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onsemi CS5174GDR8G
- Part No.:
- CS5174GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5174GDR8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,709
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Product details
Overview
CS5174GDR8G from onsemi is a 560 kHz current-mode boost regulator IC with integrated 1.5 A NPN power switch, −2.45 V negative feedback reference, and thermal shutdown. It operates from 2.7 V to 30 V input, supports flyback/SEPIC/inverting topologies, and regulates negative output voltages in industrial power supplies.
For engineers reviewing the CS5174GDR8G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-8 pin functions, negative-voltage regulation use cases, and two validated alternative parts for design flexibility.
Technical Context
The CS5174GDR8G implements current-mode control using an internal ramp derived from switch current, enabling immediate line response and inherent pulse-by-pulse current limiting. Its oscillator is trimmed to ±18% accuracy at 560 kHz base frequency, with frequency foldback triggered when NFB exceeds −0.65 V.
It integrates a transconductance negative error amplifier (160 μS typ) referenced to −2.45 V, with VC pin clamped between 0.5 V and 1.7 V for loop compensation and current limit adjustment. Shutdown is activated by TTL-low on SS pin, drawing ≤60 μA at 30 V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 1.5 A guaranteed - sets maximum inductor peak current without external sensing |
| Operating Frequency | 560 kHz nominal - enables compact magnetics and low-profile output filters |
| NFB Reference Voltage | −2.45 V (typ) - defines regulated negative output voltage via external resistor divider |
| Input Voltage Range | 2.7 V to 30 V - supports wide-input industrial and automotive battery-fed systems |
| Thermal Shutdown | 150 °C activation with 25 °C hysteresis - prevents latch-up during sustained overload |
| Shutdown Current | ≤60 μA at 30 V - minimizes standby power in battery-backed applications |
| Max VSW Rating | 40 V - determines minimum breakdown voltage of external flyback transformer or boost diode |
Pinout & Package
CS5174GDR8G is housed in an SOIC-8 (Case 751) package with exposed pad for thermal dissipation. Pin 1 is VC; Pin 8 is VSW. All pins are electrically validated per onsemi datasheet Rev. 23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Loop compensation & current limit control | Output of negative error amplifier; clamped 0.5–1.7 V; RC network here sets stability and adjusts current limit |
| NFB (Pin 2) | Negative feedback input | Senses scaled negative output; −2.45 V reference; >−0.65 V triggers 5:1 frequency foldback |
| Test (Pin 3) | Internal test logic interface | Leave floating or tie to AGND; 2–6 V applied shuts down oscillator but not switch |
| SS (Pin 4) | Synchronization & shutdown | TTL-low disables switching and reduces ICC to ≤60 μA; sync range up to 1 MHz |
| VCC (Pin 5) | Power supply input | 2.7–30 V operation; requires local bypass capacitor to AGND |
| AGND (Pin 6) | Analog ground reference | Low-noise return for FB/NFB resistors and error amplifier; isolated from PGND |
| PGND (Pin 7) | Power ground return | Emitter connection for internal NPN switch; must connect to low-impedance ground plane |
| VSW (Pin 8) | Switch collector node | Connects to inductor/diode in boost or primary winding in flyback; withstands 40 V transient |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A NPN switch | Eliminates external transistor and driver; reduces BOM count and layout area in space-constrained designs |
| Negative output regulation | Direct −2.45 V reference enables stable negative rail generation without inverting op-amp stages |
| Frequency foldback | Reduces switching frequency to 20% of nominal under overload, lowering stress on external components |
| Current-mode architecture | Provides inherent cycle-by-cycle current limiting and simplified loop compensation vs. voltage-mode controllers |
| Pb-free SOIC-8 package | Meets RoHS requirements; compatible with standard reflow profiles including 230 °C peak |
Applications
| Industrial Negative Bias Supply | Automotive Camera Power |
|---|---|
Use Scenario: Generating −5 V or −12 V bias for analog front-ends in PLC I/O modules operating from 12–24 VDC rails. IC Role / Device Role / Timing Role: Primary DC-DC controller regulating negative output via NFB pin; 560 kHz switching enables small 4.7 μH inductors. Use Value: Replaces discrete transistor + PWM IC solutions, reducing component count by ≥4 and improving thermal reliability over temperature. | Use Scenario: Powering image sensor bias rails in ADAS cameras where EMI-sensitive analog circuits require clean negative voltage. IC Role / Device Role / Timing Role: Flyback controller generating isolated −3.3 V from vehicle 9–16 V battery; uses frequency synchronization to avoid AM band interference. Use Value: Integrated current limit and thermal shutdown prevent field failures during cold-crank voltage dips or load shorts. |
| Portable Medical Instrument | Test Equipment Signal Conditioning |
