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onsemi LV5851M-TLM-H
- Part No.:
- LV5851M-TLM-H
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
LV5851M-TLM-H.pdf
- Description:
- IC REG BUCK ADJ 3A 8MFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,858
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Product details
Overview
LV5851M-TLM-H from SANYO Semiconductor (now ON Semiconductor) is a synchronous step-down switching regulator IC with integrated high-side (60 mΩ) and low-side (30 mΩ) MOSFETs, supporting 5–18 V input and delivering up to 3 A output current at efficiencies exceeding 95%. It employs current-mode control, fold-back overcurrent protection, thermal shutdown (160 °C), and soft-start (7.5 ms) for stable power delivery in compact industrial DC/DC converters.
For engineers reviewing the LV5851M-TLM-H datasheet, pinout, applications, or equivalent options, key selection considerations include its MFP8 package, 350–600 kHz adjustable switching frequency, 0.835 V reference voltage, UVLO thresholds (4.65 V start / 4.3 V stop), and internal compensation-ready COMP pin for loop stability tuning.
Technical Context
This Bi-CMOS IC implements fixed-frequency current-mode PWM control with built-in oscillator (350–600 kHz), internal 0.835 V reference, and fold-back OCP that reduces switching frequency under overload to limit inductor current. The dual-MOSFET synchronous architecture eliminates external diode losses.
Thermal shutdown activates at 160 °C with 50 °C hysteresis; UVLO ensures clean startup above 4.65 V and graceful shutdown below 4.3 V. EN pin enables logic-level on/off control (2 V turn-on, 0.6 V turn-off), and FB pin supports adjustable output via resistor divider with ±1.2% reference tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5–18 V - Supports wide-range industrial 12 V bus and automotive battery-supplied systems. |
| Max Output Current | 3 A - Delivers full rated load without external MOSFETs or heatsinking on standard PCB. |
| Switching Frequency | 350–600 kHz - Enables use of small 4.7 µH inductors and ceramic output capacitors. |
| Reference Voltage | 0.835 V ±1.2% - Sets precise output voltage via FB divider; enables 3.3 V, 5 V, or custom outputs. |
| High-Side RDS(on) | 60 mΩ @ 12 V - Minimizes conduction loss during high-duty-cycle operation. |
| Low-Side RDS(on) | 30 mΩ @ 12 V - Reduces synchronous rectification loss, contributing to >95% peak efficiency. |
| Soft-Start Time | 7.5 ms typical - Prevents inrush current and output overshoot during power-up. |
Pinout & Package
Package: MFP8 (225 mil), 8-pin surface-mount, no exposed thermal pad. Dimensions: 6.4 mm × 5.0 mm × 1.7 mm max. Requires specified 31.0 × 34.0 × 1.7 mm glass-epoxy board for 1.0 W power dissipation rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | High-current return path for SW node; must be connected directly to AGND with low-inductance layout. |
| 2 (VIN) | Input Power Supply | Accepts 5–18 V; requires ≥30 µF ceramic capacitance (10 µF × 3) close to pin for 3 A operation. |
| 3 (AGND) | Analog Ground Reference | Reference for FB, COMP, and internal regulation; separate from PGND but electrically tied at single point. |
| 4 (FB) | Error Amplifier Inverting Input | Senses divided output voltage; regulates VOUT = 0.835 V × (1 + R1/R2); 80 nA bias current. |
| 5 (COMP) | Loop Compensation Node | Connects external RC network to stabilize feedback loop; sets phase margin and transient response. |
| 6 (EN) | Enable Control Input | Logic-compatible enable: ≥2 V = active, ≤0.6 V = shutdown; draws <180 µA in shutdown. |
| 7, 8 (SW) | Switch Node | Drives external inductor; carries pulsed high-current waveform; requires tight layout and Kelvin connection. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated 60 mΩ HS / 30 mΩ LS MOSFETs eliminate external Schottky loss and improve light-load efficiency. |
| Current-Mode Control | Enables fast load transient response and simplifies compensation design with single-pole dominant pole. |
| Fold-Back Overcurrent Protection | Reduces switching frequency under overload to limit peak inductor current and prevent thermal runaway. |
| Thermal Shutdown with Hysteresis | Shuts down at 160 °C and restarts only after cooling by ≥50 °C, preventing cycling near thermal limit. |
| UVLO with Hysteresis | Ensures reliable startup above 4.65 V and prevents brownout oscillation with 0.6 V hysteresis between turn-on/turn-off. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering 3.3 V microcontroller and CAN transceiver from 12 V vehicle battery with engine cranking dips. IC Role / Device Role / Timing Role: Primary 3 A buck regulator providing stable core voltage under dynamic load and wide input variation. Use Value: UVLO hysteresis (4.65 V / 4.3 V) avoids dropout during cold-crank; synchronous design sustains >90% efficiency at 1 A partial load. | Use Scenario: Generating 5 V rail for sensor interface and LED drivers in door module with space constraints. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter eliminating external FETs and diodes. Use Value: MFP8 footprint and integrated 30/60 mΩ switches reduce BOM count and PCB area vs. controller+external MOSFET solution. |
| Point-of-Load Converter for FPGA Core | Smart Home Hub Power Management |
Use Scenario: Delivering 1.2 V @ 2.5 A to FPGA core logic with tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: High-efficiency, current-mode regulated supply with programmable output via FB divider. Use Value: 0.835 V reference ±1.2% and current-mode control achieve <1% load regulation and <50 µs recovery from 50% load step. | Use Scenario: Powering Wi-Fi SoC, memory, and USB peripherals from 12 V wall adapter in compact enclosure. IC Role / Device Role / Timing Role: Main DC/DC regulator enabling fanless thermal design due to high efficiency and low thermal resistance. Use Value: >95% peak efficiency and 1.0 W allowable dissipation on standard FR4 allow continuous 3 A operation without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 40 V max input, 3 A, 500 kHz, 100 mΩ/70 mΩ MOSFETs, no fold-back OCP | Lacks fold-back protection; uses constant-current OCP with hiccup mode | Preferred where higher input voltage range (up to 40 V) is required, but less robust under sustained overload. |
| TPS54332DR | 28 V max input, 3 A, 600 kHz, external MOSFETs, 0.8 V ref, no integrated low-side FET | Requires external low-side MOSFET and driver; more flexible but larger solution size | Chosen when design requires adjustable frequency, external component optimization, or higher thermal headroom via discrete FETs. |
Compared with MP2315DJ-LF-Z and TPS54332DR, LV5851M-TLM-H offers superior integration (dual MOSFETs + fold-back OCP in MFP8), tighter reference accuracy (0.835 V ±1.2%), and optimized thermal performance for space-constrained 5–18 V industrial supplies-without requiring external components or sacrificing protection robustness.
