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onsemi CS51414EDR8
- Part No.:
- CS51414EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51414EDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
CS51414EDR8 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 - used in industrial power supplies and automotive body electronics.
For engineers reviewing the CS51414EDR8 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 CS51414EDR8 implements V2 control architecture, where both inputs to the PWM comparator derive from the output voltage - one via fast feedback (AC+DC) with slope compensation, the other via slow feedback (error amplifier output VC) - enabling transient response independent of error amplifier bandwidth while ensuring DC accuracy. It uses an internal transconductance error amplifier with 1.270 V reference and 500 kHz unity-gain bandwidth.
This device operates at 520 kHz nominal frequency (446–594 kHz range), features frequency foldback to 130 kHz under short-circuit (VFB < 0.29 V), and supports external synchronization only in CS51411/CS51413 variants - CS51414EDR8 excludes SYNC but includes BIAS pin for powering internal circuitry from 3.3–6.0 V supply to reduce quiescent dissipation at high input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal (446–594 kHz); enables compact magnetics and low-output-ripple designs with minimal EMI filtering. |
| Output Current | 1.5 A continuous; supported by on-chip NPN transistor with 0.7 V typical saturation voltage at 1.5 A and BOOST-assisted drive. |
| Input Voltage Range | 4.5 V to 40 V; accommodates wide industrial and automotive battery-supplied systems without pre-regulation. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction to 25% and current limit foldback to ~1.5 A, limiting power dissipation during overload. |
| BIAS Pin Voltage Range | 3.3 V to 6.0 V; allows powering internal bias rails externally to cut IC quiescent loss - critical for >24 V input, light-load efficiency. |
| Shutdown Quiescent Current | 20 µA typical; achieved via active-low SHDNB pin with internal pull-up, enabling ultra-low-power sleep mode. |
| Thermal Shutdown Trip | 175–195 °C; protects against sustained overloads with 42 °C hysteresis to prevent oscillation near trip point. |
Pinout & Package
CS51414EDR8 is housed in an SOIC-8 (D suffix, Case 751) package with standard 1.27 mm pitch and exposed pad not present; thermal performance relies on PCB copper area connected to GND pin (Pin 6).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive supply | Provides elevated base drive to on-chip NPN switch; reduces saturation voltage and improves efficiency - requires external 0.1 µF capacitor and diode. |
| 2,3,4: VIN | Main power input | Supplies collector of internal NPN switch and bias circuitry; accepts 4.5–40 V; multiple pins reduce trace resistance and improve thermal path. |
| 5,6,7: VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns max); requires catch diode and short, low-inductance routing to minimize EMI. |
| 8: BIAS | External bias rail input | Accepts 3.3–6.0 V to power internal logic and error amplifier - bypasses VIN LDO, cutting quiescent loss at high input voltages. |
| -: SHDNB | Active-low shutdown | TTL-compatible input; pulls below 1.0 V to enter sleep mode (<85 µA ICC); internal pull-up eliminates need for external resistor. |
| -: GND | Power return | Common reference for all internal circuits; must be low-impedance connection to minimize noise coupling into VFB and VC paths. |
| -: VFB | Feedback input | Connects to resistor divider from output; 0.29 V threshold initiates foldback; high-impedance (0.1 µA bias) minimizes divider loading. |
| -: VC | Error amplifier output | Provides access to compensation node; 0.1 µF capacitor to GND sets dominant pole - no additional components needed for stable V2 loop. |
Key Features
| Feature | Design Value |
|---|---|
| V2 control architecture | Enables sub-10 µs load transient response without complex compensation - regulation stability maintained using only 0.1 µF VC-to-GND capacitor. |
| BOOST pin bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss by up to 40% versus non-bootstrapped operation. |
| BIAS pin efficiency mode | Lowers quiescent current dissipation by >60% at VIN = 36 V, enabling >88% efficiency at 100 mA load (per Figure 10 data). |
| Frequency & current foldback | Under short-circuit, switches to 130 kHz and limits peak current to ~1.5 A - reduces IC junction temperature rise by ≥35 °C vs. full-frequency operation. |
| Soft-start via VC ramp | Uses error amplifier's 25 µA source current charging 0.1 µF capacitor to achieve ~5 ms controlled output voltage ramp - prevents inrush stress on output caps and diode. |
Applications
| Industrial 24 V Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V vehicle battery to 5 V/1.5 A for microcontroller, CAN transceiver, and sensor interface in door module. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-controlled 5 V rail with BIAS pin powered from 5 V output to maximize light-load efficiency. Use Value: Achieves >90% efficiency at 100 mA load and withstands cold-crank (4.5 V) to load-dump (40 V) transients per ISO 7637-2. |
Use Scenario: Generating 3.3 V @ 1.2 A from 12 V battery for infotainment MCU and display backlight driver in center console. IC Role / Device Role / Timing Role: Fixed-frequency (520 kHz) buck controller with V2 loop ensuring <50 mV output deviation during 1 A load steps at 10 kHz. Use Value: Eliminates need for external compensation network; soft-start prevents display flicker during ignition-on power-up. |
| Programmable Logic Controller (PLC) I/O Module | Industrial Motor Drive Auxiliary Supply |
|
