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onsemi CS5174EDR8G
- Part No.:
- CS5174EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5174EDR8G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,111
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Product details
Overview
CS5174EDR8G 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 features current-mode control, thermal shutdown with 25°C hysteresis, frequency foldback during overcurrent, and supports flyback, SEPIC, and inverting topologies in industrial−40°C to +125°C environments.
For engineers reviewing the CS5174EDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include its −2.45 V NFB reference voltage, 560 kHz nominal switching frequency, 1.5 A guaranteed switch current, SOIC-8 package compatibility, and pin-to-pin equivalence with LT1373 for negative-output designs.
Technical Context
The CS5174EDR8G implements current-mode control using an internal ramp derived from switch current, combined with oscillator-generated slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-error-amplifier architecture includes a transconductance-based negative error amplifier (115–225 mho) referenced to −2.45 V at NFB.
Switching is governed by a trimmed 560 kHz oscillator (±18% accuracy), with frequency shift capability: when NFB exceeds −0.65 V, frequency drops to 104–160 kHz to reduce component stress. The VC pin serves as loop compensation node, clamped between 0.25 V and 1.7 V, and directly controls current limit via external shunt.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current | 1.5 A guaranteed - enables compact inductor selection for ≤1.5 A load applications |
| Switching Frequency | 560 kHz nominal - allows use of smaller magnetics and output capacitors vs. 280 kHz variants |
| NFB Reference Voltage | −2.45 V (typ) - sets regulated negative output voltage via external resistor divider |
| Input Voltage Range | 2.7 V to 30 V - supports wide-input industrial and automotive supply rails |
| Thermal Shutdown | 150°C activation with 25°C hysteresis - prevents latch-up during sustained overload |
| Shutdown Current | ≤60 µA at VCC ≤30 V - ensures ultra-low quiescent power in standby mode |
| Max Duty Cycle | 90% (typ) - supports high step-up ratios in boost and flyback configurations |
Pinout & Package
CS5174EDR8G is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement; pins are arranged in standard dual-inline configuration with GND plane connection via PGND (Pin 7) and AGND (Pin 6).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Loop compensation & current limit control | Output of negative error amplifier; clamp voltage here reduces switch current limit below 1.5 A |
| 2 - NFB | Negative feedback input | Senses regulated negative output; −2.45 V reference triggers regulation and frequency shift at −0.65 V |
| 3 - Test | Internal test logic interface | Leave floating or grounded; 2–6 V applied shuts down oscillator but leaves switch active |
| 4 - SS | Synchronization & shutdown | TTL-low disables switching; external clock up to 1 MHz synchronizes operation |
| 5 - VCC | Power supply input | 2.7–30 V bias rail; requires local bypass capacitor to AGND |
| 6 - AGND | Analog ground reference | Low-noise return for feedback network and error amplifier; separate from PGND |
| 7 - PGND | Power ground return | Emitter return path for 1.5 A switch; must connect to low-impedance ground plane |
| 8 - VSW | Switch collector terminal | Connects to inductor/diode node; withstands up to 40 V transient voltage |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A NPN switch | Eliminates external transistor and driver, reducing BOM count and layout area in DC-DC modules |
| Frequency foldback | Reduces switching frequency to ≤160 kHz under overload, lowering peak currents and thermal stress on magnetics |
| Negative output regulation | Direct −2.45 V NFB reference enables stable negative voltage generation without external op-amps |
| SOIC-8 pin-to-pin compatibility | Swaps directly with LT1373 in existing negative-output boost/flyback layouts-no PCB revision needed |
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle while providing inherent cycle-by-cycle current limiting |
Applications
| Industrial Power Supplies | Automotive Infotainment Systems |
|---|---|
Use Scenario: Generating −5 V or −12 V bias for op-amps, ADCs, and RS-232 transceivers in programmable logic controllers and sensor signal conditioning modules. IC Role / Device Role / Timing Role: Primary negative-output DC-DC controller implementing inverting topology with fixed 560 kHz switching. Use Value: Delivers regulated negative rail from 12 V or 24 V bus with <1% line/load regulation and no external error amplifier required. |
Use Scenario: Supplying −3.3 V for audio codec bias and display interface ICs in head unit mainboards exposed to 12 V battery fluctuations. IC Role / Device Role / Timing Role: Negative-voltage regulator in flyback configuration, leveraging SS pin for EMI reduction via spread-spectrum sync. Use Value: Maintains stable −3.3 V output across −40°C to +105°C ambient with built-in thermal shutdown and frequency foldback during cold-crank events. |
| Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Providing isolated −15 V for photomultiplier tube (PMT) high-voltage bias supplies in portable diagnostic analyzers. IC Role / Device Role / Timing Role: Core controller in SEPIC-derived negative-output stage, using VC pin for precision loop compensation. Use Value: Achieves <5 mVpp output ripple and ±0.5% initial accuracy without trimming, meeting IEC 60601-1 leakage current limits. |
Use Scenario: Generating −10 V reference for precision DACs and analog front-ends in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: High-stability negative regulator in boost topology, utilizing AGND/PGND separation to minimize noise coupling. Use Value: Delivers <10 µV RMS noise floor and 0.01%/°C temperature coefficient over full industrial range for metrology-grade performance. |
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-compatible 560 kHz negative regulator; identical NFB reference (−2.5 V) and SOIC-8 footprint; higher typical shutdown current (100 µA) | Same inverting/flyback use cases; less robust thermal hysteresis (no spec) and no frequency foldback | Select when legacy Linear Tech design reuse is prioritized over enhanced protection features |
| TPS54202DRCT | 500 kHz synchronous buck regulator; positive-only feedback; requires external inverter stage for negative output | Not direct functional replacement; suitable only when redesign permits added complexity and efficiency gain | Choose only if system-level redesign allows synchronous rectification and accepts additional components for polarity inversion |
Compared with LT1373CS8#PBF, CS5174EDR8G adds frequency foldback and tighter thermal hysteresis; compared with TPS54202DRCT, it delivers true integrated negative regulation without external inversion circuitry-reducing solution size by ≥30% in space-constrained instrumentation.
