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Analog Devices Inc. LTC3417AEFE#TRPBF
- Part No.:
- LTC3417AEFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3417AEFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A/1.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
LTC3417AEFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator IC with independent 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- and N-channel MOSFETs for high efficiency without external Schottky diodes-used in compact point-of-load power supplies for portable digital cameras and wireless modems.
For engineers reviewing the LTC3417AEFE#TRPBF datasheet, LTC3417AEFE#TRPBF pinout, LTC3417AEFE#TRPBF application, or LTC3417AEFE#TRPBF equivalent, key selection criteria 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 20-lead TSSOP thermal performance (θJA = 38°C/W).
Technical Context
The LTC3417AEFE#TRPBF employs a constant-frequency, current-mode architecture with shared oscillator timing across both channels. Its PHASE pin configures second-channel switching alignment relative to the first-enabling either in-phase or 180° out-of-phase operation to reduce input RMS current and relax input capacitor derating requirements.
Frequency is set via FREQ pin: tied to VIN for 1.5MHz fixed operation, or resistor-connected to ground for 0.6MHz–4MHz adjustment. The SYNC/MODE pin selects among Burst Mode® (high light-load efficiency), Pulse Skip (low ripple at light loads), or forced continuous mode (fixed-frequency noise profile), applying identically to both regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and logic-supply rails without pre-regulation. |
| Output Current | Channel 1: 1.5A min; Channel 2: 1A min - enables independent powering of core logic and I/O rails. |
| Switching Frequency | 0.6MHz–4MHz (resistor-programmable) or 1.5MHz (VIN-tied) - allows optimization of inductor size vs. efficiency. |
| Feedback Voltage | 0.8V ±2% - standard reference enabling precise output regulation with common resistor-divider ratios. |
| RDS(ON) Top Switch | 0.088Ω (CH1), 0.16Ω (CH2) at 3.6V - minimizes conduction loss and dropout voltage under load. |
| Quiescent Current | 125µA (both channels in sleep), <1µA (shutdown) - extends battery runtime in always-on subsystems. |
| Power Good Output | Open-drain PGOOD with –6% threshold - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE package), thermally enhanced with exposed pad (Pin 21 = PGND2/GNDD), θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 (Pin 2) | Enable for 1.5A regulator | Logic-high (>0.85V) activates CH1; 0V disables CH1 and contributes to full shutdown when paired with RUN2. |
| VIN1 (Pin 3) | Input supply for CH1 P-MOSFET | Connects directly to input rail; must be decoupled locally to handle high di/dt switching currents. |
| ITH1 (Pin 4) | Error amplifier compensation node for CH1 | Controls peak inductor current; voltage range 0–1.5V sets current limit threshold dynamically. |
| 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 compensation node for CH2 | Same functional role as ITH1 but for CH2; allows independent loop compensation. |
| RUN2 (Pin 8) | Enable for 1A regulator | Enables/disables CH2 independently; both RUN pins low places device in <1µA shutdown. |
| VIN2 (Pin 9) | Input supply for CH2 P-MOSFET & analog circuitry | Shared input for CH2 and internal bias; requires low-impedance local decoupling. |
| SYNC/MODE (Pin 12) | Mode selection & external clock sync input | Voltage level selects Burst Mode® (>VIN–0.5V), Pulse Skip (<0.5V), or forced continuous (≈VIN/2); also accepts external clock. |
| FREQ (Pin 15) | Oscillator frequency programming | Resistor-to-ground sets frequency from 0.6–4MHz; tied to VIN selects 1.5MHz fixed operation. |
| PHASE (Pin 17) | CH2 switching phase control | High = CH1/CH2 in-phase; low = 180° out-of-phase - reduces input capacitor RMS current by up to 29%. |
| PGOOD (Pin 14) | Power-good status output | Open-drain signal pulled low if either VOUT deviates >6% from target - used for system reset or enable sequencing. |
| SW1 (Pin 18) | CH1 switch node | Connects to CH1 inductor; swings between VIN1 and PGND1 - requires tight layout to minimize EMI. |
| SW2 (Pin 13) | CH2 switch node | Connects to CH2 inductor; swings between VIN2 and PGND2 - separate ground return path prevents coupling. |
| PGND1 (Pin 19) | CH1 N-MOSFET source return | Dedicated ground for CH1 power stage - must be routed separately from analog and CH2 grounds. |
| PGND2/GNDD (Pins 1,10,11,20) | CH2 N-MOSFET source & digital ground | Multi-pin ground for CH2 power stage and digital logic - connected to exposed pad (Pin 21) for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode control | Enables fast transient response on both outputs with minimal interaction - critical for mixed-signal SoC power domains. |
| 180° out-of-phase operation | Reduces input RMS current by ~29%, allowing smaller input capacitors and lower ESR requirements in space-constrained designs. |
| Burst Mode® with 125µA quiescent current | Extends battery life in standby by minimizing gate charge losses while maintaining regulation - ideal for always-on sensor nodes. |
| No external Schottky diodes required | Integrated synchronous rectification eliminates diode forward drop and thermal management overhead - simplifies BOM and layout. |
| Individual soft-start via RUN pins | Each channel ramps output voltage independently over 1024 clock cycles - prevents inrush current conflicts during multi-rail sequencing. |
Applications
| Portable Digital Cameras | Wireless Modems |
|---|---|
Use Scenario: Dual-rail power for CMOS image sensor (1.8V/1.5A) and baseband processor (2.5V/1A) in compact handheld camera modules. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise DC power with independent enable control per rail. Use Value: Enables simultaneous high-current sensor operation and low-ripple processor supply using a single IC - reducing board area by 40% vs. discrete solutions. | Use Scenario: Powering RF transceiver (3.3V/1A) and digital baseband (1.2V/1.5A) in LTE/5G client modems with strict EMI limits. IC Role / Device Role / Timing Role: Dual-output buck converter with selectable Pulse Skip mode to suppress switching noise near sensitive RF front-end. Use Value: Achieves <10mVpp output ripple at light loads without external filters - eliminating need for additional LDO post-regulation. |
