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Analog Devices Inc. LT8350RV#PBF
- Part No.:
- LT8350RV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8350RV#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:537
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Product details
Overview
LT8350RV#PBF from Analog Devices is a monolithic 4-switch synchronous buck-boost DC/DC converter with Silent Switcher architecture, operating from 3V to 40V input and delivering up to 18V/6A output. It supports seamless transitions between buck, buck-boost, and boost regions while maintaining ±1.5% output voltage regulation and 95% efficiency at 2MHz switching frequency. Used in automotive voltage regulators and battery charger systems requiring high EMI immunity.
For engineers reviewing the LT8350RV#PBF datasheet, LT8350RV#PBF pinout, LT8350RV#PBF application, or LT8350RV#PBF equivalent, key selection criteria include its 32-pin LQFN package, AEC-Q100 qualification, integrated current monitor (ISP/ISN), programmable 200kHz–2MHz switching frequency, and dual CV/CC regulation capability.
Technical Context
The LT8350RV#PBF implements proprietary peak current mode control with dual comparators (A1 for buck, A2 for boost) and diode-OR'ed error amplifiers (EA1, EA2) enabling smooth region transitions. Its four internal N-channel DMOS switches-Switch A (VIN→SW1), B (SW1→GND), C (SW2→GND), D (VOUT→SW2)-are driven by integrated high-side gate drivers powered via BST1/BST2 bootstrap supplies.
Operation modes are selected via SYNC/MODE pin: external clock sync, spread-spectrum modulation (SSFM), or internal oscillator with pulse-skipping or forced CCM. Fault protection includes FB short-circuit detection (0.25V threshold), ISP/ISN overcurrent latch-off, and thermal shutdown with junction limit of 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide automotive battery transients and industrial input rails without pre-regulation. |
| Output Voltage Range | 1V to 18V - configurable via FB resistor divider; enables USB-PD source and supercapacitor charging. |
| Max Output Current | 6A peak - determined by 7.0A typical switch current limit (buck mode) and thermal design in 4mm × 6mm LQFN. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor or external SYNC; 2MHz operation enables compact 2.2µH inductor use. |
| Output Regulation Accuracy | ±1.5% - tight FB reference (1.00V typ) ensures stable CV operation across temperature and line/load variations. |
| EMI Performance | Silent Switcher architecture - minimizes PCB layout sensitivity and reduces conducted/radiated emissions without shielding. |
| AEC-Q100 Grade | Automotive qualified - rated for –40°C to +150°C junction temperature, supporting under-hood and infotainment applications. |
Pinout & Package
LT8350RV#PBF uses a 32-pin LQFN package (6mm × 4mm × 0.94mm) with exposed GND pads (pins 33–36) requiring soldering to PCB ground plane for thermal and EMI performance. Pin functions are validated per Analog Devices Rev. B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (2,3) | Main power input supply | Feeds internal circuitry and buck-side switches; requires local 10µF ceramic bypass to GND. |
| SW1 (31,32) | Buck-side switch node | Connects to internal Switch A/B; swings from ~–0.3V to VIN; requires Kelvin routing for low-noise current sensing. |
| SW2 (27,28) | Boost-side switch node | Connects to internal Switch C/D; swings from GND to VOUT+0.3V; critical for boost inductor placement. |
| ISP/ISN (11,12) | Differential current sense inputs | Measures V(ISP−ISN) across external RIS; supports ±1V common-mode range and 2300µS transconductance amplifier. |
| FB (14) | Voltage feedback input | Regulates output to 1.00V reference; triggers PGOOD (±10%) and FB short fault (0.25V) protection. |
| CTRL (13) | Current limit programming input | Sets full-scale ISP/ISN threshold from 0mV to 100mV linearly via external voltage (0.25V–1.35V). |
| PGOOD (16) | Open-drain power-good flag | Asserts low when FB is within ±10% of regulation; requires external pull-up for system sequencing. |
| LOADEN (8) | High-side PMOS load switch enable | Controls LOADTG gate drive; pulling low disconnects VC and disables all power switches. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Enables continuous regulation across VIN > VOUT, VIN = VOUT, and VIN < VOUT without mode switching artifacts. |
| Silent Switcher® EMI reduction | Integrated dual-loop layout and balanced switching edges reduce radiated emissions by >20dB vs conventional buck-boost. |
| Programmable CV/CC regulation | Simultaneous voltage loop (FB) and current loop (ISP/ISN) with shared VC compensation network for seamless transition. |
| Integrated load switch driver | LOADTG pin drives external high-side PMOS with rail-to-rail swing (VOUT−5V to VOUT), enabling controlled hot-swap and inrush limiting. |
| Robust fault management | Configurable short-circuit response (hiccup/latch-off/keep-running) via SS pin resistor; no external watchdog required. |
Applications
| Automotive Infotainment Power Supply | USB-PD Source Controller |
|---|---|
Use Scenario: Powers 12V display and audio subsystems from 8V–16V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 12V/3.3A with seamless dropout handling during engine start. Use Value: Eliminates need for separate buck + boost stages; Silent Switcher meets CISPR 25 Class 5 EMI limits without ferrite beads. | Use Scenario: Implements programmable 5V–20V output for USB Type-C PD negotiation in portable docking stations. IC Role / Device Role / Timing Role: Constant-voltage/constant-current source with precise 1.5% output accuracy and fast transient response (<50µs). Use Value: CTRL pin enables dynamic current limit adjustment per PD profile; 2MHz operation shrinks solution size by 40% vs 500kHz alternatives. |
| Industrial 24V Rail Stabilizer | Supercapacitor Backup Charger |
Use Scenario: Regulates unregulated 18V–36V factory floor supply to stable 24V for PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency (94% @ 2A) buck-boost converter with input current monitoring for overload diagnostics. Use Value: ISP/ISN current monitor provides real-time input power telemetry; AEC-Q100 rating ensures reliability in harsh environments. | Use Scenario: Charges 12V/10F supercapacitor bank from 12V main rail with precise 1.2A constant-current phase followed by 12.6V CV termination. IC Role / Device Role / Timing Role: Dual-loop charger IC using FB for voltage regulation and ISP/ISN for current regulation with automatic mode handoff. Use Value: Seamless buck-boost transition avoids voltage dip during capacitor charging; SS pin enables soft-start to limit inrush surge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | External MOSFET controller (no integrated switches); 4V–36V input; requires external gate drivers and loop compensation. | Better thermal scalability for >10A designs; lacks Silent Switcher EMI performance and integrated current monitor. | Select when higher output current or custom FET selection is required; not drop-in compatible due to different pinout and control architecture. |
| MPQ4333GR-A | Monolithic 3.5A buck-boost; 4V–36V input; 0.8V–25V output; no ISP/ISN current sense; no AEC-Q100 rating. | Lower cost for non-automotive consumer applications; lacks CV/CC dual-loop capability and SSFM noise reduction. | Choose for cost-sensitive industrial or telecom applications where EMI and automotive qualification are not required. |
Compared with LTC3780EFE#PBF and MPQ4333GR-A, the LT8350RV#PBF delivers integrated 6A switching, AEC-Q100 compliance, and Silent Switcher EMI performance in a single 32-pin LQFN - making it optimal for space-constrained automotive and high-reliability industrial systems requiring both voltage and current regulation.
