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Analog Devices Inc. LTC3612MPUDC#TRPBF
- Part No.:
- LTC3612MPUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3612MPUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,258
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Product details
Overview
LTC3612MPUDC#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, 0.6V adjustable output, and 70µA quiescent current in Burst Mode. It delivers high efficiency up to 95% and supports 100% duty cycle for low-dropout operation in battery-powered systems such as portable computers and DDR memory termination.
For engineers reviewing the LTC3612MPUDC#TRPBF datasheet, LTC3612MPUDC#TRPBF pinout, LTC3612MPUDC#TRPBF application, or LTC3612MPUDC#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, 20-pin 3mm × 4mm QFN package with exposed PGND pad, selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), and DDR memory mode supporting ±1.5A sink/source capability.
Technical Context
The LTC3612MPUDC#TRPBF implements a constant-frequency, current-mode architecture with programmable oscillator (300kHz–4MHz) via RT/SYNC pin or external clock synchronization. Its dual-MOSFET synchronous rectification eliminates external catch diodes, while internal compensation and optional Active Voltage Positioning (AVP) enable transient optimization across wide load and capacitor ranges.
It features four distinct operating modes selected by the MODE pin voltage: Burst Mode (internal/external clamp), Pulse-Skipping, and Forced Continuous-each with defined ITH threshold behavior and ripple/noise trade-offs. The device integrates undervoltage lockout (1.7V/2.25V thresholds), power-good monitoring with 70–140µs blanking, and short-circuit foldback protection that reduces peak inductor current as VOUT drops below 50%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; enables point-of-load regulation for microprocessors and DDR memory rails. |
| Input Voltage Range | 2.25V to 5.5V; supports single Li-Ion and fixed low-voltage supplies without external LDO pre-regulation. |
| Quiescent Current | 70µA in Burst Mode sleep; extends battery runtime in always-on portable devices. |
| Switching Frequency | Up to 4MHz; allows use of sub-1µH inductors and compact ceramic output capacitors. |
| Feedback Accuracy | ±1% over –55°C to 150°C; ensures stable output under extreme environmental conditions. |
| Duty Cycle | 100% capability; maintains regulation down to VIN ≈ VOUT + RDS(ON)_PCH × IOUT, critical for battery end-of-life operation. |
| Shutdown Current | ≤1µA; meets ultra-low-power system-level standby requirements. |
Pinout & Package
Package: 20-pin (3mm × 4mm) plastic QFN with exposed thermal pad (Pin 21 = PGND), rated for –55°C to 150°C junction temperature and θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DDR (Pin 1) | DDR Mode Select | Tying to SVIN enables DDR termination mode with ±1.5A sink/source and TRACK/SS as external reference input. |
| RT/SYNC (Pin 2) | Oscillator Control | Configures switching frequency via resistor-to-GND, external clock sync up to 4MHz, or internal 2.25MHz default when tied to SVIN. |
| SGND (Pin 3) | Signal Ground Reference | Reference node for feedback divider, compensation network, and small-signal circuitry; must connect to PGND at single point. |
| SW (Pins 5,6,11,12) | Switch Node | Connection point for power inductor; ties to drains of internal PCH/NCH MOSFETs; requires low-inductance layout. |
| PVIN (Pins 8,9) | Main Power Input | Supplies P-channel MOSFET source; may be lower than SVIN to reduce gate drive losses in dropout conditions. |
| SVIN (Pin 14) | Control Circuit Supply | Powers internal bias, error amplifier, and comparators; monitored for UVLO (1.7V/2.25V thresholds). |
| RUN (Pin 15) | Enable Input | Active-high logic; grounding forces shutdown with ≤1µA supply current and active PGOOD pull-down. |
| PGOOD (Pin 16) | Power-Good Indicator | Open-drain output asserting when VFB stays within ±7.5% window for >105µs; actively pulls down in shutdown. |
| MODE (Pin 17) | Operating Mode Select | Voltage-controlled selection: SGND = Burst Mode (internal clamp), SVIN = Pulse-Skipping, 1.1V–0.58×SVIN = Forced Continuous. |
| VFB (Pin 18) | Feedback Input | Senses resistive divider output; referenced to 0.6V internal bandgap; ±1% accuracy over full temp range. |
| ITH (Pin 19) | Error Amplifier Output | Controls peak inductor current threshold; tied to SVIN enables internal compensation and AVP mode. |
| TRACK/SS (Pin 20) | Soft-Start/Tracking/Ref | Enables internal soft-start (tSS = 0.65–1.5ms), external tracking, or external reference input for precision sequencing. |
| PGND (Pin 21) | Power Ground | Exposed thermal pad; connects to source of N-channel MOSFET; must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated PCH/NCH MOSFETs eliminate external catch diode, reducing BOM count and board area while improving efficiency. |
| Extended Temperature Grade | –55°C to 150°C operation verified and tested; suitable for aerospace, military, and under-hood automotive applications. |
| Multi-Mode Operation | Selectable Burst/Pulse-Skipping/Forced Continuous modes optimize efficiency vs. noise vs. sink capability per application need. |
| DDR Memory Support | ±1.5A bidirectional current capability with dedicated DDR pin enables precise VTT termination for DDR2/DDR3 interfaces. |
| Programmable Soft-Start | Internal (0.65–1.5ms) or external RC-controlled soft-start prevents inrush current and enables power sequencing. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Regulating core voltage for low-power microcontrollers in industrial IoT edge nodes operating from single-cell Li-Ion batteries. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.2V/3A output with 100% duty cycle support during battery discharge to 2.5V. Use Value: 95% peak efficiency and 70µA Burst Mode IQ extend operational runtime by >30% versus non-synchronous alternatives. | Use Scenario: Providing matched VTT termination for DDR3 memory subsystems in ruggedized medical imaging equipment. IC Role / Device Role / Timing Role: Bidirectional ±1.5A sink/source regulator configured in DDR mode with TRACK/SS used for VREF tracking. Use Value: Tight ±1% output accuracy over –55°C to 150°C ensures signal integrity and timing margin compliance across thermal extremes. |
