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onsemi CS51412EDR8
- Part No.:
- CS51412EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412EDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,251
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Product details
Overview
CS51412EDR8 from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with external bias capability, designed for high-efficiency DC-DC conversion in industrial and automotive power supplies. It integrates an on-chip NPN power switch, V² control architecture for ultrafast transient response, thermal shutdown, cycle-by-cycle current limiting, and frequency foldback. It operates from 4.5 V to 40 V input and delivers regulated output using external inductor and diode.
For engineers reviewing the CS51412EDR8 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed design parameters including 260 kHz switching frequency, 1.5 A output capability, BOOST and BIAS pin functionality, and real-world application constraints for stable low-voltage rail generation.
Technical Context
The CS51412EDR8 implements V² control architecture-using the converter's output voltage ripple as both DC reference and AC control ramp-enabling independent transient response from error amplifier bandwidth and simplified loop compensation. Its internal transconductance error amplifier (6.4 mA/V) drives the VC pin with 500 kHz unity-gain bandwidth and 70 dB open-loop gain.
This device uses an on-chip NPN switch biased via BOOST pin for saturation voltage minimization (0.4–1.0 V at 1.5 A), and supports external bias via BIAS pin (3.3–6.0 V) to reduce quiescent dissipation under high VIN/light-load conditions. Frequency foldback activates below 0.29 V on VFB, reducing switching frequency to 65 kHz and current limit to ~1.5 A during overload.
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 0.4–1.0 V saturation voltage at full load. |
| Input Voltage Range | 4.5 V to 40 V; accommodates wide industrial and automotive battery-fed systems. |
| V² Control Architecture | Delivers ultrafast load transient response without requiring high-bandwidth error amplifier compensation. |
| BIAS Pin Support | Accepts 3.3–6.0 V external supply to power internal circuitry-reducing IC dissipation by up to 40% at high VIN/light load. |
| Frequency Foldback Threshold | 0.29 V on VFB pin; triggers 4:1 frequency reduction and current foldback for short-circuit protection. |
| Shutdown Quiescent Current | 20 µA typical; enables ultra-low-power sleep mode when SHDNB is pulled low. |
Pinout & Package
CS51412EDR8 is housed in an SOIC-8 (D suffix, Case 751) package with 1.27 mm pitch and exposed pad for thermal enhancement. Pin 1 is BOOST; pin 2 is VIN; pin 3 is VSW; pin 4 is BIAS; pin 5 is SHDNB; pin 6 is GND; pin 7 is VFB; pin 8 is VC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap drive voltage source | Provides elevated base drive to NPN switch to minimize saturation voltage and improve efficiency; requires external 0.1 µF capacitor and diode. |
| VIN (Pin 2) | Main power input | Supplies collector of internal NPN switch and powers predriver circuits; rated 40 V max, −0.3 V min. |
| VSW (Pin 3) | Switch emitter node | Connects to inductor and catch diode; swings to −1.0 V (50 ns max) during flyback; requires short PCB traces for EMI control. |
| BIAS (Pin 4) | External bias rail input | Enables internal logic and error amplifier to run from 3.3–6.0 V supply-reducing VIN-related dissipation in high-input/low-load scenarios. |
| SHDNB (Pin 5) | Active-low shutdown control | TTL-compatible input; pulls IC into sleep mode (<85 µA) when <1.0 V; internal pull-up allows floating for default enable. |
| GND (Pin 6) | Power return reference | Common return for internal regulators, comparators, and PWM driver; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 7) | Error amplifier inverting input | Senses output voltage divider; triggers frequency foldback and current limit reduction when <0.29 V. |
| VC (Pin 8) | Error amplifier output / PWM comparator input | Exposes transconductance amplifier output; used for compensation (0.1 µF to GND typical); avoid injecting >0.5 mA. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Eliminates need for complex compensation networks-stable operation with ceramic output capacitors and DCR-based ramp sensing. |
| BOOST pin bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss by ≥30% vs. non-bootstrapped operation. |
| BIAS pin efficiency optimization | Lowers total IC dissipation by routing bias current from 3.3–6.0 V rail instead of VIN-critical for 24 V+ input, light-load applications. |
| Frequency foldback protection | Reduces switching frequency to 65 kHz and limits peak current to ~1.5 A during overloads-cutting short-circuit power dissipation by >60%. |
| Soft-start via VC pin | Uses internal error amplifier source current (25 µA typ.) charging external 0.1 µF capacitor to achieve ~5 ms controlled output ramp-prevents inrush stress. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Generating stable 3.3 V or 5.0 V rails from 12 V or 24 V vehicle battery with load transients up to 1 A. IC Role / Device Role / Timing Role: Primary buck controller managing inductor current, feedback regulation, and fault protection in standalone DC-DC stage. Use Value: V² control ensures sub-10 µs recovery from 50% load steps; BIAS pin maintains >88% efficiency at 24 VIN/100 mAOUT. |
Use Scenario: Powering microcontrollers, CAN transceivers, and sensors in body electronics where input voltage varies from 6 V (cold crank) to 40 V (load dump). IC Role / Device Role / Timing Role: Regulator IC providing robust, thermally protected 5 V rail with built-in short-circuit foldback and thermal shutdown. Use Value: 175–195 °C thermal trip point and 42 °C hysteresis prevent latch-up during sustained overloads; SOIC-8 package supports standard reflow. |
| Point-of-Load Converter for FPGA I/O Banks | Smart Meter Auxiliary Power Supply |
