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Analog Devices Inc. LTC3614HUDD#TRPBF
- Part No.:
- LTC3614HUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3614HUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
LTC3614HUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 4A, 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 point-of-load power to DDR memory termination, portable computing rails, and handheld device SoCs.
For engineers reviewing the LTC3614HUDD#TRPBF datasheet, LTC3614HUDD#TRPBF pinout, LTC3614HUDD#TRPBF application, or LTC3614HUDD#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, programmable 300kHz–4MHz switching frequency, selectable Burst/Pulse-Skipping/Forced Continuous modes, internal AVP support, and 24-pin 3mm × 5mm QFN thermal package.
Technical Context
The LTC3614HUDD#TRPBF implements constant-frequency current-mode control with adjustable slope compensation and dual MOSFET drivers-integrated P-channel high-side and N-channel low-side switches. Its error amplifier transconductance is 200µS, and ITH pin voltage (0.1V–0.8V) directly controls peak inductor current up to 9A typical.
It supports three frequency-setting methods: external RT resistor (300kHz–4MHz), synchronization to external clock (up to 4MHz), or internal 2.25MHz oscillator. The MODE pin selects among four operating modes-Burst Mode (internal/external clamp), Pulse-Skipping, and Forced Continuous-with distinct ITH clamping and sleep-state behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous; enables single-chip supply for DDR termination and mid-power SoC cores. |
| Input Voltage Range | 2.25V to 5.5V; supports single Li-Ion battery (2.7–4.2V) and fixed 3.3V/5V rails without external LDO pre-regulation. |
| Switching Frequency | Programmable up to 4MHz; allows use of ≤330nH inductors and compact ceramic output capacitors. |
| Feedback Accuracy | ±1% over –40°C to 150°C; ensures stable 0.6V–3.3V output regulation across automotive and industrial thermal extremes. |
| Quiescent Current | 75µA in Burst Mode at no load; extends battery runtime in always-on subsystems without sacrificing transient response. |
| Duty Cycle | 100% capability; maintains regulation down to VIN = VOUT + RDS(ON)_PCH × IOUT, critical for battery end-of-discharge operation. |
| Thermal Rating | Junction temperature rated to 150°C; validated for high-ambient applications including under-hood automotive and enclosed industrial enclosures. |
Pinout & Package
The LTC3614HUDD#TRPBF is housed in a thermally enhanced 24-pin 3mm × 5mm QFN package with exposed PGND pad (Pin 25) requiring PCB soldering for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew rate control | Tied to SVIN enables DDR termination mode; grounded sets max slew rate; resistor-to-GND adjusts dV/dt for EMI reduction. |
| RT/SYNC (2) | Oscillator timing interface | Accepts resistor (sets fSW), external clock (synchronizes up to 4MHz), or SVIN (enables 2.25MHz internal oscillator). |
| SGND (3) | Signal reference ground | Reference for feedback, compensation, and logic; must connect to PGND at single point to avoid noise coupling. |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent of SVIN; can be tied to lower voltage rail to reduce gate drive losses and improve efficiency at light loads. |
| SW (5,6,7,8,13,14,15,16) | Switch node connection | Eight paralleled pins reduce trace inductance and conduction loss; connects directly to inductor and high-frequency output capacitor. |
| RUN (19) | Enable control input | Active-high logic; <0.4V disables regulator and reduces supply current to <1µA for system-level power sequencing. |
| PGOOD (20) | Open-drain status flag | Asserts low when VFB deviates >±7.5% from setpoint; actively pulls down in shutdown to discharge output caps via external resistor. |
| MODE (21) | Operating mode selector | Voltage-controlled: 0V = Burst Mode (internal clamp), SVIN = Pulse-Skipping, 1.1V–0.58×SVIN = Forced Continuous. |
| VFB (22) | Feedback voltage input | Monitors resistive divider output; internal 0.6V reference enables outputs from 0.6V to 3.3V with ±1% accuracy over full temp range. |
