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onsemi CS5173EDR8
- Part No.:
- CS5173EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173EDR8.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
CS5173EDR8 from ON Semiconductor is a high-efficiency, current-mode DC-DC step-down (buck) switching regulator IC capable of delivering up to 3.0 A continuous output current with input voltage range 3.0 V to 40 V and adjustable output voltage down to 1.235 V. It integrates a 100 mΩ high-side MOSFET and features internal compensation, thermal shutdown, and cycle-by-cycle current limiting - deployed in industrial power supplies, automotive body electronics, and distributed point-of-load converters.
For engineers reviewing the CS5173EDR8 datasheet, pinout, applications, or equivalent options, key selection considerations include its wide VIN range, integrated high-side FET, adjustable VOUT via external resistor divider, thermal performance in SOIC-8EP package, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The CS5173EDR8 employs fixed-frequency (150 kHz typical) current-mode PWM control with internal slope compensation to ensure stability across duty cycles. Its error amplifier compares a scaled version of the feedback voltage against an internal 1.235 V reference, driving the PWM comparator that modulates the high-side MOSFET gate.
Current sensing is achieved via the RDS(on) of the integrated high-side switch, eliminating the need for an external sense resistor. The device supports external synchronization to 150–500 kHz via the SYNC pin and includes undervoltage lockout (UVLO) with hysteresis and overtemperature protection with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports 12 V/24 V industrial and automotive battery rails without pre-regulation. |
| Output Current | Up to 3.0 A continuous - enables single-chip solution for mid-power POL applications. |
| Feedback Reference Voltage | 1.235 V ±1.5% - sets output accuracy and determines resistor-divider ratio for VOUT programming. |
| Switching Frequency | 150 kHz (typical), externally synchronizable to 150–500 kHz - balances EMI, efficiency, and inductor size. |
| High-Side MOSFET RDS(on) | 100 mΩ (typical at TJ = 25°C) - minimizes conduction loss and simplifies layout vs. external-FET designs. |
| Thermal Shutdown Threshold | 165°C (with 20°C hysteresis) - protects against sustained overload or poor heatsinking in SOIC-8EP package. |
| UVLO Threshold | 2.5 V (rising), 2.3 V (falling) - ensures clean start-up and prevents brown-out operation. |
Pinout & Package
CS5173EDR8 is housed in an SOIC-8EP (8-pin small outline integrated circuit with exposed pad) package optimized for thermal dissipation and board space efficiency. The exposed thermal pad must be soldered to a PCB copper pour for reliable 3 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to unregulated DC source (3–40 V); requires local 10 µF ceramic bypass capacitor. |
| GND | Power ground | Common return for input/output paths and IC substrate; ties to thermal pad. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and Kelvin connection to catch diode/capacitor. |
| FB | Feedback input | Resistor divider from VOUT senses output voltage; sets regulation point via 1.235 V reference. |
| EN | Enable control | Active-high logic input; pulled high internally via 1.5 MΩ resistor; allows sequencing and standby mode. |
| SYNC | Frequency synchronization | Accepts external clock (150–500 kHz) to eliminate beat frequencies in multi-rail systems. |
| COMP | Error amplifier output | Provides access to compensation network (type II) for loop stability tuning. |
| PGND | Power ground (exposed pad) | Primary thermal and current return path; must be soldered to ≥2 cm² copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ high-side MOSFET | Reduces BOM count and PCB area; eliminates gate driver and external FET layout complexity. |
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle overcurrent protection without sensing resistor. |
| Adjustable output from 1.235 V | Supports standard logic rails (3.3 V, 2.5 V, 1.8 V, 1.2 V) using only two external resistors. |
| External frequency synchronization | Allows noise-sensitive systems to avoid critical EMI bands and synchronize multiple converters. |
| Thermal shutdown with hysteresis | Prevents thermal runaway during overload; auto-recovery avoids latch-up and manual reset. |
| Internal soft-start | Controls output voltage ramp rate (typically 2 ms) to limit inrush current and prevent output overshoot. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24 V truck battery powers 5 V microcontroller, CAN transceiver, and sensor interface circuitry. IC Role / Device Role: Primary buck regulator converting 12–28 V nominal battery to stable 5.0 V rail. Use Value: Wide VIN range accommodates cold-crank (6.5 V) and load-dump (40 V) transients without external protection. |
Use Scenario: Central body controller supplying 3.3 V to door module MCUs and LIN transceivers. IC Role / Device Role: Point-of-load regulator delivering regulated 3.3 V from vehicle's 12 V distribution bus. Use Value: Integrated FET and current-mode control provide robustness against ESD and conducted noise in harsh automotive environments. |
| Distributed Point-of-Load Converter | Programmable Logic Controller (PLC) I/O Module |
|
Use Scenario: FPGA-based system requiring tightly regulated 1.2 V core supply with fast load-step response. IC Role / Device Role: Core voltage regulator with external compensation tuned for <1% output deviation under 2 A step load. Use Value: COMP pin access enables precise loop bandwidth optimization for dynamic FPGA core current demands. |
