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onsemi CS51412EDR8G
- Part No.:
- CS51412EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412EDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,939
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Product details
Overview
CS51412EDR8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with external BIAS supply capability, V² control architecture, and integrated NPN power switch. It operates from 4.5 V to 40 V input, delivers regulated output via external inductor/diode, and targets high-efficiency DC-DC conversion in industrial power supplies and automotive subsystems.
For engineers reviewing the CS51412EDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include its BIAS-enabled efficiency optimization at high VIN/low IOUT, 0.29 V frequency foldback threshold, thermal shutdown at 175–195 °C, and SOIC-8 package compatibility with LT1376-based designs.
Technical Context
The CS51412EDR8G implements V² control architecture, using the output voltage ripple as both DC setpoint and AC control ramp-enabling ultrafast transient response independent of error amplifier bandwidth. Its transconductance error amplifier (6.4 mA/V) drives the VC pin for PWM comparator input, with internal 1.270 V reference and 500 kHz unity-gain bandwidth.
This device integrates an on-chip NPN power switch rated for ≥1.5 A continuous output, biased via BOOST pin for saturation voltage minimization (0.4–1.0 V typical), and supports external BIAS supply (3.3–6.0 V) to reduce quiescent dissipation-particularly beneficial under high-input-voltage, light-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz ±13% - enables compact magnetics and EMI filtering; line regulation ≤0.15%/V ensures stable operation across input range. |
| Output Current | 1.5 A minimum - sustained by integrated NPN switch with 0.4–1.0 V saturation voltage at 1.5 A, reducing conduction loss. |
| Input Voltage Range | 4.5 V to 40 V - supports wide industrial and automotive battery-fed inputs without pre-regulation. |
| BIAS Supply Range | 3.3 V to 6.0 V - powers internal circuitry independently to cut quiescent dissipation; not present in sync-capable variants. |
| Frequency Foldback Threshold | 0.29–0.36 V on VFB - triggers 4:1 frequency reduction and current limit foldback (0.9–2.1 A) during overload/short-circuit. |
| Thermal Shutdown Trip | 175–195 °C - protects die integrity; hysteresis ≥42 °C prevents oscillation near trip point. |
| Shutdown Quiescent Current | 20 µA typical - achieved via active-low SHDNB pin with internal pull-up; draws <85 µA in sleep mode. |
Pinout & Package
CS51412EDR8G is housed in an SOIC-8 (Case 751) package with standard 1.27 mm pitch, 5.0 mm × 6.2 mm body, and exposed pad for thermal relief (not electrically connected). Pin 1 is marked with a dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive node | Provides elevated base drive to NPN switch; connects to external capacitor-diode network to minimize VCE(sat) and improve efficiency. |
| 2,3,4 - VIN | Main power input | Supplies collector of internal NPN switch and bias rails; accepts 4.5–40 V; multiple pins reduce trace resistance and thermal stress. |
| 5 - VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (t < 50 ns); requires catch diode and short PCB routing to limit EMI. |
| 6 - BIAS | External bias rail input | Enables 3.3–6.0 V auxiliary supply to power control circuitry-reducing VIN-derived dissipation and improving light-load efficiency. |
| 7 - GND | Power return | Common reference for all internal circuits and switch emitter; must be low-impedance connection to minimize noise coupling. |
| 8 - VFB | Feedback input | Connects to resistor divider from output; 0.29 V threshold initiates foldback protection; input bias current ≤0.1 µA preserves accuracy. |
| NC (Pins 9–18) | No connection | Not bonded in SOIC-8 variant; unused in this package; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Delivers ultrafast load transient response without requiring high-bandwidth error amplifier compensation-enables stable loop with only 0.1 µF VC-to-GND capacitor. |
| External BIAS Capability | Reduces IC power dissipation by powering control circuitry from regulated output or auxiliary rail (3.3–6.0 V), improving efficiency >5% at VIN = 24 V, IOUT < 100 mA. |
| Frequency & Current Foldback | Under VFB < 0.29 V, switching frequency drops to 65 kHz and peak current limit folds to ~1.5 A-limiting power dissipation and protecting switch/diode during short-circuit. |
| Soft-Start via VC Pin | Uses error amplifier output source current (15–35 µA) charging external VC capacitor to ramp output voltage gradually-eliminates need for dedicated soft-start pin or circuitry. |
| Thermal Shutdown + Hysteresis | Triggers at 175–195 °C junction temperature with ≥42 °C hysteresis-prevents thermal cycling and ensures safe recovery before restart. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 12–24 V battery rail to 3.3 V or 5 V for microcontrollers and sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC output with BIAS-driven efficiency at partial load. Use Value: Maintains >88% efficiency at 24 VIN/5 VOUT/100 mA due to BIAS operation, reducing thermal load in enclosed enclosures. |
Use Scenario: Powering CAN transceivers, door lock actuators, and interior lighting controllers in 12 V vehicle systems. IC Role / Device Role / Timing Role: High-reliability step-down regulator with thermal shutdown and short-circuit foldback for safety-critical subsystems. Use Value: Survives load dump (up to 40 V) and cold-crank (down to 4.5 V) while delivering 1.5 A peak current for solenoid actuation pulses. |
| Point-of-Load Converter | Legacy Equipment Retrofit |
Use Scenario: Generating 3.3 V from 5–15 V intermediate bus for FPGA I/O banks or high-speed ADCs in test equipment. IC Role / Device Role / Timing Role: Compact, self-contained buck controller with V² loop stability-no external compensation required. Use Value: Achieves <50 µs transient recovery time to ±2% regulation after 1 A load step, preserving signal integrity in measurement systems. |
Use Scenario: Replacing obsolete LT1376-based regulators in aging telecom or medical power modules. IC Role / Device Role / Timing Role: Pin-compatible functional replacement with identical SOIC-8 footprint and BIAS functionality. Use Value: Enables drop-in upgrade without PCB redesign; maintains same layout, feedback network, and inductor selection. |
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 | Same SOIC-8 pinout, 1.5 A rating, 250 kHz nominal frequency; no BIAS pin-internal bias derived solely from VIN. | Lacks BIAS efficiency optimization; higher quiescent dissipation at high VIN/low IOUT; no foldback hysteresis spec. | Choose when legacy design reuse is critical and BIAS efficiency gain is unnecessary. |
| MP2315DJ-LF-Z | 2 A rating, 500 kHz switching, integrated MOSFETs; no BOOST/BIAST pins; requires external compensation. | Higher current, smaller solution size, but lacks V² control-slower transient response and more complex loop tuning. | Prefer for new designs needing >1.5 A or higher frequency; avoid if V²'s fast transient response is required. |
Compared with LT1376CS8#PBF, CS51412EDR8G adds BIAS-driven efficiency and tighter foldback protection; versus MP2315DJ-LF-Z, it trades higher integration for superior transient performance and simpler design-making it optimal for reliability-critical, medium-current industrial converters.
