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Semtech Corporation SC2603ASKTRT
- Part No.:
- SC2603ASKTRT
- Manufacturer:
- Semtech Corporation
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6
- Datasheet:
-
SC2603ASKTRT.pdf
- Description:
- IC REG CTRLR BOOST SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,141
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Product details
Overview
SC2603ASKTRT from Semtech is a fixed-frequency voltage-mode PWM boost controller in SOT23-6 package, designed for compact DC/DC conversion with 200kHz switching, 1.25V reference accuracy (±2.5mV), 800mA gate drive, and integrated current-limit protection. It enables efficient 5–30V input to higher-voltage auxiliary supplies in space-constrained applications.
For engineers reviewing the SC2603ASKTRT datasheet, pinout, applications, or equivalent options, key selection criteria include its 200kHz oscillator with frequency-shift OCP, 73mV current-sense threshold, soft-start charge current of 60µA, and SOT23-6 thermal resistance (θJA = 165°C/W).
Technical Context
The SC2603ASKTRT implements voltage-mode control using an internal 1.25V temperature-compensated reference and triangle-wave oscillator. Its error amplifier is internally compensated, eliminating external compensation components.
It features pulse-by-pulse current limiting via the CS pin with 73mV threshold, frequency shift (to 50kHz) when FB falls below 0.625V, and UVLO with 4.5V turn-on and 400mV hysteresis - all operating across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200kHz fixed; balances efficiency, inductor size, and EMI in compact boost designs. |
| Reference Voltage | 1.250V ±2.5mV; enables precise output regulation via resistive feedback divider. |
| Current Sense Threshold | 73mV typical; sets peak switch current limit without external comparator. |
| GATE Drive Capability | 0.8A typical sink/source; directly drives medium-power MOSFETs like IRF7821. |
| Soft-Start Charge Current | 60µA; controls ramp rate of EN/SS capacitor to prevent inrush and overshoot. |
| UVLO Threshold | 4.5V with 400mV hysteresis; ensures clean startup and shutdown across wide input range. |
| Thermal Resistance θJA | 165°C/W; requires ≥1 in² copper pad for reliable operation at full load. |
Pinout & Package
SOT23-6 package with exposed thermal pad (land pattern per Semtech spec); 6-pin surface-mount footprint optimized for high-density PCB layouts and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Error amplifier inverting input | Connects to center tap of output voltage divider; regulates VOUT to 1.25V × (1 + R2/R4). |
| 2 GND | Power and signal ground reference | Must connect to isolated ground pad under IC; primary return path for gate drive and sense currents. |
| 3 EN/SS | Enable input / soft-start capacitor node | Pull low to disable; external capacitor sets startup ramp time via 60µA internal current source. |
| 4 GATE | PWM gate driver output | Drives N-channel MOSFET gate; 0.8A sink/source capability supports fast switching transitions. |
| 5 VIN | Main power input (4.5–16V) | Supplies internal circuitry; requires local 0.1µF ceramic decoupling; clamping diode needed above 16V. |
| 6 CS | Current sense input | Monitors differential voltage across external sense resistor; triggers OCP at 73mV. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated error amplifier | Eliminates need for external compensation network, reducing BOM count and layout sensitivity. |
| Frequency-shift over-current protection | Reduces switching frequency to 50kHz when FB < 0.625V, enabling graceful foldback during overload without latch-off. |
| Temperature-compensated 1.25V reference | Ensures stable output regulation across –40°C to +125°C, critical for industrial and automotive auxiliary supplies. |
| Integrated soft-start with 60µA current source | Allows precise control of output voltage ramp using a single external capacitor; prevents inrush into large output capacitors. |
| SOT23-6 RoHS/WEEE-compliant package | Enables ultra-compact designs (< 3mm × 3mm footprint) while meeting environmental compliance requirements. |
Applications
| Portable Devices | Flat Panel TV |
|---|---|
Use Scenario: Boosting single-cell Li-ion (3.0–4.2V) to 5V/9V for USB peripherals or display backlight drivers. IC Role / Device Role / Timing Role: Primary PWM controller regulating output voltage via FB feedback loop; operates continuously at 200kHz. Use Value: Enables >90% efficiency in sub-1cm² area using only six external components - critical for battery runtime and thermal management. | Use Scenario: Generating 24V/1A auxiliary supply from 12V main rail for audio amplifiers or tuner modules. IC Role / Device Role / Timing Role: Fixed-frequency boost controller with frequency-shift OCP; handles transient load steps up to 1A without shutdown. Use Value: Delivers stable 24V output with <0.5% line/load regulation, supporting noise-sensitive analog circuits in display subsystems. |
| TV Set Top Box | Industrial Power Supply |
Use Scenario: Providing isolated 12V bias for HDMI PHY or remote control receiver circuitry from 5V standby rail. IC Role / Device Role / Timing Role: Always-on auxiliary regulator; leverages EN/SS pin for controlled wake-up sequencing. Use Value: Achieves <6mA quiescent current in shutdown mode and fast 5ms soft-start response - essential for low-power standby compliance. | Use Scenario: Generating 15V/0.5A sensor excitation supply in programmable logic controllers with wide input range (5–30V). IC Role / Device Role / Timing Role: Robust DC/DC controller with UVLO hysteresis and thermal-aware layout guidance for harsh environments. Use Value: Maintains regulation across 4.5–16V input with 150°C max junction rating and validated PCB land pattern for reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Higher 500kHz switching frequency; lower 1.23V reference (±1.5%); no frequency-shift OCP. | Better suited for ultra-small inductors but less tolerant of sustained overload conditions. | Choose TPS61040DRVR when board space is more constrained than thermal budget and overload behavior is managed externally. |
| MAX1706ESA+ | Fixed 1.25V reference (±0.5%); includes built-in MOSFET; 500kHz frequency; no soft-start pin. | Reduces component count but limits flexibility in gate drive strength and external FET selection. | Choose MAX1706ESA+ when integration priority outweighs need for discrete MOSFET optimization or adjustable soft-start timing. |
Compared with TPS61040DRVR and MAX1706ESA+, the SC2603ASKTRT offers superior thermal robustness (165°C/W θJA with defined land pattern), frequency-shift OCP for graceful overload handling, and dedicated EN/SS pin for sequenced power-up - making it optimal for industrial and set-top box auxiliary supplies where reliability trumps minimal footprint.
