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Analog Devices Inc. LTC3616EUDD#TRPBF
- Part No.:
- LTC3616EUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616EUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3616EUDD#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 LTC3616EUDD#TRPBF datasheet, LTC3616EUDD#TRPBF pinout, LTC3616EUDD#TRPBF application, or LTC3616EUDD#TRPBF equivalent, key selection criteria include programmable switching frequency up to 4MHz, selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal AVP support, and thermal performance in the 3mm × 5mm QFN package.
Technical Context
The LTC3616EUDD#TRPBF employs constant-frequency current-mode architecture with external RT/SYNC pin control, enabling precise oscillator frequency setting from 300kHz to 4MHz via resistor or synchronization to an external clock. Its dual-MOSFET synchronous topology eliminates the need for an external catch diode.
It supports four distinct operating modes-Burst Mode (with internal or external clamp), Pulse-Skipping, and Forced Continuous-selected via the MODE pin voltage. The ITH pin provides adjustable compensation and enables Active Voltage Positioning (AVP) when tied to SVIN, optimizing transient response across load and capacitor variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous - supports high-current point-of-load regulation for processors and DDR memory rails. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion and fixed low-voltage supplies. |
| Switching Frequency | Up to 4MHz - enables use of sub-μH inductors and compact ceramic output capacitors. |
| Quiescent Current | 75µA in Burst Mode - extends battery life in always-on portable systems. |
| Output Accuracy | ±1% over temperature - ensures stable core voltage for sensitive digital loads. |
| Duty Cycle | 100% - maintains regulation during deep battery discharge down to VOUT + RDS(ON) × IOUT. |
| Package | 24-pin 3mm × 5mm QFN with exposed PGND pad - provides low thermal resistance (θJA = 38°C/W). |
Pinout & Package
Package: 24-lead (3mm × 5mm) plastic QFN with exposed thermal pad (Pin 25 = PGND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Slew rate limit / DDR mode select | Tied to SVIN enables DDR termination mode; resistor-to-GND adjusts slew rate for EMI control. |
| RT/SYNC (2) | Oscillator frequency control | Resistor sets fSW (300kHz–4MHz); external clock synchronizes switching to reduce beat frequencies. |
| SGND (3) | Signal ground reference | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point. |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent input for top P-channel switch; may be lower than SVIN to reduce gate drive loss. |
| SW (5,6,7,8,13,14,15,16) | Switch node | Eight paralleled pins reduce inductance and resistive loss at high peak currents (≥12A). |
| RUN (19) | Enable control | Logic-high enables regulation; pulled low disables IC with <1µA shutdown current. |
| PGOOD (20) | Open-drain power-good indicator | Asserts after VFB remains within ±7.5% window for >100µs; actively pulls down in shutdown. |
| MODE (21) | Operating mode selector | Voltage level selects Burst Mode (0V), Pulse-Skipping (SVIN), or Forced Continuous (1.1V–0.58×SVIN). |
| VFB (22) | Feedback input | Monitors resistive divider; internal 0.6V reference enables output as low as 0.6V. |
| ITH (23) | Error amplifier output / compensation | Adjustable compensation node; tie to SVIN for internal AVP and simplified loop design. |
| TRACK/SS (24) | Soft-start / tracking / external reference | Enables internal soft-start (tie to SVIN), external timing (RC), or supply tracking for rail sequencing. |
| PGND (25) | Power ground | Exposed pad; connects to source of bottom N-channel MOSFET and must be thermally anchored. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable slew rate on SW node | Reduces EMI by limiting dV/dt during switching transitions without sacrificing efficiency. |
| Selectable operating modes | Enables optimization between light-load efficiency (Burst Mode), low-noise performance (Forced Continuous), and ripple trade-offs (Pulse-Skipping). |
| Active Voltage Positioning (AVP) | Internal compensation via ITH-to-SVIN connection improves load transient response for CPU/GPU rails with dynamic current demands. |
| DDR memory termination support | SRLIM/DDR pin tied to SVIN configures bidirectional ±3A current sourcing/sinking for DDR2/DDR3 VTT rails. |
| 100% duty cycle operation | Maintains regulation under low-input conditions (e.g., Li-ion discharge to 2.5V) without dropout-induced system reset. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
|
Use Scenario: Regulating core voltage for ARM-based SoCs in handheld devices with tight space constraints and battery-life requirements. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/6A with fast transient response and low quiescent current. Use Value: 95% peak efficiency and 75µA sleep current extend runtime; 4MHz operation allows 220nH inductor and minimal footprint. |
Use Scenario: Providing bidirectional ±3A termination for DDR3 memory interfaces in laptops and embedded controllers. IC Role / Device Role / Timing Role: DDR mode-configured synchronous buck delivering matched sourcing/sinking current with controlled slew rate. Use Value: Eliminates discrete termination networks; SRLIM/DDR pin enables EMI-optimized edge control during data transitions. |
| Portable Computer Systems | Distributed Power Supplies |
|
