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Analog Devices Inc. LTC3413IFE#PBF
- Part No.:
- LTC3413IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3413IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,714
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Product details
Overview
LTC3413IFE#PBF from Analog Devices (formerly Linear Technology) is a 3A, 2MHz monolithic synchronous step-down DC/DC converter optimized for DDR/QDR memory termination. It operates from 2.25V to 5.5V input, delivers ±3A symmetrical source/sink current, maintains VOUT = VREF/2 = 1.25V with ±1% accuracy, and integrates 85mΩ P-channel and 65mΩ N-channel MOSFETs in a 16-lead TSSOP with exposed pad.
For engineers reviewing the LTC3413IFE#PBF datasheet, LTC3413IFE#PBF pinout, LTC3413IFE#PBF application, or LTC3413IFE#PBF equivalent, key selection considerations include symmetrical bidirectional current capability, programmable 300kHz–2MHz switching frequency via RT resistor, forced-continuous mode operation for low noise, internal voltage divider eliminating external feedback resistors, and integrated overtemperature and overcurrent protection for bus termination reliability.
Technical Context
The LTC3413IFE#PBF implements a constant-frequency current-mode control architecture with dual internal MOSFETs - an 85mΩ P-channel high-side switch and 65mΩ N-channel low-side switch - enabling true bidirectional current flow for DDR/QDR VTT termination. Its error amplifier compares VFB against half of VREF (1.25V), while ITH pin voltage sets peak inductor current threshold during sourcing and sinking phases.
Switching frequency is set by an external resistor on RT pin (300kHz–2MHz range), with slope compensation active above 40% duty cycle to prevent subharmonic oscillation. The device supports pre-biased start-up avoidance via RUN/SS sequencing and includes open-drain PGOOD monitoring with ±10% output voltage window detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports wide-range logic supply rails including 2.5V, 3.3V, and 5V systems without external LDO pre-regulation. |
| Output Voltage | VOUT = VREF/2 = 1.25V ±1% - fixed split-reference output ideal for SSTL-18, HSTL, and DDR2/3 VTT termination without external resistive divider. |
| Output Current | ±3A continuous - enables full bidirectional termination current required for high-speed DDR/QDR memory interfaces under dynamic load conditions. |
| Switching Frequency | Programmable 300kHz–2MHz via RT resistor - allows trade-off between small passive size (high-freq) and efficiency (low-freq), with 2MHz operation validated by design. |
| Internal RDS(ON) | P-FET: 85mΩ / N-FET: 65mΩ at TA = 25°C - minimizes conduction loss and eliminates need for external Schottky diode in synchronous buck topology. |
| Protection Features | Overcurrent limit (3.8–5.4A), overtemperature shutdown, undervoltage lockout (1.75–2.25V), and ±10% PGOOD monitoring - ensures robust operation during transient faults and thermal stress. |
| Accuracy & Stability | ±1% VFB accuracy, adjustable compensation via ITH, and forced-continuous mode - guarantees tight regulation and low-noise performance critical for memory signal integrity. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed thermal pad (Pin 17), rated for –40°C to +85°C operating ambient temperature. Exposed pad must be soldered to PGND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (1) | Signal Input Supply | Provides clean bias for control circuitry; must be ≥ PVIN and within 0.5V differential to avoid malfunction. |
| PGOOD (2) | Power Good Monitor | Open-drain output pulled low when VOUT deviates >±10% - used for system power sequencing and fault reporting. |
| ITH (3) | Error Amplifier Compensation | Controls peak current limit threshold (0.2V–1.4V range); external RC network adjusts transient response for varied output capacitance. |
| VFB (4) | Feedback Input | Monitors output voltage; internally referenced to VREF/2 - no external resistors needed for standard 1.25V VTT applications. |
| RT (5) | Oscillator Timing Input | Connects to ground via resistor to set switching frequency (e.g., 309kΩ → 1MHz); enables precise EMI management. |
| VREF (6) | Reference Voltage Input | Accepts external reference or connects to VIN; determines VOUT scaling - enables tracking configurations if tied to noisy supply rails. |
| RUN/SS (7) | Enable & Soft-Start Control | Pull <0.5V to shut down (IQ <1μA); capacitor to ground sets soft-start ramp time - prevents inrush into pre-biased loads. |
| SGND (8) | Signal Ground Reference | Return for all small-signal components (RT, VFB, ITH); must connect to PGND at single point to avoid noise coupling. |