Availability
SC2603ASKTRT is available at Aetrix Electronics and suitable for portable devices, flat panel TV auxiliary supplies, and industrial power supply designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SC2603ASKTRT 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 focused on high-performance analog and mixed-signal ICs for power management, RF, and sensing applications.
The SC2603ASKTRT belongs to Semtech's SC26xx family of cost-optimized PWM controllers, engineered specifically for compact, high-efficiency DC/DC boost conversion in consumer and industrial auxiliary power rails.
FAQ
What is the maximum input voltage rating for the SC2603ASKTRT?
The SC2603ASKTRT has an absolute maximum VIN-to-GND rating of 20V. However, its recommended operating input voltage range is 4.5V to 16V. When input exceeds 16V, a Zener clamp diode (≤15V) must be placed at the VIN pin per Semtech's Figure 1 application schematic to protect the IC. This limitation is due to internal circuitry voltage tolerances, not package constraints.
Does the SC2603ASKTRT require external compensation components?
No, the SC2603ASKTRT does not require external compensation components. Its error amplifier is internally compensated, as confirmed in the "Features" section and "Applications Information" of the official datasheet. This eliminates the need for external RC networks on the COMP or FB pins, simplifying design and improving stability across temperature and process variation.
How does the frequency-shift over-current protection work in the SC2603ASKTRT?
The SC2603ASKTRT reduces switching frequency from 200kHz to 50kHz when the FB pin voltage drops below half the reference voltage (i.e., <0.625V). This occurs during sustained overload or short-circuit conditions and is implemented via internal oscillator reconfiguration - not a latch-off. The SC2603ASKTRT continues switching at reduced frequency to limit power dissipation while maintaining regulation attempt.
What is the purpose of the CS pin on the SC2603ASKTRT?
The CS pin on the SC2603ASKTRT is the current sense input used for pulse-by-pulse over-current protection. It monitors the differential voltage across an external sense resistor (or PCB trace) connected between the power switch source and ground. When this voltage reaches 73mV (typical), the SC2603ASKTRT immediately disables the GATE output for that cycle, limiting peak switch current without requiring external comparators.
Can the SC2603ASKTRT be used in a flyback or SEPIC topology?
No, the SC2603ASKTRT is specifically designed and characterized for boost converter topologies only. Its block diagram, pin functions (e.g., GATE driving high-side N-MOSFET), and application schematics exclusively show boost configurations. It lacks the control architecture, isolation interfaces, or transformer drive capabilities required for flyback or SEPIC operation - using it in those topologies is unsupported and may result in failure.
SC2603ASKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 16V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SC2603ASKTRT FAQ
1.How can I place an order for SC2603ASKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC2603ASKTRT 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 SC2603ASKTRT reliable?
The price and inventory of SC2603ASKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC2603ASKTRT is usually 5 days.
3.What payment methods are accepted for SC2603ASKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC2603ASKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC2603ASKTRT?
SC2603ASKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC2603ASKTRT 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 SC2603ASKTRT?
For technical support, including SC2603ASKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC2603ASKTRT requirements.
6.How does Aetrix verify that SC2603ASKTRT is sourced from the original manufacturer or authorized distributors?
All SC2603ASKTRT 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 SC2603ASKTRT meets industry standards.
7.What is the process for return or replacement of SC2603ASKTRT?
All SC2603ASKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC2603ASKTRT, 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 SC2603ASKTRT part is unused and in its original packaging.
Return procedure for SC2603ASKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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