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Analog Devices Inc. LTC3417AIFE#PBF
- Part No.:
- LTC3417AIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AIFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
LTC3417AIFE#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 in space-constrained systems. It delivers 1.5A and 1A output currents respectively, operates from 2.25V to 5.5V input, supports programmable switching frequency up to 4MHz, and features independent RUN control, phase-selectable operation, and 0.8V feedback reference for precise output regulation - used in GPS modules, digital cameras, and DSL modems.
For engineers reviewing the LTC3417AIFE#PBF datasheet, LTC3417AIFE#PBF pinout, LTC3417AIFE#PBF application, or LTC3417AIFE#PBF equivalent, key selection considerations include its dual-channel current-mode architecture, 180° out-of-phase capability for reduced input RMS current, Burst Mode® vs Pulse Skip mode trade-offs, and TSSOP-20 package thermal performance with exposed pad grounding.
Technical Context
The LTC3417AIFE#PBF implements a constant-frequency, current-mode control architecture shared across both channels, with synchronized clocking and user-selectable phase relationship (in-phase or 180° out-of-phase) via the PHASE pin. Its dual error amplifiers drive ITH1/ITH2 pins to regulate peak inductor current based on VFB1/VFB2 feedback against a 0.8V reference.
Mode selection (Burst Mode®, Pulse Skip, or Forced Continuous) is controlled by voltage level on the SYNC/MODE pin, directly affecting light-load efficiency and output ripple. Dropout operation enables 100% duty cycle with only 125µA total quiescent current, while internal low-RDS(ON) P- and N-channel MOSFETs eliminate external Schottky diodes.
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 | 1.5A (CH1) / 1A (CH2) - guaranteed minimum per channel with internal switch RDS(ON) of 88mΩ/160mΩ (top) and 84mΩ/150mΩ (bottom). |
| Switching Frequency | Programmable 0.6MHz–4MHz via FREQ pin resistor - enables optimization of inductor size (≤2mm height) and efficiency. |
| Feedback Reference Voltage | 0.8V ±2% - sets output voltage range from 0.8V to 5V using external resistor dividers; low drift supports stable regulation. |
| Quiescent Current | 125µA in Sleep Mode (both channels active), <1µA in Shutdown - extends battery life in portable equipment. |
| Power Good Output | Open-drain PGOOD with –6% threshold detection on either VOUT - provides system-level power sequencing and fault indication. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer embedded applications with full electrical specs over range. |
Pinout & Package
The LTC3417AIFE#PBF is packaged in a 20-lead plastic TSSOP with exposed thermal pad (Pin 21 = PGND2/GNDD), optimized for thermal dissipation (θJA = 38°C/W). Pin numbering follows standard JEDEC TSSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 (Pin 2) | Enable control for CH1 (1.5A) | Logic-high (>0.85V) activates CH1; 0V disables CH1 and places it in sleep mode. |
| VIN1 (Pin 3) | Input supply for CH1 high-side switch | Connects to main input rail; must be decoupled locally to minimize noise coupling into analog circuitry. |
| ITH1 (Pin 4) | Error amplifier output for CH1 | Controls peak inductor current; compensation network connects here to stabilize loop response. |
| VFB1 (Pin 5) | Feedback input for CH1 output | Monitors resistive divider output; regulated to 0.8V reference for accurate VOUT1 setting. |
| VFB2 (Pin 6) | Feedback input for CH2 output | Independent regulation node for CH2; identical 0.8V reference enables dual-rail flexibility. |
| ITH2 (Pin 7) | Error amplifier output for CH2 | Separate compensation path allows independent loop tuning for each channel. |
| RUN2 (Pin 8) | Enable control for CH2 (1A) | Independent enable allows asymmetric power-up sequencing or dynamic channel disable. |
| VIN2 (Pin 9) | Input supply for CH2 and analog core | Shared input for CH2 switch and internal bias; requires low-impedance local decoupling. |
| SYNC/MODE (Pin 12) | Mode selection & external clock sync | Voltage level selects Burst Mode® (high), Pulse Skip (low), or Forced Continuous (mid); also accepts external clock. |
| PGOOD (Pin 14) | Power-good status indicator | Open-drain output pulled low if either VOUT deviates >6% from target - used for system reset or sequencing logic. |
| FREQ (Pin 15) | Oscillator frequency set input | Connect to VIN for 1.5MHz fixed freq; connect RT resistor to GND for 0.6–4MHz programmability. |