Availability
LV5851M-TLM-H is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LV5851M-TLM-H 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
SANYO Semiconductor was a Japanese semiconductor manufacturer specializing in analog and power ICs, acquired by ON Semiconductor in 2011. Known for high-reliability Bi-CMOS process technology and automotive-grade power solutions.
The LV5851M-TLM-H belongs to SANYO's LV58xx series of monolithic synchronous buck regulators, designed specifically for compact, high-efficiency 3 A DC/DC conversion in industrial and automotive environments where board space and thermal management are critical.
FAQ
What is the maximum recommended output current for LV5851M-TLM-H under continuous operation?
The LV5851M-TLM-H is rated for up to 3 A continuous output current when mounted on the specified 31.0 × 34.0 × 1.7 mm glass-epoxy board and operated within ambient temperatures of –30 to 85 °C. Derating applies above 60 °C ambient; at 85 °C, maximum sustainable current drops to approximately 2.2 A due to thermal limits and 1.0 W allowable power dissipation.
Does LV5851M-TLM-H require an external compensation network, and where is it connected?
Yes, LV5851M-TLM-H requires an external RC compensation network connected to the COMP pin (Pin 5) to stabilize the feedback loop. The network typically includes a series RC from COMP to AGND and may include additional capacitor from COMP to FB, per the manufacturer's recommended type II or type III compensation design for current-mode converters.
What is the function of the dual SW pins (Pins 7 and 8) on LV5851M-TLM-H?
Pins 7 and 8 on LV5851M-TLM-H are internally bonded together as a single switch node (SW). This dual-pin configuration reduces parasitic inductance and improves current handling capability for the high-frequency, high-current switching waveform routed to the external inductor.
Can LV5851M-TLM-H operate with an input voltage lower than 5 V?
No, LV5851M-TLM-H has a minimum recommended operating input voltage of 5 V per its Recommended Operating Conditions. Although absolute maximum rating allows VIN down to –0.3 V, the UVLO circuit disables operation below ~4.3 V, and stable regulation is not guaranteed below 5 V due to insufficient headroom for internal regulation and gate drive.
How does the fold-back overcurrent protection in LV5851M-TLM-H differ from hiccup or latch-off modes?
The fold-back OCP in LV5851M-TLM-H reduces switching frequency under overload instead of shutting down. This lowers average inductor current and power dissipation while maintaining regulation, allowing safe operation during temporary overloads. Unlike hiccup (repeated restart attempts) or latch-off (requires reset), fold-back enables graceful current limiting without interrupting system operation.
LV5851M-TLM-H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.85V
- Voltage - Output (Max):
- 14.4V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MFP
LV5851M-TLM-H FAQ
1.How can I place an order for LV5851M-TLM-H through Aetrix?
Please submit a Request for Quotation (RFQ) for LV5851M-TLM-H 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 LV5851M-TLM-H reliable?
The price and inventory of LV5851M-TLM-H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LV5851M-TLM-H is usually 5 days.
3.What payment methods are accepted for LV5851M-TLM-H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LV5851M-TLM-H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LV5851M-TLM-H?
LV5851M-TLM-H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LV5851M-TLM-H 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 LV5851M-TLM-H?
For technical support, including LV5851M-TLM-H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LV5851M-TLM-H requirements.
6.How does Aetrix verify that LV5851M-TLM-H is sourced from the original manufacturer or authorized distributors?
All LV5851M-TLM-H 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 LV5851M-TLM-H meets industry standards.
7.What is the process for return or replacement of LV5851M-TLM-H?
All LV5851M-TLM-H units undergo pre-shipment inspection (PSI). If there is an issue with LV5851M-TLM-H, 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 LV5851M-TLM-H part is unused and in its original packaging.
Return procedure for LV5851M-TLM-H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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