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Semtech Corporation SC4524BSETRT
- Part No.:
- SC4524BSETRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
SC4524BSETRT.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,438
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Product details
Overview
SC4524BSETRT from Semtech is a 3V–18V input, 2A step-down switching regulator with peak current-mode control, programmable 200kHz–2MHz switching frequency, and precision 1.000V feedback reference. It integrates an NPN power transistor and operates in continuous-conduction mode for point-of-load DC/DC conversion in space-constrained consumer and telecom power supplies.
For engineers reviewing the SC4524BSETRT datasheet, pinout, applications, or equivalent options, key selection criteria include its SOIC-8 EDP thermally enhanced package, hiccup-mode overload protection with frequency foldback, soft-start timing via external capacitor, and compatibility with ceramic output capacitors and Schottky freewheeling diodes.
Technical Context
The SC4524BSETRT employs constant-frequency peak current-mode PWM control with internal 6.1mΩ current-sense resistor and slope compensation to stabilize the inner current loop-reducing LC filter double poles to a single real pole for simplified Type-2 compensation. Its error amplifier features dual non-inverting inputs (1V reference and soft-start-derived bias) enabling precise output tracking during startup.
Protection architecture includes cycle-by-cycle current limiting at ≥2.6A, thermal shutdown at 165°C with 10°C hysteresis, and hiccup-mode response triggered when FB falls below 0.8V (enabling frequency foldback) or SS/EN drops below 1.9V under persistent overload-discharging the soft-start capacitor to force controlled restart cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 18V - supports wide-input industrial and telecom rails including 5V, 12V, and 15V intermediate bus architectures. |
| Output Current | 2A continuous - delivers regulated power for DSP cores, FPGAs, and SoC I/O domains without external pass devices. |
| Switching Frequency | 200kHz to 2MHz - programmable via ROSC resistor; enables compact magnetics and ceramic capacitors while maintaining >85% efficiency at 1A load. |
| Feedback Voltage | 1.000V ±20mV - high-precision reference enables accurate output setting with standard 1% resistor dividers (e.g., 3.3V @ R4=18.2kΩ/R6=102kΩ). |
| Current Limit | 2.6A to 4.3A - cycle-by-cycle limiting protects against short-circuit faults; minimum limit remains stable across –40°C to +125°C junction temperature. |
| Soft-Start Control | Voltage-ramped via external capacitor on SS/EN pin - prevents input surge and output overshoot; full regulation requires SS/EN ≥1.83V. |
| Thermal Resistance | Junction-to-Ambient: 36°C/W - achieved with exposed pad soldered to 4-layer FR4 PCB with thermal vias per JESD51. |
Pinout & Package
SC4524BSETRT is housed in an 8-pin SOIC-8 EDP (Enhanced Dissipation Package) with exposed thermal pad. The package provides low thermal resistance (5.5°C/W junction-to-case) and RoHS/WEEE compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch emitter | Connects to inductor, freewheeling diode cathode, and bootstrap capacitor; carries high di/dt pulsed current-requires minimal trace inductance. |
| 2 IN | Main power supply input | Collector of internal NPN transistor; must be bypassed with low-ESR ceramic capacitor placed adjacent to pin. |
| 3 ROSC | Oscillator frequency set | External resistor to ground programs switching frequency (e.g., 12.1kΩ → 1.3MHz); tolerance directly impacts frequency accuracy. |
| 4 GND | Analog and power ground | Reference for FB, COMP, and SS/EN; connects to exposed pad for thermal and noise performance. |
| 5 SS/EN | Soft-start and enable | Capacitor to ground sets startup time and hiccup timeout; voltage thresholds define shutdown (≤0.2V), no-switch (0.4–1.23V), and armed (≥2.1V) states. |
| 6 COMP | Error amplifier output | Drives PWM comparator; RC network here (e.g., 22.1kΩ/0.47nF/10pF) provides Type-2 compensation for stability. |
| 7 FB | Feedback input | Inverting input of transconductance amplifier; monitors output via resistive divider; <0.8V triggers frequency foldback during overload. |
| 8 BST | Bootstrap supply | Drives NPN base above IN rail via external diode/capacitor; minimum 1.8V BST–SW required for full saturation at 2.6A. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control | Enables fast transient response and simplified loop compensation using only two poles-no need for complex Type-3 networks. |
| Hiccup-mode overload protection | Shuts down converter and retries after soft-start discharge when persistent overcurrent detected; prevents thermal runaway during hard shorts. |
| Programmable switching frequency | 200kHz–2MHz range allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI profile without changing IC. |
| Integrated NPN power transistor | Eliminates external switch and driver; reduces BOM count and layout complexity while maintaining 2A output capability. |
| Thermally enhanced SOIC-8 EDP | Exposed pad soldered to PCB ground plane achieves 36°C/W θJA, enabling 2A operation without heatsink in ambient ≤60°C. |
Applications
| XDSL/Cable Modem Power | Set-Top Box Point-of-Load |
|---|---|
Use Scenario: Powers ADSL line driver, PHY, and microcontroller in residential broadband gateways operating from 12V or 15V intermediate bus. IC Role / Device Role / Timing Role: Primary 3.3V/2A buck regulator delivering clean, regulated power to sensitive analog and digital subsystems. Use Value: Programmable 1MHz+ frequency avoids interference with DSL upstream bands; hiccup protection maintains system uptime during cable fault events. | Use Scenario: Supplies 1.2V core and 3.3V I/O rails for MPEG decoder SoCs in HD digital video receivers. IC Role / Device Role / Timing Role: Secondary buck converter downstream of main 5V rail, providing tightly regulated low-noise power with fast load-step response. Use Value: 1.000V ±20mV feedback reference ensures ±1% output accuracy across temperature; soft-start prevents HDMI hot-plug glitches. |
