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onsemi CS5173ED8G
- Part No.:
- CS5173ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173ED8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,163
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Product details
Overview
CS5173ED8G 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 1.5 MHz switching frequency, internal soft-start, and thermal shutdown protection. It delivers up to 1.5 A output current with input voltage range of 3 V to 40 V, supporting automotive infotainment power rails.
For engineers reviewing the CS5173ED8G datasheet, pinout, applications, or equivalent options, key selection considerations include its wide VIN range, integrated high-side FET, cycle-by-cycle current limiting, adjustable output voltage via external resistor divider, and operation across -40°C to +125°C junction temperature.
Technical Context
The CS5173ED8G employs a constant-frequency current-mode PWM control architecture with internal slope compensation to ensure stable operation under all load and line conditions. Its error amplifier compares feedback voltage against a precise 1.235 V reference, driving the PWM comparator to regulate output voltage.
It integrates a 1.5 A, 200 mΩ N-channel MOSFET switch and features built-in overcurrent protection with hiccup-mode recovery, thermal shutdown at 165°C, and undervoltage lockout (UVLO) with 2.5 V turn-on threshold and 2.3 V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 40 V - supports direct connection to automotive battery (cold-crank down to 3 V) without pre-regulation. |
| Output Current | Up to 1.5 A - sufficient for powering DSPs, microcontrollers, and interface ICs in embedded systems. |
| Switching Frequency | Fixed 1.5 MHz - enables use of small external inductors (≥2.2 µH) and ceramic capacitors, reducing board area. |
| Feedback Reference Voltage | 1.235 V ±1.5% - sets output voltage accuracy; allows precise regulation using standard resistor tolerances. |
| Junction Temperature Range | −40°C to +125°C - qualified for under-hood automotive and industrial environments. |
| UVLO Threshold | 2.5 V turn-on with 200 mV hysteresis - prevents erratic startup during battery brownouts. |
Pinout & Package
CS5173ED8G is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for thermal dissipation in high-current buck applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection (3–40 V); requires local 10 µF ceramic bypass capacitor. |
| GND | Power Ground | Power return path; tied directly to thermal pad for low-impedance heat sinking. |
| SW | Switch Node | Drain of internal N-MOSFET; connects to inductor and catch diode (or synchronous rectifier). |
| FB | Feedback Input | Resistor-divider midpoint; regulates output by comparing to 1.235 V internal reference. |
| EN | Enable Input | Active-high logic input; pulls below 0.4 V to disable regulator and reduce quiescent current to 10 µA. |
| COMP | Compensation Node | Connects external RC network to stabilize control loop; sets phase margin and transient response. |
| SS | Soft-Start | Connects external capacitor to control output voltage ramp rate and limit inrush current. |
| PGND | Power Ground (Thermal Pad) | Exposed pad on bottom of SOIC-8EP; must be soldered to large PCB copper area for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A, 200 mΩ N-MOSFET | Eliminates need for external high-side switch and associated gate drive circuitry. |
| Current-mode PWM control | Provides inherent cycle-by-cycle overcurrent protection and fast transient response. |
| Internal soft-start (SS pin) | Prevents output overshoot and limits input inrush current during power-up. |
| Hiccup-mode overcurrent protection | Shuts down and auto-restarts on sustained overload, preventing thermal damage. |
| Thermal shutdown with hysteresis | Disables regulator at 165°C and re-enables at ~150°C to protect silicon and PCB. |
Applications
| Automotive Infotainment | Industrial Sensor Hub |
|---|---|
|
Use Scenario: Powering audio DSP, display controller, and USB interface in head-unit modules. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V buck regulator supplying core logic and I/O rails. Use Value: Wide 3–40 V input accommodates cold-crank and load-dump transients without external protection. |
Use Scenario: Providing stable 3.3 V supply to multi-sensor node with CAN/LIN interface. IC Role / Device Role / Timing Role: Main system regulator delivering regulated power to MCU and analog front-end. Use Value: −40°C to +125°C operation ensures reliability in uncontrolled industrial enclosures. |
| Telematics Control Unit (TCU) | Point-of-Load for FPGA I/O Banks |
|
Use Scenario: Generating 1.8 V rail for cellular modem baseband processor. IC Role / Device Role / Timing Role: Secondary buck converter downstream of main 5 V rail. Use Value: 1.5 MHz switching enables compact LC filter design, critical for space-constrained TCU modules. |
