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Analog Devices Inc. LTC3417EFE#PBF
- Part No.:
- LTC3417EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,470
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Product details
Overview
LTC3417EFE#PBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator with independent 1.4A and 800mA output channels, operating from 2.25V to 5.5V input, supporting programmable switching frequency up to 4MHz, 0.8V–5V adjustable output voltages, and integrated low-RDS(ON) MOSFETs. It delivers high efficiency-up to 95%-in space-constrained portable electronics such as digital cameras and cellular phones.
For engineers reviewing the LTC3417EFE#PBF datasheet, LTC3417EFE#PBF pinout, LTC3417EFE#PBF application, or LTC3417EFE#PBF equivalent, key selection criteria include its dual-channel current capability, phase-selectable operation, Burst Mode® vs Pulse Skip mode trade-offs, 125μA sleep quiescent current, and TSSOP-20 thermal performance (θJA = 38°C/W).
Technical Context
The LTC3417EFE#PBF implements a constant-frequency current-mode control architecture shared across both channels, with user-selectable 180° out-of-phase operation via the PHASE pin to reduce input RMS current and relax input capacitor derating. Its MODE pin configures three light-load behaviors: Burst Mode® (maximizing efficiency), Pulse Skip (minimizing output ripple), or forced continuous conduction (fixed-frequency noise control).
Each channel features independent RUN enable inputs, dedicated ITH compensation nodes, and VFB pins referenced to a precise 0.8V internal bandgap. The device supports dropout operation at 100% duty cycle and integrates power-good monitoring that asserts low when either output deviates by >6% from regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs without external LDO pre-regulation. |
| Output Current (Ch1 / Ch2) | 1.4A / 800mA - guaranteed minimum per channel, enabling independent powering of core logic and I/O rails in portable systems. |
| Switching Frequency | 0.6MHz to 4MHz - resistor-programmable via FREQ pin; enables use of compact 2mm-height inductors and ceramic capacitors. |
| Feedback Reference Voltage | 0.8V ±2% - sets output voltage via external resistor dividers; allows precise 0.8V–5V adjustment with minimal divider current error. |
| Quiescent Current (Sleep) | 125μA - total for both channels active in low-power sleep mode, extending battery runtime in standby states. |
| Shutdown Current | <1μA - enables full system power gating; critical for zero-leakage off-state in always-on sensor nodes. |
| Power Good Threshold | ±6% deviation from VFB - provides reliable rail-valid signaling for sequenced power-up and fault detection in multi-rail systems. |
Pinout & Package
The LTC3417EFE#PBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE package) with exposed pad (Pin 21) soldered to PCB ground for optimal thermal dissipation (θJA = 38°C/W). Pin 1 is RUN1; Pin 20 is PGND2/GNDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 (Pin 2) | Enable input for 1.4A channel | Logic-high (>0.85V) activates Channel 1; 0V disables it and places SW1 in high-impedance state. |
| 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 | Controls peak inductor current limit; voltage range 0–1.5V determines current threshold dynamically. |
| VFB1 (Pin 5) | Feedback input for Ch1 | Monitors output divider; internal 0.8V reference enables accurate output voltage setting and regulation. |
| VFB2 (Pin 6) | Feedback input for Ch2 | Independent feedback path for 800mA channel; allows asymmetric output configurations (e.g., 1.8V + 2.5V). |
| ITH2 (Pin 7) | Error amplifier compensation node | Separate compensation for Ch2; enables independent loop tuning and stability optimization per rail. |
| RUN2 (Pin 8) | Enable input for 800mA channel | Enables/disables Channel 2 independently; supports dynamic rail sequencing and power domain control. |
| MODE (Pin 12) | Light-load operation mode select | Voltage level selects Burst Mode® (high efficiency), Pulse Skip (low ripple), or forced continuous (EMI-controlled). |
| FREQ (Pin 15) | Oscillator frequency set | Connected to VIN → 1.5MHz; resistor-to-ground → 0.6–4MHz; sets switching speed and component size trade-off. |
| PHASE (Pin 17) | Channel phase relationship control | High = in-phase; low = 180° out-of-phase - reduces input capacitor RMS current and improves thermal distribution. |
| PGOOD (Pin 14) | Open-drain power-good indicator | Asserts low if either VOUT drops >6% below target; shared signal simplifies system-level power monitoring. |
| Exposed Pad (Pin 21) | PGND2/GNDD thermal & electrical ground | Mandatory PCB solder connection; primary thermal path and return for SW2 driver and digital circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent synchronous buck regulators | Enables compact dual-rail power solutions without external diodes or gate drivers-reducing BOM count and board area. |
| 180° out-of-phase switching support | Halves input ripple current magnitude versus in-phase operation, allowing smaller input capacitors and lower ESR requirements. |
| Burst Mode® operation | Achieves >85% efficiency at 100μA load on both channels, extending battery life in intermittent-activity applications like remote sensors. |
| 125μA combined sleep quiescent current | Minimizes standby power loss while retaining fast wake-up response-critical for wearable devices with aggressive energy budgets. |
| Integrated 0.8V reference and current-mode control | Provides excellent line and load transient response (<10μs recovery) without requiring external compensation components. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powering ARM-based application processors and memory interfaces in smartphones with dynamic DVFS scaling. IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering 1.2V/1.4A (core) and 2.8V/800mA (I/O) with independent enable and phase control. Use Value: Enables simultaneous rail sequencing, reduces input capacitor size via out-of-phase operation, and maintains >90% efficiency across 10mA–1.4A load range. | Use Scenario: Supplying image sensor analog front-end and high-speed DSP in compact digital cameras. IC Role / Device Role / Timing Role: Provides low-noise 2.5V/800mA for sensor bias and clean 1.8V/1.4A for digital processing with Pulse Skip mode during preview mode. Use Value: Delivers <15mVpp output ripple at light loads using Pulse Skip, preserving image SNR while minimizing heat in sealed enclosures. |
