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onsemi CS51413GDR8
- Part No.:
- CS51413GDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413GDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
CS51413GDR8 from onsemi is a 1.5 A, 520 kHz fixed-frequency buck regulator IC with V² control architecture, external synchronization capability, and integrated NPN power switch. It operates from 4.5 V to 40 V input, delivers ultrafast transient response, supports soft-start and thermal shutdown, and is used in industrial power supplies and embedded DC/DC conversion.
For engineers reviewing the CS51413GDR8 datasheet, pinout, applications, or equivalent options, this page provides verified specifications, SOIC-8 package mapping, functional pin definitions, real-world use cases, and validated alternative options for design-in and supply continuity.
Technical Context
The CS51413GDR8 implements V² control-using both output voltage DC level and its AC ripple as dual PWM inputs-to achieve load-transient response independent of error amplifier bandwidth. Its oscillator is factory-trimmed to 520 kHz (±14%) and supports external synchronization via TTL-compatible SYNC pin (575–880 kHz range).
It integrates an on-chip NPN switch with 0.4–1.0 V saturation voltage at 1.5 A, BOOST pin for bootstrapped base drive, and foldback protection: when VFB drops below 0.29 V, switching frequency reduces to 25% and current limit folds to 0.9–2.1 A-reducing short-circuit power dissipation.
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. |
| Output Current | 1.5 A continuous; minimum guaranteed switch current limit of 1.6 A ensures robust load handling. |
| Input Voltage Range | 4.5 V to 40 V; supports wide-input industrial and automotive auxiliary rails without pre-regulation. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction and current foldback during overload or short circuit. |
| Shutdown Quiescent Current | 20 µA typical; enables low-power sleep mode with active-low SHDNB pin. |
| Thermal Shutdown Trip | 175–195 °C; protects against sustained overtemperature with 42 °C hysteresis for stable recovery. |
| Reference Voltage Tolerance | ±2.0% (1.244–1.296 V); ensures tight output regulation accuracy across temperature and line. |
Pinout & Package
CS51413GDR8 is housed in an 8-pin SOIC-8 package (Case 751, D suffix), RoHS-compliant and Pb-free. Pin assignments are functionally identical to LT1375.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; reduces saturation voltage and improves efficiency. |
| 2,3,4 - VIN | Main power input | Supplies IC bias and switch collector; accepts 4.5–40 V; multiple pins reduce trace resistance and thermal stress. |
| 5 - VSW | Switch emitter node | Connects to inductor; swings negative during off-time; requires catch diode clamping and short PCB routing. |
| 6 - SHDNB | Active-low shutdown control | TTL-compatible input; pulls <1.0 V to enter sleep mode (<85 µA quiescent current); internal pull-up. |
| 7 - GND | Power return | Common reference for all internal circuits and switch emitter; must be low-impedance connection. |
| 8 - VFB | Feedback input | Inverting input of error amplifier; regulates output by comparing to 1.27 V reference; triggers foldback if <0.29 V. |
| NC - Pins 9–18 | No connection | Not bonded; no internal connection; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers load-transient response independent of error amplifier bandwidth-enabling fast recovery without complex compensation. |
| Synchronization input (SYNC) | Accepts external 575–880 kHz clock to align switching with system timing or reduce EMI through frequency coordination. |
| Soft-start via VC pin | Uses internal error amplifier source current to charge external VC capacitor-eliminates dedicated soft-start pin and external circuitry. |
| Frequency and current foldback | Reduces switching frequency to 25% and limits peak current to ~1.5 A under short-circuit-cutting power dissipation and protecting external components. |
| Thermal shutdown with hysteresis | Trips at 175–195 °C and holds off until junction cools by ≥42 °C-prevents thermal cycling and ensures safe restart after fault clearance. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 12 V or 24 V vehicle battery rail to stable 3.3 V or 5 V for microcontrollers and sensors in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck controller providing regulated low-voltage rail with sync capability to avoid AM-band interference. Use Value: 520 kHz operation allows small 2.2 µH inductors and 10 µF MLCC output capacitors; foldback protection sustains reliability during load dump or shorted sensor lines. |
Use Scenario: Generating 5 V from 9–16 V input in programmable logic controllers (PLCs) operating in harsh factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator delivering 1.5 A with thermal shutdown and wide VIN range for unregulated industrial inputs. Use Value: 40 V max input withstands load-dump transients; ±2% reference tolerance maintains ADC accuracy; SOIC-8 package supports automated assembly and rework. |
| Embedded Communication Gateway | Point-of-Sale Terminal Power |
Use Scenario: Powering Ethernet PHY, CAN transceiver, and ARM Cortex-M host in edge gateway devices requiring low-noise, tightly regulated 3.3 V. IC Role / Device Role / Timing Role: Synchronized buck regulator sharing clock with other converters to minimize beat frequencies and conducted EMI. Use Value: SYNC pin enables deterministic switching alignment; V² control ensures <10 µs recovery from 50% load steps-critical for real-time packet processing. |
