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onsemi CS51413GD8G
- Part No.:
- CS51413GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413GD8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
CS51413GD8G 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 fast transient response for point-of-load DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the CS51413GD8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 520 kHz switching frequency, SYNC input compatibility (575–880 kHz range), 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 CS51413GD8G implements V² control architecture, where the PWM comparator receives both DC error signal (via VC) and AC-coupled output ripple (via VFB path), enabling load-transient response independent of error amplifier bandwidth. Its oscillator is factory-trimmed to 520 kHz ±14% and features frequency foldback to 130 kHz under short-circuit conditions.
Synchronization is supported via TTL-compatible SYNC pin (1.0–1.9 V threshold, 575–880 kHz range), disabling foldback during sync mode. The integrated NPN switch exhibits 0.4–1.0 V saturation voltage at 1.5 A, with cycle-by-cycle current limiting (1.6–3.0 A) and thermal shutdown (175–195 °C trip, 42 °C hysteresis).
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-input industrial and automotive battery-derived rails. |
| Output Current | 1.5 A continuous; limited by on-chip NPN transistor with external boost capacitor for saturation. |
| Sync Frequency Range | 575–880 kHz; allows noise-sensitive system-level clock alignment without compromising regulation. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction to 130 kHz and current limit foldback to ~1 A for short-circuit protection. |
| Shutdown Quiescent Current | 20 µA typical; reduces system standby power when SHDNB is pulled low. |
| Thermal Shutdown Trip | 175–195 °C; protects die integrity under sustained overload or poor heatsinking. |
Pinout & Package
CS51413GD8G is housed in an SOIC-8 (Case 751) package with 1.27 mm pitch, Pb-free (G suffix), and rated for 0 °C to 70 °C ambient operation. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive supply | Provides elevated base drive to internal NPN switch; connects to external diode+capacitor network to minimize VCE(sat) and improve efficiency. |
| 2 - VIN | Main power input | Supplies primary power to internal circuitry and collector of NPN switch; accepts 4.5–40 V DC. |
| 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. |
| 4 - GND | Power return | Common reference for internal bias, error amplifier, and current sensing; must be low-impedance connection. |
| 5 - VFB | Feedback input | Inverting input of error amplifier; sets output voltage via resistor divider; triggers foldback below 0.29 V. |
| 6 - VC | Error amplifier output | Provides compensated error signal to PWM comparator; clamped to limit recovery time after overcurrent. |
| 7 - SHDNB | Active-low shutdown | TTL-compatible input; pulls below 1.0 V to enter sleep mode (IQ < 85 µA); internal pull-up enables default-on operation. |
| 8 - SYNC | External clock input | Accepts rising-edge-triggered sync signal (575–880 kHz); overrides internal oscillator and disables foldback. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers ultrafast load transient response independent of error amplifier bandwidth, simplifying compensation to single 0.1 µF capacitor on VC. |
| SYNC input with disableable foldback | Enables deterministic multi-regulator synchronization while preserving full current limit and frequency during normal operation. |
| BOOST pin with bootstrapped drive | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting on-die conduction loss and improving efficiency at high input voltages. |
| Frequency and current foldback | Automatically scales switching frequency to 130 kHz and limits peak current to ~1 A during short circuits, reducing thermal stress on IC and external components. |
| Soft-start via VC pin charging | Uses internal error amplifier source current to ramp VC voltage, achieving >5 ms soft-start without external timing components. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Generating stable 5 V or 3.3 V from 12 V or 24 V vehicle battery with EMI constraints. IC Role / Device Role / Timing Role: Primary buck controller managing point-of-load conversion with SYNC input aligned to CAN bus clock to suppress conducted emissions. Use Value: 520 kHz operation minimizes inductor size; SYNC capability avoids beat frequencies with microcontroller clocks; thermal shutdown ensures reliability in under-hood temperature excursions. |
Use Scenario: Powering microcontrollers, sensors, and CAN transceivers in body electronics modules with variable input (9–16 V). IC Role / Device Role / Timing Role: Fixed-frequency buck regulator delivering regulated 5 V output with shutdown control for low-power sleep modes. Use Value: 20 µA shutdown current extends battery life; 40 V max input withstands load-dump transients; V² control maintains tight regulation during door-lock motor surges. |
| Factory Automation I/O Modules | Point-of-Load Converters in Test Equipment |
|
Use Scenario: Converting 24 V industrial bus to 3.3 V for FPGA configuration and communication interfaces. IC Role / Device Role / Timing Role: High-efficiency buck regulator with BOOST pin driven from auxiliary 5 V rail to reduce thermal load during continuous 1.2 A operation. Use Value: Bootstrapped drive lowers VCE(sat) to 0.4 V, cutting die temperature rise by ~15 °C vs non-boosted operation; SOIC-8 allows standard reflow assembly. |
