My Inquiry
My Account
onsemi CS5172GD8G
- Part No.:
- CS5172GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5172GD8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,160
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS5172GD8G 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 1.25 V 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 voltage down to 1.25 V. It is used in industrial power supplies, automotive body electronics, and distributed power regulation.
For engineers reviewing the CS5172GD8G datasheet, pinout, applications, or equivalent options, key selection considerations include input voltage range (3–40 V), output current capability (1.5 A), thermal performance in SOIC-8 package, and compatibility with standard external compensation networks for stability tuning.
Technical Context
The CS5172GD8G 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 switch and uses an external Schottky diode for synchronous rectification replacement.
It features cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO) with 2.5 V turn-on threshold. The error amplifier compares feedback voltage against a precision 1.25 V reference, enabling accurate output regulation under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - Supports wide-range unregulated inputs including automotive battery (9–16 V) and industrial 24 V rails. |
| Output Current | Up to 1.5 A - Sustained continuous load without external heatsink in SOIC-8 at TA ≤ 85°C. |
| Reference Voltage | 1.25 V ±1.5% - Enables precise output setting via resistive divider; low drift ensures tight regulation over temperature. |
| Switching Frequency | Fixed 200 kHz - Balances EMI performance and external component size; allows use of standard low-ESR ceramic output capacitors. |
| UVLO Threshold | 2.5 V (rising), 2.3 V (falling) - Prevents erratic startup during brown-out; provides clean power-up sequencing. |
| Thermal Shutdown | 165°C (typ.), hysteresis 25°C - Protects device during overload or poor PCB thermal design; auto-recovery on cooldown. |
| Soft-Start Time | Internal 5 ms - Limits inrush current during startup; eliminates need for external soft-start capacitor. |
Pinout & Package
SOIC-8 (Surface-Mount, 150 mil width), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input supply (3–40 V); requires local 10 µF ceramic bypass capacitor to ground. |
| GND | Power Ground | Power return path for internal switch and control circuitry; must be low-impedance connection to output capacitor ground. |
| SW | Switch Node | Drain of internal N-MOSFET; connects to external Schottky diode anode and output inductor. |
| FB | Feedback Input | Resistive divider tap point; regulates output by comparing to 1.25 V internal reference. |
| COMP | Compensation Node | Output of error amplifier; connect Type II compensation network (resistor + capacitor + capacitor) for loop stability. |
| EN | Enable Input | Active-high logic input; pulls low to disable regulator and reduce quiescent current to <10 µA. |
| SS | Soft-Start | Internal soft-start node; left unconnected for default 5 ms ramp; optional capacitor extends ramp time. |
| NC | No Connect | Internally unused pin; must remain floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A N-Channel MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity while maintaining >85% efficiency at 12 V → 5 V/1 A. |
| Current-Mode PWM Control | Enables fast transient response and inherent cycle-by-cycle current limiting; simplifies compensation design vs. voltage-mode controllers. |
| Internal 1.25 V Reference | ±1.5% accuracy over –40°C to +125°C enables stable output regulation without trimming; supports adjustable outputs from 1.25 V to VIN–2 V. |
| Thermal Shutdown with Hysteresis | 165°C trip with 25°C hysteresis prevents thermal oscillation during sustained overload; allows safe recovery without manual reset. |
| Enable Pin with Logic-Level Compatibility | Accepts 1.2 V min high-level signal; supports direct interfacing with microcontrollers and sequencers for power rail control. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Local 5 V or 3.3 V rail generation from 24 V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role: Primary buck regulator providing isolated, regulated low-voltage power with high noise immunity. Use Value: Wide 3–40 V input accommodates 24 V nominal with ±25% line variation; 1.5 A output supports multiple digital loads without derating. | Use Scenario: Powering microcontroller, CAN transceiver, and LED drivers in door module or lighting control unit. IC Role / Device Role: Main DC-DC converter converting battery voltage (9–16 V) to stable 5 V system rail. Use Value: UVLO (2.5 V) ensures reliable start-up even during cranking; thermal shutdown protects against enclosure overheating in sealed assemblies. |
| Distributed Point-of-Load Regulation | Legacy Equipment Retrofit |
Use Scenario: Replacing linear regulators in aging instrumentation to improve efficiency and reduce heat sink size. IC Role / Device Role: High-efficiency drop-in buck solution replacing obsolete 78xx series regulators. Use Value: Fixed 200 kHz frequency avoids audible noise; SOIC-8 footprint matches many through-hole TO-220 layouts with adapter board. | Use Scenario: Upgrading power stage in legacy medical device where space and thermal constraints limit redesign scope. IC Role / Device Role: Compact, self-contained buck controller minimizing board real estate and qualification effort. Use Value: Internal soft-start eliminates external timing components; EN pin enables seamless integration into existing enable/control logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-5.0/NOPB | Fixed 5 V output; no adjustable FB pin; 3 A rating but larger SOIC-8 footprint with different pinout. | Suitable only for fixed 5 V designs; lacks EN and SS pins; higher quiescent current (5 mA vs. 2.5 mA). | Select when fixed 5 V output suffices and board layout allows mechanical adaptation. |
| MP1584EN-LF-Z | Adjustable output (1.23 V ref), 3 A rating, 1.5 MHz switching; requires external bootstrap capacitor. | Better suited for compact designs needing higher current or smaller inductors; less tolerant of high input voltage transients (max VIN = 28 V). | Prefer for space-constrained 12 V input systems requiring >1.5 A; avoid in 24/40 V industrial environments. |
Compared with LM2596SX-5.0/NOPB and MP1584EN-LF-Z, the CS5172GD8G offers optimal balance of wide-input capability (up to 40 V), integrated enable/soft-start, and SOIC-8 compatibility-making it uniquely suitable for industrial and automotive retrofit where input voltage margin and control flexibility are critical.