| PVIN (9,16) | Power Input Supply | High-current input path for main switches; requires local ceramic decoupling to PGND to suppress switching transients. |
| SW (10,11,14,15) | Switch Node | Connects to inductor; carries high di/dt square wave - layout must minimize loop area to reduce EMI and voltage overshoot. |
| PGND (12,13) | Power Ground Return | Return path for PVIN, SW, and output capacitors; large copper pour essential for thermal dissipation and low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical ±3A source/sink capability | Enables true bidirectional DDR/QDR VTT termination without external current mirrors or dual regulators. |
| Integrated 85mΩ P-FET / 65mΩ N-FET | Eliminates external Schottky diode and reduces BOM count while maintaining >90% peak efficiency at 3A. |
| Fixed VOUT = VREF/2 = 1.25V | Removes need for precision external feedback resistors - simplifies layout and improves long-term stability. |
| Forced-continuous conduction mode | Suppresses low-frequency ripple and RF interference critical for high-speed memory timing margins. |
| Adjustable compensation via ITH pin | Allows optimization of transient response across wide range of output capacitors (e.g., ceramic vs. polymer vs. tantalum). |
| Robust fault protection suite | Includes overcurrent, overtemperature, UVLO, and PGOOD monitoring - ensures reliable operation in mission-critical memory subsystems. |
Applications
| DDR Memory Termination | QDR Memory Termination |
|---|---|
Use Scenario: Provides stable VTT termination voltage for DDR2/DDR3 SDRAM modules operating at 1.8V or 1.5V I/O levels in notebook and server memory subsystems. IC Role / Device Role / Timing Role: Acts as bidirectional sink/source regulator delivering ±3A to maintain VTT at exactly half the VDDQ rail, ensuring signal integrity during read/write transitions. Use Value: Eliminates discrete FET-based termination networks, reduces board space by 40%, and improves termination accuracy to ±1% versus ±3% typical with resistor-based solutions. | Use Scenario: Supplies matched VTT for QDR SRAM in high-bandwidth networking equipment such as packet buffers and line cards requiring fast turnaround times. IC Role / Device Role / Timing Role: Regulates termination voltage with sub-100ns transient response to support QDR's double-data-rate interface and simultaneous read/write operations. Use Value: Maintains <50mV output deviation during ±3A load steps - critical for meeting QDR's strict setup/hold timing windows and minimizing bit error rates. |
| SSTL-18 Bus Termination | HSTL Class I Termination |
Use Scenario: Powers SSTL-18 compliant parallel buses in FPGA configuration interfaces, video processing pipelines, and industrial control backplanes. IC Role / Device Role / Timing Role: Delivers precise 0.9V VTT (via VREF = 1.8V) with low noise and zero external components - directly compatible with JEDEC SSTL-18 specification. Use Value: Achieves <10mV RMS output ripple at 2MHz switching - prevents jitter accumulation in clock distribution networks tied to same VTT rail. | Use Scenario: Supplies 1.5V VTT for HSTL Class I interfaces in high-speed ADC/DAC data acquisition systems and test instrumentation. IC Role / Device Role / Timing Role: Functions as low-noise, high-current termination source meeting HSTL's ±3% VTT tolerance and 100mA/ns slew rate requirements. Use Value: Supports 10+ HSTL drivers per rail with <20mV droop under full load - exceeds JEDEC HSTL Class I compliance margin by 2×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional termination regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51200DRCR | Lower max current (±3A vs ±3A), but uses external MOSFETs; no integrated P-FET/N-FET; requires external VREF and feedback resistors. | Designed for DDR3 VTT only; lacks QDR/SSTL/HSTL flexibility; no VREF/2 fixed output mode. | Select when board-level thermal management permits discrete FETs or when custom VOUT scaling beyond 1.25V is required. |
| ISL6264CRZ-T | Higher quiescent current (1.5mA vs 330μA), no PGOOD output, fixed 1MHz frequency; integrated MOSFETs but higher RDS(ON) (120mΩ/90mΩ). | Targeted at older DDR2 systems; lacks programmable frequency and forced-continuous mode - higher EMI risk in dense layouts. | Choose only for legacy DDR2 designs where cost sensitivity outweighs efficiency and noise requirements. |
Compared with TPS51200DRCR and ISL6264CRZ-T, the LTC3413IFE#PBF delivers superior integration (no external FETs or resistors), tighter output accuracy (±1% vs ±2%), lower EMI (forced-continuous mode), and broader application coverage across DDR/QDR/SSTL/HSTL standards - making it optimal for new high-speed memory interface designs.
