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onsemi CS51413GD8
- Part No.:
- CS51413GD8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413GD8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,515
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Product details
Overview
CS51413GD8 from onsemi is a 1.5 A, 520 kHz fixed-frequency buck regulator IC with V² control architecture, external synchronization capability, and 4.5 V to 40 V input voltage range. It integrates an on-chip NPN power switch, supports BOOST pin bootstrapping for reduced saturation voltage, and delivers ultrafast transient response in point-of-load DC/DC conversion for industrial power supplies.
For engineers reviewing the CS51413GD8 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed 520 kHz switching frequency and sync-capable operation, thermal shutdown and foldback protection, and real-world design meaning for layout, efficiency optimization, and system-level noise management.
Technical Context
The CS51413GD8 implements V² control architecture, where both PWM comparator inputs derive from the output feedback signal - one path providing fast AC ripple (FFB) and the other delivering filtered DC error (SFB) via the VC pin. This eliminates dependency on error amplifier bandwidth for transient response and enables stable regulation with minimal compensation (e.g., single 0.1 µF capacitor from VC to GND).
It operates at a factory-trimmed 520 kHz nominal switching frequency, supports external synchronization via TTL-compatible SYNC pin (575–880 kHz range), and features frequency foldback (to 130 kHz) and current limit foldback (to ~1.5 A) when VFB falls below 0.29 V - critical for short-circuit protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz (factory-trimmed, ±14% tolerance); enables compact magnetics and high power density layouts |
| Input Voltage Range | 4.5 V to 40 V; supports wide-input industrial and automotive battery-fed systems |
| Output Current | 1.5 A continuous (min. guaranteed); limited by internal NPN switch and thermal design |
| V² Control Architecture | Delivers <10 µs load transient recovery without requiring high-bandwidth error amplifier compensation |
| SYNC Input Range | 575–880 kHz; allows noise-sensitive multi-rail systems to synchronize switching and reduce beat frequencies |
| Foldback Threshold | VFB < 0.29 V triggers 4:1 frequency reduction and current limit foldback to ~1.5 A - protects IC and external components during overload |
| Shutdown Quiescent Current | 20 µA typical; enables low-power standby modes in battery-backed or energy-conscious designs |
Pinout & Package
CS51413GD8 is housed in an SOIC-8 (Case 751) package with gull-wing leads, Pb-free (RoHS-compliant) finish, and thermal pad not exposed - suitable for standard reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; reduces saturation voltage (typ. 0.7 V @ 1.5 A), improving efficiency and thermal margin |
| 2,3,4: VIN | Main power input | Supplies power to internal bias rails and collector of NPN switch; accepts 4.5–40 V with −0.3 V absolute minimum |
| 5,6,7: VSW | Switch emitter node | Connects to inductor; swings negative up to −1.0 V (t < 50 ns); requires catch diode and short PCB traces to minimize EMI |
| 8: SHDNB | Active-low shutdown | TTL-compatible input; pulls <1.0 V to enter sleep mode (<85 µA IQ); internal pull-up allows floating for always-on operation |
| NC (pins 9,11,12,14,15,18) | No connection | Not bonded; must remain unconnected per datasheet - no routing or grounding allowed |
| 10: SYNC | External clock input | Enables synchronized operation across multiple CS51413GD8 regulators; disables foldback during sync mode |
| 13: GND | Power return | Primary ground reference for internal circuits and switch emitter return; requires low-impedance connection to power plane |
| 16: VFB | Feedback input | Inverting input of error amplifier; regulates output via resistor divider; triggers foldback if <0.29 V |
| 17: VC | Error amplifier output | Provides access to transconductance amplifier output; used for compensation (e.g., 0.1 µF to GND); avoid injecting >0.5 mA |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Enables sub-10 µs load transient response with only passive RC compensation - no op-amp or complex network required |
| 520 kHz fixed switching frequency | Reduces size of inductors and input/output capacitors vs. lower-frequency alternatives; tight ±14% tolerance simplifies magnetics selection |
| SYNC pin with 575–880 kHz range | Allows deterministic timing alignment across multiple rails - essential for EMI reduction in dense PCB layouts |
| BOOST pin bootstrapping | Lowers NPN saturation voltage to 0.7 V (typ.) at 1.5 A, cutting conduction loss by ~30% vs. non-bootstrapped operation |
| Integrated foldback protection | Automatically reduces switching frequency to 130 kHz and current limit to ~1.5 A when VFB < 0.29 V - prevents thermal runaway during shorts |
| Soft-start via VC pin | Uses error amplifier's output source current (25 µA typ.) charging external capacitor to ramp output voltage smoothly - no dedicated SS pin needed |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Generating stable 3.3 V or 5 V from 12 V or 24 V vehicle battery with high EMI immunity requirements. IC Role / Device Role / Timing Role: Primary buck controller managing point-of-load conversion; SYNC pin aligns switching with CAN bus clock to avoid spectral interference. Use Value: 520 kHz operation + SYNC capability minimizes conducted emissions in 1–10 MHz band; foldback protection sustains operation during load dump or shorted sensor lines. |
Use Scenario: Powering microcontrollers and I/O drivers in programmable logic controllers operating from 24 V DC industrial supplies. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with V² control ensuring rapid response to sudden actuator activation or communication bursts. Use Value: Ultrafast transient recovery (<10 µs) maintains MCU core voltage within spec during 1 A load steps; BOOST pin lowers thermal stress under continuous 1.5 A loads. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
Use Scenario: Providing clean, low-noise 5 V rail for analog front-end ADCs and precision amplifiers in portable ultrasound units. IC Role / Device Role / Timing Role: Synchronized buck converter operating at 520 kHz to avoid aliasing with sampling clocks; soft-start prevents inrush-induced voltage droop. Use Value: V² control eliminates need for high-gain error amp - reducing noise injection into sensitive analog sections; SYNC pin enables deterministic jitter-free timing. |
Use Scenario: Supplying regulated 3.3 V to FPGA configuration circuitry and interface logic in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: High-efficiency buck regulator with shutdown control enabling power sequencing and low-quiescent standby states. Use Value: 20 µA shutdown current extends battery life in portable instruments; SHDNB pin allows precise firmware-controlled power gating without external MOSFETs. |
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 but 260 kHz only; no SYNC function; higher quiescent current (6 mA vs. 6.25 mA active, 20 µA shutdown) | Lower switching frequency increases inductor/capacitor size; unsuitable for noise-sensitive multi-rail sync schemes | Select only if 260 kHz operation and legacy footprint compatibility are mandatory; verify thermal margin at 1.5 A |
| MP2451DT-LF-Z | 36 V max input, 2 A rating, 340 kHz fixed freq; no V² control or SYNC; uses current-mode control | Lacks ultrafast transient response and synchronization capability; requires full Type II/III compensation network | Prefer when higher output current is needed and V² performance is not critical; confirm loop stability with ceramic output caps |
Compared with LT1375CS8#PBF and MP2451DT-LF-Z, the CS51413GD8 uniquely combines 520 kHz operation, SYNC capability, V² control for near-zero-compensation design, and integrated foldback - making it optimal for space-constrained, noise-sensitive, and fast-transient industrial power rails.
