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onsemi CS51411ED8G
- Part No.:
- CS51411ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51411ED8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,464
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Product details
Overview
CS51411ED8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, external BOOST capacitor support, and synchronization capability. It operates from 4.5 V to 40 V input, delivers ultrafast transient response, and integrates an on-chip NPN power switch for step-down DC-DC conversion in industrial power supplies and automotive body electronics.
For engineers reviewing the CS51411ED8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 260 kHz switching frequency, SYNC pin compatibility with external clocks up to 470 kHz, 0.29 V VFB foldback threshold, thermal shutdown at 185 °C, and SOIC-8 package with BOOST/VIN/VSW/SHDNB/GND/VFB/VC/SYNC pin configuration.
Technical Context
The CS51411ED8G implements V² control architecture-using both DC output voltage and AC ripple as PWM inputs-to decouple transient response from error amplifier bandwidth. Its internal NPN switch features cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz under short circuit), and BOOST-driven saturation voltage ≤ 0.7 V at 1.5 A.
It supports synchronization via TTL-compatible SYNC pin (1.0–1.9 V threshold, 305–470 kHz range), includes soft-start via VC pin compensation, and provides shutdown functionality with <85 µA quiescent current. The device is rated for −40 °C to 85 °C operation and RoHS-compliant Pb-free SOIC-8 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and EMI filtering for space-constrained designs |
| Output Current | 1.5 A continuous; supported by integrated NPN transistor with BOOST-assisted saturation |
| Input Voltage Range | 4.5 V to 40 V; suitable for 12 V/24 V automotive and industrial bus systems |
| VFB Foldback Threshold | 0.29 V typical; triggers frequency reduction and current limit foldback during overload |
| Thermal Shutdown | 185 °C trip point with 42 °C hysteresis; prevents latch-up and ensures safe recovery |
| Shutdown Quiescent Current | 20 µA typical; reduces system standby power in battery-backed applications |
| SYNC Input Range | 305–470 kHz; allows noise-sensitive multi-rail systems to synchronize switching |
Pinout & Package
CS51411ED8G is housed in an 8-pin SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST; pins 2–4 are VIN; pin 5 is VSW; pin 6 is SHDNB; pin 7 is GND; pin 8 is VFB; VC and SYNC share no dedicated pins in this variant-VC is accessible only via pin 8 (VFB) feedback network connection per design, and SYNC is not assigned in CS51411ED8G per product selection guide.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive supply | Provides elevated base drive to NPN switch; reduces saturation voltage and improves efficiency |
| 2–4 - VIN | Main power input | Supplies IC bias and switch collector; accepts 4.5–40 V with 40 V absolute max rating |
| 5 - VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns); requires catch diode clamping |
| 6 - SHDNB | Active-low shutdown control | TTL-compatible input; pulls below 1.0 V to enter sleep mode (<85 µA IQ) |
| 7 - GND | Power return reference | Common return for internal circuits, switch emitter, and feedback network |
| 8 - VFB | Error amplifier inverting input | Senses output voltage divider; triggers foldback at 0.29 V and enables VC-based compensation |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers load transient response independent of error amplifier bandwidth; eliminates need for high-gain compensation |
| BOOST pin operation | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting on-die power loss by >30% vs non-boosted operation |
| Frequency foldback | Reduces switching frequency to 65 kHz during short circuit, lowering dissipation in IC and external components |
| Soft-start via VC pin | Uses internal error amplifier source current to ramp VC voltage; achieves controlled startup without extra components |
| Thermal shutdown with hysteresis | Trips at 185 °C and resets at 143 °C; prevents thermal cycling and ensures reliable fault recovery |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Regulating 12 V battery input to 3.3 V for microcontroller and CAN transceiver rails in door modules. IC Role / Device Role / Timing Role: Primary buck controller providing regulated 3.3 V @ 1.0 A with SYNC pin tied to main system clock to reduce conducted EMI. Use Value: V² control ensures <50 µs recovery from 1 A load steps; BOOST pin maintains efficiency >88% across 9–16 V input range. | Use Scenario: Generating isolated 5 V rail from 24 V DC bus for analog sensor signal conditioning in factory automation terminals. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with SHDNB controlled by PLC logic to disable auxiliary power during maintenance mode. Use Value: Thermal shutdown protects against ambient temperature excursions up to 85 °C; 260 kHz frequency simplifies filter design for EN 61000-4-3 compliance. |
| Telecom Remote Radio Unit | Medical Point-of-Care Monitor |
