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Analog Devices Inc. LTC3612HFE#PBF
- Part No.:
- LTC3612HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3612HFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
LTC3612HFE#PBF 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 low-dropout operation. It serves as a high-efficiency point-of-load regulator in battery-powered portable systems requiring stable 0.6V–output rails.
For engineers reviewing the LTC3612HFE#PBF datasheet, LTC3612HFE#PBF pinout, LTC3612HFE#PBF application, or LTC3612HFE#PBF equivalent, key selection considerations include its forced continuous/Burst Mode/pulse-skipping mode flexibility, DDR memory termination capability (±1.5A), programmable soft-start, and thermal performance in the –40°C to 150°C junction range.
Technical Context
The LTC3612HFE#PBF implements a constant-frequency, current-mode architecture with dual internal MOSFETs (70mΩ P-ch top / 45mΩ N-ch bottom), adjustable compensation via ITH pin, and selectable operating modes controlled by the MODE pin voltage. Its oscillator supports external resistor programming (300kHz–4MHz), synchronization to external clock (up to 4MHz), or internal 2.25MHz default.
It features active voltage positioning (AVP) when ITH is tied to SVIN, DDR mode activation via DDR pin, and precision tracking/soft-start via TRACK/SS pin. Power good monitoring uses ±7.5% window detection with 105µs blanking time and open-drain PGOOD output referenced to SGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A sinking in DDR mode for memory termination compliance. |
| Input Voltage Range | 2.25V to 5.5V; enables single Li-Ion (2.7–4.2V) and fixed low-voltage rail use without external LDO pre-regulation. |
| Output Voltage Accuracy | ±1% over temperature; ensures tight regulation for core logic and DDR VTT/VREF supplies. |
| Quiescent Current | 70µA in Burst Mode sleep; maintains regulation at no load while minimizing battery drain in standby. |
| Switching Frequency | Up to 4MHz; allows use of sub-1µH inductors and compact ceramic output capacitors for space-constrained PCBs. |
| Shutdown Current | ≤1µA; enables deep power-down in system-level sleep states without leakage concerns. |
| Duty Cycle | 100% capability; sustains regulated output down to VIN ≈ VOUT + IRDS(ON), extending runtime in battery discharge phase. |
Pinout & Package
The LTC3612HFE#PBF is packaged in a thermally enhanced 20-lead plastic TSSOP (FE package) with exposed pad (Pin 21 = PGND) soldered to PCB ground for optimal thermal performance (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 internal control circuitry and feeds UVLO comparator; must be ≥2.25V for operation. |
| RUN (Pin 2) | Enable Control | Active-high logic input; <0.4V disables regulator and reduces supply current to ≤1µA. |
| PGOOD (Pin 3) | Power Good Monitor | Open-drain output pulled low if VFB deviates >±7.5%; requires external pull-up for system sequencing. |
| MODE (Pin 4) | Operating Mode Select | Voltage-controlled selection: SGND = Burst Mode, SVIN = pulse-skipping, 1.1V–0.58×SVIN = forced continuous. |
| VFB (Pin 5) | Feedback Input | Senses resistive divider output; internal 0.6V reference sets nominal VOUT = 0.6V × (1 + R1/R2). |
| ITH (Pin 6) | Error Amplifier Output | Compensation node; tie to SVIN for AVP mode or add RC network for transient optimization. |
| TRACK/SS (Pin 7) | Soft-Start/Tracking Input | Enables internal soft-start (tie to SVIN), external timing (RC), or supply tracking (connect to master rail). |
| DDR (Pin 8) | DDR Mode Enable | Tie to SVIN to activate ±1.5A sinking capability and shift PGOOD window for DDR VTT applications. |
| RT/SYNC (Pin 9) | Oscillator Control | Set frequency with resistor-to-GND, synchronize to external clock (0.3–4MHz), or tie to SVIN for 2.25MHz default. |
| SGND (Pin 10) | Signal Ground | Reference for all small-signal pins; must connect to PGND at single point near input/output caps. |
| PVIN_DRV (Pin 20) | Gate Driver Supply | Must be connected directly to PVIN; powers internal gate drivers for both MOSFETs. |
| PGND (Pin 21) | Power Ground | Exposed thermal pad; electrically and thermally connects to source of bottom MOSFET-must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | Eliminates external catch diode; 70mΩ/45mΩ RDS(ON) MOSFETs enable >95% peak efficiency and reduce BOM count. |
| Multi-Mode Operation Selection | Four distinct modes (Burst, pulse-skipping, forced continuous, external-clamp Burst) optimize efficiency vs. noise trade-offs per load condition. |
| DDR Memory Termination Support | ±1.5A bidirectional current capability with automatic PGOOD window adjustment meets JEDEC DDR3/DDR4 VTT requirements. |
| Programmable Soft-Start & Tracking | TRACK/SS pin enables precise power-up sequencing across multiple rails without additional ICs or discrete timers. |
| Robust Thermal Rating | Rated for –40°C to 150°C junction temperature; qualified for automotive under-hood and industrial high-temp environments. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Regulating 1.2V/1.8V/2.5V core voltages for FPGA, ASIC, or microprocessor subsystems on dense PCBs with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering up to 3A with fast transient response and minimal output ripple. Use Value: High efficiency (>92% at 1A, 3.3VIN→1.2VOUT) and 4MHz switching reduce inductor size and improve dynamic load handling. | Use Scenario: Providing JEDEC-compliant VTT termination for DDR3/DDR4 memory interfaces in laptops, servers, and embedded computing platforms. IC Role / Device Role / Timing Role: Bidirectional sink/source regulator operating in DDR mode with ±1.5A current capability and adaptive PGOOD monitoring. Use Value: Eliminates need for discrete op-amp + MOSFET solutions; simplifies layout and guarantees DDR timing margin compliance. |
| Portable Computer Power | Handheld Device PMIC Subsystem |