| PC Card Interfaces | GPS Navigation Modules |
Use Scenario: Providing 3.3V/1A and 1.8V/1.5A to PCMCIA/CardBus peripherals in industrial data acquisition systems. IC Role / Device Role / Timing Role: Compact, thermally efficient dual-buck regulator supporting hot-plug insertion and rapid power-up sequencing. Use Value: 38°C/W θJA and 100% duty-cycle dropout operation ensure stable 3.3V output even as input drops to 3.4V - preventing brownouts during bus transients. | Use Scenario: Supplying GPS baseband (1.8V/1.5A) and RF frontend (3.0V/1A) in automotive-grade navigation units with wide temperature range. IC Role / Device Role / Timing Role: Dual-channel regulator with –40°C to +85°C guaranteed operation and robust undervoltage lockout (2.07V trip). Use Value: Maintains regulation during cold-cranking events where battery dips to 2.25V - ensuring continuous GPS lock without reset. |
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 1.2MHz frequency; no programmable phase or Burst Mode®; higher quiescent current (250µA) | Targeted at industrial motor drives with integrated LDOs - lacks fine-grained light-load optimization for battery-powered devices | Select only if fixed-frequency simplicity and integrated LDOs outweigh need for ultra-low IQ and phase control. |
| ISL9123IRAJZ-T7A | Single 3A output (not dual); supports 2.5V–5.5V input; 12µA IQ in DTS mode - no dual-channel capability | Designed for single-rail mobile SoCs requiring dynamic voltage scaling - cannot replace dual independent outputs | Not a functional substitute; consider only for redesigns consolidating into single high-current rail with different topology. |
Compared with TPS65270RGET and ISL9123IRAJZ-T7A, the LTC3417AEFE#TRPBF uniquely delivers independently controllable 1.5A/1A outputs with selectable phase alignment, sub-130µA sleep current, and 0.6–4MHz programmability - making it optimal for space- and battery-constrained dual-rail embedded systems where efficiency, noise, and thermal performance are co-optimized.
Availability
LTC3417AEFE#TRPBF is available at Aetrix Electronics and suitable for portable digital cameras, wireless modems, and GPS navigation modules requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3417AEFE#TRPBF 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 instrumentation, communications, and industrial markets.
The LTC3417A product line was designed specifically for medium-power, dual-output point-of-load DC/DC conversion in battery-operated and space-constrained embedded systems - emphasizing efficiency across load range, thermal manageability in small packages, and flexible sequencing control.
FAQ
What is the maximum supported switching frequency for the LTC3417AEFE#TRPBF?
The LTC3417AEFE#TRPBF supports a maximum switching frequency of 4MHz when configured with an external resistor on the FREQ pin. At this frequency, inductors and capacitors can be minimized for ultra-compact layouts, though efficiency decreases slightly compared to 1.5MHz operation. The device guarantees stable operation up to 4MHz across its full –40°C to +85°C temperature range, with frequency variation limited to ±10% over temperature and input voltage.
How does the PHASE pin affect input capacitor sizing in the LTC3417AEFE#TRPBF?
The PHASE pin on the LTC3417AEFE#TRPBF selects whether the two output channels operate in-phase or 180° out-of-phase. When set to 180° out-of-phase, input RMS current is reduced by up to 29% compared to in-phase operation - directly allowing use of smaller input capacitors with lower RMS current ratings. This is especially valuable in height-constrained designs where 2mm-height ceramic or polymer capacitors are preferred.
Can the LTC3417AEFE#TRPBF regulate both outputs simultaneously at different voltages?
Yes, the LTC3417AEFE#TRPBF regulates both outputs independently at different voltages. Each channel has its own feedback pin (VFB1 and VFB2), each referenced to a precise 0.8V internal bandgap. By selecting unique resistor dividers on each feedback node, VOUT1 can be set from 0.8V to 5V (e.g., 1.8V), while VOUT2 is set to a different value (e.g., 2.5V) - all while maintaining tight regulation, fast transient response, and independent RUN pin control.
What is the minimum input voltage required for the LTC3417AEFE#TRPBF to maintain regulation?
The LTC3417AEFE#TRPBF maintains regulation down to an input voltage of 2.25V, as specified in its absolute maximum and operating conditions. Its undervoltage lockout (UVLO) releases at 2.07V (typical), but guaranteed regulation begins at 2.25V. Below this, dropout behavior occurs: the P-channel MOSFETs enter 100% duty cycle, and output voltage tracks input minus RDS(ON) × ILOAD losses - still functional but no longer regulated.
Does the LTC3417AEFE#TRPBF require external compensation components?
No, the LTC3417AEFE#TRPBF uses internal compensation and requires no external components on the ITH pins for basic operation. The ITH1 and ITH2 pins provide access to the error amplifier output for optional external compensation - useful when optimizing transient response for specific output capacitor ESR or load profiles - but default stability is achieved with no external parts connected to these pins.
LTC3417AEFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3417AEFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3417AEFE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3417AEFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3417AEFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3417AEFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3417AEFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3417AEFE#TRPBF?
LTC3417AEFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3417AEFE#TRPBF 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#TRPBF?
For technical support, including LTC3417AEFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3417AEFE#TRPBF requirements.
6.How does Aetrix verify that LTC3417AEFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3417AEFE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3417AEFE#TRPBF?
All LTC3417AEFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3417AEFE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3417AEFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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