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onsemi CS51414GDR8
- Part No.:
- CS51414GDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51414GDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
CS51414GDR8 from onsemi is a 1.5 A, 520 kHz fixed-frequency buck regulator IC with external bias capability, operating from 4.5 V to 40 V input and delivering tightly regulated output voltage via V2 control architecture. It integrates an on-chip NPN power switch, supports soft-start, thermal shutdown, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection. It is used in industrial power supplies requiring high efficiency at light loads and wide VIN ranges.
For engineers reviewing the CS51414GDR8 datasheet, pinout, applications, or equivalent options, key selection criteria include its 520 kHz switching frequency, BIAS pin support for efficiency optimization at high VIN/low load, V2 control for ultrafast transient response, and SOIC-8 package compatibility with LT1376-based designs.
Technical Context
The CS51414GDR8 implements V2 control architecture-using both DC and AC components of the feedback signal (VFB) as inputs to the PWM comparator-to achieve load-transient response independent of error amplifier bandwidth. Its internal transconductance error amplifier (6.4 mA/V) drives the VC node, enabling simple compensation with only a 0.1 µF capacitor to ground.
It features dual protection modes: when VFB falls below 0.29 V, it activates frequency foldback (reducing switching frequency to 130 kHz) and current limit foldback (to ~1.5 A), while the BIAS pin (3.3–6.0 V) powers internal circuitry separately to reduce VIN-related quiescent loss-critical for high-input-voltage, light-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz ±14% - enables compact magnetics and low-output-ripple design with fast transient response. |
| Output Current | 1.5 A continuous - delivered by integrated NPN transistor with saturation voltage ≤0.7 V at 1.5 A, minimizing conduction loss. |
| Input Voltage Range | 4.5 V to 40 V - supports wide industrial and automotive supply rails without pre-regulation. |
| BIAS Pin Voltage | 3.3 V to 6.0 V - allows external low-voltage rail to power control circuitry, reducing IC power dissipation at high VIN. |
| VFB Foldback Threshold | 0.29 V to 0.36 V - triggers frequency and current foldback during overload, limiting junction temperature rise and protecting external components. |
| Shutdown Quiescent Current | 20 µA typical - ensures ultra-low standby power when SHDNB is pulled low, suitable for battery-backed systems. |
| Thermal Shutdown Trip | 175 °C to 195 °C - protects against sustained overloads; hysteresis of 42 °C prevents thermal cycling. |
Pinout & Package
CS51414GDR8 is housed in an SOIC-8 (D suffix, Case 751) package with standard 1.27 mm pitch, Pb-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Bootstrap drive node | Provides elevated base drive to the internal NPN switch; connected to external capacitor-diode network to minimize saturation voltage and improve efficiency. |
| VIN | Main power input | Supplies collector of internal NPN switch and bias for high-side driver; rated up to 40 V with −0.3 V reverse tolerance. |
| VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (t < 50 ns) during flyback; requires catch diode and short PCB routing for EMI control. |
| BIAS | External bias rail input | Enables powering internal logic from 3.3–6.0 V source instead of VIN-reducing quiescent loss and improving efficiency at high VIN/low load. |
| GND | Power return | Common reference for all internal circuits; must be low-impedance connection to minimize noise coupling into VFB and VC nodes. |
| VFB | Feedback input | Inverting input of error amplifier; regulates output by comparing against 1.270 V internal reference; triggers foldback below 0.29 V. |
| VC | Error amplifier output | Provides PWM comparator input; clamped to limit overdrive; compensation capacitor (0.1 µF) sets dominant pole for stable loop response. |
| SHDNB | Active-low shutdown | TTL-compatible input with internal pull-up; pulls below 1.0 V to enter sleep mode (<85 µA IQ); floating defaults to enabled. |
Key Features
| Feature | Design Value |
|---|---|
| V2 control architecture | Delivers load-transient response independent of error amplifier bandwidth-enabling stable regulation with minimal compensation components. |
| Frequency foldback under fault | Reduces switching frequency to 25% of nominal (130 kHz) when VFB < 0.29 V, lowering power dissipation in short-circuit conditions. |
| BIAS pin efficiency enhancement | Allows internal circuitry to run from 3.3–6.0 V rail instead of VIN, cutting quiescent loss by >50% at VIN = 24 V and light load. |
| Integrated NPN switch with BOOST | On-chip 1.5 A NPN transistor driven via BOOST pin; achieves ≤0.7 V saturation at full load, minimizing die heating and simplifying layout. |
| Soft-start via VC node | Uses error amplifier's output source current (25 µA typ.) charging VC compensation capacitor-no external timing component required. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V vehicle battery input converted to 5 V/1.5 A for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5 V rail with fast load-step response to handle intermittent actuator activation. Use Value: V2 control ensures <50 µs recovery from 1 A load step; BIAS pin improves light-load efficiency by 8–12% vs. VIN-powered operation. | Use Scenario: 12–36 V unregulated bus in body control unit powering MCU, EEPROM, and LIN interface. IC Role / Device Role / Timing Role: Fixed-frequency buck converter delivering stable 3.3 V rail with thermal foldback for reliability in under-hood environments. Use Value: Thermal shutdown (175–195 °C trip) and frequency foldback protect against sustained overloads in sealed enclosures. |
