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onsemi CS51411GD8G
- Part No.:
- CS51411GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51411GD8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,418
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Product details
Overview
CS51411GD8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, external BOOST capacitor support, SYNC input, and thermal shutdown protection. It operates from 4.5 V to 40 V input, delivers regulated output via integrated NPN switch, and targets industrial power supplies and embedded DC-DC conversion where fast transient response and simple compensation are required.
For engineers reviewing the CS51411GD8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 260 kHz switching frequency, SYNC capability for noise-sensitive systems, BOOST-driven NPN saturation voltage ≤0.7 V at 1.5 A, 0.29 V VFB foldback threshold, and SOIC-8 package compatibility with LT1375.
Technical Context
The CS51411GD8G implements V² control architecture, using the converter's output ripple as both DC regulation reference and AC control ramp-enabling ultrafast load transient response independent of error amplifier bandwidth. Its internal transconductance error amplifier (6.4 mA/V) drives the VC pin for PWM comparator input, with only a 0.1 µF capacitor needed for stable compensation.
It integrates a high-current NPN power switch (1.5 A min output), cycle-by-cycle current limiting (2.3 A typ), frequency foldback (4:1 reduction under short circuit), and active-low SHDNB with 85 µA shutdown quiescent current. The SYNC pin accepts TTL-compatible external clocks (305–470 kHz) and disables foldback during synchronization.
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. |
| Max Output Current | 1.5 A continuous - delivered by on-chip NPN transistor with BOOST-assisted saturation for low conduction loss. |
| VFB Foldback Threshold | 0.29 V - triggers frequency reduction to 65 kHz and current limit foldback to ~1.5 A under overload/short circuit. |
| Saturation Voltage (VCE(sat)) | 0.7 V max at IOUT = 1.5 A, VBOOST = VIN + 2.5 V - minimizes on-die power dissipation and improves efficiency. |
| Shutdown Quiescent Current | 85 µA max - achieved via active-low SHDNB pin with internal pull-up; supports low-power standby modes. |
| Input Voltage Range | 4.5 V to 40 V - supports wide industrial input rails including 12 V, 24 V, and 36 V systems without pre-regulation. |
| Reference Voltage Tolerance | ±2.0% - ensures tight output regulation accuracy across temperature and line variations. |
Pinout & Package
CS51411GD8G is housed in an SOIC-8 (Case 751) package with standard 1.27 mm pitch, RoHS-compliant Pb-free finish, and rated for 0 °C to 70 °C ambient operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive supply | Provides elevated base drive to NPN switch; connected to external capacitor-diode network to reduce VCE(sat) and improve efficiency. |
| 2,3,4 (VIN) | Main power input | Supplies IC bias and NPN collector; accepts 4.5–40 V; multiple pins reduce trace resistance and thermal stress. |
| 5 (VSW) | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns); requires catch diode and short PCB routing to minimize EMI. |
| 6 (SHDNB) | Active-low enable control | TTL-compatible shutdown input; pulls <1.0 V to enter sleep mode (<85 µA IQ); floats high by internal current source. |
| 7 (GND) | Power return | Primary ground reference for switch, error amp, and oscillator; must be low-impedance connection to minimize noise coupling. |
| 8 (VFB) | Feedback input | Inverting input of error amplifier; compares against 1.27 V internal reference; <0.29 V triggers foldback protection. |
| NC (Pins 9–18) | No connection | Not bonded in SOIC-8 variant; unused in this package configuration. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers ultrafast transient response without requiring high-bandwidth error amplifier; simplifies loop compensation to single 0.1 µF capacitor. |
| SYNC input (CS51411/CS51413) | Enables external clock synchronization (305–470 kHz) for noise-sensitive applications and multi-rail phase alignment. |
| Frequency & current foldback | Reduces switching frequency to 65 kHz and limits peak current to ~1.5 A when VFB < 0.29 V-limiting power dissipation during short circuits. |
| BOOST-driven NPN switch | External bootstrap capacitor raises base drive above VIN, ensuring deep saturation and minimizing on-die power loss at full load. |
| Soft-start via VC pin | Uses error amplifier output current to charge compensation capacitor; achieves controlled startup without dedicated soft-start pin or external circuitry. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V battery rail to 3.3 V or 5 V for microcontrollers and sensors in harsh environments. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC output with thermal shutdown and short-circuit foldback. Use Value: 260 kHz switching allows small inductors/capacitors; BOOST pin maintains efficiency across wide input range; SOIC-8 eases manual rework and thermal management. |
Use Scenario: Powering CAN transceiver, EEPROM, and wake-up logic in door modules or lighting controllers. IC Role / Device Role / Timing Role: Point-of-load regulator with SYNC capability to align switching edges with system clock and reduce conducted EMI. Use Value: 85 µA shutdown current extends battery life in sleep mode; V² control ensures stable output during load dumps and cold-crank transients. |
| Programmable Logic Controller (PLC) I/O Card | Medical Diagnostic Sensor Interface |
