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onsemi CS51412GDR8
- Part No.:
- CS51412GDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412GDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,267
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Product details
Overview
CS51412GDR8 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 embedded 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 soft-start. It operates from 4.5 V to 40 V input and delivers regulated output using external inductor/diode.
For engineers reviewing the CS51412GDR8 datasheet, pinout, applications, or equivalent options, key selection considerations include its BIAS pin support for efficiency optimization at high VIN/low load, 260 kHz switching frequency, SOIC-8 package compatibility, and functional equivalence to LT1376 in bias-enabled configurations.
Technical Context
The CS51412GDR8 implements V² control architecture, where both inputs to the PWM comparator derive from the output voltage-fast feedback (AC + DC) and slow feedback (error amplifier output VC)-enabling transient response independent of error amplifier bandwidth. Its transconductance error amplifier features 1.270 V reference, 6.4 mA/V gm, and 500 kHz unity-gain bandwidth.
It uses an internal NPN switch with saturation voltage ≤0.7 V at 1.5 A, driven via BOOST pin for reduced conduction loss. Protection includes frequency foldback (to 65 kHz) and current limit foldback (to ~1.5 A) when VFB < 0.29 V, plus thermal shutdown at 185 °C with 42 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and EMI filtering for mid-power applications |
| Output Current | 1.5 A continuous; supports industrial sensors, PLC I/O, and FPGA core rails |
| Input Voltage Range | 4.5 V to 40 V; suitable for 12 V/24 V industrial bus and automotive battery-supplied systems |
| BIAS Pin Support | 3.3 V–6.0 V external bias; reduces quiescent dissipation and improves light-load efficiency |
| V² Control Architecture | Provides fast load-step response without complex compensation; simplifies loop design with single-pole VC capacitor |
| Thermal Shutdown | Trips at 185 °C with 42 °C hysteresis; prevents latch-up and ensures safe recovery after overload |
| Shutdown Quiescent Current | 20 µA typical; enables low-power standby modes in battery-backed or energy-sensitive systems |
Pinout & Package
CS51412GDR8 is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST; Pin 2 is VIN; Pin 3 is VSW; Pin 4 is BIAS; Pin 5 is GND; Pin 6 is VFB; Pin 7 is VC; Pin 8 is SHDNB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; reduces saturation voltage and improves efficiency |
| VIN | Main power input | Supplies collector of internal NPN switch; accepts 4.5–40 V; requires local 100 µF decoupling |
| VSW | Switch emitter node | Connects to inductor; swings negative during off-time; requires catch diode and short PCB routing |
| BIAS | External bias rail input | Enables internal circuitry to run from 3.3–6.0 V supply; lowers IC power loss vs. VIN-derived bias |
| GND | Power return | Common reference for all analog and power sections; must be low-impedance connection to minimize noise |
| VFB | Error amplifier inverting input | Senses output via resistor divider; triggers foldback protection below 0.29 V |
| VC | Error amplifier output | Drives PWM comparator; compensation capacitor (0.1 µF typical) sets dominant pole for stability |
| SHDNB | Active-low shutdown | TTL-compatible input; pulls low to reduce ICC to 20 µA; internal pull-up enables default-on operation |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers sub-10 µs load transient response without requiring high-bandwidth error amplifier or multi-pole compensation |
| External BIAS pin | Reduces IC power dissipation by up to 60% at VIN = 36 V / IOUT = 100 mA vs. VIN-biased operation |
| Frequency & current foldback | Reduces switching frequency to 65 kHz and peak current to ~1.5 A under short-circuit, limiting junction temperature rise |
| Soft-start via VC pin | Uses error amplifier source current to charge compensation capacitor; achieves ~5 ms ramp without dedicated SS pin |
| Thermal shutdown with hysteresis | Prevents thermal cycling; 42 °C hysteresis ensures stable recovery before re-enabling regulation |
Applications
| Industrial Sensor Power Supply | PLC Digital I/O Module |
|---|---|
Use Scenario: Powers 3.3 V or 5 V analog sensor front-ends in harsh factory environments with 24 V DC bus input. IC Role / Device Role / Timing Role: Primary buck controller regulating stable low-voltage rail; handles 100 ms load transients from sensor sampling bursts. Use Value: V² control ensures <50 mV output deviation during 1 A step loads; BIAS pin maintains >85% efficiency at 24 VIN/100 mAOUT. | Use Scenario: Supplies isolated digital I/O channel logic (e.g., 3.3 V FPGA I/O banks) in programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator with shutdown control for channel-level power gating. Use Value: SHDNB enables per-channel power-down; thermal shutdown protects against sustained overcurrent during field-wiring faults. |
| Automotive Body Control Module | Embedded Networking Gateway |
