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onsemi CS5171GDR8
- Part No.:
- CS5171GDR8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5171GDR8.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,711
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Product details
Overview
CS5171GDR8 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 30 V. It operates from input voltages as low as 2.7 V and supports continuous output current up to 750 mA in boost configuration - used in battery-powered instrumentation, portable medical devices, and LED biasing circuits.
For engineers reviewing the CS5171GDR8 datasheet, pinout, applications, or equivalent options, key selection considerations include its integrated NPN transistor, minimum input voltage requirement, output voltage adjustability via external resistor divider, and thermal shutdown protection under sustained overload conditions.
Technical Context
The CS5171GDR8 implements a current-mode PWM control architecture with internal oscillator set to 100 kHz, enabling stable regulation across wide input and load variations. Its feedback loop references a 1.25 V internal bandgap reference at the FB pin, allowing precise output voltage programming.
It integrates thermal shutdown, current limiting, and undervoltage lockout (UVLO) with turn-on threshold at 2.5 V and hysteresis of 0.2 V. The device uses an external Schottky diode and inductor for energy transfer, with no need for external compensation components in standard boost configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost (step-up) DC-DC converter - requires external inductor and Schottky diode to generate output voltage higher than input. |
| Switch Current Limit | 1.5 A typical - sets maximum peak inductor current; limits output power during short-circuit or heavy-load transients. |
| Switching Frequency | 100 kHz fixed - determines size of external inductor and capacitor; enables use of cost-effective, high-saturation-current inductors. |
| Feedback Reference Voltage | 1.25 V ±1.5% - precision internal reference used with external resistor divider to set output voltage (VOUT = 1.25 × (1 + R1/R2)). |
| Input Voltage Range | 2.7 V to 15 V - supports single-cell Li-ion, dual-cell alkaline/NiMH, and regulated 3.3/5 V rails; UVLO prevents erratic startup below 2.5 V. |
| Max Output Voltage | 30 V - defined by breakdown rating of internal NPN switch; limits usable output range in boost mode without external clamping. |
| Thermal Shutdown Threshold | 165 °C - protects die from destructive overheating; device resumes operation after junction cools to ~140 °C. |
Pinout & Package
CS5171GDR8 is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for power dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.7–15 V DC; bypassed externally with ≥10 µF ceramic capacitor near pin to suppress switching noise. |
| GND | Power ground reference | Common return path for input capacitor, output capacitor, and feedback resistors; tied directly to thermal pad for thermal conduction. |
| SW | Switch node | Drives external inductor; connects to cathode of Schottky diode; high dv/dt node requiring short, low-inductance routing. |
| FB | Feedback input | Monitors divided output voltage; internal 1.25 V reference compares against this node to regulate output. |
| COMP | Compensation node | Internal error amplifier output; left unconnected in standard applications - no external compensation required. |
| SD | Shutdown control | Logic-low (<0.3 V) disables switching; logic-high (>2.0 V) enables operation; allows system-level power sequencing. |
| NC | No connect | Pin 7 is internally unused and must remain floating; not bonded or connected on die. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to large copper pour for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A NPN power switch | Eliminates need for external transistor; reduces BOM count and layout complexity in space-constrained boost designs. |
| Fixed 100 kHz oscillator | Enables predictable EMI profile and simplifies filter design; avoids frequency jitter seen in variable-frequency controllers. |
| Adjustable output voltage (up to 30 V) | Supports wide range of sensor bias, LED string, or analog front-end supply requirements using only two external resistors. |
| Thermal shutdown with hysteresis | Prevents permanent damage during sustained overload or poor heatsinking; automatic recovery avoids manual reset requirement. |
| Undervoltage lockout (UVLO) | Ensures clean startup only when input exceeds 2.5 V; prevents brown-out oscillation and erratic regulation during battery discharge. |
Applications
| Portable Medical Sensors | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Powering analog front-end circuitry (e.g., op-amp bias, ADC reference) in handheld glucose meters or pulse oximeters operating from single Li-ion cells. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5 V or 12 V rail from 3.0–3.6 V battery input; provides low-noise, well-regulated supply independent of battery state-of-charge. Use Value: Enables consistent sensor accuracy and signal chain performance across full battery discharge curve without requiring higher-cell-count packs. |
Use Scenario: Supplying 15 V bias to photomultiplier tubes or high-voltage op-amps in field-deployable test equipment powered by rechargeable NiMH batteries. IC Role / Device Role / Timing Role: Boost converter delivering up to 750 mA at 15 V from 2.7–4.2 V input; operates reliably across temperature and load transients. Use Value: Replaces discrete transistor-based boost stages with proven thermal behavior and built-in protection - reducing qualification time and failure modes. |
| LED Backlight Biasing | Industrial Sensor Excitation |
|
