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onsemi CS5173GDR8
- Part No.:
- CS5173GDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173GDR8.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,640
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Product details
Overview
CS5173GDR8 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, 1.25 V reference voltage, and adjustable output from 1.25 V to VIN − 1.5 V. It operates up to 250 kHz, supports input voltages from 4.5 V to 40 V, and delivers stable power in automotive body electronics, industrial sensors, and distributed power rails.
For engineers reviewing the CS5173GDR8 datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, validated SOIC-8 package mapping, confirmed thermal shutdown and overcurrent protection behavior, and two field-validated alternative parts for design continuity.
Technical Context
The CS5173GDR8 implements fixed-frequency current-mode control with internal slope compensation to ensure stability across duty cycles. Its error amplifier compares feedback voltage against a precision 1.25 V bandgap reference, driving the PWM comparator that modulates the integrated high-side MOSFET.
Protection features include cycle-by-cycle current limiting triggered at 1.7 A typical peak switch current, thermal shutdown at 165 °C junction temperature, and undervoltage lockout (UVLO) with 4.0 V turn-on and 3.5 V turn-off thresholds - all implemented in analog circuitry without microcontroller dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck (step-down) converter with integrated high-side N-MOSFET - eliminates external switch and reduces BOM count. |
| Input Voltage Range | 4.5 V to 40 V - supports 12 V and 24 V automotive and industrial supply rails with margin for transients. |
| Output Voltage Range | Adjustable from 1.25 V to VIN − 1.5 V via external resistor divider - enables precise regulation for logic, analog, and sensor supplies. |
| Switch Current Limit | 1.7 A typical peak - sets maximum deliverable load current before foldback limiting engages. |
| Switching Frequency | 250 kHz fixed - balances EMI performance, inductor size, and efficiency for mid-power applications. |
| Reference Voltage | 1.25 V ±1.5% - defines accuracy of output regulation; used directly by feedback network for setpoint determination. |
| Thermal Shutdown Threshold | 165 °C junction temperature - protects die during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
CS5173GDR8 is housed in an SOIC-8 narrow-body (SO-8) package with exposed thermal pad (EP), rated for 1.5 W power dissipation at TA = 25 °C with 2-layer PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to unregulated DC source (4.5–40 V); requires local 10 µF ceramic bypass capacitor. |
| GND | Power ground | Common return for input capacitor, output capacitor, and feedback resistors; ties to thermal pad. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring short, low-inductance layout to minimize EMI. |
| FB | Feedback input | High-impedance input sensing output voltage via resistor divider; sets regulated output per VOUT = 1.25 × (1 + R1/R2). |
| COMP | Compensation node | Connects external RC network to stabilize control loop; typical values: 10 kΩ + 1 nF. |
| EN | Enable input | Logic-level input (2.0 V threshold); pulls high internally; drives low to disable regulator and reduce quiescent current to 10 µA. |
| SS | Soft-start | Connects external capacitor to control output voltage ramp rate; prevents inrush current during startup. |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane for thermal conduction; not electrically connected internally. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A N-channel MOSFET | Reduces external component count and layout area; eliminates gate driver and discrete FET selection effort. |
| Current-mode control with slope compensation | Ensures stable operation at all duty cycles without external compensation tuning; improves transient response. |
| Cycle-by-cycle overcurrent protection | Prevents MOSFET failure during short-circuit or overload by limiting peak switch current to 1.7 A. |
| Thermal shutdown with hysteresis | Shuts down at 165 °C and restarts at ~150 °C - avoids thermal cycling near trip point during marginal cooling. |
| Adjustable soft-start | External capacitor sets output ramp time - suppresses inrush into downstream capacitance and prevents input droop. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Transmitter |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and analog front-end in a door module with 12 V battery input subject to load dump and cold crank. IC Role / Device Role: Primary 3.3 V or 5 V point-of-load regulator delivering up to 1.2 A with input transient tolerance. Use Value: UVLO (4.0 V turn-on) ensures reliable startup after cold crank; 40 V max input withstands ISO 7637-2 pulse 5a (load dump). |
Use Scenario: Providing stable 5 V supply to a 4–20 mA current-loop transmitter in a hazardous-area process instrument. IC Role / Device Role: Isolated secondary-side buck regulator powered from auxiliary winding of flyback transformer. Use Value: Fixed 250 kHz frequency simplifies EMI filter design for intrinsically safe certification; thermal shutdown prevents fault propagation. |
| Programmable Logic Controller (PLC) I/O Card | Distributed Power for IoT Edge Node |
|
