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onsemi CS5173GD8
- Part No.:
- CS5173GD8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5173GD8.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
CS5173GD8 from ON Semiconductor is a high-efficiency, current-mode DC-DC step-down (buck) switching regulator IC with integrated 1.5 A MOSFET switch, fixed 1.23 V feedback reference, and internal soft-start. It operates from 3.0 V to 40 V input, delivers up to 1.5 A output current, and supports adjustable output voltages down to 1.23 V - used in industrial power supplies, automotive body electronics, and distributed point-of-load regulation.
For engineers reviewing the CS5173GD8 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 continuity.
Technical Context
The CS5173GD8 employs a current-mode PWM control architecture with internal slope compensation to ensure stable operation across wide duty-cycle ranges. It integrates a high-side N-channel MOSFET with typical RDS(on) of 220 mΩ and uses external timing components to set switching frequency between 100 kHz and 500 kHz.
It features cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (UVLO) with 2.5 V turn-on threshold, and an internal soft-start ramp that limits inrush current during startup. The feedback loop accepts voltage divider inputs referenced to the 1.23 V internal bandgap reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Output Current Capability | Up to 1.5 A continuous - enables direct powering of microcontrollers, sensors, and interface ICs without external pass devices. |
| Feedback Reference Voltage | 1.23 V ±1.5% - sets precise output regulation via external resistor divider; tolerance directly impacts output accuracy. |
| Switching Frequency Range | 100 kHz to 500 kHz - adjustable via external RT resistor; higher frequencies reduce output filter size but increase switching losses. |
| Internal Soft-Start Time | Approximately 4 ms - prevents input surge current and output overshoot during power-up; not user-adjustable. |
| Thermal Shutdown Threshold | 165 °C (typical) - protects device under overload or poor heatsinking; auto-recovery after cooldown. |
| UVLO Turn-On Threshold | 2.5 V (rising) - ensures reliable startup only when input rail is sufficiently established. |
Pinout & Package
CS5173GD8 is housed in an 8-pin SOIC package (SOIC-8, 150 mil width) with exposed thermal pad (D8 suffix per ON Semiconductor nomenclature). Pin 1 is marked by a dot or notch orientation indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection (3.0–40 V); requires local ceramic bypass capacitor (≥1 µF) near pin. |
| GND | Ground Reference | Analog and power ground return; must be connected to low-impedance PCB ground plane beneath thermal pad. |
| SW | Switch Node | Drain of internal high-side MOSFET; connects to external inductor and catch diode/anode; high dv/dt node requiring tight layout. |
| FB | Feedback Input | Inverting input of error amplifier; connected to resistor divider from output to set regulated voltage (VOUT = 1.23 V × (1 + R1/R2)). |
| COMP | Compensation Node | Output of error amplifier; connects to Type II compensation network (RC + C) for loop stability. |
| EN | Enable Control | Active-high logic input; pulls below 0.4 V to disable regulator and reduce quiescent current to <10 µA. |
| SS | Soft-Start Capacitor | Connects external capacitor (typically 1–10 nF) to set soft-start ramp time; open-circuit disables soft-start. |
| PGND | Power Ground | Dedicated power ground terminal tied internally to MOSFET source; must be routed separately to GND plane under thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A High-Side MOSFET | Eliminates need for external switch and driver; reduces BOM count and layout complexity in space-constrained designs. |
| Wide 3.0–40 V Input Range | Directly interfaces with 12 V/24 V automotive and industrial rails, including cold-crank (6.5 V) and load-dump (40 V) transients. |
| Current-Mode PWM Control | Provides inherent cycle-by-cycle overcurrent protection and simplifies loop compensation versus voltage-mode controllers. |
| Adjustable Switching Frequency (100–500 kHz) | Enables optimization of efficiency vs. size trade-off: lower frequencies improve light-load efficiency; higher frequencies shrink magnetics. |
| Internal Soft-Start (4 ms) | Prevents output overshoot and input capacitor stress during startup - no external component required unless longer ramp needed. |
| Thermal Shutdown with Hysteresis | Protects against sustained overload or inadequate heatsinking; resumes operation automatically after die temperature drops ~15 °C below trip point. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering isolated digital I/O channels, analog sensor front-ends, and CAN transceivers within a DIN-rail mounted programmable logic controller. IC Role / Device Role: Primary 5 V or 3.3 V buck regulator supplying downstream LDOs and signal conditioning circuitry. Use Value: Wide VIN range accommodates unregulated 24 V DC field bus; 1.5 A output supports multiple parallel loads; SOIC-8 package allows compact board area. |
Use Scenario: Generating 5 V for microcontroller, LIN transceivers, LED drivers, and window motor control logic in vehicle door modules. IC Role / Device Role: Main system power supply converting battery voltage (9–16 V nominal, up to 40 V during load dump) to stable 5 V rail. Use Value: Built-in UVLO and thermal protection meet automotive reliability requirements; EN pin enables sleep-mode current reduction. |
| Point-of-Load Converter for FPGA Core | Smart Sensor Node Power Supply |
|