Use Scenario: Delivering 1.8 V or 2.5 V at up to 1.2 A to FPGA I/O banks with tight regulation and fast transient response. IC Role / Device Role / Timing Role: Fixed-frequency buck controller implementing V² loop for minimal output capacitance and no external slope compensation. Use Value: 2.0% reference tolerance and 0.05%/V line regulation ensure ±1.5% output accuracy across 4.5–40 V input range. |
Use Scenario: Converting 120 VAC-derived 15 V DC bus to isolated 3.3 V for meter MCU and RF module, operating continuously for >10 years. IC Role / Device Role / Timing Role: High-reliability buck regulator with 125 °C max junction rating and Pb-free RoHS-compliant SOIC-8 packaging. Use Value: 85 µA shutdown current extends backup battery life; thermal shutdown and cycle-by-cycle current limiting meet IEC 62053-21 reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376CS8#PBF | Pin-compatible, same 260 kHz frequency and 1.5 A rating, but uses current-mode control and lacks BIAS pin. | No external bias option-higher quiescent loss at high VIN; requires slope compensation for stability with ceramic caps. | Select LT1376CS8#PBF only if legacy design reuse or current-mode preference outweighs efficiency gains from BIAS support. |
| MP2307DS-LF-Z | Higher 340 kHz frequency, MOSFET-based, no BIAS pin, lower 0.35 Ω RDS(on), but lacks frequency foldback and V² architecture. | Better light-load efficiency due to MOSFET, but slower transient response and no short-circuit foldback-requires external protection. | Choose MP2307DS-LF-Z for cost-sensitive, low-noise, high-frequency apps where short-circuit robustness is handled externally. |
Compared with LT1376CS8#PBF and MP2307DS-LF-Z, the CS51412EDR8 uniquely combines V² control for fastest transient response, BIAS pin for high-VIN efficiency, and integrated frequency foldback-making it optimal for automotive and industrial applications demanding reliability under overload and wide input variation.
Availability
CS51412EDR8 is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, FPGA point-of-load converters, and smart meter auxiliary power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS51412EDR8 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-with emphasis on power management, analog, and sensor technologies.
The CS51412EDR8 belongs to onsemi's CS5141X family of V²-controlled buck regulators, engineered specifically for high-transient-response, high-efficiency DC-DC conversion in harsh environments where input voltage variation, thermal stress, and reliability are critical.
FAQ
What is the maximum input voltage rating for the CS51412EDR8?
The CS51412EDR8 has a maximum VIN rating of 40 V, with absolute maximum ratings specifying −0.3 V minimum and 40 V maximum on the VIN pin. Operation beyond these limits risks permanent damage. The device is designed for industrial and automotive inputs ranging from 4.5 V to 40 V, including load-dump transients up to 40 V.
Does the CS51412EDR8 support synchronization to an external clock?
No, the CS51412EDR8 does not support external synchronization. Only CS51411 and CS51413 variants include the SYNC pin; CS51412EDR8 features the BIAS pin instead. Attempting to drive a clock signal into any pin other than SHDNB, BIAS, or GND may damage the IC. Synchronization capability is exclusive to the CS51411/CS51413 family members.
How does the BIAS pin improve efficiency in the CS51412EDR8?
The BIAS pin on the CS51412EDR8 allows internal circuitry-including the error amplifier, comparators, and oscillator-to be powered from a 3.3–6.0 V external supply instead of VIN. This reduces power dissipation significantly at high input voltages (e.g., 24 V or 36 V) and light loads, where VIN-based bias would waste >40% more power as heat. Measured data shows up to 3.5% absolute efficiency gain at 24 VIN/100 mAOUT.
What protection features are integrated into the CS51412EDR8?
The CS51412EDR8 integrates thermal shutdown (trip at 175–195 °C with 42 °C hysteresis), 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 shutdown mode (<85 µA). These operate autonomously without external components, ensuring robust protection during overload, short circuit, or thermal stress.
Can the CS51412EDR8 be used with ceramic output capacitors?
Yes, the CS51412EDR8 supports ceramic output capacitors when paired with appropriate ramp generation-either via DCR sensing across the output inductor or voltage feed-forward techniques. Unlike traditional current-mode controllers, its V² architecture eliminates the need for slope compensation, enabling stable regulation with low-ESR MLCCs. Application Note AND8276/D confirms stable operation using two 10 µF 16 V X5R MLCCs.
CS51412EDR8 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
CS51412EDR8 FAQ
1.How can I place an order for CS51412EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412EDR8 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 CS51412EDR8 reliable?
The price and inventory of CS51412EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412EDR8 is usually 5 days.
3.What payment methods are accepted for CS51412EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412EDR8?
CS51412EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412EDR8 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 CS51412EDR8?
For technical support, including CS51412EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412EDR8 requirements.
6.How does Aetrix verify that CS51412EDR8 is sourced from the original manufacturer or authorized distributors?
All CS51412EDR8 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 CS51412EDR8 meets industry standards.
7.What is the process for return or replacement of CS51412EDR8?
All CS51412EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51412EDR8, 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 CS51412EDR8 part is unused and in its original packaging.
Return procedure for CS51412EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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