| Portable Computer Systems | Handheld Test Equipment |
Use Scenario: Generating 1.8V system rail for FPGA I/O banks in ultra-thin laptop designs with strict height and thermal constraints. IC Role / Device Role / Timing Role: High-frequency (3.5MHz) synchronous buck converter using 0.68µH inductor and 22µF ceramic output caps. Use Value: 4MHz max switching frequency enables <3mm² total solution size while maintaining <20mVpp output ripple in Forced Continuous mode. | Use Scenario: Powering analog front-end circuitry in battery-operated handheld oscilloscopes requiring low-noise, low-quiescent-current supply. IC Role / Device Role / Timing Role: Low-noise 3.3V/2A supply operating in Pulse-Skipping mode to balance light-load efficiency and spectral purity. Use Value: Adjustable burst clamp and programmable soft-start suppress startup transients and EMI in sensitive measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3612EUDC#TRPBF | Same architecture and pinout; rated for –40°C to 125°C instead of –55°C to 150°C. | Not qualified for extended temperature environments; unsuitable for aerospace or under-hood use. | Select when commercial/industrial temperature range suffices and cost sensitivity outweighs extended reliability testing. |
| TPS54332DR | 3A synchronous buck from TI; 3.5V–28V input; no DDR mode; fixed 500kHz–2.5MHz frequency; 1.5% FB accuracy. | Lacks bidirectional DDR capability and extended temperature grade; higher minimum input voltage limits Li-Ion compatibility. | Choose for higher-input-voltage industrial systems where DDR termination is unnecessary and wider VIN range is required. |
Compared with LTC3612EUDC#TRPBF, the LTC3612MPUDC#TRPBF provides verified operation down to –55°C and up to 150°C with full parameter guarantees, while TPS54332DR offers broader input range but sacrifices low-VIN support, DDR functionality, and extended temperature assurance.
Availability
LTC3612MPUDC#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 extreme temperature environments.
Supply support for LTC3612MPUDC#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 qualification standards.
The LTC3612MPUDC#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, and thermally robust point-of-load conversion in space-constrained and mission-critical applications.
FAQ
What is the guaranteed operating temperature range for LTC3612MPUDC#TRPBF?
The LTC3612MPUDC#TRPBF is fully tested and guaranteed over –55°C to 150°C junction temperature. This extended range is validated per MIL-STD-883 methods and includes full electrical characterization across the span, distinguishing it from commercial-grade variants like LTC3612EUDC#TRPBF (–40°C to 125°C).
Does LTC3612MPUDC#TRPBF support DDR memory termination with bidirectional current?
Yes, LTC3612MPUDC#TRPBF supports DDR termination in dedicated DDR mode (DDR pin tied to SVIN), enabling ±1.5A sink and source capability. This is implemented via enhanced bottom-switch current limit and tracking control, allowing precise VTT regulation for DDR2/DDR3 interfaces without external components.
How does the MODE pin configure operating modes on LTC3612MPUDC#TRPBF?
The MODE pin voltage selects LTC3612MPUDC#TRPBF's operating mode: SGND enables Burst Mode with internal clamp; SVIN enables Pulse-Skipping; 1.1V to 0.58×SVIN enables Forced Continuous; and 0.45V–0.8V enables Burst Mode with external clamp. Each setting directly controls ITH comparator thresholds and sleep-state behavior.
What is the purpose of the exposed pad (Pin 21) on LTC3612MPUDC#TRPBF?
The exposed pad (Pin 21) on LTC3612MPUDC#TRPBF is PGND - the power ground connection for the internal N-channel MOSFET source. It must be soldered to a large PCB copper area to achieve the specified θJA = 43°C/W and prevent thermal shutdown during 3A continuous operation.
Can LTC3612MPUDC#TRPBF synchronize to an external clock, and what is the maximum frequency?
Yes, LTC3612MPUDC#TRPBF can synchronize to an external clock applied to the RT/SYNC pin, with supported frequency range from 300kHz to 4MHz. The internal slope compensation automatically adapts to the external clock frequency, ensuring stable current-mode operation without manual tuning.
LTC3612MPUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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-QFN (3x4)
LTC3612MPUDC#TRPBF FAQ
1.How can I place an order for LTC3612MPUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612MPUDC#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 LTC3612MPUDC#TRPBF reliable?
The price and inventory of LTC3612MPUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612MPUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612MPUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612MPUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612MPUDC#TRPBF?
LTC3612MPUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612MPUDC#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 LTC3612MPUDC#TRPBF?
For technical support, including LTC3612MPUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612MPUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3612MPUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612MPUDC#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 LTC3612MPUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612MPUDC#TRPBF?
All LTC3612MPUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612MPUDC#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 LTC3612MPUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612MPUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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