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Analog Devices Inc. LTC7819RUJ#PBF
- Part No.:
- LTC7819RUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC7819RUJ#PBF.pdf
- Description:
- LOW IQ TRIPLE OUTPUT BUCK CONTRO
- Quantity:
- Payment:
- Shipping:
Inventory:3,060
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Product details
Overview
LTC7819RUJ#PBF from Analog Devices is a 40V, triple-output, 3-phase synchronous step-down controller driving all-N-channel MOSFET stages. It delivers up to 3MHz phase-lockable switching frequency, 14μA no-load quiescent current, 0.8V precision reference, and spread-spectrum EMI reduction - enabling high-efficiency, low-noise power delivery in automotive ADAS domain controllers.
For engineers reviewing the LTC7819RUJ#PBF datasheet, LTC7819RUJ#PBF pinout, LTC7819RUJ#PBF application, or LTC7819RUJ#PBF equivalent, key selection considerations include its 3-phase out-of-phase operation for input ripple cancellation, PassThru™ 100% duty cycle on Channel 1, AEC-Q100 qualification, and RSENSE/DCR current sensing flexibility.
Technical Context
The LTC7819RUJ#PBF implements constant-frequency peak current-mode control across three independent buck channels operating 120° out of phase. Each channel features dedicated ITH error amplifier outputs, programmable soft-start via TRACK/SS pins, and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous) controlled by the MODE pin.
It integrates bootstrap charge pumps for all three high-side drivers, with an internal charge pump exclusively for Channel 1 enabling true 100% duty cycle operation. Spread spectrum dithering is applied to the oscillator when PLLIN/SPREAD = INTVCC, reducing peak conducted and radiated EMI without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery transients and industrial 24V/36V rails without pre-regulation. |
| No-Load Quiescent Current | 14μA (Channel 1 active, 14V→3.3V) - extends runtime in always-on vehicle modules like telematics or camera ECUs. |
| Switching Frequency Range | 100kHz to 3MHz, programmable via FREQ pin resistor or PLLIN sync - enables optimization for size (high-f), efficiency (mid-f), or EMI (spread-spectrum at 2.25MHz). |
| Output Voltage Accuracy | ±1.5% over temperature (0.788V–0.812V at VFB) - ensures tight regulation for sensitive SoC core supplies (e.g., 1V, 3.3V, 5V rails). |
| Duty Cycle Capability | 100% on Channel 1 (PassThru™); 99% on Channels 2 & 3 - supports high-VIN-to-low-VOUT conversion (e.g., 36V→3.3V) without dropout. |
| Current Sense Threshold | 50mV typ (±3.5mV matching between channels) - enables accurate, matched current limiting across three phases for balanced load sharing. |
| Operating Junction Temp | −40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive environments. |
Pinout & Package
Package: 40-lead 6mm × 6mm QFN with exposed thermal pad (Pin 41 = GND), rated θJA = 33°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 24) | Main bias supply input | Accepts 4.5V–40V; powers internal LDOs and logic; requires local ceramic bypass capacitor. |
| SW1/SW2/SW3 (Pins 28/19/31) | Switch node connections | Drive external inductors; high dv/dt nodes requiring tight layout and Kelvin sensing for stability. |
| TG1/TG2/TG3 (Pins 27/18/32) | Top N-MOSFET gate drivers | Floating outputs referenced to SW; drive high-side FETs with 2Ω pull-up/pull-down resistance. |
| BG1/BG2/BG3 (Pins 25/21/29) | Bottom N-MOSFET gate drivers | GND-referenced outputs; 2Ω pull-down resistance enables fast low-side turn-off. |
| BOOST1/BOOST2/BOOST3 (Pins 26/20/30) | Bootstrap supply terminals | Charge external bootstrap capacitors; Channel 1 includes integrated charge pump for 100% duty cycle. |
| SENSE1+/SENSE1− etc. (Pins 4/3, 12/11, 38/39) | Differential current sense inputs | Support RSENSE or DCR sensing; ±3.5mV matching enables precise per-phase current monitoring. |
| MODE (Pin 1) | Light-load operation mode select | Ground = Burst Mode®; INTVCC = forced continuous; 100kΩ to INTVCC = pulse-skipping - configures all three channels simultaneously. |
| RUN1/RUN2/RUN3 (Pins 10/9/8) | Independent channel enable inputs | Logic-high (>1.2V) enables channel; all <0.7V = full shutdown (1.5μA IQ) - supports staggered startup and fault isolation. |
