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Analog Devices Inc. LTC3612EFE#TRPBF
- Part No.:
- LTC3612EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3612EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,150
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Product details
Overview
LTC3612EFE#TRPBF from Analog Devices (formerly Linear Technology) is a 3A, 4MHz monolithic synchronous step-down DC/DC converter in a thermally enhanced 20-pin TSSOP package. It operates from 2.25V to 5.5V input, delivers output down to 0.6V with ±1% accuracy, supports 100% duty cycle for low-dropout operation, and features selectable Burst Mode®, pulse-skipping, or forced continuous mode - ideal for portable computing and DDR memory termination.
For engineers reviewing the LTC3612EFE#TRPBF datasheet, LTC3612EFE#TRPBF pinout, LTC3612EFE#TRPBF application, or LTC3612EFE#TRPBF equivalent, key selection criteria include its 70µA no-load quiescent current in Burst Mode®, programmable switching frequency up to 4MHz, internal AVP support via ITH pin, DDR mode capability, and thermal performance in the FE-package variant.
Technical Context
The LTC3612EFE#TRPBF employs a constant-frequency, current-mode control architecture with an internal 2.25MHz oscillator (extendable to 4MHz via RT/SYNC resistor or external clock). Its dual-MOSFET synchronous rectification eliminates external catch diodes, while adjustable compensation on the ITH pin enables transient optimization across load and capacitor variations.
It integrates four operating modes via the MODE pin: Burst Mode® (internal or external clamp), pulse-skipping, and forced continuous - each altering switching behavior, ripple, and light-load efficiency. The device supports tracking, soft-start, and DDR-specific functionality (e.g., ±1.5A sinking capability when DDR = SVIN), with PGOOD monitoring based on ±7.5% VFB window detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous sourcing; ±1.5A sinking in DDR mode - enables bidirectional regulation for DDR memory termination. |
| Input Voltage Range | 2.25V to 5.5V - supports single Li-Ion battery and fixed low-voltage rails without external LDO pre-regulation. |
| Quiescent Current | 70µA in Burst Mode® at no load - extends battery runtime in always-on portable systems. |
| Output Accuracy | ±1% over temperature - ensures stable core voltage for microprocessors and FPGAs. |
| Switching Frequency | Up to 4MHz (externally programmable) - allows use of sub-1µH inductors and compact PCB layout. |
| Duty Cycle | 100% - maintains regulation during deep battery discharge, critical for handheld devices. |
| Shutdown Current | ≤1µA - minimizes system standby power loss in battery-backed applications. |
Pinout & Package
The LTC3612EFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE) with exposed pad (Pin 21) connected to PGND for thermal management. θJA = 38°C/W enables reliable 3A operation with moderate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1) | Signal Input Supply | Powers internal control circuitry and feeds UVLO comparator - must be ≥2.25V for startup. |
| RUN (Pin 2) | Enable Control | Active-high logic input; pulled low to enter shutdown (<1µA IQ) - used for system-level power sequencing. |
| PGOOD (Pin 3) | Power Good Monitor | Open-drain output asserting high only when VFB is within ±7.5% of setpoint for >105µs - signals downstream logic readiness. |
| MODE (Pin 4) | Operating Mode Selector | Voltage-controlled interface: 0V = Burst Mode®, SVIN = pulse-skipping, 1.1–0.58×SVIN = forced continuous - determines ripple/noise vs. efficiency trade-off. |
| VFB (Pin 5) | Feedback Input | High-impedance node sensing resistive divider output - sets regulated VOUT = 0.6V × (1 + R1/R2). |
| ITH (Pin 6) | Error Amplifier Compensation | Current-sense threshold control; tied to SVIN enables internal AVP and simplifies loop compensation. |
| TRACK/SS (Pin 7) | Soft-Start / Tracking Input | Programmable start-up ramp or external reference input - enables supply tracking and controlled inrush limiting. |
