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onsemi CS5171ED8G
- Part No.:
- CS5171ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5171ED8G.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,587
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Product details
Overview
CS5171ED8G from ON Semiconductor is a monolithic step-up DC-DC switching regulator IC featuring internal 1.5 A NPN switch, fixed 100 kHz switching frequency, and adjustable output voltage up to 40 V. It operates from input voltages as low as 2.7 V and supports continuous output current up to 750 mA in boost configuration. It is used in battery-powered instrumentation requiring regulated high-voltage rails from single-cell Li-ion or multi-cell alkaline sources.
For engineers reviewing the CS5171ED8G datasheet, pinout, applications, or equivalent options, key selection considerations include its integrated NPN switch rating, minimum input voltage for start-up (2.7 V), maximum output voltage capability (40 V), thermal shutdown behavior, and feedback resistor network design for precise output regulation.
Technical Context
The CS5171ED8G employs a current-mode PWM control architecture with internal oscillator set to 100 kHz, enabling stable operation with small external components. Its error amplifier compares a scaled portion of the output voltage against a 1.25 V internal reference to regulate via duty-cycle adjustment.
Startup is initiated when input voltage exceeds the undervoltage lockout threshold of 2.5 V; operation ceases below 2.0 V. The device integrates thermal shutdown that disables the NPN switch at junction temperatures exceeding 150 °C, with automatic recovery upon cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost (step-up) DC-DC converter with integrated NPN switch |
| Switch Current Rating | 1.5 A peak - supports ≥750 mA continuous output under typical conditions |
| Switching Frequency | 100 kHz fixed - enables use of compact, low-ESR ceramic output capacitors and standard power inductors |
| Feedback Reference Voltage | 1.25 V ±1.5% - sets output voltage accuracy via external resistor divider (VOUT = 1.25 × (1 + R1/R2)) |
| Input Voltage Range | 2.7 V to 16 V - compatible with single-cell Li-ion (2.7–4.2 V), 3× alkaline (3.6–4.8 V), or 4× NiMH (4.0–5.2 V) |
| Output Voltage Range | Adjustable from 1.25 V to 40 V - supports high-side biasing, op-amp supplies, and sensor excitation rails |
| Thermal Shutdown Threshold | 150 °C - protects against sustained overload or poor PCB thermal design; auto-recovery on cooldown |
Pinout & Package
CS5171ED8G is housed in an 8-pin SOIC package (SOIC-8, 150 mil width) with exposed thermal pad (D8G suffix). Pin 1 is marked by a dot or notch; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power input | Connects to unregulated DC source (2.7–16 V); requires local 10 µF ceramic bypass capacitor |
| 2 (GND) | Ground reference | System ground return for control circuitry and switch emitter; tie directly to thermal pad |
| 3 (SW) | Switch collector | Drives external inductor; connects to inductor one end and diode anode; high dv/dt node |
| 4 (FB) | Feedback input | High-impedance input sensing output voltage via resistor divider; sets regulation point at 1.25 V |
| 5 (COMP) | Compensation node | Connects external RC network (e.g., 1 kΩ + 1 nF) to stabilize loop response and prevent oscillation |
| 6 (SHDN) | Shutdown control | Logic-low (<0.4 V) disables switching; logic-high (>2.0 V) enables operation; internal pull-down |
| 7 (VCC) | Bias supply | Internal LDO output (≈5 V) powers control circuitry; decouple with 0.1 µF ceramic to GND |
| 8 (NC) | No connect | Not internally bonded; leave unconnected and unpopulated on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A NPN switch | Eliminates need for external transistor, reducing BOM count and layout complexity in space-constrained designs |
| 100 kHz fixed-frequency PWM | Enables predictable EMI profile and simplifies filter design versus variable-frequency alternatives |
| 1.25 V precision feedback reference | Supports ±2% output voltage accuracy over line/load/temperature with proper resistor tolerance selection |
| Thermal shutdown with hysteresis | Prevents permanent damage during transient overloads or inadequate heatsinking; recovers without reset |
| UVLO with 2.5 V turn-on threshold | Ensures reliable startup from partially discharged batteries while avoiding brown-out instability |
| Shutdown pin with 1 µA max quiescent current | Enables system-level power gating for ultra-low standby consumption in portable equipment |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Powering 24 V analog front-end circuits (e.g., strain gauge bridges, RTD interfaces) from a 3.7 V Li-ion cell in handheld diagnostic tools. IC Role / Device Role / Timing Role: Step-up regulator providing stable 24 V rail; no timing-critical function-regulation loop bandwidth ~10 kHz. Use Value: Enables single-cell battery operation without external MOSFET or controller, reducing size and bill-of-materials cost. |
Use Scenario: Generating isolated ±15 V supplies for op-amps and ADC drivers in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Primary boost stage feeding secondary charge-pump or transformer-isolated stages; fixed 100 kHz switching synchronizes downstream filtering. Use Value: Delivers up to 40 V output needed for negative rail generation via inverting topology, with tight regulation across temperature. |
| Automotive Cabin Sensors | Smart Metering Modules |
|
Use Scenario: Supplying 12 V bias to MEMS microphones and Hall-effect sensors in low-power automotive body-control modules. IC Role / Device Role / Timing Role: High-efficiency boost converter operating from 5 V vehicle bus (with pre-regulator) or direct from 3.3 V MCU rail. Use Value: Maintains regulation down to 2.7 V input, supporting cold-crank scenarios where supply dips below nominal. |
