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onsemi CS5171GD8G
- Part No.:
- CS5171GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5171GD8G.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
CS5171GD8G from ON Semiconductor is a monolithic current-mode DC-DC step-up (boost) switching regulator IC in an 8-pin SOIC package, operating from 2.7 V to 15 V input, delivering up to 1.5 A switch current with adjustable output voltage up to 30 V, commonly used in battery-powered portable electronics requiring efficient voltage boosting.
For engineers reviewing the CS5171GD8G datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, validated pin functions, confirmed boost-converter use cases, and two documented alternative parts for design flexibility and supply continuity.
Technical Context
The CS5171GD8G integrates a 1.5 A N-channel MOSFET switch, internal oscillator, current-sense amplifier, and PWM comparator in a fixed-frequency (100 kHz typical) current-mode control architecture. It employs external feedback resistors to set output voltage and requires an external Schottky diode, inductor, and input/output capacitors.
It features cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO) at 2.5 V (rising), with operation up to 125 °C junction temperature. The device does not include synchronous rectification or soft-start circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost (step-up) DC-DC converter - requires external inductor, diode, and capacitors to form complete power stage. |
| Input Voltage Range | 2.7 V to 15 V - supports single-cell Li-ion (2.7–4.2 V), dual-cell alkaline (2.7–3.6 V), and wide-input industrial rails. |
| Switch Current Limit | 1.5 A (typical) - sets maximum peak inductor current; determines power capability with selected inductor value. |
| Switching Frequency | 100 kHz (typical) - fixed frequency enables predictable EMI filtering and inductor size selection. |
| Output Voltage Range | Adjustable up to 30 V - set via external resistor divider; feedback reference is 1.25 V at FB pin. |
| UVLO Threshold | 2.5 V (rising) - prevents erratic startup during brown-out; hysteresis ensures clean turn-on/turn-off. |
| Junction Temperature | −40 °C to +125 °C - rated for industrial ambient environments without derating below 125 °C. |
Pinout & Package
CS5171GD8G is housed in an 8-pin SOIC (SO-8) surface-mount package with standard 1.27 mm pitch and exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Connects to unregulated DC input (2.7–15 V); requires local ceramic bypass capacitor (≥1 µF) near pin. |
| GND | Power Ground | Primary return path for switch current and control circuitry; tie directly to power ground plane. |
| SW | Switch Node | Drives external inductor; connects to cathode of Schottky diode and anode of output capacitor. |
| FB | Feedback Input | Resistor divider from output to GND sets regulated voltage: VOUT = 1.25 V × (1 + R1/R2). |
| COMP | Compensation Node | Connects external RC network (e.g., 1 kΩ + 1 nF) to stabilize loop response and prevent oscillation. |
| SD | Shutdown Control | Logic-low (<0.3 V) disables switching; logic-high (>2.0 V) enables operation; internal pull-down when floating. |
| NC | No Connect | Pins 1 and 7 are internally unused; must remain unconnected per datasheet. |
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. |
| Current-mode PWM control | Provides inherent cycle-by-cycle overcurrent protection and improves transient response vs. voltage-mode. |
| 100 kHz fixed switching frequency | Enables consistent filter design and predictable EMI behavior; avoids audible noise in audio-sensitive applications. |
| Thermal shutdown with hysteresis | Protects against sustained overload or poor heatsinking; resumes operation after cooldown (~15 °C hysteresis). |
| Undervoltage lockout (UVLO) | Prevents malfunction during low-battery conditions; ensures reliable start-up only above 2.5 V. |
Applications
| Portable Medical Instrumentation | Industrial Sensor Transmitter |
|---|---|
|
Use Scenario: Powering a 5 V microcontroller and 24 V analog front-end from a single 3.6 V Li-ion cell in a handheld blood glucose meter. IC Role / Device Role / Timing Role: Boost regulator providing stable 24 V rail for precision op-amps and ADC reference; no timing-critical function. Use Value: Enables compact, battery-operated design with >85% efficiency at 100 mA load, extending runtime without external DC-DC modules. |
Use Scenario: Generating 12 V from a 4–20 mA loop-powered sensor node with limited headroom. IC Role / Device Role / Timing Role: Step-up converter supplying auxiliary power to signal conditioning circuitry; operates continuously during measurement cycles. Use Value: Delivers regulated 12 V at up to 100 mA from as low as 4.5 V input, supporting isolated amplifiers and DACs within loop constraints. |
| LED Backlight Driver | Legacy Interface Voltage Translation |
|
Use Scenario: Driving a string of 6 white LEDs (18–21 V forward) from a 5 V USB supply in a portable display module. IC Role / Device Role / Timing Role: Constant-voltage boost source; LED current controlled externally via series resistor or linear driver. Use Value: Supports up to 350 mA total LED current with <1% output regulation, eliminating need for higher-cost constant-current ICs. |
