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Semtech Corporation SC2442ITSTR
- Part No.:
- SC2442ITSTR
- Manufacturer:
- Semtech Corporation
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SC2442ITSTR.pdf
- Description:
- IC REG CTRLR BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,350
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Product details
Overview
SC2442ITSTR from Semtech is a dual synchronous buck controller IC for high-efficiency point-of-load DC/DC conversion, supporting input voltage range of 4.75V to 30V, output down to 0.75V per channel, programmable switching frequency up to 1.1 MHz, and operation across –40°C to +125°C ambient temperature. It drives two independent N-channel MOSFET pairs in out-of-phase mode to reduce input ripple in DSL, cable modem, and mixed-signal power management systems.
For engineers reviewing the SC2442ITSTR datasheet, pinout, applications, or equivalent options, key selection considerations include its dual-channel asynchronous startup, individual soft-start control, input-side current sensing with hiccup-mode overcurrent protection, bootstrapped high-side gate drive capability (≥0.5A), and TSSOP-24 package compatibility with thermal and noise-sensitive industrial embedded designs.
Technical Context
The SC2442ITSTR implements two independent voltage-mode synchronous buck controllers sharing a single clock generator, with each channel featuring dedicated error amplifiers (EA1/EA2), feedback inputs (FB1/FB2), soft-start pins (SS1/SS2), and current-limit detection via OC1/OC2. Its architecture supports out-of-phase operation (180° phase shift) to minimize input capacitor RMS current and enables external synchronization via the SYNC/EN pin.
It integrates separate analog (AVCC/AGND) and power (PVCC/PGND) supply domains, bootstrapped high-side drivers (BST1/BST2 → GD1H/GD2H), low-side drivers (GD1L/GD2L), and a VCC regulator interface using an external PNP transistor controlled by the BDI pin. The ROSC pin sets the internal clock frequency (Fc = 33,000 / ROSC kHz), where Fc = 2 × converter switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 30V - Supports wide industrial input rails including 5V, 12V, and 24V systems without pre-regulation. |
| Output Voltage Minimum | 0.75V - Enables direct regulation for modern low-voltage digital cores (e.g., 1.8V, 1.2V, 0.9V). |
| Max Switching Frequency | 1.1 MHz - Allows use of small, low-profile inductors (e.g., <1 µH) and ceramic output capacitors. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive ancillary, industrial PLC, and telecom equipment environments. |
| Gate Drive Current | ≥0.5A source/sink per driver - Sufficient to rapidly charge/discharge Qg of medium-power N-MOSFETs (e.g., FDS6982S) with <100 ns dead time. |
| Current Sense Threshold | 105 mV on OC1/OC2 - Enables precise cycle-by-cycle input-current limiting using non-inductive sense resistors. |
| Soft-Start Control | 10 µA internal current source into SS1/SS2 - Provides programmable ramp time (e.g., 100 ms with 10 nF) for controlled output rise without inrush. |
Pinout & Package
TSSOP-24 package (4.4 mm × 7.8 mm, 0.65 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free, tape-and-reel packaging (2500 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVCC | Analog supply input | Provides regulated 7V bias for internal analog circuitry; requires external PNP regulator when VIN > 8V. |
| BDI | Base drive input | Sinks ≥3 mA to bias external PNP transistor for AVCC regulation; left floating if VIN ≤ 8V. |
| VIN | Main power input | Primary input rail (4.75–30V); powers PVCC domain and feeds input-current sense path. |
| OC1 / OC2 | Current sense comparator input | Accepts differential voltage from input-side sense resistor; triggers hiccup-mode current limit at 105 mV. |
| FB1 / FB2 | Feedback input | Resistive divider input for closed-loop regulation; reference = 0.75V ±1.5% (70% of 0.75V = 0.525V hiccup threshold). |
| SS1 / SS2 | Soft-start control | Capacitor-based ramp node; clamps EA outputs during startup; 10 µA charge / 2 µA discharge current. |
| BST1 / BST2 | Bootstrap supply | Connects to ceramic capacitor between PHx and BSTx to generate floating gate drive voltage for high-side N-MOSFETs. |
| GD1H / GD2H | High-side gate driver output | Drives gate of high-side N-MOSFET; ≥0.5A peak current, 100 ns minimum dead time enforced. |
| GD1L / GD2L | Low-side gate driver output | Drives gate of low-side N-MOSFET; same drive strength and timing constraints as high-side outputs. |
| PH1 / PH2 | Phase node connection | Switch node connecting high/low-side MOSFETs; connects to BSTx capacitor and inductor input. |