| PLLIN/SPREAD (Pin 34) | Sync input / spread-spectrum control | External clock input for phase-locking; tied to INTVCC = spread-spectrum enabled; tied to GND = fixed frequency. |
| VPRG1 (Pin 16) | Channel 1 output voltage programming | Floating = adjustable via VFB1 divider; GND = 3.3V fixed; INTVCC = 5V fixed - simplifies common rail designs. |
Key Features
| Feature | Design Value |
|---|---|
| 3-Phase Out-of-Phase Operation | Channels operate 120° apart, reducing RMS input capacitor ripple current by >50% vs. single-phase - cuts required bulk capacitance and EMI filter size. |
| PassThru™ 100% Duty Cycle (Ch1) | Integrated charge pump sustains top-FET gate drive during dropout, enabling seamless transition from buck to linear pass-through - critical for cold-crank 4.5V support. |
| Spread Spectrum Modulation | ±20% frequency dithering reduces peak EMI amplitude by >10dB without altering layout or adding filters - accelerates CISPR 25 Class 5 compliance. |
| OPTI-LOOP™ Compensation | Single-pole compensation via ITH pin allows stable loop response across wide output capacitance (10μF–1000μF) and ESR ranges - eliminates trial-and-error tuning. |
| AEC-Q100 Qualified | Rated −40°C to +150°C junction, with automotive reliability testing (HTOL, TC, UHAST) - approved for safety-critical ADAS, infotainment, and body control modules. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC Power Management |
|---|---|
Use Scenario: Powering multi-rail SoC (1V core, 1.8V I/O, 3.3V interface) in radar/Ethernet gateway units exposed to 45V load-dump transients. IC Role / Device Role / Timing Role: Triple synchronous buck controller managing independent 3.3V, 5V, and 1V outputs with phase interleaving and spread spectrum to meet CISPR 25 Class 5 limits. Use Value: 14μA quiescent current maintains battery reserve during parking mode; AEC-Q100 rating ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Generating isolated 5V, 12V, and 24V auxiliary rails from unregulated 36V DC bus in modular I/O backplanes. IC Role / Device Role / Timing Role: High-voltage triple controller delivering regulated outputs with 100% duty cycle on Channel 1 to sustain 24V rail during brownout conditions. Use Value: RSENSE/DCR flexibility supports cost-optimized current sensing; 3MHz capability shrinks magnetics for space-constrained DIN-rail enclosures. |
| Avionics Flight Control Unit | Server Rack Management Controller |
Use Scenario: Providing fault-tolerant 28V→3.3V/5V/12V conversion in dual-redundant flight computers where EMI must not interfere with RF receivers. IC Role / Device Role / Timing Role: Triple-phase controller with independent RUN pin control enabling graceful degradation - one channel can be disabled without affecting others. Use Value: Spread spectrum + 120° phase shift lowers peak input current harmonics; 150°C max junction temp supports conduction-cooled chassis mounting. |
Use Scenario: Consolidating multiple point-of-load regulators into a single compact solution for BMC (Baseboard Management Controller) power sequencing. IC Role / Device Role / Timing Role: Synchronous buck controller implementing precise TRACK/SS ramp timing across three rails to meet Intel VR14/VR15 sequencing requirements. Use Value: Independent TRACK/SS1/2/3 pins allow custom soft-start delays; PGOOD1/2/3 open-drain outputs interface directly with FPGA sequencers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7813IUJ#PBF | Single-output, 40V, 3MHz controller; lacks multi-phase support, spread spectrum, and PassThru™ | Suitable only for single-rail systems; cannot replace LTC7819RUJ#PBF in triple-output or phase-interleaved designs | Select only when system requires one high-voltage buck stage with minimal BOM count and no multi-rail coordination. |
| MP2964GQ-Z | Triple-output, 30V max input, no spread spectrum, non-AEC-Q100, 25μA IQ (vs 14μA) | Targeted at commercial/industrial servers; lacks automotive qualification and cold-crank robustness below 4.5V | Consider for cost-sensitive non-automotive applications where 40V rating and 150°C operation are not required. |
Compared with LTC7813IUJ#PBF and MP2964GQ-Z, the LTC7819RUJ#PBF uniquely combines triple-phase interleaving, AEC-Q100 qualification, 100% duty cycle on Channel 1, and integrated spread spectrum - making it the only option for high-reliability, EMI-sensitive, multi-rail automotive power systems.
