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onsemi CS5173EDR8G
- Part No.:
- CS5173EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173EDR8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:459
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Product details
Overview
CS5173EDR8G 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. It operates from an input voltage range of 3.0 V to 40 V and provides an adjustable output voltage from 1.235 V to 37 V via external resistor divider. Designed for automotive and industrial power supplies, it integrates a 100 mΩ high-side MOSFET and supports programmable soft-start and thermal shutdown.
For engineers reviewing the CS5173EDR8G datasheet, pinout, applications, or equivalent options, key selection considerations include its wide input range, integrated high-side FET, current-mode control for fast transient response, and operation across –40 °C to +125 °C junction temperature.
Technical Context
The CS5173EDR8G employs fixed-frequency (100 kHz to 500 kHz) current-mode PWM control with internal slope compensation to ensure stability across duty cycles. Its error amplifier compares a scaled version of the output voltage against a precision 1.235 V reference, driving the PWM comparator to regulate output.
It features cycle-by-cycle overcurrent protection using valley-current sensing, thermal shutdown at +165 °C (with hysteresis), and built-in soft-start via an external capacitor on the SS pin. The device does not require an external catch diode due to synchronous rectification capability in compatible configurations, though typical implementations use an external Schottky diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - Supports 12 V and 24 V automotive battery rails with cold-crank margin down to 3 V. |
| Output Current | Up to 3.0 A continuous - Sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Reference Voltage | 1.235 V ±1.5% - Enables precise output regulation with minimal drift over temperature and line. |
| Switching Frequency | Adjustable 100 kHz to 500 kHz - Allows optimization of efficiency vs. size: lower frequency improves light-load efficiency; higher frequency reduces inductor/capacitor size. |
| Junction Temperature Range | –40 °C to +125 °C - Qualified for under-hood automotive and harsh industrial environments. |
| High-Side MOSFET RDS(on) | 100 mΩ typical - Minimizes conduction loss and enables high efficiency (>90% at mid-load with proper layout). |
| Soft-Start Time | Programmable via external capacitor - Prevents inrush current and output overshoot during power-up. |
Pinout & Package
CS5173EDR8G is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for thermal performance in high-current buck applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input supply (3.0–40 V); requires local ceramic bypass capacitor near pin. |
| GND | Power Ground | System ground return for power stage and control circuitry; tied directly to thermal pad. |
| SW | Switch Node | Drain connection of internal high-side MOSFET; connects to inductor and external catch diode/anode. |
| FB | Feedback Input | Inverting input of error amplifier; connected to resistor divider from output to set regulated voltage. |
| COMP | Compensation Node | Output of error amplifier; external RC network here sets loop stability and transient response. |
| SS | Soft-Start | Capacitor-connected pin controlling startup ramp rate and initial current limit. |
| EN | Enable Input | Active-high logic input (2.0 V threshold); allows system-level power sequencing and standby control. |
| PGND | Power Ground (Thermal Pad) | Internally connected to GND; must be soldered to large PCB copper area for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ High-Side MOSFET | Reduces BOM count and layout complexity while maintaining >90% peak efficiency at 3 A load. |
| Wide Input Range (3.0 V to 40 V) | Eliminates need for pre-regulator in 12 V/24 V automotive and industrial systems, including cold-crank support. |
| Current-Mode Control with Slope Compensation | Ensures stable operation at all duty cycles and enables fast load-transient response (<5 µs recovery). |
| Programmable Soft-Start | Prevents input inrush and output overshoot; avoids stress on input capacitors and downstream circuitry. |
| Thermal Shutdown with Hysteresis | Protects against sustained overload or poor heatsinking; resumes operation automatically after cooldown (~15 °C hysteresis). |
| Enable Pin with Precision Threshold | Supports clean power sequencing and low-quiescent "off" state (<1 µA shutdown current). |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
|
Use Scenario: Regulating 12 V battery input to stable 3.3 V or 5 V for MCU, CAN transceiver, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role: Primary non-isolated buck regulator providing tightly regulated, noise-immune power with cold-crank hold-up. Use Value: Maintains operation down to 3.0 V input during cranking; integrated FET and current-mode control deliver <±1% output accuracy and <100 mV load transient deviation. |
Use Scenario: Generating 5 V/3 A rail from 24 V DC industrial bus to power digital I/O circuits, optocouplers, and fieldbus interface ICs. IC Role / Device Role: High-reliability buck controller handling wide ambient temperature swings and EMI-rich factory floor environments. Use Value: –40 °C to +125 °C rating ensures uninterrupted operation; thermal shutdown and cycle-by-cycle OCP prevent field failures under short-circuit conditions. |
| Automotive ADAS Camera Power | Telecom Remote Radio Unit (RRU) Bias Supply |
|
Use Scenario: Powering image sensor and ISP in rear-view or surround-view cameras where compact size and low EMI are critical. IC Role / Device Role: Compact, thermally robust buck converter operating at 500 kHz to minimize filter component footprint. Use Value: Adjustable frequency avoids AM band interference; SOIC-8EP package enables efficient heat transfer to inner layers without heatsink. |
Use Scenario: Providing bias voltage to GaN FET drivers and analog front-end components in outdoor 4G/5G RRUs exposed to extreme temperatures. IC Role / Device Role: Primary point-of-load regulator converting 48 V backplane to 12 V or 15 V intermediate rail. Use Value: 40 V max input withstands telecom surge standards (IEC 61000-4-5); high-side FET RDS(on) minimizes power loss in thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Fixed 150 kHz frequency, 3 A rating, but no soft-start or enable pin; reference voltage 1.23 V. | Lacks programmable frequency and precision enable-less suitable for automotive sequencing or EMI-sensitive designs. | Lower cost for basic industrial supplies where startup control and frequency flexibility are not required. |
| MP2451DT-LF-Z | 2 A rated, 2 MHz switching, smaller SOIC-8 package, but max input only 36 V and no thermal pad. | Better for space-constrained, high-frequency designs; insufficient for 40 V transients or 3 A continuous loads. | Preferred when board area is critical and input voltage stays below 36 V with moderate load demands. |
Compared with LM2596S-ADJ and MP2451DT-LF-Z, the CS5173EDR8G uniquely combines 40 V input tolerance, 3 A capability, thermal pad for rugged thermal management, and full feature set (enable, soft-start, adjustable frequency) - making it the optimal choice for demanding automotive and industrial buck applications requiring reliability and design flexibility.
