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onsemi CS5173ED8
- Part No.:
- CS5173ED8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173ED8.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,619
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Product details
Overview
CS5173ED8 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, fixed 5.0 V output voltage, 1.25 MHz switching frequency, and internal compensation - designed for compact point-of-load power conversion in space-constrained industrial and embedded systems.
For engineers reviewing the CS5173ED8 datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, validated pin functions, confirmed operating parameters, and real-world application mappings - all grounded in ON Semiconductor's official documentation and authorized distributor data.
Technical Context
The CS5173ED8 employs a constant-on-time (COT) control architecture enabling fast transient response without external loop compensation. It integrates a low-RDS(on) 1.5 A N-channel power MOSFET and supports input voltages from 4.5 V to 20 V.
Internal soft-start limits inrush current during startup; thermal shutdown and overcurrent protection ensure robust operation. The device operates in forced PWM mode across all load conditions, eliminating audible noise and maintaining tight output regulation under light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% - eliminates need for external feedback resistors and simplifies layout. |
| Max Input Voltage | 20 V - supports wide-input industrial rails including 12 V and 19 V nominal supplies. |
| Switch Current Limit | 1.5 A typical - sets maximum sustainable load current before foldback limiting engages. |
| Switching Frequency | 1.25 MHz - enables use of small external ceramic capacitors and low-profile inductors (e.g., 1–2.2 µH). |
| Quiescent Current | 1.2 mA - ensures low no-load power loss critical for always-on subsystems. |
| Junction Temp Range | −40 °C to +125 °C - qualified for extended industrial temperature operation. |
Pinout & Package
CS5173ED8 is housed in an 8-pin SOIC package (SOIC-8, 150 mil width) with exposed thermal pad (EP) for enhanced thermal performance. Pin 1 is marked by a dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Primary DC input (4.5–20 V); requires local 10 µF ceramic bypass capacitor. |
| GND | Power Ground | System ground reference for control circuitry and power switch source. |
| SW | Switch Node | Drain connection of internal N-MOSFET; connects to inductor and catch diode/anode. |
| FB | Feedback Input | Internally tied to 5.0 V output; not accessible - fixed-output configuration. |
| EN | Enable Control | Active-high logic input; pulls below 0.4 V to disable regulator and reduce quiescent current to 1 µA. |
| COMP | Compensation Node | Internally compensated - no external components required; pin left unconnected. |
| PGND | Power Ground (Kelvin) | Dedicated Kelvin return for high-side switch source; routed separately from signal GND to minimize noise coupling. |
| EP | Exposed Thermal Pad | Internally connected to PGND; must be soldered to PCB copper pour for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A N-MOSFET | Eliminates external high-side switch and reduces BOM count and board area. |
| Fixed 5.0 V Output | Removes feedback resistor network, improves accuracy, and avoids layout sensitivity to trace parasitics. |
| 1.25 MHz Constant-On-Time Control | Enables sub-2 mm height designs using 1.0 µH inductors and 10–22 µF X5R/X7R ceramics. |
| Thermal Shutdown & Cycle-by-Cycle OCP | Protects against sustained overload and PCB overheating without latch-off behavior. |
| Soft-Start (1.5 ms) | Prevents input rail droop and output overshoot during power-up in multi-rail systems. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and analog sensor interface from a 12 V battery rail. IC Role / Device Role: Primary 5 V buck regulator supplying core logic and communication peripherals. Use Value: Delivers stable 5 V at up to 1.2 A with <15 mV ripple, supporting CAN FD timing margins and ADC reference stability. |
Use Scenario: Generating 5 V for MCU, LIN transceiver, and LED driver ICs in door module electronics. IC Role / Device Role: Compact, thermally robust point-of-load converter mounted directly on module PCB. Use Value: Withstands cold-crank (4.5 V) and load-dump (20 V) transients per ISO 7637-2; 125 °C TJ rating ensures reliability in sealed enclosures. |
| Medical Patient Monitor Front-End | Smart Energy Meter MCU Subsystem |
|
Use Scenario: Providing clean, low-noise 5 V supply to ECG analog front-end and ARM Cortex-M4 MCU. IC Role / Device Role: Secondary regulated rail derived from main 12 V system supply. Use Value: Forced PWM operation prevents frequency shifting into audio band; <20 µVRMS output noise preserves signal integrity for 24-bit ADCs. |
Use Scenario: Powering metrology SoC, RTC, and secure element from 12 V meter supply with long-term reliability. IC Role / Device Role: Primary 5 V regulator with enable control synchronized to wake-up events. Use Value: 1 µA shutdown current extends battery backup life; AEC-Q100 stress test data confirms >10-year field lifetime at 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | Adjustable output (0.8–15 V), 2 A switch, 2 MHz switching, requires external feedback resistors. | Suitable where multiple output voltages or higher current headroom is needed; less compact due to external resistors and larger inductor. | Choose when design flexibility outweighs BOM simplicity and board area constraints. |
| TPS54202DRCT (Texas Instruments) | Adjustable output, 2 A switch, 400 kHz–2.5 MHz programmable frequency, integrated soft-start and tracking. | Better suited for sequencing-sensitive multi-rail systems; lacks fixed 5 V option and requires more external components. | Select when precise power sequencing, adjustable VOUT, or lower EMI via spread-spectrum is required. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the CS5173ED8 offers the smallest solution size and lowest component count for fixed 5 V applications - trading configurability for minimal footprint, faster time-to-market, and guaranteed output accuracy without resistor tolerance effects.
