My Inquiry
My Account
Analog Devices Inc. LTC3616IUDD#PBF
- Part No.:
- LTC3616IUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616IUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:256
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3616IUDD#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 computer systems and DDR memory termination applications.
For engineers reviewing the LTC3616IUDD#PBF datasheet, LTC3616IUDD#PBF pinout, LTC3616IUDD#PBF application, or LTC3616IUDD#PBF equivalent, key selection considerations include programmable switching frequency up to 4MHz, selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal AVP support, adjustable soft-start, and DDR memory mode with ±3A sink capability.
Technical Context
The LTC3616IUDD#PBF 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 power stage features 35mΩ top (P-channel) and 25mΩ bottom (N-channel) switch RDS(ON) at 3.3V PVIN, supporting high-efficiency regulation across wide load ranges.
It integrates programmable slew rate limiting on SW node, active voltage positioning (AVP) via ITH pin, and multi-mode operation controlled by MODE pin voltage thresholds - including Burst Mode (75µA IQ), Pulse-Skipping, and Forced Continuous for EMI-sensitive designs. The device supports tracking, pre-biased start-up, and DDR-specific timing with SRLIM/DDR pin configuration.
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-cell Li-ion battery operation and fixed low-voltage rail compatibility. |
| Switching Frequency | Programmable up to 4MHz; allows use of compact 220nH inductors and reduces solution footprint. |
| Feedback Accuracy | ±1% over –40°C to 125°C; ensures stable regulation under thermal stress in industrial environments. |
| Quiescent Current | 75µA in Burst Mode sleep; extends battery life in always-on portable systems without compromising wake-up response. |
| Duty Cycle | 100% capability; maintains regulation down to VOUT + RDS(ON) × ILOAD, critical for low-VIN battery discharge phases. |
| Package Thermal Resistance | θJA = 38°C/W; exposed PGND pad requires PCB soldering for reliable 150°C max junction temperature operation. |
Pinout & Package
Available in a thermally enhanced 24-pin 3mm × 5mm QFN package (UDD) with exposed PGND pad (Pin 25) requiring PCB soldering. Pin count and layout match industry-standard 24-lead QFN footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode Configuration Input | Selects maximum slew rate (GND), adjustable slew (resistor-to-GND), or DDR mode (tied to SVIN). |
| RT/SYNC (2) | Oscillator Control | Sets switching frequency via resistor-to-GND, synchronizes to external clock ≤4MHz, or enables 2.25MHz internal oscillator (tied to SVIN). |
| SGND (3) | Signal Ground Reference | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point to avoid noise coupling. |
| PVIN (4,10,11,17) | Main Power Input | Supplies P-channel MOSFET source; independent of SVIN and may be lower voltage to reduce conduction loss. |
| SW (5,6,7,8,13,14,15,16) | Power Switch Node | Connects to inductor; eight paralleled pins minimize trace inductance and thermal resistance for 6A operation. |
| RUN (19) | Enable/Shutdown Control | Active-high logic input; <0.4V disables regulator and reduces supply current to <1µA. |
| PGOOD (20) | Open-Drain Status Output | Indicates VFB within ±7.5% window after 105µs blanking; actively pulls down in shutdown to discharge output caps. |
| MODE (21) | Operating Mode Selection | Voltage-controlled: SGND = Burst Mode, SVIN = Pulse-Skipping, 1.1V–0.58×SVIN = Forced Continuous, 0.45–0.8V = External-clamp Burst. |
| VFB (22) | Feedback Input | Monitors resistive divider output; internal 0.6V reference enables VOUT ≥0.6V configurations. |
| ITH (23) | Error Amplifier Compensation | Controls peak inductor current threshold; tied to SVIN enables internal compensation and AVP for dynamic load transient optimization. |
| TRACK/SS (24) | Soft-Start / Tracking Input | Enables internal soft-start (tied to SVIN), external RC timing, or supply tracking; also accepts external reference voltage. |
| PGND (25) | Power Ground Return | Exposes N-channel MOSFET source; must be soldered to large copper area for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Slew Rate on SW Node | Reduces EMI and switching noise via external resistor on SRLIM/DDR pin-critical for RF-sensitive handheld devices. |
| Adjustable Compensation via ITH Pin | Enables transient response optimization across diverse output capacitor types (ceramic, polymer) and load profiles (10mA–6A). |
| DDR Memory Termination Mode | Configurable ±3A sink/source capability with dedicated timing and voltage windows for JEDEC-compliant DDR3/DDR4 VTT rails. |
| 100% Duty Cycle Low-Dropout Operation | Maintains regulation during deep battery discharge (e.g., 2.5V IN → 1.8V OUT), extending runtime in portable computing. |
| Three-Mode Operating Flexibility | Burst Mode (75µA IQ), Pulse-Skipping (lower ripple), and Forced Continuous (EMI-controlled) selected via MODE pin voltage. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Local 1.8V/1.2V supply for FPGA core or SoC I/O banks in embedded industrial controllers. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise power with fast transient response. Use Value: ±1% output accuracy and 100% duty cycle ensure stable operation during brown-out conditions without system reset. |
Use Scenario: Bidirectional VTT termination rail for DDR3L memory subsystem in notebook computers. IC Role / Device Role / Timing Role: DDR-specific buck-boost capable regulator with ±3A sink/source and tracking alignment. Use Value: Integrated DDR mode eliminates need for external op-amps and discrete FETs, reducing BOM count by 7 components. |
