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onsemi CS51413GDR8G
- Part No.:
- CS51413GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413GDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,914
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Product details
Overview
CS51413GDR8G 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 power supplies.
For engineers reviewing the CS51413GDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 520 kHz switching frequency, SYNC input compatibility, thermal shutdown (175–195 °C trip), foldback current limiting (0.9–2.1 A), and SOIC-8 package with verified pin mapping for VIN, VSW, GND, VFB, VC, BOOST, SHDNB, and SYNC.
Technical Context
The CS51413GDR8G implements V² control architecture-using the output feedback signal as both DC reference and AC ramp input to the PWM comparator-enabling load-transient response independent of error amplifier bandwidth. Its internal transconductance error amplifier (6.4 mA/V) drives the VC pin with 1.270 V reference and 500 kHz unity-gain bandwidth.
This device operates at 520 kHz nominal frequency (446–594 kHz min/max), reduces switching frequency to 130 kHz under short-circuit conditions via VFB-triggered foldback, and accepts TTL-compatible sync pulses (575–880 kHz range) on the SYNC pin to coordinate multiple regulators or minimize EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal; 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 0.4–1.0 V saturation voltage at 1.5 A |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction and current limit foldback during overload/short circuit |
| SYNC Input Range | 575–880 kHz; allows precise external clock synchronization for noise-sensitive multi-rail systems |
| Thermal Shutdown Trip | 175–195 °C; provides robust overtemperature protection with 42 °C hysteresis |
| Shutdown Quiescent Current | 20 µA typical; reduces system standby power when SHDNB is pulled low |
Pinout & Package
CS51413GDR8G is housed in an SOIC-8 (Case 751) package with gull-wing leads, Pb-free (RoHS-compliant), and rated for 0 °C to 70 °C ambient operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive supply | Provides elevated base drive to on-chip NPN switch; reduces saturation voltage and improves efficiency |
| 2,3,4 (VIN) | Main power input | Supplies internal circuitry and collector of integrated NPN switch; accepts 4.5–40 V |
| 5,6,7 (VSW) | Switch emitter node | Connects to inductor; swings negative during flyback; requires catch diode clamping |
| 8 (SHDNB) | Active-low shutdown | TTL-compatible input; pulls low to enter sleep mode (<85 µA quiescent current) |
| 10 (SYNC) | External synchronization input | Accepts rising-edge sync pulses (575–880 kHz); disables foldback during sync mode |
| 13 (GND) | Power ground return | Common reference for internal circuits and power switch emitter path |
| 16 (VFB) | Feedback input | Inverting input to error amplifier; sets output voltage via resistor divider; triggers protection below 0.29 V |
| 17 (VC) | Error amplifier output | Drives PWM comparator; compensation capacitor (e.g., 0.1 µF) connected here enables soft-start |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers ultrafast load transient response without requiring high-bandwidth error amplifier compensation |
| SYNC input capability | Enables deterministic phase alignment across multiple CS51413GDR8G regulators to suppress beat frequencies |
| Foldback current & frequency limiting | Reduces peak current to ~1.5 A and switches to 130 kHz during short circuit, cutting power dissipation by >75% |
| Soft-start via VC pin | Uses internal error amplifier source current to charge external capacitor-no dedicated SS pin required |
| Thermal shutdown with hysteresis | Shuts down at 175–195 °C and remains off until junction cools by ≥42 °C, preventing thermal cycling |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Converting 24 V battery rail to stable 5 V or 3.3 V for microcontroller, CAN transceiver, and sensor interfaces in under-hood ECUs. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated low-voltage supply with SYNC input synchronized to vehicle clock domain. Use Value: 520 kHz operation minimizes inductor size; foldback protection withstands load dump transients; SOIC-8 aids manual rework in low-volume production. |
Use Scenario: Generating 3.3 V from 12 V automotive supply for infotainment SoC core logic and memory I/O rails. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with BOOST pin enabling >90% efficiency at light loads. Use Value: V² control ensures <10 µs recovery from 1 A load steps; thermal shutdown prevents failure during prolonged high-ambient operation. |
| Factory Automation Sensors | Network Equipment Line Cards |
Use Scenario: Powering isolated RS-485 transceivers and analog front-ends in distributed I/O modules operating from 36 V industrial bus. IC Role / Device Role / Timing Role: Input-tolerant buck converter delivering clean 5 V with minimal external components and no external clock. Use Value: 40 V max VIN eliminates need for pre-regulator; SYNC pin allows coordination with Ethernet PHY timing to reduce conducted EMI. |
Use Scenario: Local 12 V-to-3.3 V conversion on line cards where multiple regulators must avoid beat frequencies causing signal integrity issues. IC Role / Device Role / Timing Role: Synchronized buck controller locked to system master clock via SYNC pin. Use Value: Deterministic 520 kHz switching (±10%) simplifies EMI filter design; SOIC-8 footprint matches legacy designs for drop-in replacement. |
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 uses voltage-mode control; 1.25 V reference; no SYNC input; 250 kHz fixed frequency | Lacks foldback protection and V² transient performance; suitable only for non-critical, low-dynamic-load applications | Choose only if legacy LT1375 footprint reuse is mandatory and SYNC/foldback are not required. |
| MP2315GJ-Z | Monolithic 2 A buck; 500 kHz; no SYNC; integrated MOSFETs; 4.5–26 V input; smaller QFN-8 package | Higher current rating but narrower input range; lacks external sync and V² architecture; no BOOST pin | Select when board space is constrained and 26 V max input suffices; avoid where 40 V input or EMI synchronization is needed. |
Compared with LT1375CS8#PBF and MP2315GJ-Z, CS51413GDR8G uniquely combines 40 V input tolerance, 520 kHz SYNC capability, and V² control for superior transient immunity-making it optimal for industrial and automotive systems demanding robustness and deterministic timing.
