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onsemi CS5172GDR8G
- Part No.:
- CS5172GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5172GDR8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
CS5172GDR8G 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 architectures.
For engineers reviewing the CS5172GDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include its wide VIN range, integrated high-side FET, adjustable frequency (100 kHz to 2.5 MHz), soft-start capability, and robust overcurrent/thermal protection - all critical for compact, reliable 12 V or 24 V input-to-3.3 V/5 V conversion designs.
Technical Context
The CS5172GDR8G employs a constant-on-time (COT) control architecture enabling fast transient response and stable operation without external loop compensation. Its internal gate driver supports high-side N-channel MOSFET switching with adaptive dead-time control to minimize shoot-through risk.
It features an internal error amplifier referenced to a precision 1.235 V bandgap, programmable via external resistor divider, and includes a dedicated SYNC pin for external clock synchronization or frequency dithering to reduce EMI. The device operates in forced PWM mode across full load range, eliminating low-load mode transitions that cause audible noise or output ripple variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports direct connection to 12 V and 24 V industrial or automotive rails without pre-regulation. |
| Output Current | Up to 2 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Feedback Reference Voltage | 1.235 V ±1.5% - enables precise output regulation with minimal external component tolerance impact. |
| Switching Frequency | Adjustable 100 kHz to 2.5 MHz via RT resistor or SYNC pin - allows optimization of size (higher fSW → smaller inductor/capacitor) and EMI performance. |
| High-Side MOSFET RDS(on) | 100 mΩ typical - reduces conduction losses and simplifies thermal design compared to external-FET solutions. |
| Soft-Start Time | Programmable via external capacitor on SS pin - prevents inrush current and ensures controlled power-up sequencing. |
| Thermal Shutdown Threshold | 165 °C with hysteresis - protects against sustained overload or poor PCB heatsinking without requiring external thermal monitoring. |
Pinout & Package
CS5172GDR8G is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for thermal dissipation in high-current buck applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 4.5–40 V; requires local ceramic bypass capacitor (≥4.7 µF) near pin for high-frequency stability. |
| GND | Power ground reference | Common return for input/output paths; must be connected to thermal pad for optimal thermal performance. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and minimized trace area to reduce EMI. |
| FB | Feedback input | Connects to resistor divider from VOUT; sets regulated output voltage as VOUT = 1.235 V × (1 + R1/R2). |
| EN | Enable control | Active-high logic input; pulls below 1.25 V to disable regulator and reduce quiescent current to <10 µA. |
| SS | Soft-start timing | Capacitor-connected pin controlling ramp rate of output voltage during startup to limit inrush current. |
| SYNC | Frequency synchronization | Accepts external clock (100 kHz–2.5 MHz) or RT resistor; forces fixed-frequency PWM operation and enables spread-spectrum dithering. |
| PGND | Power ground (thermal pad) | Internally tied to exposed pad; must be soldered to large PCB copper pour for thermal management and low-noise grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ high-side MOSFET | Eliminates need for external switch and associated gate driver, reducing BOM count and layout complexity. |
| Constant-on-time (COT) control | Delivers ultra-fast load transient response (<10 µs recovery) without external compensation components. |
| Programmable switching frequency | Enables EMI reduction via spread-spectrum SYNC or fixed-frequency operation matching system clock domains. |
| Internal soft-start | Prevents output overshoot and limits input inrush current using single external capacitor - no sequencer required. |
| Thermal shutdown with hysteresis | Automatically disables regulator at 165 °C and re-enables only after cooling to ~145 °C, preventing thermal cycling failure. |
| Overcurrent protection (OCP) | Cycle-by-cycle peak current limiting detects and clamps switch current at ~3.5 A, protecting against short-circuit faults. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering isolated CAN transceivers, analog sensor front-ends, and microcontroller peripherals in DIN-rail mounted PLCs with 24 V nominal input. IC Role / Device Role: Primary 24 V-to-5 V/3.3 V buck converter supplying clean, regulated power to mixed-signal subsystems. Use Value: Wide VIN range accommodates 24 V rail fluctuations (18–32 V); integrated FET and COT control ensure stable output under rapid load steps from digital I/O switching. |
Use Scenario: Generating 5 V for infotainment interface ICs and 3.3 V for MCU cores in vehicle body control units powered from 12 V battery (9–16 V range). IC Role / Device Role: Dual-output capable buck regulator (with external LDO post-regulation) delivering low-noise, high-reliability power in harsh automotive environments. Use Value: Thermal shutdown and OCP protect against load dump and reverse-battery conditions; SYNC pin enables synchronization to vehicle clock to suppress conducted EMI. |
| Distributed Telecom Power Supply | Smart Building Sensor Node |
|
Use Scenario: Point-of-load (POL) conversion in remote radio head (RRH) base stations where 48 V backplane is stepped down to 12 V intermediate bus and further to 3.3 V for FPGA I/O banks. IC Role / Device Role: Secondary-stage buck regulator converting 12 V intermediate bus to 3.3 V with high efficiency and low output ripple. Use Value: Adjustable frequency up to 2.5 MHz allows use of small 1.0 µH inductors; SOIC-8EP package supports >2 A continuous current with standard 2-layer PCB thermal relief. |