| ITH (23) | Error amplifier output & current limit control | Voltage (0.1–0.8V) sets peak inductor current; tied to SVIN enables internal compensation and Active Voltage Positioning (AVP). |
| TRACK/SS (24) | Soft-start / tracking / reference input | Enables internal soft-start (0.65–1.9ms), external ramp tracking, or external reference injection for multi-rail sequencing. |
| PGND (25) | Power ground return | Exposed thermal pad; must be soldered to large copper area for θJA = 38°C/W and safe 4A operation at 150°C TJ. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous MOSFETs | Eliminates external catch diode; 35mΩ PCH / 25mΩ NCH RDS(ON) at 3.3V PVIN enables >95% peak efficiency and reduced BOM count. |
| Programmable slew rate on SW node | Adjustable via SRLIM/DDR pin to suppress EMI emissions without compromising transient response or efficiency. |
| Active Voltage Positioning (AVP) | Enabled by tying ITH to SVIN; dynamically lowers output voltage under load to minimize IR drop and power loss in high-current DDR applications. |
| DDR memory termination mode | Activated by tying SRLIM/DDR to SVIN; supports ±3A sourcing/sinking with fast transient recovery for DDR2/DDR3 VTT rails. |
| Three-phase soft-start control | Internal (TRACK/SS = SVIN), external RC-timed, or tracking-based; prevents inrush current and enables precise power-up sequencing with other regulators. |
Applications
| DDR Memory Termination | Portable Computer Core Supply |
|---|---|
Use Scenario: Providing tightly regulated ±3A VTT rail for DDR2/DDR3 memory interfaces in ultrabooks and 2-in-1 devices. IC Role / Device Role / Timing Role: Synchronous buck controller with DDR mode, active voltage positioning, and bidirectional current capability. Use Value: Maintains VTT within ±1% while sinking 3A during memory write cycles and sourcing 3A during reads-reducing board area versus discrete solutions. | Use Scenario: Generating 1.2V/1.8V core voltage for ARM Cortex-A series SoCs in battery-powered tablets and handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency, low-noise point-of-load regulator with programmable frequency and forced continuous mode for clean analog/RF domains. Use Value: 75µA quiescent current in Burst Mode extends standby time; 4MHz switching minimizes inductor size (<1.5mm height) for thin form factors. |
| Industrial Sensor Node Power | Automotive Infotainment PMIC Sub-Rail |
Use Scenario: Powering ultra-low-power microcontrollers and precision ADCs in wireless sensor nodes deployed in harsh environments. IC Role / Device Role / Timing Role: Wide-input, high-accuracy buck converter with 150°C junction rating and ±1% VFB tolerance over full temperature range. Use Value: Stable 3.3V output from 2.25–5.5V input eliminates need for upstream pre-regulator; 100% duty cycle sustains operation as primary battery discharges to 2.4V. | Use Scenario: Delivering 1.1V GPU core rail in automotive infotainment head units where ambient temperatures exceed 105°C. IC Role / Device Role / Timing Role: AEC-Q200–capable (via H-grade qualification) synchronous buck with robust thermal design and fault reporting via PGOOD. Use Value: Validated 150°C operation enables placement near heat-generating processors; open-drain PGOOD simplifies integration into vehicle watchdog systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B25RTER | 4A, 2.2MHz max fSW, 2.95–16V input, integrated FETs, but only rated to 125°C TJ. | Lacks DDR mode, AVP, and 150°C rating; unsuitable for under-hood or extended-temperature industrial use. | Select LTC3614HUDD#TRPBF when 150°C operation, DDR termination, or sub-100µA IQ is required. |
| MP2315GJ-Z | 3A, 2MHz max fSW, 4.5–28V input, smaller 2x2mm QFN, but no Burst Mode, no DDR mode, and only 125°C TJ rating. | Higher minimum input voltage excludes single-cell Li-Ion use; lacks soft-start tracking and AVP features. | Choose LTC3614HUDD#TRPBF for battery-powered designs needing 2.25V start-up, low IQ, and multi-mode flexibility. |
Compared with TPS544B25RTER and MP2315GJ-Z, the LTC3614HUDD#TRPBF uniquely combines 4A output, 150°C junction rating, DDR mode, AVP, and 75µA Burst Mode IQ-making it the only qualified solution for high-reliability, thermally constrained, or DDR-specific point-of-load applications.