Availability
CS5174EDR8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and medical instrumentation requiring stable component supply with long-term lifecycle assurance.
Supply support for CS5174EDR8G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS517x family was designed specifically for compact, high-efficiency DC-DC conversion in space-constrained systems requiring flexible topology support-including negative output generation without external op-amps or level shifters.
FAQ
What is the exact NFB reference voltage specification for CS5174EDR8G?
The CS5174EDR8G has a guaranteed NFB reference voltage of −2.55 V to −2.35 V (−2.45 V typical) across −40°C to +125°C junction temperature. This value is used directly in the output voltage calculation: VOUT = −2.45 × (R1 + R2)/R2, where R1 and R2 form the feedback divider from output to NFB and from NFB to AGND. The CS5174EDR8G's NFB pin draws −16 µA to −5 µA, requiring careful resistor selection to minimize offset error.
Can CS5174EDR8G be used in boost topology to generate negative output?
Yes, CS5174EDR8G supports inverting boost (also called buck-boost in negative-output configuration) where the output is negative relative to system ground. In this topology, the inductor connects between VCC and VSW, the diode anode ties to VSW, and cathode connects to output capacitor negative terminal; output capacitor positive terminal is grounded. The CS5174EDR8G regulates via NFB pin referenced to −2.45 V, enabling stable −3.3 V, −5 V, or −12 V outputs without external amplifiers.
How does frequency foldback operate in CS5174EDR8G during overload?
In CS5174EDR8G, frequency foldback activates when the NFB pin voltage rises above −0.65 V (typ), causing the oscillator to reduce switching frequency from 560 kHz to 104–160 kHz. This extends off-time, lowers peak inductor current, and reduces thermal stress on external components and the internal switch. The feature is fully automatic and requires no external circuitry-unlike CS5171/3 variants that trigger foldback at FB < 0.4 V.
Is CS5174EDR8G pin-to-pin compatible with CS5173EDR8G?
Yes, CS5174EDR8G and CS5173EDR8G share identical SOIC-8 pinout, electrical ratings, and package dimensions-but differ in feedback polarity: CS5174EDR8G uses NFB for negative output regulation, while CS5173EDR8G uses FB for positive output. Swapping them requires reconfiguring the feedback network and verifying loop stability; both operate at 560 kHz and support same external components except feedback divider polarity.
What is the maximum allowable voltage on the VSW pin of CS5174EDR8G?
The CS5174EDR8G specifies an absolute maximum VSW voltage of 40 V. In boost topology, VSW sees input voltage plus output diode forward drop (e.g., 0.5 V for Schottky); in flyback, it sees VCC × (1 + N), where N is primary-to-secondary turns ratio. Exceeding 40 V risks permanent damage. For protection, place a TVS diode from VSW to PGND rated ≤36 V standoff, or use a snubber network across primary winding to suppress leakage-induced spikes.
CS5174EDR8G 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5174EDR8G FAQ
1.How can I place an order for CS5174EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5174EDR8G 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 CS5174EDR8G reliable?
The price and inventory of CS5174EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5174EDR8G is usually 5 days.
3.What payment methods are accepted for CS5174EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5174EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5174EDR8G?
CS5174EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5174EDR8G 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 CS5174EDR8G?
For technical support, including CS5174EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5174EDR8G requirements.
6.How does Aetrix verify that CS5174EDR8G is sourced from the original manufacturer or authorized distributors?
All CS5174EDR8G 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 CS5174EDR8G meets industry standards.
7.What is the process for return or replacement of CS5174EDR8G?
All CS5174EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5174EDR8G, 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 CS5174EDR8G part is unused and in its original packaging.
Return procedure for CS5174EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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