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onsemi CS5173GD8G
- Part No.:
- CS5173GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173GD8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,061
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Product details
Overview
CS5173GD8G from ON Semiconductor is a high-efficiency, current-mode DC-DC step-down (buck) switching regulator IC with integrated 1.5 A MOSFET switch, operating from 3.0 V to 40 V input, delivering up to 1.5 A continuous output current at adjustable 1.23 V to 37 V output voltage, and featuring thermal shutdown, overcurrent protection, and 180 kHz fixed-frequency PWM operation - used in industrial power supplies and automotive body electronics.
For engineers reviewing the CS5173GD8G datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range compatibility, output current capability under thermal constraints, feedback reference accuracy, enable logic polarity, and thermal performance in compact PCB layouts.
Technical Context
The CS5173GD8G employs a current-mode control architecture with internal slope compensation for stable operation across wide duty-cycle ranges. It integrates a high-side N-channel MOSFET with typical RDS(on) of 220 mΩ and uses an external Schottky diode for synchronous rectification replacement.
Feedback is implemented via a precision 1.23 V reference connected to the FB pin, enabling adjustable output using a resistive divider. The device supports external synchronization via the SYNC pin and includes soft-start functionality controlled by an external capacitor on the SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-range unregulated inputs including automotive battery (9–16 V) and industrial 24 V rails without pre-regulation. |
| Output Current | Up to 1.5 A continuous - limited by thermal dissipation in SOIC-8 package; derates above +85°C ambient. |
| Feedback Reference Voltage | 1.23 V ±1.5% - sets output accuracy; enables precise regulation with standard resistor tolerances. |
| Switching Frequency | 180 kHz fixed - balances EMI, inductor size, and efficiency; allows use of low-cost, high-saturation-current shielded inductors. |
| Enable Logic Polarity | Active-high EN pin - simplifies interface with microcontroller GPIOs or system power sequencers without level-shifting. |
| Thermal Shutdown Threshold | 165°C junction - protects against sustained overload or poor heatsinking; auto-recovery after cooldown. |
| Quiescent Current | 5.5 mA typical - minimizes standby power loss in always-on systems such as telematics or sensor nodes. |
Pinout & Package
CS5173GD8G is housed in an SOIC-8 (SO-8) surface-mount package with exposed thermal pad (EP), optimized for thermal performance in high-current buck applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to raw input supply (3–40 V); requires local 10 µF ceramic bypass capacitor near pin. |
| GND | Power ground | Common return for input capacitor, output capacitor, and IC substrate; ties to thermal pad. |
| SW | Switch node | Drives external catch diode and inductor; high dv/dt node requiring tight layout and guard ring. |
| FB | Feedback input | Senses output voltage via resistive divider; high-impedance node sensitive to noise coupling. |
| EN | Enable control | Logic-level input (2.0 V threshold); pulls low to disable regulator and reduce quiescent current to 10 µA. |
| SS | Soft-start timing | Connects to external capacitor to control output voltage ramp rate and limit inrush current. |
| SYNC | Frequency synchronization | Accepts external clock (150–220 kHz) to eliminate beat frequencies in multi-rail systems. |
| EP | Thermal pad | Must be soldered to large copper pour for thermal conduction; electrically tied to GND internally. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A N-channel MOSFET | Eliminates external high-side switch; reduces BOM count and layout area while maintaining >85% efficiency at 12 VIN/5 VOUT. |
| Wide 3–40 V input range | Directly interfaces with automotive battery (cold-crank down to 3 V) and industrial 24 V/36 V systems without LDO pre-regulator. |
| Current-mode PWM control | Provides inherent cycle-by-cycle overcurrent limiting and fast transient response to load steps up to 1 A/µs. |
| 1.23 V precision feedback reference | Enables ±2% output regulation over line, load, and temperature using standard 1% resistors in feedback network. |
| Thermal shutdown with hysteresis | Shuts down at 165°C and restarts at ~145°C, preventing thermal runaway during sustained overload or airflow interruption. |
| External soft-start and sync capability | SS pin allows programmable startup time (1–100 ms); SYNC pin enables deterministic frequency alignment in multi-converter designs. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuitry in door module or lighting controller. IC Role / Device Role: Primary 5 V or 3.3 V buck regulator converting vehicle battery (9–16 V nominal, up to 40 V load dump) to stable logic rail. Use Value: Withstands automotive transients per ISO 7637-2; 1.5 A output supports multiple peripherals; SOIC-8 EP enables conduction cooling on metal-core PCB. | Use Scenario: Generates isolated 12 V auxiliary rail for analog input conditioning and relay drivers in modular PLC backplane. IC Role / Device Role: Non-isolated buck converter stepping down 24 V field bus to 12 V intermediate rail with high PSRR and low ripple. Use Value: Fixed 180 kHz switching avoids audible noise; current-mode control ensures stability with long trace inductance; thermal pad sustains full load at +70°C ambient. |
| Smart Sensor Node (4–20 mA Loop Powered) | Telecom Remote Radio Unit (RRU) Bias Supply |