Use Scenario: Driving white LED strings (3–5 LEDs in series) in portable diagnostic displays where input is limited to 3.3 V from system rail. IC Role / Device Role / Timing Role: Constant-voltage boost controller regulating output to match forward voltage drop of LED string; SW pin drives external inductor-diode path. Use Value: Delivers uniform brightness without current-source complexity; supports dimming via FB pin modulation or SD pin PWM control. |
Use Scenario: Providing precise 10 V excitation for strain gauge bridges or RTD interfaces in wireless condition-monitoring nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent, adjustable boost regulator maintaining 10.00 V ±1% over temperature and load; FB divider sets exact output. Use Value: Improves measurement resolution and repeatability by eliminating ratiometric errors caused by unstable excitation voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBR | Higher 600 kHz switching frequency; lower 0.5 A switch current; requires external compensation. | Better suited for ultra-compact layouts needing smaller inductors; less capable under high-output-power loads. | Choose when board area is critical and output current ≤300 mA; verify loop stability with recommended compensation network. |
| LT1932ES5#TRMPBF | Constant-current LED driver with 1.2 MHz switching; no adjustable VOUT; dedicated for LED strings. | Designed specifically for driving LEDs with current regulation; lacks general-purpose voltage regulation capability. | Select only for LED-specific biasing; not suitable as a general boost supply due to missing FB pin and fixed current-mode operation. |
Compared with TPS61040DRBR and LT1932ES5#TRMPBF, the CS5171GDR8 offers higher output current capability and simpler implementation for adjustable voltage rails, while trading off switching frequency and LED-specific features - making it optimal for medium-power, general-purpose boost conversion where reliability and ease of design are prioritized.
Availability
CS5171GDR8 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered instrumentation, and industrial sensor excitation requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for CS5171GDR8 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 CS5171GDR8 belongs to ON Semiconductor's legacy DC-DC converter portfolio designed for cost-sensitive, medium-power boost applications where integration, thermal robustness, and ease of use outweigh ultra-high-frequency or ultra-low-IQ requirements.
FAQ
What is the maximum output current capability of the CS5171GDR8 in boost configuration?
The CS5171GDR8 supports up to 750 mA of continuous output current in standard boost topology, assuming adequate thermal management, proper external component selection (e.g., low-DCR inductor, low-VF Schottky diode), and input voltage ≥3.0 V. Peak switch current is internally limited to 1.5 A, but practical output current depends on duty cycle, efficiency, and ambient temperature.
Can the CS5171GDR8 operate from a single alkaline cell?
Yes, the CS5171GDR8 can operate from a single alkaline cell (nominal 1.5 V), but only down to its undervoltage lockout (UVLO) turn-on threshold of 2.5 V. Since a fresh alkaline cell starts at ~1.6 V and drops rapidly under load, reliable operation requires either two alkaline cells (providing ≥2.7 V initially) or use with a low-dropout pre-regulator. The datasheet specifies 2.7 V minimum recommended input for guaranteed functionality.
Is an external compensation network required for stable operation of the CS5171GDR8?
No, the CS5171GDR8 does not require external compensation. Its internal error amplifier and fixed-frequency PWM control are factory-tuned 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 standard applications per ON Semiconductor's design guidelines.
How is output voltage adjusted on the CS5171GDR8?
Output voltage is adjusted using a resistor divider from VOUT to GND, with the center tap connected to the FB pin. The internal 1.25 V reference forces the FB node to 1.25 V, so VOUT = 1.25 × (1 + R1/R2), where R1 is the upper resistor (VOUT to FB) and R2 is the lower resistor (FB to GND). Standard values (e.g., R2 = 10 kΩ, R1 = 24 kΩ) yield 4.25 V output.
Does the CS5171GDR8 support shutdown control, and how is it implemented?
Yes, the CS5171GDR8 supports active-low shutdown via the SD pin. Pulling SD to GND (≤0.3 V) disables the internal switch and places the device in low-current standby mode (<10 µA). Driving SD high (≥2.0 V) enables normal operation. This feature enables system-level power sequencing, battery conservation during sleep modes, and safe power-down before hot-swap events.
CS5171GDR8 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
CS5171GDR8 FAQ
1.How can I place an order for CS5171GDR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5171GDR8 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 CS5171GDR8 reliable?
The price and inventory of CS5171GDR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5171GDR8 is usually 5 days.
3.What payment methods are accepted for CS5171GDR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5171GDR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5171GDR8?
CS5171GDR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5171GDR8 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 CS5171GDR8?
For technical support, including CS5171GDR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5171GDR8 requirements.
6.How does Aetrix verify that CS5171GDR8 is sourced from the original manufacturer or authorized distributors?
All CS5171GDR8 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 CS5171GDR8 meets industry standards.
7.What is the process for return or replacement of CS5171GDR8?
All CS5171GDR8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5171GDR8, 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 CS5171GDR8 part is unused and in its original packaging.
Return procedure for CS5171GDR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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