Use Scenario: Generates 5 V rail for CAN transceivers and microcontroller peripherals in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Input-filtered buck stage accepting wide-range automotive battery input (9–16 V), including cold-crank dips. Use Value: 4.5 V startup voltage ensures operation during cranking; 40 V max VIN withstands load-dump transients. | Use Scenario: Powers Ethernet PHY and MCU subsystems in industrial gateways with 24 V backplane input. IC Role / Device Role / Timing Role: High-reliability DC-DC stage supporting continuous operation across extended temperature range (0 °C to 70 °C). Use Value: SOIC-8 package allows standard reflow assembly; RoHS-compliant Pb-free finish meets IPC-J-STD-020 moisture sensitivity level 3. |
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 BIAS functionality, but uses current-mode control and lacks V² architecture | Requires more complex compensation; slower transient response (~200 µs vs. <10 µs) | Choose if legacy LT1376 footprint reuse is required and V² performance is not critical |
| MP2315GJ-Z | Monolithic 2 A synchronous buck; no BIAS pin; 500 kHz fixed frequency; different pinout and control scheme | Higher integration (integrated HS/LS FETs); no external diode needed; smaller solution size but less flexible biasing | Choose for space-constrained designs where 2 A output and synchronous efficiency outweigh need for BIAS optimization |
Compared with LT1376CS8#PBF, CS51412GDR8 delivers superior transient response and simplified compensation; compared with MP2315GJ-Z, it offers BIAS-driven efficiency gains at high VIN/low load but requires external diode and larger board area.
Availability
CS51412GDR8 is available at Aetrix Electronics and suitable for industrial sensor power supplies, PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51412GDR8 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5141X product line was engineered specifically for high-transient, wide-input industrial DC-DC conversion, emphasizing robustness, simplicity of design, and efficiency across varying load conditions.
FAQ
What is the maximum input voltage rating for CS51412GDR8?
The CS51412GDR8 has an absolute maximum VIN rating of 40 V. Operation above this voltage 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 automotive applications with load-dump immunity requirements. Always observe derating guidelines per ambient temperature and PCB thermal design.
Does CS51412GDR8 support synchronization to an external clock?
No, CS51412GDR8 does not support external synchronization. It belongs to the "Bias" variant group (CS51412/CS51414) and lacks the SYNC pin. Only CS51411 and CS51413 variants include synchronization capability. Attempting to drive a SYNC signal into CS51412GDR8's unused pin 5 (NC) may cause malfunction or damage.
How does the BIAS pin improve efficiency in CS51412GDR8?
The BIAS pin allows CS51412GDR8 to power its internal control circuitry from a low-voltage source (3.3–6.0 V), reducing power dissipation versus deriving bias from VIN. At VIN = 36 V and light load, this cuts quiescent loss by ~60%, directly improving system efficiency-especially critical in always-on industrial nodes where standby power matters.
What is the purpose of the BOOST pin in CS51412GDR8?
The BOOST pin in CS51412GDR8 supplies elevated base drive to the internal NPN power switch, ensuring deep saturation and minimizing VCE(sat). This reduces conduction losses and junction heating. A bootstrap capacitor (typically 0.1 µF) and fast diode (e.g., 1N4148) connected between BOOST and VSW implement this function, enabling high efficiency across the full input range.
Can CS51412GDR8 operate without connecting the BIAS pin?
Yes, CS51412GDR8 operates fully without the BIAS pin connected-it defaults to VIN-derived biasing. Leaving BIAS floating or unconnected is acceptable and results in standard operation. However, efficiency-particularly at high VIN and light load-is lower than when BIAS is actively supplied with 3.3–6.0 V. No damage occurs if BIAS is omitted.
CS51412GDR8 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
CS51412GDR8 FAQ
1.How can I place an order for CS51412GDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412GDR8 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 CS51412GDR8 reliable?
The price and inventory of CS51412GDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412GDR8 is usually 5 days.
3.What payment methods are accepted for CS51412GDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412GDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412GDR8?
CS51412GDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412GDR8 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 CS51412GDR8?
For technical support, including CS51412GDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412GDR8 requirements.
6.How does Aetrix verify that CS51412GDR8 is sourced from the original manufacturer or authorized distributors?
All CS51412GDR8 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 CS51412GDR8 meets industry standards.
7.What is the process for return or replacement of CS51412GDR8?
All CS51412GDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51412GDR8, 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 CS51412GDR8 part is unused and in its original packaging.
Return procedure for CS51412GDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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