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Analog Devices Inc. LTC3616HUDD#PBF
- Part No.:
- LTC3616HUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616HUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,819
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Product details
Overview
LTC3616HUDD#PBF 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#PBF datasheet, LTC3616HUDD#PBF pinout, LTC3616HUDD#PBF application, or LTC3616HUDD#PBF equivalent, key selection criteria include its programmable switching frequency (up to 4MHz), selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal AVP support, 75µA sleep-mode quiescent current, and thermal-enhanced 24-pin 3mm × 5mm QFN package rated for –40°C to 150°C junction temperature.
Technical Context
The LTC3616HUDD#PBF implements constant-frequency current-mode control with adjustable slope compensation and dual MOSFET drivers (P-channel high-side, N-channel synchronous low-side). Its error amplifier transconductance is 200µS, and ITH pin voltage range (0.1V–1.05V) directly sets peak inductor current, enabling precise transient response tuning across load and output capacitor variations.
It supports three frequency-setting methods: external RT resistor (300kHz–4MHz), synchronization to external clock (0.3–4MHz), or internal 2.25MHz oscillator (RT/SYNC tied to SVIN). The MODE pin selects among Burst Mode (75µA IQ), Pulse-Skipping, or Forced Continuous operation-critical for noise-sensitive or bidirectional current (e.g., DDR sink) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous - supports point-of-load regulation for high-performance processors and DDR memory rails. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V) and fixed 3.3V/5V supplies. |
| Feedback Accuracy | ±1% over –40°C to 150°C - ensures stable output under wide thermal stress in industrial and automotive environments. |
| Quiescent Current (Sleep) | 75µA - enables multi-day battery runtime in handheld devices during standby. |
| Switching Frequency | Up to 4MHz - allows use of sub-300nH inductors and compact ceramic output capacitors. |
| Top/Bottom RDS(ON) | 35mΩ / 25mΩ at 3.3V - minimizes conduction loss and thermal rise at full load. |
| Duty Cycle | 100% - maintains regulation down to VOUT + (IOUT × RDS(ON)) during brownout or battery depletion. |
Pinout & Package
Package: 24-pin 3mm × 5mm thermally enhanced QFN (UDD) with exposed PGND pad (Pin 25), rated for –40°C to 150°C junction temperature. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew rate control | Tied to SVIN enables DDR termination mode; resistor-to-GND adjusts slew rate; open = minimum slew. |
| RT/SYNC (2) | Frequency programming & sync input | Resistor sets fSW; external clock synchronizes switching; tied to SVIN → 2.25MHz internal oscillator. |
| SGND (3) | Signal reference ground | Reference for feedback, compensation, and logic circuits; must connect to PGND at single point to avoid noise coupling. |
| PVIN (4,10,11,17) | High-side MOSFET source supply | Independent power rail for P-channel switch; may be lower than SVIN to reduce gate drive loss. |
| SW (5,6,7,8,13,14,15,16) | Power switch node | Eight paralleled pins reduce inductance and current density; connects directly to inductor and high-frequency output capacitor. |
| RUN (19) | Enable/shutdown control | Logic-high enables regulation; pulled low disables all switching and reduces supply current to <1µA. |
| PGOOD (20) | Open-drain power-good indicator | Asserts after VFB remains within ±7.5% window for >100µs; actively pulls down in shutdown to discharge output caps. |
| MODE (21) | Operating mode selection | Voltage threshold determines Burst (≤0.3V), Pulse-Skipping (SVIN), or Forced Continuous (1.1V–0.58×SVIN) operation. |
| VFB (22) | Feedback voltage sensing | Monitors resistive divider output; internal 0.6V reference enables VOUT ≥ 0.6V configurations. |
| ITH (23) | Error amplifier output & current limit control | Voltage sets peak inductor current; tied to SVIN enables internal compensation and Active Voltage Positioning (AVP). |
| TRACK/SS (24) | Soft-start, tracking, or external reference | Capacitor-to-GND sets soft-start time; resistor-to-SVIN programs external ramp; used for supply sequencing or precision reference injection. |
| PGND (25) | Power ground return | Exposed pad; connects to source of N-channel MOSFET and must be low-impedance path to CIN/COUT negative terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Slew Rate on SW Node | Reduces EMI and voltage overshoot during load transients by limiting di/dt without sacrificing regulation speed. |
| Selectable Operating Modes | Burst Mode (75µA IQ), Pulse-Skipping (low ripple), or Forced Continuous (bidirectional current, noise control) - configurable per system requirement. |
| Active Voltage Positioning (AVP) | Internal compensation via ITH-to-SVIN connection enables dynamic VOUT droop under load, reducing required output capacitance for CPU/GPU rails. |
| DDR Memory Termination Support | SRLIM/DDR pin tied to SVIN configures ±3A sink/source capability and optimized transient response for DDR3/DDR4 VTT rails. |
| 100% Duty Cycle Low-Dropout | Maintains regulation when VIN approaches VOUT, extending battery life in portable systems during deep discharge. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Powering FPGA core voltage (1.0V/1.2V) or ASIC I/O rails in embedded industrial controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC from intermediate 3.3V/5V bus. Use Value: 6A output and ±1% accuracy ensure stable logic operation under dynamic load steps; 4MHz switching enables <1mm² inductor footprint. |