| PHASE (Pin 17) | Channel phase relationship control | High = CH2 in-phase with CH1; low = CH2 180° out-of-phase - reduces input capacitor RMS current. |
| SW1 (Pin 18) | CH1 switch node | Connects to CH1 inductor; swings between VIN1 and PGND1 - requires tight layout to minimize EMI. |
| PGND1 (Pin 19) | CH1 low-side switch ground | Dedicated ground return for CH1 N-MOSFET; must be routed separately from PGND2/GNDD to avoid crosstalk. |
| PGND2/GNDD (Pins 1,10,11,20 + Exposed Pad) | CH2 low-side & digital ground | Multi-pin ground net including exposed thermal pad - must be soldered to large PCB copper area for thermal and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent RUN controls | Enables asymmetric power sequencing, dynamic channel disabling, and partial-system sleep without firmware intervention. |
| 180° out-of-phase operation | Reduces input capacitor RMS current by up to 30% compared to in-phase mode - lowers required CIN rating and size. |
| Burst Mode® and Pulse Skip modes | Delivers >90% efficiency at 1mA load (Burst) or <10mVPP ripple at light loads (Pulse Skip) - selectable per system noise/efficiency priority. |
| Internal low-RDS(ON) MOSFETs | Eliminates need for external Schottky diodes - simplifies BOM, improves reliability, and reduces board area. |
| 0.8V precision feedback reference | Supports accurate low-voltage outputs (e.g., 1.2V, 1.0V, 0.9V) with standard resistor tolerances - critical for modern SoC core rails. |
| 100% duty cycle dropout operation | Maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON) - extends usable battery voltage range in portable devices. |
Applications
| GPS/Navigation Module Power | Digital Camera Core Rail |
|---|---|
Use Scenario: Dual-rail power for GPS RF front-end (2.8V) and baseband processor (1.2V) in compact handheld navigation units. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing isolated, low-noise, sequenced outputs with minimal footprint. Use Value: Enables single-input (3.3V/3.6V battery) solution with 180° phase shift to reduce input capacitor stress and meet tight EMI limits. |
Use Scenario: Powering image sensor (1.8V) and ISP (2.5V) in DSLR or mirrorless camera subsystems requiring fast transient response. IC Role / Device Role / Timing Role: High-efficiency dual buck converter with independent RUN control for dynamic power gating during standby. Use Value: Burst Mode® operation extends battery runtime during viewfinder idle; Pulse Skip mode ensures clean power during image capture. |
| PC Card Interface Power | DSL Modem Line Card |
Use Scenario: Generating 3.3V and 1.8V rails for PCMCIA/ExpressCard host controller and peripheral logic in legacy laptop expansion slots. IC Role / Device Role / Timing Role: Compact dual-output regulator supporting hot-plug insertion with soft-start and PGOOD sequencing. Use Value: Internal soft-start prevents inrush current; PGOOD enables safe enumeration before host software initialization. |
Use Scenario: Providing isolated 1.2V (PHY) and 3.3V (controller) supplies in ADSL/VDSL line cards operating from 5V or 12V intermediate bus. IC Role / Device Role / Timing Role: Medium-power dual buck with wide VIN range and robust thermal design for convection-cooled telecom chassis. Use Value: TSSOP-20 package with exposed pad meets IPC-2221 Class B thermal requirements; 4MHz max freq supports ultra-small magnetics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270PWP | Fixed 1.2MHz/2.2MHz dual frequency; no programmable phase; higher quiescent current (250µA sleep) | Lacks 180° phase control and Burst Mode® - less optimal for low-noise, battery-sensitive designs | Prefer when fixed-frequency simplicity and TI ecosystem support outweigh phase flexibility needs. |
| ISL95210IRZ | Higher current (3A/2A), integrated telemetry, but larger QFN-32 package and no Burst Mode® | Targeted at CPU VRM applications with telemetry; lacks light-load efficiency optimization for portable use | Choose for high-current, telemetry-enabled systems where footprint and ultra-low µA sleep are secondary. |
Compared with TPS65270PWP and ISL95210IRZ, the LTC3417AIFE#PBF uniquely balances ultra-low quiescent current (125µA), 180° phase control for input filtering, and three selectable light-load modes - making it optimal for space-constrained, battery-powered dual-rail systems requiring both efficiency and noise control.
