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onsemi CS51411GDR8G
- Part No.:
- CS51411GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51411GDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
CS51411GDR8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, external BOOST capacitor support, and SYNC input for noise-sensitive or multi-rail systems. It operates from 4.5 V to 40 V input, delivers regulated output via internal NPN switch, and is used in industrial power supplies, automotive body electronics, and embedded DC/DC conversion where fast transient response and thermal robustness are required.
For engineers reviewing the CS51411GDR8G datasheet, pinout, applications, or equivalent options, key selection considerations include its 260 kHz switching frequency, SYNC capability (not BIAS), SOIC-8 package, 0 °C to 70 °C temperature grade, and functional pin-compatibility with LT1375.
Technical Context
The CS51411GDR8G implements V² control architecture-using both DC output voltage and AC ripple as PWM inputs-to achieve ultrafast load transient response independent of error amplifier bandwidth. Its internal NPN power switch is driven via BOOST pin for saturation optimization, and it integrates cycle-by-cycle current limiting, thermal shutdown at 175–195 °C, and frequency foldback below 0.29 V on VFB.
This device supports synchronization to external clocks between 305–470 kHz (rising-edge triggered), disables frequency foldback during sync mode, and uses a transconductance error amplifier with 1.270 V reference and 500 kHz unity-gain bandwidth. The VC pin provides direct access to error amplifier output for compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz ±13% - enables compact magnetics and EMI filtering; stable across line/load/temperature |
| Output Current | 1.5 A continuous - delivered by integrated NPN transistor with BOOST-assisted saturation |
| Input Voltage Range | 4.5 V to 40 V - supports wide industrial and automotive battery-fed rails |
| VFB Foldback Threshold | 0.29 V - triggers 4:1 frequency reduction and current limit foldback under short-circuit |
| Reference Voltage | 1.270 V ±1.1% - sets output regulation accuracy; used with external resistor divider |
| Shutdown Quiescent Current | 20 µA typical - enables ultra-low-power sleep mode when SHDNB < 1.0 V |
| Thermal Shutdown Trip | 175–195 °C - protects die during overload; 42 °C hysteresis prevents chatter |
Pinout & Package
CS51411GDR8G is housed in an SOIC-8 (Case 751) package with standard 1.27 mm pitch, surface-mount footprint, and Pb-free/RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; reduces VCE(sat), improves efficiency, requires external 0.1 µF capacitor |
| 2,3,4 - VIN | Main power input | Supplies high-current path to collector of internal NPN; accepts 4.5–40 V; multiple pins reduce trace resistance |
| 5,6,7 - VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns max); requires catch diode and low-inductance layout |
| 8 - SHDNB | Active-low enable | TTL-compatible shutdown input; internal pull-up; pulls IC into 20 µA sleep mode when < 1.0 V |
| - GND | Power return | Common ground reference for all internal circuitry and power switch emitter |
| - VFB | Feedback input | Inverting input of error amp; compares against 1.270 V reference to regulate output voltage |
| - VC | Error amp output | Provides PWM comparator input; accessible for loop compensation (e.g., 0.1 µF to GND) |
| - SYNC | Sync input | Accepts external clock (305–470 kHz); synchronizes switching to reduce beat frequencies in multi-rail systems |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Delivers sub-µs load transient response without requiring high-bandwidth error amplifier or complex compensation |
| BOOST Pin Operation | Enables saturated NPN switch operation, reducing VCE(sat) to ≤0.7 V at 1.5 A and minimizing on-die power loss |
| Synchronization Capability | Allows precise timing alignment with other converters to suppress beat frequencies and simplify EMI filter design |
| Frequency & Current Foldback | Reduces switching frequency to 65 kHz and peak current to ~1.5 A during overloads, limiting thermal stress and power dissipation |
| Soft-Start via VC Pin | Uses error amplifier's output source current to ramp VC voltage; achieves controlled startup without dedicated SS pin or external circuitry |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 12 V battery-fed 3.3 V/1.5 A rail powering microcontrollers and CAN transceivers in factory automation PLCs. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise 3.3 V output with fast transient recovery during motor actuation events. Use Value: V² control ensures <10 µs output voltage recovery from 1 A step load, preventing MCU brownouts during concurrent I/O switching. | Use Scenario: 24 V truck battery converted to 5 V for lighting control logic and sensor interfaces in headlamp modules. IC Role / Device Role / Timing Role: High-input-voltage buck controller operating in harsh thermal environments with built-in thermal shutdown and foldback protection. Use Value: 40 V absolute max input rating and 195 °C thermal trip allow reliable operation across cold-crank (5.5 V) to load-dump (36 V) conditions. |
| Point-of-Load Converter | Legacy System Retrofit |