Use Scenario: Providing matched ±3A sourcing/sinking for DDR3/DDR4 VTT termination in laptops and servers. IC Role / Device Role / Timing Role: Dual-directional synchronous buck configured in DDR mode for active termination with fast transient response. Use Value: Internal DDR mode eliminates external op-amps; ±3A capability meets JEDEC VTT specs; programmable slew rate suppresses signal integrity issues. |
| Portable Computer Systems | Handheld Medical Devices |
Use Scenario: Main SoC core supply in tablets with single-cell Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across full battery range, including 100% duty cycle near end-of-discharge. Use Value: 75µA sleep current extends standby time; 95% peak efficiency minimizes heat in sealed enclosures; thermal QFN package sustains 150°C junction. |
Use Scenario: Powering precision analog front-end (AFE) and low-power MCU in battery-operated glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator supplying clean 3.3V/1.8V rails while preserving battery life during intermittent sensor sampling. Use Value: Burst Mode cuts no-load power to 75µA; ±1% accuracy ensures calibrated ADC readings; low output ripple avoids analog signal corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4A output, fixed 2MHz fSW, no DDR mode, 30µA IQ, 20V max VIN | Limited to lower-current loads; lacks AVP, tracking, and bidirectional DDR support. | Choose for cost-sensitive, non-DDR, <4A applications where 20V input tolerance is needed. |
| TPS546B24RVFT | 6A, 1.5MHz max fSW, PMBus interface, 12V max VIN, integrated telemetry | Supports digital configuration and monitoring but requires external components for DDR; larger 4mm × 4mm package. | Choose when system-level telemetry, remote configuration, or tighter digital power management is required. |
Compared with MP2315DJ-LF-Z and TPS546B24RVFT, the LTC3616HUDD#PBF uniquely combines 6A output, 4MHz programmability, DDR mode, AVP, and –40°C to 150°C operation in a compact 3mm × 5mm QFN-making it optimal for space-constrained, high-reliability portable and industrial buck applications requiring analog flexibility and thermal robustness.
Availability
LTC3616HUDD#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer systems requiring stable component supply with extended temperature reliability.
Supply support for LTC3616HUDD#PBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3616 product line was designed for high-efficiency, high-density DC/DC conversion in portable, industrial, and computing applications demanding ultra-low quiescent current, wide input range, and advanced control features like AVP and DDR termination.
FAQ
What is the maximum junction temperature rating for the LTC3616HUDD#PBF?
The LTC3616HUDD#PBF is specified for operation up to 150°C junction temperature, validated across the –40°C to 150°C range. This H-grade qualification makes it suitable for under-hood automotive modules, industrial motor drives, and sealed portable enclosures where ambient temperatures exceed 85°C. Thermal design must ensure θJA ≤ 38°C/W with proper exposed pad soldering to maintain reliability.
How does the LTC3616HUDD#PBF support DDR memory termination?
The LTC3616HUDD#PBF supports DDR termination by configuring the SRLIM/DDR pin to SVIN, enabling ±3A sourcing/sinking capability and optimized transient response for VTT rails. In this mode, the device regulates to half the supply voltage and provides fast current reversal-eliminating need for external op-amps or discrete FETs. The TRACK/SS pin also enables precise voltage tracking during DDR initialization sequences.
Can the LTC3616HUDD#PBF operate with input voltage below 2.25V?
No-the LTC3616HUDD#PBF has a guaranteed minimum input voltage of 2.25V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold risks UVLO activation, unstable regulation, or failure to start. For sub-2.25V inputs, consider alternative regulators such as the LTC3638 (1.8V min VIN) or discrete boost-buck solutions.
What is the purpose of the ITH pin on the LTC3616HUDD#PBF?
The ITH pin on the LTC3616HUDD#PBF serves as the error amplifier output and primary current limit control node. Its voltage (0.1V–1.05V) directly sets peak inductor current. Tying ITH to SVIN enables internal compensation and Active Voltage Positioning (AVP); external RC networks allow custom loop shaping. During short-circuit, ITH clamping reduces peak current to protect the IC and external components.
Does the LTC3616HUDD#PBF require an external catch diode?
No-the LTC3616HUDD#PBF integrates both high-side P-channel and low-side N-channel synchronous MOSFETs, eliminating the need for an external catch diode. This improves efficiency (up to 95%), reduces board area, and simplifies layout. The internal switches handle both sourcing and sinking current, enabling bidirectional operation essential for DDR termination and forced continuous mode.
LTC3616HUDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3616HUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616HUDD#PBF 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#PBF reliable?
The price and inventory of LTC3616HUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616HUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3616HUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616HUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616HUDD#PBF?
LTC3616HUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616HUDD#PBF 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#PBF?
For technical support, including LTC3616HUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616HUDD#PBF requirements.
6.How does Aetrix verify that LTC3616HUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3616HUDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3616HUDD#PBF?
All LTC3616HUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616HUDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3616HUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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