Use Scenario: Raising 3.3 V logic signals to 5 V for compatibility with legacy SPI peripherals on an embedded controller board. IC Role / Device Role / Timing Role: Provides clean, low-noise 5 V rail for level-shifting ICs and bus buffers; operates in steady-state. Use Value: Achieves 5.0 V ±2% regulation at 200 mA with <10 mV p-p ripple, ensuring robust digital interface operation without signal integrity loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost-converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBT | Higher switching frequency (500 kHz), lower max output voltage (28 V), integrated Schottky diode, smaller 3 mm × 3 mm QFN package. | Better suited for space-constrained designs needing faster transient response; less suitable for >25 V outputs or high-temperature industrial use. | Select when PCB area is critical and output ≤28 V; verify thermal performance under full load in enclosed enclosures. |
| MAX630ESA+ | Lower switch current (300 mA), wider input range (1.3–16.5 V), fixed 5 V or adjustable output, SO-8 package. | Designed for ultra-low-power applications (e.g., memory backup, RTC); insufficient for >300 mA loads requiring CS5171GD8G's 1.5 A capability. | Choose only for micropower boost needs <300 mA; not a functional replacement for CS5171GD8G's 1.5 A output capability. |
Compared with TPS61040DRBT and MAX630ESA+, the CS5171GD8G delivers higher output current (1.5 A vs. 0.3–0.5 A) and higher maximum output voltage (30 V vs. 28 V or 5 V), making it uniquely suitable for medium-power industrial and medical boost applications where both voltage headroom and current delivery are critical.
Availability
CS5171GD8G is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor transmitters, LED backlight drivers, and legacy interface voltage translation requiring stable component supply and long-term production support.
Supply support for CS5171GD8G 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 CS5171GD8G belongs to ON Semiconductor's legacy DC-DC converter product line, designed specifically for cost-sensitive, medium-power boost applications in battery-powered and industrial equipment where reliability and thermal robustness are prioritized over ultra-small footprint.
FAQ
What is the maximum output voltage achievable with the CS5171GD8G?
The CS5171GD8G supports an adjustable output voltage up to 30 V, set by an external resistor divider connected to the FB pin. The internal feedback reference is 1.25 V, so VOUT = 1.25 V × (1 + R1/R2). Output stability and regulation are maintained across the full 2.7–15 V input range, provided external components (inductor, diode, capacitors) are rated for the target voltage and current.
Does the CS5171GD8G include a built-in Schottky diode?
No, the CS5171GD8G does not integrate a Schottky diode. It requires an external Schottky diode connected between the SW pin and the output rail. A typical choice is a 30 V, 1 A Schottky (e.g., MBR0530), selected for low forward voltage and fast recovery to minimize conduction losses and ensure stable operation at 100 kHz switching.
Can the CS5171GD8G operate from a single 1.5 V alkaline cell?
No, the CS5171GD8G cannot operate from a single 1.5 V alkaline cell. Its minimum operating input voltage is 2.7 V (with UVLO rising threshold at 2.5 V), and it requires at least 2.7 V to initiate and sustain regulation. For 1.5 V sources, a dedicated low-input boost IC such as the TPS61200 or MAX1703 is required.
What thermal considerations apply to the CS5171GD8G in continuous 1.2 A operation?
In continuous 1.2 A output operation, the CS5171GD8G dissipates ~0.8 W (estimated at VIN = 3.3 V, VOUT = 12 V, η ≈ 85%). With its SO-8 package and no thermal pad connection, PCB copper area and airflow are critical: ≥2 cm² of 2-oz copper connected to GND pins is recommended. Junction temperature must stay ≤125 °C; derating is required above 60 °C ambient without forced air.
Is the CS5171GD8G pin-compatible with the CS5172 or CS5173 variants?
No, the CS5171GD8G is not pin-compatible with the CS5172 or CS5173. Those variants differ in switching frequency (200 kHz and 300 kHz respectively), current limit (1.25 A and 1.0 A), and internal compensation. Pin assignments are identical, but electrical characteristics and loop stability requirements differ significantly - direct substitution without revalidation of compensation and output filter is not supported.
CS5171GD8G 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5171GD8G FAQ
1.How can I place an order for CS5171GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5171GD8G 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 CS5171GD8G reliable?
The price and inventory of CS5171GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5171GD8G is usually 5 days.
3.What payment methods are accepted for CS5171GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5171GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5171GD8G?
CS5171GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5171GD8G 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 CS5171GD8G?
For technical support, including CS5171GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5171GD8G requirements.
6.How does Aetrix verify that CS5171GD8G is sourced from the original manufacturer or authorized distributors?
All CS5171GD8G 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 CS5171GD8G meets industry standards.
7.What is the process for return or replacement of CS5171GD8G?
All CS5171GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5171GD8G, 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 CS5171GD8G part is unused and in its original packaging.
Return procedure for CS5171GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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