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Analog Devices Inc. LTC3616MPUDD#TRPBF
- Part No.:
- LTC3616MPUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616MPUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
LTC3616MPUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 6A, 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 delivers high efficiency (up to 95%) in portable computing and DDR memory termination applications.
For engineers reviewing the LTC3616MPUDD#TRPBF datasheet, LTC3616MPUDD#TRPBF pinout, LTC3616MPUDD#TRPBF application, or LTC3616MPUDD#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, programmable slew rate on SW node, selectable Burst/Pulse-Skipping/Forced Continuous modes, and internal AVP support for dynamic load regulation.
Technical Context
The LTC3616MPUDD#TRPBF implements constant-frequency current-mode control with an internal 2.25MHz oscillator (externally adjustable up to 4MHz via RT/SYNC resistor or external clock), enabling precise transient response tuning across wide load and output capacitor ranges. Its dual MOSFET power stage features 35mΩ top and 25mΩ bottom switch RDS(ON) at 3.3V PVIN, supporting high-efficiency operation down to 0.6V output.
It integrates four operating modes-Burst Mode (75µA IQ), Pulse-Skipping, Forced Continuous, and DDR mode-with MODE pin voltage selection and supports active voltage positioning (AVP) when ITH is tied to SVIN. The device includes comprehensive protection: overcurrent foldback, short-circuit valley-current limiting, thermal shutdown, and PGOOD monitoring with 70–140µs blanking time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous; supports ±3A bidirectional current in DDR mode for memory termination compliance. |
| Input Voltage Range | 2.25V to 5.5V; enables single Li-Ion battery operation and fixed low-voltage rail compatibility. |
| Output Voltage Accuracy | ±1% over –55°C to 150°C; ensures stable regulation under extreme industrial and automotive ambient conditions. |
| Quiescent Current | 75µA in Burst Mode sleep; extends battery life in always-on portable systems without sacrificing regulation. |
| Switching Frequency | Programmable 0.3–4MHz; allows optimization of inductor size (e.g., 220nH at 4MHz) vs. EMI/efficiency trade-offs. |
| Feedback Reference | 0.589V to 0.609V (–55°C to 150°C); tightly specified internal reference enables accurate 0.6V–5.5V output programming. |
| Thermal Rating | Junction temperature range –55°C to 150°C; qualified for harsh-environment applications including avionics and downhole electronics. |
Pinout & Package
The LTC3616MPUDD#TRPBF is housed in a thermally enhanced 24-pin 3mm × 5mm QFN package (UDD) with exposed PGND pad (Pin 25) requiring PCB soldering for optimal thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Slew rate limit / DDR mode enable | Tying to SVIN activates DDR termination mode; resistor-to-ground adjusts SW node slew rate to reduce EMI. |
| RT/SYNC (2) | Oscillator frequency control / sync input | Resistor sets fSW (0.3–4MHz); external clock synchronizes switching to avoid beat frequencies in noise-sensitive systems. |
| SGND (3) | Signal ground reference | Reference point for feedback, compensation, and control circuitry; must be star-connected to PGND to minimize noise coupling. |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent input for high-side P-MOSFET; may be lower than SVIN to reduce gate drive losses in low-VIN operation. |
| SW (5,6,7,8,13,14,15,16) | Switch node connection | Eight paralleled pins reduce parasitic inductance and thermal resistance for 6A peak currents and fast switching transitions. |
| RUN (19) | Enable/shutdown control | Logic-high enables regulation; grounding shuts down device, reducing supply current to <1µA for zero-power standby. |
| PGOOD (20) | Power-good status indicator | Open-drain output asserts low if VFB deviates >±7.5% from setpoint; 70–140µs blanking prevents false triggering during transients. |
| MODE (21) | Operating mode selection | Voltage level selects Burst Mode (0V), Pulse-Skipping (SVIN), Forced Continuous (1.1V–0.58×SVIN), or external-clamp Burst (0.45–0.8V). |
| VFB (22) | Feedback voltage input | Monitors resistive divider output; internal 0.6V reference enables precise output programming with minimal external components. |
| ITH (23) | Error amplifier compensation node | Adjusts current comparator threshold; tying to SVIN enables internal compensation and AVP for improved load-step response. |
| TRACK/SS (24) | Soft-start / tracking / external reference | Enables internal soft-start (tSS = 0.65–1.9ms), output voltage tracking, or external reference input for multi-rail sequencing. |
| PGND (25) | Power ground return | Exposed pad connects to N-MOSFET source and output capacitor negative terminal; mandatory thermal and electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable slew rate on SW node | Reduces EMI emissions and voltage overshoot by controlling dV/dt during switching transitions without external snubbers. |
| Selectable operating modes | Burst Mode (75µA IQ), Pulse-Skipping, Forced Continuous, and DDR mode provide optimal efficiency/noise/regulation trade-offs per application. |
| Internal Active Voltage Positioning (AVP) | When ITH tied to SVIN, dynamically lowers output voltage under heavy load to maintain tight regulation and reduce IR drop in long PCB traces. |
| 100% duty cycle low-dropout operation | Extends runtime in battery-powered systems by maintaining regulation as input voltage decays near output voltage level. |
| DDR memory termination support | IOUT = ±3A capability with SRLIM/DDR pin activation meets JEDEC DDR3/DDR4 termination requirements for bidirectional current sourcing/sinking. |
Applications
| Point-of-Load Regulation | Distributed Power Systems |
|---|---|
|
Use Scenario: Local DC/DC conversion for FPGA core voltage (e.g., 1.2V @ 6A) on dense PCBs with limited board space. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated output with fast transient response and low output ripple. Use Value: 4MHz switching enables use of ultra-small 220nH inductors; 3mm × 5mm QFN minimizes footprint while maintaining thermal performance. |