Use Scenario: Local regulation of 1.2 V or 1.5 V for FPGA I/O banks requiring tight voltage tolerance. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator adjacent to FPGA BGA package. Use Value: Integrated MOSFET and current-mode control minimize output voltage deviation during dynamic I/O switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-ADJ/NOPB | 5 A output, 63 kHz fixed frequency, requires external MOSFETs; larger solution size. | Better suited for higher-current (>2 A) industrial supplies where efficiency at light load is less critical. | Choose when higher output current and lower EMI sensitivity outweigh board space constraints. |
| MP2451DT-LF-Z | 2 A output, 2 MHz switching, smaller 8-pin SOIC package but no exposed thermal pad; 3.3–36 V input. | Preferred for space-limited consumer electronics where 125°C max junction is sufficient. | Choose when footprint reduction is prioritized and thermal load remains within 1.2 A continuous. |
Compared with LM2678SD-ADJ/NOPB and MP2451DT-LF-Z, the CS5173ED8G offers superior thermal performance via its exposed pad, tighter reference voltage (1.235 V vs. 1.22 V), and automotive-grade temperature rating - making it optimal for ruggedized 1.5 A buck designs where reliability under thermal stress is critical.
Availability
CS5173ED8G is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor hubs, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS5173ED8G 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, sensors, and connectivity solutions for automotive, industrial, and cloud power applications.
The CS5173ED8G belongs to ON Semiconductor's Automotive-Grade DC-DC Regulator product line, designed specifically for robust, high-reliability power conversion in harsh environments including engine compartments and factory floors.
FAQ
What is the maximum recommended output current for CS5173ED8G under continuous operation?
The CS5173ED8G is rated for up to 1.5 A continuous output current when mounted on a 4-layer PCB with ≥2 cm² copper pour connected to the exposed thermal pad. Derating is required above 85°C ambient; full 1.5 A is guaranteed only up to 70°C ambient with proper thermal layout. The device enters thermal shutdown at 165°C junction temperature.
Does CS5173ED8G require an external catch diode?
No - the CS5173ED8G integrates a high-side N-channel MOSFET but does not include a synchronous rectifier. An external Schottky diode (e.g., MBR0530) is required between SW and GND for standard buck operation. For synchronous operation, a second controller or external gate driver is needed - CS5173ED8G itself does not support synchronous rectification.
Can CS5173ED8G operate with input voltage as low as 3.0 V?
Yes - the CS5173ED8G has a minimum operating input voltage of 3.0 V, verified across temperature and process corners. This enables direct regulation from single-cell LiFePO₄ batteries or post-ignition automotive rails. UVLO releases at 2.5 V nominal, ensuring clean startup even during deep battery discharge.
How is output voltage adjusted on CS5173ED8G?
Output voltage is set using a resistive divider from VOUT to FB and FB to GND. With a fixed 1.235 V internal reference, VOUT = 1.235 V × (1 + R1/R2). Standard 1% resistors yield ≤2% total output error. The FB pin draws only 100 nA, minimizing divider current and improving light-load efficiency.
Is CS5173ED8G AEC-Q100 qualified?
No - CS5173ED8G is not AEC-Q100 qualified. It is specified and tested for operation from −40°C to +125°C junction temperature and meets automotive-relevant stress tests (e.g., HTOL, ESD-HBM ±2 kV), but lacks formal AEC-Q100 certification. For AEC-Q100-compliant alternatives, consider ON Semiconductor's LV54000 or similar qualified buck regulators.
CS5173ED8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
CS5173ED8G FAQ
1.How can I place an order for CS5173ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173ED8G 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 CS5173ED8G reliable?
The price and inventory of CS5173ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173ED8G is usually 5 days.
3.What payment methods are accepted for CS5173ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173ED8G?
CS5173ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173ED8G 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 CS5173ED8G?
For technical support, including CS5173ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173ED8G requirements.
6.How does Aetrix verify that CS5173ED8G is sourced from the original manufacturer or authorized distributors?
All CS5173ED8G 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 CS5173ED8G meets industry standards.
7.What is the process for return or replacement of CS5173ED8G?
All CS5173ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5173ED8G, 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 CS5173ED8G part is unused and in its original packaging.
Return procedure for CS5173ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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