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Analog Devices Inc. LTC3314AACBZ-R7
- Part No.:
- LTC3314AACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 30-UFBGA, WLCSP
- Datasheet:
-
LTC3314AACBZ-R7.pdf
- Description:
- IC REG BUCK ADJ 4A/4A 30WLCSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3314AACBZ-R7 from Analog Devices is a dual monolithic synchronous 4A step-down DC/DC regulator in a 30-lead 2.2mm × 2.7mm WLCSP package, operating from 2.25V to 5.5V input and delivering two independent 4A outputs or one 2-phase 8A output. It features ±1% total DC output error, 12mΩ high-side/8mΩ low-side MOSFETs, and supports 2MHz default switching frequency with programmability up to 3MHz - ideal for FPGA, ASIC, and µP core supplies in space-constrained telecom and server applications.
For engineers reviewing the LTC3314AACBZ-R7 datasheet, LTC3314AACBZ-R7 pinout, LTC3314AACBZ-R7 application, or LTC3314AACBZ-R7 equivalent, key selection criteria include its dual-buck vs. 2-phase configuration flexibility, 35ns minimum on-time for high VIN-to-VOUT ratios, Burst Mode operation with 1.4µA shutdown current, internal compensation, and precision enable/PGOOD for power sequencing in multi-rail systems.
Technical Context
The LTC3314AACBZ-R7 integrates two independent peak-current-mode buck regulators sharing a common oscillator and MODE/SYNC control logic. Each channel uses internal compensation, 500mV feedback reference, and separate EN/PGOOD/FB/SW/BST pins - enabling either dual-output or single 2-phase operation via FB2-to-AVIN connection.
Its 180° interleaved phase operation reduces input ripple current; forced continuous, pulse-skipping, and Burst Mode are selected via MODE/SYNC voltage level. Thermal protection triggers at 165°C with 5°C hysteresis, and overvoltage protection activates at 107–114% of regulated VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V intermediate bus architectures without external LDO pre-regulation. |
| Output Current | Dual 4A or 2-phase 8A - enables scalable POL delivery for high-current digital loads while minimizing thermal density per channel. |
| Switching Frequency | Programmable 1MHz to 3MHz - allows optimization of inductor size, efficiency, and EMI profile; default 2MHz reduces external component count. |
| Feedback Accuracy | ±1% total DC error - ensures tight regulation across line, load, and temperature for sensitive core supplies (e.g., FPGA I/O or CPU cores). |
| Quiescent Current | 1.4µA in shutdown - critical for always-on subsystems and battery-backed applications requiring ultra-low standby power. |
| Minimum On-Time | 35ns - supports high step-down ratios (e.g., 5V → 0.5V) without pulse skipping, maintaining regulation at light loads. |
| Package | 30-lead WLCSP (2.2mm × 2.7mm × 0.5mm) - delivers high power density with low thermal resistance (θJCtop = 2.7°C/W) for compact PCB layouts. |
Pinout & Package
Package: 30-lead Wafer Level Chip Scale Package (WLCSP), 2.2mm × 2.7mm × 0.5mm, MSL Level 1, –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN1, PVIN2 (A1,A2,F1,F2) | Power input for Buck 1 and Buck 2 | Separate high-current inputs requiring individual 10μF low-ESR bypass caps to PGND; internally isolated but externally shorted for shared VIN rail. |
| SW1, SW2 (A3,B1,B2,B3,E1,E2,E3,F3) | Switch node for each buck | Connects to external inductors; high di/dt path requiring short, low-inductance routing and local ceramic decoupling. |
| BST1, BST2 (A4,F4) | Bootstrap supply for high-side gate drive | Requires 22nF capacitor between BSTx and corresponding SWx to sustain gate voltage during high-side conduction. |
| FB1, FB2 (A5,F5) | Feedback input for output voltage regulation | Regulated to 500mV; FB2 tied to AVIN configures 2-phase mode; resistor divider sets VOUT with ±1% accuracy. |
| EN1, EN2 (B5,E5) | Active-high enable control | 400mV precision threshold enables power sequencing; tie to AVIN for always-on, or use resistor divider for voltage-triggered startup. |
| PGOOD1, PGOOD2 (B4,E4) | Open-drain power-good indicator | Asserts low when VOUT deviates >3% from target or PVIN <2.25V; used for system-level fault detection and rail sequencing. |
| MODE/SYNC (D4) | Operating mode selection & external clock sync | Ground = pulse-skipping; float = forced continuous; AVIN = Burst Mode; external square wave synchronizes both channels. |
| RT (C4) | Frequency programming resistor | Resistor to AGND sets fSW from 1–3MHz; tie to AVIN for default 2MHz operation - eliminates need for external clock source. |
