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Analog Devices Inc. LTC3616HUDD#TRPBF
- Part No.:
- LTC3616HUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616HUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
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Product details
Overview
LTC3616HUDD#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 LTC3616HUDD#TRPBF datasheet, LTC3616HUDD#TRPBF pinout, LTC3616HUDD#TRPBF application, or LTC3616HUDD#TRPBF equivalent, key selection criteria include programmable switching frequency up to 4MHz, selectable Burst Mode®/pulse-skipping/forced continuous operation, internal AVP support, adjustable soft-start, and thermal grade rated for –40°C to 150°C junction operation.
Technical Context
The LTC3616HUDD#TRPBF implements constant-frequency current-mode control with external RT/SYNC programmability (300kHz–4MHz) or synchronization to an external clock. Its dual MOSFET architecture features 35mΩ top (P-channel) and 25mΩ bottom (N-channel) switches, enabling high-efficiency regulation down to 0.6V output with ±1% accuracy over temperature.
It supports four operating modes via the MODE pin: Burst Mode® (75µA IQ), pulse-skipping, forced continuous (reduced EMI), and DDR mode (±3A sink/source). Internal compensation and active voltage positioning (AVP) are enabled by tying ITH to SVIN, while TRACK/SS enables start-up tracking or external reference input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous; supports ±3A bidirectional current in DDR mode for memory termination. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion and fixed low-voltage rails. |
| Output Voltage Accuracy | ±1% over –40°C to 150°C; ensures stable regulation under thermal stress in industrial environments. |
| Quiescent Current | 75µA in Burst Mode® at no load; extends battery life in handheld devices. |
| Switching Frequency | Programmable up to 4MHz; enables use of compact 220nH inductors and reduces solution footprint. |
| Duty Cycle | 100% capability; maintains regulation during brownout or battery discharge down to VOUT + RDS(ON) × IOUT. |
| Thermal Rating | Junction temperature range –40°C to 150°C; qualified for high-reliability automotive and industrial applications. |
Pinout & Package
The LTC3616HUDD#TRPBF is housed in a thermally enhanced 24-pin 3mm × 5mm QFN package with exposed PGND pad (Pin 25), requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew rate control | Tied to SVIN enables DDR mode; resistor-to-ground adjusts slew rate; open = minimum slew. |
| RT/SYNC (2) | Oscillator timing & sync interface | Resistor sets frequency (300kHz–4MHz); external clock synchronizes switching; tied to SVIN = 2.25MHz internal oscillator. |
| SGND (3) | Signal ground reference | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point. |
| PVIN (4,10,11,17) | Main power switch supply | Connects to source of internal P-MOSFET; may be lower than SVIN to reduce gate drive loss. |
| SW (5,6,7,8,13,14,15,16) | Switch node | Eight paralleled pins connect to inductor; minimize trace inductance and thermal resistance. |
| RUN (19) | Enable/shutdown control | Pull low to disable; draws <1µA in shutdown; supports sequencing with external logic. |
| PGOOD (20) | Power-good status indicator | Open-drain output asserts after 100µs in regulation window (±7.5%); actively pulls down in shutdown. |
| MODE (21) | Operating mode selector | Voltage levels select Burst Mode® (0V), pulse-skipping (SVIN), forced continuous (1.1V–0.58×SVIN), or external-clamp Burst. |
| VFB (22) | Feedback input | Monitors resistive divider; internal 0.6V reference enables outputs down to 0.6V with ±1% accuracy. |
| ITH (23) | Error amplifier compensation | Controls peak inductor current; tie to SVIN for internal compensation and AVP support. |
| TRACK/SS (24) | Soft-start & tracking input | Enables internal soft-start (tSS = 0.65–1.9ms), external capacitor timing, or supply tracking. |
| PGND (25) | Power ground return | Exposed pad connects to source of N-MOSFET; must be soldered to large copper area for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable slew rate on SW node | Reduces EMI and voltage overshoot during transient load steps via SRLIM/DDR pin adjustment. |
| Selectable operating modes | Burst Mode® (75µA IQ), pulse-skipping, forced continuous (low-noise), and DDR mode (±3A sink/source) via MODE pin voltage. |
| Active Voltage Positioning (AVP) | Internal compensation enabled by tying ITH to SVIN; optimizes transient response for CPU/GPU VRMs. |
| 100% duty cycle operation | Maintains regulation during input voltage collapse-critical for battery-powered systems nearing end-of-discharge. |
| Adjustable soft-start | Configurable via TRACK/SS pin (internal or external RC) to prevent inrush current and ensure controlled power-up sequencing. |
| DDR memory termination support | Integrated ±3A sink/source capability with dedicated DDR mode; eliminates need for external termination ICs. |
Applications
| Point-of-Load Supplies | Distributed Power Supplies |
|---|---|
Use Scenario: Local regulation for FPGA core voltage (1.0V/6A) in telecom base station backplane. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise power directly at the load. Use Value: 95% peak efficiency and forced continuous mode suppress switching harmonics near sensitive RF sections. |
Use Scenario: Secondary rail generation (3.3V/4A) from 48V intermediate bus in industrial PLC rack. IC Role / Device Role / Timing Role: High-current step-down converter with 100% duty cycle for brownout resilience during line dips. Use Value: 2.25V–5.5V input range accommodates wide-output intermediate bus; thermal grade supports 85°C ambient operation. |
