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Analog Devices Inc. LTC3413EFE#PBF
- Part No.:
- LTC3413EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3413EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,143
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Product details
Overview
LTC3413EFE#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 at VOUT = VREF/2 = 1.25V, and integrates 85mΩ P-channel and 65mΩ N-channel MOSFETs in a 16-lead TSSOP with exposed pad. It is used in notebook computers and distributed power systems requiring precise bus termination.
For engineers reviewing the LTC3413EFE#PBF datasheet, LTC3413EFE#PBF pinout, LTC3413EFE#PBF application, or LTC3413EFE#PBF equivalent, key selection criteria include its forced-continuous mode operation, programmable 300kHz–2MHz switching frequency via RT resistor, ±1% output voltage accuracy, power-good monitoring, and thermal protection - all critical for high-density DDR memory interface power rails.
Technical Context
The LTC3413EFE#PBF employs a constant-frequency current-mode control architecture with internal slope compensation recovery to maintain stable operation above 50% duty cycle. Its dual-MOSFET synchronous topology eliminates external Schottky diodes and enables bidirectional current flow for active termination of SSTL/HSTL buses.
Control is implemented via an error amplifier comparing VFB against half of VREF, with ITH pin modulating peak inductor current. Overcurrent protection limits both sourcing and sinking current independently, while PGOOD asserts open-drain low if output deviates >±10% from regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports wide-core logic supply rails including 2.5V, 3.3V, and 5V systems. |
| Output Current | ±3A continuous - enables active termination of DDR2/DDR3/SSTL-2/SSTL-18 buses without external current amplification. |
| Switching Frequency | Programmable 300kHz–2MHz via RT resistor - allows trade-off between inductor size (high-freq) and efficiency (low-freq). |
| Output Voltage Accuracy | ±1% over temperature - ensures tight regulation required for memory interface voltage reference compliance. |
| RDS(ON) (P-FET) | 85mΩ typical - minimizes conduction loss during sourcing, critical for high-current termination paths. |
| RDS(ON) (N-FET) | 65mΩ typical - enables efficient sink operation during memory bus discharge phases. |
| Power Good Threshold | ±10% output window - provides reliable system-level fault detection for memory controller sequencing. |
| Junction Temp Limit | 125°C with thermal shutdown - protects device during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed thermal pad (Pin 17), rated for –40°C to +85°C ambient operation. Exposed pad must be soldered to PGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (1) | Signal Input Supply | Provides clean bias for control circuitry; must be ≥ PVIN and within 0.5V of it to avoid instability. |
| PGOOD (2) | Open-Drain Status Output | Pulled low when VOUT is outside ±10% regulation - used for system power sequencing and fault reporting. |
| ITH (3) | Error Amplifier Compensation Node | Controls peak inductor current threshold; voltage range 0.2V–1.4V maps to zero-sense to full-scale current limit. |
| VFB (4) | Feedback Input | Monitors output voltage divider; internal 1:1 ratio sets VOUT = VREF/2 = 1.25V by default. |
| RT (5) | Oscillator Timing Input | Resistor-to-ground sets switching frequency; 309kΩ yields ~1MHz, enabling compact 0.47μH inductor selection. |
| VREF (6) | Reference Voltage Input | Internal 2.5V reference; output voltage tracks VREF/2 unless externally programmed via resistor divider. |
| RUN/SS (7) | Enable & Soft-Start Control | Below 0.5V disables device (<1μA IQ); capacitor to ground sets soft-start ramp time for controlled current ramp-up. |
| SGND (8) | Signal Ground Reference | Return for small-signal components; must connect to PGND at single point to prevent noise coupling into control loop. |
| PVIN (9,16) | Power Input Supply | High-current VIN path; requires local low-ESR decoupling to PGND to minimize switching noise on input rail. |
| SW (10,11,14,15) | Switch Node | Connects to inductor; carries high di/dt square wave - layout must minimize loop area to reduce EMI. |
| PGND (12,13) | Power Ground Return | High-current return for PVIN, SW, and exposed pad; must be solid copper plane tied to CIN/COUT (–) terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical ±3A source/sink capability | Enables true active termination of bidirectional memory buses without external current mirrors or op-amps. |
| Integrated 85mΩ P-FET / 65mΩ N-FET | Eliminates need for external Schottky diode and reduces BOM count while improving efficiency at 3A load. |
| Forced-continuous conduction mode | Prevents subharmonic oscillation and reduces output ripple/noise - essential for noise-sensitive memory interfaces. |
| Adjustable compensation via ITH pin | Allows transient response optimization across wide range of output capacitors (e.g., ceramic vs. polymer) and load conditions. |
| Overtemperature and overcurrent protection | Independent fault detection for sourcing/sinking paths plus thermal shutdown prevents damage during short-circuit or thermal overload. |
| Power-good output with ±10% window | Provides deterministic system-level power sequencing signal compatible with DDR memory controller reset requirements. |
Applications
| DDR Memory Termination | QDR Memory Termination |
|---|---|
Use Scenario: Providing precise 1.25V termination voltage for DDR2/DDR3 SDRAM data/strobe lines in notebook and embedded systems. IC Role / Device Role / Timing Role: Active bus terminator delivering ±3A dynamic current to absorb/refill line capacitance during fast edge transitions. Use Value: Maintains signal integrity by eliminating reflections and reducing timing skew - enabled by ±1% output accuracy and <100ns transient response. | Use Scenario: Supplying matched 1.25V termination for QDR SRAM address/data buses operating at >200MHz clock rates. IC Role / Device Role / Timing Role: Bidirectional current sink/source regulator synchronized to QDR read/write cycles to stabilize bus voltage during simultaneous access. Use Value: Prevents bus collapse under heavy load via symmetrical ±3A capability and forced-continuous mode - critical for QDR's dual-edge data transfer. |