| AVIN (C5), AGND (D5), PGND (C1,C2,C3,D1,D2,D3) | Analog bias supply, analog ground, power ground | AVIN filtered via internal 20Ω resistors from PVIN; AGND is reference for FB dividers; PGND is high-current return for bottom FETs and thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4A or 2-phase 8A configuration | Single IC replaces two discrete 4A bucks or one large 8A controller+MOSFET solution, reducing BOM count and layout area by >40%. |
| 180° interleaved switching | Cuts input RMS ripple current by ~70% versus single-phase operation, relaxing input capacitor requirements and lowering EMI. |
| Burst Mode with 1.4µA shutdown | Extends battery life in portable equipment and enables zero-power standby states in always-on IoT edge nodes. |
| Internal compensation | Eliminates external compensation network, reducing design cycle time and component count while ensuring stability across all operating conditions. |
| 500mV precision feedback reference | Enables accurate low-VOUT regulation (down to 0.5V) for advanced process nodes (e.g., 0.8V FPGA cores) without external reference drift. |
| Overvoltage & short-circuit protection | Prevents damage to downstream logic during fault conditions; OVP triggers at 107–114% VOUT, and current limits protect against sustained overload. |
Applications
| FPGA Core Supply | Telecom POL Module |
|---|---|
|
Use Scenario: Powering 7nm/5nm FPGA core rails requiring tightly regulated 0.75V–1.2V at up to 8A with fast transient response to logic switching. IC Role / Device Role / Timing Role: Dual-buck configured as 2-phase 8A regulator delivering low-noise, high-efficiency core voltage with synchronized PGOOD signaling for FPGA configuration lock. Use Value: 35ns minimum on-time supports 5V→0.75V conversion; 180° interleaving reduces output voltage ripple to <10mVP-P under 4A step load. |
Use Scenario: Distributed point-of-load regulation in 5G baseband units where space, thermal density, and EMI compliance are critical constraints. IC Role / Device Role / Timing Role: Dual independent 4A bucks powering separate RF front-end and digital processing sub-systems with independent enable/sequencing control. Use Value: 2.2mm × 2.7mm WLCSP footprint saves >65% board area vs. discrete solutions; Burst Mode achieves >85% efficiency at 10mA load for sleep-state power savings. |
| Server Memory Subsystem | Automotive ADAS Domain Controller |
|
Use Scenario: Supplying DDR5 memory VDD/VDDQ rails (1.1V/1.8V) with strict ±3% tolerance and low noise in high-density server DIMMs. IC Role / Device Role / Timing Role: Two independent LTC3314AACBZ-R7 channels regulating VDD and VDDQ, each with dedicated PGOOD and soft-start timing. Use Value: ±1% DC accuracy and <0.1%/V line regulation ensure compliance with JEDEC DDR5 specs; thermal shutdown at 165°C protects against airflow failure. |
Use Scenario: Powering vision processor SoCs in automotive camera modules requiring AEC-Q200-compliant, high-reliability DC/DC conversion. IC Role / Device Role / Timing Role: Configured as dual 4A bucks for SoC core (1.0V) and I/O (1.8V) rails, with precision enable thresholds enabling safe power-up sequencing per ISO 26262 ASIL-B requirements. Use Value: 125°C max junction rating and robust overvoltage/short-circuit protection meet automotive functional safety demands without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2149GQ-Z (Monolithic Power) | 4A dual buck in 3mm × 4mm QFN; fixed 2.2MHz fSW; no 2-phase mode; 15mΩ/8mΩ RDS(ON); 2.5V–5.5V VIN | Lacks 2-phase 8A capability and programmable frequency; simpler control but less flexible for high-current scaling. | Select MP2149GQ-Z when dual 4A outputs suffice and board space allows larger QFN; avoid if 2-phase operation or sub-2.5V VIN is required. |
| TPS544B25RJER (Texas Instruments) | 4A dual buck in 4mm × 4mm QFN; 2.2V–5.5V VIN; 12mΩ/7mΩ RDS(ON); supports 2-phase via external sync; requires external compensation | Requires external compensation network and external clock for 2-phase sync; higher pin count and layout complexity. | Choose TPS544B25RJER only when design requires TI's WEBENCH integration or compatibility with existing TI-based power architecture. |
Compared with MP2149GQ-Z and TPS544B25RJER, the LTC3314AACBZ-R7 uniquely combines dual/2-phase configurability, internal compensation, 35ns min-on-time, and WLCSP packaging - delivering superior power density and design simplicity for next-gen compute and comms platforms.