Use Scenario: Generating stable 1.05V–1.8V processor I/O and memory rails from single-cell Li-Ion battery (2.8–4.2V) in ultrabooks and 2-in-1 devices. IC Role / Device Role / Timing Role: High-efficiency step-down converter with 70µA Burst Mode IQ and 100% duty cycle dropout support. Use Value: Extends battery life during light-load idle states while maintaining fast wake-up response and low output noise. | Use Scenario: Powering application processors, display drivers, and RF modules in smartphones and tablets where board space and thermal density are critical. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC regulator in 20-pin TSSOP package with integrated compensation and soft-start. Use Value: Reduces solution footprint by >40% vs. discrete controllers; exposed PGND pad enables direct thermal coupling to PCB copper. |
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 input, fixed 500kHz freq, no DDR mode, lower temp grade (–40°C to 125°C) | Lacks bidirectional sinking and AVP; suited for general-purpose industrial rails, not DDR-specific designs | Select when cost sensitivity outweighs DDR compliance and high-temp operation needs. |
| MP2315GJ-Z | 3A, 6V max input, 1.4MHz fixed freq, no MODE pin flexibility, smaller QFN (3×3mm), no DDR mode | No programmable modes or tracking; limited to basic step-down with simpler control interface | Choose for space-constrained consumer electronics where Burst Mode and DDR features are unnecessary. |
Compared with TPS54332DR and MP2315GJ-Z, the LTC3612HFE#PBF provides unique DDR termination capability, wider temperature rating (–40°C to 150°C), and multi-mode operation control-making it the only option among the three qualified for automotive-grade memory subsystems and high-reliability portable computing.
Availability
LTC3612HFE#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3612HFE#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 full product support, documentation, and qualification for all Linear-branded power ICs including the LTC3612 series.
The LTC3612 product line targets high-efficiency, high-frequency synchronous buck conversion for space- and thermal-constrained portable and computing applications, with emphasis on low IQ, multi-mode flexibility, and DDR compliance.
FAQ
What is the maximum junction temperature rating for the LTC3612HFE#PBF?
The LTC3612HFE#PBF is rated for operation up to 150°C junction temperature, with guaranteed specifications over the –40°C to 150°C range. This high-temperature qualification makes the LTC3612HFE#PBF suitable for under-hood automotive and industrial environments where ambient temperatures exceed standard commercial grades. Thermal design must account for θJA = 38°C/W in the TSSOP package and ensure adequate PCB copper area under the exposed PGND pad.
Does the LTC3612HFE#PBF support DDR memory termination, and how is it enabled?
Yes, the LTC3612HFE#PBF supports DDR memory termination with ±1.5A sinking and sourcing capability. To enable DDR mode, the DDR pin (Pin 8) must be tied to SVIN. This activates bidirectional current control and shifts the PGOOD voltage window to track the TRACK/SS pin voltage-ensuring correct power-good assertion during DDR VTT ramp-up/down sequences. The LTC3612HFE#PBF is explicitly specified for DDR3/DDR4 termination in its Applications section.
How does the MODE pin configure operating modes on the LTC3612HFE#PBF?
The MODE pin on the LTC3612HFE#PBF selects between four operating modes based on applied voltage: tying to SGND enables Burst Mode with internal clamp; tying to SVIN enables pulse-skipping mode; applying 1.1V to 0.58×SVIN enables forced continuous mode; and applying 0.45V–0.8V enables externally clamped Burst Mode. Each mode affects light-load efficiency, output ripple, and EMI profile-allowing designers to optimize for battery life, noise sensitivity, or DDR compliance without changing hardware.
What is the purpose of the TRACK/SS pin on the LTC3612HFE#PBF, and what functions does it support?
The TRACK/SS pin on the LTC3612HFE#PBF provides three configurable functions: internal soft-start (tie to SVIN), external soft-start timing (RC network to ground and SVIN), or supply tracking (connect to master rail voltage). In tracking mode, the LTC3612HFE#PBF regulates its output to follow the master rail's ramp rate-enabling precise power sequencing across multiple voltage domains. This eliminates need for external sequencers in complex multi-rail systems.
Can the LTC3612HFE#PBF operate with input voltage below 2.5V, and what limitations apply?
Yes, the LTC3612HFE#PBF operates down to 2.25V input, supporting single-cell Li-Ion batteries at end-of-discharge. However, RDS(ON) of both internal MOSFETs increases at low VIN, raising conduction losses and thermal stress-especially at 100% duty cycle. Designers must verify power dissipation using typical RDS(ON) vs. VIN curves (Figure G21) and ensure junction temperature remains ≤150°C with appropriate PCB thermal design and load conditions.
LTC3612HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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):
- 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#PBF FAQ
1.How can I place an order for LTC3612HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612HFE#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 LTC3612HFE#PBF reliable?
The price and inventory of LTC3612HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3612HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612HFE#PBF?
LTC3612HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612HFE#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 LTC3612HFE#PBF?
For technical support, including LTC3612HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612HFE#PBF requirements.
6.How does Aetrix verify that LTC3612HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3612HFE#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 LTC3612HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3612HFE#PBF?
All LTC3612HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612HFE#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 LTC3612HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3612HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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