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onsemi CS51413ED8G
- Part No.:
- CS51413ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413ED8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,647
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Product details
Overview
CS51413ED8G 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-strapped operation via BOOST pin, and delivers ultrafast transient response for point-of-load DC/DC conversion in industrial and embedded power supplies.
For engineers reviewing the CS51413ED8G datasheet, pinout, applications, or equivalent options, key selection considerations include its 520 kHz switching frequency, SYNC pin compatibility with external clocks (575–880 kHz), thermal shutdown at 175–195 °C, 0.29 V frequency foldback threshold, and SOIC-8 package with verified pin mapping for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and SYNC.
Technical Context
The CS51413ED8G implements V² control architecture, where both PWM comparator inputs derive from the output voltage - one via fast feedback path (AC+DC) and the other via filtered error amplifier output (VC) - enabling load-transient response independent of error amplifier bandwidth. Its oscillator is factory-trimmed to 520 kHz (±14%) and reduces to 130 kHz under short-circuit conditions via frequency foldback.
It features cycle-by-cycle current limiting (1.6–3.0 A), soft-start via VC pin capacitor charging, and active-low TTL-compatible SHDNB pin with internal pull-up. The SYNC pin accepts external clock signals (575–880 kHz) to synchronize multiple regulators or minimize EMI, disabling frequency foldback during sync mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal (446–594 kHz); enables compact magnetics and high power density designs. |
| Output Current | 1.5 A continuous; supported by on-chip NPN transistor with saturation voltage ≤1.0 V at 1.5 A. |
| Input Voltage Range | 4.5 V to 40 V; accommodates wide industrial input rails including 12 V, 24 V, and 36 V systems. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction to 25% and current limit foldback to ~1.5 A for short-circuit protection. |
| SYNC Frequency Range | 575–880 kHz; allows precise timing alignment across multiple converters without phase jitter accumulation. |
| Thermal Shutdown Trip | 175–195 °C; provides robust overtemperature protection with 42 °C hysteresis for reliable recovery. |
| Quiescent Current | 6.25 mA typical (no load); optimized for efficiency in always-on industrial monitoring applications. |
Pinout & Package
CS51413ED8G is housed in an SOIC-8 (Case 751, D suffix) package with 1.27 mm pitch, rated for −40 °C to 85 °C operating temperature. Pin 1 is marked with a dot or bevelled corner; pins are numbered counterclockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive supply | Provides elevated base drive to NPN switch; connects to external diode/capacitor network to reduce saturation voltage and improve efficiency. |
| 2: VIN | Main power input | Supplies internal circuitry and collector of on-chip NPN switch; accepts 4.5–40 V with −0.3 V absolute minimum rating. |
| 3: VSW | Switch emitter node | Connects to inductor and catch diode; swings negative to −1.0 V (t < 50 ns) during flyback; requires short PCB traces for EMI control. |
| 4: GND | Power return | Common reference for all internal circuits; must be low-impedance connection to minimize noise coupling into VFB and VC. |
| 5: VFB | Feedback input | Inverting input of error amplifier; regulates output by comparing against 1.270 V internal reference; triggers foldback below 0.29 V. |
| 6: VC | Error amplifier output | Provides PWM comparator input; clamped to limit overshoot during fault recovery; compensation uses single 0.1 µF capacitor to GND. |
| 7: SHDNB | Active-low shutdown | TTL-compatible input; pulls below 1.0 V to enter sleep mode (≤85 µA quiescent); floats high by internal pull-up for default enable. |
| 8: SYNC | External clock input | Accepts rising-edge-triggered sync pulses (10–90% duty); disables foldback and forces synchronous operation up to 880 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers ultrafast transient response independent of error amplifier bandwidth; eliminates need for complex loop compensation. |
| 520 kHz fixed switching frequency | Reduces size of inductors and output capacitors; tight ±14% tolerance simplifies magnetic component selection. |
| External synchronization (SYNC) | Enables noise-sensitive multi-rail systems to avoid beat frequencies; supports parallel operation with precise phase alignment. |
| Frequency and current foldback | Reduces power dissipation by 75% during short-circuit events via 4:1 frequency drop and 40% current limit reduction. |
| Soft-start via VC pin | Uses internal error amplifier source current to ramp output voltage gradually; prevents inrush stress without extra components. |
| Thermal shutdown with hysteresis | Trips at 175–195 °C and holds off until junction cools by ≥42 °C, preventing thermal cycling in sustained overload conditions. |
Applications
| Industrial Motor Control Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Provides regulated 3.3 V or 5 V rail for microcontrollers, CAN transceivers, and sensor interfaces in motor drive enclosures with 12–24 V battery input and high ambient temperature. IC Role / Device Role / Timing Role: Primary buck controller delivering stable low-voltage power; operates at 520 kHz to minimize EMI near sensitive analog signal paths. Use Value: V² control ensures <50 µs recovery from 1 A load steps, maintaining MCU core voltage stability during PWM gate driver switching bursts. |
Use Scenario: Powers infotainment subsystems and lighting controllers from vehicle battery (9–16 V), requiring high reliability and EMI immunity in shared chassis ground environments. IC Role / Device Role / Timing Role: Synchronized buck regulator coordinated with other power rails via SYNC pin to eliminate heterodyne noise in audio amplifiers. Use Value: 520 kHz operation and external sync allow spread-spectrum-like noise suppression without added complexity or cost. |