| DDR (Pin 8) | DDR Mode Enable | Tied to SVIN to activate ±1.5A sinking capability and shift PGOOD window - required for DDR2/DDR3 VTT termination. |
| RT/SYNC (Pin 9) | Oscillator Control | Configurable as frequency-setting resistor node, external sync input (0.3–4MHz), or internal 2.25MHz enable - provides EMI control flexibility. |
| SGND (Pin 10) | Signal Ground Reference | Reference for all analog circuitry; must connect to PGND at single point to avoid noise coupling into feedback path. |
| PVIN_DRV (Pin 20) | Gate Driver Supply | Must be tied to PVIN - powers internal high-side gate driver and ensures proper MOSFET turn-on under low VIN conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Power Switches | Eliminates external Schottky diode, reduces BOM count by 1 component, and improves efficiency by ~5% at 1A load. |
| Adjustable Burst Clamp via MODE Pin | Enables precise control of light-load efficiency vs. output ripple trade-off - external clamp voltage directly sets minimum ITH threshold. |
| DDR Memory Termination Support | Provides ±1.5A bidirectional current capability and dynamic PGOOD window shifting - meets JEDEC-compliant VTT rail requirements. |
| 100% Duty Cycle Operation | Maintains regulation down to VIN – VOUT ≈ 0.15V at 3A - extends usable battery range in Li-Ion-powered systems by ~15 minutes. |
| Programmable Soft-Start via TRACK/SS | Capacitor-based timing allows adjustable ramp rate (e.g., 1ms to 10ms) - prevents inrush current damage to input capacitors and upstream regulators. |
Applications
| Point-of-Load Regulation | Portable Computing Power |
|---|---|
Use Scenario: Regulating 1.2V/3A for FPGA core voltage in a compact industrial controller with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC power directly at the load. Use Value: 95% peak efficiency and 70µA quiescent current extend runtime and reduce heatsink requirements in fanless enclosures. | Use Scenario: Powering CPU I/O and memory interfaces in a 12mm-thick ultrabook using single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Main system PMIC buck stage supporting dynamic voltage scaling and fast load transient response. Use Value: 4MHz switching enables <1µH inductors and <100µF total output capacitance, saving >12mm² board area. |
| DDR Memory Termination | Handheld Device Power Management |
Use Scenario: Generating JEDEC-compliant VTT rail (±1.5A, 0.9V) for DDR3L memory in a medical tablet. IC Role / Device Role / Timing Role: Bidirectional synchronous buck acting as active termination supply with sink/source capability. Use Value: DDR pin activation enables accurate ±7.5% PGOOD window tracking and eliminates need for external op-amp current mirrors. | Use Scenario: Supplying 1.8V/2A to application processor and display driver in a ruggedized handheld scanner. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC/DC converter enabling multi-day battery life in intermittent-use devices. Use Value: Burst Mode® operation achieves <10µW no-load power dissipation, reducing average battery drain by 30% versus pulse-skipping alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3A, 28V max input, fixed 570kHz fSW, no DDR mode or external burst clamp - lower integration, higher IQ (120µA) | Targeted at industrial 12V/24V input systems, not optimized for Li-Ion or DDR termination | Select if input exceeds 5.5V or cost sensitivity outweighs feature set; verify external compensation for transient stability. |
| MP2315GJ-Z | 3A, 5.5V max input, 1.5MHz fixed fSW, no MODE-selectable modes or DDR function - simpler control but less flexible | Suitable for basic point-of-load where Burst Mode® and tracking are unnecessary | Choose for simplified design with minimal external components; lacks AVP, soft-start programming, and PGOOD accuracy of LTC3612EFE#TRPBF. |
Compared with TPS54332DR and MP2315GJ-Z, the LTC3612EFE#TRPBF offers superior light-load efficiency via programmable Burst Mode®, integrated DDR termination capability, and finer control over compensation and soft-start - making it optimal for space-constrained, battery-sensitive, and memory-intensive applications.
