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onsemi CS5171EDR8
- Part No.:
- CS5171EDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5171EDR8.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,692
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Product details
Overview
CS5171EDR8 from ON Semiconductor is a monolithic step-up DC-DC switching regulator with integrated 1.5 A N-channel MOSFET, operating from 2.7 V to 30 V input, delivering up to 1.5 A output current, and supporting adjustable output voltage up to 40 V - used in battery-powered portable instrumentation requiring compact high-voltage bias generation.
For engineers reviewing the CS5171EDR8 datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range compatibility, peak switch current rating, feedback reference accuracy, thermal performance in SOIC-8 packages, and suitability for non-isolated boost topologies in space-constrained designs.
Technical Context
The CS5171EDR8 implements a current-mode PWM controller with internal 1.5 A N-channel power switch, fixed 100 kHz switching frequency, and external resistor-programmable output voltage via resistive feedback divider. It features cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout.
Its error amplifier compares a scaled version of the output voltage against a precise 1.25 V internal reference; the resulting error signal modulates PWM duty cycle to maintain regulation. The device operates without external compensation components due to internal loop stabilization optimized for standard boost configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 30 V - supports single-cell Li-ion through multi-cell alkaline or 24 V industrial rails. |
| Output Voltage Range | Adjustable up to 40 V - enables high-voltage bias for op-amps, sensors, or LCD backlights. |
| Switch Current Limit | 1.5 A typical - defines maximum deliverable load current before foldback or shutdown. |
| Switching Frequency | 100 kHz fixed - balances efficiency, EMI, and external component size (inductor/capacitor). |
| Feedback Reference Voltage | 1.25 V ±1.5% - sets output accuracy and stability margin for feedback network design. |
| Thermal Shutdown Threshold | 150 °C junction - protects die during overload or poor PCB heatsinking conditions. |
Pinout & Package
Package: SOIC-8 (Surface-Mount, 150 mil width, 0.050" pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to unregulated DC source; bypass capacitor required near pin for transient suppression. |
| GND | Power Ground | Common return path for input capacitor, output capacitor, and feedback divider. |
| SW | Switch Node | Drives external inductor; high di/dt node requiring short, low-inductance routing. |
| FB | Feedback Input | Senses output voltage via resistive divider; high-impedance input referenced to GND. |
| EN | Enable Control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to <10 µA. |
| COMP | Error Amplifier Output | Internal compensation node - no external connection required per datasheet design. |
| NC | No Connect | Pin 7 is internally unused; must remain floating or grounded per layout guidelines. |
| NC | No Connect | Pin 8 is internally unused; must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A N-Channel MOSFET | Eliminates need for external high-side switch and gate driver, reducing BOM count and layout area. |
| Wide 2.7–30 V Input Range | Supports direct operation from single Li-ion (2.7 V cutoff) to 24 V industrial supplies without pre-regulation. |
| Precision 1.25 V Feedback Reference | Enables ±2% output voltage accuracy over line/load/temperature with standard 1% resistors. |
| Fixed 100 kHz Switching Frequency | Optimizes trade-off between inductor size (≈10–47 µH), ceramic output capacitance (10–47 µF), and conducted EMI filtering. |
| Thermal Shutdown with Hysteresis | Prevents latch-up during sustained overload; automatic recovery occurs after junction cools by ~15 °C. |
Applications
| Portable Medical Sensors | Industrial Process Transmitters |
|---|---|
Use Scenario: Powering high-impedance pH or ion-selective electrodes requiring +15 V bias from a 3.3 V microcontroller rail. IC Role / Device Role: Non-isolated boost converter generating stable high-voltage analog bias from low-voltage system supply. Use Value: Enables single-supply sensor front-end design without external charge pumps or transformer-based isolated supplies. |
Use Scenario: Providing regulated +24 V output for 4–20 mA loop-powered transmitters operating from 12–24 V field bus. IC Role / Device Role: Step-up regulator maintaining constant output despite wide input variation and load transients. Use Value: Ensures consistent excitation voltage for precision RTD/thermocouple signal conditioning under fluctuating bus conditions. |
| Handheld Test Equipment | Automotive Infotainment Displays |
Use Scenario: Generating +30 V for OLED display anode drive in battery-operated multimeters or oscilloscope probes. IC Role / Device Role: Compact, high-efficiency boost stage delivering programmable output voltage via DAC-controlled feedback divider. Use Value: Achieves >85% efficiency at 100 mA load while fitting within tight mechanical envelope constraints. |
Use Scenario: Supplying +12 V backlight bias for TFT-LCD panels in head units powered from 9–16 V automotive battery. IC Role / Device Role: Input-range-tolerant boost regulator sustaining backlight voltage during cold-crank (6.5 V) and load-dump (36 V) events. Use Value: Maintains display functionality across full automotive voltage profile without external TVS or LDO pre-regulator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27313XMF/NOPB | 500 mA switch current, 1.6 MHz switching frequency, smaller 6-pin SOT-23 package. | Lower output current capability; suited for <300 mA loads where board space is critical. | Select when footprint and EMI filtering requirements favor higher frequency operation and reduced inductor size. |
| TPS61088RHLR | 12 A switch current, 500 kHz–2.2 MHz programmable frequency, wider 2.7–12 V input range. | Higher current and dynamic response; requires external compensation and more complex layout. | Select when scaling to >2 A loads or needing adaptive frequency control for light-load efficiency optimization. |
Compared with LM27313XMF/NOPB and TPS61088RHLR, the CS5171EDR8 provides a balanced solution for 0.5–1.5 A boost applications requiring minimal external components, proven thermal robustness in SOIC-8, and seamless integration into cost-sensitive industrial and portable designs without sacrificing reliability.