Use Scenario: Providing dual-rail ±3.3 V for precision op-amps in handheld ECG analyzers powered by Li-ion batteries. IC Role / Device Role / Timing Role: Inverting topology converter generating −3.3 V from 3.6 V battery; SS pin used for controlled startup sequencing. Use Value: Wide 2.7–30 V input range accommodates full battery discharge curve without brownout; shutdown current <60 μA extends runtime. | Use Scenario: Generating −15 V for op-amp offset nulling and DAC reference buffers in benchtop oscilloscopes. IC Role / Device Role / Timing Role: SEPIC-based negative regulator delivering low-noise −15 V from 24 V system rail; VC pin compensated for 100 kHz bandwidth. Use Value: Current-mode control ensures stable regulation despite varying load currents from 1 mA to 150 mA across measurement modes. |
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 |
|---|---|---|---|
| LT1373CS8#PBF | Pin-to-pin compatible; same 560 kHz frequency and −2.45 V NFB reference; higher 2.0 A switch rating | Supports higher output current up to 1.2 A; wider VCC range (2.7–40 V); no frequency foldback feature | Select when higher peak current headroom or extended input voltage is required; verify thermal margin with larger switch |
| TPS55340RTER | Non-pin-compatible; 1.5 A switch; adjustable frequency (100 kHz–2.2 MHz); requires external NPN for negative output | Enables programmable switching frequency and soft-start; negative output requires additional transistor and bias network | Select when design flexibility (frequency tuning, spread-spectrum) outweighs BOM simplicity; accept added layout complexity |
Compared with LT1373CS8#PBF and TPS55340RTER, CS5174GDR8G offers the lowest component count for fixed-frequency negative rail generation, with built-in foldback protection and guaranteed 1.5 A current limit in a single SOIC-8 package.
Availability
CS5174GDR8G is available at Aetrix Electronics and suitable for industrial automation, automotive camera systems, portable medical devices, and test equipment requiring stable component supply with long-term lifecycle support.
Supply support for CS5174GDR8G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS517x family was designed specifically for compact, high-efficiency non-isolated and isolated DC-DC conversion in cost-sensitive industrial and consumer power supplies requiring negative or positive regulated outputs.
FAQ
What is the function of the NFB pin on the CS5174GDR8G?
The NFB pin on the CS5174GDR8G is the negative feedback input, internally referenced to −2.45 V. It senses a scaled version of the negative output voltage through an external resistor divider. When the voltage at NFB exceeds −0.65 V, the CS5174GDR8G reduces switching frequency to 20% of nominal to protect external components during overload or short-circuit conditions.
Can the CS5174GDR8G regulate both positive and negative output voltages?
No - the CS5174GDR8G is specifically configured for negative output regulation via its NFB pin and −2.45 V internal reference. The CS5171 and CS5173 variants use the FB pin for positive output regulation. Using CS5174GDR8G for positive outputs is not supported and will result in incorrect regulation or instability.
What is the maximum duty cycle of the CS5174GDR8G in boost configuration?
The CS5174GDR8G has a maximum duty cycle of 90% (typical) in boost topology, as specified in the Electrical Characteristics table. This value decreases with rising junction temperature and is limited by internal timing constraints. For reliable operation, design should maintain duty cycle below 85% to accommodate process variation and thermal derating.
How does the VC pin affect current limiting in the CS5174GDR8G?
The VC pin voltage directly controls the CS5174GDR8G's current limit threshold. The internal switch current is clamped when VC reaches ~1.7 V. Connecting an external clamp (e.g., Zener diode) between VC and AGND lowers this threshold, thereby reducing peak switch current below the nominal 1.5 A - a method documented in the datasheet for custom current limiting.
Is the CS5174GDR8G pin-compatible with the LT1372/1373 series?
Yes - the CS5174GDR8G is explicitly stated as pin-to-pin compatible with LT1372/1373 in the official onsemi datasheet. This includes identical SOIC-8 pinout, matching VCC, GND, FB/NFB, SS, and VSW connections. However, note that LT1372 operates at 280 kHz while CS5174GDR8G runs at 560 kHz, so timing-critical external components may require re-evaluation.
CS5174GDR8G 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:
- 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
CS5174GDR8G FAQ
1.How can I place an order for CS5174GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5174GDR8G 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 CS5174GDR8G reliable?
The price and inventory of CS5174GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5174GDR8G is usually 5 days.
3.What payment methods are accepted for CS5174GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5174GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5174GDR8G?
CS5174GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5174GDR8G 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 CS5174GDR8G?
For technical support, including CS5174GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5174GDR8G requirements.
6.How does Aetrix verify that CS5174GDR8G is sourced from the original manufacturer or authorized distributors?
All CS5174GDR8G 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 CS5174GDR8G meets industry standards.
7.What is the process for return or replacement of CS5174GDR8G?
All CS5174GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5174GDR8G, 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 CS5174GDR8G part is unused and in its original packaging.
Return procedure for CS5174GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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