Availability
LTC3612EFE#TRPBF is available at Aetrix Electronics and suitable for portable computing, DDR memory termination, and handheld device power management requiring stable component supply, long-lifecycle availability, and guaranteed -40°C to +125°C operation.
Supply support for LTC3612EFE#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3612EFE#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for low-voltage, high-current point-of-load applications in battery-powered and space-constrained systems.
FAQ
What is the maximum switching frequency supported by the LTC3612EFE#TRPBF?
The LTC3612EFE#TRPBF supports a maximum switching frequency of 4MHz, achievable either by applying an external clock signal to the RT/SYNC pin or by selecting an appropriate resistor value (e.g., ~100kΩ to ground). At 4MHz, the device enables use of sub-1µH inductors and significantly reduces output capacitor requirements, which is critical for ultra-compact designs. The internal oscillator defaults to 2.25MHz when RT/SYNC is tied to SVIN.
Does the LTC3612EFE#TRPBF support DDR memory termination, and how is it configured?
Yes, the LTC3612EFE#TRPBF supports DDR memory termination via its dedicated DDR pin (Pin 8). When DDR is tied to SVIN, the device enters DDR mode, enabling ±1.5A bidirectional current capability and shifting the PGOOD window to track the TRACK/SS voltage. This configuration satisfies JEDEC-compliant VTT rail requirements without external current-sense amplifiers or discrete MOSFETs, and is validated for DDR2/DDR3 applications per the datasheet.
What is the purpose of the ITH pin on the LTC3612EFE#TRPBF, and how does it affect loop stability?
The ITH pin on the LTC3612EFE#TRPBF serves as the error amplifier output and current-sense threshold control node. Its voltage directly sets the peak inductor current. Connecting ITH to SVIN enables internal compensation and Active Voltage Positioning (AVP), simplifying design for standard loads. For custom transient response, external RC networks on ITH allow full loop compensation tuning - essential when using low-ESR ceramic capacitors or wide output capacitance ranges, as specified in the Applications Information section.
How does the MODE pin selection impact efficiency and output ripple in the LTC3612EFE#TRPBF?
The MODE pin on the LTC3612EFE#TRPBF selects among four operating modes: Burst Mode® (0V), pulse-skipping (SVIN), forced continuous (1.1–0.58×SVIN), or external-clamp Burst Mode® (0.45–0.8V). Burst Mode® delivers lowest IQ (70µA) but introduces low-frequency ripple; forced continuous eliminates ripple but increases light-load losses; pulse-skipping balances both. Selection directly determines system-level trade-offs between battery life, EMI, and signal integrity - confirmed by efficiency vs. load graphs in Figures G01–G03.
What thermal considerations apply to the LTC3612EFE#TRPBF in its TSSOP (FE) package?
The LTC3612EFE#TRPBF in the 20-lead TSSOP (FE) package has θJA = 38°C/W. To maintain TJ ≤ 125°C at 3A output, ambient temperature must remain ≤ 85°C with ≥2 in² of 2-oz copper connected to the exposed PGND pad (Pin 21). Thermal performance degrades rapidly without proper pad soldering - the datasheet mandates exposed-pad connection to PCB ground. Derating curves in Figure G22 show RDS(ON) increases with temperature, affecting dropout and efficiency at elevated junction temperatures.
LTC3612EFE#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:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3612EFE#TRPBF FAQ
1.How can I place an order for LTC3612EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612EFE#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 LTC3612EFE#TRPBF reliable?
The price and inventory of LTC3612EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612EFE#TRPBF?
LTC3612EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612EFE#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 LTC3612EFE#TRPBF?
For technical support, including LTC3612EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3612EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612EFE#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 LTC3612EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612EFE#TRPBF?
All LTC3612EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612EFE#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 LTC3612EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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