Use Scenario: Providing clean, regulated 1.2 V core voltage to low-power FPGA or ASIC in edge computing gateways. IC Role / Device Role: Pre-regulator stepping down intermediate 5 V or 12 V rail to 1.2 V before final LDO filtering. Use Value: Adjustable output via FB divider enables exact core voltage setting; current-mode control ensures fast transient response to logic switching currents. |
Use Scenario: Powering ultra-low-power MCU, MEMS accelerometer, BLE radio, and environmental sensors in battery-operated IoT nodes. IC Role / Device Role: Efficient primary DC-DC converter extending battery life while maintaining stable 3.3 V supply across discharge curve. Use Value: Low quiescent current in shutdown (<10 µA) preserves battery; EN pin synchronizes with MCU wake/sleep cycles. |
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 FB pin; 5 A output capability; larger TO-220-7 package. | Suitable only where fixed 5 V is acceptable; higher current rating adds margin but increases cost and footprint. | Select if fixed 5 V output suffices and higher current headroom is needed; avoid if adjustable output or SOIC-8 footprint is required. |
| MP2451DT-LF-Z | 3.3 V to 36 V input; 0.6 A output; 2 MHz fixed frequency; smaller TSOT23-6 package; no SS pin. | Better suited for low-current, high-frequency, space-constrained designs; lacks soft-start and enable control. | Choose for compact, low-IQ applications under 0.6 A; not suitable as drop-in replacement due to lower current and missing EN/SS functionality. |
Compared with LM2678-5.0/NOPB and MP2451DT-LF-Z, the CS5173GD8 uniquely balances adjustable output, 1.5 A capability, SOIC-8 footprint, and full feature set (EN, SS, COMP) - making it optimal for mid-power industrial and automotive point-of-load designs requiring flexibility and reliability.
Availability
CS5173GD8 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and smart sensor applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CS5173GD8 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CS5173GD8 belongs to ON Semiconductor's Current-Mode Buck Regulator product line, designed specifically for robust, high-voltage DC-DC conversion in harsh environments where input transients and thermal reliability are critical.
FAQ
What is the maximum recommended output current for CS5173GD8 under continuous operation?
The CS5173GD8 is rated for up to 1.5 A continuous output current under typical PCB layout conditions with adequate copper area on the thermal pad. Derating is required above ambient temperatures of 70 °C or with insufficient heatsinking; full 1.5 A is achievable at TA ≤ 50 °C with 2 oz copper and 2 cm² thermal pad exposure.
Can CS5173GD8 operate with an input voltage as low as 3.0 V, and what is the minimum dropout behavior?
Yes, CS5173GD8 supports input voltages down to 3.0 V. It does not operate in linear dropout mode; instead, it ceases switching when VIN falls below the UVLO threshold (~2.5 V rising), entering shutdown. Below ~3.5 V, duty cycle approaches 100%, and regulation degrades due to internal MOSFET RDS(on) and diode forward drop in asynchronous configurations.
How is the switching frequency set on CS5173GD8, and what is the valid resistor range for RT?
Switching frequency is set using an external resistor (RT) between the RT pin and GND. Frequency scales inversely with RT value: fSW ≈ 1.1×10⁶ / RT(Ω) kHz. Valid RT range is 2.2 kΩ (500 kHz) to 11 kΩ (100 kHz); values outside this range risk instability or excessive jitter. A 4.7 kΩ resistor yields ~235 kHz.
Does CS5173GD8 require an external catch diode, and what specifications should it meet?
Yes, CS5173GD8 requires an external Schottky catch diode connected from SW to PGND. Recommended diodes include 1N5819 (1 A, 40 V) or MBR0520L (0.5 A, 20 V). Key specs: average current ≥ 1.5 A, peak repetitive reverse voltage ≥ 45 V, forward voltage ≤ 0.5 V at 1.5 A, and fast recovery (<100 ns).
What is the purpose of the COMP pin on CS5173GD8, and how is it typically configured?
COMP is the error amplifier output used for loop compensation. It is connected to a Type II network: series RC (e.g., 10 kΩ + 100 pF) from COMP to FB, plus a capacitor (e.g., 1 nF) from FB to GND. This configuration stabilizes the control loop across load and line variations; incorrect values cause oscillation or slow transient response.
CS5173GD8 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5173GD8 FAQ
1.How can I place an order for CS5173GD8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5173GD8 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 CS5173GD8 reliable?
The price and inventory of CS5173GD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5173GD8 is usually 5 days.
3.What payment methods are accepted for CS5173GD8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5173GD8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5173GD8?
CS5173GD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5173GD8 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 CS5173GD8?
For technical support, including CS5173GD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5173GD8 requirements.
6.How does Aetrix verify that CS5173GD8 is sourced from the original manufacturer or authorized distributors?
All CS5173GD8 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 CS5173GD8 meets industry standards.
7.What is the process for return or replacement of CS5173GD8?
All CS5173GD8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5173GD8, 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 CS5173GD8 part is unused and in its original packaging.
Return procedure for CS5173GD8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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