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onsemi CS51411EDR8G
- Part No.:
- CS51411EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51411EDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,583
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Product details
Overview
CS51411EDR8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, 4.5–40 V input range, and synchronization capability. It integrates an on-chip NPN power switch, supports external BOOST capacitor for saturation optimization, and delivers ultrafast transient response in industrial power supplies and embedded DC/DC converters.
For engineers reviewing the CS51411EDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 260 kHz switching frequency, SYNC input for noise-sensitive multi-rail systems, thermal shutdown at 175–195 °C, 0.29 V frequency foldback threshold, and SOIC-8 package compatibility with LT1375.
Technical Context
The CS51411EDR8G implements V² control architecture, where both PWM comparator inputs derive from the output voltage-fast feedback (AC + DC) and slow feedback (error amplifier output)-enabling transient response independent of error amplifier bandwidth. Its oscillator is factory-trimmed to 260 kHz ±13% with line regulation of 0.05–0.15 %/V.
It features cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback to 65 kHz under short-circuit (VFB < 0.29 V), and integrated soft-start via VC pin compensation. The BOOST pin provides bootstrapped base drive to minimize saturation voltage (0.4–1.0 V at 1.5 A), while SHDNB enables TTL-compatible active-low shutdown with ≤85 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal (224–296 kHz); enables compact magnetics and EMI filtering for space-constrained designs. |
| Input Voltage Range | 4.5 V to 40 V; supports wide-input industrial and automotive battery-fed applications without pre-regulation. |
| Output Current | 1.5 A continuous; limited by on-chip NPN transistor with external BOOST capacitor for saturation control. |
| Frequency Foldback Threshold | 0.29–0.36 V on VFB pin; triggers 4:1 frequency reduction and current limit foldback during overload/short circuit. |
| Saturation Voltage | 0.4–1.0 V at IOUT = 1.5 A with VBOOST = VIN + 2.5 V; directly reduces conduction loss and junction temperature rise. |
| Shutdown Quiescent Current | 20–85 µA; ensures minimal system standby power draw when SHDNB is pulled low. |
| Thermal Shutdown Trip | 175–195 °C; protects device under sustained overload or poor heatsinking conditions. |
Pinout & Package
CS51411EDR8G is housed in an SOIC-8 (Case 751) package with 1.27 mm pitch, Pb-free finish, and moisture sensitivity level 1. Thermal pad is not present; standard SOIC thermal performance applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive supply | Provides elevated base drive voltage to internal NPN switch; connects to external diode+capacitor network to reduce VCE(sat) and improve efficiency. |
| 2,3,4: VIN | Main power input | Supplies power to internal circuitry and collector of NPN switch; accepts 4.5–40 V with −0.3 V absolute minimum rating. |
| 5,6,7: VSW | Switch emitter node | Connects to inductor; swings negative up to −1.0 V for <50 ns; requires external catch diode and low-inductance PCB layout. |
| 8: SHDNB | Active-low shutdown | TTL-compatible input with internal pull-up; pulls below 1.0 V to enter sleep mode (<85 µA IQ). |
| NC (pins 9,11,12,14,15,18) | No connection | Not bonded; must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers ultrafast load transient response independent of error amplifier bandwidth; simplifies loop compensation with single-pole dominant pole. |
| SYNC input (pin 5) | Accepts external 305–470 kHz clock to synchronize multiple regulators, reducing beat frequencies and EMI peaks in multi-rail systems. |
| Frequency and current foldback | Reduces switching frequency to 65 kHz and limits peak current to ~1 A when VFB drops below 0.29 V-minimizing power dissipation during short circuits. |
| Soft-start via VC pin | Uses internal error amplifier source current (15–35 µA) charging external VC-to-GND capacitor to ramp output voltage gradually-no dedicated SS pin required. |
| Thermal shutdown with hysteresis | Trips at 175–195 °C with 42 °C hysteresis; prevents thermal runaway and enables automatic recovery after cooling. |
Applications
| Industrial Motor Control Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Provides regulated 5 V or 3.3 V rail for microcontrollers, CAN transceivers, and sensor interfaces in motor drive enclosures with 12–24 V battery input and high ambient temperature. IC Role / Device Role / Timing Role: Primary buck controller managing power conversion; V² control ensures stable output during rapid motor start/stop transients. Use Value: 260 kHz switching allows small 10–22 µH inductors; BOOST pin minimizes conduction loss at 85 °C ambient, extending reliability over 10-year field life. | Use Scenario: Powers infotainment subsystems and lighting drivers from vehicle battery (9–16 V) with strict EMI requirements and need for synchronized switching across multiple rails. IC Role / Device Role / Timing Role: Synchronized buck regulator operating in phase with other CS5141X devices to suppress conducted EMI at fundamental and harmonic frequencies. Use Value: SYNC pin enables deterministic timing alignment; 0.29 V foldback threshold protects against lamp filament inrush without requiring external current sense. |
| Point-of-Load Converter for FPGA I/O Banks | Programmable Logic Controller (PLC) Field Power |
