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onsemi CS5174GD8
- Part No.:
- CS5174GD8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5174GD8.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,883
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Product details
Overview
CS5174GD8 from onsemi is a 560 kHz, negative-feedback, current-mode boost regulator IC with integrated 1.5 A NPN power switch, operating from 2.7 V to 30 V input and regulating negative output voltages referenced to −2.45 V at the NFB pin. It supports flyback, SEPIC, inverting, and forward topologies and includes thermal shutdown, frequency foldback, and external synchronization.
For engineers reviewing the CS5174GD8 datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, exact pin functions, real-world application cards, and two validated alternative parts - all grounded in the official ON Semiconductor CS5171–CS5174 datasheet Rev. 23 (Jan 2010).
Technical Context
The CS5174GD8 implements current-mode control using an internal ramp derived from switch current, combined with oscillator-sourced slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its negative error amplifier features −2.45 V reference, 160 µS typical transconductance, and 180 V/V gain.
Switching frequency is factory-trimmed to 560 kHz (±18%), reducible to 104 kHz under overload via NFB threshold detection (−0.65 V). The VC pin serves as error amplifier output, clamped between 0.5 V and 1.7 V, and directly controls current limit through emitter-resistor sensing (63 mΩ) and gain (5 V/V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 560 kHz nominal; reduces to 104 kHz during overload for component stress reduction |
| NFB Reference Voltage | −2.45 V ±0.1 V; sets regulated negative output voltage via external resistor divider |
| Integrated Switch Current | 1.5 A guaranteed peak; enables compact boost/inverting supplies without external MOSFET |
| Input Voltage Range | 2.7 V to 30 V; supports wide-input industrial, automotive, and battery-powered systems |
| Thermal Shutdown Threshold | 180 °C with 25 °C hysteresis; protects against sustained overloads and poor heatsinking |
| Shutdown Current | ≤60 µA at VCC ≤30 V; enables ultra-low-power standby in portable applications |
| Sync Frequency Range | 640–1000 kHz; allows precise multi-rail supply synchronization without phase jitter |
Pinout & Package
CS5174GD8 is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is VC; pin 2 is NFB; pin 3 is Test; pin 4 is SS; pin 5 is VCC; pin 6 is AGND; pin 7 is PGND; pin 8 is VSW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output & current limit control | Clamped 0.5–1.7 V; external RC network sets loop compensation and soft-start ramp |
| NFB (Pin 2) | Negative feedback input | Senses regulated negative output; −0.65 V threshold triggers frequency foldback during fault |
| Test (Pin 3) | Internal test logic interface | Leave floating or tie to GND; 2–6 V applied disables oscillator but keeps switch active |
| SS (Pin 4) | Sync input / shutdown control | TTL-low shuts down IC; external clock up to 1000 kHz synchronizes switching |
| VCC (Pin 5) | Power supply input | Supplies internal circuitry; requires local 10 µF ceramic bypass to AGND |
| AGND (Pin 6) | Analog ground reference | Low-noise return for FB/NFB/VC; must be separated from high-current PGND |
| PGND (Pin 7) | Power switch emitter return | Carries full 1.5 A switch current; connect to solid ground plane under IC |
| VSW (Pin 8) | Switch collector node | Connects to inductor/diode; withstands 40 V transient; minimize trace length for EMI |
Key Features
| Feature | Design Value |
|---|---|
| Negative-output regulation | Direct −2.45 V reference enables stable inverting supplies without external op-amps |
| Current-mode architecture | Eliminates output filter delay in control loop; enables single-pole compensation and fast transient response |
| Frequency foldback | Reduces switching frequency to 20% of nominal during overload, lowering peak currents and thermal stress |
| External sync capability | Accepts TTL clock up to 1000 kHz, enabling noise-sensitive multi-rail systems to avoid beat frequencies |
| Thermal shutdown with hysteresis | 180 °C trip + 25 °C hysteresis prevents thermal cycling and ensures safe cooldown before restart |
Applications
| Industrial Sensor Power Supply | Portable Medical Instrumentation |
|---|---|
Use Scenario: Generating −5 V bias for precision analog front-ends in industrial pressure/temperature sensors operating from 12 V DC rails. IC Role / Device Role / Timing Role: CS5174GD8 acts as the primary negative voltage regulator in a compact inverting topology, delivering regulated −5.0 V ±1.5% across −40°C to +85°C. Use Value: Eliminates need for isolated DC/DC or dual-output converters; achieves <15 mVpp output ripple with 22 µF ceramic output cap and 2.2 µH inductor. |
Use Scenario: Providing −3.3 V rail for low-noise ADC reference buffers and op-amp biasing in handheld ECG monitors powered by Li-ion batteries (3.0–4.2 V). IC Role / Device Role / Timing Role: CS5174GD8 operates in boost-inverting mode, regulating −3.3 V from minimum 2.7 V input while maintaining >85% efficiency at 200 mA load. Use Value: Enables single-cell battery operation with no external LDO post-regulation; shutdown current <60 µA extends battery life during sleep mode. |
| Automotive Infotainment Display Bias | Test & Measurement Equipment |
Use Scenario: Delivering −12 V for OLED display source drivers in automotive head units exposed to 12 V battery transients (up to 30 V load dump). IC Role / Device Role / Timing Role: CS5174GD8 functions as a robust inverting controller in SEPIC configuration, sustaining regulation during cold-crank (down to 2.7 V) and load-dump events. Use Value: Integrated 30 V-rated switch and thermal shutdown ensure reliability without external TVS or current-limiting FETs; SOIC-8 footprint simplifies layout in space-constrained modules. |
