My Inquiry
My Account
onsemi CS51413EDR8
- Part No.:
- CS51413EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51413EDR8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,274
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS51413EDR8 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 ultrafast transient response for point-of-load DC-DC conversion in industrial power supplies.
For engineers reviewing the CS51413EDR8 datasheet, pinout, applications, or equivalent options, key selection considerations include its 520 kHz switching frequency, SYNC pin compatibility with external clocks (575–880 kHz), foldback protection at VFB < 0.29 V, BOOST pin bootstrapping for reduced saturation voltage, and SOIC-8 package thermal performance under continuous 1.5 A load.
Technical Context
The CS51413EDR8 implements V² control architecture, where both PWM comparator inputs derive from the output feedback signal - one path providing fast AC ripple (FFB) and the other delivering filtered DC error (SFB) via the VC pin. This decouples transient response from error amplifier bandwidth while maintaining tight DC regulation.
It features cycle-by-cycle current limiting (1.6–3.0 A typ), thermal shutdown at 175–195 °C, frequency foldback to 130 kHz during short circuit, and active-low SHDNB pin with 85 µA shutdown quiescent current. The SYNC pin accepts TTL-compatible external clocks and disables foldback during sync mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal; enables compact magnetics and low-output-ripple designs with ≤10 µH inductors. |
| Input Voltage Range | 4.5 V to 40 V; supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output Current | 1.5 A continuous; sustained by on-chip NPN transistor with BOOST-assisted saturation voltage ≤0.7 V @ 1.5 A. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction and current limit foldback to protect under overload/short-circuit conditions. |
| SYNC Frequency Range | 575–880 kHz; allows noise-sensitive applications to synchronize to system clock and avoid beat frequencies. |
| Shutdown Quiescent Current | 20 µA typical; reduces system standby power when SHDNB is pulled low, critical for battery-backed subsystems. |
| Thermal Shutdown Trip | 175–195 °C; provides robust overtemperature protection with 42 °C hysteresis to prevent oscillation near trip point. |
Pinout & Package
CS51413EDR8 is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST, Pin 2–4 are VIN, Pin 5 is VSW, Pin 6 is SHDNB, Pin 7 is GND, and Pin 8 is VFB. VC and SYNC functions are assigned to internal nodes not brought out in this variant's SOIC-8 configuration per datasheet Figure 1 and Package Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap drive supply | Provides elevated base drive to on-chip NPN switch; reduces saturation voltage and improves efficiency at high VIN. |
| VIN (Pins 2–4) | Main power input | Supplies primary bias to internal circuitry and collector of integrated NPN switch; accepts 4.5–40 V with −0.3 V absolute min rating. |
| VSW (Pin 5) | Switch emitter node | Connects to inductor; swings negative to −1.0 V (t < 50 ns); requires external catch diode and low-inductance PCB layout. |
| SHDNB (Pin 6) | Active-low enable | TTL-compatible shutdown input; pulls internal rails offline when <1.0 V; draws <85 µA in sleep mode. |
| GND (Pin 7) | Power return | Common reference for all internal circuits and switch emitter; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 8) | Error amplifier inverting input | Senses output voltage divider; initiates foldback if <0.29 V; sets regulation point at 1.270 V internal reference. |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers sub-10 µs load transient recovery without requiring high-bandwidth error amplifiers or complex compensation. |
| SYNC pin interface | Enables deterministic switching alignment across multiple converters to suppress EMI peaks and simplify filtering. |
| BOOST-assisted NPN switch | Reduces conduction loss by maintaining transistor in deep saturation, lowering VCE(sat) to ≤0.7 V at full 1.5 A load. |
| Frequency & current foldback | Simultaneously cuts switching frequency to 25% and limits peak current to ~1.5 A during fault conditions, limiting total dissipation. |
| Soft-start via VC pin | Uses internal error amplifier source current to ramp VC voltage; eliminates need for external soft-start circuitry or dedicated pin. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Regulating 12 V battery input to stable 3.3 V or 5 V for microcontrollers and CAN transceivers in harsh environments. IC Role / Device Role / Timing Role: Primary buck controller managing point-of-load conversion with immunity to voltage transients and thermal cycling. Use Value: 520 kHz operation minimizes filter size; SYNC capability aligns switching with vehicle bus clocks to reduce conducted EMI. | Use Scenario: Generating 5 V rail for sensor interfaces and LIN transceivers from variable 9–16 V automotive battery supply. IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck regulator with built-in fault protection and wide VIN tolerance. Use Value: V² control ensures <50 µs recovery from 50% load steps; foldback protection sustains operation during cold-crank dips and load dump events. |
| Telecom Line Card Supplies | Medical Diagnostic Equipment |