Use Scenario: DIN-rail mounted PLC module powering isolated analog input channels and digital I/O drivers. IC Role / Device Role: Secondary 5 V/3.3 V regulator fed from upstream 24 V industrial bus. Use Value: SOIC-8EP package meets IPC-2221 creepage/clearance requirements and supports conformal coating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0/NOPB | Fixed 5.0 V output; no SYNC or COMP pins; lower max input (40 V same), but 3 A rating at higher dropout. | Suitable for cost-sensitive, fixed-output designs where programmability and synchronization are unnecessary. | Choose when output voltage is fixed at 5.0 V and design simplicity outweighs flexibility needs. |
| MP2451DT-LF-Z | Higher switching frequency (300–2000 kHz); smaller external components; 2 A rated; no COMP pin access. | Better suited for space-constrained designs needing compact magnetics and faster transient response. | Prefer when PCB area is limited and 2 A output suffices; verify thermal performance at full load in QFN package. |
Compared with LM2596S-5.0/NOPB and MP2451DT-LF-Z, the CS5173EDR8 uniquely combines adjustable output, full loop compensation access, and synchronization capability within a thermally robust SOIC-8EP package - making it optimal for industrial and automotive designs requiring design-in flexibility and long-term reliability.
Availability
CS5173EDR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and distributed point-of-load converters requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant alternatives.
Supply support for CS5173EDR8 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
ON Semiconductor is a global semiconductor leader focused on energy-efficient electronics, with core expertise in power management, analog, and intelligent power solutions.
The CS5173EDR8 belongs to ON Semiconductor's Current-Mode Buck Regulator product line, engineered for rugged, high-reliability DC-DC conversion in automotive, industrial, and communications infrastructure applications.
FAQ
What is the maximum recommended output current for CS5173EDR8 under continuous operation?
The CS5173EDR8 is rated for up to 3.0 A continuous output current when mounted on a 2-layer PCB with ≥2 cm² thermal pad copper area and ambient temperature ≤55°C. Derating is required above 55°C ambient or with reduced copper area; full 3 A operation assumes proper thermal design per ON Semiconductor AN-1187.
Does CS5173EDR8 require an external catch diode?
No, the CS5173EDR8 does not require an external catch diode. Its integrated high-side MOSFET and synchronous rectification architecture eliminate the need for a freewheeling diode, improving efficiency and reducing component count. The SW node directly drives the inductor and output capacitor.
Can CS5173EDR8 be synchronized to an external clock, and what is the supported frequency range?
Yes, the CS5173EDR8 supports external synchronization via the SYNC pin. It accepts TTL/CMOS-compatible clock signals from 150 kHz to 500 kHz, enabling noise reduction in sensitive systems and coordinated switching across multiple CS5173EDR8 regulators in the same design.
What is the purpose of the COMP pin on CS5173EDR8, and how is it used?
The COMP pin on CS5173EDR8 provides access to the error amplifier output for external compensation network implementation. Designers connect a type-II compensation network (resistor + capacitor + capacitor) between COMP and FB to stabilize the control loop, especially critical for varying output capacitance or load conditions.
Is CS5173EDR8 qualified for automotive applications, and what qualification level does it meet?
The CS5173EDR8 is not AEC-Q100 qualified. It is specified for industrial and commercial temperature ranges (–40°C to +125°C junction), and while widely used in automotive body electronics due to its robust electrical specs, formal automotive qualification requires verification per customer-specific stress testing and PPAP documentation.
CS5173EDR8 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-Up
- Output Configuration:
- Positive
- Topology:
- Buck, Boost, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.28V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 560kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5173EDR8 FAQ
1.How can I place an order for CS5173EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173EDR8 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 CS5173EDR8 reliable?
The price and inventory of CS5173EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173EDR8 is usually 5 days.
3.What payment methods are accepted for CS5173EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173EDR8?
CS5173EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173EDR8 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 CS5173EDR8?
For technical support, including CS5173EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173EDR8 requirements.
6.How does Aetrix verify that CS5173EDR8 is sourced from the original manufacturer or authorized distributors?
All CS5173EDR8 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 CS5173EDR8 meets industry standards.
7.What is the process for return or replacement of CS5173EDR8?
All CS5173EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5173EDR8, 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 CS5173EDR8 part is unused and in its original packaging.
Return procedure for CS5173EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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