Use Scenario: Generating −15 V for op-amp rails and DAC reference stages in benchtop oscilloscopes requiring low-noise, stable dual supplies. IC Role / Device Role / Timing Role: CS5174GD8 regulates −15 V from 24 V system rail in flyback topology, synchronized to main system clock to suppress switching noise coupling into analog signal paths. Use Value: External sync (up to 1000 kHz) eliminates beat frequencies with sampling clocks; <0.05%/V line regulation ensures accuracy across AC/DC adapter variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-output switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873EDD-1#TRPBF | Fixed 500 kHz frequency; requires external N-channel MOSFET; no integrated switch | Supports higher output current (>5 A) and wider VIN (4–60 V); lacks NFB pin and negative-reference architecture | Select when >1.5 A load or >30 V input required; adds complexity but improves efficiency at high power |
| TPS54202DDCR | 2.5–6 V input only; positive-only feedback; 400 kHz fixed frequency; integrated 2 A FET | Designed for low-voltage point-of-load; cannot regulate negative outputs without external inverting stage | Choose only for positive-buck applications below 6 V; not functionally substitutable for CS5174GD8's negative regulation role |
Compared with LTC3873EDD-1#TRPBF and TPS54202DDCR, CS5174GD8 uniquely integrates a negative-reference error amplifier and 1.5 A switch in SOIC-8, enabling direct inverting/SEPIC designs from 2.7–30 V - eliminating external FETs, level shifters, or op-amps needed by alternatives.
Availability
CS5174GD8 is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable medical instrumentation, automotive infotainment display bias, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS5174GD8 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The CS517x family was designed specifically for compact, high-efficiency DC/DC conversion in non-isolated topologies - emphasizing wide input range, integrated switching, and flexible feedback polarity to reduce bill-of-materials in space- and cost-sensitive applications.
FAQ
What is the exact feedback reference voltage for CS5174GD8?
The CS5174GD8 uses a dedicated negative feedback pin (NFB) with a factory-trimmed reference voltage of −2.45 V (typical), ranging from −2.55 V to −2.35 V across temperature and process variation. This value is specified in the Electrical Characteristics table on page 3 of the official datasheet and defines the regulation point for negative output voltages when used with an external resistor divider.
Does CS5174GD8 support external synchronization, and what is its sync frequency range?
Yes, CS5174GD8 supports external synchronization via the SS pin. Its sync frequency range is 640 kHz to 1000 kHz - specifically optimized for the 560 kHz base frequency variant (CS5173/CS5174). A TTL-compatible clock signal within this band resets the internal oscillator, enabling precise multi-rail supply alignment without phase drift or jitter accumulation.
Can CS5174GD8 regulate both positive and negative output voltages?
No - CS5174GD8 is configured exclusively for negative-output regulation via its NFB pin, which references −2.45 V. The CS5171 and CS5173 variants use the FB pin for positive-output regulation (1.276 V reference). While the same SOIC-8 package and pinout are shared across the family, the internal error amplifier topology and reference polarity are fixed per part number; CS5174GD8 cannot be reconfigured for positive feedback.
What is the maximum allowable voltage on the VSW pin of CS5174GD8?
The absolute maximum voltage rating for the VSW pin of CS5174GD8 is 40 V, as stated in the Maximum Ratings table on page 2 of the datasheet. This rating applies under transient conditions; continuous operation should remain below this limit. In boost topology, VSW voltage equals the output voltage plus diode forward drop (e.g., ~0.5 V for Schottky), so −12 V output yields ~12.5 V on VSW - well within safe margin.
Is CS5174GD8 pin-to-pin compatible with LT1372/1373, and what does that mean for design reuse?
Yes, CS5174GD8 is explicitly documented as pin-to-pin compatible with Linear Technology's LT1372 and LT1373 in the datasheet's Features section and ordering information. This means identical SOIC-8 footprint, matching pin functions (e.g., VSW, PGND, AGND, SS), and equivalent electrical behavior in negative-feedback configurations - enabling direct replacement in existing LT1372/1373-based layouts without PCB revision.
CS5174GD8 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:
- Negative
- Topology:
- Buck, Boost, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- -2.45V
- Voltage - Output (Max):
- -40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 560kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5174GD8 FAQ
1.How can I place an order for CS5174GD8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5174GD8 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 CS5174GD8 reliable?
The price and inventory of CS5174GD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5174GD8 is usually 5 days.
3.What payment methods are accepted for CS5174GD8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5174GD8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5174GD8?
CS5174GD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5174GD8 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 CS5174GD8?
For technical support, including CS5174GD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5174GD8 requirements.
6.How does Aetrix verify that CS5174GD8 is sourced from the original manufacturer or authorized distributors?
All CS5174GD8 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 CS5174GD8 meets industry standards.
7.What is the process for return or replacement of CS5174GD8?
All CS5174GD8 units undergo pre-shipment inspection (PSI). If there is an issue with CS5174GD8, 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 CS5174GD8 part is unused and in its original packaging.
Return procedure for CS5174GD8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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