Availability
CS51412EDR8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and point-of-load converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51412EDR8G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS51412EDR8G belongs to onsemi's high-performance analog power management portfolio, designed specifically for rugged, high-efficiency DC-DC conversion in harsh environments where thermal resilience and transient robustness are critical.
FAQ
What is the function of the BIAS pin on the CS51412EDR8G?
The BIAS pin on the CS51412EDR8G accepts an external 3.3 V to 6.0 V supply to power the internal control circuitry-bypassing VIN-derived bias current. This reduces total IC power dissipation, especially at high input voltages and light loads. When unused, the BIAS pin must be left floating; connecting it to ground or VIN will disable the feature or cause malfunction. The CS51412EDR8G datasheet specifies 6.0 mA to 40 mA boost operating current per ampere of output current, confirming BIAS's role in optimizing efficiency.
Does the CS51412EDR8G support synchronization with an external clock?
No, the CS51412EDR8G does not support synchronization. It is part of the "Bias" variant group (CS51412/CS51414), which replaces the SYNC pin found on CS51411/CS51413 with the BIAS pin. The datasheet explicitly states that CS51412 and CS51414 have "the option of powering the controller from an external 3.3 V to 6.0 V supply" and omits SYNC functionality entirely. Attempting to drive a clock signal into pin 5 (BIAS) will not synchronize the CS51412EDR8G and may damage the pin.
What is the maximum allowable voltage on the BOOST pin of the CS51412EDR8G?
The maximum allowable voltage on the BOOST pin of the CS51412EDR8G is 40 V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage-even momentarily-may damage the internal NPN switch driver. During normal bootstrapped operation, BOOST voltage equals VIN + VOUT − VF (diode forward drop), so designers must ensure VIN + VOUT stays below 40 V + VF. The CS51412EDR8G datasheet also notes that BOOST can sink up to 100 mA, and its minimum operating voltage is −0.3 V, allowing safe flyback clamping.
How does the CS51412EDR8G implement soft-start without a dedicated pin?
The CS51412EDR8G implements soft-start intrinsically through its VC pin: the error amplifier's output source current (15–35 µA typical) charges an external capacitor connected between VC and GND. As the capacitor voltage ramps, it directly modulates the PWM comparator threshold, causing output voltage to rise gradually. With a 0.1 µF capacitor, soft-start duration exceeds 5 ms-sufficient to prevent inrush current stress on the inductor, catch diode, and output capacitors. This eliminates external soft-start circuitry while maintaining precise control over ramp rate.
Is the CS51412EDR8G pin-compatible with the LT1376?
Yes, the CS51412EDR8G is functionally pin-compatible with the LT1376, as confirmed in the onsemi datasheet: "The CS51412 and CS51414 are functionally pin-compatible with the LT1376." Both use SOIC-8 packages with identical pin assignments for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and BIAS/SYNC (where CS51412EDR8G maps BIAS to LT1376's SYNC location). However, the BIAS functionality differs from LT1376's SYNC behavior-designers must reconfigure feedback and enable logic accordingly for full drop-in replacement.
CS51412EDR8G 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
CS51412EDR8G FAQ
1.How can I place an order for CS51412EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412EDR8G 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 CS51412EDR8G reliable?
The price and inventory of CS51412EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412EDR8G is usually 5 days.
3.What payment methods are accepted for CS51412EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412EDR8G?
CS51412EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412EDR8G 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 CS51412EDR8G?
For technical support, including CS51412EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412EDR8G requirements.
6.How does Aetrix verify that CS51412EDR8G is sourced from the original manufacturer or authorized distributors?
All CS51412EDR8G 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 CS51412EDR8G meets industry standards.
7.What is the process for return or replacement of CS51412EDR8G?
All CS51412EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51412EDR8G, 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 CS51412EDR8G part is unused and in its original packaging.
Return procedure for CS51412EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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