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onsemi CS51412GD8G
- Part No.:
- CS51412GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412GD8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,270
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Product details
Overview
CS51412GD8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with external BIAS supply capability for improved light-load efficiency at high input voltages. It integrates an on-chip NPN power switch, V² control architecture for ultrafast transient response, and protection features including thermal shutdown, cycle-by-cycle current limiting, and frequency foldback. It operates from 4.5 V to 40 V input and delivers regulated output in industrial power supplies.
For engineers reviewing the CS51412GD8G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, SOIC-8 package mapping, functional alternatives with documented differences, and supply support for production ramp-up.
Technical Context
The CS51412GD8G implements V² control architecture-using the converter's output voltage ripple as both DC setpoint and AC control ramp-enabling transient response independent of error amplifier bandwidth and simplifying 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 variant supports external BIAS supply (3.3–6.0 V) on Pin 4 to power internal circuitry, reducing quiescent dissipation when VIN exceeds 12 V. It lacks SYNC functionality (unlike CS51411/CS51413), but includes BOOST pin drive for NPN saturation optimization and SHDNB for active-low shutdown with <85 µA sleep current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A continuous - supports single-rail industrial microcontroller or FPGA core supplies without external pass devices. |
| Switching Frequency | 260 kHz ±13% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. >1 MHz parts. |
| Input Voltage Range | 4.5 V to 40 V - accommodates 12 V/24 V/36 V industrial bus rails and automotive cold-crank transients down to 4.5 V. |
| V² Control Architecture | Provides sub-10 µs load-step response - eliminates need for complex Type III compensation networks in point-of-load designs. |
| BIAS Supply Input | 3.3 V to 6.0 V on Pin 4 - reduces IC power loss by ~40% at 24 V input / 100 mA load vs. VIN-biased operation. |
| Saturation Voltage | 0.7 V max at 1.5 A - minimizes conduction loss in integrated NPN switch; requires external catch diode (e.g., 1N5821). |
| Thermal Shutdown | 185 °C trip point with 42 °C hysteresis - protects against sustained overload or poor PCB heatsinking in enclosed enclosures. |
Pinout & Package
CS51412GD8G is housed in an SOIC-8 (Case 751, D suffix) package with standard 1.27 mm pitch, 5.0 mm × 6.2 mm body, and exposed pad not connected internally. Thermal resistance θJA = 120 °C/W (JEDEC 2-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | NPN base drive boost node | Connects to bootstrap capacitor (0.1 µF) + diode (1N4148) to raise base voltage above VIN, ensuring NPN saturation and minimizing VCE(sat). |
| 2,3,4 - VIN | Main power input | Supplies collector of internal NPN switch and bias for oscillator/control logic; must be decoupled with ≥100 µF bulk + 0.1 µF ceramic near pin. |
| 5,6,7 - VSW | Switch emitter output | Drives inductor; swings negative to −1.0 V (50 ns); requires Schottky catch diode (e.g., 1N5821) from VSW to GND or output rail. |
| 8 - BIAS | External bias rail input | Accepts 3.3–6.0 V to power internal LDO and control circuitry - improves efficiency at high VIN/light load; left floating if unused. |
| - SHDNB (Pin 8 in CS51411/3; not present on CS51412GD8G) | Not applicable | CS51412GD8G uses dedicated BIAS pin (Pin 8); SHDNB is on Pin 5 in CS51411/CS51413 variants - no shutdown function on this part. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Enables stable regulation with only 0.1 µF VC-to-GND compensation capacitor - eliminates need for RC/Zener networks or multi-pole filters. |
| Frequency foldback under fault | Reduces switching frequency to 65 kHz (25% of nominal) when VFB < 0.29 V - cuts short-circuit power dissipation by >60% vs. fixed-frequency operation. |
| BOOST-driven NPN switch | Guarantees <0.7 V saturation at 1.5 A - allows use of low-cost discrete catch diodes instead of synchronous MOSFETs in cost-sensitive designs. |
| Soft-start via VC pin | Internal error amplifier source current (25 µA typ.) ramps VC voltage through external capacitor - achieves ~5 ms startup without dedicated SS pin or external circuitry. |
| Thermal shutdown with hysteresis | 185 °C trip + 42 °C hysteresis prevents thermal cycling during overload - maintains safe junction temperature without external thermal monitoring. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Regulating 24 V vehicle battery to 5 V for microcontroller, CAN transceiver, and sensor interface circuits in door modules or seat controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable 5 V rail; BIAS pin powered from local 5 V LDO to maximize efficiency during stop-start engine cycles. Use Value: Achieves >88% efficiency at 24 VIN/5 VOUT/100 mA, reducing thermal stress in sealed plastic housings where airflow is limited. |
Use Scenario: Generating 3.3 V for ARM Cortex-M based programmable logic controller (PLC) I/O cards operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Fixed-frequency buck controller with V² loop stability across wide temperature range (−40 °C to 85 °C) and varying load steps from digital I/O switching. Use Value: Delivers <10 µs transient recovery from 0–1 A load step - prevents brownout resets during simultaneous solenoid activation and communication bursts. |
| Medical Patient Monitor Auxiliary Rail | Factory Automation Sensor Hub |
|