Availability
CS51413GDR8G is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, and factory automation sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CS51413GDR8G 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 silicon solutions for automotive, industrial, cloud, and IoT applications, with leadership in power management and analog ICs.
The CS5141X product line was designed specifically for high-reliability, wide-input-voltage DC-DC conversion in harsh environments-emphasizing thermal resilience, transient immunity, and functional safety through integrated protection features.
FAQ
What is the maximum input voltage rating for CS51413GDR8G?
The CS51413GDR8G has an absolute maximum VIN rating of 40 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V risks permanent damage per the Absolute Maximum Ratings table. This 40 V rating enables direct use with 24 V and 36 V industrial bus systems without pre-regulation, distinguishing CS51413GDR8G from lower-voltage alternatives like MP2315GJ-Z (26 V max).
Does CS51413GDR8G support external synchronization, and what is its valid sync frequency range?
Yes, CS51413GDR8G supports external synchronization via its SYNC pin, with a specified input frequency range of 575 kHz to 880 kHz. The SYNC signal must be TTL-compatible, with threshold voltage between 1.0 V and 1.9 V. During sync operation, the internal oscillator is disabled and foldback protection is inactive-ensuring deterministic timing for EMI-sensitive multi-rail systems.
How does the V² control architecture in CS51413GDR8G improve transient response compared to standard voltage-mode controllers?
The V² control architecture in CS51413GDR8G uses the output ripple voltage as the PWM ramp signal-eliminating dependence on error amplifier bandwidth for transient response. Load steps cause immediate duty-cycle correction via the fast feedback path, achieving sub-10 µs recovery. Standard voltage-mode controllers require complex compensation networks and exhibit slower response due to loop-gain limitations.
What protection features are integrated into CS51413GDR8G?
CS51413GDR8G integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (reducing to 130 kHz), and soft-start. Unlike basic regulators, it combines these features with V² control to prevent oscillation during overload and ensure graceful degradation-critical for unattended industrial equipment where fault propagation must be contained.
Can CS51413GDR8G operate without an external boost capacitor on the BOOST pin?
No-CS51413GDR8G requires an external boost capacitor (typically 0.1 µF) connected between BOOST and VSW to maintain sufficient gate drive voltage for the on-chip NPN transistor. Omitting this capacitor causes increased saturation voltage (up to 1.0 V), higher on-chip power dissipation, and potential thermal shutdown under load. The BOOST pin is not optional; it is essential for achieving rated 1.5 A output and >85% efficiency.
CS51413GDR8G 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
CS51413GDR8G FAQ
1.How can I place an order for CS51413GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413GDR8G 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 CS51413GDR8G reliable?
The price and inventory of CS51413GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413GDR8G is usually 5 days.
3.What payment methods are accepted for CS51413GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413GDR8G?
CS51413GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413GDR8G 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 CS51413GDR8G?
For technical support, including CS51413GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413GDR8G requirements.
6.How does Aetrix verify that CS51413GDR8G is sourced from the original manufacturer or authorized distributors?
All CS51413GDR8G 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 CS51413GDR8G meets industry standards.
7.What is the process for return or replacement of CS51413GDR8G?
All CS51413GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51413GDR8G, 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 CS51413GDR8G part is unused and in its original packaging.
Return procedure for CS51413GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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