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Analog Devices Inc. LTC3413EFE#TRPBF
- Part No.:
- LTC3413EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3413EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
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Product details
Overview
LTC3413EFE#TRPBF 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 package with exposed pad.
For engineers reviewing the LTC3413EFE#TRPBF datasheet, LTC3413EFE#TRPBF pinout, LTC3413EFE#TRPBF application, or LTC3413EFE#TRPBF equivalent, key selection criteria include symmetrical 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 overcurrent/overtemperature protection.
Technical Context
The LTC3413EFE#TRPBF employs a constant-frequency current-mode control architecture with dual internal power switches - an 85mΩ P-channel high-side MOSFET and a 65mΩ N-channel low-side MOSFET - enabling bidirectional output current up to ±3A. Its ITH pin provides direct control of peak inductor current, while slope compensation recovery ensures stable operation at duty cycles >40% without reducing maximum inductor peak current.
It features independent SVIN and PVIN supplies (ΔV ≤ 0.5V), a dedicated SGND for signal integrity, and a PGOOD open-drain output asserting low when VOUT deviates by >±10%. The device supports pre-biased load startup only when RUN/SS is sequenced before external circuitry drives VOUT, and includes short-circuit protection that skips switching cycles if valley inductor current exceeds 5A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V rails without external regulators. |
| Output Voltage | VREF/2 = 1.25V (±1%) - fixed by internal 2:1 resistor divider; eliminates external feedback resistors for DDR termination. |
| Output Current | ±3A continuous - enables active termination of DDR/QDR buses with symmetrical sourcing and sinking. |
| Switching Frequency | 300kHz to 2MHz (programmable via RT resistor) - allows tradeoff between small LC size (high-f) and efficiency (low-f). |
| RDS(ON) (P-FET) | 85mΩ (typ.) - reduces conduction loss during high-duty-cycle operation, e.g., dropout at VIN ≈ 2.5V. |
| RDS(ON) (N-FET) | 65mΩ (typ.) - minimizes reverse conduction loss during sink phase, critical for bus termination stability. |
| Efficiency | Up to 90% at 1A, VIN = 2.5V - achieved via synchronous rectification and low RDS(ON), reducing thermal stress in compact layouts. |
| PGOOD Threshold | ±10% output regulation window - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (Pin 17), rated for –40°C to +85°C ambient operation. 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 difference - decouple to SGND. |
| PGOOD (2) | Power Good Monitor | Open-drain output pulled low if VOUT is outside ±10%; used for system enable/disable sequencing. |
| ITH (3) | Error Amplifier Compensation | Controls peak inductor current threshold (0.2V–1.4V range); external RC sets loop dynamics. |
| VFB (4) | Feedback Input | Monitors output voltage; internally referenced to VREF/2 - no external resistors needed for standard 1.25V operation. |
| RT (5) | Oscillator Timing Input | Resistor-to-ground sets switching frequency (300kHz–2MHz); 309kΩ yields ~1MHz per datasheet. |
| VREF (6) | Reference Voltage Input | Internal 2.5V reference; VOUT = VREF/2 when VFB tied directly to VOUT. |
| RUN/SS (7) | Enable & Soft-Start Control | Pull <0.5V to shut down (<1μA IQ); capacitor to ground controls soft-start ramp time (1024 cycles to full current). |
| SGND (8) | Signal Ground | Reference for all small-signal pins (VFB, ITH, RT, etc.); connect to PGND at single point to avoid noise coupling. |
| PVIN (9,16) | Power Input Supply | High-current VIN path for power switches; decouple to PGND with low-ESR capacitors. |
| SW (10,11,14,15) | Switch Node | Connects to inductor; carries high di/dt square wave - requires tight layout and Kelvin connection to minimize ringing. |
| PGND (12,13) | Power Ground | Return path for high-current loops (PVIN → SW → inductor → COUT → PGND); tie exposed pad here. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical ±3A source/sink capability | Enables true active termination for DDR/QDR memory buses without external current mirrors or op-amps. |
| Integrated 2:1 feedback divider | Eliminates external resistors for 1.25V output, reducing BOM count and layout sensitivity to resistor tolerance/thermal drift. |
| Forced-continuous conduction mode | Suppresses subharmonic oscillation and EMI across full load range - critical for noise-sensitive memory subsystems. |
| Adjustable slope compensation recovery | Maintains constant maximum inductor peak current across duty cycles >40%, ensuring predictable transient response and stability. |
| Overcurrent protection on both source and sink paths | Detects and limits current during both sourcing and sinking phases - prevents damage during bus contention or short events. |
| Thermal shutdown with hysteresis | Disables both power switches at ~150°C junction temperature; resumes operation after cooldown - protects against sustained overload. |
Applications
| DDR Memory Termination | QDR Memory Termination |
|---|---|
Use Scenario: Active termination of DDR2/DDR3 address/control lines in notebook computers and server DIMMs. IC Role / Device Role / Timing Role: Provides regulated 1.25V VTT rail with instantaneous ±3A current delivery to absorb reflected signals and maintain signal integrity. Use Value: Eliminates need for discrete FETs and op-amps, reduces board area by >40%, and improves termination accuracy vs. passive solutions. | Use Scenario: Bidirectional termination of QDR SRAM data buses in networking ASIC interfaces and FPGA-based accelerators. IC Role / Device Role / Timing Role: Sinks and sources current dynamically to match fast edge rates and prevent overshoot/undershoot on double-data-rate buses. Use Value: Maintains <±1% VTT regulation under 0A→±3A load steps, enabling reliable 533+ MT/s operation without timing margin loss. |
| SSTL/HSTL Bus Termination | Distributed Power Systems |