Use Scenario: Supplies 3.3 V to ultra-low-power MCU and MEMS sensor in loop-powered field transmitter. IC Role / Device Role: Efficient buck regulator operating from 12–30 V loop voltage, delivering regulated 3.3 V at <100 mA while maintaining loop compliance. Use Value: 5.5 mA quiescent current preserves loop margin; wide VIN accommodates varying loop drop; EN pin enables MCU-controlled sleep mode. | Use Scenario: Provides bias voltage to GaN FET gate drivers and analog front-end in outdoor 5G RRU enclosure. IC Role / Device Role: Secondary buck stage converting 48 V telecom supply to 10 V gate drive rail with high reliability and low EMI. Use Value: SYNC pin aligns switching to system clock to suppress conducted emissions; thermal shutdown prevents failure under sealed-housing thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-5.0/NOPB | Fixed 5 V output, 3 A rating, 150 kHz switching, no SYNC or SS pins. | Best for cost-sensitive, fixed-output designs where adjustability and synchronization are unnecessary. | Select when output voltage is fixed at 5 V and higher current headroom is required without need for soft-start or frequency control. |
| MP2451DT-LF-Z | 36 V max VIN, 0.6 A output, 2 MHz switching, integrated soft-start, no thermal pad. | Suitable for space-constrained, high-frequency designs where small inductors are prioritized over thermal robustness. | Choose for compact PCBs needing faster transient response and smaller magnetics, accepting lower current and no exposed pad for thermal management. |
Compared with LM2596SX-5.0/NOPB and MP2451DT-LF-Z, the CS5173GD8G uniquely balances wide-input operation, 1.5 A capability, thermal pad support, and flexible control features (SYNC, SS, adjustable VOUT) - making it optimal for thermally demanding, variable-output industrial and automotive buck applications.
Availability
CS5173GD8G is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and smart sensor node designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for CS5173GD8G 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CS5173GD8G belongs to ON Semiconductor's Current-Mode Buck Regulator product line, designed specifically for rugged, wide-input industrial and automotive power conversion where reliability, thermal resilience, and transient robustness are critical.
FAQ
What is the maximum recommended output current for CS5173GD8G in SOIC-8 package?
The CS5173GD8G supports up to 1.5 A continuous output current under typical conditions (TA = +25°C, 4-layer PCB with 1-in² 2-oz copper pour on GND layer). Derating is required above +85°C ambient; full load is not sustainable at +105°C without forced air or enhanced thermal design. Always verify junction temperature using θJA = 60°C/W and measured power dissipation.
Does CS5173GD8G require an external catch diode?
Yes, the CS5173GD8G requires an external Schottky diode connected from SW to VOUT. Unlike synchronous buck controllers, it does not integrate a low-side switch; the diode provides the return path during the high-side MOSFET off-time. A 40 V, 2 A Schottky (e.g., MBR240) is commonly used to minimize forward voltage drop and improve efficiency.
Can CS5173GD8G operate with input voltage below 3.0 V?
No, CS5173GD8G has a minimum specified input voltage of 3.0 V. Operation below this threshold is not guaranteed: internal bias circuitry may fail to start, the MOSFET gate driver lacks sufficient headroom, and regulation cannot be maintained. For sub-3 V applications, consider low-input buck regulators such as the TPS62130 or AP6320x series.
How is the output voltage set on CS5173GD8G?
The output voltage of CS5173GD8G is set using a resistive divider from VOUT to GND, with the midpoint connected to the FB pin. The formula is VOUT = 1.23 V × (1 + R1/R2), where R2 is typically 10 kΩ to 100 kΩ. Precision resistors (±1%) are recommended to achieve overall output accuracy within ±3%. Do not leave FB floating - it must be biased.
Is the thermal pad (EP) on CS5173GD8G electrically connected internally?
Yes, the exposed thermal pad (EP) on the CS5173GD8G is internally connected to GND. It must be soldered to a dedicated GND copper pour on the PCB for both thermal performance and electrical integrity. Use at least 9 solder vias (0.3 mm diameter) connecting the pad to inner-layer GND planes. Failure to properly connect EP results in excessive junction temperature and premature thermal shutdown.
CS5173GD8G 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5173GD8G FAQ
1.How can I place an order for CS5173GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173GD8G 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 CS5173GD8G reliable?
The price and inventory of CS5173GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173GD8G is usually 5 days.
3.What payment methods are accepted for CS5173GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173GD8G?
CS5173GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173GD8G 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 CS5173GD8G?
For technical support, including CS5173GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173GD8G requirements.
6.How does Aetrix verify that CS5173GD8G is sourced from the original manufacturer or authorized distributors?
All CS5173GD8G 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 CS5173GD8G meets industry standards.
7.What is the process for return or replacement of CS5173GD8G?
All CS5173GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5173GD8G, 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 CS5173GD8G part is unused and in its original packaging.
Return procedure for CS5173GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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