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onsemi CS5171GDR8G
- Part No.:
- CS5171GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5171GDR8G.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
CS5171GDR8G from ON Semiconductor is a monolithic step-up DC-DC switching regulator IC with integrated 1.5 A N-channel MOSFET switch, fixed 100 kHz switching frequency, and internal current-mode PWM control. It operates from 2.7 V to 30 V input, delivers up to 1.5 A output current, and supports output voltages up to 40 V - commonly used in battery-powered LED drivers, portable instrumentation power supplies, and industrial sensor biasing.
For engineers reviewing the CS5171GDR8G datasheet, pinout, applications, or equivalent options, key selection considerations include its wide input voltage range (2.7–30 V), integrated high-current switch, fixed-frequency current-mode operation for stable loop response, and thermal shutdown protection - all critical for compact, high-efficiency boost converter designs in space-constrained embedded systems.
Technical Context
The CS5171GDR8G implements a current-mode PWM controller with an internal 1.5 A, 75 mΩ N-channel MOSFET switch and a precision 1.25 V reference. Its oscillator runs at a fixed 100 kHz frequency, enabling predictable EMI behavior and simplified external component selection.
It features cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO) with 2.5 V turn-on threshold. The feedback pin accepts a resistive divider to set output voltage, and the device requires no external compensation due to its internally optimized control loop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Step-up (boost) DC-DC converter - enables output voltage higher than input, essential for LED string driving and sensor bias rails. |
| Switch Current Rating | 1.5 A continuous - supports medium-power loads without external switch, reducing BOM count and layout area. |
| Input Voltage Range | 2.7 V to 30 V - accommodates single-cell Li-ion (2.7–4.2 V), multi-cell alkaline, or industrial 24 V supply rails. |
| Output Voltage Range | Up to 40 V - sufficient for driving 10+ white LEDs in series or powering analog front-ends requiring >15 V bias. |
| Switching Frequency | 100 kHz fixed - simplifies EMI filtering design and allows use of low-cost, high-inductance power inductors. |
| Reference Voltage | 1.25 V ±1.5% - enables precise output regulation via standard resistor divider; tolerance directly impacts output accuracy. |
| UVLO Threshold | 2.5 V (rising), 2.3 V (falling) - prevents erratic startup during brown-out and ensures clean power-up sequencing. |
Pinout & Package
CS5171GDR8G is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for thermal dissipation in high-current boost applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.7–30 V DC; must be bypassed with ≥10 µF ceramic capacitor close to pin for stability and transient response. |
| GND | Power ground | Common return for input/output paths and IC substrate; connects to thermal pad for heat sinking. |
| SW | Switch node | Drives external inductor; carries high di/dt square wave - requires short, low-inductance routing to minimize EMI. |
| FB | Feedback input | Monitors output via resistive divider; 1.25 V reference sets regulation point - determines output voltage accuracy. |
| COMP | Compensation node | Internal error amplifier output; left unconnected - no external compensation required. |
| SD | Shutdown control | Logic-level input: <0.4 V = disable (low quiescent current), >2.0 V = enable - enables system-level power sequencing. |
| NC | No connect | Pin 7 is internally unused; must remain floating or tied to GND per layout guidelines to avoid noise coupling. |
| EP | Exposed thermal pad | Internally connected to GND; soldered to PCB copper pour for thermal conduction - critical for 1.5 A operation reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A, 75 mΩ N-channel MOSFET | Eliminates need for external switch, reduces solution size by >30%, and improves efficiency over discrete implementations at ≤1 A load. |
| Fixed 100 kHz current-mode PWM control | Provides inherent loop stability, fast transient response, and consistent EMI profile - avoids frequency jitter or external oscillator tuning. |
| Thermal shutdown with hysteresis | Activates at +165 °C, resets at +145 °C - protects against sustained overload or poor heatsinking without latch-up. |
| Undervoltage lockout (UVLO) | Ensures reliable start-up only above 2.5 V and prevents oscillation during input sag - critical for battery-fed systems. |
| Logic-compatible shutdown pin (SD) | Supports microcontroller-controlled power gating with <1 µA standby current - enables low-power sleep modes in portable devices. |
Applications
| LED Backlighting | Portable Instrumentation Power |
|---|---|
|
Use Scenario: Driving 6–12 white LEDs in series from a single Li-ion cell (3.0–4.2 V). IC Role / Device Role: Primary boost controller providing regulated constant-current output via external sense resistor and feedback configuration. Use Value: Delivers stable 30–36 V output at up to 1.2 A with <±2% output regulation, enabling uniform brightness across display backlight arrays. |
Use Scenario: Generating +15 V and –5 V rails for op-amp signal conditioning circuits in handheld test equipment. IC Role / Device Role: Positive boost stage feeding an inverting buck-boost stage; provides isolated, low-noise positive bias rail. Use Value: Fixed 100 kHz switching enables predictable filter design; 1.5 A capability supports peak loads during ADC sampling bursts. |
| Industrial Sensor Bias Supply | Automotive Aftermarket Camera Module |
|
Use Scenario: Powering 24 V analog sensors (e.g., pressure transducers) from a 12 V vehicle bus with load dump immunity. IC Role / Device Role: Pre-regulator boosting 12 V to 24 V before LDO post-regulation - improves PSRR and thermal margin. Use Value: Wide 2.7–30 V input range tolerates cold-crank (6.5 V) and load-dump (40 V transient clamped) conditions without dropout. |