Use Scenario: Generating multiple low-voltage rails (e.g., 1.8V, 1.2V, 0.9V) from a shared 3.3V or 5V intermediate bus in ultrabooks. IC Role / Device Role / Timing Role: High-density, thermally efficient step-down converter supporting rail sequencing via TRACK/SS pin. Use Value: Internal soft-start and tracking capability ensure controlled power-up sequence; QFN package enables double-sided PCB layout. |
Use Scenario: Local regulation at remote subsystems (e.g., FPGA I/O banks, sensor clusters) in industrial IoT gateways. IC Role / Device Role / Timing Role: Isolated point-of-load converter with robust input range (2.25V–5.5V) and fault tolerance. Use Value: Undervoltage lockout (1.7V) and overtemperature protection prevent brownout failures; PGND-exposed pad sustains 150°C junction temp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546D24A | 6A, 2.95–16V input, 3.3MHz max, integrated PMBus telemetry; larger 5mm × 5mm QFN-32 package. | Targeted at digitally managed systems requiring voltage margining and fault logging; lacks native DDR mode. | Choose for systems needing digital monitoring; avoid if analog-only control and DDR termination are required. |
| MPQ4420AGL-A | 2A rated (derated to ~3.5A continuous), 3.3–36V input, 2MHz max, no DDR mode or AVP; 3mm × 4mm QFN-12. | Cost-optimized for mid-power industrial rails; insufficient current headroom for full 6A loads. | Choose only for ≤3.5A applications where cost and size outweigh performance needs; verify thermal derating. |
Compared with TPS546D24A and MPQ4420AGL-A, the LTC3616EUDD#TRPBF uniquely combines 6A output, DDR termination capability, AVP support, and ultra-low 75µA quiescent current in a compact 3mm × 5mm footprint-making it optimal for battery-powered, high-performance memory and processor rails.
Availability
LTC3616EUDD#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3616EUDD#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3616EUDD#TRPBF belongs to Linear's high-efficiency monolithic buck regulator family, designed specifically for space-constrained, battery-sensitive applications demanding low IQ, wide VIN range, and advanced mode flexibility.
FAQ
What is the maximum supported switching frequency for the LTC3616EUDD#TRPBF?
The LTC3616EUDD#TRPBF supports a maximum switching frequency of 4MHz, either through an external resistor on the RT/SYNC pin or via synchronization to an external clock signal. At 4MHz, the device enables use of very small inductors (e.g., 220nH) and low-ESR ceramic capacitors while maintaining stable current-mode control and low output ripple in Forced Continuous mode.
Does the LTC3616EUDD#TRPBF support DDR memory termination?
Yes, the LTC3616EUDD#TRPBF supports DDR memory termination when the SRLIM/DDR pin is tied to SVIN. In this configuration, it delivers ±3A sourcing/sinking capability with programmable slew rate control, meeting DDR2/DDR3 VTT rail requirements. The device maintains tight output regulation and fast transient response without requiring external current-sense resistors or discrete termination components.
How does the MODE pin configure operating modes on the LTC3616EUDD#TRPBF?
The MODE pin on the LTC3616EUDD#TRPBF selects operating mode via applied voltage: 0V enables Burst Mode with internal clamp; SVIN enables Pulse-Skipping; 1.1V to 0.58×SVIN enables Forced Continuous mode. External voltages between 0.45V and 0.8V enable Burst Mode with user-defined clamp threshold, allowing precise trade-off between light-load efficiency and output ripple.
What thermal considerations apply to the LTC3616EUDD#TRPBF in high-current operation?
The LTC3616EUDD#TRPBF uses a 24-pin 3mm × 5mm QFN with exposed PGND pad (θJA = 38°C/W). For 6A operation at high ambient temperatures, the exposed pad must be soldered to a minimum 200mm² copper pour with ≥4 thermal vias to internal ground planes. Junction temperature must remain ≤150°C; derating is required above 125°C per Analog Devices' reliability guidelines.
Can the LTC3616EUDD#TRPBF operate with a 2.25V input supply?
Yes, the LTC3616EUDD#TRPBF operates down to 2.25V input, enabling compatibility with deeply discharged Li-ion cells. At low VIN, RDS(ON) increases slightly, so thermal design must account for higher conduction losses-especially near 100% duty cycle. Efficiency remains >85% at 2.5V input/1.8V output/2A load in Burst Mode, as verified in typical performance graphs.
LTC3616EUDD#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)
LTC3616EUDD#TRPBF FAQ
1.How can I place an order for LTC3616EUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616EUDD#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 LTC3616EUDD#TRPBF reliable?
The price and inventory of LTC3616EUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616EUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3616EUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616EUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616EUDD#TRPBF?
LTC3616EUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616EUDD#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 LTC3616EUDD#TRPBF?
For technical support, including LTC3616EUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616EUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3616EUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3616EUDD#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 LTC3616EUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3616EUDD#TRPBF?
All LTC3616EUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616EUDD#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 LTC3616EUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3616EUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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