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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

onsemi CS51411GD8

Name: CS51411GD8
Brand: onsemi
SKU: CS51411GD8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CS51411GD8

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: CS51411GD8.pdf

Description:: IC REG BUCK ADJ 1.5A 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:4,700

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Product details

Overview

CS51411GD8 from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, external BOOST pin for bootstrapped NPN switch drive, SYNC input for noise-sensitive or parallel operation, and integrated thermal shutdown, cycle-by-cycle current limiting, and frequency foldback. It operates from 4.5 V to 40 V input and delivers tightly regulated output in industrial power supplies and automotive body electronics.

For engineers reviewing the CS51411GD8 datasheet, pinout, applications, or equivalent options, key selection considerations include its 260 kHz switching frequency, SYNC capability (CS51411/CS51413 only), SOIC-8 package compatibility with LT1375, BOOST-driven NPN switch saturation voltage ≤ 0.7 V at 1.5 A, and VFB foldback threshold of 0.32 V for short-circuit protection.

Technical Context

The CS51411GD8 implements V² control-using the converter's output ripple as both DC reference and AC ramp input to the PWM comparator-enabling ultrafast transient response independent of error amplifier bandwidth and simplified loop compensation with only a 0.1 µF VC-to-GND capacitor. Its internal NPN power switch is biased via the BOOST pin to ensure saturation and minimize on-chip dissipation.

It features dual protection modes: when VFB falls below 0.29 V, it triggers frequency foldback (reducing switching frequency to 25% of nominal) and current limit foldback (to ~1.5 A); shutdown is activated by pulling SHDNB low (<1.0 V), reducing quiescent current to 85 µA. The device is specified for −40 °C to 85 °C operation and supports external synchronization up to 470 kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	260 kHz ±13% - enables compact magnetics and EMI filtering; factory-trimmed, no external components required.
Output Current	1.5 A continuous - delivered by on-chip NPN transistor with BOOST-assisted saturation for low conduction loss.
Input Voltage Range	4.5 V to 40 V - supports wide industrial and automotive battery-fed inputs without pre-regulation.
VFB Foldback Threshold	0.32 V (typ) - initiates frequency and current foldback under overload/short-circuit, limiting power dissipation.
Saturation Voltage (V_CE(sat))	0.7 V (max) at I_OUT = 1.5 A, V_BOOST = V_IN + 2.5 V - ensures high efficiency by minimizing switch conduction loss.
Shutdown Quiescent Current	85 µA (max) - enables ultra-low-power standby in battery-backed systems when SHDNB is asserted.
Thermal Shutdown Trip	185 °C (typ) with 42 °C hysteresis - protects against sustained overloads or poor PCB thermal design.

Pinout & Package

CS51411GD8 is housed in an SOIC-8 (Case 751) package with gull-wing leads, Pb-free and RoHS-compliant. Thermal pad is not present; power dissipation relies on PCB copper area connected to Pin 6 (GND).

Pin/Terminal	Circuit Role	Design Meaning
1 - BOOST	Bootstrap drive supply	Provides elevated base drive to internal NPN switch; connects to external diode+capacitor network to maintain V_BOOST ≥ V_IN + 2.5 V for full saturation.
2,3,4 - VIN	Main power input	Supplies current to internal bias rails and collector of NPN switch; accepts 4.5–40 V; multiple pins reduce trace resistance and improve thermal path.
5 - VSW	Switch emitter node	Connects to inductor and catch diode; swings negative to −1.0 V (50 ns max); requires short, low-inductance layout to minimize EMI.
6 - GND	Power return	Primary ground reference for internal circuitry and switch emitter; must be tied to low-impedance PCB ground plane.
7 - VFB	Feedback input	Inverting input of error amplifier; regulates output via resistor divider; <0.29 V triggers foldback protection.
8 - VC	Error amplifier output	Provides compensated error signal to PWM comparator; connect 0.1 µF capacitor to GND for soft-start and stability.
- SHDNB (Pin 8 on CS51412/4; not present on CS51411GD8)	Not applicable	CS51411GD8 does not have SHDNB; shutdown functionality is absent - this variant uses fixed-enable operation.
- SYNC (Pin 5 on CS51411/3; not present on CS51411GD8)	Not applicable	CS51411GD8 does not include SYNC functionality - synchronization capability is omitted in this specific variant per datasheet marking and pin mapping.

