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onsemi CS51411EDR8
- Part No.:
- CS51411EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51411EDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,405
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Product details
Overview
CS51411EDR8 from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, external BOOST pin for bootstrapped NPN switch drive, SYNC input for noise-sensitive or parallel operation, and thermal shutdown protection. It operates from 4.5 V to 40 V input and delivers tightly regulated output voltage in industrial power supplies and embedded DC-DC converters.
For engineers reviewing the CS51411EDR8 datasheet, pinout, applications, or equivalent options, key selection considerations include its 260 kHz switching frequency, SYNC capability (not BIAS), SOIC-8 package, 2.0% reference tolerance, and functional pin-compatibility with LT1375 for drop-in replacement in legacy designs.
Technical Context
The CS51411EDR8 implements V² control architecture, where both PWM comparator inputs derive from the output feedback signal - one path providing fast AC ripple-based ramp (FFB), the other delivering filtered DC error (SFB) via the VC pin. This decouples transient response from error amplifier bandwidth.
It integrates an on-chip NPN power switch rated for ≥1.5 A, driven via BOOST pin to ensure saturation and minimize VCE(sat); includes cycle-by-cycle current limiting, frequency foldback below 0.29 V on VFB, and active-low SHDNB with 85 µA shutdown quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz ±13% - enables compact magnetics and EMI filtering; stable across line/load/temperature. |
| Output Current | 1.5 A continuous - supported by integrated NPN switch with 0.7 V typical VCE(sat) at 1.5 A when BOOST is properly biased. |
| Input Voltage Range | 4.5 V to 40 V - suitable for 5 V, 12 V, 24 V, and 36 V industrial bus rails without external pre-regulation. |
| Reference Voltage | 1.270 V ±1.2% - 2.0% total tolerance enables precise output regulation using standard resistor dividers. |
| SYNC Input Range | 305–470 kHz TTL-compatible - allows synchronization to external clock for noise reduction or multi-phase interleaving. |
| Thermal Shutdown | 185 °C trip with 42 °C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments. |
| Shutdown Quiescent Current | 85 µA max - ensures ultra-low standby power in battery-backed or energy-sensitive systems. |
Pinout & Package
CS51411EDR8 is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST; pins 2–4 are VIN; pin 5 is SHDNB; pin 6 is GND; pin 7 is VFB; pin 8 is VC. No internal connections exist at pins marked NC in DFN variants - SOIC-8 has no NC pins.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; must be connected to capacitor-diode network referenced to VSW to maintain saturation and efficiency. |
| 2–4 (VIN) | Main power input | Supplies power to internal bias rails and collector of NPN switch; requires local 100 µF ceramic + bulk capacitance near pin. |
| 5 (SHDNB) | Active-low enable | Pulled high internally; drives <1.0 V to enter 85 µA sleep mode; compatible with 3.3 V/5 V logic without level shift. |
| 6 (GND) | Power return | Common return for switch emitter, error amp, and oscillator; must be low-inductance connection to minimize noise coupling. |
| 7 (VFB) | Feedback input | Inverting input of transconductance error amp; voltage below 0.29 V triggers frequency foldback and current limit reduction for short-circuit protection. |
| 8 (VC) | Error amplifier output | Provides access to compensation node; 0.1 µF to GND sets dominant pole; clamped to prevent latch-up during fault recovery. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Enables >10 kHz closed-loop bandwidth and sub-µs load transient response without complex compensation. |
| SYNC input (CS51411/CS51413 only) | Allows deterministic timing alignment across multiple regulators to suppress beat frequencies and simplify EMI filtering. |
| Frequency foldback under fault | Reduces switching frequency to 65 kHz when VFB < 0.29 V, cutting power dissipation by ~75% during short circuit. |
| Soft-start via VC pin | Uses internal error amp source current charging external 0.1 µF capacitor - eliminates need for dedicated soft-start pin or circuitry. |
| Pin-compatibility with LT1375 | Enables direct replacement in existing LT1375-based designs without PCB revision or layout changes. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V vehicle battery or 24 V industrial rail to 3.3 V or 5 V for microcontrollers and I/O drivers. IC Role / Device Role / Timing Role: Primary buck controller managing high-current, wide-input DC-DC conversion with robust fault handling. Use Value: 260 kHz switching enables small 10–22 µH inductors; SYNC capability avoids interference with CAN/LIN clock domains. |
Use Scenario: Regulating 12 V automotive battery to 5 V for sensor interfaces and communication ICs in harsh temperature environments. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with thermal shutdown and wide VIN range for under-hood applications. Use Value: −40 °C to +85 °C operating range and 40 V absolute max VIN withstand transient load dump events per ISO 7637-2. |
| Point-of-Load Converter for FPGA Core | Smart Sensor Node Power Management |
Use Scenario: Providing clean, tightly regulated 1.2 V or 1.8 V core supply for FPGAs in test equipment or edge computing gateways. IC Role / Device Role / Timing Role: High-transient-response buck regulator delivering up to 1.5 A with minimal output voltage deviation. Use Value: V² control achieves <50 mV output droop under 1 A step load; soft-start prevents inrush stress on input capacitors. |