Use Scenario: Providing 5 V @ 1.5 A for digital I/O isolation, ADC reference, and FPGA configuration in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: High-input-voltage buck regulator using BOOST and BIAS pins to sustain >85% efficiency across 12–36 V input range. Use Value: Thermal shutdown (185 °C trip) and foldback protect against sustained overloads during field wiring faults. |
Use Scenario: Deriving 15 V @ 0.8 A auxiliary supply from 40 V DC bus for gate drivers and op-amps in servo amplifier stage. IC Role / Device Role / Timing Role: Robust buck controller handling 40 V max input with integrated current limiting and VSW flyback clamping. Use Value: On-chip 3 A current limit and 130 kHz foldback prevent MOSFET driver damage during IGBT shoot-through events. |
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, no BIAS pin; uses current-mode control instead of V2; higher quiescent current (6 mA vs. 6.25 mA typical). | Lacks BIAS efficiency mode - less suitable for high-VIN, light-load scenarios; requires external compensation. | Select when legacy LT1376 layout reuse is required and BIAS-driven efficiency gains are non-critical. |
| MP2451DT-LF-Z | 36 V max input, 2 A output, 340 kHz, no BIAS or BOOST pins; uses constant-on-time control; smaller 8-pin SOIC package. | No external bias option or bootstrapping - lower peak efficiency above 24 V; lacks frequency foldback protection. | Prefer for cost-sensitive, space-constrained designs where 520 kHz switching and robust short-circuit protection are secondary. |
Compared with LT1376CS8#PBF and MP2451DT-LF-Z, CS51414EDR8 delivers superior transient response via V2 architecture, higher efficiency at 24–40 V inputs due to BIAS pin, and stronger fault protection through coordinated frequency/current foldback - making it optimal for demanding industrial and automotive power rails.
Availability
CS51414EDR8 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and programmable logic controller (PLC) power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51414EDR8 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.
CS51414EDR8 belongs to the CS5141X family of high-efficiency buck regulators designed specifically for wide-input-voltage industrial and automotive power conversion where reliability, thermal resilience, and transient performance are critical.
FAQ
What is the maximum input voltage rating for CS51414EDR8?
The CS51414EDR8 has an absolute maximum input voltage rating of 40 V on the VIN pins, 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 functionality across this full range, including cold-crank (4.5 V) and load-dump (40 V) conditions common in automotive systems.
Does CS51414EDR8 support external clock synchronization?
No, CS51414EDR8 does not support external synchronization. Synchronization capability is exclusive to CS51411 and CS51413 variants (which feature SYNC pin). CS51414EDR8 omits the SYNC pin and instead provides the BIAS pin for external biasing - a functional trade-off confirmed in the Product Selection Guide and PACKAGE PIN DESCRIPTION sections of the datasheet.
How does the BIAS pin improve efficiency in CS51414EDR8?
The BIAS pin in CS51414EDR8 allows internal circuitry to be powered from a 3.3–6.0 V external supply instead of the main VIN rail, reducing power dissipation in the internal LDO. At VIN = 36 V, this cuts quiescent loss by >60%, directly improving light-load efficiency - as validated by efficiency curves in Figure 10 and thermal analysis in the Applications Information section.
What protection features are integrated into CS51414EDR8?
CS51414EDR8 integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), and coordinated frequency foldback (to 130 kHz) plus current foldback (to ~1.5 A) when VFB falls below 0.29 V. These operate simultaneously during overload or short-circuit, limiting junction temperature rise and preventing damage to the on-chip NPN switch and external components.
Is CS51414EDR8 pin-compatible with any industry-standard regulators?
Yes, CS51414EDR8 is functionally pin-compatible with the LT1376, as explicitly stated in the datasheet: "The CS51412 and CS51414 are functionally pin-compatible with the LT1376." This includes identical SOIC-8 pinout for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and BIAS - enabling drop-in replacement in existing LT1376 layouts with no PCB changes required.
CS51414EDR8 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
CS51414EDR8 FAQ
1.How can I place an order for CS51414EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414EDR8 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 CS51414EDR8 reliable?
The price and inventory of CS51414EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414EDR8 is usually 5 days.
3.What payment methods are accepted for CS51414EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414EDR8?
CS51414EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414EDR8 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 CS51414EDR8?
For technical support, including CS51414EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414EDR8 requirements.
6.How does Aetrix verify that CS51414EDR8 is sourced from the original manufacturer or authorized distributors?
All CS51414EDR8 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 CS51414EDR8 meets industry standards.
7.What is the process for return or replacement of CS51414EDR8?
All CS51414EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51414EDR8, 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 CS51414EDR8 part is unused and in its original packaging.
Return procedure for CS51414EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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