My Inquiry
My Account
Semtech Corporation SC4524ASETRT
- Part No.:
- SC4524ASETRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
SC4524ASETRT.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC4524ASETRT from Semtech is a 28V input, 2A step-down switching regulator with peak current-mode control, programmable 200kHz–2MHz switching frequency, 1V precision feedback voltage, and integrated NPN power transistor in thermally enhanced SOIC-8 EDP package. It delivers stable 5V/2A output for XDSL modems and point-of-load applications requiring high efficiency under wide input range.
For engineers reviewing the SC4524ASETRT datasheet, pinout, applications, or equivalent options, key selection factors include its 2.6A switch current limit, hiccup-mode overload protection with frequency foldback, soft-start control via SS/EN pin, thermal shutdown at 165°C, and compatibility with ceramic output capacitors in compact layouts.
Technical Context
The SC4524ASETRT employs constant-frequency peak current-mode PWM control with an internal 6.1mΩ current-sense resistor and slope compensation to stabilize the inner current loop, reducing LC filter poles and enabling fast transient response with Type-2 compensation. Its oscillator frequency is set by an external ROSC-to-ground resistor, supporting 230kHz–1.56MHz operation depending on resistor value.
Protection architecture includes cycle-by-cycle current limiting (trip threshold: 20mV), hiccup-mode short-circuit response triggered when FB falls below 0.8V, and thermal shutdown with 10°C hysteresis. The BST pin requires external bootstrap diode-capacitor circuitry to drive the NPN transistor base above VIN for low VCE(SAT) (250–400mV at –2.6A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 28V - supports wide industrial and telecom input rails including 12V, 24V, and 28V systems without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering DSPs, FPGAs, and SoCs in CPE equipment and set-top boxes. |
| Switching Frequency | 200kHz to 2MHz - enables use of small 8.2µH inductors and ceramic capacitors for miniaturized PCB layouts. |
| Feedback Voltage | 1.000V ±20mV - enables precise output regulation across temperature (±0.01V drift from –40°C to +125°C). |
| Switch Current Limit | 2.6A to 4.3A - provides robust overcurrent protection while allowing 2A load with 30% margin for ripple and transients. |
| Thermal Shutdown | 165°C with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Package | SOIC-8 EDP with exposed thermal pad - achieves 36°C/W junction-to-ambient thermal resistance on 4-layer FR4 PCB with thermal vias. |
Pinout & Package
SC4524ASETRT is housed in an 8-pin SOIC-EDP (Enhanced Dissipation Package) with exposed thermal pad soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Emitter of internal NPN power transistor | Connects to inductor, freewheeling diode cathode, and bootstrap capacitor - carries full switched current; layout must minimize trace inductance. |
| 2 IN | Power supply input / collector of NPN transistor | Accepts 3–28V input; must be bypassed with ≥22µF ceramic capacitor close to pin to suppress high-frequency ripple. |
| 3 ROSC | Oscillator frequency programming node | External resistor to ground sets switching frequency (e.g., 12.1kΩ → 1.3MHz); tolerance directly impacts timing accuracy. |
| 4 GND | Analog and power ground reference | Common return for error amplifier, current sense, and thermal pad - must connect to solid ground plane with multiple vias. |
| 5 SS/EN | Soft-start timing and enable control | Capacitor to ground sets startup ramp time; voltage thresholds (0.3V shutdown, 1.13V enable, 2.15V hiccup arm) define protection behavior. |
| 6 COMP | Error amplifier output | Drives PWM comparator; RC network here (e.g., 22.1kΩ/0.47nF/10pF) stabilizes voltage loop with Type-2 compensation. |
| 7 FB | Inverting input of error amplifier | Monitors output via resistive divider; <0.8V triggers frequency foldback for short-circuit robustness. |
| 8 BST | Bootstrap supply for NPN base drive | Requires external diode + 0.1µF ceramic cap tied between BST and SW; minimum 1.8V BST-SW needed for full saturation. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control | Enables single-pole loop compensation and fast load transient response (<10µs recovery) without complex tuning. |
| Hiccup-mode overload protection | Shuts down converter upon persistent overcurrent, retries after soft-start capacitor discharges below 1.0V - limits average power dissipation during fault. |
| Programmable switching frequency | Supports 230kHz–2MHz via ROSC resistor - allows optimization for size (high-freq) vs. efficiency (low-freq) in different applications. |
| Integrated NPN power transistor | Eliminates need for external high-side switch; 2.6A current limit and 250mV typical VCE(SAT) reduce BOM count and conduction losses. |
| Thermally enhanced SOIC-8 EDP | Exposed pad lowers thermal resistance to 5.5°C/W junction-to-case - enables 2A operation at +85°C ambient with minimal copper area. |
Applications
| DSL/Cable Modem Power | Set-Top Box Core Supply |
|---|---|
Use Scenario: Powers downstream PHY ICs and analog front-end in ADSL2+/VDSL2 modems operating from 12V or 24V wall adapters. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering 3.3V/2A with tight line regulation (0.005%/V) across 12–28V input variation. Use Value: Programmable 1MHz switching enables compact 8.2µH inductor and 22µF ceramic output cap - reduces board area by >40% vs. 300kHz solutions. | Use Scenario: Supplies 1.2V/2A core voltage to MPEG decoder SoC in digital cable receivers with dynamic load steps up to 1.5A/µs. IC Role / Device Role / Timing Role: Step-down regulator with fast transient response due to peak current-mode architecture and 135ns minimum on-time. Use Value: Hiccup-mode protection prevents thermal runaway during SoC brown-out events; soft-start avoids output overshoot into sensitive logic rails. |
