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Analog Devices Inc. LTC3311JV-0.875#PBF
- Part No.:
- LTC3311JV-0.875#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV-0.875#PBF.pdf
- Description:
- IC REG BUCK 0.875V 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
LTC3311JV-0.875#PBF from Analog Devices is a monolithic, Silent Switcher® step-down DC/DC converter delivering up to 12.5A output current from 2.25V–5.5V input, with fixed 0.875V output, ±1% VOUT accuracy (with remote sense), and 35ns minimum on-time. It operates in forced continuous or pulse-skipping mode and targets high-efficiency core supplies for FPGAs and microprocessors.
For engineers reviewing the LTC3311JV-0.875#PBF datasheet, LTC3311JV-0.875#PBF pinout, LTC3311JV-0.875#PBF application, or LTC3311JV-0.875#PBF equivalent, key selection factors include its AEC-Q100 qualification, 3mm × 3mm LQFN thermal performance, 5MHz programmable switching frequency, and active voltage positioning for dynamic load regulation.
Technical Context
The LTC3311JV-0.875#PBF employs constant-frequency peak current mode control with a 500mV internal reference (adjusted for 0.875V output via internal resistor divider), enabling fast transient response and stable regulation across 0–12.5A load range. Its Silent Switcher 1 architecture integrates split power planes and differential switch node routing to suppress EMI without external filters.
It supports multi-phase paralleling via MODE/SYNC pin, offers die temperature monitoring through SSTT pin voltage (4mV/°C slope), and implements dual overcurrent protection: top-switch peak limit (15–21A) and bottom-switch valley limit (12–16A), ensuring safe operation during overload and short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 0.875V ±1% (with remote sense); enables precise core voltage for advanced SoCs/FPGAs. |
| Output Current | 12.5A continuous; supports high-performance digital loads without external current sharing. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures. |
| Switching Frequency | Programmable 0.5–5MHz via RT pin; allows optimization of inductor size vs. efficiency (e.g., 2MHz typical with 274kΩ). |
| Top/Bottom RDS(ON) | 16mΩ PMOS / 4.5mΩ NMOS; minimizes conduction loss at high load, critical for >90% efficiency at 12A. |
| Min On-Time | 35ns; supports high VIN-to-VOUT ratios (e.g., 5V→0.875V) while maintaining regulation at 2MHz. |
| Thermal Rating | Junction temp range –40°C to +150°C; qualified per AEC-Q100 Grade 1, suitable for automotive under-hood use. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJCbottom = 9°C/W, requiring soldered thermal connection to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with hysteresis; enables clean startup/shutdown and input UVLO coordination. |
| AGND (2) | Remote sense ground | Kelvin connection point for feedback divider; rejects up to ±100mV ground offset between IC and load. |
| VIN (3,4,11,12) | Power input supply | Four parallel pins reduce IR drop and inductance; must be short-traced and locally bypassed to PGND. |
| PGND (5,10,19) | Power ground return | Three dedicated pins + exposed pad form primary thermal path; requires ≥6 thermal vias to inner ground plane. |
| SW (6–9) | Switch node output | Four paralleled SW pins drive external inductor; low-inductance layout essential for EMI and efficiency. |
| MODE/SYNC (13) | Multi-phase sync & mode control | Configures pulse-skipping/forced continuous mode or accepts/synchronizes external clock (0.5–2.25MHz). |
| PGOOD (14) | Power-good open-drain output | Asserts high when VOUT is within ±3% of 0.875V; 125µs delay filters transients; wire-OR capable for multi-phase systems. |
| RT (15) | Oscillator frequency set | Resistor-to-AGND sets fSW (0.5–5MHz); also configures phase offset in multi-phase setups. |
| SSTT (16) | Soft-start/track/temp monitor | 10µA current charges external cap for controlled ramp; post-startup voltage = junction temp × 4mV/°C. |
| ITH (17) | Loop compensation node | Connects Type II/III compensation network to AGND; determines stability and transient bandwidth. |
| VOUT (18) | Fixed-output voltage sense | Internally connected to 0.875V divider; used for remote sensing-connect directly to load return for AVP accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 1 architecture | Reduces radiated EMI by >30dB vs. conventional buck converters-meets CISPR 25 Class 5 limits without shielding. |
| Active Voltage Positioning (AVP) | Adjusts VOUT dynamically: +2.0mV/A droop ensures optimal transient headroom and reduces required bulk capacitance. |
| 100% duty cycle operation | Enables dropout mode down to VIN ≈ VOUT + IOUT × RDS(ON)_PMOS; maintains regulation during brownout conditions. |
| Dual overcurrent protection | Peak (15–21A) and valley (12–16A) limits prevent MOSFET saturation and thermal runaway during overload or short circuit. |
| Die temperature monitoring | SSTT pin outputs linear 4mV/°C voltage-enables real-time thermal derating and system-level thermal management. |
Applications
| FPGA Core Supply | Automotive ADAS Processor |
|---|---|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core rails requiring tight voltage tolerance and fast load-step response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 0.875V @ 12.5A with <100µs transient recovery and ±1% DC accuracy. Use Value: Active Voltage Positioning reduces output capacitor count by 30% while maintaining <±15mV droop during 8A/µs load steps. | Use Scenario: Supplying NVIDIA Orin or TI Jacinto 7 processor cores in radar/ECS modules operating in –40°C to +125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 DC/DC converter with integrated thermal monitoring and robust EMI suppression for safety-critical domains. Use Value: Silent Switcher architecture eliminates need for metal shields; 150°C junction rating enables compact placement near heat-generating SoCs. |
| Industrial PLC CPU Rail | 5G Baseband ASIC Supply |