Use Scenario: Converting 48 V backplane supply to 5 V for FPGA configuration and interface logic in outdoor small cells. IC Role / Device Role / Timing Role: High-input-voltage buck regulator using BOOST capacitor to sustain low dropout under 40 V transients. Use Value: 40 V absolute max VIN rating withstands telecom surge standards; foldback protection limits fault energy during lightning-induced surges. | Use Scenario: Powering display backlight and touch controller from 12 V battery in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise buck converter with SYNC disabled and soft-start enabled to prevent inrush into capacitive LCD loads. Use Value: 20 µA shutdown current extends battery life; VFB foldback avoids overcurrent damage during display cold-start conditions. |
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, 500 kHz; higher frequency but no V² control or BOOST pin | Lacks frequency foldback and thermal hysteresis; requires external soft-start | Choose when board area is critical and input voltage ≤20 V; verify loop stability without V² architecture |
| MP2307DN-LF-Z | 1.2 A, 340 kHz; MOSFET-based, no BOOST, different pinout (no SYNC) | No synchronization capability; lower current rating and no foldback protection | Select for cost-sensitive consumer applications where 1.2 A output suffices and EMI synchronization is unnecessary |
Compared with LT1375CS8#PBF and MP2307DN-LF-Z, CS51411ED8G offers superior transient response via V² control, integrated foldback protection, and BOOST-enhanced efficiency at high input voltages-making it preferred for automotive and industrial environments demanding robustness and fast load regulation.
Availability
CS51411ED8G is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, telecom remote radio units, and medical point-of-care monitors requiring stable component supply and long-term lifecycle support.
Supply support for CS51411ED8G 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 buck conversion in harsh environments-emphasizing thermal resilience, EMI control via synchronization, and simplified compensation through V² architecture.
FAQ
What is the maximum input voltage rating for CS51411ED8G?
The CS51411ED8G has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation above 40 V risks permanent damage. The recommended operating range is 4.5 V to 40 V, with optimal efficiency observed between 9 V and 24 V. This rating enables direct use in 24 V industrial systems and 12 V automotive applications with transient tolerance.
Does CS51411ED8G support external synchronization?
Yes, CS51411ED8G supports external synchronization via its SYNC pin, which accepts TTL-compatible input signals from 305 kHz to 470 kHz. The rising edge of the sync pulse initiates each switching cycle with ~0.5 µs delay. Synchronization is active only when the SYNC pin voltage exceeds 1.0 V and is disabled during frequency foldback conditions.
How does the BOOST pin improve efficiency in CS51411ED8G?
The BOOST pin in CS51411ED8G supplies elevated base drive to the internal NPN switch, reducing saturation voltage to ≤0.7 V at 1.5 A. This lowers on-die conduction loss by up to 35% compared to non-boosted operation-especially beneficial at high input voltages (e.g., 36 V) and light loads where efficiency gains exceed 5 percentage points.
What protection features are integrated into CS51411ED8G?
CS51411ED8G integrates thermal shutdown (185 °C trip, 42 °C hysteresis), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz under overload), and soft-start via VC pin. It also includes under-voltage lockout (startup at 2.2–4.4 V) and negative voltage tolerance (−1.0 V on VSW for <50 ns), ensuring robust operation in noisy or fault-prone environments.
Is CS51411ED8G pin-compatible with any legacy regulators?
Yes, CS51411ED8G is functionally pin-compatible with the LT1375, sharing identical SOIC-8 pin assignments for BOOST, VIN, VSW, SHDNB, GND, VFB, and VC. However, the SYNC pin on CS51411ED8G replaces the BIAS pin found on LT1375, requiring minor PCB layout adjustment if migrating from LT1375 designs that used BIAS functionality.
CS51411ED8G 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
CS51411ED8G FAQ
1.How can I place an order for CS51411ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411ED8G 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 CS51411ED8G reliable?
The price and inventory of CS51411ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411ED8G is usually 5 days.
3.What payment methods are accepted for CS51411ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411ED8G?
CS51411ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411ED8G 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 CS51411ED8G?
For technical support, including CS51411ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411ED8G requirements.
6.How does Aetrix verify that CS51411ED8G is sourced from the original manufacturer or authorized distributors?
All CS51411ED8G 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 CS51411ED8G meets industry standards.
7.What is the process for return or replacement of CS51411ED8G?
All CS51411ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51411ED8G, 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 CS51411ED8G part is unused and in its original packaging.
Return procedure for CS51411ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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