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onsemi CS51411ED8
- Part No.:
- CS51411ED8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51411ED8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
CS51411ED8 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, delivers regulated output via external inductor/diode, and targets industrial power supplies and automotive body electronics.
For engineers reviewing the CS51411ED8 datasheet, pinout, applications, or equivalent options, key selection criteria include its 260 kHz switching frequency, SYNC capability (not BIAS), SOIC-8 package compatibility with LT1375, VFB foldback threshold at 0.29–0.36 V, and 0.4–1.0 V saturation voltage under 1.5 A load.
Technical Context
The CS51411ED8 implements V² control architecture-using both DC output voltage and AC ripple as PWM inputs-to achieve ultrafast transient response independent of error amplifier bandwidth while simplifying loop compensation. Its internal NPN power switch is driven via BOOST pin to ensure saturation and minimize on-chip dissipation.
It features cycle-by-cycle current limiting (1.6–3.0 A typical), frequency foldback (reducing to 65 kHz during short circuit), soft-start via VC pin capacitor charging, and TTL-compatible active-low SHDNB with 85 µA shutdown current. The SYNC pin accepts 305–470 kHz external clock signals and disables foldback during sync mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and EMI filtering for space-constrained 12 V/24 V industrial converters. |
| Output Current | 1.5 A continuous; supported by integrated NPN transistor with BOOST-assisted saturation and 0.4–1.0 V VCE(sat). |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction and current limit foldback to protect IC and external components during overload. |
| SYNC Input Range | 305–470 kHz; allows precise timing coordination across multiple regulators or EMI spread-spectrum alignment. |
| Startup Voltage | 2.2–4.4 V; ensures reliable enablement after cold cranking or brown-out recovery in automotive systems. |
| Thermal Shutdown | 175–195 °C trip point with 42 °C hysteresis; prevents latch-up and enables safe auto-recovery after thermal stress. |
| Quiescent Current | 6.25 mA typical; balances low-noise regulation with standby power efficiency in always-on subsystems. |
Pinout & Package
CS51411ED8 is housed in an SOIC-8 (Case 751) package with 1.27 mm pitch, rated for −40 °C to +85 °C operation and RoHS-compliant Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive supply | Provides elevated base drive 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 IC bias and collector of internal NPN switch; accepts 4.5–40 V with −0.3 V absolute minimum rating. |
| 5,6,7 - VSW | Switch emitter node | Connects to inductor and catch diode; swings negative up to −1.0 V (t < 50 ns); requires short PCB traces for EMI control. |
| 8 - SHDNB | Active-low shutdown | TTL-compatible input; pulls below 1.0 V to enter sleep mode (≤85 µA IQ); internal pull-up eliminates need for external resistor. |
| - GND | Power return | Common reference for all internal circuits and external feedback; must be low-impedance connection to minimize noise coupling. |
| - VFB | Feedback input | Inverting input of error amplifier; regulates output by comparing against 1.244–1.296 V internal reference; triggers foldback at 0.29 V. |
| - VC | Error amplifier output | Provides PWM comparator input; clamped to limit overcurrent recovery time; requires 0.1 µF capacitor to ground for soft-start and compensation. |
| - SYNC | Synchronization input | Accepts external clock rising edge to force new switching cycle; disables foldback and enables multi-phase or noise-optimized operation. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers sub-µs transient response without high-bandwidth error amplifier; eliminates need for complex compensation networks. |
| BOOST pin bootstrapping | Reduces NPN saturation voltage by ~30%, cutting on-chip conduction loss and enabling >90% efficiency at 12 VIN/5 VOUT. |
| SYNC input with foldback disable | Allows deterministic timing alignment across multiple rails while preserving full current capability during synchronized operation. |
| Frequency and current foldback | Reduces switching frequency to 65 kHz and limits peak current to ~1.5 A during short circuit-cutting power dissipation by >70%. |
| Soft-start via VC pin | Uses internal error amplifier source current (15–35 µA) and external 0.1 µF capacitor to ramp output voltage over ≥5 ms-preventing inrush stress. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Regulating 24 V vehicle battery down to 5 V for microcontroller, CAN transceiver, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck controller providing stable 5 V rail with SYNC capability to align switching edges away from CAN FD communication windows. Use Value: V² control ensures <50 µs recovery from 1 A load steps; thermal shutdown protects against sustained overloads in enclosed junction boxes. |
Use Scenario: Converting 12 V automotive supply to 3.3 V for infotainment MCU and display logic in head units with strict EMI requirements. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator synchronized to system clock to avoid beat frequencies in audio band (20 Hz–20 kHz). Use Value: 260 kHz operation enables small 4.7 µH inductors; BOOST pin reduces heat rise in cramped dash-mounted enclosures. |
| Factory Automation I/O Module | Point-of-Load Converter for PLC CPU |
|