| PVCC | Power supply input | Supplies gate drivers; derived from AVCC or directly from VIN if ≤8V; decoupled with ≥0.22 µF ceramic. |
| SYNC/EN | Enable & sync input | Logic-level enable (1.8V high / 1V low); accepts TTL-compatible external clock for frequency synchronization. |
| ROSC | Oscillator frequency set | Resistor-to-AGND sets internal clock (Fc = 33,000 / ROSC kHz); Fc = 2 × converter switching frequency. |
| AGND / PGND | Analog & power ground | Separate ground returns isolate noise-sensitive analog circuits from high di/dt power paths. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces input capacitor RMS current by ~30% vs. in-phase, enabling fewer/smaller bulk capacitors. |
| Asynchronous startup mode | Prevents output overshoot and latch-up by holding GDxH/GDxL low until AVCC ≥4.6V and SSx ≥1.5V. |
| Hiccup-mode overcurrent protection | Disables PWM and discharges SSx at 2 µA upon sustained FBx < 0.525V, then auto-restarts after SSx drops to 1V. |
| Separate AVCC/PVCC domains | Improves noise immunity: analog circuitry referenced to AVCC/AGND; gate drivers referenced to PVCC/PGND. |
| Programmable 100 kHz–1.1 MHz switching | Enables optimization for efficiency (lower fSW) or size (higher fSW) without changing external components. |
| Input-side current sensing | Avoids MOSFET Rds(on) drift errors; supports accurate current limiting across temperature and process variation. |
Applications
| DSL Line Card Power | Cable Modem SoC Supply |
|---|---|
Use Scenario: Dual-rail power delivery for ADSL2+ line card ASICs requiring isolated 3.3V I/O and 1.8V core rails from a 5–12V backplane. IC Role / Device Role: Dual synchronous buck controller managing independent voltage regulation, sequencing, and transient response for mixed-signal processing blocks. Use Value: Out-of-phase operation reduces input ripple, allowing smaller 10 µF input caps instead of 47 µF; hiccup-mode prevents thermal runaway during short-circuit faults on either rail. |
Use Scenario: Compact, high-density power solution for DOCSIS 3.0 cable modems integrating RF front-end, QAM demodulator, and ARM-based host processor. IC Role / Device Role: Primary DC/DC controller delivering tightly regulated 1.2V CPU core and 3.3V peripheral rails from a 12V input, with fast load-step response. Use Value: 1.1 MHz operation enables sub-1 µH inductors and 22 µF ceramic output caps per rail, reducing board area by >40% versus 300 kHz alternatives. |
| Mixed-Signal Test Equipment | Industrial PLC I/O Module |
Use Scenario: Precision analog front-end (AFE) and FPGA logic partitioning in automated test equipment requiring ultra-low-noise 2.5V ADC reference and 1.0V FPGA core supplies. IC Role / Device Role: Dual-channel controller with separate AGND/PGND and soft-start isolation ensures clean startup without digital noise coupling into sensitive analog sections. Use Value: Dedicated EA1/EA2 amplifiers and FB1/FB2 inputs allow independent loop compensation for each rail's dynamic load profile, maintaining <1% output deviation during 10–100% step loads. |
Use Scenario: DIN-rail mounted programmable logic controller module operating in harsh factory environments with wide ambient temperature swings (–25°C to +70°C). IC Role / Device Role: Robust dual-buck controller powering 5V logic and 3.3V communication interface (RS-485, CAN) from unregulated 24V DC field bus. Use Value: –40°C to +125°C rating and input UVLO (4.5V–4.6V hysteresis) ensure reliable cold-start and brownout recovery in industrial settings with fluctuating supply quality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual controller with integrated MOSFET drivers only; no external PNP VCC regulator support; max VIN = 28V. | Lacks BDI-controlled AVCC regulation, limiting use in >8V input systems requiring tight VCC stability. | Preferred for space-constrained designs where integrated drivers suffice and input stays ≤28V. |
| LTC3855EUHF#PBF | Two-phase interleaved controller with current-mode control, 500 kHz–900 kHz range, and integrated LDO for VCC; max VIN = 38V. | Supports higher input voltage and offers better current matching between phases but lacks hiccup-mode OCP. | Chosen when precise phase current balance and wider VIN range outweigh need for hiccup fault recovery. |
Compared with MP2918GL-Z and LTC3855EUHF#PBF, the SC2442ITSTR uniquely combines programmable high-frequency operation (up to 1.1 MHz), input-side current sensing with hiccup-mode protection, and flexible external VCC regulation-making it optimal for thermally constrained, high-transient industrial and broadband communications applications where reliability under overload is critical.
