operate with different input voltages on VIN1 and VIN2?
No - the absolute maximum rating specifies |VIN1 – VIN2| ≤ 0.3V, and the datasheet defines operation only for VIN1 = VIN2. Applying significantly different voltages risks violating internal bias constraints and is not supported. Both inputs must be tied to the same source or tightly regulated rails within 300mV.
LTC3417AIFE-1#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-1#PBF FAQ
1.How can I place an order for LTC3417AIFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AIFE-1#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-1#PBF reliable?
The price and inventory of LTC3417AIFE-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3417AIFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AIFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AIFE-1#PBF?
LTC3417AIFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AIFE-1#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-1#PBF?
For technical support, including LTC3417AIFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AIFE-1#PBF requirements.
6.How does Aetrix verify that LTC3417AIFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AIFE-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3417AIFE-1#PBF?
All LTC3417AIFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AIFE-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3417AIFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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