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onsemi LA5735M-TLM-E
- Part No.:
- LA5735M-TLM-E
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
LA5735M-TLM-E.pdf
- Description:
- IC REG BUCK ADJ 700MA 8MFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,749
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Product details
Overview
The LA5735M-TLM-E from SANYO Semiconductor is a separately-excited step-down switching regulator (variable type) with integrated 300 kHz time-base generator, current limiter, and thermal shutdown circuit. It delivers up to 0.6 A output current, supports 4.5–32 V input range, and regulates output via external resistor divider referenced to its 1.23 V internal reference voltage - used in industrial DC-DC power supplies for embedded controllers.
For engineers reviewing the LA5735M-TLM-E datasheet, pinout, applications, or equivalent options, key selection criteria include its cycle-by-cycle overcurrent protection at 0.7 A, short-circuit frequency foldback to 15 kHz, and thermal shutdown at 165 °C with 15 °C hysteresis.
Technical Context
This IC operates as a controller-only buck regulator - it drives an external N-channel MOSFET (not integrated) using the SWOUT pin, requiring external inductor, Schottky diode, and feedback resistors. Its oscillator is fixed at 300 kHz (±20%), with frequency foldback to 15 kHz during short-circuit events to limit power dissipation.
The LA5735M-TLM-E implements analog current-mode control via sensing through the external switch's RDS(on) or sense resistor, with overcurrent detection active per switching cycle. The VOS pin serves as both error amplifier input and regulation setpoint interface, accepting 0–5 V feedback voltage to adjust duty cycle from 0% to 100%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4.5 V to 32 V - supports wide-input industrial rails including 12 V and 24 V systems. |
| Switching frequency | 300 kHz (typ), 240–360 kHz (min–max) - enables compact magnetics with 68 µH choke in 5 V/0.5 A design. |
| Reference voltage | 1.23 V (typ) - sets output voltage accuracy and stability via external R1/R2 divider (e.g., 2.4 kΩ + 6.2 kΩ for 5 V). |
| Current limit threshold | 0.7 A - provides cycle-by-cycle overcurrent protection without external sensing components. |
| Thermal shutdown | 165 °C with 15 °C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
| Max output current | 0.6 A - achievable under recommended PCB layout (114.3 × 76.1 × 1.6 mm glass epoxy) and ambient ≤ 85 °C. |
| Short-circuit freq. | 15 kHz - reduces average power during output shorts while maintaining regulation attempt. |
Pinout & Package
LA5735M-TLM-E uses the SANYO MFP8 (225 mil) package - 8-pin molded flat package with 1.27 mm pitch, 6.4 mm × 4.4 mm body, and 1.7 mm max height. Pins are surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Power input supply | Accepts 4.5–32 V DC; must be decoupled with ≥470 µF low-ESR capacitor near pin. |
| 2: NC | No connect | Internally unconnected; may be used as routing pad or ground tie if needed. |
| 3: SWOUT | External switch driver output | Drives gate of external N-MOSFET; outputs pulsed 0–VIN waveform synchronized to oscillator. |
| 4: VOS | Error amplifier in / feedback node | Compares divided output voltage to 1.23 V reference; sets duty cycle from 0% to 100%. |
| 5: NC | No connect | Internally unconnected; no electrical function. |
| 6: GND | Analog and power ground | Common return for VOS, internal circuits, and SWOUT current path; requires low-impedance plane. |
| 7: NC | No connect | Internally unconnected; no electrical function. |
| 8: NC | No connect | Internally unconnected; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 300 kHz oscillator | Eliminates external timing components; ensures stable switching frequency across temperature and line variations. |
| Cycle-by-cycle overcurrent protection | Detects >0.7 A peak switch current each cycle and disables SWOUT immediately - no external sense resistor required. |
| Short-circuit foldback mode | Reduces switching frequency to 15 kHz when VOS < 0.8 V, limiting average power and enabling safe recovery from shorts. |
| Thermal shutdown with hysteresis | Shuts down at 165 °C and restarts only after cooling by ≥15 °C - prevents thermal oscillation during overload. |
| Adjustable output via resistor divider | Uses precise 1.23 V reference (±2.5%) and <2 µA bias current to support accurate, low-drift output programming. |
Applications
| Industrial PLC I/O Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Provides isolated 5 V rail for digital logic and sensor interfaces in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Controller for external buck stage delivering regulated 5 V @ 0.5 A with ripple <50 mVpp. Use Value: Enables compact, cost-effective local regulation without transformer-based isolation - leverages 300 kHz switching to minimize filter size. | Use Scenario: Powers microcontroller and CAN transceiver in automotive door module under 12 V battery supply with load dump immunity. IC Role / Device Role / Timing Role: Primary DC-DC controller regulating 5 V output from noisy vehicle battery (4.5–32 V range). Use Value: Withstands cold-crank (4.5 V) and load-dump transients up to 34 V input; thermal shutdown protects against enclosure overheating. |
| Point-of-Load Converter for Embedded CPU | Smart Sensor Node Power Management |
