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Analog Devices Inc. LTC3612HFE#TRPBF
- Part No.:
- LTC3612HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3612HFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
LTC3612HFE#TRPBF from Analog Devices (formerly Linear Technology) is a 3A, 4MHz monolithic synchronous step-down DC/DC converter with current-mode control, 2.25V–5.5V input range, ±1% output voltage accuracy, and 100% duty cycle capability for low-dropout operation in battery-powered systems. It supports Burst Mode® (70µA IQ), forced continuous mode, and external synchronization up to 4MHz.
For engineers reviewing the LTC3612HFE#TRPBF datasheet, LTC3612HFE#TRPBF pinout, LTC3612HFE#TRPBF application, or LTC3612HFE#TRPBF equivalent, key selection criteria include thermal performance at 150°C junction temperature, TSSOP-20 package compatibility with DDR memory termination and point-of-load supplies, and configurable MODE/RT/SYNC pins for noise-sensitive or high-efficiency designs.
Technical Context
The LTC3612HFE#TRPBF implements constant-frequency current-mode control with programmable oscillator (300kHz–4MHz) via RT/SYNC pin or external clock sync. Its dual-MOSFET synchronous architecture eliminates external catch diodes and enables bidirectional current flow for DDR termination.
It features three operating modes selected by the MODE pin: Burst Mode® (70µA quiescent current), pulse-skipping, and forced continuous mode (reduced EMI). Internal compensation and Active Voltage Positioning (AVP) are enabled when ITH is tied to SVIN, supporting fast transient response across wide load and capacitor ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A sinking for DDR memory termination |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion and fixed low-voltage rails |
| Quiescent Current | 70µA in Burst Mode® sleep; ≤1µA in shutdown |
| Output Accuracy | ±1% over –40°C to 150°C; 0.6V internal reference with 0.589V–0.611V min/max |
| Switching Frequency | Programmable 300kHz–4MHz; internal default 2.25MHz; sync-capable up to 4MHz |
| Duty Cycle | 100% supported; enables ultra-low dropout operation during battery discharge |
| Thermal Rating | Rated for –40°C to 150°C junction temperature; θJA = 38°C/W (TSSOP) |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package), thermally enhanced with exposed PGND pad (Pin 21) requiring PCB soldering for rated thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1) | Signal Input Supply | Powers internal control circuitry; monitored by UVLO (1.7V–2.25V threshold) |
| RUN (Pin 2) | Enable Control | Active-high enable; <0.4V disables regulator and reduces supply current to ≤1µA |
| PGOOD (Pin 3) | Power Good Indicator | Open-drain output asserting when VFB is within ±7.5% of setpoint for >105µs |
| MODE (Pin 4) | Operating Mode Select | Configures Burst Mode® (SGND), pulse-skipping (SVIN), or forced continuous (1.1V–0.58×SVIN) |
| VFB (Pin 5) | Feedback Input | Senses resistive divider output; referenced to 0.6V internal bandgap |
| ITH (Pin 6) | Error Amplifier Compensation | Controls peak inductor current; tie to SVIN for internal compensation and AVP |
| TRACK/SS (Pin 7) | Soft-Start / Tracking Input | Enables internal soft-start (tie to SVIN), external timing, or supply tracking |
| DDR (Pin 8) | DDR Mode Enable | Tie to SVIN to activate DDR termination mode and use TRACK/SS as external reference |
| RT/SYNC (Pin 9) | Oscillator Control | Set frequency with resistor-to-GND, sync to external clock (0.3–4MHz), or tie to SVIN for 2.25MHz |
| SGND (Pin 10) | Signal Ground | Reference for small-signal components; must connect to PGND at single point |
| SW (Pins 12,14,17,19) | Switch Node | Connects to inductor; drains of internal P- and N-channel MOSFETs |
| PVIN (Pins 15,16) | Main Power Input | Supplies P-channel top switch; independent of SVIN; may be lower than SVIN |
| PVIN_DRV (Pin 20) | Gate Driver Supply | Must be connected to PVIN; powers internal gate drivers |
| PGND (Pin 21) | Power Ground | Exposed pad; connects to source of N-channel bottom switch; requires PCB soldering |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 70µA while maintaining regulation-critical for Li-Ion standby life |
| 100% Duty Cycle Capability | Extends battery runtime by sustaining output as input drops to VOUT + RDS(ON)×IOUT |
| DDR Memory Termination Support | Provides ±1.5A bidirectional current for DDR2/DDR3 VTT rails with dedicated DDR pin control |
| Configurable Switching Noise | Forced continuous mode eliminates subharmonics; pulse-skipping balances ripple vs. efficiency |
| External Synchronization | Accepts 0.3–4MHz clock on RT/SYNC to eliminate beat frequencies in multi-rail systems |
| Internal AVP with ITH Tie | Enables active voltage positioning for improved transient response without external compensation parts |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Regulating 1.2V/1.8V/2.5V rails for FPGA, ASIC, or microprocessor cores in compact embedded systems. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering up to 3A with tight line/load regulation and fast transient response. Use Value: High efficiency (>95%) and 100% duty cycle extend battery life; TSSOP-20 simplifies layout in space-constrained PoL designs. | Use Scenario: Providing matched sourcing/sinking current for DDR2/DDR3 VTT termination in laptops and servers. IC Role / Device Role / Timing Role: Bidirectional buck regulator configured in DDR mode to deliver ±1.5A with precise voltage tracking. Use Value: Eliminates need for discrete termination networks; internal DDR logic ensures rail stability during read/write transitions. |