Availability
LTC3314AACBZ-R7 is available at Aetrix Electronics and suitable for FPGA core supplies, telecom POL modules, and server memory subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3314AACBZ-R7 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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets with precision, reliability, and innovation.
The LTC3314AACBZ-R7 belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for high-density, high-efficiency point-of-load conversion in space- and thermally constrained applications such as 5G infrastructure and AI accelerators.
FAQ
What is the maximum output current capability of the LTC3314AACBZ-R7 in dual-buck versus 2-phase configuration?
The LTC3314AACBZ-R7 delivers two independent 4A outputs in dual-buck mode, or a single 8A output in 2-phase configuration. In 2-phase mode, peak inductor currents are matched within 10% due to internal circuit matching, and interleaving reduces input ripple by ~70%. The device maintains full 8A capability across its –40°C to +125°C operating junction temperature range, with thermal shutdown engaging at 165°C to protect against sustained overload.
How does the LTC3314AACBZ-R7 achieve high efficiency at light loads?
The LTC3314AACBZ-R7 achieves high light-load efficiency through Burst Mode operation, where the regulator charges the output capacitor above the regulation threshold, then enters a low-power sleep state until VOUT drops below the programmed window. During sleep, most internal circuitry powers down, reducing quiescent current to 90µA (one buck enabled) or 130µA (both bucks enabled). Shutdown current drops to just 1.4µA, making it ideal for battery-powered or always-on applications.
Can the LTC3314AACBZ-R7 be synchronized to an external clock, and what are the timing requirements?
Yes, the LTC3314AACBZ-R7 can be synchronized to an external clock applied to the MODE/SYNC pin. The minimum high or low pulse width must be ≥40ns, and the external clock frequency must fall within the 1MHz–3MHz range. When synchronized, the internal PLL adapts slope compensation automatically, ensuring stable operation across the full load range without manual tuning. This enables deterministic EMI reduction in systems with multiple switching regulators.
What is the role of the RT pin, and how is switching frequency programmed?
The RT pin programs the LTC3314AACBZ-R7's switching frequency using an external resistor to AGND. A 34.8kΩ resistor sets fSW to 2MHz; values from 20kΩ to 75kΩ scale frequency from 1MHz to 3MHz. If RT is tied to AVIN, the device operates at its default 2MHz frequency. The RT pin is ignored when an external clock drives MODE/SYNC, allowing seamless transition between free-running and synchronized modes without hardware changes.
Does the LTC3314AACBZ-R7 require external compensation components?
No, the LTC3314AACBZ-R7 features fully internal compensation for both buck channels. This eliminates the need for external Type-II or Type-III compensation networks, reducing BOM count, PCB area, and design validation effort. Internal compensation is optimized for stability across all standard output capacitors (including ceramic and polymer types) and inductor values specified in the datasheet, supporting rapid prototyping and production ramp.
LTC3314AACBZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 30-UFBGA, WLCSP
- 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):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A, 4A
- Frequency - Switching:
- 1MHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-WLCSP (2.2x2.7)
LTC3314AACBZ-R7 FAQ
1.How can I place an order for LTC3314AACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3314AACBZ-R7 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 LTC3314AACBZ-R7 reliable?
The price and inventory of LTC3314AACBZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3314AACBZ-R7 is usually 5 days.
3.What payment methods are accepted for LTC3314AACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3314AACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3314AACBZ-R7?
LTC3314AACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3314AACBZ-R7 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 LTC3314AACBZ-R7?
For technical support, including LTC3314AACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3314AACBZ-R7 requirements.
6.How does Aetrix verify that LTC3314AACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All LTC3314AACBZ-R7 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 LTC3314AACBZ-R7 meets industry standards.
7.What is the process for return or replacement of LTC3314AACBZ-R7?
All LTC3314AACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3314AACBZ-R7, 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 LTC3314AACBZ-R7 part is unused and in its original packaging.
Return procedure for LTC3314AACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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