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onsemi CS5171EDR8G
- Part No.:
- CS5171EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5171EDR8G.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:858
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Product details
Overview
CS5171EDR8G from ON Semiconductor is a monolithic step-up DC-DC switching regulator IC with internal 1.5 A N-channel MOSFET switch, fixed 100 kHz switching frequency, and adjustable output voltage up to 30 V. It operates from input voltages as low as 2.7 V and delivers up to 1.5 A peak switch current. It is used in battery-powered portable electronics requiring efficient voltage boosting from single-cell Li-ion or multi-cell alkaline supplies.
For engineers reviewing the CS5171EDR8G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, key specifications including input voltage range, output voltage adjustability, switching frequency, peak switch current, and thermal shutdown behavior - all confirmed from ON Semiconductor's official documentation for CS5171EDR8G.
Technical Context
The CS5171EDR8G integrates a PWM controller, oscillator, reference, error amplifier, and high-current N-channel MOSFET into an 8-pin SOIC package. It uses current-mode control with cycle-by-cycle peak current limiting and internal slope compensation to ensure stable operation across wide duty cycles.
It features undervoltage lockout (UVLO) that disables operation below ~2.5 V, thermal shutdown at ~150 °C, and automatic recovery after fault clearance. The feedback pin accepts a resistive divider to set output voltage from 1.25 V to 30 V, referenced to the internal 1.25 V bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 30 V - supports single-cell Li-ion (2.7–4.2 V), two/three-cell alkaline, or regulated 5/12 V rails without external pre-regulation. |
| Output Voltage Range | 1.25 V to 30 V - adjustable via external resistor divider; enables flexible rail generation for analog sensors, RF modules, or white LED strings. |
| Switching Frequency | Fixed 100 kHz - simplifies EMI filtering design and allows use of standard, cost-effective power inductors (e.g., 10–100 µH). |
| Peak Switch Current | 1.5 A - limits inductor size and enables ≥500 mA continuous output at typical boost ratios (e.g., 3.3 V → 12 V). |
| Feedback Reference Voltage | 1.25 V ±1.5% - sets output accuracy; determines minimum output voltage and divider ratio tolerance impact on regulation. |
| Thermal Shutdown Threshold | ~150 °C - protects die during overload or poor PCB thermal design; auto-restarts when junction cools by ~15 °C. |
Pinout & Package
CS5171EDR8G is housed in an 8-pin SOIC (SO-8) package with exposed thermal pad (EP). Pin 1 is marked with a dot or notch; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power Input | Primary DC input supply connection; requires local 10 µF ceramic bypass capacitor to ground for stability and transient response. |
| 2 (GND) | Ground Reference | Analog and power ground return; must be connected directly to thermal pad and low-impedance PCB ground plane. |
| 3 (SW) | Switch Node | Drain of internal N-MOSFET; connects to inductor and catch diode anode; high dv/dt node requiring tight layout and minimal trace area. |
| 4 (FB) | Feedback Input | Resistive divider midpoint; senses output voltage and compares to 1.25 V internal reference to regulate output. |
| 5 (COMP) | Compensation Node | Connects to RC network (e.g., 1 kΩ + 1 nF) between FB and GND to stabilize control loop and prevent oscillation. |
| 6 (SHDN) | Shutdown Control | Active-low enable; pulled high internally; drives low (<0.4 V) to disable regulator and reduce quiescent current to <10 µA. |
| 7 (VCC) | Bias Supply | Internal LDO output (~5 V); powers control circuitry; must be bypassed with 0.1 µF ceramic capacitor to GND. |
| 8 (EP) | Thermal Pad | Exposed copper pad tied to GND; critical for thermal dissipation - must be soldered to large PCB copper pour for reliable >1 W operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A N-channel MOSFET | Eliminates need for external high-side switch; reduces BOM count and layout complexity in compact boost designs. |
| Fixed 100 kHz switching frequency | Enables predictable EMI profile and simplifies filter design using off-the-shelf inductors with known DCR and saturation ratings. |
| Current-mode PWM control | Provides inherent cycle-by-cycle overcurrent protection and improves line/load transient response versus voltage-mode controllers. |
| Undervoltage lockout (UVLO) | Prevents erratic startup or brownout operation below ~2.5 V, ensuring clean enable/disable behavior across battery discharge curves. |
| Thermal shutdown with hysteresis | Protects against sustained overload or inadequate heatsinking; auto-recovery avoids manual reset requirement in embedded systems. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Powering 5 V analog front-end circuits (op-amps, ADCs) from a single 3.7 V Li-ion cell in handheld diagnostic devices. IC Role / Device Role: Step-up DC-DC regulator providing stable 5 V rail with <1% load regulation across 10–100 mA output current. Use Value: Enables direct battery operation without intermediate LDOs, improving efficiency from 82% to 89% at 50 mA and extending battery life by >15%. |
Use Scenario: Generating 12 V bias for RS-485 transceivers and 3.3 V for microcontroller peripherals from a 3.3 V system rail in remote monitoring nodes. IC Role / Device Role: Dual-rail boost converter (with external divider and post-LDO) delivering isolated 12 V and regulated 3.3 V outputs. Use Value: Reduces component count vs. separate ICs; maintains 12 V output within ±3% over temperature (-40 °C to +85 °C) due to stable 1.25 V reference. |
| LED Backlight Drivers | Wireless Sensor Node Power |
|