Availability
LTC3614HUDD#TRPBF is available at Aetrix Electronics and suitable for DDR memory termination, portable computer core supplies, and industrial sensor node power requiring stable component supply across extended temperature ranges.
Supply support for LTC3614HUDD#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 full product support, documentation, and manufacturing continuity for all Linear-branded ICs.
The LTC3614HUDD#TRPBF belongs to Linear's high-performance power management portfolio, designed specifically for demanding point-of-load and battery-operated applications requiring precision regulation, wide temperature operation, and advanced power-saving modes.
FAQ
What is the maximum junction temperature specification for the LTC3614HUDD#TRPBF?
The LTC3614HUDD#TRPBF is specified for operation up to 150°C junction temperature, with guaranteed electrical performance across –40°C to 150°C. This H-grade rating distinguishes it from E/I-grade variants (125°C max) and enables deployment in under-hood automotive, industrial enclosures, and high-density portable systems where thermal margins are constrained.
Does the LTC3614HUDD#TRPBF support DDR memory termination with bidirectional current capability?
Yes, the LTC3614HUDD#TRPBF supports DDR termination mode when the SRLIM/DDR pin is tied to SVIN. In this mode, it delivers ±3A sourcing/sinking capability with fast transient response, making it suitable for DDR2/DDR3 VTT rails. The device maintains regulation during both charge and discharge phases without external components.
How does the MODE pin configure operating modes on the LTC3614HUDD#TRPBF?
The MODE pin on the LTC3614HUDD#TRPBF selects among four modes: grounding enables Burst Mode with internal clamp; connecting to SVIN enables Pulse-Skipping; applying 1.1V–0.58×SVIN enables Forced Continuous; and applying 0.45V–0.8V enables Burst Mode with external clamp. Each setting alters ITH clamping, sleep-state behavior, and light-load efficiency.
Can the LTC3614HUDD#TRPBF operate from a single Li-Ion battery without pre-regulation?
Yes, the LTC3614HUDD#TRPBF operates from 2.25V to 5.5V, fully covering the discharge curve of a single Li-Ion cell (2.7V–4.2V). Its 100% duty cycle capability sustains regulation even as the battery drops below the output voltage, eliminating the need for inefficient pre-regulators in portable designs.
What thermal design guidance applies to the LTC3614HUDD#TRPBF's exposed PGND pad?
The exposed PGND pad (Pin 25) of the LTC3614HUDD#TRPBF must be soldered to a minimum 100mm² copper area on the PCB to achieve the specified θJA of 38°C/W. Thermal vias (≥6×0.3mm diameter) should connect the pad to inner-layer ground planes to ensure reliable 4A operation at 150°C junction temperature.
LTC3614HUDD#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:
- 4A
- 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)
LTC3614HUDD#TRPBF FAQ
1.How can I place an order for LTC3614HUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3614HUDD#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 LTC3614HUDD#TRPBF reliable?
The price and inventory of LTC3614HUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3614HUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3614HUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3614HUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3614HUDD#TRPBF?
LTC3614HUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3614HUDD#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 LTC3614HUDD#TRPBF?
For technical support, including LTC3614HUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3614HUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3614HUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3614HUDD#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 LTC3614HUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3614HUDD#TRPBF?
All LTC3614HUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3614HUDD#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 LTC3614HUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3614HUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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