Use Scenario: Replacing aging discrete buck designs on legacy industrial boards needing improved efficiency and smaller footprint. IC Role / Device Role / Timing Role: Integrated solution replacing controller + external NPN + bias network; simplifies BOM and layout. Use Value: SOIC-8 footprint and LT1375 pin compatibility enable drop-in replacement without PCB rework. | Use Scenario: Upgrading legacy telecom shelf power with synchronized multi-rail generation to meet new EMI standards. IC Role / Device Role / Timing Role: Synchronized buck regulator aligned to system master clock to eliminate sub-harmonic interference in analog signal chains. Use Value: SYNC input accepts TTL-level 350 kHz clock, enabling deterministic switching edge placement and predictable noise spectrum. |
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, same SOIC-8; 1.5 A, 250 kHz; no SYNC; higher quiescent current (6 mA vs. 6.25 mA) | Lacks synchronization input; no frequency foldback; less suitable for noise-sensitive or multi-converter systems | Choose if SYNC is unnecessary and legacy LT1375 design reuse is prioritized. |
| MP2307DN-LF-Z | SOIC-8, 2 A, 500 kHz; MOSFET-based; no BOOST/SYNC; 4.5–26 V input; different compensation scheme | Higher current, higher frequency, but lacks V² control and thermal foldback; not pin-compatible | Choose for higher efficiency at light loads or where 500 kHz switching enables smaller inductors. |
Compared with LT1375CS8#PBF, CS51411GDR8G adds SYNC and foldback protection; compared with MP2307DN-LF-Z, it offers superior transient response and thermal resilience at the cost of lower max frequency and NPN-based topology.
Availability
CS51411GDR8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and point-of-load converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51411GDR8G 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 CS51411GDR8G belongs to the CS5141X family of V²-controlled buck regulators, designed specifically for high-transient-response, wide-input-voltage DC/DC conversion in space- and thermally-constrained environments.
FAQ
What is the maximum input voltage rating for CS51411GDR8G?
The CS51411GDR8G has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation above this level risks permanent damage. The device is specified to operate continuously from 4.5 V to 40 V, making it suitable for 24 V industrial and 12 V/24 V automotive battery systems including load-dump conditions up to 36 V. Always observe derating guidelines per the datasheet's thermal calculations.
Does CS51411GDR8G support external synchronization, and what is its valid sync frequency range?
Yes, CS51411GDR8G supports external synchronization via its SYNC pin. The valid sync frequency range is 305 kHz to 470 kHz, with TTL-compatible threshold (1.0–1.9 V). The rising edge of the sync signal initiates each switching cycle, and frequency foldback is disabled during sync mode. This allows deterministic timing alignment in multi-rail systems to suppress beat frequencies and simplify EMI compliance.
How does the BOOST pin function in CS51411GDR8G, and what external components are required?
The BOOST pin in CS51411GDR8G supplies elevated base drive to the internal NPN power switch, ensuring deep saturation and minimizing VCE(sat). It requires an external bootstrap network: typically a 0.1 µF ceramic capacitor and a 1N4148 or 1N914 diode connected from VOUT (or another stable low-voltage rail) to BOOST. During switch-on, BOOST voltage rises to ≈ VIN + VOUT − VF, maintaining sufficient base-emitter headroom.
What protection features are integrated into CS51411GDR8G?
CS51411GDR8G integrates thermal shutdown (trip at 175–195 °C with 42 °C hysteresis), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz), current limit foldback (to 0.9–2.1 A), soft-start (via VC pin ramp), and under-voltage lockout (startup at 2.2–4.4 V). These features collectively protect the IC and external components during short circuits, overloads, thermal overload, and abnormal startup conditions.
Is CS51411GDR8G pin-compatible with any industry-standard alternatives?
Yes, CS51411GDR8G is functionally pin-compatible with Linear Technology's LT1375 in SOIC-8 package. Pin mapping for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and SYNC matches LT1375's VIN, SW, GND, FB, COMP, BOOST, SHDN, and SYNC respectively. This enables direct replacement in existing LT1375 layouts without PCB modification, while adding SYNC capability and enhanced protection features not present in the LT1375.
CS51411GDR8G 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:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51411GDR8G FAQ
1.How can I place an order for CS51411GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411GDR8G 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 CS51411GDR8G reliable?
The price and inventory of CS51411GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411GDR8G is usually 5 days.
3.What payment methods are accepted for CS51411GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411GDR8G?
CS51411GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411GDR8G 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 CS51411GDR8G?
For technical support, including CS51411GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411GDR8G requirements.
6.How does Aetrix verify that CS51411GDR8G is sourced from the original manufacturer or authorized distributors?
All CS51411GDR8G 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 CS51411GDR8G meets industry standards.
7.What is the process for return or replacement of CS51411GDR8G?
All CS51411GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51411GDR8G, 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 CS51411GDR8G part is unused and in its original packaging.
Return procedure for CS51411GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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