Use Scenario: Providing clean, low-noise 3.3 V supply for ADC reference and digital logic in benchtop instruments. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system master clock to eliminate switching noise coupling into analog sections. Use Value: SYNC pin accepts 650 kHz external clock, shifting switching spectrum away from sensitive 100 kHz–1 MHz bands; V² control rejects line ripple better than voltage-mode alternatives. |
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, 1.5 A, 250 kHz fixed frequency; no SYNC or V² control; higher quiescent current (6 mA vs 6.25 mA typical). | Lacks frequency foldback and external sync; less suitable for noise-sensitive or short-circuit-prone environments. | Choose LT1375CS8#PBF only if legacy design reuse or cost sensitivity outweighs need for advanced protection and synchronization. |
| MP2451DT-LF-Z | 36 V input, 2 A, 2 MHz switching; current-mode control; no BOOST or SYNC pins; different pinout and compensation requirements. | Higher frequency enables smaller inductors but increases EMI risk; lacks thermal hysteresis and foldback behavior. | Prefer MP2451DT-LF-Z for space-constrained designs needing >1.5 A, but verify loop stability and thermal margin without V²'s inherent transient robustness. |
Compared with LT1375CS8#PBF and MP2451DT-LF-Z, CS51413GD8G uniquely combines pin-compatible upgrade path from LT1375, V² control for superior transient immunity, and SYNC-enabled noise management-making it optimal for industrial and automotive systems requiring predictable fault behavior and EMI control.
Availability
CS51413GD8G is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, factory automation I/O modules, and point-of-load converters in test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for CS51413GD8G 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 sensor technologies for automotive, industrial, and cloud infrastructure markets.
The CS5141X product line was designed specifically for high-reliability, wide-input-voltage buck conversion in harsh environments-emphasizing robust protection (thermal, current, short-circuit), simplified design (V² control), and system-level integration (SYNC, BOOST, SHDNB).
FAQ
What is the maximum input voltage rating for CS51413GD8G?
The CS51413GD8G supports a maximum input voltage of 40 V on the VIN and BOOST pins, with absolute minimum of −0.3 V. This 4.5 V to 40 V operating range accommodates industrial 24 V systems and automotive battery variations including load-dump transients. Exceeding 40 V risks permanent damage per the Absolute Maximum Ratings table.
Does CS51413GD8G require an external bootstrap capacitor?
Yes, CS51413GD8G requires an external bootstrap capacitor (typically 0.1 µF ceramic) connected between BOOST and VSW pins. This capacitor enables bootstrapped gate drive for the internal NPN transistor, reducing saturation voltage and conduction losses. Omitting it degrades efficiency and may cause thermal overload under full-load conditions.
How does the SYNC function behave during short-circuit conditions on CS51413GD8G?
During short-circuit conditions, CS51413GD8G activates frequency foldback (to ~130 kHz) and current limit foldback (~1 A). However, when SYNC is active, these foldback features are disabled-the device maintains nominal 520 kHz operation and full current limit. Therefore, SYNC should be disabled or gated during known fault conditions to preserve protection integrity.
What is the purpose of the VC pin on CS51413GD8G, and can it be left unconnected?
The VC pin on CS51413GD8G provides access to the error amplifier output and serves as the PWM comparator input. It must be connected to a compensation network (typically 0.1 µF to GND) for loop stability and soft-start functionality. Leaving VC unconnected causes regulation failure, oscillation, or inability to start-never float this pin in functional designs.
Is CS51413GD8G pin-compatible with CS51411GD8G?
Yes, CS51413GD8G is pin-compatible with CS51411GD8G-both use identical SOIC-8 packaging and share identical pin functions (BOOST, VIN, VSW, GND, VFB, VC, SHDNB, SYNC). The key difference is switching frequency: CS51411GD8G operates at 260 kHz, while CS51413GD8G operates at 520 kHz. No PCB changes are required for frequency upgrade within same thermal and layout constraints.
CS51413GD8G 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
CS51413GD8G FAQ
1.How can I place an order for CS51413GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413GD8G 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 CS51413GD8G reliable?
The price and inventory of CS51413GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413GD8G is usually 5 days.
3.What payment methods are accepted for CS51413GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413GD8G?
CS51413GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413GD8G 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 CS51413GD8G?
For technical support, including CS51413GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413GD8G requirements.
6.How does Aetrix verify that CS51413GD8G is sourced from the original manufacturer or authorized distributors?
All CS51413GD8G 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 CS51413GD8G meets industry standards.
7.What is the process for return or replacement of CS51413GD8G?
All CS51413GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51413GD8G, 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 CS51413GD8G part is unused and in its original packaging.
Return procedure for CS51413GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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