Availability
LTC3413IFE#PBF is available at Aetrix Electronics and suitable for DDR memory termination, QDR SRAM interfaces, SSTL-18 bus systems, and HSTL Class I applications requiring stable component supply, guaranteed long-term availability, and full industrial temperature range (–40°C to +85°C) support.
Supply support for LTC3413IFE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and computing markets.
The LTC3413IFE#PBF belongs to ADI's Power Management product line, specifically engineered for high-efficiency, low-noise, bidirectional DC/DC conversion in memory interface and bus termination applications - emphasizing precision regulation, thermal robustness, and minimal external component count.
FAQ
What is the maximum supported switching frequency for the LTC3413IFE#PBF?
The LTC3413IFE#PBF supports programmable switching frequencies from 300kHz up to 2MHz using an external resistor on the RT pin. While 2MHz operation is guaranteed by design and characterized in typical performance curves, it is not production-tested at that frequency. For production-critical 2MHz applications, validation under actual thermal and load conditions is recommended. The LTC3413IFE#PBF achieves this range without external frequency-setting components beyond the RT resistor.
Does the LTC3413IFE#PBF require external feedback resistors to set VOUT?
No, the LTC3413IFE#PBF does not require external feedback resistors for its standard 1.25V output. It features an internal resistor divider that fixes VOUT = VREF/2, eliminating external components for DDR/QDR VTT applications. If a different output voltage is needed, an external resistor divider from VOUT to VFB can be added - but the LTC3413IFE#PBF's default configuration is resistor-free for 1.25V operation.
How does the LTC3413IFE#PBF handle bidirectional current flow during memory read/write cycles?
The LTC3413IFE#PBF uses internal P-channel and N-channel MOSFETs to actively source and sink up to ±3A, enabling true bidirectional current flow required for DDR/QDR VTT termination. During write cycles, it sinks current from the bus; during read cycles, it sources current to maintain VTT. The current-mode architecture and symmetrical overcurrent comparator ensure balanced response in both directions - a core capability distinguishing the LTC3413IFE#PBF from standard buck regulators.
What thermal considerations apply to the LTC3413IFE#PBF in high-current dropout operation?
In dropout (e.g., VIN = 3.3V, VOUT = 1.25V), the LTC3413IFE#PBF operates near 100% duty cycle, increasing conduction loss through the P-channel MOSFET. At 3A and 70°C ambient, junction temperature reaches ~103°C (θJA = 38°C/W). To stay below the 125°C limit, ensure the exposed pad is soldered to a minimum 1-inch² copper pour connected to PGND. The LTC3413IFE#PBF includes overtemperature protection that disables both switches if TJ exceeds ~150°C.
Can the LTC3413IFE#PBF be used with ceramic output capacitors, and what precautions apply?
Yes, the LTC3413IFE#PBF is fully compatible with ceramic output capacitors, which are recommended for low ESR and high ripple current handling. Use X5R or X7R dielectrics to minimize voltage coefficient effects. Avoid placing large ceramic capacitors directly at the input if long PCB traces exist between the wall adapter and PVIN - ringing induced by load steps may cause VIN spikes. The LTC3413IFE#PBF's stable loop design supports multi-capacitor parallel configurations without oscillation.
LTC3413IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.125V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3413IFE#PBF FAQ
1.How can I place an order for LTC3413IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3413IFE#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 LTC3413IFE#PBF reliable?
The price and inventory of LTC3413IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3413IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3413IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3413IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3413IFE#PBF?
LTC3413IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3413IFE#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 LTC3413IFE#PBF?
For technical support, including LTC3413IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3413IFE#PBF requirements.
6.How does Aetrix verify that LTC3413IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3413IFE#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 LTC3413IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3413IFE#PBF?
All LTC3413IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3413IFE#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 LTC3413IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3413IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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