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Analog Devices Inc. LTC3612IFE#TRPBF
- Part No.:
- LTC3612IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3612IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,327
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Product details
Overview
LTC3612IFE#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 delivers ±1% output voltage accuracy down to 0.6V, supports 2.25V–5.5V input, enables 100% duty cycle for low-dropout operation, and features selectable Burst Mode® (70µA IQ), pulse-skipping, or forced continuous mode - ideal for DDR memory termination and portable Li-Ion systems.
For engineers reviewing the LTC3612IFE#TRPBF datasheet, LTC3612IFE#TRPBF pinout, LTC3612IFE#TRPBF application, or LTC3612IFE#TRPBF equivalent, key selection criteria include its 20-pin TSSOP thermal performance (θJA = 38°C/W), programmable switching frequency up to 4MHz, internal AVP support via ITH pin, DDR mode capability, and precise 0.6V feedback reference with ±1% accuracy over temperature.
Technical Context
The LTC3612IFE#TRPBF implements a current-mode, constant-frequency architecture with dual internal MOSFETs (70mΩ P-channel high-side, 45mΩ N-channel synchronous rectifier). Its error amplifier drives the ITH pin to regulate peak inductor current, while MODE pin selection determines operating mode - Burst Mode® (SGND), pulse-skipping (SVIN), or forced continuous (1.1V–0.58×SVIN).
It supports external synchronization up to 4MHz via RT/SYNC, offers adjustable soft-start via TRACK/SS, and integrates power-good monitoring with 70–140µs blanking time. The DDR pin enables dual-reference operation: tied to SGND for 0.6V internal reference or to SVIN for external tracking with TRACK/SS as reference input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports point-of-load regulation for microprocessors and DDR memory rails. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-Ion (2.7–4.2V) and fixed 3.3V/5V supplies. |
| Feedback Accuracy | ±1% over –40°C to 125°C - ensures stable output under thermal stress without calibration. |
| Quiescent Current | 70µA in Burst Mode® - extends battery life in always-on portable devices at light load. |
| Switching Frequency | Up to 4MHz (externally programmable) - enables use of sub-1µH inductors for compact PCB layout. |
| Duty Cycle | 100% - maintains regulation during brownout or deep discharge (e.g., Li-Ion < 3.0V). |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level sleep requirements. |
Pinout & Package
The LTC3612IFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE) with exposed pad (Pin 21) soldered to PGND for thermal management (θJA = 38°C/W). Pin numbering follows standard JEDEC TSSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1) | Signal Input Supply | Powers control circuitry and feeds UVLO comparator; must be ≥2.25V for operation. |
| RUN (Pin 2) | Enable Input | Active-high logic: <0.4V disables regulator, drawing ≤1µA; >1V enables switching. |
| PGOOD (Pin 3) | Open-Drain Status Output | Pulled low if VFB deviates >±7.5% from setpoint or during startup; 70–140µs blanking prevents false trips. |
| MODE (Pin 4) | Operating Mode Select | SGND = Burst Mode®, SVIN = pulse-skipping, 1.1V–0.58×SVIN = forced continuous, 0.45–0.8V = external-clamp Burst Mode®. |
| VFB (Pin 5) | Feedback Input | Compares resistive divider output against 0.6V internal reference; ±30nA bias current minimizes divider error. |
| ITH (Pin 6) | Error Amplifier Output | Controls peak inductor current threshold; tie to SVIN to enable internal compensation and AVP. |
| TRACK/SS (Pin 7) | Soft-Start / Tracking / Reference | Internal soft-start (tSS = 0.65–1.5ms), external tracking, or external reference input when DDR = SVIN. |
| DDR (Pin 8) | DDR Mode Enable | Tie to SGND for 0.6V reference; tie to SVIN to enable TRACK/SS as external reference and activate DDR-specific behavior. |
| RT/SYNC (Pin 9) | Frequency Control | Resistor-to-GND sets fSW (300kHz–4MHz); external clock sync up to 4MHz; tie to SVIN for 2.25MHz internal oscillator. |
| SGND (Pin 10) | Signal Ground | Reference for all small-signal pins (VFB, ITH, TRACK/SS); must connect to PGND at single point near CIN/COUT. |
| PVIN_DRV (Pin 20) | Gate Driver Supply | Must be connected directly to PVIN; powers internal gate drivers for optimal RDS(ON) and switching speed. |
| PGND (Pin 21) | Power Ground | Exposed pad; connects to source of N-channel switch and must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | Eliminates external catch diode, reduces conduction loss, and improves efficiency up to 95% at 3A. |
| Programmable Operating Modes | Selects optimal trade-off: Burst Mode® (70µA IQ), pulse-skipping (lower ripple), or forced continuous (EMI-controlled, bidirectional current). |
| DDR Memory Termination Support | Enables ±1.5A sink/source capability and dynamic reference tracking for DDR2/DDR3 VTT rails. |
| Adjustable Compensation via ITH | Allows transient response optimization across wide output capacitor types (ceramic, polymer) and load ranges (1mA–3A). |
| 100% Duty Cycle Low-Dropout Operation | Maintains regulation when VIN approaches VOUT - critical for battery-powered systems nearing end-of-discharge. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Regulating core voltage for FPGA or ASIC in space-constrained embedded systems. IC Role / Device Role / Timing Role: Primary buck converter delivering stable 1.2V/1.8V/2.5V at up to 3A with fast transient response. Use Value: High efficiency (>92% at 1A) and 4MHz switching reduce inductor size by >50% vs. 500kHz solutions, saving board area. | Use Scenario: Providing bidirectional ±1.5A termination for DDR2/DDR3 memory VTT rail. IC Role / Device Role / Timing Role: Sinking and sourcing current dynamically to maintain VTT = VDDQ/2 with tight regulation. Use Value: DDR pin + TRACK/SS enable precise tracking to VDDQ; forced continuous mode ensures zero-current dead time for clean VTT transitions. |