Use Scenario: Providing 36 V gate drive for anti-tamper shunt FETs and 24 V auxiliary logic in utility smart meters with long-life primary batteries. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC stage; feedback divider sets exact output for precise FET threshold margining. Use Value: Adjustable output up to 40 V allows margin for battery aging and temperature drift while maintaining functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2731YMF/NOPB | 3 MHz switching frequency, 0.65 A switch, 5.5 V max input, 28 V max output | Better suited for ultra-compact layouts needing smaller inductors/caps; lower output voltage ceiling limits high-side biasing | Select when board area is critical and output ≤28 V suffices; verify loop stability with higher-frequency compensation |
| TPS61040DRVR | 500 kHz switching, 0.5 A switch, 1.8–6 V input, 28 V max output, integrated Schottky diode | Lower quiescent current (50 µA) benefits battery life; lacks thermal shutdown and has lower output voltage range | Prefer for long-life coin-cell applications where 28 V output is adequate and thermal robustness is secondary |
Compared with LM2731YMF/NOPB and TPS61040DRVR, the CS5171ED8G offers higher output voltage headroom (40 V vs. ≤28 V), greater switch current (1.5 A vs. ≤0.65 A), and integrated thermal protection-making it preferable for industrial and medical applications demanding reliability and wide output flexibility.
Availability
CS5171ED8G is available at Aetrix Electronics and suitable for portable medical devices, industrial data acquisition systems, and automotive cabin sensors requiring stable component supply with full traceability and lifecycle support.
Supply support for CS5171ED8G 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 focused on energy-efficient electronics, delivering power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power markets.
The CS5171ED8G belongs to ON Semiconductor's legacy DC-DC converter portfolio designed for cost-sensitive, high-reliability applications where integrated switching capability, thermal robustness, and wide input/output flexibility are essential.
FAQ
What is the minimum input voltage required for the CS5171ED8G to start switching?
The CS5171ED8G features undervoltage lockout (UVLO) with a turn-on threshold of 2.5 V. It begins switching once VIN rises above this level and remains operational down to approximately 2.0 V before disabling. This ensures reliable startup from partially discharged single-cell Li-ion batteries (≥2.7 V typical discharge endpoint) and avoids unstable operation near cutoff.
Can the CS5171ED8G be used in SEPIC or inverting configurations?
The CS5171ED8G is specifically designed and characterized for boost (step-up) topology only. Its internal NPN switch and control architecture do not support SEPIC or inverting configurations. Attempting alternate topologies may result in improper regulation, instability, or device failure. For those functions, ON Semiconductor recommends dedicated SEPIC controllers such as the NCP3063 or NCP3064.
How does the COMP pin function in the CS5171ED8G feedback loop?
The COMP pin on the CS5171ED8G is the error amplifier output node. It must be externally compensated-typically with a series RC network (e.g., 1 kΩ + 1 nF)-to ensure phase margin and prevent oscillation. This network shapes the loop gain and determines transient response; incorrect compensation causes overshoot, ringing, or sustained instability under load steps.
Is the thermal pad on the CS5171ED8G (D8G package) electrically connected?
Yes-the exposed thermal pad on the CS5171ED8G in SOIC-8 D8G package is internally connected to GND (Pin 2). It must be soldered to a thermally robust GND plane on the PCB using multiple vias to achieve effective heat dissipation. Leaving it floating or unconnected compromises thermal performance and risks premature thermal shutdown under load.
What is the recommended output capacitor type and value for stable operation of the CS5171ED8G?
ON Semiconductor specifies a minimum 10 µF low-ESR ceramic capacitor (X5R or X7R dielectric) at the CS5171ED8G output. Larger values (e.g., 22–47 µF) improve ripple suppression and transient response. Aluminum polymer or tantalum capacitors may be used if ESR requirements are met, but ceramics are preferred for lowest impedance across the 100 kHz switching frequency and harmonics.
CS5171ED8G 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:
- 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
CS5171ED8G FAQ
1.How can I place an order for CS5171ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5171ED8G 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 CS5171ED8G reliable?
The price and inventory of CS5171ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5171ED8G is usually 5 days.
3.What payment methods are accepted for CS5171ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5171ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5171ED8G?
CS5171ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5171ED8G 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 CS5171ED8G?
For technical support, including CS5171ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5171ED8G requirements.
6.How does Aetrix verify that CS5171ED8G is sourced from the original manufacturer or authorized distributors?
All CS5171ED8G 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 CS5171ED8G meets industry standards.
7.What is the process for return or replacement of CS5171ED8G?
All CS5171ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5171ED8G, 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 CS5171ED8G part is unused and in its original packaging.
Return procedure for CS5171ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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