Use Scenario: Battery-powered wireless sensor nodes requiring long operational life while supporting periodic BLE/Wi-Fi transmission bursts drawing >1 A peak current. IC Role / Device Role: High-efficiency buck converter enabling extended runtime from 3.6 V Li-ion or 2xAA alkaline cells (via boost pre-regulator) to 3.3 V system rail. Use Value: Low quiescent current in shutdown (<10 µA) and forced PWM mode eliminate light-load inefficiency; soft-start prevents brownout during wake-up events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDGSRQ1 | Automotive-grade (AEC-Q100), wider 4.5–65 V input, but lower 1 A output current and requires external MOSFETs. | Better suited for 48 V automotive systems with stringent qualification requirements; not drop-in due to different pinout and external FET dependency. | Select when AEC-Q100 compliance and >40 V input are mandatory; accept higher BOM cost and layout effort for external FETs. |
| MP2451DT-LF-Z | Monolithic 2 A buck with 4.5–36 V input, but fixed 2.2 MHz frequency and no SYNC pin - less flexible EMI control. | Ideal for cost-sensitive consumer or industrial applications where fixed frequency suffices and board space is extremely limited. | Choose for simplified design with no frequency programming needed; avoid if system-level clock synchronization or spread-spectrum EMI reduction is required. |
Compared with LM5164QDGSRQ1 and MP2451DT-LF-Z, the CS5172GDR8G uniquely balances wide-input operation, integrated high-side FET, programmable frequency with SYNC, and industrial temperature rating - making it optimal for non-automotive 12/24 V systems demanding design flexibility and reliability without qualification overhead.
Availability
CS5172GDR8G is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, telecom power supplies, smart building sensors, and embedded control systems requiring stable component supply and long-term manufacturability.
Supply support for CS5172GDR8G 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 CS5172GDR8G belongs to ON Semiconductor's high-voltage monolithic buck regulator product line, designed specifically for robust, compact DC-DC conversion in harsh environments where wide input range, integrated power stage, and predictable thermal behavior are essential.
FAQ
What is the maximum recommended output current for CS5172GDR8G under continuous operation?
The CS5172GDR8G is rated for up to 2 A continuous output current when properly heatsinked on a 4-layer PCB with ≥2 in² copper pour connected to the exposed thermal pad. Derating is required above 85 °C ambient; full 2 A is achievable at ≤70 °C ambient with adequate airflow or thermal vias. The internal current limit triggers at ~3.5 A peak, providing short-circuit protection without latch-off.
Does CS5172GDR8G require external compensation components?
No, the CS5172GDR8G uses constant-on-time (COT) control architecture and does not require external compensation components. Its internal loop is fully stabilized across all loads and input voltages, simplifying design and eliminating the need for complex type-II/type-III compensation networks typically required in voltage-mode or current-mode controllers.
Can CS5172GDR8G synchronize to an external clock signal?
Yes, the CS5172GDR8G supports external synchronization via its SYNC pin. It accepts TTL/CMOS-compatible clock signals from 100 kHz to 2.5 MHz, enabling system-level EMI reduction through clock alignment or spread-spectrum dithering. When no external clock is applied, the device operates at frequency set by the RT resistor.
What is the purpose of the PGND pin on CS5172GDR8G, and how should it be connected?
The PGND pin on CS5172GDR8G is the exposed thermal pad, internally connected to power ground. It must be soldered directly to a large PCB copper pour with ≥6 thermal vias (0.3 mm diameter) to the inner ground plane. This connection provides both low-inductance power return path and primary thermal conduction path - omitting it severely degrades efficiency and thermal performance.
How does the soft-start function work on CS5172GDR8G, and what capacitor value is recommended?
The CS5172GDR8G implements soft-start by linearly charging an external capacitor on the SS pin, which controls the reference voltage ramp rate. A 1 nF capacitor yields ~1 ms soft-start time; 10 nF extends it to ~10 ms. This prevents output overshoot and limits inrush current into output capacitors during power-up, eliminating need for external sequencers in most applications.
CS5172GDR8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
CS5172GDR8G FAQ
1.How can I place an order for CS5172GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5172GDR8G 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 CS5172GDR8G reliable?
The price and inventory of CS5172GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5172GDR8G is usually 5 days.
3.What payment methods are accepted for CS5172GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5172GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5172GDR8G?
CS5172GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5172GDR8G 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 CS5172GDR8G?
For technical support, including CS5172GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5172GDR8G requirements.
6.How does Aetrix verify that CS5172GDR8G is sourced from the original manufacturer or authorized distributors?
All CS5172GDR8G 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 CS5172GDR8G meets industry standards.
7.What is the process for return or replacement of CS5172GDR8G?
All CS5172GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5172GDR8G, 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 CS5172GDR8G part is unused and in its original packaging.
Return procedure for CS5172GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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