| Portable Computer Systems | Handheld Devices |
Use Scenario: Powering core logic, display backlight, and I/O rails in ultrabooks and 2-in-1 devices using single-cell Li-Ion. IC Role / Device Role / Timing Role: Main system PMIC buck stage with low IQ Burst Mode® and robust thermal rating up to 150°C junction. Use Value: 70µA sleep current minimizes battery drain during suspend; 2.25V minimum VIN supports deep discharge operation. | Use Scenario: Supplying processor, RF transceiver, and sensor subsystems in smartphones and wearables. IC Role / Device Role / Timing Role: Compact, high-frequency (up to 4MHz) buck converter enabling use of 0805-size inductors and minimal footprint. Use Value: 4MHz switching allows smaller magnetics and reduced EMI filtering; TSSOP-20 aids automated assembly and rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315GJ-Z | 3A, 2.2–5.5V input, fixed 500kHz/1.5MHz freq, no sync, no DDR mode, QFN-10 | Lacks DDR termination, external sync, and 100% duty cycle; lower thermal rating (125°C) | Lower-cost option where DDR support and extended temperature are not required |
| TPS54331DR | 3A, 3.5–28V input, adjustable freq 100kHz–2.5MHz, no DDR mode, SOIC-8 | Higher VIN range unsuitable for Li-Ion; no sinking capability; larger package; no Burst Mode® | Preferred for industrial 12V/24V rails but incompatible with portable battery inputs or DDR loads |
Compared with MP2315GJ-Z and TPS54331DR, the LTC3612HFE#TRPBF uniquely combines DDR termination, 100% duty cycle, 70µA Burst Mode®, and –40°C to 150°C operation in a thermally optimized TSSOP, making it optimal for high-reliability portable and memory-intensive applications.
Availability
LTC3612HFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3612HFE#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3612HFE#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, thermally robust power conversion in battery-powered and DDR-critical applications.
FAQ
What is the maximum junction temperature rating for the LTC3612HFE#TRPBF?
The LTC3612HFE#TRPBF is specified for operation from –40°C to 150°C junction temperature. This H-grade rating is validated per Linear Technology's characterization and testing protocols, and the TSSOP package achieves θJA = 38°C/W under standard JEDEC conditions. Proper PCB thermal design-including soldering the exposed PGND pad-is required to maintain reliability at 150°C.
Does the LTC3612HFE#TRPBF support DDR memory termination, and how is it configured?
Yes, the LTC3612HFE#TRPBF supports DDR memory termination with ±1.5A sourcing/sinking capability. To enable DDR mode, tie the DDR pin (Pin 8) to SVIN. This reconfigures TRACK/SS as an external reference input and activates bidirectional current control. The device then regulates VTT to half the TRACK/SS voltage, supporting DDR2/DDR3 termination requirements without external op-amps or discrete FETs.
How does the MODE pin affect efficiency and noise performance in the LTC3612HFE#TRPBF?
The MODE pin selects between four operating modes in the LTC3612HFE#TRPBF: Burst Mode® (SGND), pulse-skipping (SVIN), forced continuous (1.1V–0.58×SVIN), and external-clamp Burst Mode® (0.45V–0.8V). Burst Mode® delivers 70µA IQ for highest light-load efficiency but increases output ripple; forced continuous minimizes ripple and EMI at the cost of higher quiescent current-enabling optimization for noise-sensitive signal chains.
Can the LTC3612HFE#TRPBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3612HFE#TRPBF can synchronize to an external clock applied to the RT/SYNC pin (Pin 9). It accepts TTL/CMOS-compatible signals from 0.3MHz to 4MHz. During sync, slope compensation automatically adapts to the external frequency, preserving current-mode stability. This feature eliminates beat frequencies in multi-regulator systems and enables EMI reduction through spread-spectrum clock alignment.
What is the purpose of the ITH pin in the LTC3612HFE#TRPBF, and how does tying it to SVIN change operation?
The ITH pin in the LTC3612HFE#TRPBF sets the peak inductor current threshold via the error amplifier output. Tying ITH to SVIN enables internal compensation and Active Voltage Positioning (AVP), which dynamically adjusts the output voltage based on load current to improve transient response. This eliminates external compensation components and provides optimized stability across varying output capacitors and load conditions without manual tuning.
LTC3612HFE#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
LTC3612HFE#TRPBF FAQ
1.How can I place an order for LTC3612HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612HFE#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 LTC3612HFE#TRPBF reliable?
The price and inventory of LTC3612HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612HFE#TRPBF?
LTC3612HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612HFE#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 LTC3612HFE#TRPBF?
For technical support, including LTC3612HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3612HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612HFE#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 LTC3612HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612HFE#TRPBF?
All LTC3612HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612HFE#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 LTC3612HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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