Use Scenario: Generating isolated 5 V or 12 V rails for analog front-ends and digital isolators on modular I/O cards. IC Role / Device Role / Timing Role: Fixed-frequency buck controller with cycle-by-cycle current limiting to protect against field-wiring faults. Use Value: 40 V absolute max input withstands surge events per IEC 61000-4-5; GND-referenced VFB simplifies feedback divider design and improves noise immunity. |
Use Scenario: Powering low-noise op-amps, ADCs, and precision references in portable ultrasound or ECG front-ends. IC Role / Device Role / Timing Role: Low-ripple, tightly regulated supply with minimal switching artifacts due to V² architecture and SYNC option. Use Value: 2.0% reference tolerance ensures accurate sensor biasing; soft-start prevents inrush-induced signal corruption during power-up sequences. |
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 SYNC, higher quiescent current (6 mA vs. 6.25 mA typical), no V² control. | Lacks frequency foldback and V² transient response; requires more complex compensation. | Choose when legacy footprint reuse is critical and SYNC/V² features are not required. |
| MP2307DN-LF-Z | 1.2 A, 340 kHz, integrated MOSFET, no BOOST/SYNC, different pinout, lower max input (23 V). | Not pin-compatible; lacks external sync and bootstrap drive; limited to lower-voltage systems. | Consider for cost-sensitive, space-constrained designs below 23 V input where 1.2 A suffices. |
Compared with LT1375CS8#PBF, CS51411GD8G offers superior transient response and built-in protection, while MP2307DN-LF-Z trades integration for reduced BOM count-but neither matches CS51411GD8G's combination of 40 V input, SYNC, BOOST, and V² control in SOIC-8.
Availability
CS51411GD8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) I/O cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51411GD8G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS51411GD8G belongs to onsemi's high-performance analog power management portfolio, designed specifically for rugged, wide-input DC-DC conversion in industrial and transportation systems where reliability, thermal robustness, and fast transient immunity are essential.
FAQ
What is the maximum input voltage rating for CS51411GD8G?
The CS51411GD8G has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation beyond this voltage risks permanent damage. The device is specified to operate continuously from 4.5 V to 40 V, making it suitable for 24 V industrial buses and 36 V automotive systems with appropriate derating and transient protection.
Does CS51411GD8G require an external bootstrap capacitor?
Yes, CS51411GD8G requires an external bootstrap capacitor connected between the BOOST and VSW pins, typically a 0.1 µF ceramic capacitor with a 1N4148 or similar diode. This network elevates the base drive voltage above VIN to ensure deep saturation of the internal NPN switch, reducing VCE(sat) and improving efficiency-especially at high input voltages.
Is CS51411GD8G pin-compatible with LT1375?
Yes, CS51411GD8G is functionally pin-compatible with the LT1375 in SOIC-8 packages. Pin assignments for BOOST, VIN, VSW, SHDNB, GND, VFB, and VC match directly. However, CS51411GD8G adds SYNC functionality on Pin 5 (unconnected on LT1375), so board layout must accommodate this difference if synchronization is used.
What happens to CS51411GD8G during a short-circuit condition?
When the VFB pin voltage drops below 0.29 V, CS51411GD8G initiates protection: switching frequency folds back to 65 kHz (25% of nominal), peak current limit reduces to ~1.5 A, and duty cycle is constrained. This limits power dissipation in the IC and external components, preventing thermal runaway while maintaining safe operating conditions until fault clearance.
Can CS51411GD8G be synchronized to an external clock?
Yes, CS51411GD8G supports external synchronization via its SYNC pin (Pin 5). It accepts TTL-compatible rising-edge clock signals in the 305–470 kHz range. During sync mode, the internal oscillator is disabled, foldback features are suspended, and switching cycles are locked to the external clock-reducing EMI and enabling multi-phase coordination.
CS51411GD8G 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
CS51411GD8G FAQ
1.How can I place an order for CS51411GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411GD8G 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 CS51411GD8G reliable?
The price and inventory of CS51411GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411GD8G is usually 5 days.
3.What payment methods are accepted for CS51411GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411GD8G?
CS51411GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411GD8G 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 CS51411GD8G?
For technical support, including CS51411GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411GD8G requirements.
6.How does Aetrix verify that CS51411GD8G is sourced from the original manufacturer or authorized distributors?
All CS51411GD8G 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 CS51411GD8G meets industry standards.
7.What is the process for return or replacement of CS51411GD8G?
All CS51411GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51411GD8G, 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 CS51411GD8G part is unused and in its original packaging.
Return procedure for CS51411GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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