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Semtech Corporation SC2442H
- Part No.:
- SC2442H
- Manufacturer:
- Semtech Corporation
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SC2442H.pdf
- Description:
- IC REG CTRLR BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,923
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Product details
Overview
SC2442H from Semtech is a high-performance dual synchronous buck controller IC designed for point-of-load DC/DC conversion. It supports 4.75V to 36V input, delivers two independent regulated outputs down to 0.75V, operates up to 1.1MHz, and features out-of-phase switching to reduce input ripple in telecom and embedded power systems.
For engineers reviewing the SC2442H datasheet, pinout, applications, or equivalent options, key selection considerations include its wide VIN range (up to 36V), TSSOP-24 package with bootstrapped high-side gate drivers, dual soft-start, hiccup-mode overcurrent protection, and external frequency synchronization via ROSC.
Technical Context
The SC2442H implements two independent current-mode synchronous buck controllers with separate error amplifiers (EA1/EA2), feedback inputs (FB1/FB2), and soft-start pins (SS1/SS2). Each channel uses cycle-by-cycle input-side current sensing via OC1/OC2 and supports asynchronous startup with power-up sequencing to prevent latch-ups.
Its architecture includes dedicated high-side (GD1H/GD2H) and low-side (GD1L/GD2L) gate drivers with 0.5A drive capability, bootstrap supplies (BST1/BST2), and phase nodes (PH1/PH2) for external N-channel MOSFETs. The internal oscillator (set by ROSC) runs at twice the converter switching frequency, enabling precise timing control and external synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 36V - supports industrial and automotive input rails without pre-regulation |
| Output Voltage Min | 0.75V - enables direct regulation for modern low-voltage ASICs and FPGAs |
| Max Switching Frequency | 1.1MHz - allows compact magnetics and fast transient response |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and industrial ambient conditions |
| Package | TSSOP-24 - surface-mount footprint with thermal pad for efficient power dissipation |
| Gate Drive Current | ±0.5A per driver - sufficient to rapidly charge/discharge high-Q MOSFET gates |
| Current Sense Threshold | 105mV - sets precise cycle-by-cycle overcurrent limit on input rail |
Pinout & Package
SC2442H is housed in a thermally enhanced 24-pin TSSOP package with exposed thermal pad. Pin numbering follows standard top-view orientation; AGND and PGND are separated for analog/digital noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVCC | Analog supply input | Regulated 7V reference for internal analog circuitry; powered externally via PNP transistor |
| VIN | Main power input | Primary input rail (4.75–36V); powers PVCC and feeds current-sense resistor |
| FB1 / FB2 | Feedback inputs | Resistive divider nodes for closed-loop regulation of each output voltage |
| GD1H / GD2H | High-side gate drivers | Bootstrapped outputs driving external N-MOSFET sources; require BSTx capacitors |
| GD1L / GD2L | Low-side gate drivers | Ground-referenced outputs driving N-MOSFET sources directly |
| SS1 / SS2 | Soft-start control | Capacitor-connected pins controlling ramp rate and sequencing of each converter |
| SYNC/EN | Enable & sync input | Active-high enable; accepts TTL-level external clock for frequency synchronization |
| ROSC | Oscillator programming | Resistor-to-ground sets internal clock frequency (Fc = 33,000 / ROSC kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase operation | Reduces input ripple amplitude by ~50%, allowing fewer/smaller input capacitors |
| Dual independent soft-start | Prevents inrush current and ensures controlled power-up sequencing between outputs |
| Hiccup-mode overcurrent protection | Disables PWM and discharges SS pins during sustained overload, enabling self-recovery |
| Bootstrapped high-side drive | Enables use of efficient N-channel MOSFETs on high-side without external charge pumps |
| Separate AVCC/PVCC supplies | Isolates sensitive analog references from noisy power-switching paths for improved stability |
Applications
| DSL Power Management | Cable Modem PSU |
|---|---|
Use Scenario: DSL line cards requiring isolated 3.3V and 1.8V rails from a 5–12V input bus. IC Role / Device Role / Timing Role: Dual synchronous buck controller managing independent voltage domains with tight transient response. Use Value: Out-of-phase switching cuts input capacitor count by 30% versus single-phase designs; 1.1MHz operation shrinks inductor size by >40%. | Use Scenario: Cable modem front-end powering RF, baseband, and memory subsystems. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering stable 3.3V/1.2V outputs with hiccup-mode fault recovery. Use Value: Wide 4.75–36V input accommodates varying upstream power sources; –40°C to +125°C rating ensures reliability in unventilated enclosures. |
| Mixed-Signal SoC Supply | Industrial PoL Converter |
Use Scenario: FPGA or DSP board needing clean, sequenced 1.2V core and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Dual-channel controller with independent soft-start and feedback loops for rail coordination. Use Value: Separate EA1/EA2 and FB1/FB2 allow optimized compensation per rail; 0.75V minimum output supports next-gen low-VDD cores. | Use Scenario: Programmable logic controller (PLC) module converting 24V industrial bus to 5V/3.3V system rails. IC Role / Device Role / Timing Role: Robust buck controller handling high-line transients and EMI-sensitive environments. Use Value: Input UVLO (4.5V–4.6V hysteresis) prevents brownout instability; TSSOP-24 thermal pad sustains 12W dissipation at 125°C ambient. |
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 |
|---|---|---|---|
| MP8765GQ-Z | Single-chip dual buck with integrated MOSFETs; max VIN = 28V; no external ROSC programming | Lower BOM count but limited to ≤28V input and fixed 500kHz–2MHz range | Choose MP8765GQ-Z when board space is critical and input stays below 28V |
| LTC3728CUHF#PBF | Higher VIN (6–36V), supports external MOSFETs, but only one controller channel with dual-phase interleaving | Requires two LTC3728s for true dual-output independence; lacks hiccup-mode protection | Choose LTC3728CUHF#PBF when interleaved high-current single-rail design is preferred |
Compared with MP8765GQ-Z and LTC3728CUHF#PBF, the SC2442H uniquely combines true dual independent controllers, 36V input tolerance, programmable 100kHz–1.1MHz frequency, and hiccup-mode fault recovery-making it optimal for multi-rail industrial and broadband equipment where flexibility and robustness are prioritized over integration density.
