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Analog Devices Inc. LT8350SAV#PBF
- Part No.:
- LT8350SAV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8350SAV#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:925
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Product details
Overview
LT8350SAV#PBF 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 continuous output current at up to 95% efficiency and 2MHz switching frequency. It enables seamless voltage regulation in automotive USB-PD sources where VIN may be above, below, or equal to VOUT.
For engineers reviewing the LT8350SAV#PBF datasheet, LT8350SAV#PBF pinout, LT8350SAV#PBF application, or LT8350SAV#PBF equivalent, key selection considerations include its ±1.5% output voltage regulation, integrated current monitor (ISMON), AEC-Q100 qualification, 32-pin LQFN package, and dual constant-voltage/constant-current regulation capability.
Technical Context
The LT8350SAV#PBF implements proprietary peak current mode control with dual comparators (A1 for buck, A2 for boost) and diode-OR'ed error amplifiers (EA1/EA2) to ensure smooth transitions across buck, buck-boost, and boost regions. Its four-NMOS switch topology eliminates top-MOSFET refresh noise and supports bidirectional current sensing via ISP/ISN with 100mV full-scale threshold.
It integrates two bootstrap drivers (BST1/BST2), internal 3.6V INTVCC LDO, 2V VREF reference, and programmable soft-start via SS pin. The device features spread-spectrum frequency modulation (SSFM), external synchronization (SYNC/MODE), and robust fault protection including PGOOD flag, FB short detection, and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide-range inputs including 12V/24V automotive batteries and industrial rails. |
| Output Voltage Range | 1V to 18V - configurable via FB resistor divider for USB-PD, battery charging, or supercapacitor biasing. |
| Max Output Current | 6A continuous - enabled by low RDS(ON) switches (30–50mΩ) and thermally optimized 4mm × 6mm LQFN package. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor; 2MHz operation enables compact magnetics and high-frequency EMI filtering. |
| Output Regulation Accuracy | ±1.5% - ensures stable power delivery under load/line/temp variations for precision analog or digital loads. |
| Current Sense Accuracy | ±3% full-scale (97–103mV) - enables accurate constant-current regulation for LED drivers or battery charge control. |
| EMI Performance | Silent Switcher® 2 architecture - minimizes PCB-level radiated emissions without requiring complex shielding or layout constraints. |
Pinout & Package
LT8350SAV#PBF is housed in a thermally enhanced 32-pin LQFN package (4mm × 6mm × 0.94mm) with exposed GND pads (pins 33–36) soldered directly to the PCB ground plane for optimal thermal dissipation (θJA = 19°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 2,3) | Main input supply rail | Bypassed to GND with ceramic capacitor; powers internal circuitry and buck-side switches. |
| VOUT (pins 24,25) | Regulated output rail | Connects to output filter and LOADTG drive rail; supports up to 18V and 6A continuous. |
| ISP/ISN (pins 11,12) | Differential current sense inputs | Kelvin-connected to sense resistor; enables precise input/output current monitoring and CC regulation. |
| FB (pin 14) | Voltage feedback input | Compares output against 1.00V internal reference; sets output voltage via external resistor divider. |
| CTRL (pin 13) | Current limit programming input | Accepts 0–2V signal to set ISP/ISN regulation threshold (e.g., 2V = 100mV full-scale = 6A at 10mΩ). |
| PGOOD (pin 16) | Open-drain power-good flag | Pulled low when FB is within ±10% of target; requires external pull-up for system sequencing or fault reporting. |
| SW1 (pins 31,32) | Buck-side switch node | Connects to internal NMOS A/B; swings from ~–0.3V to VIN - requires low-inductance routing. |
| SW2 (pins 27,28) | Boost-side switch node | Connects to internal NMOS C/D; swings from GND to ~VOUT + 0.3V - critical for boost path integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Enables buck, buck-boost, and boost operation without external topology changes - ideal for variable-input systems like automotive start-stop or solar MPPT interfaces. |
| Silent Switcher® 2 EMI reduction | Integrated dual-loop hot-loop layout and balanced power stages reduce radiated emissions by >20dB vs. prior generation - simplifies CISPR-25 Class 5 compliance. |
| Constant-voltage / constant-current regulation | Simultaneous FB-based voltage loop and ISP/ISN-based current loop allow seamless transition between CV and CC modes - essential for USB-PD sink/source negotiation. |
| High-side PMOS load switch driver | LOADEN/LOADTG pins drive external PMOS to disconnect VOUT from VIN during shutdown - prevents backfeed and meets automotive reverse-battery requirements. |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C junction temperature with built-in overtemperature protection - validated for under-hood automotive applications. |
Applications
| Automotive USB-PD Source | Battery Charger with Input Current Limit |
|---|---|
Use Scenario: 12V vehicle battery powering USB-C PD port delivering 9V/3A or 15V/3A to laptops and peripherals. IC Role / Device Role: Primary buck-boost regulator managing dynamic VIN/VOUT relationships while enforcing strict input current limits per USB-PD spec. Use Value: Maintains regulated output despite engine cranking dips (VIN down to 3V) or alternator surges (VIN up to 40V), with ±1.5% accuracy and <10µs fault response. |
Use Scenario: Charging 3S Li-ion battery (12.6V max) from variable 9–36V DC source with programmable input current cap to avoid overloading upstream supply. IC Role / Device Role: Dual-loop controller regulating VOUT to battery voltage while limiting ISP current to protect source and meet JEITA thermal profiles. Use Value: Eliminates need for separate current-limit IC; ISMON provides real-time current telemetry for host MCU monitoring and safety cutoff. |
| Industrial 24V Rail Stabilizer | Supercapacitor Backup Power Manager |