| Point-of-Load for DSPs | LCD TV Backlight Driver Bias |
Use Scenario: Generates 1.8V/2A for TI C6000 DSPs in industrial video analytics edge nodes powered from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency buck converter with 85% efficiency at 2A/12VIN→1.8VOUT, leveraging low VCE(SAT) and ceramic output caps. Use Value: 200kHz–2MHz frequency range allows trade-off between EMI filtering cost (lower freq) and component size (higher freq) per EMC requirements. | Use Scenario: Provides 5V/2A bias rail for LED driver ICs and microcontroller in 32-inch LCD TV main board with 28V input from PFC stage. IC Role / Device Role / Timing Role: Secondary buck regulator handling wide input (10–28V) from bulk capacitor; uses frequency foldback when FB <0.8V during backlight short. Use Value: Foldback reduces inductor current during hard shorts - limits peak stress on 20BQ030 Schottky diode and extends system reliability. |
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 rating, 260kHz fixed frequency, no frequency programming or hiccup mode. | Suitable for higher-current 5V rails but lacks programmability and advanced protection; requires larger inductor. | Choose LM2678SD-5.0/NOPB only if fixed 5V output and higher current are required, and frequency foldback is not needed. |
| TPS54227DDAR | 2.95–6V input, 2A, 700kHz fixed frequency, integrated MOSFETs, no NPN topology or BST pin. | Optimized for low-input-voltage systems (e.g., 5V bus); incompatible with 24V input without pre-regulator. | Select TPS54227DDAR for 5V-input point-of-load where high-side NMOS integration simplifies layout, but not for 24V direct conversion. |
Compared with LM2678SD-5.0/NOPB and TPS54227DDAR, SC4524ASETRT uniquely supports 3–28V input with programmable frequency and hiccup-mode protection - making it the only option among the three capable of direct 24V-to-3.3V/2A conversion in space-constrained CPE designs.
Availability
SC4524ASETRT is available at Aetrix Electronics and suitable for XDSL modems, set-top boxes, and point-of-load power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for SC4524ASETRT 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 analog and mixed-signal ICs for power management, protection, and signal integrity.
The SC4524ASETRT belongs to Semtech's SC45xx family of high-voltage buck regulators designed for telecom, broadband, and consumer electronics where wide input range, thermal robustness, and compact footprint are critical.
FAQ
What is the maximum input voltage rating for SC4524ASETRT?
The SC4524ASETRT has an absolute maximum input voltage rating of 32V, but its recommended operating range is 3V to 28V. Operation above 28V may trigger undervoltage lockout or cause premature thermal shutdown; sustained operation at 32V risks permanent damage per Absolute Maximum Ratings table.
How does the hiccup-mode protection work in SC4524ASETRT?
SC4524ASETRT enters hiccup mode when SS/EN voltage falls below 1.9V due to persistent overload. It shuts off the switch, discharges the soft-start capacitor with internal current sink, and restarts only after the capacitor drops below 1.0V - repeating this cycle to limit average power dissipation and prevent thermal runaway.
Can SC4524ASETRT operate with ceramic output capacitors?
Yes, SC4524ASETRT is fully compatible with ceramic output capacitors (e.g., 10–47µF X5R). Its peak current-mode control and Type-2 compensation design accommodate low-ESR ceramics; using Z5U or Y5V types is discouraged due to voltage/temperature coefficient instability affecting regulation accuracy.
What is the purpose of the BST pin on SC4524ASETRT?
The BST pin supplies boosted gate drive voltage to the internal NPN transistor's base. An external bootstrap diode and capacitor (e.g., 1N4148 + 0.1µF) connected between BST and SW generates ~VIN+1.8V, minimizing VCE(SAT) and maximizing efficiency - especially critical at high input voltages like 24V.
Is SC4524ASETRT lead-free and RoHS compliant?
Yes, SC4524ASETRT is fully RoHS and WEEE compliant per ordering note (2), supplied only in lead-free packaging, and rated for peak IR reflow temperature of 260°C - meeting JEDEC J-STD-020D moisture sensitivity level MSL3 requirements.
SC4524ASETRT 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):
- 28V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC, EDP
SC4524ASETRT FAQ
1.How can I place an order for SC4524ASETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4524ASETRT 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 SC4524ASETRT reliable?
The price and inventory of SC4524ASETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4524ASETRT is usually 5 days.
3.What payment methods are accepted for SC4524ASETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4524ASETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4524ASETRT?
SC4524ASETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4524ASETRT 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 SC4524ASETRT?
For technical support, including SC4524ASETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4524ASETRT requirements.
6.How does Aetrix verify that SC4524ASETRT is sourced from the original manufacturer or authorized distributors?
All SC4524ASETRT 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 SC4524ASETRT meets industry standards.
7.What is the process for return or replacement of SC4524ASETRT?
All SC4524ASETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4524ASETRT, 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 SC4524ASETRT part is unused and in its original packaging.
Return procedure for SC4524ASETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC4524ASETRT Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
