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onsemi CS51414ED8G
- Part No.:
- CS51414ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51414ED8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,444
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Product details
Overview
CS51414ED8G 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 BOOST pin bootstrapping for reduced saturation voltage, and includes 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 CS51414ED8G datasheet, pinout, applications, or equivalent options, key selection considerations include its 520 kHz switching frequency, BIAS pin support (3.3–6.0 V), −40 °C to 85 °C temperature grade, SOIC-8 package, and functional pin-compatibility with LT1376.
Technical Context
The CS51414ED8G 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 ultrafast transient response independent of error amplifier bandwidth. Its internal transconductance error amplifier (6.4 mA/V) interfaces with the VFB pin (0.29–0.36 V foldback threshold) and VC pin (1.270 V reference), enabling simple compensation with a single 0.1 µF capacitor.
This device operates at 520 kHz nominal frequency (446–594 kHz range), features a dedicated BIAS pin for powering internal circuitry from a low-voltage rail (3.3–6.0 V), and reduces quiescent current to 20 µA in shutdown mode. It uses cycle-by-cycle current limiting (1.6–3.0 A limit) with foldback to ~1.5 A and frequency reduction to 130 kHz under overload, directly protecting the integrated NPN switch and external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal (446–594 kHz); enables compact magnetics and high power density designs. |
| Output Current | 1.5 A continuous; supported 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; suitable for automotive, industrial, and wide-input DC-DC applications. |
| BIAS Pin Voltage | 3.3 V to 6.0 V; allows internal circuitry to be powered externally, improving efficiency at high VIN/light load. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers current limit foldback and 4:1 frequency reduction during overloads/short circuits. |
| Shutdown Quiescent Current | 20 µA typical; enables ultra-low-power sleep mode when SHDNB is pulled low. |
| Thermal Shutdown Trip | 175–195 °C; protects die integrity under sustained overload or poor heatsinking. |
Pinout & Package
CS51414ED8G is housed in an SOIC-8 (Case 751) package with standard 1.27 mm pitch, rated for −40 °C to 85 °C operation and RoHS-compliant Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Bootstrap drive supply | Provides elevated base drive to on-chip NPN switch; reduces saturation voltage and improves efficiency. |
| VIN | Main power input | Supplies primary power to IC and collector of internal NPN switch; accepts 4.5–40 V. |
| VSW | Switch emitter node | Connects to inductor; swings negative during off-time; requires catch diode clamping. |
| BIAS | External bias rail input | Enables internal logic and error amplifier to run from 3.3–6.0 V supply, reducing dissipation at high VIN. |
| SHDNB | Active-low shutdown control | TTL-compatible input; pulls below 1.0 V to enter <20 µA sleep mode; internal pull-up active when floating. |
| GND | Power return | Common ground reference for all internal circuits and power switch emitter path. |
| VFB | Feedback input | Inverting input to error amplifier; regulates output by comparing against 1.270 V internal reference. |
| VC | Error amplifier output | Provides compensated error signal to PWM comparator; sensitive to >0.5 mA injection. |
Key Features
| Feature | Design Value |
|---|---|
| V2 control architecture | Delivers ultrafast transient response without requiring high-bandwidth error amplifier; simplifies loop compensation to one capacitor. |
| BOOST pin bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, lowering on-chip power loss and improving full-load efficiency. |
| BIAS pin operation | Allows internal bias rails to run from 3.3–6.0 V, cutting quiescent dissipation by >50% vs. VIN-powered operation at high input voltages. |
| Frequency & current foldback | Under short circuit, switches to 130 kHz and folds current limit to ~1.5 A, limiting junction temperature rise and protecting external FET/diode. |
| Soft-start via VC pin | Uses error amplifier's 25 µA source current charging 0.1 µF capacitor to achieve >5 ms controlled output ramp, eliminating inrush stress. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: 24 V battery-fed DC-DC conversion to 5 V/3.3 V for microcontrollers and sensors in harsh environments. IC Role / Device Role / Timing Role: Primary buck controller managing power delivery with wide input tolerance and thermal robustness. Use Value: BIAS pin enables efficient operation across cold-crank (6 V) to load-dump (40 V) conditions while maintaining <20 µA shutdown current. | Use Scenario: Compact 12 V-to-3.3 V point-of-load regulator for CAN/LIN interface ICs and EEPROMs. IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck controller providing stable low-noise supply with fast load-step response. Use Value: V2 architecture delivers sub-10 µs transient recovery; 520 kHz switching minimizes filter size without compromising EMI performance. |
| Programmable Logic Controllers | Telecom Remote Radio Units |
Use Scenario: DIN-rail mounted 48 V input power module converting to 5 V for FPGA I/O banks and auxiliary logic. IC Role / Device Role / Timing Role: High-current buck regulator with integrated switch and protection, simplifying board layout and BOM count. Use Value: On-chip current limiting and thermal shutdown eliminate need for external fault management circuitry, reducing system cost and footprint. | Use Scenario: Outdoor base station subsystem requiring reliable 28 V-to-12 V conversion with extended temperature operation. IC Role / Device Role / Timing Role: Industrial-grade buck controller supporting −40 °C to 85 °C ambient with robust short-circuit recovery. Use Value: Frequency foldback and current foldback jointly limit peak power dissipation to <1.5 W during sustained shorts, preventing thermal runaway. |
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; no BIAS pin; uses voltage-mode control instead of V2. | Lacks external bias option; less efficient at high VIN/light load; requires more complex compensation. | Choose when legacy design reuse or Linear Tech ecosystem integration is prioritized over efficiency optimization. |
| MP2315DJ-LF-Z | 500 kHz, 2 A, 4.5–26 V input; integrated MOSFETs; no BIAS pin; uses current-mode control. | Narrower VIN range; higher current rating; no thermal foldback or soft-start via VC pin. | Prefer for cost-sensitive, higher-current apps where 26 V max VIN suffices and external bias is unnecessary. |
Compared with LT1376CS8#PBF and MP2315DJ-LF-Z, CS51414ED8G uniquely combines 520 kHz operation, BIAS pin efficiency enhancement, V2 control for minimal compensation, and integrated foldback protection-making it optimal for wide-VIN industrial converters demanding reliability and light-load efficiency.