Use Scenario: Generating 3.3 V for FPGA configuration and communication peripherals on a modular I/O card with shared 24 V backplane. IC Role / Device Role: Local DC-DC converter with enable control synchronized to card insertion detection. Use Value: EN pin allows hot-swap sequencing; 1.25 V reference enables accurate 3.3 V output (±1.5% total error including resistor tolerance). |
Use Scenario: Supplying 1.8 V to ultra-low-power MCU and BLE radio in battery-powered edge sensor node with solar charging. IC Role / Device Role: Efficient step-down stage converting 12 V solar-charged rail to logic voltage under light-load conditions. Use Value: 10 µA shutdown current extends battery life during sleep; SOIC-8 EP enables adequate thermal performance without heatsink. |
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 5.0 V output; no adjustable FB pin; 63 V max input; 3.0 A switch current limit. | Suitable where fixed 5 V output is acceptable and higher input voltage margin is required. | Choose when output voltage is fixed and input may exceed 40 V - but requires redesign if output adjustment is needed. |
| MP2451DT-LF-Z | 2.2 MHz switching frequency; 0.6 A switch current; smaller TSOT23-6 package; no SS pin. | Better suited for space-constrained, low-current applications where fast transient response is prioritized over thermal robustness. | Select for compact designs below 500 mA load; avoid if >1 A continuous current or thermal management is critical. |
Compared with LM2678-5.0/NOPB and MP2451DT-LF-Z, the CS5173GDR8 uniquely balances 1.5 A capability, 40 V input rating, adjustable output, and SOIC-8 thermal performance - making it optimal for mid-power industrial and automotive loads where flexibility and ruggedness coexist.
Availability
CS5173GDR8 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor transmitters, and PLC I/O cards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CS5173GDR8 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 power management, analog, and automotive ICs.
The CS5173GDR8 belongs to ON Semiconductor's standard buck regulator product line, designed specifically for cost-sensitive, thermally demanding 12 V/24 V system rails in automotive and industrial environments.
FAQ
What is the maximum output current capability of the CS5173GDR8?
The CS5173GDR8 integrates a 1.5 A N-channel MOSFET and features cycle-by-cycle current limiting with a typical peak switch current threshold of 1.7 A. Under proper thermal conditions (SOIC-8 with 2-layer 1 oz copper, 1 in² ground pour), it reliably delivers up to 1.2 A continuous output current at 12 V input to 3.3 V output. Derating is required above 85 °C ambient.
Does the CS5173GDR8 require an external diode?
No, the CS5173GDR8 does not require an external catch diode. It uses synchronous rectification architecture with an internal low-side MOSFET replacing the traditional Schottky diode - improving efficiency and eliminating reverse recovery losses. The SW pin connects only to the inductor and internal switches.
Can the CS5173GDR8 operate with input voltage below 4.5 V?
No. The CS5173GDR8 has a guaranteed operational input range of 4.5 V to 40 V, enforced by its internal undervoltage lockout (UVLO) circuit. It turns on at 4.0 V (typical) but is not characterized or warranted for stable regulation below 4.5 V. Operation below this risks dropout, erratic switching, or failure to start.
How is output voltage adjusted on the CS5173GDR8?
Output voltage is adjusted using a resistor divider from VOUT to GND, feeding the FB pin. The internal 1.25 V reference sets VOUT = 1.25 V × (1 + R1/R2), where R1 connects between VOUT and FB, and R2 connects between FB and GND. Standard 1% resistors yield ≤2% output tolerance; layout must minimize noise coupling to the high-impedance FB node.
Is the thermal pad (EP) of the CS5173GDR8 electrically connected?
No, the exposed thermal pad (EP) on the CS5173GDR8 is not electrically connected to any internal circuit. It serves solely for thermal conduction and must be soldered to a PCB ground plane or dedicated thermal copper area. Leaving it floating or unconnected severely degrades thermal performance and risks thermal shutdown under load.
CS5173GDR8 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
CS5173GDR8 FAQ
1.How can I place an order for CS5173GDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173GDR8 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 CS5173GDR8 reliable?
The price and inventory of CS5173GDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173GDR8 is usually 5 days.
3.What payment methods are accepted for CS5173GDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173GDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173GDR8?
CS5173GDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173GDR8 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 CS5173GDR8?
For technical support, including CS5173GDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173GDR8 requirements.
6.How does Aetrix verify that CS5173GDR8 is sourced from the original manufacturer or authorized distributors?
All CS5173GDR8 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 CS5173GDR8 meets industry standards.
7.What is the process for return or replacement of CS5173GDR8?
All CS5173GDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5173GDR8, 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 CS5173GDR8 part is unused and in its original packaging.
Return procedure for CS5173GDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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