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Analog Devices Inc. LTC3612MPFE#TRPBF
- Part No.:
- LTC3612MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3612MPFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,184
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Product details
Overview
LTC3612MPFE#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 DDR memory termination and portable Li-Ion systems.
For engineers reviewing the LTC3612MPFE#TRPBF datasheet, LTC3612MPFE#TRPBF pinout, LTC3612MPFE#TRPBF application, or LTC3612MPFE#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature range, internal 2.25MHz oscillator (RT/SYNC = SVIN), 70µA sleep-mode quiescent current, and DDR mode support via dedicated DDR pin - all critical for ruggedized point-of-load designs.
Technical Context
The LTC3612MPFE#TRPBF uses a constant-frequency, current-mode control architecture with programmable switching frequency up to 4MHz. Its dual MOSFET power stage integrates a P-channel high-side switch (70mΩ typical RDS(ON)) and N-channel synchronous rectifier (45mΩ), eliminating external diode requirements.
It implements three distinct operating modes via the MODE pin: Burst Mode® (70µA IQ at no load), pulse-skipping (lower ripple than Burst), and forced continuous (required for sink-current capability and EMI-sensitive applications). The ITH pin enables adjustable compensation and active voltage positioning (AVP) when tied to SVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A bidirectional current in DDR mode for memory VTT regulation. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single-cell Li-Ion (2.7–4.2V) and fixed 3.3V/5V rails. |
| Output Voltage Accuracy | ±1% over –55°C to 150°C; ensures stable core/memory rail regulation across extreme environments. |
| Quiescent Current | 70µA in Burst Mode® sleep; extends battery life in always-on portable systems without compromising wake-up response. |
| Switching Frequency | Programmable 300kHz–4MHz; enables use of sub-1µH inductors and minimizes size in space-constrained layouts. |
| Shutdown Current | ≤1µA; allows full system power gating while maintaining ultra-low standby leakage. |
| Duty Cycle | 100% capability; sustains regulated output even as input drops to VOUT + (ILOAD × RDS(ON)), critical for brownout resilience. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE), –55°C to 150°C operating junction temperature, exposed pad (Pin 21) connected to PGND for thermal performance (θJA = 38°C/W).
| 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; <0.4V disables regulator and reduces supply current to ≤1µA. |
| PGOOD (Pin 3) | Power Good Monitor | Open-drain output asserting high only when VFB remains within ±7.5% window for >105µs. |
| 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 | Compares resistive divider output against 0.6V reference; sets regulated VOUT = 0.6V × (1 + R1/R2). |
| ITH (Pin 6) | Error Amplifier Output | Controls peak inductor current threshold; tie to SVIN to enable internal AVP compensation. |
| TRACK/SS (Pin 7) | Soft-Start / Tracking | Enables internal soft-start (to SVIN), external RC timing, or supply tracking; also serves as external reference input in DDR mode. |
| DDR (Pin 8) | DDR Mode Enable | Tie to SVIN to activate DDR termination mode (±1.5A sink/source); tie to SGND for standard 0.6V reference. |
| RT/SYNC (Pin 9) | Frequency Control | Set oscillator via resistor-to-GND (300kHz–4MHz), sync to external clock (≤4MHz), or tie to SVIN for 2.25MHz internal default. |
| SGND (Pin 10) | Signal Ground | Reference for all analog circuitry; must connect to PGND at single point to avoid noise coupling. |
| SW (Pins 12,14,17,19) | Switch Node | Connects to inductor; carries high di/dt switching current; requires tight layout and low-inductance path to PGND. |
| PVIN (Pins 15,16) | Power Input | Supplies high-side P-MOSFET source; may be same as or lower than SVIN to reduce gate drive loss. |
| PVIN_DRV (Pin 20) | Gate Driver Supply | Must be tied directly to PVIN; powers internal gate drivers for optimal switching efficiency. |
| PGND (Pin 21) | Power Ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal dissipation and low-noise return path. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables dropout regulation down to VIN = VOUT, extending runtime in battery-powered systems during voltage sag. |
| DDR Memory Termination Mode | Provides ±1.5A bidirectional current sourcing/sinking for DDR2/DDR3 VTT rails with fast transient response. |
| Adjustable Burst Clamp via MODE Pin | External voltage on MODE pin (0.45V–0.8V) sets minimum ITH threshold, enabling optimized light-load efficiency across temperature. |
| Programmable Soft-Start | Internal 1ms soft-start (TRACK/SS = SVIN) or user-defined ramp via RC network prevents inrush current and output overshoot. |
| Active Voltage Positioning (AVP) | Internal compensation enabled by tying ITH to SVIN; dynamically lowers VOUT under load to reduce IR drop in high-current paths. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Powering FPGA core voltage (1.0V–1.2V) or ASIC I/O rails in industrial control modules requiring stable 3A delivery. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC output with fast transient response. Use Value: 70µA sleep current and 100% duty cycle extend operational time between charges; ±1% accuracy ensures logic-level compliance across temperature. | Use Scenario: Providing matched ±1.5A sink/source for DDR3 VTT termination in telecom baseband processors. IC Role / Device Role / Timing Role: DDR mode-enabled buck-boost capable regulator managing bidirectional current flow during memory read/write cycles. Use Value: Dedicated DDR pin and internal current-sense architecture eliminate need for external current-sense resistors or discrete FETs, reducing BOM count and board area. |
| Portable Computer Systems | Handheld Medical Devices |
