My Inquiry
My Account
Analog Devices Inc. LTC3612IFE#PBF
- Part No.:
- LTC3612IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3612IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,153
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3612IFE#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 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 LTC3612IFE#PBF datasheet, LTC3612IFE#PBF pinout, LTC3612IFE#PBF application, or LTC3612IFE#PBF equivalent, key selection considerations include its 20-pin TSSOP package with exposed PGND pad, DDR memory termination support (±1.5A), programmable soft-start via TRACK/SS, and selectable operating modes (Burst/Pulse-Skipping/Forced Continuous) for noise-sensitive or high-efficiency designs.
Technical Context
The LTC3612IFE#PBF implements constant-frequency current-mode control with internal P-channel high-side and N-channel synchronous rectifier switches. Its error amplifier drives the ITH pin to regulate peak inductor current, while MODE pin voltage selects between Burst Mode (internal/external clamp), Pulse-Skipping, or Forced Continuous operation - directly affecting light-load efficiency and output ripple.
It features dual reference architecture: 0.6V internal reference (DDR = SGND) or adjustable external reference (DDR = SVIN), enabling tracking and AVP. The RT/SYNC pin supports resistor-programmed frequency (300kHz–4MHz), external clock synchronization, or internal 2.25MHz oscillator - all with automatic slope compensation adaptation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A sinking for DDR termination applications |
| 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 - extends battery life |
| Switching Frequency | Programmable up to 4MHz; enables use of sub-1µH inductors and compact layouts |
| Output Accuracy | ±1% over temperature and line/load; ensures stable regulation for precision loads |
| Duty Cycle | 100% capability; maintains regulation down to VOUT + RDS(ON)_PCH × IOUT |
| Package | 20-pin plastic TSSOP with exposed thermal pad (PGND); θJA = 38°C/W |
Pinout & Package
The LTC3612IFE#PBF is housed in a 20-lead plastic TSSOP package with an exposed thermal pad (Pin 21) that must be soldered to PCB ground for rated 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 control circuitry; monitored by UVLO (1.7V/2.25V thresholds) |
| RUN (Pin 2) | Enable Input | Active-high enable; <0.4V disables regulator and reduces IQ to ≤1µA |
| PGOOD (Pin 3) | Open-Drain Power Good | Indicates VFB within ±7.5% window after 105µs blanking time |
| MODE (Pin 4) | Operating Mode Control | Selects 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 or external TRACK/SS voltage |
| ITH (Pin 6) | Error Amplifier Output | Controls peak inductor current; tied to SVIN enables internal compensation and AVP |
| TRACK/SS (Pin 7) | Soft-Start / Tracking / Reference | Enables internal soft-start (to SVIN), external timing (RC), or supply tracking (to another rail) |
| DDR (Pin 8) | DDR Mode Select | Tied to SGND → 0.6V ref; tied to SVIN → TRACK/SS as external reference for DDR termination |
| RT/SYNC (Pin 9) | Oscillator Control | Resistor-to-GND sets fSW (300kHz–4MHz); external clock sync up to 4MHz |
| SGND (Pin 10) | Signal Ground | Reference for small-signal pins; must connect to PGND at single point |
| SW (Pins 12,14,17,19) | Switch Node | Connects to inductor; shared node of internal PCH/NCH MOSFETs |
| PVIN (Pins 15,16) | Power Input Supply | Source of internal P-channel switch; may be lower than SVIN for efficiency optimization |
| PVIN_DRV (Pin 20) | Gate Driver Supply | Must be connected to PVIN to ensure proper high-side gate drive |
| PGND (Pin 21) | Power Ground | Exposed thermal pad; connects to source of internal N-channel switch and PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Eliminates external catch diode; improves efficiency up to 95% and reduces board area |
| Adjustable Compensation via ITH | Enables transient response optimization across wide load/output capacitor ranges |
| Programmable Soft-Start & Tracking | Prevents inrush current and enables controlled power-up sequencing with other supplies |
| DDR Memory Termination Support | Provides ±1.5A bidirectional current capability with dedicated DDR pin and tracking mode |
| Multiple Low-Noise Operating Modes | Forced Continuous (low ripple), Pulse-Skipping (moderate IQ), Burst Mode® (70µA IQ) |
Applications
| Point-of-Load Regulation | Portable Computing Power |
|---|---|
|
Use Scenario: Local 1.2V/1.8V supply for FPGA core or SoC I/O banks on dense PCBs with tight space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated output with fast transient response and minimal footprint. Use Value: 4MHz switching enables <1µH inductors; 20-pin TSSOP with exposed pad ensures thermal reliability at 3A load. |
Use Scenario: Main system rail in ultrabooks or tablets powered by single-cell Li-Ion (2.8V–4.2V). IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting dynamic voltage scaling and deep-sleep states. Use Value: 70µA Burst Mode® IQ extends battery runtime; 100% duty cycle sustains output during battery discharge. |
| DDR Memory Interface | Industrial Distributed Power |
|
Use Scenario: Termination supply for DDR3/DDR4 memory modules requiring bidirectional ±1.5A current sourcing/sinking. IC Role / Device Role / Timing Role: DDR-specific buck regulator with TRACK/SS-based tracking and DDR pin-enabled reference selection. Use Value: Internal 0.6V reference or external TRACK/SS reference ensures precise VTT regulation aligned with memory VDDQ. |
Use Scenario: Secondary 3.3V or 2.5V rail in industrial PLCs or edge controllers fed from 5V or 12V intermediate bus. IC Role / Device Role / Timing Role: Robust, thermally enhanced local regulator supporting extended temperature range (–40°C to 125°C). Use Value: TSSOP package with exposed PGND pad delivers 38°C/W θJA; integrated protection prevents latch-up under overload. |
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, 5.5V max VIN, fixed 500kHz/1MHz freq; no Burst Mode®, higher 125µA IQ | Lacks DDR termination mode and external tracking; less suitable for ultra-low-IQ portable designs | Choose for cost-sensitive industrial applications where 125µA IQ is acceptable and 4MHz switching not required |
| MP2315GJ-Z | 3A, 6V max VIN, 1.4MHz fixed freq; no MODE pin control, no DDR mode, no external sync | Single operating mode only; no programmable soft-start or AVP; limited flexibility in noise-sensitive systems | Choose for simple, fixed-frequency point-of-load use where pin count and feature set are secondary to BOM simplicity |
Compared with TPS54332DR and MP2315GJ-Z, the LTC3612IFE#PBF offers superior light-load efficiency via Burst Mode®, flexible frequency programming up to 4MHz, and dedicated DDR termination capability - making it optimal for portable, memory-intensive, and thermally constrained designs.