Use Scenario: Powering isolated ADC front-ends and analog signal conditioning stages in portable patient monitors requiring low-noise, low-EMI 3.3 V supply. IC Role / Device Role / Timing Role: Low-ripple buck regulator using MLCC output filter and dcr-based ramp sensing - avoids tantalum capacitors and meets IEC 60601 EMI limits. Use Value: V² architecture suppresses switching noise coupling into sensitive analog paths; 260 kHz frequency avoids critical bands in EEG/ECG signal chains. |
Use Scenario: Providing 12 V intermediate rail for multiple RS-485 transceivers, optocouplers, and status LEDs in distributed I/O sensor hubs. IC Role / Device Role / Timing Role: High-input-voltage buck stage stepping 36 V PoE++ or 24 V DIN rail down to 12 V with robust overvoltage/overcurrent protection. Use Value: Built-in cycle-by-cycle current limit (2.3 A typ.) and thermal shutdown prevent latch-up during cable short events in harsh factory environments. |
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 SOIC-8 footprint and BIAS functionality; 1.75 A rated, 500 kHz default frequency (vs. 260 kHz), higher quiescent current (6 mA vs. 6.25 mA). | Higher frequency enables smaller magnetics but increases EMI filtering burden; less suitable for noise-sensitive analog rails. | Select LT1376CS8#PBF only when faster transient response or smaller inductors are prioritized over EMI and light-load efficiency. |
| MP2451DT-LF-Z | 3 A rated, 2 MHz switching, no BIAS pin; requires external bootstrap capacitor and synchronous MOSFETs; RoHS-compliant but not Pb-free per J-STD-609. | Designed for compact, high-density layouts; lacks V² control - needs full Type II/III compensation and suffers slower transient response than CS51412GD8G. | Choose MP2451DT-LF-Z for space-constrained consumer-grade designs where 2 MHz operation justifies added layout complexity and reduced fault tolerance. |
Compared with LT1376CS8#PBF and MP2451DT-LF-Z, CS51412GD8G offers superior light-load efficiency via BIAS operation, simpler compensation due to V² architecture, and proven ruggedness in industrial ambient conditions - making it optimal for reliability-critical 24–36 V input systems where EMI and thermal margin are primary constraints.
Availability
CS51412GD8G is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical auxiliary rails, and factory automation sensor hubs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CS51412GD8G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5141X family was designed specifically for high-reliability, wide-input-voltage buck conversion in industrial and transportation systems - emphasizing thermal robustness, fault resilience, and simplified design with V² control.
FAQ
What is the maximum input voltage rating for CS51412GD8G?
The CS51412GD8G has an absolute maximum VIN rating of 40 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V risks permanent damage to the internal NPN switch and control circuitry. For 48 V automotive or industrial applications, a pre-regulator stage is required before CS51412GD8G.
Does CS51412GD8G support synchronization to an external clock?
No, CS51412GD8G does not support external synchronization. The SYNC pin is absent in this variant - only CS51411 and CS51413 include SYNC functionality. Attempting to drive a clock signal into any pin other than BOOST, BIAS, or SHDNB (which CS51412GD8G lacks) will damage the device.
How is soft-start implemented on CS51412GD8G without a dedicated SS pin?
CS51412GD8G implements soft-start intrinsically via its VC pin: the error amplifier's 25 µA typical output source current charges an external capacitor (e.g., 0.1 µF) from the VC pin to GND, gradually raising the control voltage and limiting inrush current. This eliminates need for external timers or resistors.
Can CS51412GD8G operate without connecting the BOOST pin?
No - the BOOST pin must be connected to a bootstrap network (0.1 µF capacitor + 1N4148 diode) referenced to VSW. Leaving BOOST unconnected causes the internal NPN switch to operate in linear mode, increasing VCE(sat) beyond 1.0 V and risking thermal runaway at >500 mA loads.
What is the purpose of the BIAS pin on CS51412GD8G, and what happens if it's left unconnected?
The BIAS pin on CS51412GD8G accepts 3.3–6.0 V to power internal control circuitry, reducing quiescent loss when VIN > 12 V. If left unconnected, the IC defaults to VIN biasing - functional but less efficient, especially at 24 V input and light loads. No damage occurs, but efficiency drops up to 15% at 24 V/100 mA.
CS51412GD8G 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
CS51412GD8G FAQ
1.How can I place an order for CS51412GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412GD8G 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 CS51412GD8G reliable?
The price and inventory of CS51412GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412GD8G is usually 5 days.
3.What payment methods are accepted for CS51412GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412GD8G?
CS51412GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412GD8G 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 CS51412GD8G?
For technical support, including CS51412GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412GD8G requirements.
6.How does Aetrix verify that CS51412GD8G is sourced from the original manufacturer or authorized distributors?
All CS51412GD8G 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 CS51412GD8G meets industry standards.
7.What is the process for return or replacement of CS51412GD8G?
All CS51412GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51412GD8G, 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 CS51412GD8G part is unused and in its original packaging.
Return procedure for CS51412GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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