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onsemi CS51413ED8
- Part No.:
- CS51413ED8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413ED8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
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Product details
Overview
CS51413ED8 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 CS51413ED8 datasheet, pinout, applications, or equivalent options, key selection criteria include its 520 kHz switching frequency, SYNC pin compatibility with external clocks up to 880 kHz, thermal shutdown at 185 °C, 0.29 V frequency foldback threshold, and SOIC-8 package suitability for space-constrained 3.3 V/5 V step-down designs.
Technical Context
The CS51413ED8 implements V² control architecture where both PWM comparator inputs derive from the output voltage - one via fast feedback (AC+DC) and the other via filtered error amplifier output (VC) - enabling load-transient response independent of error amplifier bandwidth. Its internal oscillator operates at 520 kHz (±14%) and folds back to 130 kHz under short-circuit conditions.
It features cycle-by-cycle current limiting with 2.3 A typical current limit, foldback to 1.5 A when VFB < 0.29 V, and uses BOOST pin biasing to maintain NPN saturation at high duty cycles. The device includes soft-start via VC pin capacitor charging and supports external synchronization on the SYNC pin with TTL-compatible 1.5 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal (446–594 kHz range); enables compact magnetics and high power density layout |
| Input Voltage Range | 4.5 V to 40 V; supports wide industrial input rails including 12 V, 24 V, and 36 V systems |
| Output Current | 1.5 A continuous; limited by on-chip NPN transistor with 0.7 V typical saturation voltage at 1.5 A |
| Frequency Foldback Threshold | 0.29 V on VFB pin; triggers 4:1 frequency reduction and current limit foldback during overload |
| SYNC Input Range | 575–880 kHz; allows noise-sensitive multi-rail systems to synchronize switching and reduce beat frequencies |
| Thermal Shutdown Trip | 185 °C (±10 °C); protects against sustained overloads with 42 °C hysteresis for stable recovery |
| Quiescent Current | 6.25 mA typical at no load; drops to 20 µA in shutdown mode via active-low SHDNB pin |
Pinout & Package
CS51413ED8 is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST, Pin 2–4 are VIN, Pin 5 is VSW, Pin 6 is GND, Pin 7 is VFB, and Pin 8 is VC. The CS51413 variant uses SYNC instead of BIAS; SHDNB is not present on this pinout - shutdown is implemented via external logic on SYNC or system-level enable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap drive supply | Provides elevated base drive to on-chip NPN switch; reduces saturation voltage and improves efficiency above 12 V input |
| VIN (Pins 2–4) | Main power input | Supplies primary power to internal circuitry and collector of integrated NPN switch; accepts 4.5–40 V |
| VSW (Pin 5) | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns max); requires catch diode clamping |
| GND (Pin 6) | Power return | Common reference for internal regulators, comparators, and PWM logic; must be low-impedance |
| VFB (Pin 7) | Error amplifier inverting input | Senses output voltage divider; triggers foldback at 0.29 V and disables sync mode below threshold |
| VC (Pin 8) | Error amplifier output | Exposes transconductance amplifier output; used for compensation (0.1 µF to GND typical) |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Enables >10 kHz closed-loop bandwidth and eliminates need for high-gain error amplifier compensation |
| External synchronization (SYNC) | Accepts 575–880 kHz external clock on dedicated pin; eliminates beat frequencies in multi-regulator systems |
| Frequency and current foldback | Reduces switching frequency to 130 kHz and peak current to 1.5 A when VFB < 0.29 V - limits power dissipation during short circuits |
| Soft-start via VC pin | Uses error amplifier's 25 µA source current to charge external 0.1 µF capacitor - achieves ~5 ms ramp without extra pins |
| Thermal shutdown with hysteresis | Trips at 185 °C and resets at 143 °C; prevents thermal cycling and ensures safe recovery after overload |
Applications
| Industrial Motor Drives | Programmable Logic Controllers (PLCs) |
|---|---|
Use Scenario: Powering FPGA I/O banks and microcontroller peripherals from 24 V rail in DIN-rail mounted automation controllers. IC Role / Device Role / Timing Role: Primary 3.3 V/5 V buck regulator with V² control ensuring fast response to burst-mode communication loads. Use Value: 520 kHz operation minimizes inductor size; SYNC pin enables alignment with CAN bus timing to suppress EMI in noisy factory environments. |
Use Scenario: Generating isolated 5 V supply for analog sensor front-ends and digital I/O modules in modular PLC backplanes. IC Role / Device Role / Timing Role: Non-isolated buck stage delivering regulated 5 V from unregulated 12–36 V field power bus. Use Value: 40 V absolute maximum input withstands load-dump transients; BOOST pin maintains <0.7 V saturation across full load range. |
| Test & Measurement Equipment | Building Automation Systems |
Use Scenario: Supplying precision ADC/DAC reference circuitry in portable multimeters and signal analyzers powered by Li-ion packs (8–16 V). IC Role / Device Role / Timing Role: High-PSRR (40 dB) buck regulator feeding low-noise LDOs; VFB pin directly monitors output for tight regulation. Use Value: 2.0% reference tolerance and 0.29 V foldback threshold ensure stable 3.3 V rail even during probe short events. |