Availability
LTC7819RUJ#PBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC power management, avionics flight control units, and server rack management controllers requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LTC7819RUJ#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 digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC7819RUJ#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, low-EMI, multi-rail power conversion in demanding automotive and industrial environments where reliability, thermal robustness, and regulatory compliance are critical.
FAQ
What is the maximum input voltage rating for the LTC7819RUJ#PBF?
The LTC7819RUJ#PBF has an absolute maximum input supply voltage (VIN) rating of 40V, with recommended operating range from 4.5V to 40V. Exceeding 40V may cause permanent damage. The device is designed to withstand automotive load-dump transients up to 45V when used with appropriate input clamping circuitry external to the IC.
Does the LTC7819RUJ#PBF support synchronization to an external clock source?
Yes, the LTC7819RUJ#PBF supports external synchronization via the PLLIN/SPREAD pin (Pin 34). When an external clock is applied, the phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge. The device operates in pulse-skipping or forced continuous mode during sync, depending on the MODE pin configuration.
How does the PassThru™ feature work on Channel 1 of the LTC7819RUJ#PBF?
The LTC7819RUJ#PBF implements PassThru™ on Channel 1 using an integrated bootstrap charge pump that sustains gate drive for the top N-MOSFET even when VIN approaches VOUT. This enables true 100% duty cycle operation, allowing uninterrupted power delivery during input brownouts - a critical capability for automotive cold-crank (4.5V) operation.
Can the LTC7819RUJ#PBF be used in AEC-Q100 automotive applications?
Yes, the LTC7819RUJ#PBF is explicitly qualified per AEC-Q100 Grade 1 (−40°C to +125°C ambient, −40°C to +150°C junction) and is manufactured under Automotive Quality Management System (AQMS) controls. It is approved for use in safety-critical automotive subsystems including ADAS, infotainment, and body electronics.
What current sensing methods does the LTC7819RUJ#PBF support?
The LTC7819RUJ#PBF supports both RSENSE (shunt resistor) and DCR (inductor winding resistance) current sensing across all three channels. Differential SENSE+ and SENSE− inputs provide ±3.5mV matching between channels, and the 50mV typical current sense threshold enables accurate, temperature-stable overcurrent protection without external amplification.
LTC7819RUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 3
- Output Phases:
- 3
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control, Power Good
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC7819RUJ#PBF FAQ
1.How can I place an order for LTC7819RUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7819RUJ#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 LTC7819RUJ#PBF reliable?
The price and inventory of LTC7819RUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7819RUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC7819RUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7819RUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7819RUJ#PBF?
LTC7819RUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7819RUJ#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 LTC7819RUJ#PBF?
For technical support, including LTC7819RUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7819RUJ#PBF requirements.
6.How does Aetrix verify that LTC7819RUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7819RUJ#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 LTC7819RUJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC7819RUJ#PBF?
All LTC7819RUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7819RUJ#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 LTC7819RUJ#PBF part is unused and in its original packaging.
Return procedure for LTC7819RUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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