| Wireless Modem RF Bias | PDA System Rail Generator |
Use Scenario: Generating stable 3.3V and 1.8V supplies for LTE/Wi-Fi transceivers and baseband ICs in embedded modems. IC Role / Device Role / Timing Role: Supplies regulated rails with fast transient response to handle bursty RF transmit events; PGOOD signals enable safe TX enable timing. Use Value: Maintains <±1% output regulation during 500mA load steps (100ns rise time), preventing RF spectral regrowth or desense. | Use Scenario: Consolidating multiple discrete regulators into a single IC for legacy PDA platforms with tight height constraints (<2.5mm). IC Role / Device Role / Timing Role: Replaces two separate TSSOP-16 buck converters with one 20-lead TSSOP part, freeing PCB real estate for larger batteries. Use Value: Reduces solution height to ≤2.0mm using 2mm-height inductors and ceramic caps, meeting mechanical stack-up limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65286RHAR | Higher input range (2.7–5.5V); fixed 1.2V/1.8V outputs; no programmable frequency; integrated LDO for auxiliary rail. | Best suited for fixed-voltage, low-BOM-count designs where flexibility is secondary to integration density. | Select when needing a pre-configured dual-buck + LDO solution and can accept narrower VIN min. |
| MP2491DS-LF-Z | Single-channel only (3A); no second output; higher max frequency (2.2MHz); lower IQ (25μA shutdown). | Requires two ICs to match dual-rail capability; better for cost-sensitive, single-rail applications with ultra-low shutdown leakage. | Choose only if redesigning for single-rail architecture or prioritizing sub-1μA shutdown over dual-channel integration. |
Compared with TPS65286RHAR and MP2491DS-LF-Z, the LTC3417EFE#PBF uniquely offers independently adjustable dual outputs, resistor-programmable frequency up to 4MHz, and selectable light-load modes-all in a thermally optimized TSSOP-20 package, making it optimal for flexible, high-efficiency portable power designs.
Availability
LTC3417EFE#PBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core supply, wireless modem RF bias, and PDA system rail generation requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for LTC3417EFE#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. (including former Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and power conversion markets.
The LTC3417 product line was designed specifically for medium-power, dual-output portable applications demanding high efficiency, small solution size, and flexible light-load behavior-targeting battery-powered consumer and industrial edge devices.
FAQ
What is the maximum supported switching frequency for the LTC3417EFE#PBF?
The LTC3417EFE#PBF supports a maximum switching frequency of 4MHz when configured with an appropriate resistor from the FREQ pin to ground. At this frequency, the device enables use of miniature inductors (≤2mm height) and low-profile ceramic capacitors, reducing overall solution footprint and height-ideal for ultra-thin portable designs. Operation above 4MHz is not specified or guaranteed.
How does the PHASE pin affect input capacitor sizing in the LTC3417EFE#PBF?
The PHASE pin on the LTC3417EFE#PBF selects between in-phase or 180° out-of-phase operation of the two channels. When set to 0V (out-of-phase), input RMS current is reduced by up to 25% compared to in-phase mode-allowing use of smaller input capacitors with lower RMS current ratings. This directly lowers cost, footprint, and thermal stress on the input bulk capacitor.
Can the LTC3417EFE#PBF operate with only one channel enabled?
Yes, the LTC3417EFE#PBF supports independent channel control: pulling RUN1 low disables Channel 1 while keeping Channel 2 active, and vice versa. In half-active mode, total quiescent current drops to 260–400μA. This enables dynamic power partitioning-for example, powering only the display rail during sleep while keeping the main processor rail off-without requiring external isolation components.
What is the function of the ITH1 and ITH2 pins on the LTC3417EFE#PBF?
The ITH1 and ITH2 pins on the LTC3417EFE#PBF serve as the error amplifier output nodes for Channels 1 and 2, respectively. They directly control the peak inductor current limit by setting the current comparator threshold. Applying external compensation networks (e.g., RC filters) to these pins allows fine-tuning of loop stability and transient response-critical for maintaining regulation under fast load steps or with high-ESR output capacitors.
Does the LTC3417EFE#PBF require external Schottky diodes?
No, the LTC3417EFE#PBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs for both buck channels, eliminating conduction losses associated with external diodes and improving full-load efficiency by up to 5% compared to asynchronous alternatives. This also reduces thermal design complexity and bill-of-materials count.
LTC3417EFE#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:
- 800mA, 1.4A
- 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
LTC3417EFE#PBF FAQ
1.How can I place an order for LTC3417EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417EFE#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 LTC3417EFE#PBF reliable?
The price and inventory of LTC3417EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3417EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3417EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417EFE#PBF?
LTC3417EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417EFE#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 LTC3417EFE#PBF?
For technical support, including LTC3417EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417EFE#PBF requirements.
6.How does Aetrix verify that LTC3417EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3417EFE#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 LTC3417EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3417EFE#PBF?
All LTC3417EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417EFE#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 LTC3417EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3417EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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