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Analog Devices Inc. LT8350SAV#WPBF
- Part No.:
- LT8350SAV#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8350SAV#WPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:448
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Product details
Overview
LT8350SAV#WPBF from Analog Devices is a monolithic 4-switch synchronous buck-boost DC/DC converter with Silent Switcher® 2 architecture, supporting 3V–40V input and 1V–18V output, delivering up to 6A output current with ±1.5% voltage regulation and AEC-Q100 qualification for automotive systems.
For engineers reviewing the LT8350SAV#WPBF datasheet, LT8350SAV#WPBF pinout, LT8350SAV#WPBF application, or LT8350SAV#WPBF equivalent, key selection considerations include its 4-switch single-inductor topology enabling seamless VIN-above/VIN-below-VOUT operation, integrated current monitoring (ISP/ISN), high-side PMOS load switch driver (LOADEN/LOADTG), and 200kHz–2MHz programmable switching frequency with SSFM support.
Technical Context
The LT8350SAV#WPBF implements proprietary peak current mode control with dual comparators (A1 for buck, A2 for boost) and diode-OR'ed error amplifiers (EA1/EA2) to enable smooth transitions across buck, buck-boost, and boost regions without audible noise or voltage glitches. Its four internal N-channel DMOS switches are driven by floating bootstrap supplies (BST1/BST2), with dedicated charge paths ensuring reliable top-FET biasing in all operating modes.
It integrates dual regulation loops: a voltage loop (FB pin, 1.00V reference, ±0.2% line/load regulation) and a current loop (CTRL pin, 100mV full-scale ISP/ISN threshold, 2300µS transconductance), plus independent fault protection including PGOOD (±10% FB window), FB short detection (0.23V threshold), and thermal shutdown (125°C max junction).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide-range battery inputs (12V/24V automotive, 5V–36V industrial) without external pre-regulation |
| Output Voltage Range | 1V to 18V - configurable via FB resistor divider; enables USB-PD source, supercapacitor charging, and variable-rail systems |
| Max Output Current | 6A - peak-buck current limit 7.0A typ, peak-boost 7.0A typ; delivers ≥24W at 12V/2A with 95% efficiency @2MHz |
| Switching Frequency | 200kHz to 2MHz - set by RT resistor or synchronized externally; SSFM option reduces EMI peaks for CISPR-25 Class 5 compliance |
| Output Voltage Accuracy | ±1.5% - includes temp drift (±0.02% over –40°C to 125°C); ensures stable rail for ADC references and precision analog circuits |
| Current Sense Accuracy | ±3% full-scale - 100mV ISP/ISN threshold with 97–103mV tolerance; enables accurate constant-current LED/battery charging |
| Thermal Rating | Junction temp max 125°C - AEC-Q100 Grade 1 qualified; supports under-hood automotive use with θJA = 19°C/W on 4-layer board |
Pinout & Package
LT8350SAV#WPBF 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 2,3) | Main power input | Bypassed to GND with ceramic capacitor; powers internal circuitry and buck-side switches; withstands 42V abs max |
| EN/UVLO (pin 5) | Enable & UVLO input | 0.6V typical enable threshold with 15mV hysteresis; enables system-level sequencing and brownout protection |
| ISP/ISN (pins 11,12) | Differential current sense inputs | Kelvin-connected to sense resistor; supports bidirectional current monitoring with 0–40V common-mode range |
| FB (pin 14) | Voltage feedback input | 1.00V regulation reference; connects to resistor divider from VOUT; enables precise CV regulation and OVP/UVP fault detection |
| LOADEN (pin 8) | Load switch control | 1.5V rising threshold; controls external high-side PMOS via LOADTG; disconnects VOUT from VIN during shutdown |
| PGOOD (pin 16) | Open-drain power-good flag | Pulled low when FB is within ±10% of target; requires external pull-up; signals system MCU when output is stable |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor buck-boost topology | Eliminates need for separate buck + boost stages; enables compact, low-BOM designs for variable-input systems |
| Silent Switcher® 2 architecture | Integrated copper caps and symmetrical layout reduce EMI emissions by >30dB vs conventional buck-boost ICs |
| Constant-voltage / constant-current regulation | Simultaneous FB and CTRL loop control enables battery charging, LED drivers, and programmable current sources |
| High-side PMOS load switch driver | LOADTG provides rail-to-rail gate drive (VOUT−5V to VOUT); supports hot-swap and inrush control without external FET drivers |
| Spread spectrum frequency modulation (SSFM) | VSYNC/MODE = 3.6V enables ±23% frequency dithering; lowers peak EMI without sacrificing efficiency or transient response |
Applications
| Automotive USB-PD Source | Industrial 24V Rail Regulator |
|---|---|
Use Scenario: In-vehicle infotainment system requiring 9V–20V USB-PD output from 9V–16V battery input with EMI compliance. IC Role / Device Role / Timing Role: Primary buck-boost regulator with CV/CC control, PGOOD signaling, and SSFM for CISPR-25 Class 5 certification. Use Value: Delivers 6A at 15V with <10mV ripple and <100ns transient recovery; eliminates need for secondary DC/DC stage. | Use Scenario: Programmable logic controller (PLC) backplane supplying 12V/5A from 24V industrial bus with reverse polarity and overcurrent protection. IC Role / Device Role / Timing Role: Input-to-output voltage regulator with ISP/ISN current limiting, LOADEN-controlled hot-swap, and thermal foldback. Use Value: Provides ±1.5% output accuracy over –40°C to 85°C ambient; detects and latches off on 6.5A overload in <1µs. |
| Supercapacitor Backup Charger | Telecom 48V Intermediate Bus Converter |