Availability
SC2442H is available at Aetrix Electronics and suitable for DSL power management, cable modem PSUs, mixed-signal SoC supplies, and industrial point-of-load converters requiring stable component supply across extended temperature and input voltage ranges.
Supply support for SC2442H 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 SC2442H belongs to Semtech's high-efficiency DC/DC controller product line, engineered specifically for multi-output, wide-input industrial and broadband communication power systems demanding precision regulation and rugged fault handling.
FAQ
What is the maximum input voltage supported by the SC2442H?
The SC2442H supports a maximum input voltage of 36V, as explicitly specified in the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables. This 36V rating distinguishes it from the standard SC2442 (30V max) and enables use in 24V industrial bus and automotive battery-supplied applications where transient spikes exceed 30V. The VIN pin must remain within this absolute limit to avoid permanent damage.
Does the SC2442H integrate MOSFET drivers for both high-side and low-side switches?
Yes, the SC2442H integrates dedicated high-side (GD1H/GD2H) and low-side (GD1L/GD2L) gate drivers capable of ±0.5A peak current. These drivers are designed to interface directly with external N-channel MOSFETs: high-side drivers use bootstrap capacitors (BST1/BST2) referenced to PH1/PH2, while low-side drivers are ground-referenced. No external driver ICs are required for standard implementations.
How is the switching frequency set on the SC2442H?
The SC2442H switching frequency is set via an external resistor (ROSC) connected from the ROSC pin to AGND. The internal clock frequency Fc equals 33,000 / ROSC (with Fc in kHz and ROSC in kΩ); the actual converter switching frequency is Fc / 2. For example, a 60kΩ ROSC resistor yields Fc = 550kHz and a 275kHz switching frequency. This allows precise tuning from ~100kHz to 1.1MHz.
What protection features does the SC2442H provide against overcurrent conditions?
The SC2442H provides cycle-by-cycle overcurrent protection using input-side current sensing. When the voltage across the input sense resistor exceeds 105mV, the PWM pulse is latched off until the next clock cycle. Under sustained overload, it enters hiccup mode: GDxH/GDxL go low, and SSx pins sink 2μA to discharge soft-start capacitors until voltage drops to 1V, then resume sourcing 10μA for restart. This protects both MOSFETs and inductors.
Can the SC2442H be synchronized to an external clock source?
Yes, the SC2442H supports external clock synchronization via the SYNC/EN pin. When a TTL-compatible square wave with frequency slightly higher than the internal ROSC-set frequency is applied to SYNC/EN, the internal oscillator locks to that external signal. This eliminates beat frequencies in multi-converter systems and enables deterministic timing across distributed power rails-critical in synchronized RF or data acquisition systems using the SC2442H.
SC2442H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
SC2442H FAQ
1.How can I place an order for SC2442H through Aetrix?
Please submit a Request for Quotation (RFQ) for SC2442H 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 SC2442H reliable?
The price and inventory of SC2442H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC2442H is usually 5 days.
3.What payment methods are accepted for SC2442H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC2442H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC2442H?
SC2442H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC2442H 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 SC2442H?
For technical support, including SC2442H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC2442H requirements.
6.How does Aetrix verify that SC2442H is sourced from the original manufacturer or authorized distributors?
All SC2442H 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 SC2442H meets industry standards.
7.What is the process for return or replacement of SC2442H?
All SC2442H units undergo pre-shipment inspection (PSI). If there is an issue with SC2442H, 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 SC2442H part is unused and in its original packaging.
Return procedure for SC2442H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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