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onsemi CS5174GD8G
- Part No.:
- CS5174GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5174GD8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
CS5174GD8G from onsemi is a 560 kHz, negative-feedback switching boost regulator 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 employs current-mode control, supports flyback/SEPIC/inverting topologies, and includes thermal shutdown, frequency foldback, and external synchronization - used in industrial DC-DC conversion where compact, wide-input negative rail generation is required.
For engineers reviewing the CS5174GD8G datasheet, pinout, applications, or equivalent options, key selection criteria include its −2.45 V NFB reference accuracy, 560 kHz nominal switching frequency, 1.5 A guaranteed switch current, SOIC-8 package compatibility, and pin-to-pin equivalence with LT1373 for drop-in replacement in negative-output designs.
Technical Context
The CS5174GD8G implements current-mode control using an internal ramp derived from switch current, enabling fast line/load response and inherent pulse-by-pulse current limiting. Its oscillator is trimmed to ±18% accuracy and operates at 560 kHz (base) or drops to 104 kHz under overload via NFB threshold detection (−0.65 V).
It integrates a transconductance negative error amplifier (160 mho typ) with −2.45 V reference, VC pin clamped between 0.5 V and 1.7 V for loop compensation and current limit setting, and features dual ground separation (AGND for analog, PGND for power switch return) to minimize noise coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 560 kHz nominal; reduces to 104 kHz during overload to limit component stress |
| NFB Reference Voltage | −2.45 V (typ); sets regulated negative output voltage via external resistor divider |
| Integrated Switch Current | 1.5 A guaranteed; enables compact boost/flyback designs without external MOSFET |
| Input Voltage Range | 2.7 V to 30 V; supports wide-range industrial and automotive inputs |
| Thermal Shutdown Threshold | 180 °C (typ); with 25 °C hysteresis for reliable overtemperature recovery |
| Shutdown Current | 60 µA max (VCC ≤ 30 V); enables ultra-low-power standby mode |
| Max Duty Cycle | 90% (typ); supports high step-up ratios in boost and SEPIC configurations |
Pinout & Package
CS5174GD8G is housed in an SOIC-8 (Case 751) package with exposed thermal pad (D suffix), rated for industrial temperature range (−40°C to +125°C) and Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Loop compensation & current limit control | Output of negative error amplifier; clamped 0.5–1.7 V; RC network here sets stability and adjusts peak switch current |
| 2 - NFB | Negative feedback input | Senses regulated negative output; referenced to −2.45 V; triggers frequency foldback above −0.65 V |
| 3 - Test | Internal test node | Must be left floating or grounded; voltage 2–6 V disables oscillator and holds switch on |
| 4 - SS | Sync/shutdown control | TTL-compatible; low = shutdown (60 µA mode); external clock up to 1 MHz synchronizes switching |
| 5 - VCC | Power supply input | 2.7–30 V operation; requires local bypass capacitor to AGND for stable bias |
| 6 - AGND | Analog ground reference | Low-noise return for FB/NFB/VC; must be isolated from high-current PGND paths |
| 7 - PGND | Power switch emitter return | High-current path for 1.5 A switch; connects directly to PCB ground plane for thermal and EMI control |
| 8 - VSW | Switch collector output | Drives external inductor/diode; withstands 40 V transient; trace must be short to minimize radiation |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture | Enables immediate line regulation and single-pole loop compensation - simplifies stability design vs. voltage-mode controllers |
| Frequency foldback under fault | Reduces switching frequency to 20% of nominal when NFB > −0.65 V, lowering stress on inductor, diode, and capacitors during short-circuit |
| Dual ground isolation (AGND/PGND) | Prevents switching noise from corrupting feedback sensing - critical for accurate −2.45 V regulation and low-output-ripple performance |
| External sync capability | Accepts TTL-level clock up to 1000 kHz, enabling multi-rail systems to eliminate beat frequencies and reduce EMI |
| Adjustable current limit via VC clamp | Connecting external shunt to VC lowers clamp voltage, scaling peak switch current below 1.5 A for lower-power or thermally constrained layouts |
Applications
| Industrial Negative Bias Supply | Automotive Camera Power Module |
|---|---|
Use Scenario: Generating −5 V or −12 V rail from 12 V battery for CCD image sensors and analog front-ends in ADAS cameras. IC Role / Device Role / Timing Role: Primary negative-output DC-DC controller in inverting topology; regulates output via NFB pin with ±1% reference accuracy over −40°C to +105°C. Use Value: Eliminates need for isolated transformer or dual-output converter; achieves < 50 mVpp ripple with 22 µF ceramic output cap due to 560 kHz switching. |
Use Scenario: Compact negative auxiliary supply in rear-view mirror ECUs powering op-amps and ADC references. IC Role / Device Role / Timing Role: Boost-derived negative regulator operating from 9–16 V unregulated vehicle bus; uses SS pin for ECU-controlled enable/disable sequencing. Use Value: SOIC-8 footprint allows placement near sensor interface ICs; thermal shutdown (180 °C) ensures reliability under hood temperature cycling. |
| Programmable Logic I/O Level Shifter | Test Equipment Auxiliary Rail |
Use Scenario: Providing programmable −3.3 V to −10 V bias for FPGA I/O banks requiring configurable negative termination voltage. IC Role / Device Role / Timing Role: Adjustable negative regulator using resistor-divider on NFB; VC pin modified with Zener clamp to set 1.2 A current limit for safe hot-swap insertion. Use Value: Enables precise output tuning across 4 decades of load (1 mA–1.2 A) while maintaining < 0.5% line regulation from 2.7–30 V input. |
Use Scenario: On-board negative supply for oscilloscope front-end amplifiers and DAC reference buffers requiring low-noise, stable −15 V. IC Role / Device Role / Timing Role: Flyback-configured regulator with transformer isolation; uses AGND/PGND separation to achieve < 15 µV RMS output noise. Use Value: 560 kHz operation allows use of < 10 µH magnetics; frequency sync (via SS) eliminates interference with main 1 GHz sampling clock. |
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 freq, −2.5 V NFB ref, but higher 2.5 A switch current and 40 V VSW rating | Supports higher output power (up to 25 W) and wider output voltage swing (−25 V possible) | Select when >1.5 A load current or >40 V transient tolerance is required; layout identical |
| TPS61086PW | 500 kHz fixed freq; positive-only FB (no NFB pin); requires external inverting op-amp for negative regulation | Not suitable for direct negative-output regulation; needs added components and board area | Consider only if redesigning for positive-regulated intermediate bus feeding inverting charge pump |
Compared with LT1373CS8#PBF, CS5174GD8G offers lower cost and sufficient 1.5 A capability for sub-20 W negative rails, while TPS61086PW lacks native negative feedback support - making CS5174GD8G the optimal choice for dedicated, space-constrained negative DC-DC conversion.