Availability
SC2442ITSTR is available at Aetrix Electronics and suitable for DSL line cards, cable modems, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for SC2442ITSTR 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 semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, protection, and signal integrity.
The SC2442ITSTR belongs to Semtech's Power Management Products Division, designed specifically for high-efficiency, multi-rail DC/DC conversion in broadband communications and industrial embedded systems demanding robust thermal performance and precise load regulation.
FAQ
What is the maximum input voltage supported by the SC2442ITSTR?
The SC2442ITSTR supports a maximum input voltage of 30V, as specified in its absolute maximum ratings and electrical characteristics tables. This 4.75V to 30V input range enables direct operation from common industrial and telecom supply rails such as 5V, 12V, and 24V without intermediate pre-regulation stages. Exceeding 30V may cause permanent damage.
Does the SC2442ITSTR support external frequency synchronization?
Yes, the SC2442ITSTR supports external frequency synchronization via the SYNC/EN pin. When a TTL-compatible clock signal with frequency marginally higher than the internally set oscillator frequency is applied to this pin, the internal oscillator synchronizes to the external source. This feature enables system-level clock alignment and eliminates beat frequencies in multi-converter systems.
How does the SC2442ITSTR implement overcurrent protection?
The SC2442ITSTR implements cycle-by-cycle overcurrent protection using input-side current sensing. When the voltage across the external sense resistor exceeds 105 mV, the PWM pulse is latched off until the next clock cycle. Under sustained overload, it enters hiccup mode: GDxH/GDxL are disabled, and the SSx pin sinks 2 µA to discharge its capacitor until reaching 1V, then resumes sourcing 10 µA to restart.
What is the purpose of the BDI pin on the SC2442ITSTR?
The BDI (Base Drive Input) pin on the SC2442ITSTR provides ≥3 mA of sink current to bias an external PNP transistor used for regulating the AVCC supply to 7V. This configuration allows stable analog circuit operation across wide input ranges (>8V). When VIN ≤ 8V, the BDI pin may be left unconnected and VIN can directly power AVCC and PVCC.
Can the SC2442ITSTR operate with only one output enabled?
Yes, the SC2442ITSTR supports independent channel control. Each buck channel has dedicated enable paths: ENA functionality is implemented via the SYNC/EN pin (global enable), while individual soft-start and regulation are managed through SS1/FB1/EA1 and SS2/FB2/EA2. Disabling one channel (e.g., by grounding SS1) does not affect the other channel's operation or regulation accuracy.
SC2442ITSTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.75V ~ 30V
- Frequency - Switching:
- 1.1MHz
- Duty Cycle (Max):
- 94%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SC2442ITSTR FAQ
1.How can I place an order for SC2442ITSTR through Aetrix?
Please submit a Request for Quotation (RFQ) for SC2442ITSTR 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 SC2442ITSTR reliable?
The price and inventory of SC2442ITSTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC2442ITSTR is usually 5 days.
3.What payment methods are accepted for SC2442ITSTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC2442ITSTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC2442ITSTR?
SC2442ITSTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC2442ITSTR 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 SC2442ITSTR?
For technical support, including SC2442ITSTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC2442ITSTR requirements.
6.How does Aetrix verify that SC2442ITSTR is sourced from the original manufacturer or authorized distributors?
All SC2442ITSTR 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 SC2442ITSTR meets industry standards.
7.What is the process for return or replacement of SC2442ITSTR?
All SC2442ITSTR units undergo pre-shipment inspection (PSI). If there is an issue with SC2442ITSTR, 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 SC2442ITSTR part is unused and in its original packaging.
Return procedure for SC2442ITSTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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