| Portable Computer Systems | DDR Memory Termination |
Use Scenario: Core voltage supply (1.2V/6A) for mobile SoC in ultrabook platform. IC Role / Device Role / Timing Role: Main processor power delivery IC with dynamic mode switching between Burst Mode® (idle) and forced continuous (active). Use Value: 75µA quiescent current in Burst Mode® extends battery runtime; programmable soft-start prevents system reset during wake-up. |
Use Scenario: DDR3/DDR4 VTT termination (1.5V/±3A) in notebook memory subsystem. IC Role / Device Role / Timing Role: Bidirectional synchronous buck operating in DDR mode to source/sink current during memory read/write cycles. Use Value: Integrated ±3A capability eliminates discrete termination FETs and reduces BOM count; AVP improves transient response to memory burst 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 |
|---|---|---|---|
| TPS546D24RQFT | 6A, 2.2V–18V input, integrated FETs, PMBus interface; higher VIN range but larger 5mm × 5.5mm QFN. | Requires digital control infrastructure; suited for server VRMs needing telemetry and margining. | Choose TPS546D24RQFT when digital monitoring, wider input range, or multi-rail coordination is required. |
| MP2315GJ-Z | 6A, 4.5V–28V input, 500kHz–2.2MHz programmable frequency; no DDR mode or AVP; 17-pin QFN. | Lacks bidirectional current support and advanced light-load modes; optimized for cost-sensitive industrial supplies. | Choose MP2315GJ-Z for fixed-input industrial rails where DDR termination and ultra-low IQ are not needed. |
Compared with TPS546D24RQFT and MP2315GJ-Z, the LTC3616HUDD#TRPBF offers superior light-load efficiency via Burst Mode®, integrated DDR termination, and a compact 3mm × 5mm footprint-making it optimal for space-constrained, battery-aware, and memory-intensive designs.
Availability
LTC3616HUDD#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load supplies requiring stable component supply across extended temperature ranges.
Supply support for LTC3616HUDD#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 precision analog and power management portfolio. Linear's legacy includes high-performance DC/DC regulators known for robustness and low-noise operation.
The LTC3616HUDD#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-current, low-voltage point-of-load applications in portable, computing, and memory subsystems where efficiency, thermal resilience, and compact layout are critical.
FAQ
What is the maximum junction temperature rating for the LTC3616HUDD#TRPBF?
The LTC3616HUDD#TRPBF is rated for operation up to 150°C junction temperature, distinguishing it from the E-grade (125°C) and I-grade (125°C) variants. This H-grade qualification supports deployment in high-ambient environments such as enclosed industrial enclosures or under-chassis automotive modules where thermal headroom is constrained.
How does the LTC3616HUDD#TRPBF achieve 100% duty cycle operation?
The LTC3616HUDD#TRPBF achieves 100% duty cycle by holding the internal P-channel MOSFET continuously on when input voltage approaches output voltage. This allows regulation down to VOUT = VIN − (RDS(ON)_P × IOUT), extending operational time in battery-powered systems during deep discharge without requiring external components.
Can the LTC3616HUDD#TRPBF be used for DDR memory VTT termination?
Yes-the LTC3616HUDD#TRPBF supports DDR mode when SRLIM/DDR is tied to SVIN, enabling ±3A bidirectional current delivery. It regulates VTT to half the supply voltage (e.g., 1.5V for DDR3) with fast transient response, eliminating the need for external termination FETs and simplifying layout in memory subsystems.
What is the purpose of the TRACK/SS pin on the LTC3616HUDD#TRPBF?
The TRACK/SS pin on the LTC3616HUDD#TRPBF serves three functions: enabling internal soft-start (0.65–1.9ms), configuring external RC soft-start timing, or forcing output voltage tracking of another supply during power-up. It ensures controlled sequencing and prevents inrush current in multi-rail systems.
Does the LTC3616HUDD#TRPBF require external compensation components?
The LTC3616HUDD#TRPBF supports both external and internal compensation. Tying the ITH pin to SVIN activates internal compensation and AVP mode-ideal for standard loads. For custom transient response optimization across varying output capacitors and loads, external compensation via ITH is fully supported and documented in the datasheet.
LTC3616HUDD#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)
LTC3616HUDD#TRPBF FAQ
1.How can I place an order for LTC3616HUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616HUDD#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 LTC3616HUDD#TRPBF reliable?
The price and inventory of LTC3616HUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616HUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3616HUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616HUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616HUDD#TRPBF?
LTC3616HUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616HUDD#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 LTC3616HUDD#TRPBF?
For technical support, including LTC3616HUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616HUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3616HUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3616HUDD#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 LTC3616HUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3616HUDD#TRPBF?
All LTC3616HUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616HUDD#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 LTC3616HUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3616HUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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