Availability
CS5174GD8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive camera modules, programmable logic interfaces, and test equipment auxiliary rails requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for CS5174GD8G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5174GD8G belongs to onsemi's legacy high-voltage switching regulator product line, designed specifically for compact, wide-input negative- and positive-output DC-DC conversion in harsh-environment embedded systems.
FAQ
What is the exact NFB reference voltage specification for CS5174GD8G?
The CS5174GD8G has a nominal NFB reference voltage of −2.45 V, with a guaranteed range of −2.55 V to −2.35 V across industrial temperature (−40°C to +125°C) and 2.7–30 V input. This value is measured with VC held at 1.25 V and defines the regulation point for negative output voltages - for example, a −12 V output requires R1/R2 = 3.89:1 in the NFB divider network. The CS5174GD8G maintains ±0.01%/V line regulation, ensuring stable output despite input fluctuations.
Can CS5174GD8G be used in a flyback configuration, and what are the key layout considerations?
Yes, CS5174GD8G supports flyback topology per its datasheet, leveraging the NFB pin for negative secondary-side regulation. Critical layout practices include separating AGND (pins 5/6) from PGND (pin 7) with a single-point connection near the IC, routing the VSW trace short and wide to minimize ringing, and placing the transformer primary snubber (TVS + diode) directly across VSW–PGND. The CS5174GD8G's 40 V VSW rating and frequency foldback protect against leakage-inductance spikes - essential for reliable flyback operation with variable loads.
How does the frequency foldback feature operate in CS5174GD8G during overload?
In CS5174GD8G, frequency foldback activates when the NFB pin voltage exceeds −0.65 V (typ), reducing switching frequency from 560 kHz to ~104 kHz. This occurs during startup, short-circuit, or severe overload - extending off-time to limit average inductor current and prevent thermal runaway. The CS5174GD8G sustains this reduced frequency until NFB falls below −0.80 V, allowing safe recovery without latch-off. Unlike hiccup mode, it maintains regulation attempt, making CS5174GD8G suitable for intermittent fault environments like motor drive bias supplies.
Is CS5174GD8G pin-to-pin compatible with LT1373, and are there any design adjustments needed?
Yes, CS5174GD8G is explicitly documented as pin-to-pin compatible with LT1373 in SOIC-8 packaging. No PCB changes are required: all pins (VC, NFB, SS, VCC, AGND, PGND, VSW) map identically, and both share 560 kHz base frequency, −2.5 V NFB reference, and sync/shutdown functionality. However, CS5174GD8G has slightly lower switch current (1.5 A vs. 2.5 A) and 40 V VSW rating (vs. 45 V), so verify peak stress margins in high-VOUT flyback designs before drop-in replacement.
What is the recommended method to reduce the current limit below 1.5 A in CS5174GD8G?
To reduce CS5174GD8G's peak switch current below 1.5 A, connect an external clamp (e.g., Zener diode or resistor divider) between VC and AGND. Since VC voltage controls current limit via VC = ISW × 0.063 Ω × 5, clamping VC to 0.9 V sets ISW ≈ 1.1 A. The CS5174GD8G datasheet confirms this method in Section "Reducing the Current Limit", and recommends using a low-leakage Zener (e.g., BZX84-C3V3) to avoid loading the high-impedance VC node. This adjustment preserves all other CS5174GD8G functions without firmware or external sense resistors.
CS5174GD8G 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
CS5174GD8G FAQ
1.How can I place an order for CS5174GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5174GD8G 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 CS5174GD8G reliable?
The price and inventory of CS5174GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5174GD8G is usually 5 days.
3.What payment methods are accepted for CS5174GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5174GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5174GD8G?
CS5174GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5174GD8G 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 CS5174GD8G?
For technical support, including CS5174GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5174GD8G requirements.
6.How does Aetrix verify that CS5174GD8G is sourced from the original manufacturer or authorized distributors?
All CS5174GD8G 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 CS5174GD8G meets industry standards.
7.What is the process for return or replacement of CS5174GD8G?
All CS5174GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5174GD8G, 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 CS5174GD8G part is unused and in its original packaging.
Return procedure for CS5174GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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