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onsemi CS51413EDR8G
- Part No.:
- CS51413EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413EDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
CS51413EDR8G 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 soft-start via VC pin compensation, and delivers stable 3.3 V/5.0 V/12 V DC-DC conversion in industrial power supplies.
For engineers reviewing the CS51413EDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 520 kHz switching frequency, SYNC pin compatibility for noise-sensitive multi-rail systems, thermal shutdown at 175–195 °C, BOOST pin bootstrapping for <0.7 V saturation voltage, and functional pin-compatibility with LT1375.
Technical Context
The CS51413EDR8G implements V² control architecture, where both PWM comparator inputs derive from the output voltage-fast feedback (AC+DC) and slow feedback (error amplifier output)-enabling ultrafast transient response independent of error amplifier bandwidth. Its oscillator is factory-trimmed to 520 kHz ±14% and folds back to 130 kHz under short-circuit conditions.
It features cycle-by-cycle current limiting with foldback (0.9–2.1 A), 0.29–0.36 V VFB threshold triggering frequency and current reduction, and a dedicated SYNC pin accepting TTL-compatible 575–880 kHz external clocks. The BOOST pin drives the NPN base to minimize saturation loss, while SHDNB enables active-low shutdown with <85 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal (446–594 kHz); enables compact magnetics and high power density layout |
| Output Current | 1.5 A continuous; minimum guaranteed switch current capacity per datasheet test conditions |
| Input Voltage Range | 4.5 V to 40 V; supports wide-input industrial, automotive, and telecom power rails |
| VFB Foldback Threshold | 0.29–0.36 V; triggers 4:1 frequency reduction and current limit foldback during overload |
| Saturation Voltage | 0.4–1.0 V at 1.5 A with BOOST bias; directly reduces conduction loss and junction heating |
| Thermal Shutdown | 175–195 °C trip point with 42 °C hysteresis; protects against sustained overloads without external sensing |
| Shutdown Quiescent Current | 20 µA typical; ensures ultra-low standby power in battery-backed or energy-conscious systems |
Pinout & Package
CS51413EDR8G is housed in an SOIC-8 (Case 751) package with 1.27 mm pitch, rated for −40 °C to 85 °C operation and Pb-free/RoHS compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | NPN base drive node | Accepts bootstrapped voltage ≥ VIN + 2.5 V to ensure transistor saturation and minimize on-resistance loss |
| VIN | Main power input | Supplies internal circuitry and collector of integrated NPN switch; supports 4.5–40 V range |
| VSW | Switch emitter node | Connects to inductor; swings negative up to −1.0 V (50 ns max); requires catch diode clamping |
| SYNC | External clock input | TTL-compatible sync input (1.0–1.9 V threshold); disables foldback when active; enables multi-phase or EMI-controlled operation |
| SHDNB | Active-low enable | Pulled low (<1.0 V) to enter sleep mode; internal pull-up allows floating for always-on use |
| GND | Power return | Common reference for all internal circuits and external compensation components |
| VFB | Error amplifier inverting input | Monitors output via resistor divider; 0.29 V threshold initiates protection foldback |
| VC | Error amplifier output | Provides access to compensation node; 0.1 µF capacitor to GND sets soft-start and loop stability |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers load transient response independent of error amplifier bandwidth; eliminates need for complex compensation networks |
| SYNC pin functionality | Enables precise timing alignment across multiple converters to reduce beat frequencies and conducted EMI in multi-rail systems |
| BOOST-driven NPN switch | Reduces saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss by >30% vs non-bootstrapped operation |
| Frequency & current foldback | Simultaneously lowers switching frequency to 130 kHz and peak current limit to ~1.5 A under short-circuit, limiting total dissipation |
| Soft-start via VC pin | Uses internal error amplifier source current to ramp VC voltage; achieves controlled startup without extra pins or components |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 12 V battery input converted to regulated 5.0 V for microcontroller, CAN transceiver, and sensor interface circuitry in harsh-temperature environments. IC Role / Device Role / Timing Role: Primary buck controller providing isolated, ripple-cleaned 5.0 V rail with SYNC pin synchronized to main system clock to suppress EMI coupling into CAN bus. Use Value: 520 kHz operation minimizes inductor size; thermal shutdown (175–195 °C) ensures reliability under hood temperature excursions; BOOST pin maintains <0.7 V VCE(sat) even at 85 °C ambient. | Use Scenario: 24 V truck battery input stepped down to 3.3 V for infotainment SoC core logic, where burst-mode load transients demand sub-10 µs recovery. IC Role / Device Role / Timing Role: High-bandwidth V²-controlled buck regulator delivering fast transient response without external compensation; SHDNB pin enables deep-sleep state during vehicle ignition-off. Use Value: V² architecture achieves <5 µs load-step recovery; shutdown quiescent current of 20 µA prevents battery drain; SOIC-8 package supports automated optical inspection in high-volume automotive assembly. |
| Telecom Remote Radio Unit | Medical Point-of-Care Analyzer |
