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onsemi CS51414GD8
- Part No.:
- CS51414GD8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51414GD8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,924
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Product details
Overview
CS51414GD8 from onsemi is a 1.5 A, 520 kHz fixed-frequency buck regulator IC with external bias capability and V² control architecture. It operates from 4.5 V to 40 V input, delivers ultrafast transient response via output-derived control ramp, and integrates an on-chip NPN power switch with BOOST pin for saturation optimization. It is used in industrial power supplies requiring high efficiency at light loads and high VIN.
For engineers reviewing the CS51414GD8 datasheet, pinout, applications, or equivalent options, key selection considerations include its 520 kHz switching frequency, BIAS pin support for 3.3–6.0 V auxiliary supply, thermal shutdown at 175–195 °C, foldback current limiting (0.9–2.1 A), and SOIC-8 package compatibility with LT1376.
Technical Context
The CS51414GD8 implements V² control, where the PWM comparator receives both DC error (via VC) and AC ripple-derived ramp directly from VFB - eliminating need for external slope compensation and enabling >10 kHz closed-loop bandwidth. Its internal transconductance error amplifier (6.4 mA/V) and 500 kHz unity-gain bandwidth simplify compensation using only a 0.1 µF capacitor from VC to GND.
This device uses a single-stage NPN power switch biased via BOOST pin (requiring external bootstrap diode/capacitor), with BIAS pin enabling independent 3.3–6.0 V supply for control circuitry - reducing quiescent dissipation by routing bias current away from VIN during high-input, light-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal (446–594 kHz range); enables compact magnetics and low-output-ripple designs. |
| Output Current | 1.5 A continuous; limited by on-chip NPN transistor with 0.4–1.0 V saturation voltage at 1.5 A. |
| Input Voltage Range | 4.5 V to 40 V; supports wide industrial and automotive battery-fed inputs. |
| BIAS Pin Voltage | 3.3 V to 6.0 V; allows efficient biasing of internal circuitry independent of VIN, improving light-load efficiency. |
| Thermal Shutdown | 175–195 °C trip point with 42 °C hysteresis; protects against sustained overload or poor heatsinking. |
| Current Limit Threshold | 1.6–3.0 A (normal), 0.9–2.1 A (foldback mode); provides cycle-by-cycle protection and short-circuit power reduction. |
| Reference Voltage | 1.244–1.296 V at VFB; 2.0% tolerance enables precise output regulation with standard resistor dividers. |
Pinout & Package
CS51414GD8 is housed in an SOIC-8 (Case 751) package with 1.27 mm pitch, RoHS-compliant Pb-free finish, and rated for −40 °C to 85 °C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive node | Provides elevated base drive to NPN switch; requires external 0.1 µF capacitor + Schottky diode to maintain saturation and minimize on-resistance. |
| 2,3,4 - VIN | Main power input | Supplies collector of internal NPN switch and high-side bias rails; accepts 4.5–40 V with −0.3 V absolute minimum. |
| 5,6,7 - VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns max); requires catch diode and short PCB trace for EMI control. |
| 8 - BIAS | Auxiliary bias supply | Accepts 3.3–6.0 V external supply to power internal logic, reducing VIN current draw and improving efficiency at high VIN/light load. |
| - SHDNB | Active-low shutdown | TTL-compatible input; pulls <1.0 V to enter sleep mode (<85 µA quiescent); internal pull-up enables default-on operation. |
| - GND | Power return | Common reference for all internal circuits and external components; must be low-impedance connection to minimize noise coupling. |
| - VFB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider; triggers frequency/current foldback below 0.29 V. |
| - VC | Error amplifier output | Provides PWM comparator input; clamped to limit overcurrent recovery time; avoid external current injection >0.5 mA. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Enables >10 kHz closed-loop bandwidth without external slope compensation; achieves sub-10 µs load transient recovery. |
| BOOST pin bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting on-chip conduction loss by up to 40% vs non-bootstrapped operation. |
| BIAS pin support | Allows control circuitry to run from 3.3–6.0 V supply, lowering total IC dissipation by ~3.5 mW per volt above 6 V VIN. |
| Frequency and current foldback | Under short circuit, switches to 130 kHz and limits peak current to ≤2.1 A, reducing IC power dissipation by >65%. |
| Soft-start via VC capacitor | Uses error amplifier's 15–35 µA source current to charge external 0.1 µF capacitor, achieving ~5 ms controlled output ramp without extra pins. |
Applications
| Industrial 24 V DC-DC Conversion | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Converting 24 V vehicle battery to 5 V/3.3 V for microcontrollers and sensors in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated low-voltage rail with BIAS pin powered from 5 V LDO to maximize efficiency at partial load. Use Value: Enables >88% efficiency at 100 mA load with 24 V input, extending module runtime and reducing thermal stress on PCB. |
Use Scenario: Powering CAN transceiver and EEPROM in rear-view mirror control unit with cold-crank immunity down to 4.5 V. IC Role / Device Role / Timing Role: Input-wide buck controller maintaining stable 3.3 V output during engine start (6–16 V transients) using V² loop stability. Use Value: Delivers uninterrupted 3.3 V supply across full cold-crank profile without brownout, verified by <100 mV output deviation under 1 A step load. |