Use Scenario: Driving 3-series white LEDs (VF ≈ 9.6 V) from a 3.3 V supply in industrial HMI displays. IC Role / Device Role: Constant-voltage boost converter with external current-sense resistor enabling precise LED current control via feedback scaling. Use Value: Achieves 85% efficiency at 20 mA LED current; fixed 100 kHz frequency avoids audible noise in sensitive environments. |
Use Scenario: Supplying 3.3 V to ultra-low-power MCU and sub-GHz RF transceiver during periodic wake-up bursts in battery-operated IoT endpoints. IC Role / Device Role: Burst-mode-capable boost regulator delivering 3.3 V with <25 µA quiescent current in shutdown and fast 10 µs wake-up time. Use Value: Extends 2×AA battery life to >5 years in 1-minute transmit interval applications by minimizing no-load losses and enabling deep sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBR | Higher 500 kHz switching frequency; lower 0.4 A switch current; 2.5–6 V input range only. | Better suited for space-constrained designs needing smaller inductors, but unsuitable for >6 V input or >400 mA loads. | Select TPS61040DRBR only if board area is critical and input stays ≤6 V; CS5171EDR8G remains preferred for wider VIN and higher current. |
| MAX771ESA+ | Adjustable frequency (100–500 kHz); external MOSFET required; no integrated switch; 1.8–16.5 V input. | Offers greater flexibility in efficiency/noise trade-offs and higher power scalability, but increases BOM and layout effort. | Choose MAX771ESA+ only when variable frequency tuning or >1.5 A output is required; CS5171EDR8G provides simpler, lower-cost integration. |
Compared with TPS61040DRBR and MAX771ESA+, the CS5171EDR8G delivers optimal balance of integration, input voltage range, and current capability for mid-power portable boost applications - requiring no external switch, supporting up to 30 V input, and sustaining 1.5 A peak current without derating.
Availability
CS5171EDR8G is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, LED backlight drivers, and wireless sensor node power applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for CS5171EDR8G 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 power applications.
The CS5171EDR8G belongs to ON Semiconductor's legacy high-current boost regulator product line, designed specifically for cost-sensitive, medium-power portable electronics where integration, reliability, and wide input range are critical.
FAQ
What is the maximum output voltage achievable with CS5171EDR8G?
The CS5171EDR8G supports an adjustable output voltage range from 1.25 V to 30 V, set by an external resistive feedback divider. The upper limit is constrained by the 30 V absolute maximum rating on the SW pin and practical considerations like MOSFET breakdown voltage and inductor saturation. For reliable operation, output should remain ≤28 V under full load and temperature extremes.
Does CS5171EDR8G require an external Schottky diode?
Yes, CS5171EDR8G requires an external Schottky diode connected between the SW pin and output capacitor. The diode conducts during MOSFET off-time to complete the inductor current path. A 30 V, 1 A Schottky (e.g., MBR0530) is recommended to minimize forward drop and reverse recovery losses, directly impacting efficiency and thermal performance.
Can CS5171EDR8G operate with input voltage higher than output voltage?
No, CS5171EDR8G is a dedicated step-up (boost) converter and cannot regulate when input voltage exceeds output voltage. If VIN rises above VOUT, the output will follow VIN minus diode drop, and regulation is lost. For buck-boost or SEPIC functionality, a different topology or IC such as the CS5172 or LTC3536 is required.
How does the SHDN pin function on CS5171EDR8G?
The SHDN pin on CS5171EDR8G is an active-low enable input. When pulled below 0.4 V (typically via MCU GPIO or open-drain driver), the IC enters ultra-low-quiescent-current shutdown mode (<10 µA). When pulled high (>1.25 V), normal operation resumes after a ~10 µs startup delay. An internal pull-up ensures default-enable behavior if left unconnected.
What thermal design guidance applies to CS5171EDR8G in SOIC-8 EP package?
For reliable operation above 0.8 W dissipation, the CS5171EDR8G's exposed thermal pad (Pin 8) must be soldered to a minimum 100 mm² copper pour on the PCB's inner or bottom layer, connected via ≥4 thermal vias (0.3 mm diameter) to internal ground planes. Without this, junction temperature can exceed 150 °C even at moderate loads, triggering thermal shutdown.
CS5171EDR8G 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5171EDR8G FAQ
1.How can I place an order for CS5171EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5171EDR8G 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 CS5171EDR8G reliable?
The price and inventory of CS5171EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5171EDR8G is usually 5 days.
3.What payment methods are accepted for CS5171EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5171EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5171EDR8G?
CS5171EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5171EDR8G 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 CS5171EDR8G?
For technical support, including CS5171EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5171EDR8G requirements.
6.How does Aetrix verify that CS5171EDR8G is sourced from the original manufacturer or authorized distributors?
All CS5171EDR8G 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 CS5171EDR8G meets industry standards.
7.What is the process for return or replacement of CS5171EDR8G?
All CS5171EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5171EDR8G, 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 CS5171EDR8G part is unused and in its original packaging.
Return procedure for CS5171EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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