| LCD/Plasma TV Logic Supply | DSP Power Management |
Use Scenario: Generates 2.5V or 3.3V for TCON (timing controller) and panel interface logic in flat-panel displays. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting dynamic backlight dimming and frame-rate changes. Use Value: 2A output sustains burst currents during display refresh; frequency foldback limits inductor stress during panel short-circuit faults. | Use Scenario: Provides 1.8V/2A supply for TI C6000 or Analog Devices SHARC DSPs in audio processing and industrial control systems. IC Role / Device Role / Timing Role: Core voltage regulator with tight transient response to handle rapid instruction-execution current spikes. Use Value: Peak current-mode architecture achieves <10µs recovery from 50% load step; COMP pin accessibility enables custom loop tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | Fixed 500kHz frequency; MOSFET-based synchronous rectification; lower quiescent current (250µA) | Lacks programmable frequency and hiccup-mode protection; better suited for fixed-frequency, low-IQ battery-powered designs | Select MP2307DN-LF-Z when board space is constrained and 500kHz EMI profile is acceptable; avoid where frequency foldback or adjustable soft-start is required. |
| LM2678SD-ADJ/NOPB | Fixed 260kHz frequency; external NPN transistor; higher max input (40V); no integrated current sense | Requires external current-sense resistor and compensation components; suitable for high-input-voltage industrial supplies | Choose LM2678SD-ADJ/NOPB for >18V input or where thermal design favors discrete transistor placement; not drop-in for SC4524BSETRT layouts. |
Compared with MP2307DN-LF-Z and LM2678SD-ADJ/NOPB, SC4524BSETRT offers unique programmable frequency, integrated NPN with current sensing, and hiccup-mode protection-making it optimal for telecom and consumer electronics requiring flexible EMI management and robust short-circuit resilience.
Availability
SC4524BSETRT is available at Aetrix Electronics and suitable for XDSL modems, set-top boxes, and LCD TV logic supplies requiring stable component supply, RoHS-compliant packaging, and thermally robust SOIC-8 EDP delivery.
Supply support for SC4524BSETRT 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, RF, and signal integrity markets.
The SC4524BSETRT belongs to Semtech's SC45xx family of integrated step-down regulators designed for high-density, high-reliability power conversion in broadband communications and consumer electronics.
FAQ
What is the absolute maximum input voltage rating for SC4524BSETRT?
The SC4524BSETRT has an absolute maximum VIN rating of 24V. Exceeding this voltage-even momentarily-may cause permanent damage. The recommended operating range remains 3V to 18V per datasheet specifications. For 24V input applications, external clamping or pre-regulation is required before feeding into the SC4524BSETRT IN pin.
Does SC4524BSETRT support synchronous rectification?
No, SC4524BSETRT does not support synchronous rectification. It integrates a single NPN power transistor and requires an external Schottky freewheeling diode (e.g., 20BQ030) connected between SW and GND. This asynchronous topology simplifies design but limits peak efficiency compared to synchronous buck controllers.
How is the soft-start time determined for SC4524BSETRT?
The soft-start time for SC4524BSETRT is set by an external capacitor connected from the SS/EN pin to GND. With typical charging current of ~1.7µA, a 10nF capacitor yields ~6ms rise to 1.23V threshold. Full regulation requires SS/EN ≥1.83V, so total soft-start duration depends on both capacitance value and the internal current source characteristics across temperature.
What is the purpose of the BST pin on SC4524BSETRT?
The BST pin on SC4524BSETRT supplies gate drive voltage to the internal NPN transistor's base, generated via an external bootstrap diode and capacitor. This allows the base to swing above the IN rail-reducing VCE(sat) and improving efficiency. Minimum BST–SW voltage of 1.8V is required at 2.6A to ensure full transistor saturation.
Can SC4524BSETRT operate with ceramic output capacitors only?
Yes, SC4524BSETRT is fully compatible with ceramic output capacitors. Its peak current-mode control and Type-2 compensation support stable operation with low-ESR ceramics (e.g., 10µF–47µF X5R). Avoid Z5U/Y5V types due to voltage/temperature coefficient drift that can destabilize regulation.
SC4524BSETRT 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):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC, EDP
SC4524BSETRT FAQ
1.How can I place an order for SC4524BSETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4524BSETRT 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 SC4524BSETRT reliable?
The price and inventory of SC4524BSETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4524BSETRT is usually 5 days.
3.What payment methods are accepted for SC4524BSETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4524BSETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4524BSETRT?
SC4524BSETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4524BSETRT 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 SC4524BSETRT?
For technical support, including SC4524BSETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4524BSETRT requirements.
6.How does Aetrix verify that SC4524BSETRT is sourced from the original manufacturer or authorized distributors?
All SC4524BSETRT 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 SC4524BSETRT meets industry standards.
7.What is the process for return or replacement of SC4524BSETRT?
All SC4524BSETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4524BSETRT, 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 SC4524BSETRT part is unused and in its original packaging.
Return procedure for SC4524BSETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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