| Programmable Logic Controller (PLC) I/O Module | Industrial IoT Sensor Hub |
Use Scenario: Generating isolated 5 V rail for digital I/O conditioning circuits in DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: High-reliability buck stage with thermal shutdown and cycle-by-cycle current limiting protecting against field-wiring faults. Use Value: Survives sustained 2 A short-circuit events for >30 s without latch-off, thanks to foldback frequency (130 kHz) and reduced current limit (1.5 A typical). |
Use Scenario: Powering ARM Cortex-M4 MCU, LoRa transceiver, and analog sensor front-end in battery-backed environmental monitor. IC Role / Device Role / Timing Role: Efficient 12 V to 3.3 V conversion with shutdown control synchronized to MCU sleep states via SHDNB pin. Use Value: Achieves <20 µA system standby current when CS51414GD8 is disabled, meeting 10-year battery life target for remote deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376CS8-5 | Pin-compatible, 500 kHz, 1.5 A; no BIAS pin; uses current-mode control instead of V². | Lacks efficiency optimization at high VIN/light load; requires external slope compensation for stability. | Select when legacy LT1376 layout reuse is required and BIAS functionality is unnecessary. |
| MP2451DT-LF-Z | 500 kHz, 2 A, 4.5–36 V; integrated MOSFET; no BOOST/BIAS pins; uses constant-on-time control. | Higher current rating but lower VIN max; lacks foldback protection and V² transient performance. | Select for cost-sensitive, higher-current apps where 10 µs transient response is not critical. |
Compared with LT1376CS8-5 and MP2451DT-LF-Z, the CS51414GD8 uniquely combines V² control for ultrafast transient response, BIAS pin for high-VIN efficiency, and foldback protection - making it optimal for industrial systems demanding reliability across wide input and load ranges.
Availability
CS51414GD8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51414GD8 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-density, high-efficiency DC-DC conversion in space-constrained industrial and automotive systems - emphasizing robustness, wide input range, and simplified design through V² architecture.
FAQ
What is the maximum input voltage rating for the CS51414GD8?
The CS51414GD8 supports an absolute maximum input voltage of 40 V on the VIN pin, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V risks permanent damage per the Absolute Maximum Ratings table. The device maintains regulation and protection features across this full range, including thermal shutdown activation at 175–195 °C junction temperature.
Does the CS51414GD8 require external slope compensation?
No, the CS51414GD8 does not require external slope compensation due to its V² control architecture. The feedback signal (VFB) inherently provides the AC ramp component needed for PWM comparison, eliminating instability risks associated with duty cycles >50%. This simplifies design and reduces bill-of-materials cost compared to traditional current-mode controllers.
How does the BIAS pin improve efficiency in the CS51414GD8?
The BIAS pin in the CS51414GD8 allows internal control circuitry to be powered from an external 3.3–6.0 V supply instead of VIN. At high input voltages (e.g., 24 V) and light loads, this reduces power dissipated in on-chip regulators by bypassing the VIN-to-bias LDO path - resulting in measurable efficiency gains, especially below 200 mA output current.
What happens to the CS51414GD8 during a short-circuit condition?
During short circuit, the CS51414GD8 activates dual foldback protection: VFB falling below 0.29 V reduces switching frequency to ~130 kHz (25% of nominal) and lowers current limit to 0.9–2.1 A. This cuts power dissipation in both the IC and external components, preventing thermal runaway while maintaining safe operating conditions for >30 seconds.
Is the CS51414GD8 pin-compatible with any industry-standard alternatives?
Yes, the CS51414GD8 is functionally pin-compatible with the LT1376 in SOIC-8 package. Pin mapping matches for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and BIAS (replacing LT1376's SYNC). This enables drop-in replacement in existing LT1376 designs where improved light-load efficiency and V² transient response are desired.
CS51414GD8 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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51414GD8 FAQ
1.How can I place an order for CS51414GD8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414GD8 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 CS51414GD8 reliable?
The price and inventory of CS51414GD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414GD8 is usually 5 days.
3.What payment methods are accepted for CS51414GD8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414GD8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414GD8?
CS51414GD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414GD8 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 CS51414GD8?
For technical support, including CS51414GD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414GD8 requirements.
6.How does Aetrix verify that CS51414GD8 is sourced from the original manufacturer or authorized distributors?
All CS51414GD8 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 CS51414GD8 meets industry standards.
7.What is the process for return or replacement of CS51414GD8?
All CS51414GD8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51414GD8, 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 CS51414GD8 part is unused and in its original packaging.
Return procedure for CS51414GD8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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