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Semtech Corporation SC4524SETRT
- Part No.:
- SC4524SETRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
SC4524SETRT.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,968
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Product details
Overview
SC4524SETRT from Semtech is a programmable-frequency, peak current-mode step-down switching regulator with an integrated 2.3A/30V MOSFET switch, 2.8V–30V input range, adjustable switching frequency up to 1.5MHz, and thermally enhanced SOIC-8 EDP package. It delivers up to 2A output current and is designed for compact point-of-load power supplies in XDSL modems and set-top boxes.
For engineers reviewing the SC4524SETRT datasheet, pinout, applications, or equivalent options, key selection criteria include its programmable frequency via ROSC resistor, hiccup-mode overload protection, soft-start/enable dual-function pin, thermal shutdown behavior, and BST pin bootstrap configuration requirements for high-side gate drive.
Technical Context
The SC4524SETRT implements peak current-mode PWM control with cycle-by-cycle current limiting and internal slope compensation. Its oscillator frequency is set by an external resistor (ROSC) connected between ROSC and GND, enabling precise frequency tuning from ~1.2MHz to 1.6MHz across temperature and supply conditions.
It features integrated soft-start and enable functionality on the SS pin, where pulling below 0.8V disables regulation and sourcing 1.8µA charges the external capacitor to ramp COMP voltage linearly. Overload detection triggers hiccup mode: FB falling below 70% of target initiates soft-start restart after discharge of the SS capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 30V - supports wide industrial and telecom input rails including 12V, 24V, and unregulated adapter outputs. |
| Max Output Current | 2A continuous - limited by integrated 2.3A switch and thermal design of SOIC-8 EDP package with exposed pad. |
| Switching Frequency | Programmable up to 1.5MHz - enables use of small 4.7µH inductors and ceramic output capacitors for space-constrained designs. |
| Current Limit Threshold | 3.2A typical - provides cycle-by-cycle overcurrent protection and defines maximum inductor peak current under transient loads. |
| Soft-Start Time | Externally set via SS capacitor - ramps COMP voltage from 0V to ~1.1V before switching begins, preventing output overshoot and inrush. |
| Thermal Shutdown | 155°C junction temperature - latches off until junction cools by ≥10°C (hysteresis), protecting against sustained overload or poor heatsinking. |
| Bootstrap Voltage Range | VIN + VOUT (max 42V) - requires external diode/capacitor network on BST pin; optimal when tied to VOUT ≥2.5V for efficiency and voltage stress reduction. |
Pinout & Package
SC4524SETRT is housed in an 8-pin SOIC-EDP (Exposed Drain Pad) package with thermally enhanced construction. The underside metal pad must be soldered to PCB ground for effective heat dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch Node | Drain of internal N-channel MOSFET; connects to inductor and catch diode anode; carries high dv/dt and pulsed current. |
| VIN | Power Input | Main DC input supply (2.8V–30V); decoupled with bulk and high-frequency capacitors near this pin. |
| BST | Bootstrap Supply | Provides gate drive voltage for internal high-side switch; requires external 0.1µF–0.47µF ceramic capacitor and diode to VOUT or VIN. |
| GND | Ground Reference | Analog and power ground return; tied directly to exposed pad and system ground plane for low-impedance path. |
| SS | Soft-Start / Enable | Combined function: external capacitor sets soft-start time; pulled <0.8V to disable regulator; sources 1.8µA during start-up. |
| COMP | Error Amplifier Output | Transconductance amplifier output; connects to RC compensation network; controls PWM duty cycle based on FB error. |
| FB | Feedback Input | Resistive divider input sensing output voltage; comparator reference is 0.7V; regulates output by maintaining 0.7V at this pin. |
| ROSC | Frequency Set | Connects external resistor to GND to program oscillator frequency; 12.1kΩ yields ~1.4MHz at TA = 25°C. |
Key Features
| Feature | Design Value |
|---|---|
| Peak Current-Mode Control | Enables stable loop compensation with single-pole dominant pole; simplifies external RC network design using standard Type-II or Type-III compensation. |
| Hiccup Overload Protection | Reduces average power dissipation during sustained short-circuit or overload by cycling soft-start instead of continuous current limiting. |
| Integrated 2.3A Switch | Eliminates need for external MOSFET and driver; reduces BOM count and layout complexity while maintaining 30V breakdown rating. |
| Thermally Enhanced SOIC-8 EDP | Exposed drain pad lowers θJA to 63°C/W and θJC to 5.5°C/W, enabling 2A operation without forced air in typical 4-layer PCB layouts. |
| RoHS/WEEE Compliant | Lead-free termination and halogen-free packaging meet global environmental compliance requirements for consumer and telecom equipment. |
Applications
| XDSL Modems | Set-Top Boxes |
|---|---|
Use Scenario: Powering DSL line interface ICs and analog front-end circuitry requiring clean, regulated 3.3V or 5V from 12V or 24V wall adapters. IC Role / Device Role: Primary DC-DC buck converter delivering up to 2A at fixed or adjustable output voltage with tight load transient response. Use Value: Programmable frequency allows optimization for EMI filtering and inductor size; hiccup protection prevents thermal runaway during line fault conditions. | Use Scenario: Generating core logic and memory supply rails (e.g., 1.2V, 1.8V, 3.3V) from a 12V intermediate bus in hybrid digital/analog video processing systems. IC Role / Device Role: Point-of-load regulator placed close to SoC or FPGA; uses small external components enabled by 1.5MHz operation. Use Value: Soft-start/enable pin supports power sequencing with other rails; thermal shutdown protects against enclosure overheating in fanless enclosures. |
| CPE Equipment | DSP Power Supplies |
