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Analog Devices Inc. LTC3616IUDD#TRPBF
- Part No.:
- LTC3616IUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616IUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,820
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Product details
Overview
LTC3616IUDD#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 where compact size and battery runtime are critical.
For engineers reviewing the LTC3616IUDD#TRPBF datasheet, LTC3616IUDD#TRPBF pinout, LTC3616IUDD#TRPBF application, or LTC3616IUDD#TRPBF equivalent, key selection criteria include its programmable switching frequency (300kHz–4MHz), selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal AVP support, 75µA sleep-mode quiescent current, and thermally enhanced 24-pin 3mm × 5mm QFN package.
Technical Context
The LTC3616IUDD#TRPBF employs constant-frequency current-mode architecture with external RT/SYNC pin control for oscillator frequency setting, synchronization up to 4MHz, or internal 2.25MHz default. Its dual MOSFET power stage features 35mΩ P-channel top switch and 25mΩ N-channel bottom switch, enabling high-efficiency regulation down to 0.6V output with adjustable compensation via ITH pin.
Four distinct operating modes-Burst Mode (with internal or external clamp), Pulse-Skipping, and Forced Continuous-are selected via the MODE pin voltage. DDR memory mode is enabled by tying SRLIM/DDR to SVIN, supporting ±3A sink/source capability and dynamic tracking via TRACK/SS pin for coordinated multi-rail sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous; supports DDR termination with ±3A sink/source capability in DDR mode. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion and fixed low-voltage rails. |
| Output Voltage Accuracy | ±1% over temperature; enables precise regulation for core logic and memory supplies. |
| Switching Frequency | Programmable 300kHz–4MHz; allows optimization of inductor size vs. efficiency and EMI. |
| Quiescent Current | 75µA in Burst Mode sleep; extends battery life in always-on portable systems. |
| Package Thermal Resistance | θJA = 38°C/W; exposed PGND pad requires PCB soldering for thermal performance. |
| Duty Cycle Capability | 100%; maintains regulation during brownout or low-input conditions without dropout. |
Pinout & Package
The LTC3616IUDD#TRPBF is housed in a 24-pin, 3mm × 5mm thermally enhanced QFN package (UDD) with exposed PGND pad (Pin 25) requiring PCB soldering 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-GND adjusts slew rate; open = min slew. |
| RT/SYNC (2) | Oscillator timing & sync interface | Resistor sets frequency (300kHz–4MHz); external clock synchronizes up to 4MHz. |
| SGND (3) | Signal reference ground | Reference for feedback, compensation, and small-signal circuitry; connects to PGND at single point. |
| PVIN (4,10,11,17) | Main power input for top switch | Independent of SVIN; may be lower than SVIN to reduce gate drive losses. |
| SW (5,6,7,8,13,14,15,16) | Power switch node | Connects to inductor; multiple pins reduce parasitic inductance and improve thermal spreading. |
| RUN (19) | Enable/shutdown control | Pull low to disable; draws <1µA in shutdown; supports controlled power sequencing. |
| PGOOD (20) | Open-drain status indicator | Pulled low if VFB outside ±7.5% window; actively discharges output during shutdown. |
| MODE (21) | Operating mode selection | Voltage-selectable: SGND = Burst Mode; SVIN = Pulse-Skipping; 1.1V–0.58×SVIN = Forced Continuous. |
| VFB (22) | Feedback voltage input | Monitors resistive divider; references 0.6V internal bandgap; ±1% accuracy ensures tight regulation. |
| ITH (23) | Error amplifier compensation node | Adjusts peak inductor current threshold; tie to SVIN for internal compensation + AVP. |
| TRACK/SS (24) | Soft-start, tracking, or external reference | Enables internal soft-start (to SVIN), external RC timing, or supply tracking for rail coordination. |
| PGND (25) | Power ground return | Exposed pad; must be soldered to PCB plane for thermal management and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable slew rate on SW node | Reduces EMI and voltage overshoot during transient load steps via SRLIM/DDR pin. |
| Selectable operating modes | Burst Mode (75µA IQ), Pulse-Skipping, or Forced Continuous-optimized for efficiency vs. noise requirements. |
| Active Voltage Positioning (AVP) | Internal compensation enabled by tying ITH to SVIN; improves transient response under varying loads. |
| DDR memory termination support | ±3A sink/source capability with tracking and fast transient response for DDR2/DDR3/DDR4 VTT rails. |
| 100% duty cycle low-dropout operation | Maintains regulation as VIN approaches VOUT; extends usable battery voltage range in portable systems. |
| External synchronization up to 4MHz | Eliminates beat frequencies in multi-converter systems; enables deterministic EMI filtering. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
|
Use Scenario: Regulating core voltage for FPGA, ASIC, or microprocessor in space-constrained embedded systems. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 0.6V–3.3V at up to 6A with fast transient response. Use Value: High efficiency (95%) and 100% duty cycle extend runtime; programmable frequency enables compact 220nH inductor use. |
