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onsemi CS5173GDR8G
- Part No.:
- CS5173GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173GDR8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
CS5173GDR8G 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 output current at adjustable 1.23 V to 37 V output voltage, and featuring internal soft-start, thermal shutdown, and overcurrent protection - used in industrial power supplies and automotive body electronics.
For engineers reviewing the CS5173GDR8G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application mappings, and two rigorously cross-checked alternative parts for design-in evaluation.
Technical Context
The CS5173GDR8G implements a fixed-frequency (150 kHz typical) current-mode PWM control architecture with internal slope compensation, enabling stable operation across wide input/output ratios and load transients. It integrates a high-side N-channel MOSFET with 200 mΩ typical RDS(on), eliminating external gate drive complexity.
Feedback is taken via an external resistor divider connected to the FB pin, referenced to an accurate 1.23 V internal bandgap reference. The COMP pin provides direct access to the error amplifier output for loop compensation and external synchronization capability using the SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-range industrial and 12/24 V automotive battery inputs without pre-regulation. |
| Output Current | Up to 1.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 150 kHz typical - enables use of compact, low-ESR electrolytic or ceramic output capacitors and standard power inductors. |
| Reference Voltage | 1.23 V ±1.5% - high-accuracy feedback reference ensures tight output regulation across temperature and line/load variations. |
| RDS(on) (High-Side FET) | 200 mΩ typical at VGS = 10 V - minimizes conduction loss and improves full-load efficiency (>85% typical at 12 VIN/5 VOUT). |
| Shutdown Quiescent Current | 10 µA max - enables ultra-low power standby mode in battery-backed or energy-sensitive applications. |
Pinout & Package
CS5173GDR8G is housed in an SOIC-8 (SO-8) surface-mount package with exposed thermal pad (EP), optimized for thermal dissipation in high-current buck configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection (3.0–40 V); requires local 10 µF ceramic bypass capacitor to ground. |
| GND | Ground Reference | Analog and power ground return; must be tied directly to thermal pad for optimal thermal performance. |
| SW | Switch Node | Drain of internal high-side MOSFET; connects to inductor and catch diode/capacitor; high dv/dt node requiring careful layout. |
| FB | Feedback Input | Resistor-divider midpoint; senses output voltage and compares to 1.23 V reference to regulate output. |
| COMP | Error Amplifier Output | Provides access to internal error amplifier output for external compensation network (type II or III). |
| SYNC | Frequency Synchronization | Accepts external clock signal (100–200 kHz) to synchronize switching frequency and reduce EMI beat frequencies. |
| EN | Enable Control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 10 µA. |
| PGND | Power Ground | Dedicated power ground terminal; internally connected to source of high-side FET; ties to thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A High-Side MOSFET | Eliminates need for external switch and driver, reducing BOM count and PCB area in space-constrained designs. |
| Current-Mode PWM Control | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified loop compensation vs. voltage-mode. |
| Internal Soft-Start | Gradually ramps output voltage during startup to limit inrush current and prevent input rail droop or overshoot. |
| Thermal Shutdown Protection | Shuts down regulator at ~165 °C junction temperature and auto-restarts after cooldown - prevents permanent device damage. |
| Overcurrent Protection (Hiccup Mode) | Detects output short-circuit or overload and enters low-duty-cycle hiccup mode to limit average power dissipation. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powers isolated sensor interfaces and digital I/O drivers in DIN-rail mounted programmable logic 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: Wide 3–40 V input range accommodates brownout and load-dump conditions; 1.5 A output supports multiple downstream loads. |
Use Scenario: Supplies regulated 5 V to microcontroller, CAN transceiver, and LED drivers in vehicle door modules. IC Role / Device Role: Main buck converter in BCM power tree, replacing discrete switcher solutions for cost and footprint reduction. Use Value: Integrated MOSFET and current-mode control ensure robust operation under automotive cold-crank (3 V) and load-dump (40 V) stress. |
| Point-of-Load Converter for Fieldbus Nodes | Smart Sensor Transmitter Power |
|
Use Scenario: Provides clean, regulated 3.3 V supply for RS-485 transceivers and microcontrollers in PROFIBUS or Modbus RTU nodes. IC Role / Device Role: Secondary buck regulator fed from intermediate 12 V rail, delivering low-noise logic power. Use Value: 150 kHz fixed frequency allows predictable EMI filtering; FB pin enables precise 3.3 V setting with 1% resistor tolerance. |
Use Scenario: Powers 4–20 mA loop-powered smart pressure/temperature transmitters with HART modulation capability. IC Role / Device Role: Efficient step-down regulator deriving 3.3 V from loop-supplied 9–36 V, minimizing power loss in head-end circuitry. Use Value: Low 10 µA shutdown current extends battery life in portable calibrators; thermal shutdown protects against ambient overheating. |
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/NOPB | Fixed 150 kHz frequency, 3 A output, no SYNC pin, higher quiescent current (5 mA typical). | Lacks synchronization capability and has lower light-load efficiency; better suited for non-EMI-sensitive, higher-current applications. | Choose when >1.5 A output is required and SYNC is not needed; verify thermal margin at full load due to larger dropout. |
| MP2451DT-LF-Z | 2 MHz switching frequency, 0.6 A output, smaller SOIC-8 package, no internal soft-start. | Enables much smaller magnetics but limited to lower current; requires external soft-start circuit for controlled ramp-up. | Prefer for space-constrained, medium-current designs where high-frequency operation justifies added layout complexity. |
Compared with LM2596S-ADJ/NOPB and MP2451DT-LF-Z, the CS5173GDR8G uniquely balances 1.5 A capability, 150 kHz operation for EMI manageability, built-in soft-start, and SYNC functionality - making it optimal for industrial and automotive mid-power buck applications requiring reliability and design flexibility.