| Programmable Logic Controller (PLC) I/O Module | Industrial IoT Edge Gateway |
|
Use Scenario: Supplies isolated 5 V logic rail for digital I/O expansion cards operating in harsh 0–70 °C environments with wide input variation (18–36 V). IC Role / Device Role / Timing Role: Fixed-frequency buck converter with thermal shutdown and foldback protection for unattended field deployment. Use Value: 40 V max input rating and 175–195 °C thermal trip ensure safe operation during 36 V surge transients common in industrial 24 V systems. |
Use Scenario: Powers ARM-based SoC and wireless modules (Wi-Fi/BLE) in compact edge nodes powered from PoE or 12 V wall adapters. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator using BOOST pin bootstrapping to maintain >88% efficiency at light loads (10–100 mA). Use Value: 6.25 mA quiescent current and SHDNB-controlled sleep mode extend battery life in intermittently active sensor aggregation nodes. |
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 1.25 A rated; 250 kHz switching; no SYNC pin; higher quiescent current (8 mA). | Lacks synchronization and foldback protection; suitable only for non-critical, single-rail, lower-current applications. | Choose only if legacy LT1375 footprint reuse is mandatory and 520 kHz/sync functionality is unnecessary. |
| MP2307DS-LF-Z | 3 A rated, 500 kHz, integrated MOSFET; no BOOST/SYNC pins; different pinout and compensation scheme. | Requires PCB redesign; lacks V² control and foldback; better suited for cost-sensitive consumer-grade designs. | Select when higher output current and integration outweigh need for ultrafast transient response and robust fault handling. |
Compared with LT1375CS8#PBF and MP2307DS-LF-Z, CS51413ED8G uniquely combines 520 kHz operation, external synchronization, V² control for sub-50 µs load step recovery, and dual-foldback protection - making it optimal for industrial and automotive power rails demanding reliability, timing precision, and dynamic performance.
Availability
CS51413ED8G is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, PLC I/O systems, and industrial IoT edge gateways requiring stable component supply with long-term lifecycle support.
Supply support for CS51413ED8G 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 leader focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications with emphasis on reliability and sustainability.
The CS5141X product line was designed specifically for high-performance, wide-input-voltage buck regulation in space-constrained industrial and automotive systems - prioritizing transient response, thermal resilience, and system-level EMI control.
FAQ
What is the maximum input voltage rating for CS51413ED8G?
The CS51413ED8G 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 for continuous operation from 4.5 V to 40 V, making it suitable for 24 V and 36 V industrial bus applications. Transient spikes beyond 40 V require external clamping protection.
Does CS51413ED8G support external synchronization, and what is its valid frequency range?
Yes, CS51413ED8G supports external synchronization via its dedicated SYNC pin. The valid input frequency range is 575 kHz to 880 kHz, with TTL-compatible logic thresholds (1.0–1.9 V). During sync mode, the internal oscillator is disabled and frequency foldback is suppressed - ensuring deterministic timing in multi-rail systems.
How does the V² control architecture in CS51413ED8G improve transient response compared to standard voltage-mode controllers?
The V² control architecture in CS51413ED8G uses the output voltage ripple itself as the PWM ramp signal, enabling instantaneous duty-cycle adjustment to load transients without relying on error amplifier bandwidth. This results in typical load-step recovery times under 50 µs - significantly faster than conventional voltage-mode controllers that depend on slow compensation networks.
What protection features are built into CS51413ED8G, and how do they activate?
CS51413ED8G includes thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), and frequency/current foldback triggered when VFB falls below 0.29 V. Foldback reduces switching frequency to 130 kHz and limits peak current to ~1.5 A, minimizing power dissipation during short-circuit events while preserving component integrity.
Can CS51413ED8G be used with ceramic output capacitors, and what compensation is required?
Yes, CS51413ED8G is fully compatible with low-ESR ceramic output capacitors. Its V² architecture eliminates reliance on capacitor ESR for loop stability. Compensation requires only a single 0.1 µF capacitor from VC to GND - no additional resistors or complex networks - simplifying design and improving reliability across temperature and aging.
CS51413ED8G 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
CS51413ED8G FAQ
1.How can I place an order for CS51413ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413ED8G 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 CS51413ED8G reliable?
The price and inventory of CS51413ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413ED8G is usually 5 days.
3.What payment methods are accepted for CS51413ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413ED8G?
CS51413ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413ED8G 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 CS51413ED8G?
For technical support, including CS51413ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413ED8G requirements.
6.How does Aetrix verify that CS51413ED8G is sourced from the original manufacturer or authorized distributors?
All CS51413ED8G 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 CS51413ED8G meets industry standards.
7.What is the process for return or replacement of CS51413ED8G?
All CS51413ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51413ED8G, 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 CS51413ED8G part is unused and in its original packaging.
Return procedure for CS51413ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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