| Portable Li-Ion Systems | Industrial Distributed Power |
Use Scenario: Powering display backlight, camera module, and RF transceiver in handheld medical or IoT devices. IC Role / Device Role / Timing Role: Main system PMIC buck stage with ultra-low IQ sleep mode and 100% duty cycle for extended runtime. Use Value: 70µA quiescent current in Burst Mode® extends battery life during standby; 2.25V min VIN supports full Li-Ion discharge range. | Use Scenario: Local regulation from 5V/12V backplane in programmable logic controllers or sensor nodes. IC Role / Device Role / Timing Role: Isolated point-of-load converter with robust thermal performance (TSSOP θJA = 38°C/W). Use Value: Exposed PGND pad and low RDS(ON) switches minimize self-heating; –40°C to 125°C rating ensures reliability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3A, 28V max VIN, fixed 570kHz fSW, no Burst Mode®, higher IQ (270µA) | Lacks low-IQ sleep mode and DDR tracking; suited for higher-VIN industrial inputs only | Choose for 12V/24V input systems where efficiency at medium load matters more than standby IQ |
| MP2315GJ-Z | 3A, 6V max VIN, 2MHz fSW, 30µA IQ in skip mode, no DDR mode or AVP | No TRACK/SS or DDR functionality; limited to basic buck conversion without tracking or bidirectional current | Prefer for cost-sensitive consumer designs needing minimal footprint and moderate light-load efficiency |
Compared with TPS54332DR and MP2315GJ-Z, the LTC3612IFE#TRPBF uniquely combines ultra-low 70µA Burst Mode® IQ, DDR termination capability, 100% duty cycle, and programmable 300kHz–4MHz switching - making it optimal for battery-powered, memory-intensive, or thermally constrained applications requiring precision regulation.
Availability
LTC3612IFE#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and industrial distributed power supplies requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC3612IFE#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 and power management portfolio with rigorous automotive-grade qualification and long-term product longevity commitments.
The LTC3612IFE#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, and thermally demanding point-of-load applications in portable, computing, and industrial systems.
FAQ
What is the maximum switching frequency supported by the LTC3612IFE#TRPBF?
The LTC3612IFE#TRPBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin. This can be set using a resistor to ground, an external clock signal, or by tying RT/SYNC to SVIN for the default 2.25MHz internal oscillator. Operation at 4MHz enables use of very small inductors (e.g., 0.33µH) and ceramic capacitors, reducing solution size significantly.
Does the LTC3612IFE#TRPBF support DDR memory termination with bidirectional current capability?
Yes, the LTC3612IFE#TRPBF supports DDR memory termination with ±1.5A sink/source capability. When the DDR pin is tied to SVIN, the device enters DDR mode, enabling TRACK/SS to function as an external reference input and allowing precise tracking of VDDQ/2. Forced continuous mode must be selected (via MODE pin) to ensure uninterrupted current flow in both directions.
What is the quiescent current of the LTC3612IFE#TRPBF in Burst Mode® operation?
The LTC3612IFE#TRPBF draws only 70µA of quiescent current in Burst Mode® operation at no load while maintaining regulated output voltage. This value is specified over temperature and represents the lowest achievable IQ for this device, making it highly suitable for battery-powered applications requiring extended standby time.
How does the LTC3612IFE#TRPBF achieve 100% duty cycle operation, and why is it important?
The LTC3612IFE#TRPBF achieves 100% duty cycle by holding the high-side P-channel MOSFET continuously on when input voltage approaches the output voltage. This low-dropout behavior extends operational time in battery-powered systems - for example, sustaining 1.8V output down to a Li-Ion cell voltage of ~2.0V - without requiring a separate LDO post-regulator.
What package type and thermal characteristics does the LTC3612IFE#TRPBF use?
The LTC3612IFE#TRPBF uses a 20-lead plastic TSSOP package (FE) with an exposed thermal pad (Pin 21 = PGND). Its thermal resistance is θJA = 38°C/W under standard JEDEC 2S2P test conditions. The exposed pad must be soldered to a PCB ground plane to achieve rated thermal performance and reliability across the full –40°C to 125°C junction temperature range.
LTC3612IFE#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
LTC3612IFE#TRPBF FAQ
1.How can I place an order for LTC3612IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612IFE#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 LTC3612IFE#TRPBF reliable?
The price and inventory of LTC3612IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612IFE#TRPBF?
LTC3612IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612IFE#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 LTC3612IFE#TRPBF?
For technical support, including LTC3612IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3612IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612IFE#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 LTC3612IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612IFE#TRPBF?
All LTC3612IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612IFE#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 LTC3612IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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