Availability
CS51414ED8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51414ED8G 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 designed specifically for high-efficiency, wide-input-voltage buck regulation in space-constrained industrial and automotive systems, emphasizing robust protection, simplified design, and thermal resilience.
FAQ
What is the maximum input voltage rating for CS51414ED8G?
The CS51414ED8G supports a maximum input voltage of 40 V on the VIN pin, with absolute maximum ratings specifying −0.3 V to 40 V. Exceeding this may damage the device. The BIAS pin has a separate 3.3–6.0 V operating range and must not exceed 7.0 V per absolute maximum ratings. This 40 V rating makes CS51414ED8G suitable for 24 V and 36 V industrial bus applications, including automotive load-dump scenarios.
Does CS51414ED8G support synchronization to an external clock?
No, CS51414ED8G does not support external synchronization. Only CS51411 and CS51413 variants include a SYNC pin; CS51414ED8G is designated as a "Bias" variant and replaces SYNC functionality with the BIAS pin. Its oscillator is factory-trimmed to 520 kHz and operates autonomously without external timing signals. Attempting to drive a clock signal onto any pin other than those defined in the datasheet may cause malfunction or damage to CS51414ED8G.
How does the BIAS pin improve efficiency in CS51414ED8G?
The BIAS pin in CS51414ED8G allows internal circuitry-including the error amplifier, comparators, and logic-to be powered from a low-voltage rail (3.3–6.0 V) instead of VIN. At high input voltages (e.g., 36 V), this reduces internal power dissipation significantly: quiescent current drawn from VIN drops, and predriver/base current paths shift away from high-VIN sources. Measured efficiency gains exceed 3% at light loads and 40 V input, making CS51414ED8G especially valuable in wide-VIN industrial converters where standby power matters.
What protection features are integrated into CS51414ED8G?
CS51414ED8G integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to ~130 kHz), current foldback (to ~1.5 A), and soft-start. These operate cooperatively: under short circuit, VFB falling below 0.29 V triggers simultaneous frequency and current reduction, limiting power dissipation and preventing thermal runaway. All protections are fully internal-no external components required-ensuring robust operation in unattended industrial equipment using CS51414ED8G.
Can CS51414ED8G be used with ceramic output capacitors?
Yes, CS51414ED8G is fully compatible with low-ESR ceramic output capacitors, including MLCCs. Its V2 control architecture does not rely on capacitor ESR for stability; instead, it derives the control ramp from inductor DCR sensing or voltage feed-forward networks. Application Note AND8276/D confirms stable operation with two parallel 10 µF X5R 0805 MLCCs, achieving <10 mV ripple. This eliminates the need for bulk tantalum or polymer capacitors, reducing cost and board area in designs using CS51414ED8G.
CS51414ED8G 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
CS51414ED8G FAQ
1.How can I place an order for CS51414ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414ED8G 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 CS51414ED8G reliable?
The price and inventory of CS51414ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414ED8G is usually 5 days.
3.What payment methods are accepted for CS51414ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414ED8G?
CS51414ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414ED8G 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 CS51414ED8G?
For technical support, including CS51414ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414ED8G requirements.
6.How does Aetrix verify that CS51414ED8G is sourced from the original manufacturer or authorized distributors?
All CS51414ED8G 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 CS51414ED8G meets industry standards.
7.What is the process for return or replacement of CS51414ED8G?
All CS51414ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51414ED8G, 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 CS51414ED8G part is unused and in its original packaging.
Return procedure for CS51414ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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