Availability
LTC3612IFE#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, portable computing power, DDR memory termination, and industrial distributed power applications requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade compliance.
Supply support for LTC3612IFE#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 high-performance analog and power management portfolio. Linear's legacy emphasizes precision, efficiency, and robustness in power conversion ICs.
The LTC3612IFE#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-density, high-efficiency DC/DC conversion in space- and power-constrained applications including portable electronics and memory subsystems.
FAQ
What is the maximum switching frequency supported by the LTC3612IFE#PBF?
The LTC3612IFE#PBF supports a maximum switching frequency of 4MHz when synchronized to an external clock signal applied to the RT/SYNC pin. It can also be resistor-programmed from 300kHz to 4MHz, or operate at its internal default frequency of 2.25MHz when RT/SYNC is tied to SVIN. This high-frequency capability allows use of very small inductors and capacitors, reducing solution size significantly.
Does the LTC3612IFE#PBF support DDR memory termination, and how is it configured?
Yes, the LTC3612IFE#PBF supports DDR memory termination with ±1.5A bidirectional current capability. Configuration requires tying the DDR pin (Pin 8) to SVIN to enable DDR mode, which repurposes the TRACK/SS pin as an external reference input. In this mode, the regulator tracks an external voltage reference, enabling precise VTT regulation aligned with DDR VDDQ - critical for signal integrity in high-speed memory interfaces.
How does the MODE pin affect operating behavior in the LTC3612IFE#PBF?
The MODE pin (Pin 4) of the LTC3612IFE#PBF selects among four distinct operating modes: grounding it enables Burst Mode® with internal clamp (70µA IQ); connecting it to SVIN enables Pulse-Skipping Mode (moderate IQ, reduced ripple); applying 1.1V–0.58×SVIN enables Forced Continuous Mode (lowest ripple, highest noise); and applying 0.45V–0.8V enables externally clamped Burst Mode. Each setting directly determines light-load efficiency, output ripple, and EMI profile.
What thermal design considerations apply to the LTC3612IFE#PBF in TSSOP package?
The LTC3612IFE#PBF in 20-pin TSSOP has a thermal resistance θJA of 38°C/W. Its exposed PGND pad (Pin 21) must be soldered to a minimum 100mm² copper area on the PCB to achieve rated performance. At 3A load and 5V input, power dissipation reaches ~0.5W; without adequate copper pour and vias, junction temperature may exceed 125°C. Thermal simulation and IR imaging are recommended for high-ambient or sealed-environment deployments.
Can the LTC3612IFE#PBF operate with input voltage below 2.5V, and what limitations apply?
Yes, the LTC3612IFE#PBF operates down to 2.25V input. However, at low VIN near VOUT, RDS(ON) of the internal P-channel switch increases significantly - e.g., from 70mΩ at 3.3V to >100mΩ at 2.5V - raising conduction loss and thermal stress. Also, 100% duty cycle operation reduces headroom for regulation margin. Designers must verify power dissipation and output stability under worst-case low-VIN, high-IOUT conditions using the device's efficiency vs. VIN curves.
LTC3612IFE#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
LTC3612IFE#PBF FAQ
1.How can I place an order for LTC3612IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612IFE#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 LTC3612IFE#PBF reliable?
The price and inventory of LTC3612IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3612IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612IFE#PBF?
LTC3612IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612IFE#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 LTC3612IFE#PBF?
For technical support, including LTC3612IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612IFE#PBF requirements.
6.How does Aetrix verify that LTC3612IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3612IFE#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 LTC3612IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3612IFE#PBF?
All LTC3612IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612IFE#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 LTC3612IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3612IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3612IFE#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