Availability
CS5172GD8G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and distributed power supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CS5172GD8G 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 infrastructure markets.
The CS5172GD8G belongs to ON Semiconductor's NCP/CS series of monolithic DC-DC regulators, designed specifically for rugged, high-reliability power conversion in harsh environments with wide input voltage ranges and robust protection features.
FAQ
What is the maximum input voltage rating for the CS5172GD8G?
The CS5172GD8G has an absolute maximum input voltage rating of 45 V, with recommended continuous operation up to 40 V. Exceeding 40 V may trigger internal overvoltage protection or reduce reliability; transient spikes must be clamped externally using TVS diodes rated for automotive load-dump conditions (e.g., ISO 7637-2 Pulse 5a).
Can the CS5172GD8G be used to generate a 3.3 V output?
Yes, the CS5172GD8G can generate a stable 3.3 V output using a resistive feedback divider connected to the FB pin. With its 1.25 V internal reference, a standard 2.05 kΩ (top) and 1.24 kΩ (bottom) resistor combination achieves 3.3 V ±1% under typical conditions, and the COMP pin allows full compensation for stability across load and temperature.
Does the CS5172GD8G require an external Schottky diode?
Yes, the CS5172GD8G requires an external Schottky diode connected between the SW pin and output. It does not integrate a synchronous rectifier; the diode completes the buck converter's freewheeling path. A 40 V, 2 A Schottky (e.g., MBR240) is recommended to minimize conduction loss and maintain efficiency above 85% at full load.
How does the EN pin function on the CS5172GD8G?
The EN pin on the CS5172GD8G is an active-high enable input. Pulling EN ≥1.2 V enables regulation; pulling EN <0.4 V disables the IC, reducing quiescent current to under 10 µA. It is TTL- and CMOS-compatible and supports direct connection to microcontroller GPIOs or open-drain sequencer outputs without level-shifting.
Is thermal derating required for the CS5172GD8G in SOIC-8 package?
Yes, thermal derating is required. At ambient temperatures above 85°C, the CS5172GD8G's 1.5 A output current rating must be reduced per its thermal resistance (θJA = 120°C/W). With 2 cm² of 2-oz copper pour and two thermal vias, full 1.5 A is sustainable up to ~70°C ambient; above that, linear derating applies until thermal shutdown activates at junction temperature ≥165°C.
CS5172GD8G 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:
- 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):
- -2.45V
- Voltage - Output (Max):
- -40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5172GD8G FAQ
1.How can I place an order for CS5172GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5172GD8G 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 CS5172GD8G reliable?
The price and inventory of CS5172GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5172GD8G is usually 5 days.
3.What payment methods are accepted for CS5172GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5172GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5172GD8G?
CS5172GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5172GD8G 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 CS5172GD8G?
For technical support, including CS5172GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5172GD8G requirements.
6.How does Aetrix verify that CS5172GD8G is sourced from the original manufacturer or authorized distributors?
All CS5172GD8G 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 CS5172GD8G meets industry standards.
7.What is the process for return or replacement of CS5172GD8G?
All CS5172GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5172GD8G, 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 CS5172GD8G part is unused and in its original packaging.
Return procedure for CS5172GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS5172GD8G Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