Availability
CS51413GD8 is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, medical diagnostic equipment, test & measurement instrumentation, and embedded computing requiring stable component supply across extended temperature ranges (−40 °C to 85 °C).
Supply support for CS51413GD8 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 CS51413GD8 belongs to the CS5141X family of V²-controlled buck regulators, designed specifically for high-density, high-transient-response DC/DC conversion in industrial and automotive environments where reliability, EMI control, and simplified compensation are critical.
FAQ
What is the switching frequency of the CS51413GD8 and how is it set?
The CS51413GD8 operates at a factory-trimmed nominal switching frequency of 520 kHz with ±14% tolerance. No external components are required to set or adjust frequency - it is internally fixed. The device also supports external synchronization via the SYNC pin over a 575–880 kHz range, which overrides the internal oscillator and disables foldback protection during sync mode. This makes the CS51413GD8 ideal for noise-sensitive multi-regulator systems.
Does the CS51413GD8 support external synchronization, and what are the voltage requirements for the SYNC pin?
Yes, the CS51413GD8 supports external synchronization through its TTL-compatible SYNC pin (pin 10). The SYNC input accepts logic-high signals between 1.0 V and 1.9 V threshold, with bias current under 0.36 µA at 5 V. It operates reliably across a 575–880 kHz external clock range. During sync operation, the internal oscillator is disabled and frequency foldback is suppressed - ensuring deterministic timing alignment without protection interference. This behavior is fully documented in the CS51413GD8 datasheet Section 9.
How does the BOOST pin improve efficiency in the CS51413GD8?
The BOOST pin on the CS51413GD8 supplies elevated base drive voltage to the internal NPN power switch, reducing its saturation voltage to 0.7 V (typical) at 1.5 A output current. This directly lowers conduction losses - especially beneficial at high input voltages and continuous loads. A standard bootstrap circuit (e.g., 0.1 µF capacitor + 1N4148 diode) connected from VSW to BOOST achieves this effect. Without BOOST, saturation voltage rises to ~1.0 V, increasing on-state power dissipation by ~40%. The CS51413GD8 datasheet confirms BOOST operation improves full-load efficiency by 2–3% in typical 12 V → 3.3 V designs.
What protection features does the CS51413GD8 include, and how do they activate?
The CS51413GD8 integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (2.3 A typ.), and automatic frequency/current foldback triggered when VFB drops below 0.29 V - indicating overload or short circuit. Foldback reduces switching frequency to 130 kHz and peak current limit to ~1.5 A, lowering power dissipation and preventing thermal runaway. All protections are fully internal and require no external components. These behaviors are verified in the CS51413GD8 Electrical Characteristics table and Application Information section.
Is the CS51413GD8 pin-compatible with any industry-standard devices?
Yes, the CS51413GD8 is functionally pin-compatible with the Linear Technology LT1375 in SOIC-8 package - including identical pinout for BOOST, VIN, VSW, SHDNB, GND, VFB, VC, and SYNC (mapped to LT1375's SYNC/SHDN pin). This allows drop-in replacement in existing LT1375 designs while upgrading to 520 kHz operation, V² control, and enhanced foldback protection. Pin compatibility is explicitly stated in the CS51413GD8 datasheet Product Selection Guide and Package Pin Description sections.
CS51413GD8 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
CS51413GD8 FAQ
1.How can I place an order for CS51413GD8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413GD8 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 CS51413GD8 reliable?
The price and inventory of CS51413GD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413GD8 is usually 5 days.
3.What payment methods are accepted for CS51413GD8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413GD8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413GD8?
CS51413GD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413GD8 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 CS51413GD8?
For technical support, including CS51413GD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413GD8 requirements.
6.How does Aetrix verify that CS51413GD8 is sourced from the original manufacturer or authorized distributors?
All CS51413GD8 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 CS51413GD8 meets industry standards.
7.What is the process for return or replacement of CS51413GD8?
All CS51413GD8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51413GD8, 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 CS51413GD8 part is unused and in its original packaging.
Return procedure for CS51413GD8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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