Use Scenario: Powering ultra-low-power IoT sensors and wireless transceivers requiring reliable wake-up from deep sleep states. IC Role / Device Role / Timing Role: Enable-controlled buck regulator with 85 µA shutdown current and fast startup from 2.2 V VIN. Use Value: SHDNB pin allows host MCU to power-cycle CS51411EDR8 on demand, extending battery life in intermittent-sensing applications. |
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, same SOIC-8 footprint and pinout; 1.5 A rating, 250 kHz nominal frequency; no SYNC input. | Lacks synchronization capability; requires separate clock generator if noise coordination is needed. | Preferred for cost-sensitive, non-synchronized legacy upgrades where footprint reuse is critical. |
| MP2307DS-LF-Z | Monolithic 2 A buck converter in SOIC-8; 340 kHz switching; no BOOST/SYNC pins; uses MOSFET instead of NPN. | Higher current, lower RDS(on), but lacks V² control and external sync - slower transient response and less flexible fault management. | Selected when higher efficiency at light loads is prioritized over transient performance and synchronization flexibility. |
Compared with LT1375CS8#PBF, CS51411EDR8 adds SYNC functionality and tighter reference tolerance; compared with MP2307DS-LF-Z, it offers superior transient response and fault-aware frequency foldback, at the cost of slightly higher conduction loss due to bipolar switch architecture.
Availability
CS51411EDR8 is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body electronics, and FPGA point-of-load converters requiring stable component supply and long-term lifecycle support.
Supply support for CS51411EDR8 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 supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5141X product line was designed specifically for high-reliability, wide-input-voltage DC-DC conversion in space-constrained industrial and automotive systems, emphasizing robustness, ease of design, and fault resilience.
FAQ
What is the maximum input voltage rating for CS51411EDR8?
The CS51411EDR8 supports an absolute maximum input voltage of 40 V on the VIN pin. Operation above 40 V risks permanent damage. The device is rated for continuous operation from 4.5 V to 40 V, making it suitable for 24 V industrial buses and 12 V automotive systems with load dump tolerance. Always observe derating guidelines per ambient temperature and PCB copper area.
Does CS51411EDR8 require an external bootstrap capacitor?
Yes, CS51411EDR8 requires an external bootstrap capacitor connected between BOOST and VSW pins, typically a 0.1 µF X7R ceramic capacitor with low ESR. This capacitor provides the elevated voltage needed to fully saturate the internal NPN power switch, minimizing VCE(sat) and improving efficiency. Omitting it causes excessive switch dissipation and potential thermal shutdown.
Can CS51411EDR8 be synchronized to an external clock?
Yes, CS51411EDR8 supports external synchronization via its SYNC pin, accepting TTL-compatible signals from 305 kHz to 470 kHz. This feature enables noise reduction in sensitive analog circuits and coordinated switching in multi-rail systems. Note that frequency foldback is disabled during sync mode, so short-circuit protection relies solely on current limiting.
Is CS51411EDR8 pin-compatible with LT1375?
Yes, CS51411EDR8 is functionally pin-compatible with LT1375 in SOIC-8 packages, sharing identical pin assignments for BOOST, VIN, SHDNB, GND, VFB, and VC. This allows direct replacement in existing LT1375 designs without PCB modification, while adding SYNC capability and improved reference accuracy.
What protection features does CS51411EDR8 include?
CS51411EDR8 integrates thermal shutdown (trip at 185 °C), cycle-by-cycle current limiting (1.6–3.0 A threshold), frequency foldback (reduces switching frequency to 65 kHz when VFB < 0.29 V), soft-start (via VC pin), and under-voltage lockout (startup at 2.2–4.4 V). These features collectively protect the IC, inductor, and catch diode during overload, short circuit, and startup conditions.
CS51411EDR8 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
CS51411EDR8 FAQ
1.How can I place an order for CS51411EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411EDR8 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 CS51411EDR8 reliable?
The price and inventory of CS51411EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411EDR8 is usually 5 days.
3.What payment methods are accepted for CS51411EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411EDR8?
CS51411EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411EDR8 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 CS51411EDR8?
For technical support, including CS51411EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411EDR8 requirements.
6.How does Aetrix verify that CS51411EDR8 is sourced from the original manufacturer or authorized distributors?
All CS51411EDR8 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 CS51411EDR8 meets industry standards.
7.What is the process for return or replacement of CS51411EDR8?
All CS51411EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51411EDR8, 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 CS51411EDR8 part is unused and in its original packaging.
Return procedure for CS51411EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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