Use Scenario: Providing isolated 3.3 V/1.5 A output from 48 V backplane in multi-channel telecom line cards. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in parallel with synchronized switching to suppress inter-channel crosstalk. Use Value: 520 kHz + SYNC enables narrow-band EMI filtering; BOOST pin maintains efficiency across full 4.5–40 V input range. | Use Scenario: Powering FPGA I/O banks and ADC front-ends in portable ultrasound or patient monitors requiring low-noise, reliable 1.8 V or 2.5 V rails. IC Role / Device Role / Timing Role: Precision-regulated buck stage with soft-start and thermal shutdown for safety-critical subsystems. Use Value: 2.0% reference tolerance and 1.270 V internal VREF ensure ±1.5% output accuracy; shutdown current <85 µA extends battery life. |
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 operates at 250 kHz; lacks SYNC pin and V² architecture; higher quiescent current (6 mA vs 6.25 mA). | Lower switching frequency increases inductor size; no synchronization option limits EMI control in dense layouts. | Select only if legacy LT1375 footprint reuse is mandatory and 520 kHz operation is unnecessary. |
| MP2315GJ-Z | Monolithic 2 A buck with 500 kHz switching; uses current-mode control; no BOOST or SYNC pins; different pinout and package (TSOT23-8). | Higher current rating but no external sync or bootstrapping; less suitable for high-VIN (>24 V) or noise-sensitive multi-rail systems. | Prefer for cost-sensitive, space-constrained designs where 1.5 A margin and advanced control features are not required. |
Compared with LT1375CS8#PBF and MP2315GJ-Z, CS51413EDR8 uniquely combines 520 kHz V² control, SYNC capability, and BOOST-driven NPN switch in SOIC-8 - enabling superior transient response, EMI predictability, and high-VIN efficiency without layout redesign.
Availability
CS51413EDR8 is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, and telecom line card supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51413EDR8 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5141X product line was designed specifically for high-transient-response, wide-input-voltage buck conversion in space-constrained industrial and automotive systems - emphasizing simplicity, reliability, and thermal robustness.
FAQ
What is the maximum input voltage rating for CS51413EDR8?
The CS51413EDR8 has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation above 40 V risks permanent damage. The device is specified for continuous operation from 4.5 V to 40 V, making it suitable for 24 V industrial buses and 36 V automotive systems. Exceeding 40 V violates the Absolute Maximum Ratings table in the datasheet and may trigger latch-up or junction breakdown.
Does CS51413EDR8 require an external bootstrap capacitor?
Yes, CS51413EDR8 requires an external bootstrap capacitor connected between BOOST and VSW pins. A 0.1 µF ceramic capacitor (e.g., X7R, 16 V rating) is recommended per the datasheet. This capacitor supplies the base drive needed to saturate the internal NPN switch, reducing VCE(sat) and improving efficiency - especially at high input voltages. Omitting it degrades regulation and increases thermal stress on CS51413EDR8.
Can CS51413EDR8 be synchronized to an external clock?
Yes, CS51413EDR8 supports external synchronization via its SYNC pin. It accepts TTL-compatible clock signals in the 575–880 kHz range, with threshold voltage of 1.0–1.9 V. During sync mode, the internal oscillator is disabled and switching is locked to the external edge-triggered signal. Note that frequency foldback is disabled during sync, so external fault management remains essential.
What is the purpose of the VFB pin on CS51413EDR8?
The VFB pin on CS51413EDR8 serves as the inverting input to the internal error amplifier and sets the output voltage via an external resistor divider. Its nominal regulation point is 1.270 V. When VFB falls below 0.29 V, CS51413EDR8 activates foldback protection - reducing switching frequency to 130 kHz and limiting peak current to ~1.5 A. This dual-action safeguard prevents thermal runaway during short-circuit or severe overload events.
Is CS51413EDR8 pin-compatible with any industry-standard regulators?
Yes, CS51413EDR8 is functionally pin-compatible with the LT1375 in SOIC-8 packages. Both share identical pin assignments for BOOST, VIN, VSW, SHDNB, GND, and VFB. However, CS51413EDR8 adds SYNC functionality and V² control - features absent in LT1375. Layout reuse is possible, but full feature parity requires verifying external component values and timing constraints per each device's respective datasheet.
CS51413EDR8 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
CS51413EDR8 FAQ
1.How can I place an order for CS51413EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51413EDR8 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 CS51413EDR8 reliable?
The price and inventory of CS51413EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51413EDR8 is usually 5 days.
3.What payment methods are accepted for CS51413EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51413EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51413EDR8?
CS51413EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51413EDR8 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 CS51413EDR8?
For technical support, including CS51413EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51413EDR8 requirements.
6.How does Aetrix verify that CS51413EDR8 is sourced from the original manufacturer or authorized distributors?
All CS51413EDR8 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 CS51413EDR8 meets industry standards.
7.What is the process for return or replacement of CS51413EDR8?
All CS51413EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51413EDR8, 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 CS51413EDR8 part is unused and in its original packaging.
Return procedure for CS51413EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS51413EDR8 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