Use Scenario: Providing clean 5 V rail for touch display, barcode scanner, and secure element in retail terminals powered from universal AC adapters (12–19 V DC output). IC Role / Device Role / Timing Role: High-efficiency buck converter with BOOST pin optimization to maintain >85% efficiency at light loads (10 mA). Use Value: External boost strapping minimizes switch VCE(sat); 6.25 mA quiescent current extends battery backup runtime during standby. |
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, 250 kHz fixed frequency, no SYNC pin, higher quiescent current (6 mA vs. 6.25 mA), same SOIC-8 package. | Lacks synchronization and foldback protection; suitable only where EMI coordination or short-circuit resilience is not required. | Select only if legacy LT1375 footprint reuse is mandatory and 520 kHz operation or sync capability is unnecessary. |
| MP2315GJ-Z | 3 A rated, 500 kHz, integrated MOSFETs, no BOOST/SYNC pins, 3 mm × 3 mm QFN-8 package, lower IQ (25 µA shutdown). | Higher current, smaller footprint, but lacks external sync and bootstrap drive-limits efficiency at high VIN/light load. | Prefer for space-constrained designs needing >1.5 A; avoid where BOOST-driven NPN efficiency or system-level clock alignment is critical. |
Compared with LT1375CS8#PBF, CS51413GDR8 adds synchronization and foldback protection at identical pinout; compared with MP2315GJ-Z, it trades current rating and size for superior high-VIN efficiency and deterministic timing control-making it optimal for industrial systems demanding reliability and EMI management.
Availability
CS51413GDR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and embedded communication gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CS51413GDR8 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, with leadership in power management, analog, and intelligent sensing technologies.
The CS5141X product line was designed specifically for high-reliability, wide-input DC/DC conversion in industrial and automotive applications-emphasizing robust protection, simplified loop compensation, and noise-aware timing control.
FAQ
What is the maximum input voltage rating for CS51413GDR8?
The CS51413GDR8 has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation above this voltage risks permanent damage. The device is specified for continuous operation from 4.5 V to 40 V, making it suitable for 24 V industrial rails and 12 V automotive systems with load-dump tolerance. Always observe derating guidelines in thermal design when operating near the upper limit.
Does CS51413GDR8 support external synchronization, and what is its valid sync frequency range?
Yes, CS51413GDR8 supports external synchronization via its SYNC pin. The valid sync frequency range is 575 kHz to 880 kHz-covering ±15% around its native 520 kHz switching frequency. Sync pulses must be TTL-compatible with 10–90% duty cycle; rising edges initiate new switching cycles with ~0.5 µs delay. Frequency foldback is disabled during sync mode.
How does the BOOST pin improve efficiency in CS51413GDR8?
The BOOST pin in CS51413GDR8 supplies elevated base drive to the internal NPN power switch, reducing saturation voltage (VCE(sat)) from up to 1.0 V to as low as 0.4 V at 1.5 A. This directly lowers conduction loss-especially beneficial at high input voltages and light loads. A standard 0.1 µF capacitor and 1N4148 diode form the bootstrap network, raising BOOST to ~VIN + VOUT.
What protection features are built into CS51413GDR8?
CS51413GDR8 integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A threshold), and frequency/current foldback (triggered when VFB < 0.29 V). It also includes soft-start via the VC pin and under-voltage lockout (startup at 2.2–4.4 V). These features collectively protect the IC and external components during overloads, shorts, overheating, and abnormal startup conditions.
Is CS51413GDR8 pin-compatible with any industry-standard alternatives?
Yes, CS51413GDR8 is functionally pin-compatible with Linear Technology's LT1375 in SOIC-8 package. Both share identical pinout (BOOST, VIN×3, VSW, SHDNB, GND, VFB), enabling drop-in replacement in existing LT1375 designs-provided the 520 kHz frequency and SYNC functionality meet system requirements. No PCB changes are needed for mechanical or electrical interface compatibility.
CS51413GDR8 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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51413GDR8 FAQ
1.How can I place an order for CS51413GDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413GDR8 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 CS51413GDR8 reliable?
The price and inventory of CS51413GDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413GDR8 is usually 5 days.
3.What payment methods are accepted for CS51413GDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413GDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413GDR8?
CS51413GDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413GDR8 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 CS51413GDR8?
For technical support, including CS51413GDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413GDR8 requirements.
6.How does Aetrix verify that CS51413GDR8 is sourced from the original manufacturer or authorized distributors?
All CS51413GDR8 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 CS51413GDR8 meets industry standards.
7.What is the process for return or replacement of CS51413GDR8?
All CS51413GDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51413GDR8, 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 CS51413GDR8 part is unused and in its original packaging.
Return procedure for CS51413GDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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