Use Scenario: Stabilizing unregulated 18–32V industrial bus to clean 24V output for PLC I/O modules and sensors. IC Role / Device Role: High-efficiency (95% @ 2MHz) buck-boost regulator compensating for line drop and load transients without polarity reversal. Use Value: Delivers 6A at 24V with <50mV load regulation and no external MOSFETs - reduces BOM count and improves MTBF vs. discrete solutions. |
Use Scenario: Bidirectional power management between 24V main rail and 12V supercapacitor bank for ride-through during AC failure. IC Role / Device Role: Reversible buck-boost controller charging supercaps in boost mode and discharging in buck mode with identical current sensing path. Use Value: Single-chip solution replaces dual converters; ISP/ISN monitors charge/discharge current with ±3% accuracy for state-of-charge estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8350HV#PBF | Wider 3V–60V input range; same 1V–18V output, 6A rating, and pinout; higher BST1 rating (60V vs. 47V). | Required for 48V telecom or heavy-duty vehicle systems where transient spikes exceed 40V. | Select LT8350HV#PBF only if input must withstand >40V transients; otherwise LT8350SAV#PBF offers better cost/performance for 12V/24V automotive. |
| MP2918GL-Z | 3V–36V input, 0.8V–20V output, 5A max; lacks ISP/ISN current monitor, SSFM, and AEC-Q100 qualification. | Suitable for cost-sensitive industrial SMPS but not automotive or USB-PD due to missing current regulation and EMI features. | Choose MP2918GL-Z only for non-automotive, non-USB-PD applications where current monitoring and EMI are secondary concerns. |
Compared with LT8350HV#PBF, LT8350SAV#PBF trades 20V input headroom for tighter thermal design and lower cost in 12V/24V systems; compared with MP2918GL-Z, it adds critical USB-PD and automotive features - including AEC-Q100, ISMON, and Silent Switcher® 2 - at modest BOM premium.
Availability
LT8350SAV#PBF is available at Aetrix Electronics and suitable for automotive USB-PD designs, industrial 24V rail stabilization, and supercapacitor backup power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8350SAV#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, Inc. 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, sensing, and timing solutions.
The LT8350SAV#PBF belongs to Analog Devices' Silent Switcher® 2 buck-boost product line, engineered specifically for high-reliability, low-EMI power conversion in space-constrained automotive and industrial environments where input voltage varies widely.
FAQ
What is the maximum junction temperature rating for the LT8350SAV#PBF?
The LT8350SAV#PBF has a maximum operating junction temperature of 125°C and includes overtemperature protection that activates above 150°C. Its thermal design supports θJA = 19°C/W on a 4-layer board, enabling reliable 6A operation in ambient temperatures up to 85°C when properly heatsinked. The LT8350SAV#PBF datasheet specifies derating curves for continuous current vs. TA.
Does the LT8350SAV#PBF support spread-spectrum frequency modulation (SSFM)?
Yes, the LT8350SAV#PBF supports SSFM when the SYNC/MODE pin is driven to 3.6V, spreading the oscillator frequency by ±23% to reduce peak EMI emissions. This feature is part of its Silent Switcher® 2 architecture and does not require external components - unlike traditional dithering circuits - making it effective for meeting CISPR-25 Class 5 requirements in automotive applications.
Can the LT8350SAV#PBF regulate both output voltage and output current simultaneously?
Yes, the LT8350SAV#PBF implements true dual-loop regulation: the FB pin controls output voltage (CV mode), while the ISP/ISN differential inputs and CTRL pin set output current limit (CC mode). During overload, it seamlessly transitions from CV to CC without latch-off, maintaining regulation - a core capability confirmed in the LT8350SAV#PBF datasheet's "Constant-Voltage/Constant-Current Regulation" feature list.
What is the purpose of the LOADEN and LOADTG pins on the LT8350SAV#PBF?
The LOADEN pin enables/disables an integrated high-side PMOS load switch driver; when pulled high, it activates LOADTG - which outputs a buffered, inverted version of LOADEN referenced to VOUT. This allows controlled disconnection of VOUT from downstream loads during shutdown, preventing backfeed and satisfying automotive reverse-battery test requirements. The LT8350SAV#PBF datasheet confirms LOADTG swing ranges from (VOUT−5V) to VOUT.
Is the LT8350SAV#PBF pin-compatible with other members of the LT8350 family?
Yes, the LT8350SAV#PBF shares identical pinout, package, and footprint with LT8350HV#PBF and LT8350#PBF. All three variants use the same 32-pin LQFN (4mm × 6mm) and maintain register- and function-level compatibility - enabling drop-in replacement where input voltage range or thermal specs align. This pin compatibility is explicitly documented in the LT8350SAV#PBF package drawings and pin descriptions table.
LT8350SAV#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8350SAV#PBF FAQ
1.How can I place an order for LT8350SAV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8350SAV#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 LT8350SAV#PBF reliable?
The price and inventory of LT8350SAV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8350SAV#PBF is usually 5 days.
3.What payment methods are accepted for LT8350SAV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8350SAV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8350SAV#PBF?
LT8350SAV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8350SAV#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 LT8350SAV#PBF?
For technical support, including LT8350SAV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8350SAV#PBF requirements.
6.How does Aetrix verify that LT8350SAV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8350SAV#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 LT8350SAV#PBF meets industry standards.
7.What is the process for return or replacement of LT8350SAV#PBF?
All LT8350SAV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8350SAV#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 LT8350SAV#PBF part is unused and in its original packaging.
Return procedure for LT8350SAV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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