Use Scenario: Providing stable 5V/2A for Ethernet PHYs, USB controllers, and wireless baseband processors in customer premises equipment with variable ambient temperatures. IC Role / Device Role: Main system regulator handling dynamic load steps from burst data transmission and RF activity. Use Value: Wide 2.8V–30V input accommodates brownout and surge conditions common in unregulated AC/DC adapters; robust current limit ensures reliability. | Use Scenario: Supplying low-noise, tightly regulated 1.2V or 1.5V to high-performance DSPs used in voice processing or audio codecs. IC Role / Device Role: High-efficiency buck converter operating at 1.2MHz to minimize inductor size while maintaining >85% efficiency at full load. Use Value: External ROSC resistor allows frequency tuning to avoid sensitive bands in audio spectrum; FB accuracy of ±1.5% ensures DSP core voltage stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-5.0/NOPB | Fixed 5V output, 5A capability, 63kHz fixed frequency, TO-263 package | Higher current, lower frequency, larger solution size; no frequency programming or hiccup mode | Choose when fixed 5V output and higher current are required, and board space is not constrained. |
| TPS54227DDAR | 2.95V–6V input, 2A, 700kHz–2.2MHz adjustable frequency, integrated FET, smaller 8-pin SO PowerPAD | Narrower input range, higher minimum VIN, different bootstrap architecture (integrated LDO) | Prefer for low-input-voltage applications (e.g., 5V rail) where footprint and thermal performance are critical. |
Compared with LM2678SD-5.0/NOPB and TPS54227DDAR, SC4524SETRT offers wider input range (2.8V–30V) and true hiccup-mode protection-critical for field-deployed CPE-while retaining programmable frequency for EMI-sensitive designs, but requires careful BST network design unlike the TPS54227's integrated bias LDO.
Availability
SC4524SETRT is available at Aetrix Electronics and suitable for XDSL modems, set-top boxes, and point-of-load applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for SC4524SETRT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, protection, and signal integrity markets.
The SC4524SETRT belongs to Semtech's Power Management product line, engineered for compact, efficient DC-DC conversion in broadband communications and consumer electronics where wide input range and robust protection are essential.
FAQ
What is the absolute maximum voltage rating for the BST pin on the SC4524SETRT?
The absolute maximum voltage rating for the BST pin on the SC4524SETRT is 42V. Exceeding this value risks permanent damage. In practice, the BST voltage equals VIN + VOUT when bootstrapped from the output, so designs must ensure VIN + VOUT ≤ 42V - for example, with VIN = 24V, VOUT must remain ≤ 18V. The datasheet explicitly warns against exceeding this limit under any condition.
How does the SC4524SETRT implement hiccup-mode overload protection?
The SC4524SETRT implements hiccup-mode overload protection by monitoring the FB pin voltage. If FB falls below 70% of its target (i.e., 0.49V for a 0.7V reference), the device shuts down, discharges the SS capacitor via a 0.8µA sink, then recharges it with a 1.8µA source to initiate soft-start again. This cycle repeats until the overload clears - reducing average power dissipation and junction temperature versus constant-current limiting.
Can the SC4524SETRT operate with an input voltage below 2.8V?
No, the SC4524SETRT cannot operate reliably with an input voltage below 2.8V. The datasheet specifies 2.8V as the minimum input voltage for guaranteed operation across temperature and process corners. Below this threshold, startup may fail, regulation becomes unstable, and internal bias circuits may not function - particularly affecting the SS pin current source and oscillator startup. Designs must maintain VIN ≥ 2.8V at all times.
What is the purpose of the ROSC pin on the SC4524SETRT, and how is frequency set?
The ROSC pin on the SC4524SETRT sets the switching frequency by connecting an external resistor to GND. A 12.1kΩ resistor yields ~1.4MHz at 25°C; frequency scales inversely with resistance (e.g., 10kΩ ≈ 1.6MHz, 15kΩ ≈ 1.2MHz). The oscillator uses this resistor to generate a precise clock, enabling EMI optimization and inductor size reduction - a key differentiator versus fixed-frequency regulators like the LM2678.
Is the SC4524SETRT pin-compatible with other Semtech buck regulators such as the SC4512?
No, the SC4524SETRT is not pin-compatible with the SC4512. While both are Semtech buck regulators in SOIC-8 packages, their pinouts differ significantly: SC4524SETRT places ROSC on Pin 3 and FB on Pin 7, whereas SC4512 assigns ROSC to Pin 5 and FB to Pin 6. Substituting without layout revision will cause functional failure - especially misrouting of feedback and frequency programming signals.
SC4524SETRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 27V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC, EDP
SC4524SETRT FAQ
1.How can I place an order for SC4524SETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4524SETRT 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 SC4524SETRT reliable?
The price and inventory of SC4524SETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4524SETRT is usually 5 days.
3.What payment methods are accepted for SC4524SETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4524SETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4524SETRT?
SC4524SETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4524SETRT 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 SC4524SETRT?
For technical support, including SC4524SETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4524SETRT requirements.
6.How does Aetrix verify that SC4524SETRT is sourced from the original manufacturer or authorized distributors?
All SC4524SETRT 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 SC4524SETRT meets industry standards.
7.What is the process for return or replacement of SC4524SETRT?
All SC4524SETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4524SETRT, 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 SC4524SETRT part is unused and in its original packaging.
Return procedure for SC4524SETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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