Use Scenario: Powering Zigbee/BLE wireless modules and HVAC controller MCUs from 24 V PoE-powered building networks. IC Role / Device Role / Timing Role: Compact 520 kHz buck converter enabling small PCB footprint in space-constrained wall-mounted thermostats. Use Value: SOIC-8 package with thermal pad supports 1.5 A continuous load without heatsink; SHDNB-compatible logic enables remote power cycling. |
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 pin; higher quiescent current (8 mA vs. 6.25 mA) | Lacks synchronization capability and 520 kHz option; less suitable for noise-sensitive multi-rail systems | Select when legacy design reuse is required and 520 kHz or SYNC are unnecessary |
| MP2315GJ-Z | 40 V input, 2 A, 500 kHz; integrates high-side MOSFET; no BOOST or SYNC pins; different compensation scheme | Requires redesign of feedback network and layout; lacks foldback protection and V² architecture benefits | Choose for higher current needs where integrated MOSFET simplifies BOM, accepting trade-offs in transient performance |
Compared with LT1375CS8#PBF, CS51413ED8 adds synchronization and doubles switching frequency for smaller passives; versus MP2315GJ-Z, it retains superior transient response via V² control and robust foldback protection but requires external NPN and bootstrap components.
Availability
CS51413ED8 is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers (PLCs), and test & measurement equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51413ED8 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 focused on energy-efficient innovation, serving automotive, industrial, cloud, and IoT markets with differentiated silicon solutions.
The CS5141X product line was designed specifically for high-transient industrial DC/DC conversion, emphasizing V² control simplicity, wide input range, and robust fault protection - targeting replacement of aging linear and discrete-switcher solutions.
FAQ
What is the maximum input voltage rating for CS51413ED8?
The CS51413ED8 has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation beyond this level risks permanent damage. The device is specified for continuous operation from 4.5 V to 40 V, making it suitable for 24 V industrial buses and automotive-derived 36 V systems. Transient overvoltage tolerance is not guaranteed beyond 40 V without external clamping.
Does CS51413ED8 support external synchronization, and what is its valid frequency range?
Yes, CS51413ED8 supports external synchronization via the SYNC pin, with a valid input frequency range of 575 kHz to 880 kHz. The SYNC pin has a TTL-compatible 1.5 V threshold and accepts duty cycles from 10% to 90%. Frequency foldback is disabled during sync mode, ensuring consistent timing behavior under fault conditions.
How does the BOOST pin function in CS51413ED8, and what is its minimum required voltage?
The BOOST pin in CS51413ED8 supplies base drive to the on-chip NPN transistor, reducing saturation voltage and improving efficiency. It requires a minimum voltage of VIN + 2.5 V during switch conduction, typically achieved using a bootstrap capacitor and diode (e.g., 1N4148). The pin tolerates up to 40 V and draws 6–40 mA depending on load current.
What protection features are built into CS51413ED8?
CS51413ED8 includes thermal shutdown (trip at 185 °C), cycle-by-cycle current limiting (2.3 A typical), frequency foldback (to 130 kHz), current limit foldback (to 1.5 A), soft-start, and undervoltage lockout (startup at 3.3 V typical). These operate autonomously without external components, providing comprehensive fault coverage for industrial environments.
Is CS51413ED8 pin-compatible with any industry-standard alternatives?
Yes, CS51413ED8 is functionally pin-compatible with the LT1375, sharing identical SOIC-8 pinout for BOOST, VIN, VSW, GND, VFB, and VC. However, LT1375 lacks SYNC functionality and operates only at 260 kHz. This allows drop-in replacement in legacy LT1375 designs where upgraded frequency and synchronization are added via minor board modifications.
CS51413ED8 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
CS51413ED8 FAQ
1.How can I place an order for CS51413ED8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413ED8 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 CS51413ED8 reliable?
The price and inventory of CS51413ED8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413ED8 is usually 5 days.
3.What payment methods are accepted for CS51413ED8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413ED8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413ED8?
CS51413ED8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413ED8 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 CS51413ED8?
For technical support, including CS51413ED8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413ED8 requirements.
6.How does Aetrix verify that CS51413ED8 is sourced from the original manufacturer or authorized distributors?
All CS51413ED8 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 CS51413ED8 meets industry standards.
7.What is the process for return or replacement of CS51413ED8?
All CS51413ED8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51413ED8, 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 CS51413ED8 part is unused and in its original packaging.
Return procedure for CS51413ED8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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