Key Features

Feature	Design Value
V² Control Architecture	Delivers sub-10 µs load transient response without requiring high-bandwidth error amplifiers; enables stable regulation with ceramic output capacitors.
BOOST Pin Operation	Reduces NPN saturation voltage by >30% vs. non-bootstrapped drive, cutting switch conduction loss and enabling >90% efficiency at 12 V_IN/5 V_OUT.
Frequency & Current Foldback	Under short-circuit, reduces switching frequency to 65 kHz and peak current to ~1.5 A - limits junction temperature rise to safe levels without external intervention.
Soft-Start via VC Pin	Uses internal error amplifier source current (25 µA typ) charging external 0.1 µF capacitor to achieve ~5 ms controlled output ramp-up, eliminating inrush stress.
Thermal Shutdown with Hysteresis	Trips at 185 °C (typ) and resets at 143 °C - prevents thermal cycling during marginal overload conditions and ensures reliable recovery.

Applications

Industrial 24 V Power Supplies	Automotive Body Control Modules
Use Scenario: Converting 24 V battery rail to 5 V/3.3 V for microcontrollers, CAN transceivers, and sensors in engine bay or chassis modules. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC power with robust fault handling in high-temperature, vibration-prone environments. Use Value: 40 V absolute maximum input withstands load-dump transients; thermal shutdown and foldback protect against sustained shorts during connector mating/unmating.	Use Scenario: Generating 3.3 V for infotainment SoCs and ADAS camera interfaces from 12 V vehicle battery with minimal board space. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC stage where V² control suppresses output voltage deviation during rapid CPU load changes. Use Value: 260 kHz fixed frequency allows predictable EMI filter design; BOOST pin enables >88% efficiency at light loads typical of always-on domains.
Point-of-Load Converters for PLC I/O	Smart Sensor Transmitter Power
Use Scenario: Local 5 V supply for analog input/output modules in programmable logic controllers operating across −40 °C to 70 °C ambient. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete MOSFET+controller solutions in space-constrained DIN-rail enclosures. Use Value: SOIC-8 package fits standard footprint; 2.0% reference tolerance and line regulation <0.15%/V ensure precise sensor excitation and ADC reference stability.	Use Scenario: Powering 4–20 mA loop-powered smart pressure/temperature transmitters with 3.3 V digital core from 9–36 V loop supply. IC Role / Device Role / Timing Role: Efficient step-down regulator delivering regulated voltage while maintaining loop compliance margin under varying load currents. Use Value: Quiescent current <6.25 mA enables operation down to 9 V loop voltage; foldback protection prevents latch-up during sensor cable faults.

Industrial 24 V Power Supplies

Automotive Body Control Modules

Use Scenario: Converting 24 V battery rail to 5 V/3.3 V for microcontrollers, CAN transceivers, and sensors in engine bay or chassis modules.

IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC power with robust fault handling in high-temperature, vibration-prone environments.

Use Value: 40 V absolute maximum input withstands load-dump transients; thermal shutdown and foldback protect against sustained shorts during connector mating/unmating.

Use Scenario: Generating 3.3 V for infotainment SoCs and ADAS camera interfaces from 12 V vehicle battery with minimal board space.

IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC stage where V² control suppresses output voltage deviation during rapid CPU load changes.

Use Value: 260 kHz fixed frequency allows predictable EMI filter design; BOOST pin enables >88% efficiency at light loads typical of always-on domains.

Point-of-Load Converters for PLC I/O

Smart Sensor Transmitter Power

Use Scenario: Local 5 V supply for analog input/output modules in programmable logic controllers operating across −40 °C to 70 °C ambient.

IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete MOSFET+controller solutions in space-constrained DIN-rail enclosures.

Use Value: SOIC-8 package fits standard footprint; 2.0% reference tolerance and line regulation <0.15%/V ensure precise sensor excitation and ADC reference stability.

Use Scenario: Powering 4–20 mA loop-powered smart pressure/temperature transmitters with 3.3 V digital core from 9–36 V loop supply.

IC Role / Device Role / Timing Role: Efficient step-down regulator delivering regulated voltage while maintaining loop compliance margin under varying load currents.