Use Scenario: Energy harvesting node using 3.3V–5V solar input to charge 2.7V/10F supercapacitor bank with precise current limiting. IC Role / Device Role / Timing Role: Constant-current charger with programmable 100mV ISP/ISN threshold, soft-start (SS pin), and VOUT-disconnect-on-shutdown. Use Value: Achieves 94% efficiency at 1A/2.7V; prevents reverse discharge during input dropout via controlled shutdown sequence. | Use Scenario: Optical line terminal (OLT) requiring isolated 12V/3A from 48V telecom rectified bus with low-noise operation near sensitive RF receivers. IC Role / Device Role / Timing Role: Non-isolated intermediate bus converter operating in buck-boost region (VIN ≈ VOUT) with Silent Switcher 2 EMI suppression. Use Value: Meets EN55022 Class B conducted EMI limits at 2MHz switching; maintains <5mV pk-pk output noise at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | External MOSFET controller (no integrated switches); wider 4V–36V input; no integrated current monitor or SSFM | Requires external high-side/lower FETs and gate drivers; better for >10A or custom thermal layout | Choose LTC3789EFE#PBF when higher current (>8A), discrete FET optimization, or multi-phase scaling is required |
| MPQ4282GJ-AEC1-Z | 3.3V–40V input; 0.8V–25V output; 5A max; no integrated current sense amplifier or LOADEN driver | Lacks ISP/ISN monitoring and high-side load switch control; simpler CV-only regulation | Choose MPQ4282GJ-AEC1-Z for cost-sensitive AEC-Q100 automotive apps where current monitoring is handled externally |
Compared with LTC3789EFE#PBF and MPQ4282GJ-AEC1-Z, the LT8350SAV#WPBF uniquely integrates current sensing, load switch control, and SSFM in a single 4mm×6mm package-reducing component count by 7+ parts while maintaining AEC-Q100 compliance and sub-100mV output ripple.
Availability
LT8350SAV#WPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power rails, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualification.
Supply support for LT8350SAV#WPBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8350SAV#WPBF belongs to ADI's Silent Switcher® 2 power management portfolio, designed specifically for noise-sensitive applications demanding high efficiency, ultra-low EMI, and robust operation across wide input/output ranges in harsh environments.
FAQ
What is the maximum junction temperature specification for the LT8350SAV#WPBF?
The LT8350SAV#WPBF has a maximum operating junction temperature of 125°C, consistent with its AEC-Q100 Grade 1 qualification. It includes overtemperature protection that activates above 150°C to prevent permanent damage. Thermal design must ensure θJA ≤ 19°C/W on a 4-layer board to maintain reliability under full 6A load at 85°C ambient.
Does the LT8350SAV#WPBF support synchronization to an external clock signal?
Yes, the LT8350SAV#WPBF supports external clock synchronization via the SYNC/MODE pin, accepting 200kHz–2MHz input signals. This enables phase alignment with other regulators to reduce system-level EMI and avoid beat frequencies. The pin also selects five operation modes including SSFM, burst mode, and forced continuous conduction.
How does the LT8350SAV#WPBF implement constant-current regulation?
The LT8350SAV#WPBF implements constant-current regulation using the ISP/ISN differential inputs and CTRL pin. With VCTRL set to 2V, it regulates V(ISP–ISN) to 100mV ±3%, corresponding to a precise current threshold. The ISMON pin outputs a buffered 10×(VISP–VISN) + 0.25V signal for external monitoring, enabling closed-loop CC control in battery chargers and LED drivers.
Can the LT8350SAV#WPBF operate with input voltage equal to output voltage?
Yes, the LT8350SAV#WPBF operates seamlessly in buck-boost region where VIN ≈ VOUT, using adaptive peak-buck or peak-boost control depending on the exact ratio. Its 4-switch architecture avoids discontinuities or efficiency drops at unity gain, delivering >92% efficiency at 12V input/output with 2A load and 2MHz switching.
What is the purpose of the LOADEN and LOADTG pins on the LT8350SAV#WPBF?
The LOADEN pin (pin 8) enables or disables the high-side PMOS load switch, while LOADTG (pin 22) drives its gate with a buffered, inverted signal. When LOADEN is high, LOADTG swings from (VOUT−5V) to VOUT, allowing controlled hot-swap, inrush limiting, and VOUT disconnection during shutdown - critical for automotive and industrial safety-critical subsystems.
LT8350SAV#WPBF 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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8350SAV#WPBF FAQ
1.How can I place an order for LT8350SAV#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8350SAV#WPBF 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 LT8350SAV#WPBF reliable?
The price and inventory of LT8350SAV#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8350SAV#WPBF is usually 5 days.
3.What payment methods are accepted for LT8350SAV#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8350SAV#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8350SAV#WPBF?
LT8350SAV#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8350SAV#WPBF 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 LT8350SAV#WPBF?
For technical support, including LT8350SAV#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8350SAV#WPBF requirements.
6.How does Aetrix verify that LT8350SAV#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8350SAV#WPBF 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 LT8350SAV#WPBF meets industry standards.
7.What is the process for return or replacement of LT8350SAV#WPBF?
All LT8350SAV#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8350SAV#WPBF, 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 LT8350SAV#WPBF part is unused and in its original packaging.
Return procedure for LT8350SAV#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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