| Programmable Logic Controller (PLC) I/O Module | Industrial IoT Gateway |
Use Scenario: DIN-rail mounted PLC module converting 24 V DC to isolated 5 V and 3.3 V rails for digital I/O and communication ASICs. IC Role / Device Role / Timing Role: High-VIN buck regulator supporting wide input range and meeting EN 61000-4-5 surge immunity via robust VSW node design. Use Value: VSW rating to −1.0 V (t < 50 ns) accommodates flyback energy without clamp diode overstress; SOIC-8 eases conformal coating and thermal pad integration. | Use Scenario: Edge gateway with cellular/Wi-Fi SoC requiring efficient 3.3 V @ 1.2 A from 12–40 V field power. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC stage with soft-start and shutdown control for remote firmware updates and low-power sleep modes. Use Value: 20 µA shutdown current extends battery backup runtime; 0.1 µF VC compensation enables rapid design iteration without stability analysis. |
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, 500 kHz, 1.5 A, but uses voltage-mode control and lacks BIAS pin; higher IQ (6 mA vs. 6.25 mA typ. active). | No external bias option; less efficient at VIN > 15 V and light load; no V2 transient advantage. | Select if legacy LT1376 footprint reuse is mandatory and V2 performance is not required. |
| MP2451DT-LF-Z | 500 kHz, 2 A, 4.5–36 V, but uses current-mode control; no BIAS pin; requires external compensation; smaller TSOT23-8 package. | Higher current rating but lower max VIN; no integrated foldback frequency; less robust under short-circuit stress. | Select for cost-sensitive, space-constrained designs where 2 A output and smaller footprint outweigh foldback protection needs. |
Compared with LT1376CS8#PBF and MP2451DT-LF-Z, CS51414GDR8 uniquely combines V2 ultrafast transient response, BIAS-driven efficiency optimization at high VIN, and integrated frequency/current foldback-making it optimal for industrial and automotive applications demanding reliability across wide load and temperature ranges.
Availability
CS51414GDR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, programmable logic controller I/O modules, and industrial IoT gateways requiring stable component supply with long-term lifecycle support.
Supply support for CS51414GDR8 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 product line was designed specifically for high-efficiency, wide-input-voltage buck conversion in space- and thermally constrained industrial and automotive systems-emphasizing robust fault handling, simplified compensation, and adaptive biasing.
FAQ
What is the maximum input voltage rating for CS51414GDR8?
The CS51414GDR8 has a maximum rated input voltage of 40 V on the VIN pin, with absolute minimum of −0.3 V. This 4.5 V to 40 V operating range makes CS51414GDR8 suitable for 24 V industrial buses and 12–36 V automotive applications. Exceeding 40 V may cause permanent damage per the Absolute Maximum Ratings table.
Does CS51414GDR8 support synchronization to an external clock?
No, CS51414GDR8 does not support external synchronization. Only CS51411 and CS51413 variants include the SYNC pin; CS51414GDR8 is the BIAS-enabled, 520 kHz version without sync capability. Its oscillator is factory-trimmed and operates autonomously at 520 kHz ±14%.
How does the BIAS pin improve efficiency in CS51414GDR8?
The BIAS pin in CS51414GDR8 allows internal control circuitry to be powered from a 3.3–6.0 V rail instead of VIN, reducing power dissipation-especially at high VIN and light load. For example, at VIN = 24 V and 10 mA load, using BIAS cuts quiescent loss by >50% versus VIN-powered operation, directly improving system efficiency.
What protection features are built into CS51414GDR8?
CS51414GDR8 includes thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 130 kHz), current limit foldback (to 0.9–2.1 A), soft-start, and under-voltage lockout (startup at 2.2–4.4 V). These operate autonomously without external components to safeguard the IC and external power stage.
Is CS51414GDR8 pin-compatible with any industry-standard regulators?
Yes, CS51414GDR8 is functionally pin-compatible with Linear Technology's LT1376 in SOIC-8 package. Pin mapping matches for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and BIAS (vs. LT1376's BIAS pin), enabling drop-in replacement in existing LT1376 designs-provided the BIAS supply meets 3.3–6.0 V requirements.
CS51414GDR8 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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51414GDR8 FAQ
1.How can I place an order for CS51414GDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414GDR8 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 CS51414GDR8 reliable?
The price and inventory of CS51414GDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414GDR8 is usually 5 days.
3.What payment methods are accepted for CS51414GDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414GDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414GDR8?
CS51414GDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414GDR8 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 CS51414GDR8?
For technical support, including CS51414GDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414GDR8 requirements.
6.How does Aetrix verify that CS51414GDR8 is sourced from the original manufacturer or authorized distributors?
All CS51414GDR8 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 CS51414GDR8 meets industry standards.
7.What is the process for return or replacement of CS51414GDR8?
All CS51414GDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51414GDR8, 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 CS51414GDR8 part is unused and in its original packaging.
Return procedure for CS51414GDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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