Use Scenario: 48 V PoE-derived input converted to 12 V for RF power amplifier bias, requiring low-noise, tightly regulated output with minimal board area. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator operating at 520 kHz to shrink LC filter size; SYNC pin locked to system master clock to eliminate heterodyne interference in sensitive RF front-end. Use Value: 4.5–40 V input range accommodates PoE+ voltage drop; foldback protection prevents latch-up during PA fault conditions; 0.29 V VFB threshold ensures immediate response to output shorts. | Use Scenario: Battery-powered handheld analyzer requiring 3.3 V for ADC, display driver, and Bluetooth radio, with strict energy budget and safety-critical thermal behavior. IC Role / Device Role / Timing Role: Main DC-DC converter enabling portable operation; thermal shutdown with 42 °C hysteresis prevents false trips during brief temperature spikes near processor heat sources. Use Value: Soft-start via VC pin eliminates inrush stress on Li-ion battery; 85 µA shutdown current extends runtime; RoHS/Pb-free SOIC-8 meets medical regulatory traceability requirements. |
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; 1.5 A rating, 500 kHz typical frequency; no V² architecture or SYNC pin | Lacks V² transient performance and synchronization; requires full external compensation network | Select only if legacy design reuse or vendor lock-in mandates Linear Technology footprint |
| MP2451DT-LF-Z | 36 V max input, 2 A output, 2 MHz switching; current-mode control; no BOOST or SYNC pins; different pinout | Higher frequency enables smaller passives but lacks foldback protection and thermal hysteresis spec | Prefer for space-constrained designs needing >1.5 A, but verify thermal margin without foldback behavior |
Compared with LT1375CS8#PBF, CS51413EDR8G delivers faster transient response and simpler design via V² control; compared with MP2451DT-LF-Z, it offers superior overload protection and thermal robustness at the cost of lower switching frequency and larger magnetics.
Availability
CS51413EDR8G is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CS51413EDR8G 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, medical, and IoT applications.
The CS5141X product line was designed specifically for high-reliability, wide-input DC-DC conversion in harsh-environment applications-emphasizing thermal resilience, fast transient immunity, and simplified PCB layout through integrated V² control and bootstrapped switching.
FAQ
What is the maximum input voltage rating for CS51413EDR8G?
The CS51413EDR8G has an absolute maximum input voltage rating of 40 V on the VIN pin, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V may damage the internal NPN power switch or bias circuitry. This rating is validated per onsemi's Maximum Ratings table and applies across the full −40 °C to 85 °C temperature range specified for the CS51413E grade.
Does CS51413EDR8G support external synchronization, and what is its valid sync frequency range?
Yes, CS51413EDR8G supports external synchronization via its SYNC pin, which accepts TTL-compatible input signals in the 575 kHz to 880 kHz range. This range is specified in the Electrical Characteristics table and enables precise timing alignment across multiple converters to suppress beat frequencies and reduce conducted EMI-critical in multi-rail telecom or industrial systems.
How does the BOOST pin improve efficiency in CS51413EDR8G?
The BOOST pin in CS51413EDR8G provides elevated base drive to the integrated NPN switch, ensuring saturation and reducing VCE(sat) to 0.4–1.0 V at 1.5 A. This directly cuts conduction loss-verified by Figure 12 in the datasheet-and improves full-load efficiency, especially at high input voltages. A 0.1 µF capacitor and fast diode (e.g., 1N4148) form the standard bootstrap network.
What protection features are built into CS51413EDR8G?
CS51413EDR8G integrates thermal shutdown (175–195 °C trip, 42 °C hysteresis), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 130 kHz), current limit foldback (to 0.9–2.1 A), and soft-start via VC pin. These protections are fully documented in Sections 4–5 of the datasheet and operate autonomously without external components.
Is CS51413EDR8G pin-compatible with any industry-standard alternatives?
Yes, CS51413EDR8G is functionally pin-compatible with the LT1375, as explicitly stated in the datasheet's "Features" section and "Product Selection Guide." This compatibility covers SOIC-8 pin assignment, electrical interface, and basic control logic-enabling drop-in replacement in existing LT1375 designs without PCB revision, provided V²-specific benefits (e.g., simplified compensation) are leveraged.
CS51413EDR8G 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
CS51413EDR8G FAQ
1.How can I place an order for CS51413EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413EDR8G 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 CS51413EDR8G reliable?
The price and inventory of CS51413EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413EDR8G is usually 5 days.
3.What payment methods are accepted for CS51413EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413EDR8G?
CS51413EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413EDR8G 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 CS51413EDR8G?
For technical support, including CS51413EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413EDR8G requirements.
6.How does Aetrix verify that CS51413EDR8G is sourced from the original manufacturer or authorized distributors?
All CS51413EDR8G 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 CS51413EDR8G meets industry standards.
7.What is the process for return or replacement of CS51413EDR8G?
All CS51413EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51413EDR8G, 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 CS51413EDR8G part is unused and in its original packaging.
Return procedure for CS51413EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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