| Portable Computer Systems | Handheld Medical Devices |
Use Scenario: Main system rail (3.3V/1.8V) in ultrabooks powered by single-cell Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: High-efficiency step-down converter with Burst Mode for standby and Forced Continuous for active compute. Use Value: 95% peak efficiency and 75µA quiescent current extend battery life >20% versus comparable 3A solutions. |
Use Scenario: Precision analog supply (1.2V, 2.5V) for ADCs and sensor front-ends in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with programmable frequency to avoid interference with RF signal chain. Use Value: Adjustable SW slew rate and Forced Continuous mode suppress switching artifacts below 1MHz, preserving SNR. |
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, 2.2–18V input, fixed 600kHz/1.2MHz frequency; no Burst Mode; higher IQ (120µA) | Lacks low-IQ sleep mode and DDR-specific features; better suited for wide-input industrial supplies. | Choose when input exceeds 5.5V or when fixed-frequency simplicity outweighs efficiency optimization. |
| MP2315DJ-LF-Z | 6A, 4.5–28V input, 500kHz–2MHz programmable frequency; no AVP, no DDR mode, no tracking | Designed for higher-VIN applications; lacks precision feedback accuracy (±2%) and thermal grade options. | Prefer for cost-sensitive 12V distributed supplies where ±1% accuracy and –40°C to 125°C operation are not required. |
Compared with TPS54620RGYT and MP2315DJ-LF-Z, the LTC3616IUDD#PBF offers superior light-load efficiency via Burst Mode, integrated DDR functionality, and tighter output accuracy-making it optimal for battery-powered, space-constrained, and memory-intensive designs.
Availability
LTC3616IUDD#PBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and handheld medical devices requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3616IUDD#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3616IUDD#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-current, high-frequency point-of-load conversion in space- and efficiency-critical portable and computing applications.
FAQ
What is the operating temperature range for the LTC3616IUDD#PBF?
The LTC3616IUDD#PBF is rated for –40°C to +125°C junction temperature operation and is specified to meet all electrical characteristics across this full range. Its UDD package uses a thermally enhanced QFN construction with exposed PGND pad, requiring proper PCB copper area for thermal dissipation to sustain 150°C max junction temperature under full 6A load.
How does the LTC3616IUDD#PBF support DDR memory termination?
The LTC3616IUDD#PBF supports DDR memory termination through its dedicated SRLIM/DDR pin (Pin 1) and internal timing logic. When SRLIM/DDR is tied to SVIN, the device enters DDR mode, enabling ±3A bidirectional current capability, synchronized tracking, and power-good behavior aligned with JEDEC VTT specifications for DDR3/DDR4 interfaces.
Can the LTC3616IUDD#PBF operate with a pre-biased output voltage?
Yes, the LTC3616IUDD#PBF supports start-up into a pre-biased output. In Forced Continuous mode (MODE pin set to 1.1V–0.58×SVIN), the device controls both sourcing and sinking currents during start-up, preventing reverse current flow and ensuring monotonic ramp-up even when VOUT is initially non-zero-verified in Figure 31 of the datasheet.
What are the key differences between Burst Mode and Forced Continuous mode on the LTC3616IUDD#PBF?
In Burst Mode, the LTC3616IUDD#PBF cycles the power switches intermittently at light loads, reducing IQ to 75µA but increasing output ripple. Forced Continuous mode maintains constant switching, minimizing ripple and EMI harmonics at the cost of higher light-load current (1.1mA typical). MODE pin voltage determines selection: SGND = Burst, 1.1V–0.58×SVIN = Forced Continuous.
Is the LTC3616IUDD#PBF pin-compatible with other variants like LTC3616EUDD#PBF or LTC3616HUDD#PBF?
Yes, the LTC3616IUDD#PBF shares identical 24-pin 3mm × 5mm QFN (UDD) package, pinout, and electrical interface with LTC3616EUDD#PBF, LTC3616HUDD#PBF, and LTC3616MPUDD#PBF. Only the guaranteed operating temperature range differs: I-grade is –40°C to 125°C, E-grade is 0°C to 85°C, H-grade is –40°C to 150°C, and MP-grade is –55°C to 150°C.
LTC3616IUDD#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)
LTC3616IUDD#PBF FAQ
1.How can I place an order for LTC3616IUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616IUDD#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 LTC3616IUDD#PBF reliable?
The price and inventory of LTC3616IUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616IUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3616IUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616IUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616IUDD#PBF?
LTC3616IUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616IUDD#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 LTC3616IUDD#PBF?
For technical support, including LTC3616IUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616IUDD#PBF requirements.
6.How does Aetrix verify that LTC3616IUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3616IUDD#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 LTC3616IUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3616IUDD#PBF?
All LTC3616IUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616IUDD#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 LTC3616IUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3616IUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3616IUDD#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