Use Scenario: Generating 1.8V system rail from single Li-Ion cell in ultrabook subsystems with strict thermal constraints. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in Burst Mode® at light loads and forced continuous under CPU burst loads. Use Value: 95% peak efficiency and 38°C/W θJA minimize self-heating; 20-pin TSSOP allows compact placement near processor. | Use Scenario: Powering precision analog front-end (AFE) and low-power MCU in battery-operated glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter supplying clean 3.3V rail with minimal standby drain during sensor sleep intervals. Use Value: ≤1µA shutdown current and –55°C to 150°C rating ensure reliable operation in cold storage or sterilization 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 |
|---|---|---|---|
| LTC3612EFE#TRPBF | Same silicon, rated for –40°C to 125°C (vs. –55°C to 150°C for MP grade); identical electrical specs and pinout. | Suitable for commercial/industrial ambient conditions but not extended military or automotive under-hood use. | Select when full MP-grade temperature range is unnecessary and cost optimization is prioritized. |
| TPS54332DR | 3A, 28V-input buck; higher VIN max, lower switching frequency (up to 2.5MHz), no DDR mode or AVP; 16-pin SOIC package. | Lacks bidirectional current capability and advanced low-IQ modes; better suited for general-purpose 12V/24V intermediate bus conversion. | Choose only if input voltage exceeds 5.5V or DDR functionality is not required; verify thermal derating for 3A at 125°C ambient. |
Compared with LTC3612EFE#TRPBF, the LTC3612MPFE#TRPBF offers guaranteed operation down to –55°C and up to 150°C junction temperature, making it suitable for aerospace, defense, and harsh-environment deployments where extended thermal validation is mandatory; versus TPS54332DR, it provides superior light-load efficiency, integrated DDR support, and smaller footprint but requires ≤5.5V input.
Availability
LTC3612MPFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3612MPFE#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 LTC3612MPFE#TRPBF belongs to Linear's high-performance monolithic DC/DC converter family, designed specifically for demanding point-of-load and DDR memory applications where efficiency, thermal robustness, and mode flexibility are critical.
FAQ
What is the operating temperature range of the LTC3612MPFE#TRPBF?
The LTC3612MPFE#TRPBF is fully specified and tested over a junction temperature range of –55°C to 150°C. This extended range supports deployment in aerospace, defense, and industrial applications where ambient conditions exceed standard commercial or industrial grades. The device incorporates overtemperature protection that activates above 150°C to prevent permanent damage, and its thermal design (θJA = 38°C/W) requires proper PCB copper pour and exposed pad soldering for rated performance.
Does the LTC3612MPFE#TRPBF support DDR memory termination?
Yes, the LTC3612MPFE#TRPBF supports DDR memory termination through its dedicated DDR pin (Pin 8). When DDR is tied to SVIN, the device enters DDR mode and delivers ±1.5A bidirectional current for VTT regulation. In this mode, TRACK/SS functions as an external reference input, and the internal error amplifier adjusts to maintain precise voltage tracking. This eliminates external current-sense components and simplifies layout for DDR2/DDR3 systems.
How do I configure the LTC3612MPFE#TRPBF for forced continuous conduction mode?
To configure the LTC3612MPFE#TRPBF for forced continuous conduction mode, apply a voltage between 1.1V and 0.58×SVIN to the MODE pin (Pin 4). For example, with SVIN = 3.3V, a 1.5V bias on MODE enables forced continuous operation. This mode ensures uninterrupted inductor current flow, minimizing output voltage ripple and keeping switching harmonics predictable - essential for noise-sensitive analog circuits or EMI-critical designs.
What is the minimum input voltage required for the LTC3612MPFE#TRPBF to start up?
The LTC3612MPFE#TRPBF requires a minimum input voltage of 2.25V on the SVIN pin to initiate startup and exit undervoltage lockout (UVLO). The UVLO threshold is 2.25V (rising) and 1.7V (falling), providing hysteresis to prevent oscillation near the turn-on point. Below 2.25V, the RUN pin remains inactive and the device stays in shutdown, drawing ≤1µA. This makes the LTC3612MPFE#TRPBF suitable for single-cell Li-Ion applications where voltage sags below 3.0V during discharge.
Can the LTC3612MPFE#TRPBF synchronize to an external clock?
Yes, the LTC3612MPFE#TRPBF can synchronize to an external clock signal applied to the RT/SYNC pin (Pin 9). The device accepts TTL/CMOS-compatible clock inputs from 0.3MHz to 4MHz, automatically adapting slope compensation to maintain stable current-mode operation. External synchronization eliminates beat frequencies in multi-regulator systems and enables EMI reduction through spread-spectrum clocking or fixed-frequency alignment with system timing references.
LTC3612MPFE#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
LTC3612MPFE#TRPBF FAQ
1.How can I place an order for LTC3612MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612MPFE#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 LTC3612MPFE#TRPBF reliable?
The price and inventory of LTC3612MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612MPFE#TRPBF?
LTC3612MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612MPFE#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 LTC3612MPFE#TRPBF?
For technical support, including LTC3612MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612MPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3612MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612MPFE#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 LTC3612MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612MPFE#TRPBF?
All LTC3612MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612MPFE#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 LTC3612MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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