| SSTL-2 / HSTL Termination | Notebook Computer Power Rails |
Use Scenario: Generating compliant 1.4V (SSTL-2) or 1.5V (HSTL) termination voltages using external resistor divider on VFB pin. IC Role / Device Role / Timing Role: Programmable termination regulator supporting JEDEC-compliant logic families with adjustable feedback network. Use Value: Eliminates discrete resistor networks and improves voltage tracking accuracy - achieved via internal 2.5V VREF and ±1% VFB tolerance. | Use Scenario: Delivering tightly regulated 1.25V termination for high-speed chipset interconnects in space-constrained laptop motherboards. IC Role / Device Role / Timing Role: Compact, thermally efficient termination supply integrated into multi-rail PMIC subsystems. Use Value: Reduces solution footprint by 40% vs. discrete FET+controller designs - enabled by 16-lead TSSOP package with exposed thermal pad. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3412EFE#PBF | 2A output current rating; identical pinout and feature set except reduced current capability. | Suitable only for lower-current DDR interfaces (e.g., DDR1 or low-density DDR2 modules). | Select when system load does not exceed 2A and cost reduction is prioritized over headroom. |
| TPS543B20RHLR | 3A, 2MHz, but uses external MOSFETs; no integrated switches; requires separate gate drivers and loop compensation. | Used in industrial systems where thermal derating or extended temperature operation (>85°C) is required. | Choose when higher reliability under thermal stress or custom FET selection (e.g., ultra-low RDS(ON)) is needed. |
Compared with LTC3412EFE#PBF, the LTC3413EFE#PBF provides 50% higher current headroom for DDR3 termination under worst-case VIN/VOUT ratios; versus TPS543B20RHLR, it offers 40% smaller solution size and eliminates gate-drive design complexity at the cost of fixed internal FET selection.
Availability
LTC3413EFE#PBF is available at Aetrix Electronics and suitable for DDR memory termination, QDR interface power, and SSTL/HSTL bus regulation requiring stable component supply across high-volume notebook, telecom infrastructure, and industrial embedded programs.
Supply support for LTC3413EFE#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 its precision analog and power management product lines. The company specializes in high-performance signal conditioning and power conversion ICs for demanding applications.
The LTC3413EFE#PBF belongs to Linear's monolithic synchronous buck regulator family designed specifically for high-current, low-voltage bus termination in memory-intensive systems - emphasizing symmetrical current handling, tight DC accuracy, and robust transient response.
FAQ
What is the maximum supported switching frequency for the LTC3413EFE#PBF?
The LTC3413EFE#PBF supports up to 2MHz switching frequency, set by an external resistor on the RT pin. While 2MHz operation is guaranteed by design, production testing confirms 1.12MHz typical at ROSC = 309kΩ. Frequencies above 1.5MHz require careful attention to PCB layout and gate drive losses to maintain efficiency.
Does the LTC3413EFE#PBF support pre-biased output startup?
No, the LTC3413EFE#PBF does not support pre-biased output startup. If the VOUT pin is externally driven above 110% of regulation (e.g., >1.375V for 1.25V output) during startup, the device may latch into a non-switching state. Proper sequencing requires asserting RUN/SS only after external bias sources are disabled or isolated.
How is output voltage programmed on the LTC3413EFE#PBF?
The LTC3413EFE#PBF defaults to VOUT = VREF/2 = 1.25V when VFB is connected directly to VOUT. To program other voltages, an external resistor divider (R1 from VOUT to VFB, R2 from VFB to SGND) sets VOUT = (VREF/2) × (1 + R1/R2). This method preserves ±1% accuracy if R1/R2 ratio tolerances are ≤0.5%.
What thermal considerations apply to the LTC3413EFE#PBF in dropout operation?
In dropout (VIN ≈ VOUT), the LTC3413EFE#PBF operates at near-100% duty cycle, increasing conduction loss through the P-channel MOSFET. At 3A load and 70°C ambient, junction temperature reaches ~103°C with θJA = 38°C/W - well below the 125°C limit. However, thermal performance degrades rapidly if the exposed pad is not soldered to a minimum 100mm² PGND copper area.
Can the LTC3413EFE#PBF be used for non-memory applications like general-purpose point-of-load regulation?
Yes, the LTC3413EFE#PBF can serve as a general-purpose 3A synchronous buck regulator, but its feature set is optimized for termination: forced-continuous mode minimizes noise, symmetrical current handling is unnecessary for standard loads, and the VREF/2 default output targets memory standards. For generic PoL use, consider parts with adjustable soft-start, wider VOUT range, or light-load efficiency modes.
LTC3413EFE#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
LTC3413EFE#PBF FAQ
1.How can I place an order for LTC3413EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3413EFE#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 LTC3413EFE#PBF reliable?
The price and inventory of LTC3413EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3413EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3413EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3413EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3413EFE#PBF?
LTC3413EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3413EFE#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 LTC3413EFE#PBF?
For technical support, including LTC3413EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3413EFE#PBF requirements.
6.How does Aetrix verify that LTC3413EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3413EFE#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 LTC3413EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3413EFE#PBF?
All LTC3413EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3413EFE#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 LTC3413EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3413EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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