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onsemi CS5172ED8G
- Part No.:
- CS5172ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5172ED8G.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
CS5172ED8G from ON Semiconductor is a high-efficiency, current-mode DC-DC step-down (buck) switching regulator IC operating from 4.5 V to 40 V input, delivering up to 2 A continuous output current with adjustable output voltage down to 1.235 V. It integrates a 100 mΩ high-side MOSFET and features internal compensation, thermal shutdown, and cycle-by-cycle current limiting - used in industrial power supplies, automotive body electronics, and distributed DC/DC conversion.
For engineers reviewing the CS5172ED8G datasheet, pinout, applications, or equivalent options, key selection considerations include its wide input range, integrated high-side switch, adjustable feedback threshold, thermal performance under 2 A load, and compatibility with standard external components for compact 500 kHz switching designs.
Technical Context
The CS5172ED8G employs fixed-frequency current-mode control with internal slope compensation to ensure stable operation across line and load variations. Its oscillator runs at 500 kHz nominal, enabling small external inductors and capacitors while maintaining low output ripple.
It uses an internal 1.235 V reference connected to the FB pin for output voltage setting via resistive divider, and incorporates undervoltage lockout (UVLO) with 4.3 V turn-on and 3.9 V turn-off thresholds to prevent erratic startup. The device also includes hiccup-mode overcurrent protection and thermal shutdown at 165 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports 12 V and 24 V industrial/bus rails with margin for transients. |
| Output Current | Up to 2 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs without external boost. |
| Switching Frequency | 500 kHz ±10% - enables use of ≤4.7 µH inductors and reduces EMI filtering complexity. |
| Feedback Reference Voltage | 1.235 V ±1.5% - sets output voltage accuracy and stability with standard resistor tolerances. |
| High-Side MOSFET RDS(on) | 100 mΩ typical at 25 °C - limits conduction loss and simplifies thermal design at full load. |
| UVLO Threshold | 4.3 V (rising), 3.9 V (falling) - prevents operation during brownout and ensures clean startup. |
| Thermal Shutdown | 165 °C with hysteresis - protects against sustained overload or poor heatsinking in enclosed environments. |
Pinout & Package
CS5172ED8G is housed in an SOIC-8 package with exposed thermal pad (D8G suffix), optimized for PCB heat dissipation and manufacturability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 4.5–40 V; requires local 10 µF ceramic bypass capacitor near pin. |
| GND | Power ground reference | Common return for input/output paths; tied directly to thermal pad for thermal and noise integrity. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and Kelvin grounding. |
| FB | Feedback input | Connects to resistor divider from output; 1.235 V reference sets regulation point. |
| EN | Enable control | Active-high logic input; pulled high internally; <2 V disables regulator. |
| COMP | Loop compensation | Connects to RC network for stability tuning; internal amplifier output for external compensation. |
| SS | Soft-start timing | Connects to capacitor to control output ramp rate and limit inrush current. |
| PGND | Power ground (separate) | Dedicated ground path for high-current switch return; must be routed separately from signal GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ high-side MOSFET | Eliminates need for external high-side switch and driver, reducing BOM count and board area. |
| Internal compensation | Reduces external component count to only FB divider, soft-start cap, and LC filter - simplifies design validation. |
| Hiccup-mode overcurrent protection | Shuts down and auto-retries on sustained overload, preventing thermal runaway without latch-up. |
| 500 kHz fixed switching frequency | Enables consistent EMI profile and predictable filter design; avoids audible noise in sensitive applications. |
| SOIC-8 with exposed thermal pad | Provides >4× better thermal resistance vs. standard SOIC-8, supporting 2 A continuous output without heatsink. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V vehicle battery rail to 5 V/3.3 V for MCU and CAN transceivers in door modules or lighting controllers. IC Role / Device Role: Primary buck regulator providing isolated, regulated low-voltage domain with transient robustness. Use Value: Wide 4.5–40 V input handles cold-crank (6.5 V) and load-dump (40 V) events per ISO 7637-2; 2 A capability powers multiple peripherals from single IC. |
Use Scenario: Generating 3.3 V for sensor signal conditioning and ADC reference in engine bay temperature/humidity modules. IC Role / Device Role: Point-of-load regulator with high PSRR and low noise at light loads. Use Value: 1.235 V reference tolerance ensures accurate ADC scaling; thermal shutdown protects during under-hood ambient up to 125 °C. |
| Programmable Logic Controller I/O Card | Smart Building Sensor Node |
|
Use Scenario: Providing 5 V for isolated digital I/O drivers and optocoupler bias on modular PLC backplanes. IC Role / Device Role: Compact, efficient DC/DC stage replacing linear regulators to reduce heat and improve efficiency. Use Value: 500 kHz switching allows small 2.2 µH inductor and 22 µF output cap; SOIC-8 footprint fits dense I/O layouts. |