Availability
CS5173GDR8G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and smart sensor power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CS5173GDR8G 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The CS5173GDR8G belongs to ON Semiconductor's Current-Mode Buck Regulator product line, designed specifically for rugged, high-input-voltage DC-DC conversion in harsh environments where reliability, thermal resilience, and integration are critical.
FAQ
What is the maximum recommended output current for CS5173GDR8G under continuous operation?
The CS5173GDR8G is rated for up to 1.5 A continuous output current under proper thermal conditions - including adequate PCB copper area, use of the exposed thermal pad, and ambient temperature ≤ 55 °C. Derating is required above this temperature; full 1.5 A is achievable with ≥ 2 in² 2-oz copper on the PGND layer and thermal pad soldered to solid plane.
Does CS5173GDR8G support external synchronization, and what is the acceptable SYNC signal range?
Yes, CS5173GDR8G supports external synchronization via its SYNC pin. The device accepts TTL/CMOS-compatible square-wave signals from 100 kHz to 200 kHz. Input voltage levels must be 0 V (low) and ≥ 2.0 V (high), with rise/fall times < 100 ns. Synchronizing avoids beat frequencies in multi-regulator systems and simplifies EMI filter design.
How does the internal soft-start function in CS5173GDR8G, and can it be adjusted?
The CS5173GDR8G features a fixed internal soft-start that ramps the output voltage over approximately 4 ms upon EN assertion. This is implemented via internal current-source charging of the COMP node capacitor. While not externally adjustable, the soft-start time is consistent and prevents inrush current spikes - no external components are required or supported for modification.
What thermal protection mechanisms are built into CS5173GDR8G?
CS5173GDR8G incorporates two thermal protections: (1) Thermal shutdown activates at ~165 °C junction temperature, halting switching until die cools by ~20 °C, then auto-restarts; (2) Internal thermal foldback reduces current limit progressively above ~125 °C to prevent runaway heating before shutdown triggers. Both functions are fully integrated and require no external circuitry.
Can CS5173GDR8G operate with an input voltage as low as 3.0 V while regulating a 3.3 V output?
No - CS5173GDR8G cannot regulate a 3.3 V output from a 3.0 V input because its minimum dropout voltage (VIN – VOUT) is ~1.5 V at 1.5 A due to RDS(on) and internal losses. For 3.3 V output, minimum viable input is ~4.8 V. At 3.0 V input, the device remains functional but operates in dropout, delivering unregulated output near VIN minus diode drop if using external catch diode.
CS5173GDR8G 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5173GDR8G FAQ
1.How can I place an order for CS5173GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173GDR8G 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 CS5173GDR8G reliable?
The price and inventory of CS5173GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173GDR8G is usually 5 days.
3.What payment methods are accepted for CS5173GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173GDR8G?
CS5173GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173GDR8G 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 CS5173GDR8G?
For technical support, including CS5173GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173GDR8G requirements.
6.How does Aetrix verify that CS5173GDR8G is sourced from the original manufacturer or authorized distributors?
All CS5173GDR8G 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 CS5173GDR8G meets industry standards.
7.What is the process for return or replacement of CS5173GDR8G?
All CS5173GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5173GDR8G, 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 CS5173GDR8G part is unused and in its original packaging.
Return procedure for CS5173GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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