Use Scenario: Generating isolated 5 V supply for digital I/O drivers and optocouplers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-input-voltage buck stage accepting 18–36 V DC field bus, delivering 1.5 A with robust line regulation (0.05%/V). Use Value: Wide 4.5–40 V input range accommodates brown-outs and surges; SHDNB enables remote power cycling during firmware updates. |
Use Scenario: Local 3.3 V regulation for ARM-based PLC CPU core, requiring fast transient response to burst processing loads. IC Role / Device Role / Timing Role: V²-controlled buck converter with soft-start and foldback, placed adjacent to CPU to minimize trace inductance. Use Value: Sub-100 ns minimum pulse width supports high duty cycles at low VOUT; VC pin clamping enables rapid recovery from overcurrent events. |
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, 250 kHz, no SYNC or BOOST pin; uses voltage-mode control. | Lacks synchronization and bootstrapped drive-unsuitable for noise-critical or high-efficiency designs above 15 VIN. | Select when legacy design reuse is required and SYNC/BOOST features are unnecessary. |
| MP2307DN-LF-Z | SOIC-8, 2 A, 500 kHz, integrated MOSFET; no SYNC or BOOST; uses current-mode control; lower quiescent current (2.5 mA). | Higher frequency enables smaller inductors but increases EMI risk; lacks foldback protection and thermal hysteresis spec. | Prefer for cost-sensitive, low-power applications where 260 kHz timing alignment is not needed. |
Compared with LT1375CS8#PBF and MP2307DN-LF-Z, CS51411ED8 uniquely combines SYNC capability, BOOST-driven NPN efficiency, and V² transient performance in a drop-in SOIC-8 package-making it optimal for automotive and industrial systems demanding both robustness and timing control.
Availability
CS51411ED8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, factory automation I/O modules, and PLC point-of-load converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS51411ED8 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 leader focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications with emphasis on reliability and sustainability.
The CS5141X product line was designed specifically for high-transient, wide-input-voltage DC-DC conversion in harsh environments-emphasizing V² control simplicity, thermal resilience, and functional safety readiness.
FAQ
What is the maximum input voltage rating for the CS51411ED8?
The CS51411ED8 supports a maximum input voltage of 40 V on the VIN pins, with an absolute minimum rating of −0.3 V. This 4.5–40 V operating range makes CS51411ED8 suitable for 24 V industrial buses and 12 V automotive systems with load-dump tolerance. Exceeding 40 V risks permanent damage per the Absolute Maximum Ratings table.
Does the CS51411ED8 support external synchronization, and what is its valid frequency range?
Yes, the CS51411ED8 supports external synchronization via its SYNC pin, with a valid input frequency range of 305–470 kHz. The SYNC signal must be TTL-compatible, with a threshold voltage of 1.0–1.9 V and 10–90% duty cycle tolerance. During sync operation, the frequency foldback feature is disabled to maintain full switching capability.
How does the BOOST pin function in the CS51411ED8, and what external components are required?
The BOOST pin in CS51411ED8 provides elevated base drive to the internal NPN power switch using a bootstrap capacitor and diode (e.g., 0.1 µF ceramic + 1N4148). When the switch turns on, BOOST voltage equals VIN + VOUT − VF, reducing VCE(sat) and improving efficiency-especially critical at high input voltages. No BOOST connection results in higher conduction loss.
What protection features are integrated into the CS51411ED8?
The CS51411ED8 integrates thermal shutdown (175–195 °C trip), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz), and soft-start. It also includes under-voltage lockout (startup voltage 2.2–4.4 V) and negative voltage tolerance on VSW (−1.0 V, t < 50 ns). These features collectively safeguard the IC and external components during fault conditions without external circuitry.
Is the CS51411ED8 pin-compatible with any industry-standard alternatives?
Yes, the CS51411ED8 is functionally pin-compatible with the Linear Technology LT1375 in SOIC-8 package-matching pin assignments for BOOST, VIN, VSW, SHDNB, GND, VFB, VC, and SYNC. This enables direct replacement in existing LT1375 designs while adding SYNC and BOOST functionality without PCB changes.
CS51411ED8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
CS51411ED8 FAQ
1.How can I place an order for CS51411ED8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411ED8 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 CS51411ED8 reliable?
The price and inventory of CS51411ED8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411ED8 is usually 5 days.
3.What payment methods are accepted for CS51411ED8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411ED8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411ED8?
CS51411ED8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411ED8 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 CS51411ED8?
For technical support, including CS51411ED8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411ED8 requirements.
6.How does Aetrix verify that CS51411ED8 is sourced from the original manufacturer or authorized distributors?
All CS51411ED8 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 CS51411ED8 meets industry standards.
7.What is the process for return or replacement of CS51411ED8?
All CS51411ED8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51411ED8, 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 CS51411ED8 part is unused and in its original packaging.
Return procedure for CS51411ED8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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