Use Scenario: Providing 28 V VCC to CMOS image sensor and 5 V logic rail via secondary LDO in rear-view camera modules. IC Role / Device Role: Primary DC-DC boost converter operating from automotive 9–16 V nominal supply. Use Value: Integrated MOSFET and thermal pad support 85 °C ambient operation; shutdown pin enables CAN-triggered power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27313XSD/NOPB | 3 MHz switching frequency, 0.8 A switch, smaller 6-pin SOT-23 package | Better suited for ultra-compact, low-current (<0.6 A) applications where board space is critical but thermal headroom is limited | Choose when footprint and light-load efficiency outweigh peak current and thermal robustness requirements |
| TPS61088RHLR | 2.7–12 V input, 10-A switch, 2.5–20 V output, adjustable frequency (200 kHz–2.2 MHz) | Targeted at high-current, wide-output-range applications (e.g., USB PD sink, SSD power); lacks 30 V input capability | Prefer when >2 A output current or programmable frequency is required - not drop-in due to different pinout and control scheme |
Compared with LM27313XSD/NOPB, CS5171GDR8G offers 88% higher switch current and superior 30 V input tolerance, making it more suitable for industrial 24 V bus interfaces; versus TPS61088RHLR, it provides simpler fixed-frequency operation and broader input range but lower peak current capacity.
Availability
CS5171GDR8G is available at Aetrix Electronics and suitable for battery-powered LED drivers, portable instrumentation power supplies, and industrial sensor biasing requiring stable component supply and long-term manufacturability.
Supply support for CS5171GDR8G 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 CS5171GDR8G belongs to ON Semiconductor's legacy high-voltage boost regulator product line, designed specifically for cost-sensitive, medium-power DC-DC conversion in industrial controls, test equipment, and lighting systems where reliability and wide input range are prioritized.
FAQ
What is the maximum output voltage achievable with the CS5171GDR8G?
The CS5171GDR8G supports output voltages up to 40 V, limited by its internal switch breakdown voltage and external component ratings. This is achieved using a resistive feedback divider on the FB pin referenced to the 1.25 V internal reference. Exceeding 40 V risks damaging the internal MOSFET or compromising regulation accuracy, so design margin and component derating must be observed.
Does the CS5171GDR8G require external compensation components?
No, the CS5171GDR8G does not require external compensation components. Its current-mode control architecture and internal compensation network are fully optimized for stability with standard external components (inductor, output capacitor, feedback resistors). The COMP pin is for internal use only and must remain unconnected in all designs.
Can the CS5171GDR8G operate from a single alkaline AA cell?
Yes, the CS5171GDR8G can operate from a single alkaline AA cell, whose voltage ranges from ~1.5 V fresh down to ~0.9 V under load. However, its UVLO turns on at 2.5 V, so it will not start until the cell reaches at least 2.5 V - meaning it is compatible only with multi-cell alkaline configurations (e.g., two cells = 2.4–3.2 V) or lithium primary cells (e.g., CR123A at 3.0 V).
How is thermal performance managed on the CS5171GDR8G?
Thermal performance of the CS5171GDR8G relies on proper PCB layout: the exposed thermal pad (EP) must be soldered to a minimum 100 mm² copper pour connected to internal/external ground planes. With adequate copper area and airflow, it sustains 1.5 A output continuously at +85 °C ambient. Thermal shutdown activates at +165 °C with 20 °C hysteresis to prevent latch-up during overload.
Is the CS5171GDR8G pin-compatible with other ON Semiconductor boost regulators like the CS5172?
No, the CS5171GDR8G is not pin-compatible with the CS5172. While both are boost controllers in SOIC-8EP packages, the CS5172 uses a different pinout (e.g., COMP and SD pins are swapped), has a 500 kHz oscillator, and integrates a P-channel switch instead of N-channel. Direct replacement would require PCB redesign and loop compensation revalidation.
CS5171GDR8G 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:
- Positive
- Topology:
- Boost
- 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:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5171GDR8G FAQ
1.How can I place an order for CS5171GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5171GDR8G 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 CS5171GDR8G reliable?
The price and inventory of CS5171GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5171GDR8G is usually 5 days.
3.What payment methods are accepted for CS5171GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5171GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5171GDR8G?
CS5171GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5171GDR8G 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 CS5171GDR8G?
For technical support, including CS5171GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5171GDR8G requirements.
6.How does Aetrix verify that CS5171GDR8G is sourced from the original manufacturer or authorized distributors?
All CS5171GDR8G 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 CS5171GDR8G meets industry standards.
7.What is the process for return or replacement of CS5171GDR8G?
All CS5171GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5171GDR8G, 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 CS5171GDR8G part is unused and in its original packaging.
Return procedure for CS5171GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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