Use Scenario: Generates 1.2 V or 1.8 V for FPGA I/O banks from intermediate 5 V or 12 V rail in programmable logic systems with dynamic load steps up to 1 A/µs. IC Role / Device Role / Timing Role: High-bandwidth point-of-load regulator using V² architecture to maintain <±1% regulation during fast digital load transients. Use Value: Ultrafast transient response eliminates need for large bulk capacitance; SOIC-8 footprint allows placement near FPGA BGA for lowest possible loop inductance. | Use Scenario: Supplies 24 V to 5 V conversion for PLC digital I/O modules exposed to industrial 24 V DC bus with voltage surges and wide temperature variation (−40 to 85 °C). IC Role / Device Role / Timing Role: Robust primary DC/DC stage handling input transients up to 40 V; thermal shutdown and cycle-by-cycle current limiting ensure fault tolerance. Use Value: 40 V absolute maximum VIN rating and 175–195 °C thermal trip enable operation without external TVS clamping in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1375CS8#PBF | Pin-compatible, 1.5 A, 250 kHz; no V² control, uses voltage-mode PWM; higher quiescent current (6 mA vs. 6.25 mA typical). | Lacks frequency foldback and SYNC; less robust under short-circuit; requires more complex compensation. | Select when legacy design reuse is critical and V² benefits are non-essential. |
| MP2307DS-LF-Z | 1.2 A, 340 kHz; integrated MOSFETs (not bipolar); no BOOST or SYNC pins; different pinout and control architecture. | Higher switching frequency enables smaller inductors but lacks synchronization and bootstrap optimization for high-efficiency bipolar operation. | Select for cost-sensitive, lower-current applications where SOIC-8 footprint is acceptable but V² and BOOST are not required. |
Compared with LT1375CS8#PBF, CS51411EDR8G offers superior transient response and built-in protection; compared with MP2307DS-LF-Z, it provides higher current capability, external BOOST flexibility, and precise synchronization-making it optimal for thermally demanding, noise-sensitive industrial buck designs.
Availability
CS51411EDR8G is available at Aetrix Electronics and suitable for industrial motor control power supplies, automotive body control modules, FPGA point-of-load converters, and programmable logic controller field power requiring stable component supply and long-term lifecycle support.
Supply support for CS51411EDR8G 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
onsemi is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The CS5141X product line was designed specifically for high-reliability, wide-input-voltage buck conversion in industrial and automotive environments-emphasizing robustness, thermal resilience, and simplified design through V² control and integrated protection.
FAQ
What is the maximum input voltage rating for CS51411EDR8G?
The CS51411EDR8G has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation above this level risks permanent damage. The device is specified for continuous operation from 4.5 V to 40 V, making it suitable for 24 V industrial buses and 12 V automotive systems with surge tolerance. Always observe the −0.3 V minimum rating to avoid reverse-bias stress.
Does CS51411EDR8G require an external BOOST capacitor, and why?
Yes, CS51411EDR8G requires an external BOOST capacitor (typically 0.1 µF) connected via a diode from VOUT or another supply to the BOOST pin. This capacitor provides elevated base drive voltage to the internal NPN transistor during turn-on, ensuring deep saturation and minimizing VCE(sat). Without it, conduction losses increase significantly-especially at high input voltages-reducing efficiency and raising junction temperature.
How does the SYNC function work on CS51411EDR8G, and what is its valid frequency range?
The SYNC pin (pin 5) on CS51411EDR8G accepts an external TTL-compatible clock signal to synchronize switching across multiple regulators. It operates within 305–470 kHz for the CS51411/CS51412 variants. A rising edge triggers the next switching cycle with ~0.5 µs delay. During sync mode, frequency foldback is disabled-ensuring consistent timing even under fault conditions.
What happens to CS51411EDR8G during a short-circuit condition at the output?
When the VFB pin voltage falls below 0.29 V, CS51411EDR8G initiates protection: switching frequency drops to ~65 kHz (¼ nominal), peak current limit folds back to ~1 A, and duty cycle is constrained. This reduces power dissipation in both the IC and external components. The device remains operational-recovering automatically once VFB rises above 0.36 V-without latching off or requiring reset.
Is CS51411EDR8G pin-compatible with any industry-standard alternatives?
Yes, CS51411EDR8G is functionally pin-compatible with the Linear Technology LT1375 in SOIC-8 package. Pin mapping matches exactly for BOOST, VIN, VSW, SHDNB, GND, VFB, VC, and SYNC. However, CS51411EDR8G adds V² control, tighter frequency tolerance, and enhanced foldback protection-making it a direct drop-in upgrade where improved transient response and fault resilience are needed.
CS51411EDR8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 40V
- Voltage - Output (Min/Fixed):
- 1.27V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51411EDR8G FAQ
1.How can I place an order for CS51411EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411EDR8G 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 CS51411EDR8G reliable?
The price and inventory of CS51411EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411EDR8G is usually 5 days.
3.What payment methods are accepted for CS51411EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411EDR8G?
CS51411EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411EDR8G 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 CS51411EDR8G?
For technical support, including CS51411EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411EDR8G requirements.
6.How does Aetrix verify that CS51411EDR8G is sourced from the original manufacturer or authorized distributors?
All CS51411EDR8G 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 CS51411EDR8G meets industry standards.
7.What is the process for return or replacement of CS51411EDR8G?
All CS51411EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51411EDR8G, 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 CS51411EDR8G part is unused and in its original packaging.
Return procedure for CS51411EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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