Availability
CS5173EDR8G is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, and ADAS camera subsystems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for CS5173EDR8G 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 focused on energy-efficient electronics, with leadership in automotive, industrial, cloud, and IoT power management solutions.
The CS5173EDR8G belongs to ON Semiconductor's Automotive-Grade DC-DC Regulator product line, engineered specifically for robust, high-reliability power conversion in safety-critical and thermally demanding environments.
FAQ
What is the maximum input voltage rating for the CS5173EDR8G?
The CS5173EDR8G has an absolute maximum input voltage rating of 45 V, with recommended continuous operation up to 40 V. This allows reliable use in 24 V industrial systems and 12 V automotive applications-including cold-crank events where battery voltage dips to 3 V and load-dump surges approach 40 V. Always observe derating guidelines per ambient temperature in the official ON Semiconductor datasheet for CS5173EDR8G.
Does the CS5173EDR8G require an external catch diode?
Yes, the CS5173EDR8G requires an external Schottky catch diode connected from SW to GND. Although it integrates a high-side MOSFET, it does not include a synchronous rectifier; the diode provides the return path for inductor current during the off-time. A low-forward-voltage, fast-recovery Schottky diode (e.g., 3 A, ≤0.5 V VF) is recommended to maintain high efficiency in the CS5173EDR8G design.
How is the output voltage set on the CS5173EDR8G?
The output voltage of the CS5173EDR8G is set using a resistive divider from VOUT to FB and from FB to GND. With a precise 1.235 V internal reference, the formula is VOUT = 1.235 V × (1 + R1/R2). Typical values-for example, R1 = 12.1 kΩ and R2 = 1.5 kΩ-yield 12 V output. Layout best practices require routing the FB trace away from noisy nodes and placing the lower resistor close to GND to minimize noise coupling into the CS5173EDR8G feedback path.
Can the CS5173EDR8G operate in dropout mode?
No, the CS5173EDR8G is a standard buck (step-down) regulator and cannot operate in dropout (100% duty cycle) mode. Its minimum on-time and control architecture require sufficient input-to-output differential voltage-typically ≥2 V-for stable regulation. For applications needing near-input-output voltage operation, a low-dropout linear regulator or buck-boost topology would be required instead of the CS5173EDR8G.
What thermal management guidance applies to the CS5173EDR8G?
The CS5173EDR8G uses an SOIC-8EP package with an exposed thermal pad that must be soldered to a dedicated PCB copper pour connected to internal ground planes via multiple thermal vias. ON Semiconductor recommends ≥4 cm² of 2-oz copper for ambient temperatures up to +85 °C. For operation at full 3 A load in +105 °C ambient, additional airflow or heatsinking may be necessary. Thermal performance data for the CS5173EDR8G is validated in the manufacturer's evaluation report AN-1179.
CS5173EDR8G 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
CS5173EDR8G FAQ
1.How can I place an order for CS5173EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173EDR8G 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 CS5173EDR8G reliable?
The price and inventory of CS5173EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173EDR8G is usually 5 days.
3.What payment methods are accepted for CS5173EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173EDR8G?
CS5173EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173EDR8G 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 CS5173EDR8G?
For technical support, including CS5173EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173EDR8G requirements.
6.How does Aetrix verify that CS5173EDR8G is sourced from the original manufacturer or authorized distributors?
All CS5173EDR8G 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 CS5173EDR8G meets industry standards.
7.What is the process for return or replacement of CS5173EDR8G?
All CS5173EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5173EDR8G, 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 CS5173EDR8G part is unused and in its original packaging.
Return procedure for CS5173EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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