Use Scenario: Secondary regulation stage in telecom base station power architecture feeding multiple sub-systems. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 5V/3.3V to 1.8V/1.5V rails with precise sequencing. Use Value: TRACK/SS pin enables voltage ramp coordination with upstream supplies; PGOOD provides system-level power sequencing feedback. |
| Portable Computing | DDR Memory Termination |
|
Use Scenario: Main processor core supply in ultrabooks and tablets powered by single-cell Li-Ion (2.7–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator with low quiescent current and 100% duty cycle for maximum battery runtime. Use Value: 75µA Burst Mode IQ extends standby time; wide 2.25–5.5V input accommodates full battery discharge curve. |
Use Scenario: VTT termination supply for DDR3/DDR4 memory modules requiring ±3A bidirectional current capability. IC Role / Device Role / Timing Role: DDR-optimized buck converter with SRLIM/DDR pin activation and forced continuous mode for low-noise termination. Use Value: ±3A sourcing/sinking current meets JEDEC VTT spec; internal AVP maintains tight VTT regulation under dynamic memory access loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54620RGYT | 6A, 2.2–17V input, 3.5MHz max fSW, 1.5% VOUT accuracy, –40°C to 125°C grade | Lacks DDR mode, AVP, and –55°C rating; higher input voltage range suits industrial 12V rails | Choose for cost-sensitive industrial designs where extended temp range and DDR support are not required. |
| ISL85415IRZ-T7A | 6A, 3–40V input, 2.1MHz fSW, ±1.5% VOUT accuracy, –40°C to 125°C grade | Higher minimum input voltage (3V) excludes single Li-Ion use; no DDR mode or programmable slew rate | Prefer for high-input-voltage applications like automotive body electronics where 2.25V start-up is unnecessary. |
Compared with TPS54620RGYT and ISL85415IRZ-T7A, the LTC3616MPUDD#TRPBF offers superior low-temperature operation (–55°C), integrated DDR termination, and finer control over EMI via slew-rate programming-critical for portable and memory-intensive systems.
Availability
LTC3616MPUDD#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computing applications requiring stable component supply across extended temperature ranges.
Supply support for LTC3616MPUDD#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 continues its legacy of high-performance analog and power management ICs for precision, reliability, and ruggedness-critical applications.
The LTC3616MPUDD#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, engineered for high-efficiency, low-noise, and extended-temperature DC/DC conversion in portable, computing, and memory subsystems.
FAQ
What is the operating temperature range of the LTC3616MPUDD#TRPBF?
The LTC3616MPUDD#TRPBF is rated for a junction temperature range of –55°C to 150°C, making it suitable for extreme-environment applications such as avionics, downhole tools, and military-grade electronics. This extended grade is confirmed in the order information table and validated across all electrical characteristics in the datasheet.
Does the LTC3616MPUDD#TRPBF support DDR memory termination?
Yes, the LTC3616MPUDD#TRPBF supports DDR memory termination via its SRLIM/DDR pin: tying this pin to SVIN activates DDR mode, enabling ±3A bidirectional output current capability and optimized timing for JEDEC-compliant VTT rails. This functionality is explicitly documented in the Features and Pin Functions sections.
How is the switching frequency programmed on the LTC3616MPUDD#TRPBF?
The LTC3616MPUDD#TRPBF supports three frequency configuration methods: (1) resistor from RT/SYNC to GND (0.3–4MHz), (2) external clock signal applied to RT/SYNC (up to 4MHz), or (3) tying RT/SYNC to SVIN for internal 2.25MHz operation. All methods are detailed in the Pin Functions and Electrical Characteristics tables.
What are the key differences between Burst Mode and Forced Continuous Mode on the LTC3616MPUDD#TRPBF?
Burst Mode reduces quiescent current to 75µA at light loads by intermittently disabling switching and internal circuits, improving efficiency but increasing output ripple. Forced Continuous Mode maintains constant switching, minimizing ripple and EMI but drawing higher IQ; it is required for bidirectional current (DDR) and noise-sensitive signal chains. Mode selection is controlled by the MODE pin voltage.
Can the LTC3616MPUDD#TRPBF operate with a 2.25V input supply?
Yes, the LTC3616MPUDD#TRPBF guarantees operation down to 2.25V input across its full –55°C to 150°C temperature range, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This enables reliable start-up and regulation from deeply discharged single-cell Li-Ion batteries.
LTC3616MPUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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:
- 6A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LTC3616MPUDD#TRPBF FAQ
1.How can I place an order for LTC3616MPUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616MPUDD#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 LTC3616MPUDD#TRPBF reliable?
The price and inventory of LTC3616MPUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616MPUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3616MPUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616MPUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616MPUDD#TRPBF?
LTC3616MPUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616MPUDD#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 LTC3616MPUDD#TRPBF?
For technical support, including LTC3616MPUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616MPUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3616MPUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3616MPUDD#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 LTC3616MPUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3616MPUDD#TRPBF?
All LTC3616MPUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616MPUDD#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 LTC3616MPUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3616MPUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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