Use Value: Quiescent current <6.25 mA enables operation down to 9 V loop voltage; foldback protection prevents latch-up during sensor cable faults.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1375CS8#PBF	Pin-compatible, 1.5 A, 500 kHz, no BOOST pin, higher IQ (6 mA), no V² control.	Lacks bootstrapped drive → higher V_CE(sat); less efficient at high input voltages; requires more complex compensation.	Select if higher switching frequency is needed and efficiency at 24–40 V input is secondary to cost or legacy design reuse.
MP2307DN-LF-Z	1.5 A, 500 kHz, MOSFET-based, no SYNC/BOOST, 3.3–28 V input, integrated high-side FET.	No external diode required; lower IQ (2.5 mA); lacks foldback protection and V² transient performance.	Prefer for simpler BOM and lower no-load consumption, but verify short-circuit robustness and transient response meet system requirements.

Compared with LT1375CS8#PBF and MP2307DN-LF-Z, CS51411GD8 uniquely combines BOOST-driven NPN saturation, V² control for sub-10 µs transients, and foldback protection - making it optimal for ruggedized 24 V industrial and automotive point-of-load designs where reliability under fault conditions is critical.

Availability

CS51411GD8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, PLC I/O modules, and smart sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CS51411GD8 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-reliability, wide-input-voltage buck conversion in harsh environments - emphasizing fault resilience, thermal robustness, and ease of compensation using V² architecture.

FAQ

What is the function of the BOOST pin on the CS51411GD8?

The BOOST pin on the CS51411GD8 supplies elevated base drive voltage to the internal NPN power switch, ensuring deep saturation and minimizing V_CE(sat). It connects to an external bootstrap network (diode + capacitor) referenced to VSW; when the switch is on, BOOST voltage reaches ~V_IN + V_OUT, reducing conduction loss and improving efficiency - especially critical at high input voltages like 24 V or 36 V. This function is essential to achieving the rated 1.5 A output.

Does the CS51411GD8 support synchronization with an external clock?

No, the CS51411GD8 does not support external synchronization. While the CS51411 family includes SYNC-capable variants (e.g., CS51411E/CS51411G), the GD8 suffix denotes the SOIC-8 package variant without SYNC functionality - confirmed by the absence of SYNC pin assignment in the SOIC-8 pinout diagram and explicit exclusion in the "PACKAGE PIN DESCRIPTION" table. Only CS51411/CS51413 DFN-18 variants include SYNC.

What is the maximum input voltage the CS51411GD8 can handle?

The CS51411GD8 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. This wide range accommodates 24 V industrial systems and 12 V automotive applications with load-dump immunity. Exceeding 40 V risks permanent damage, and operation below 4.5 V may prevent startup due to the 3.3 V typical startup threshold.

How does the CS51411GD8 implement short-circuit protection?

The CS51411GD8 implements short-circuit protection via dual foldback mechanisms triggered when VFB drops below 0.29 V: (1) switching frequency reduces to 25% of nominal (65 kHz), lowering average power; and (2) current limit folds back from 2.3 A (typ) to 1.5 A (typ), reducing stress on the internal NPN switch and external components. These actions are automatic, require no external circuitry, and are fully specified in the Electrical Characteristics table.

Is the CS51411GD8 pin-compatible with any industry-standard regulators?

Yes, the CS51411GD8 is functionally pin-compatible with the Linear Technology LT1375 in SOIC-8 package - confirmed in the datasheet's "Features" section and "PRODUCT SELECTION GUIDE". This allows drop-in replacement in existing LT1375 designs, though designers must verify BOOST pin routing and adjust compensation if migrating from voltage-mode control to V² architecture for optimal transient response.

CS51411GD8 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:: 260kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

CS51411GD8 FAQ

1.How can I place an order for CS51411GD8 through Aetrix?

Please submit a Request for Quotation (RFQ) for CS51411GD8 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 CS51411GD8 reliable?

The price and inventory of CS51411GD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411GD8 is usually 5 days.

3.What payment methods are accepted for CS51411GD8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411GD8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CS51411GD8?

CS51411GD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CS51411GD8 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 CS51411GD8?

For technical support, including CS51411GD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411GD8 requirements.

6.How does Aetrix verify that CS51411GD8 is sourced from the original manufacturer or authorized distributors?

All CS51411GD8 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 CS51411GD8 meets industry standards.

7.What is the process for return or replacement of CS51411GD8?

All CS51411GD8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51411GD8, 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 CS51411GD8 part is unused and in its original packaging.

Return procedure for CS51411GD8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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