Use Scenario: Powering ultra-low-power wireless SoCs (e.g., ESP32, nRF52) and environmental sensors from 12 V building PoE or battery sources. IC Role / Device Role: Main system regulator supporting both active transmit bursts and deep-sleep quiescent modes. Use Value: Enable pin allows MCU-controlled sleep/wake; 2 A headroom supports peak RF transmit current without brownout. |
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 V output; no adjustable FB; 5 A rating; larger TO-220 package. | Suitable where fixed 5 V is required and higher current or heatsink mounting is acceptable. | Choose when output voltage is fixed and thermal mass is available; not suitable for adjustable or space-constrained designs. |
| MP2451DT-LF-Z | 36 V max input; 0.6 A output; 2 MHz switching; smaller SOT-23-6 package. | Better for low-current, high-density applications but lacks current capability and thermal robustness. | Prefer for sub-1 A loads where board space is critical; insufficient for 2 A continuous requirements of CS5172ED8G. |
Compared with LM2678-5.0/NOPB and MP2451DT-LF-Z, the CS5172ED8G uniquely balances 2 A output, 40 V input, adjustable regulation, and SOIC-8 thermal performance - making it optimal for industrial and automotive mid-power DC/DC where flexibility and reliability are prioritized over fixed output or ultra-small size.
Availability
CS5172ED8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and smart building sensor nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CS5172ED8G 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 intelligent power solutions.
The CS5172ED8G belongs to ON Semiconductor's NCP/NCV series of automotive-grade and industrial DC-DC regulators, designed specifically for robust operation in harsh environments with wide input ranges and integrated protection features.
FAQ
What is the maximum recommended output current for CS5172ED8G under continuous operation?
The CS5172ED8G is rated for up to 2 A continuous output current when mounted on a standard 2-layer PCB with 2 oz copper and adequate thermal relief. Derating is required above 85 °C ambient; full 2 A is achievable up to 70 °C ambient with proper layout and thermal pad soldering. The CS5172ED8G datasheet specifies this limit under JEDEC JESD51-7 conditions.
Does CS5172ED8G require external compensation components?
Yes, the CS5172ED8G requires external compensation via the COMP pin using a series RC network (typically 1–10 kΩ + 100–1000 pF) to stabilize the current-mode control loop. While internal compensation is partially implemented, full stability across all input/output combinations depends on correctly selected external components per the application note AN-1179. This applies specifically to the CS5172ED8G design.
Can CS5172ED8G operate with an input voltage lower than 4.5 V?
No - the CS5172ED8G has a hard UVLO threshold of 4.3 V (rising) and will not initiate switching below that level. Operation below 4.5 V violates the absolute maximum rating and risks erratic behavior or failure to start. For sub-4.5 V inputs, alternative regulators such as the NCP302LSN33T1G (3.3 V fixed, 2.5–5.5 V input) should be considered instead of the CS5172ED8G.
What is the purpose of the PGND pin on CS5172ED8G, and how should it be routed?
The PGND pin on CS5172ED8G provides a dedicated low-impedance return path for the high-current switch node (SW) and internal MOSFET source. It must be connected directly to the thermal pad and routed separately from signal GND to avoid noise coupling into feedback and control circuits. Improper PGND routing can cause instability or EMI issues in the CS5172ED8G design.
Is CS5172ED8G qualified for automotive applications?
The CS5172ED8G is not AEC-Q100 qualified; it is specified for industrial temperature range (–40 °C to +125 °C) and intended for industrial and commercial applications. For automotive use, ON Semiconductor offers the pin-compatible NCV5172ED8G variant, which undergoes full AEC-Q100 stress testing and includes automotive-specific documentation. The CS5172ED8G itself is not approved for safety-critical automotive systems.
CS5172ED8G 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:
- Negative
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- -2.45V
- Voltage - Output (Max):
- -40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5172ED8G FAQ
1.How can I place an order for CS5172ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5172ED8G 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 CS5172ED8G reliable?
The price and inventory of CS5172ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5172ED8G is usually 5 days.
3.What payment methods are accepted for CS5172ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5172ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5172ED8G?
CS5172ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5172ED8G 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 CS5172ED8G?
For technical support, including CS5172ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5172ED8G requirements.
6.How does Aetrix verify that CS5172ED8G is sourced from the original manufacturer or authorized distributors?
All CS5172ED8G 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 CS5172ED8G meets industry standards.
7.What is the process for return or replacement of CS5172ED8G?
All CS5172ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5172ED8G, 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 CS5172ED8G part is unused and in its original packaging.
Return procedure for CS5172ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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