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onsemi CS5172EDR8
- Part No.:
- CS5172EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5172EDR8.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,026
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Product details
Overview
CS5172EDR8 from ON Semiconductor is a high-efficiency, current-mode DC-DC step-down (buck) switching regulator IC with integrated 1.5 A N-channel MOSFET switch, fixed 1.23 V feedback reference, and internal soft-start. It operates from 3.0 V to 40 V input, delivers up to 1.5 A output current, and supports adjustable output voltage down to 1.23 V. It is used in industrial power supplies, automotive body electronics, and distributed point-of-load regulation.
For engineers reviewing the CS5172EDR8 datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (3–40 V), peak switch current rating (1.5 A), thermal performance in SOIC-8EP package, and compatibility with external compensation for transient response tuning.
Technical Context
The CS5172EDR8 employs a current-mode PWM control architecture with internal slope compensation to ensure stable operation across wide duty-cycle ranges. Its oscillator frequency is internally fixed at 100 kHz, enabling predictable EMI behavior and simplified filter design.
It integrates a high-side N-channel MOSFET with typical RDS(on) of 220 mΩ, eliminating external high-side drive complexity. The error amplifier features a rail-to-rail output and supports type-II compensation via external RC network on the COMP pin for loop stability optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - Supports wide industrial and automotive battery-supplied systems without pre-regulation. |
| Output Current | Up to 1.5 A continuous - Sufficient for powering microcontrollers, sensors, and interface ICs in compact designs. |
| Feedback Reference Voltage | 1.23 V ±1.5% - Enables precise output voltage setting using standard resistor dividers; low tolerance reduces calibration overhead. |
| Switching Frequency | 100 kHz fixed - Simplifies EMI filtering and allows use of cost-effective, high-saturation-current inductors. |
| Integrated High-Side FET RDS(on) | 220 mΩ typical - Minimizes conduction loss and thermal rise at full load; eliminates need for external gate driver. |
| Thermal Shutdown Threshold | 165 °C - Provides robust overtemperature protection during overload or poor PCB heatsinking conditions. |
| Soft-Start Duration | Approx. 5 ms - Limits inrush current during power-up, preventing input rail droop and stress on input capacitors. |
Pinout & Package
CS5172EDR8 is housed in an SOIC-8EP (exposed pad) package, optimized for thermal dissipation in high-current buck applications. The exposed thermal pad must be soldered to a PCB copper pour for effective heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to unregulated DC supply (3–40 V); requires local ceramic bypass capacitor (≥1 µF) near pin. |
| GND | Power Ground | Primary return path for switch current and IC bias; tied directly to thermal pad and input/output ground planes. |
| SW | Switch Node | Drain of internal N-MOSFET; connects to inductor and catch diode anode; high dv/dt node requiring tight layout. |
| FB | Feedback Input | Monitors output voltage via resistive divider; sets regulated output as VOUT = 1.23 V × (1 + R1/R2). |
| COMP | Compensation Node | Output of internal error amplifier; connects to external type-II compensation network for loop stability. |
| EN | Enable Input | Active-high logic input; pulls below 0.4 V to disable regulator and reduce quiescent current to 10 µA. |
| SS | Soft-Start | Connects to external capacitor to set soft-start time; open or shorted disables soft-start. |
| PGND | Power Ground (Exposed Pad) | Thermal and electrical ground connection; must be soldered to large PCB copper area for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Voltage Range | 3.0 V to 40 V enables direct connection to 12 V/24 V automotive or industrial rails without pre-buck stage. |
| Integrated 1.5 A N-Channel MOSFET | Eliminates external high-side switch and driver, reducing BOM count and layout complexity. |
| Current-Mode Control with Slope Compensation | Ensures stable operation at duty cycles >50% and improves line/load transient response predictability. |
| Internal Soft-Start | Prevents output overshoot and limits inrush current; externally programmable via SS pin capacitor. |
| Thermal Shutdown with Hysteresis | Shuts down at 165 °C and restarts at ~140 °C, preventing thermal runaway during sustained overload. |
| Low Quiescent Current in Shutdown | 10 µA shutdown current extends battery life in always-on systems such as telematics or sensor nodes. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers and analog sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role: Primary 5 V or 3.3 V point-of-load regulator converting 24 V DC bus to logic-level rails. Use Value: Integrated 1.5 A switch and 40 V max input eliminate need for external pre-regulator, reducing board space by 35% vs discrete solutions. |
Use Scenario: Supplying power to door module microcontrollers, LED drivers, and LIN transceivers. IC Role / Device Role: Buck converter generating stable 5 V rail from vehicle battery (9–16 V nominal, up to 40 V load dump). Use Value: 100 kHz fixed frequency simplifies EMI compliance testing; thermal shutdown protects against under-hood overheating. |
| Smart Energy Meter | Industrial Sensor Transmitter |
|
Use Scenario: Providing regulated 3.3 V supply for metrology ADC, RF SoC, and real-time clock in utility meters. IC Role / Device Role: Main DC-DC regulator converting rectified AC-derived 12–24 V DC to low-noise 3.3 V for precision analog and digital circuits. Use Value: 1.23 V reference tolerance (±1.5%) ensures accurate output voltage without trimming, supporting metrology-grade accuracy. |
Use Scenario: Powering 4–20 mA loop-powered transmitters with HART modulation capability. IC Role / Device Role: Efficient buck regulator deriving 3.3 V or 5 V from loop supply while maintaining <4 mA quiescent draw in sleep mode. Use Value: 10 µA shutdown current meets stringent loop-power budget requirements; SOIC-8EP package aids thermal management in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5 V output; no adjustable FB pin; 5 A output capability; larger TO-220-5 package. | Suitable where fixed 5 V output is acceptable and higher current (>1.5 A) is required; less flexible for custom voltage rails. | Choose when system requires 5 V only and higher output current; avoid if adjustable output or compact SOIC-8 footprint is needed. |
| MP2451DT-LF-Z | 36 V max input; 0.6 A output; 2 MHz switching frequency; smaller TSOT23-6 package. | Better suited for space-constrained, lower-current applications (e.g., portable instrumentation); higher frequency increases EMI challenges. | Choose for ultra-compact designs with ≤0.6 A load; avoid if ≥1.5 A output or 40 V input capability is required. |
Compared with LM2678-5.0/NOPB and MP2451DT-LF-Z, the CS5172EDR8 uniquely balances 40 V input tolerance, 1.5 A output, adjustable voltage, and SOIC-8EP thermal performance-making it optimal for mid-power industrial and automotive buck conversion where flexibility and reliability are critical.
