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onsemi CS5172ED8
- Part No.:
- CS5172ED8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5172ED8.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,866
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Product details
Overview
CS5172ED8 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 power rails.
For engineers reviewing the CS5172ED8 datasheet, pinout, applications, or equivalent options, key selection considerations include its wide input range (4.5–40 V), integrated high-side FET, fixed 200 kHz switching frequency, internal soft-start, and operation over –40 °C to +125 °C junction temperature.
Technical Context
The CS5172ED8 employs a current-mode PWM control architecture with an internal oscillator set to 200 kHz, enabling stable regulation under transient load steps without external loop compensation. Its error amplifier compares the feedback voltage (from an external resistor divider) against a precision 1.235 V reference.
Current sensing is achieved via the RDS(on) of the integrated high-side MOSFET, eliminating the need for an external sense resistor. The device enters hiccup-mode protection during sustained overcurrent or short-circuit conditions, and thermal shutdown activates at ~165 °C junction temperature with automatic recovery.
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 stages. |
| Feedback Reference Voltage | 1.235 V ±1.5% - enables precise output setting from 1.235 V to >36 V using standard resistor ratios. |
| Switching Frequency | 200 kHz fixed - balances EMI performance and external component size; avoids AM radio band. |
| High-Side MOSFET RDS(on) | 100 mΩ typical at TJ = 25 °C - minimizes conduction loss and simplifies layout vs. external-FET solutions. |
| Junction Temperature Range | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments without derating. |
| Soft-Start Time | Internal 5 ms - prevents inrush current and output overshoot during power-up. |
Pinout & Package
CS5172ED8 is housed in an 8-pin SOIC package (SOIC-8, 150 mil width) with exposed thermal pad (EP) for enhanced power dissipation. Pin 1 is marked by a dot or notch orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Connects to 4.5–40 V source; requires local 10 µF ceramic bypass capacitor near pin. |
| GND | Power ground | Common return for VIN, SW, and FB; ties to thermal pad for optimal heat transfer. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and Kelvin connection to catch diode/capacitor. |
| FB | Feedback input | Resistor divider midpoint; senses output voltage and closes regulation loop with internal 1.235 V reference. |
| EN | Enable control | Active-high logic input; ≥2.0 V enables regulator, <0.8 V disables with output discharged via internal 10 kΩ pulldown. |
| SS | Soft-start capacitor | Connects to external capacitor (typically 1–10 nF) to set soft-start ramp time and reduce inrush. |
| COMP | Error amplifier output | Not user-accessible; internally connected to current-sense comparator and PWM latch - no external compensation required. |
| EP | Thermal pad | Must be soldered to PCB copper pour for thermal management; electrically tied to GND internally. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ high-side MOSFET | Reduces BOM count and PCB area; eliminates gate driver and external FET layout complexity. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation. |
| Internal 1.235 V reference | Enables accurate output voltage setting across temperature and line variations with minimal external components. |
| Hiccup-mode overcurrent protection | Shuts down and auto-restarts during overload/short, preventing thermal runaway and enabling self-recovery. |
| Thermal shutdown with hysteresis | Triggers at ~165 °C and releases at ~145 °C, protecting silicon while allowing safe restart after cooling. |
| Internal soft-start (5 ms) | Prevents output overshoot and input inrush, eliminating need for external timing components or sequencing circuits. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V battery rail to 5 V or 3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role: Primary buck regulator providing isolated, low-noise, regulated auxiliary power. Use Value: Wide 4.5–40 V input accommodates cold-crank (6.5 V) and load-dump (40 V) events per ISO 7637-2. |
Use Scenario: Powering MCU, CAN transceivers, and LED drivers in door modules or lighting controllers. IC Role / Device Role: Compact, thermally robust point-of-load regulator on space-constrained PCBs. Use Value: Integrated FET and thermal pad enable 2 A output in SOIC-8 without heatsink, meeting AEC-Q100 Grade 1 requirements. |
| Distributed Power Architecture | Smart Sensor Node |
|
Use Scenario: Local regulation from 12 V backplane to 1.8 V or 2.5 V for FPGA I/O banks or ADCs. IC Role / Device Role: Secondary buck stage delivering clean, low-ripple power with minimal external parts. Use Value: Fixed 200 kHz frequency allows predictable filter design and EMI filtering; internal compensation reduces tuning effort. |