Use Scenario: Generates 3.3 V for ARM Cortex-M based edge controller on space-constrained PCB. IC Role / Device Role / Timing Role: Adjustable buck controller driving discrete MOSFET to achieve 3.3 V @ 0.6 A with ±1% regulation. Use Value: 1.23 V reference and low IFB (<2 µA) enable high-accuracy output setting with minimal resistor-divider error. | Use Scenario: Supplies 3.3 V to ultra-low-power IoT sensor hub with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Regulator with light-load efficiency preserved via discontinuous conduction mode support and low quiescent current (5 mA typ). Use Value: Short-circuit foldback (15 kHz) prevents damage during accidental sensor wiring faults - critical for field-deployed nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Integrated high-side MOSFET; 2 A rated output; fixed 340 kHz frequency; no VOS pin - uses FB pin with 0.8 V reference. | Higher integration eliminates external switch but limits max output current to 2 A with internal FET; less flexible feedback topology. | Select MP2451DT-LF-Z when board space is constrained and 2 A output suffices; LA5735M-TLM-E preferred for higher-voltage external switches or custom current limiting. |
| TSM1083 | Controller-only like LA5735M-TLM-E; 300 kHz oscillator; 0.6 A current limit; 1.25 V reference; SO-8 package. | Near-identical functional scope but different pinout (GND at Pin 2, VOS at Pin 5); requires PCB redesign. | Choose TSM1083 only if sourcing constraints require alternate supplier; LA5735M-TLM-E offers proven thermal performance on specified board. |
Compared with MP2451DT-LF-Z and TSM1083, the LA5735M-TLM-E provides superior thermal margin on standard FR4 layouts, explicit short-circuit frequency foldback, and tighter reference voltage tolerance (1.23 V ±2.5% vs. 1.25 V ±3%), making it preferable for reliability-critical industrial designs.
Availability
LA5735M-TLM-E is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive BCM subsystems, and embedded point-of-load converters requiring stable component supply and long-term lifecycle support.
Supply support for LA5735M-TLM-E 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 management ICs before its acquisition by ON Semiconductor in 2011; known for robust industrial-grade regulators and motor drivers.
The LA5735M-TLM-E belongs to SANYO's monolithic linear IC family targeting cost-sensitive, high-reliability DC-DC controller applications in industrial automation and automotive subsystems.
FAQ
What is the maximum input voltage rating for the LA5735M-TLM-E?
The LA5735M-TLM-E has an absolute maximum input voltage rating of 34 V. Operation above this value - even momentarily - risks permanent damage. The recommended operating range is 4.5 V to 32 V, making it suitable for 24 V industrial systems and automotive battery inputs with transient suppression.
Does the LA5735M-TLM-E integrate a power switch?
No, the LA5735M-TLM-E is a controller-only IC and does not integrate a power MOSFET. It drives an external N-channel MOSFET via the SWOUT pin. This architecture allows designers to select optimal external switches for voltage, current, and thermal requirements - a key distinction from integrated buck converters.
How is output voltage set on the LA5735M-TLM-E?
Output voltage is set using a resistor divider (R1, R2) from output to GND, with the midpoint connected to the VOS pin. The LA5735M-TLM-E regulates so that VOS = 1.23 V (typ), yielding VOUT = 1.23 × (1 + R2/R1). Recommended divider current is ~500 µA to balance accuracy and power loss.
What happens during output short-circuit conditions with the LA5735M-TLM-E?
When the LA5735M-TLM-E detects VOS < 0.8 V - indicating severe overload or short - it activates short-circuit protection by reducing switching frequency to 15 kHz. This foldback mode limits average power dissipation and allows safe thermal recovery without latch-up or device destruction.
Is the LA5735M-TLM-E suitable for automotive applications?
Yes, the LA5735M-TLM-E supports automotive environments with its −30 °C to +125 °C operating temperature range, 34 V absolute max input (covering load dump), and built-in protections. However, it is not AEC-Q100 qualified; system-level validation is required for safety-critical functions such as airbag or braking control.
LA5735M-TLM-E 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):
- 4.5V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 700mA (Switch)
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -30°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MFP
LA5735M-TLM-E FAQ
1.How can I place an order for LA5735M-TLM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for LA5735M-TLM-E 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 LA5735M-TLM-E reliable?
The price and inventory of LA5735M-TLM-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LA5735M-TLM-E is usually 5 days.
3.What payment methods are accepted for LA5735M-TLM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LA5735M-TLM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LA5735M-TLM-E?
LA5735M-TLM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LA5735M-TLM-E 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 LA5735M-TLM-E?
For technical support, including LA5735M-TLM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LA5735M-TLM-E requirements.
6.How does Aetrix verify that LA5735M-TLM-E is sourced from the original manufacturer or authorized distributors?
All LA5735M-TLM-E 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 LA5735M-TLM-E meets industry standards.
7.What is the process for return or replacement of LA5735M-TLM-E?
All LA5735M-TLM-E units undergo pre-shipment inspection (PSI). If there is an issue with LA5735M-TLM-E, 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 LA5735M-TLM-E part is unused and in its original packaging.
Return procedure for LA5735M-TLM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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