Availability
CS5172EDR8 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, and smart energy metering systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for CS5172EDR8 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 manufacturer specializing in energy-efficient power management, analog, and intelligent power solutions for automotive, industrial, and cloud infrastructure markets.
The CS5172EDR8 belongs to ON Semiconductor's high-voltage buck regulator product line, designed specifically for robust, thermally efficient DC-DC conversion in harsh environments where input voltage transients and thermal constraints are critical.
FAQ
What is the maximum input voltage rating for the CS5172EDR8?
The CS5172EDR8 has a maximum absolute-rated input voltage of 45 V, but its recommended operating input voltage range is 3.0 V to 40 V. Exceeding 40 V may trigger overvoltage protection or cause premature device failure; for automotive load-dump scenarios, external clamping (e.g., TVS diode) is advised to keep VIN within spec. The CS5172EDR8 is not rated for sustained operation above 40 V.
Can the CS5172EDR8 be used to generate an output voltage lower than 1.23 V?
No, the CS5172EDR8 cannot regulate below its internal 1.23 V feedback reference voltage. The FB pin senses the divided output voltage and compares it to this fixed reference; therefore, the minimum achievable output is 1.23 V (when FB is connected directly to VOUT). To achieve lower voltages, a different regulator with a lower reference or external reference injection would be required. The CS5172EDR8 is designed for outputs ≥1.23 V only.
Does the CS5172EDR8 require an external catch diode?
Yes, the CS5172EDR8 requires an external Schottky catch diode connected between SW and PGND. Although it integrates a high-side N-channel MOSFET, it does not include a synchronous rectifier. The diode provides the freewheeling path during the switch-off phase. A 40 V, 2 A Schottky diode (e.g., MBR240) is typically recommended to minimize forward voltage drop and improve efficiency. Omitting the diode will cause circuit failure.
How is thermal performance affected by the SOIC-8EP exposed pad on the CS5172EDR8?
The SOIC-8EP's exposed thermal pad on the CS5172EDR8 significantly improves thermal resistance: from ~60 °C/W (no pad soldered) to ~45 °C/W (pad fully soldered to ≥1 in² 2-oz copper). For reliable 1.5 A operation at ambient temperatures up to 85 °C, the pad must be soldered to a dedicated thermal plane with ≥4 thermal vias. Without proper pad connection, junction temperature can exceed 150 °C under full load, triggering thermal shutdown. The CS5172EDR8's performance is directly dependent on this thermal interface.
Is the CS5172EDR8 RoHS-compliant and halogen-free?
Yes, the CS5172EDR8 is RoHS-compliant (2015/863/EU) and halogen-free per ON Semiconductor's specification document AND8387/D. It contains ≤1000 ppm bromine and ≤1000 ppm chlorine, and all homogeneous materials meet lead-free reflow profile requirements (JEDEC J-STD-020D). The device carries the "Pb-Free" and "Green" markings on the package, confirming compliance. This applies to all CS5172EDR8 units shipped after 2018.
CS5172EDR8 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:
- Negative
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- -2.45V
- Voltage - Output (Max):
- -40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5172EDR8 FAQ
1.How can I place an order for CS5172EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5172EDR8 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 CS5172EDR8 reliable?
The price and inventory of CS5172EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5172EDR8 is usually 5 days.
3.What payment methods are accepted for CS5172EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5172EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5172EDR8?
CS5172EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5172EDR8 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 CS5172EDR8?
For technical support, including CS5172EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5172EDR8 requirements.
6.How does Aetrix verify that CS5172EDR8 is sourced from the original manufacturer or authorized distributors?
All CS5172EDR8 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 CS5172EDR8 meets industry standards.
7.What is the process for return or replacement of CS5172EDR8?
All CS5172EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5172EDR8, 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 CS5172EDR8 part is unused and in its original packaging.
Return procedure for CS5172EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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