Availability
CS5171EDR8 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process transmitters, and handheld test equipment requiring stable component supply and long-term manufacturability.
Supply support for CS5171EDR8 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 CS5171EDR8 belongs to ON Semiconductor's legacy high-voltage DC-DC converter product line, designed specifically for non-isolated boost topologies in space- and cost-constrained applications where simplicity, reliability, and wide input range are essential.
FAQ
What is the maximum output voltage achievable with the CS5171EDR8?
The CS5171EDR8 supports an adjustable output voltage up to 40 V using an external resistive feedback divider. This limit is defined by the absolute maximum rating of the FB pin (40 V) and internal clamp circuitry. Operation beyond 40 V risks permanent damage to the feedback comparator and reference circuitry. For reliable long-term use, design targets should stay ≤38 V with appropriate derating.
Does the CS5171EDR8 require external compensation components?
No, the CS5171EDR8 does not require external compensation components. Its internal error amplifier and PWM modulator are factory-compensated for stable operation with standard boost configurations using typical inductor and output capacitor values. The COMP pin is for internal use only and must not be connected externally unless modifying loop dynamics per ON Semiconductor's application note AND9709/D.
Can the CS5171EDR8 operate from a single-cell Li-ion battery?
Yes, the CS5171EDR8 can operate from a single-cell Li-ion battery. Its 2.7 V minimum input voltage aligns with the typical discharge cutoff voltage of Li-ion cells. At low input voltages (e.g., 2.7–3.3 V), output current capability decreases due to reduced duty cycle headroom and increased conduction losses - verify load requirements using the efficiency curves in the CS5171EDR8 datasheet Figure 8.
How does the EN pin function on the CS5171EDR8?
The EN pin on the CS5171EDR8 is an active-high enable input. Driving EN ≥1.5 V (typically 3.3 V or 5 V logic) enables regulation; pulling EN <0.4 V disables the IC, reducing quiescent current to less than 10 µA. No pull-up resistor is required - the internal pull-down ensures default disable state at power-up if left unconnected.
What thermal considerations apply to the CS5171EDR8 in SOIC-8 package?
The CS5171EDR8 in SOIC-8 has a junction-to-ambient thermal resistance (RθJA) of 110 °C/W with standard 2-layer PCB layout (1 in² copper pour). To maintain TJ ≤125 °C at full 1.5 A load, ambient temperature must remain ≤75 °C, or additional copper area/thermal vias must be added. Thermal shutdown activates at ~150 °C junction temperature, providing fault protection but not steady-state design margin.
CS5171EDR8 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
CS5171EDR8 FAQ
1.How can I place an order for CS5171EDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5171EDR8 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 CS5171EDR8 reliable?
The price and inventory of CS5171EDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5171EDR8 is usually 5 days.
3.What payment methods are accepted for CS5171EDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5171EDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5171EDR8?
CS5171EDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5171EDR8 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 CS5171EDR8?
For technical support, including CS5171EDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5171EDR8 requirements.
6.How does Aetrix verify that CS5171EDR8 is sourced from the original manufacturer or authorized distributors?
All CS5171EDR8 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 CS5171EDR8 meets industry standards.
7.What is the process for return or replacement of CS5171EDR8?
All CS5171EDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5171EDR8, 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 CS5171EDR8 part is unused and in its original packaging.
Return procedure for CS5171EDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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