Availability
LTC3417AIFE#PBF is available at Aetrix Electronics and suitable for GPS navigation modules, digital camera subsystems, and DSL modem line cards requiring stable component supply, long-term industrial temperature support, and consistent TSSOP-20 packaging.
Supply support for LTC3417AIFE#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 and maintains full technical and manufacturing continuity for the LTC portfolio, delivering high-performance power management ICs with industry-leading efficiency and integration.
The LTC3417AIFE#PBF belongs to Linear's high-frequency synchronous buck regulator product line, engineered for compact, efficient point-of-load conversion in portable and telecom infrastructure where thermal density, light-load efficiency, and dual-rail flexibility are critical.
FAQ
What is the maximum supported switching frequency for the LTC3417AIFE#PBF?
The LTC3417AIFE#PBF supports a maximum switching frequency of 4MHz when configured with an external resistor from the FREQ pin to ground. At this frequency, the device enables use of ultra-low-profile inductors (≤2mm height) and small ceramic capacitors, ideal for space-constrained applications like digital cameras and GPS modules. The LTC3417AIFE#PBF achieves stable operation up to 4MHz due to its optimized gate drivers and current-mode control loop bandwidth.
How does the PHASE pin affect input capacitor sizing in the LTC3417AIFE#PBF?
The PHASE pin on the LTC3417AIFE#PBF selects whether Channel 2 operates in-phase or 180° out-of-phase with Channel 1. When set to 180° out-of-phase, input ripple currents partially cancel, reducing RMS input current by up to 30% compared to in-phase operation. This allows smaller input capacitors with lower RMS current ratings - a key benefit in compact DSL modem and PC card designs where board area is constrained. The LTC3417AIFE#PBF datasheet provides explicit RMS current equations for both configurations.
Can the LTC3417AIFE#PBF operate with only one channel enabled?
Yes, the LTC3417AIFE#PBF supports independent channel control via RUN1 and RUN2 pins. Either channel can be disabled while the other remains fully operational - for example, powering only the 1.5A rail for a GPS baseband processor while disabling the 1A rail during camera sensor standby. In half-active mode, total quiescent current drops to 260–400µA, preserving battery life. The LTC3417AIFE#PBF maintains full regulation and protection features (overcurrent, PGOOD) on the active channel.
What is the feedback reference voltage tolerance for the LTC3417AIFE#PBF?
The LTC3417AIFE#PBF has a nominal feedback reference voltage of 0.8V with a guaranteed tolerance of ±2% (0.784V to 0.816V) over the full –40°C to +85°C temperature range. This tight tolerance enables accurate output voltage regulation for low-voltage rails such as 1.0V or 1.2V used in modern processors and sensors. The LTC3417AIFE#PBF maintains this specification under all operating conditions, including Burst Mode® and Pulse Skip modes, ensuring consistent performance across load and temperature.
Does the LTC3417AIFE#PBF require external Schottky diodes?
No, the LTC3417AIFE#PBF integrates synchronous P-channel and N-channel MOSFETs for both channels, eliminating the need for external Schottky diodes. Its low RDS(ON) switches (e.g., 88mΩ/84mΩ for CH1) provide high efficiency across the load range while reducing component count, board area, and thermal complexity. This integration is confirmed in the LTC3417AIFE#PBF datasheet's "Features" section and functional diagram, and applies to all operating modes including Burst Mode® and dropout.
LTC3417AIFE#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
LTC3417AIFE#PBF FAQ
1.How can I place an order for LTC3417AIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AIFE#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#PBF reliable?
The price and inventory of LTC3417AIFE#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3417AIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AIFE#PBF?
LTC3417AIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AIFE#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#PBF?
For technical support, including LTC3417AIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AIFE#PBF requirements.
6.How does Aetrix verify that LTC3417AIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AIFE#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3417AIFE#PBF?
All LTC3417AIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AIFE#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#PBF part is unused and in its original packaging.
Return procedure for LTC3417AIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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