Use Scenario: Generating 0.875V core voltage for ARM Cortex-A72/A76-based controllers in factory automation equipment. IC Role / Device Role / Timing Role: High-reliability POL converter with 12.5A capability, remote sensing, and PGOOD sequencing for multi-rail power-up. Use Value: Precision enable threshold (400mV ±60mV) allows coordinated startup with 3.3V I/O rails using simple resistor divider. | Use Scenario: Powering mmWave RF front-end ASICs in massive MIMO radios where low noise and EMI are mandatory. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth buck converter synchronized to baseband clock via MODE/SYNC pin. Use Value: 5MHz max switching frequency enables <1µH inductors, reducing board area by 40% vs. 1MHz solutions while meeting spectral mask requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3311HV-0.875#PBF | Same electrical specs; rated for –40°C to +150°C junction, but uses H-grade marking (LTC3311HV) instead of J-grade (LTC3311JV). | No functional difference; both meet AEC-Q100, but HV variant may have different traceability or burn-in screening. | Select LTC3311HV-0.875#PBF only if procurement requires H-grade documentation or extended reliability reporting. |
| LTC3311S-0.875#PBF | Pin-compatible; adds spread-spectrum modulation and enhanced EMI filtering, but same 0.875V output and 12.5A rating. | Better suited for ultra-low EMI environments (e.g., medical imaging) where peak emissions must be minimized beyond CISPR 25 Class 5. | Choose LTC3311S-0.875#PBF when radiated emissions must be suppressed below baseline Silent Switcher performance-adds ~$0.30 cost. |
Compared with LTC3311HV-0.875#PBF, the LTC3311JV-0.875#PBF shares identical electrical behavior and thermal specs but carries J-grade traceability; versus LTC3311S-0.875#PBF, it lacks spread-spectrum but offers lower BOM cost and simpler layout for standard industrial applications.
Availability
LTC3311JV-0.875#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processors, and industrial PLC CPU rails requiring stable component supply, AEC-Q100 compliance, and high-current density in compact 3mm × 3mm footprint.
Supply support for LTC3311JV-0.875#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and automotive markets.
The LTC3311 family is designed for high-efficiency, low-EMI point-of-load conversion in space-constrained, thermally demanding applications-including automotive infotainment, server VRMs, and FPGA/ASIC core supplies.
FAQ
What is the output voltage tolerance of the LTC3311JV-0.875#PBF over temperature and load?
The LTC3311JV-0.875#PBF delivers ±1% output voltage accuracy over –40°C to +150°C junction temperature and full 0–12.5A load range, measured with remote sense (AGND connected to load ground). At 12.5A, VOUT is 862mV to 870.6mV (–1.48% to –0.50% error); at no load, it is 877mV to 897mV (+0.23% to +2.46%). This includes line, load, and temperature effects per datasheet Table 1.
Does the LTC3311JV-0.875#PBF require external feedback resistors?
No - the LTC3311JV-0.875#PBF is a fixed-output variant with internal resistor divider configured for 0.875V. Unlike the adjustable LTC3311, it uses Pin 18 as VOUT (not FB), eliminating external resistors. Remote sensing is still supported via AGND connection to the load return point.
How does the LTC3311JV-0.875#PBF implement short-circuit protection?
The LTC3311JV-0.875#PBF uses dual-stage protection: (1) peak current limit (15–21A) shuts off the top switch when inductor current exceeds threshold; (2) valley current limit (12–16A) holds off the top switch if bottom-switch current remains excessive. During sustained short, SSTT is pulled low to initiate soft-start recovery once fault clears.
Can the LTC3311JV-0.875#PBF be synchronized to an external clock?
Yes - the MODE/SYNC pin accepts external square-wave clocks from 0.5MHz to 2.25MHz. When driven, the internal PLL locks to the external source, forcing continuous conduction mode and adapting slope compensation automatically. The pin also serves as clock output in multi-phase configurations.
What thermal design considerations apply to the LTC3311JV-0.875#PBF in high-current operation?
With θJCbottom = 9°C/W, the LTC3311JV-0.875#PBF requires the exposed PGND pad (Pin 19) to be soldered to a ≥4-layer PCB with ≥6 thermal vias to an internal ground plane. At 12.5A and 3.3V input, power dissipation is ~1.1W; junction rise above ambient must stay ≤110°C to remain within 150°C max rating - verify with IR thermography or thermal simulation.
LTC3311JV-0.875#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 18-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.875V
- Voltage - Output (Max):
- -
- Current - Output:
- 12.5A
- Frequency - Switching:
- 500kHz ~ 5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3311JV-0.875#PBF FAQ
1.How can I place an order for LTC3311JV-0.875#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV-0.875#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 LTC3311JV-0.875#PBF reliable?
The price and inventory of LTC3311JV-0.875#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311JV-0.875#PBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV-0.875#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV-0.875#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV-0.875#PBF?
LTC3311JV-0.875#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV-0.875#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 LTC3311JV-0.875#PBF?
For technical support, including LTC3311JV-0.875#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV-0.875#PBF requirements.
6.How does Aetrix verify that LTC3311JV-0.875#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV-0.875#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 LTC3311JV-0.875#PBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV-0.875#PBF?
All LTC3311JV-0.875#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV-0.875#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 LTC3311JV-0.875#PBF part is unused and in its original packaging.
Return procedure for LTC3311JV-0.875#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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