Use Scenario: Battery-powered environmental sensor node requiring efficient 3.3 V rail from Li-ion or 2xAA supply. IC Role / Device Role: Main system regulator enabling ultra-low quiescent current sleep mode via EN pin control. Use Value: EN pin supports deep-sleep wake-up sequencing; 1.235 V reference ensures stable ADC reference voltage accuracy. |
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 | Fixed 150 kHz frequency, higher RDS(on) (220 mΩ), no internal soft-start capacitor pin. | Limited to ≤3 A but requires larger output capacitor for same ripple; less suitable for fast-transient loads. | Lower cost for non-critical industrial use; lacks hiccup-mode OCP and tighter ref tolerance. |
| MP2451DT-LF-Z | 36 V max input, 2 A, 2 MHz switching, requires external compensation, smaller TSOT23-8 package. | Better suited for compact designs needing higher frequency and lower output capacitance. | Higher BOM count due to external compensation; not pin-compatible - layout redesign required. |
Compared with LM2596S-ADJ and MP2451DT-LF-Z, the CS5172ED8 offers superior thermal robustness in SOIC-8, integrated soft-start control, and guaranteed hiccup-mode protection - making it preferred for automotive and industrial applications where reliability under fault conditions is critical.
Availability
CS5172ED8 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and distributed power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for CS5172ED8 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 power applications.
The CS5172ED8 belongs to ON Semiconductor's Current-Mode Buck Regulator product line, designed specifically for rugged, high-voltage DC-DC conversion in harsh environments where reliability, thermal performance, and integration are essential.
FAQ
What is the maximum recommended input voltage for the CS5172ED8?
The CS5172ED8 has an absolute maximum input voltage rating of 45 V, but its specified operational input range is 4.5 V to 40 V. Operating continuously at 40 V is supported across the full temperature range and meets all electrical specifications in the datasheet. Exceeding 40 V may compromise long-term reliability and is not validated.
Does the CS5172ED8 require an external compensation network?
No, the CS5172ED8 uses internal compensation optimized for standard output capacitor ESR and inductor values. The COMP pin is not accessible externally and must remain unconnected. This eliminates tuning effort and improves design consistency compared to open-loop buck controllers.
Can the CS5172ED8 drive a 2 A load continuously at 40 V input and 5 V output?
Yes, the CS5172ED8 delivers 2 A continuously at 5 V output with 40 V input when mounted on a 2-layer PCB with ≥2 in² of 2-oz copper on the thermal pad side and ambient temperature ≤55 °C. Thermal simulation or testing is recommended for specific board layouts to confirm junction temperature remains below 125 °C.
How does the EN pin function on the CS5172ED8?
The EN pin on the CS5172ED8 is a logic-level enable input: applying ≥2.0 V enables regulation, while ≤0.8 V disables the device and discharges the output through an internal 10 kΩ pulldown. No external pull-up is needed - the pin floats high internally when not driven.
Is the CS5172ED8 compliant with AEC-Q100 for automotive use?
The CS5172ED8 is not officially AEC-Q100 qualified; however, it is rated for –40 °C to +125 °C junction temperature and widely deployed in automotive body electronics where qualification is customer-validated. For AEC-Q100–required applications, ON Semiconductor offers the pin-compatible AEC-Q100–qualified variant CS5172ED8T, which undergoes full stress testing per Grade 1 requirements.
CS5172ED8 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
CS5172ED8 FAQ
1.How can I place an order for CS5172ED8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5172ED8 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 CS5172ED8 reliable?
The price and inventory of CS5172ED8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5172ED8 is usually 5 days.
3.What payment methods are accepted for CS5172ED8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5172ED8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5172ED8?
CS5172ED8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5172ED8 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 CS5172ED8?
For technical support, including CS5172ED8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5172ED8 requirements.
6.How does Aetrix verify that CS5172ED8 is sourced from the original manufacturer or authorized distributors?
All CS5172ED8 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 CS5172ED8 meets industry standards.
7.What is the process for return or replacement of CS5172ED8?
All CS5172ED8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5172ED8, 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 CS5172ED8 part is unused and in its original packaging.
Return procedure for CS5172ED8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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