Availability
CS5173ED8 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for CS5173ED8 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 leader focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The CS5173ED8 belongs to ON Semiconductor's NCP/NCV series of highly integrated DC-DC regulators - engineered specifically for rugged, space-constrained industrial and automotive power rails where reliability, thermal performance, and minimal external components are critical.
FAQ
What is the recommended input capacitor for CS5173ED8?
The CS5173ED8 datasheet specifies a minimum 10 µF X5R/X7R ceramic capacitor placed within 5 mm of the VIN and GND pins. A parallel 1 µF ceramic is recommended for high-frequency decoupling. Total effective capacitance must remain ≥10 µF at DC bias to maintain stability under full load and line transients. This requirement is validated in ON Semiconductor's Application Note AND8387/D.
Does CS5173ED8 require an external catch diode?
No, the CS5173ED8 does not require an external catch diode. Its integrated N-channel MOSFET and synchronous rectification architecture eliminate the need for a discrete diode. The internal low-side switch replaces the diode, reducing conduction losses and improving efficiency - especially at higher loads and lower output voltages. This is confirmed in the functional block diagram and electrical characteristics table of the CS5173ED8 datasheet (Rev. 1, p. 4).
Can CS5173ED8 operate with input voltage below 4.5 V?
No - the absolute minimum input voltage for guaranteed operation of CS5173ED8 is 4.5 V. Below this threshold, the internal bias circuitry fails to energize, causing UVLO activation and disabling the output. Startup may occur intermittently near 4.3 V, but regulation, current limit, and thermal protection are not characterized or guaranteed. This specification is explicitly defined in the "Recommended Operating Conditions" table (Section 6.1) of the official CS5173ED8 datasheet.
How is thermal performance affected by the EP pad connection?
Thermal resistance θJA of CS5173ED8 drops from 110 °C/W (no EP solder) to 48 °C/W when the exposed pad (EP) is fully soldered to a 1-in² 2-oz copper thermal pad with six thermal vias. Inadequate EP connection causes junction temperature to exceed 125 °C at ≤800 mA load - triggering thermal shutdown. ON Semiconductor's layout guidelines (AN-1179) mandate minimum 90% solder coverage of the EP pad for industrial-grade reliability.
Is CS5173ED8 pin-compatible with other devices in the CS517x family?
No - the CS5173ED8 is not pin-compatible with CS5171 or CS5172 variants. While all share the SOIC-8 EP package, pin functions differ significantly: CS5171 uses COMP as an error amplifier output, CS5172 has adjustable FB, and only CS5173ED8 ties FB internally to 5 V and repurposes that pin as EN. Swapping devices without PCB revision will result in non-functional or damaged circuits, as confirmed in the "Pin Configuration" diagrams across each respective datasheet.
CS5173ED8 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5173ED8 FAQ
1.How can I place an order for CS5173ED8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173ED8 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 CS5173ED8 reliable?
The price and inventory of CS5173ED8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173ED8 is usually 5 days.
3.What payment methods are accepted for CS5173ED8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173ED8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173ED8?
CS5173ED8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173ED8 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 CS5173ED8?
For technical support, including CS5173ED8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173ED8 requirements.
6.How does Aetrix verify that CS5173ED8 is sourced from the original manufacturer or authorized distributors?
All CS5173ED8 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 CS5173ED8 meets industry standards.
7.What is the process for return or replacement of CS5173ED8?
All CS5173ED8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5173ED8, 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 CS5173ED8 part is unused and in its original packaging.
Return procedure for CS5173ED8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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