Use Scenario: Providing matched ±3A sink/source VTT termination for DDR2/DDR3 memory interfaces. IC Role / Device Role / Timing Role: DDR mode-enabled buck converter with TRACK/SS-controlled ramp alignment to main VDDQ rail. Use Value: Eliminates need for discrete termination resistors and external op-amps; reduces BOM count and board area. |
| Portable Computer Power | Distributed Power Architecture |
|
Use Scenario: Main system rail conversion in ultrabooks and tablets powered by single-cell Li-Ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating across full battery discharge curve (4.2V → 2.8V). Use Value: 75µA Burst Mode IQ preserves standby time; low RDS(ON) switches minimize conduction loss at light loads. |
Use Scenario: Local regulation at remote subsystems in industrial controllers or telecom line cards. IC Role / Device Role / Timing Role: Isolated point-of-load converter synchronized to system clock via RT/SYNC pin. Use Value: Synchronization eliminates inter-rail beat frequencies; QFN package simplifies thermal design in dense layouts. |
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, 2.95–17V input, fixed 600kHz–1.8MHz freq; no DDR mode or AVP; 12µA IQ in Eco-mode. | Wider input range suits 12V intermediate bus; lacks DDR tracking and programmable slew rate. | Choose for higher-input distributed systems where DDR support is unnecessary. |
| MP2315GJ-Z | 6A, 4.5–28V input, 500kHz–2MHz freq; no Burst Mode; 300µA IQ; no DDR or AVP support. | Targeted at industrial 24V rails; higher minimum input limits use in Li-Ion systems. | Prefer when cost sensitivity outweighs ultra-low IQ and advanced mode flexibility. |
Compared with TPS54620RGYT and MP2315GJ-Z, the LTC3616IUDD#TRPBF offers superior light-load efficiency via Burst Mode, integrated DDR functionality, and finer-grained control over transient response through ITH-based compensation-making it optimal for portable and memory-intensive designs.
Availability
LTC3616IUDD#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, portable computer power, and distributed power architecture applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LTC3616IUDD#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 with rigorous reliability testing and automotive-grade process controls.
The LTC3616IUDD#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-current, low-voltage point-of-load and DDR memory applications demanding precision, efficiency, and thermal robustness.
FAQ
What is the operating temperature range for the LTC3616IUDD#TRPBF?
The LTC3616IUDD#TRPBF is rated for –40°C to 125°C junction temperature and is specified and tested across this full industrial range. Its UDD package features an exposed PGND pad that must be soldered to the PCB for effective thermal dissipation and reliable operation at maximum load.
How does the LTC3616IUDD#TRPBF achieve 100% duty cycle operation?
The LTC3616IUDD#TRPBF achieves 100% duty cycle by holding the internal P-channel top switch continuously on when input voltage approaches output voltage. This low-dropout behavior maintains regulation without external components, extending usable battery life in portable systems powered by single Li-Ion cells.
Can the LTC3616IUDD#TRPBF be used for DDR memory termination?
Yes-the LTC3616IUDD#TRPBF supports DDR memory termination in dedicated DDR mode (SRLIM/DDR tied to SVIN), delivering ±3A sink/source capability with TRACK/SS-controlled ramp alignment and fast transient response required for DDR2/DDR3/DDR4 VTT rails.
What is the purpose of the ITH pin on the LTC3616IUDD#TRPBF?
The ITH pin on the LTC3616IUDD#TRPBF serves as the error amplifier output and current comparator threshold control. It enables external compensation network design or internal AVP mode (when tied to SVIN), directly influencing transient response, stability, and load-step performance across wide output capacitor ranges.
How is switching frequency programmed on the LTC3616IUDD#TRPBF?
Switching frequency on the LTC3616IUDD#TRPBF is programmed via the RT/SYNC pin: connecting a resistor to ground sets frequency from 300kHz to 4MHz; applying an external clock synchronizes operation up to 4MHz; tying to SVIN selects the internal 2.25MHz oscillator.
LTC3616IUDD#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)
LTC3616IUDD#TRPBF FAQ
1.How can I place an order for LTC3616IUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616IUDD#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 LTC3616IUDD#TRPBF reliable?
The price and inventory of LTC3616IUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616IUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3616IUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616IUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616IUDD#TRPBF?
LTC3616IUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616IUDD#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 LTC3616IUDD#TRPBF?
For technical support, including LTC3616IUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616IUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3616IUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3616IUDD#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 LTC3616IUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3616IUDD#TRPBF?
All LTC3616IUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616IUDD#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 LTC3616IUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3616IUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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