Use Scenario: Termination of SSTL_18 or HSTL_I buses in high-speed logic interconnects (e.g., CPU-to-chipset links). IC Role / Device Role / Timing Role: Delivers precise VTT = VDDQ/2 with low output impedance (<10mΩ effective) to dampen transmission line reflections. Use Value: Achieves <50ps propagation delay from load step to response, meeting JEDEC SSTL timing budgets without added compensation. | Use Scenario: Compact, high-efficiency point-of-load regulator in space-constrained industrial controllers and telecom modules. IC Role / Device Role / Timing Role: Replaces multi-component buck + LDO solutions for 1.25V auxiliary rails requiring low-noise, bidirectional current. Use Value: Reduces solution footprint by 65% vs. discrete alternatives while maintaining 90% peak efficiency at 3A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51200DRCR | Lower max current (±3A sink, +2A source); 1.5MHz max fSW; no RT programming; requires external VREF. | Optimized for DDR3 VTT only; lacks symmetrical sourcing; limited to 0°C–70°C. | Choose for cost-sensitive DDR3 designs where ±2A sourcing suffices and extended temp not required. |
| ISL95812IRZ | Higher current (±6A); 1.2MHz fixed fSW; integrated MOSFETs with lower RDS(ON) (40mΩ/30mΩ); no RT pin. | Targeted at DDR4/LPDDR4; supports dynamic VTT tracking; wider input range (1.5V–5.5V). | Choose for DDR4 systems needing higher current headroom and dynamic voltage scaling support. |
Compared with TPS51200DRCR and ISL95812IRZ, the LTC3413EFE#TRPBF offers unique programmable frequency, symmetrical ±3A capability, and internal VREF/2 division - making it optimal for DDR2/DDR3 termination where layout simplicity and fixed 1.25V precision outweigh raw current headroom or DDR4 feature sets.
Availability
LTC3413EFE#TRPBF is available at Aetrix Electronics and suitable for DDR memory termination, QDR bus regulation, SSTL/HSTL interface power, and distributed point-of-load applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3413EFE#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 and maintains its high-performance analog/mixed-signal product lines. Linear's legacy DC/DC portfolio emphasizes precision, efficiency, and integration for demanding power applications.
The LTC3413EFE#TRPBF belongs to Linear's monolithic synchronous buck regulator family designed specifically for high-speed memory interface termination - prioritizing symmetrical current delivery, low-noise operation, and minimal external component count.
FAQ
What is the maximum supported switching frequency for the LTC3413EFE#TRPBF?
The LTC3413EFE#TRPBF supports a programmable switching frequency up to 2MHz, set by an external resistor on the RT pin. While 2MHz operation is guaranteed by design, production testing covers frequencies up to 1.12MHz per the Electrical Characteristics table. For robust 2MHz implementation, verify thermal performance and inductor saturation current at full load.
Does the LTC3413EFE#TRPBF require external feedback resistors to set VOUT = 1.25V?
No, the LTC3413EFE#TRPBF does not require external feedback resistors for VOUT = 1.25V operation. It integrates an internal 2:1 resistor divider that references VFB to VREF/2. When VFB is connected directly to VOUT, the output is precisely regulated to half the VREF voltage (2.5V/2 = 1.25V), eliminating resistor matching errors and thermal drift effects.
How does the LTC3413EFE#TRPBF handle pre-biased output conditions during startup?
The LTC3413EFE#TRPBF can latch into a non-switching state if VOUT is externally driven above 1.1×VREF/2 (i.e., >1.375V) before RUN/SS is enabled. To prevent this, the RUN/SS pin must be asserted *after* any external circuitry driving VOUT is powered down. Sequencing RUN/SS before VOUT bias ensures proper soft-start and avoids permanent disable until reset.
What is the purpose of separate SVIN and PVIN pins on the LTC3413EFE#TRPBF?
The LTC3413EFE#TRPBF uses separate SVIN (signal supply) and PVIN (power supply) pins to isolate noise-sensitive control circuitry from high-current switching paths. SVIN powers the error amplifier, oscillator, and logic; PVIN powers the internal MOSFETs. Keeping SVIN ≥ PVIN and ΔV ≤ 0.5V ensures stable regulation while minimizing coupling of switching transients into feedback and timing circuits.
Can the LTC3413EFE#TRPBF be used for applications other than memory termination?
Yes, the LTC3413EFE#TRPBF is applicable beyond DDR/QDR termination. Its ±3A symmetrical current, 2.25V–5.5V input range, and programmable frequency make it suitable for any bidirectional point-of-load requirement - including active biasing of RF amplifiers, programmable current sources/sinks in test equipment, and low-noise auxiliary supplies in mixed-signal systems where forced-continuous mode suppresses EMI.
LTC3413EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 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
LTC3413EFE#TRPBF FAQ
1.How can I place an order for LTC3413EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3413EFE#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 LTC3413EFE#TRPBF reliable?
The price and inventory of LTC3413EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3413EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3413EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3413EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3413EFE#TRPBF?
LTC3413EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3413EFE#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 LTC3413EFE#TRPBF?
For technical support, including LTC3413EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3413EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3413EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3413EFE#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 LTC3413EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3413EFE#TRPBF?
All LTC3413EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3413EFE#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 LTC3413EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3413EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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