Availability
LT8350RV#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, USB-PD source implementations, and industrial 24V rail stabilizers requiring stable component supply and long-term lifecycle support.
Supply support for LT8350RV#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 precision instrumentation, industrial automation, and automotive markets.
The LT8350 product line delivers high-efficiency, low-EMI buck-boost conversion for automotive and industrial applications where input voltage varies widely relative to output - designed specifically to replace multi-stage solutions with single-chip robustness.
FAQ
What is the maximum output current capability of the LT8350RV#PBF?
The LT8350RV#PBF supports up to 6A peak output current, limited by its internal 7.0A typical peak-buck current threshold and thermal performance in the 4mm × 6mm LQFN package. Continuous output current depends on PCB layout, ambient temperature, and airflow; at 2MHz switching with 2.2µH inductor, 3.3A continuous is achievable with 4-layer board and 200LFM airflow. The LT8350RV#PBF datasheet specifies 6A as the guaranteed peak switch current limit under defined test conditions.
Does the LT8350RV#PBF support spread-spectrum frequency modulation (SSFM)?
Yes, the LT8350RV#PBF supports SSFM when the SYNC/MODE pin is tied to INTVCC (mode 2) or VREF (mode 3). In SSFM mode, the switching frequency dithers ±23% around the nominal value set by the RT resistor, reducing peak EMI by spreading energy across a wider bandwidth. This feature is integral to the Silent Switcher architecture and requires no external components. The LT8350RV#PBF maintains regulation accuracy and transient response during SSFM operation.
How is current limit programmed on the LT8350RV#PBF?
Current limit on the LT8350RV#PBF is programmed via the CTRL pin voltage: IIS(MAX) = (MIN(VCTRL − 0.25V, 1V)) / (10 × RIS). Applying 2.0V to CTRL sets full-scale V(ISP−ISN) = 100mV, corresponding to 100mV/RIS current limit. A resistor divider from VREF (2.00V) to GND allows precise setting; e.g., 100kΩ/100kΩ yields 1.0V at CTRL for 50mV full-scale. The LT8350RV#PBF's ISP/ISN amplifier has 2300µS transconductance and ±1V common-mode range for accurate sensing.
Can the LT8350RV#PBF operate with input voltage below 3V?
No, the LT8350RV#PBF has a minimum specified input voltage of 3V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3V violates the guaranteed operating range and may result in improper startup, unstable regulation, or failure to engage the internal LDOs (INTVCC, VREF). The EN/UVLO threshold is 1.220V (falling), but VIN must remain ≥3V for functional operation. For sub-3V applications, consider alternative regulators such as the LT3990 or LTC3129. The LT8350RV#PBF is not characterized or warranted for operation below 3V.
What package type and thermal characteristics does the LT8350RV#PBF use?
The LT8350RV#PBF uses a 32-pin LQFN package (6mm × 4mm × 0.94mm) with exposed GND pads (pins 33–36) that must be soldered to the PCB ground plane. Its θJA is 23°C/W on a demo board (EVAL-LT8350-AZ), and the device is rated for –40°C to +150°C junction temperature. The exposed pad significantly improves thermal resistance and EMI performance. The LT8350RV#PBF includes overtemperature protection that latches off above 165°C junction, and continuous operation above 150°C may impair reliability.
LT8350RV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-TFQFN Exposed Pad, 28 Leads
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8350RV#PBF FAQ
1.How can I place an order for LT8350RV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8350RV#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 LT8350RV#PBF reliable?
The price and inventory of LT8350RV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8350RV#PBF is usually 5 days.
3.What payment methods are accepted for LT8350RV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8350RV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8350RV#PBF?
LT8350RV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8350RV#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 LT8350RV#PBF?
For technical support, including LT8350RV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8350RV#PBF requirements.
6.How does Aetrix verify that LT8350RV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8350RV#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 LT8350RV#PBF meets industry standards.
7.What is the process for return or replacement of LT8350RV#PBF?
All LT8350RV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8350RV#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 LT8350RV#PBF part is unused and in its original packaging.
Return procedure for LT8350RV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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