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SC470ITSTRT
Semtech
IC REG CTRLR BUCK 14TSSOP
16004 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 14-TSSOP
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Minimum 1
Minimum 1
5.0 / 5.0
- (297 Ratings)
SC470ITSTRT
Product Overview
5889846
DiGi Electronics Part Number
SC470ITSTRT-DGManufacturer
Semtech
SC470ITSTRT
Description
IC REG CTRLR BUCK 14TSSOPInventory
16004 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 14-TSSOP
Quantity
Minimum 1
Minimum 1
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SC470ITSTRT Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
-
Series
-
Product Status
Obsolete
Output Type
Transistor Driver
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
4.5V ~ 5.5V
Frequency - Switching
-
Duty Cycle (Max)
-
Synchronous Rectifier
Yes
Clock Sync
No
Serial Interfaces
-
Control Features
Current Limit, Enable, On Time Control, Power Good
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
14-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
14-TSSOP
Base Product Number
SC470
Datasheet & Documents
HTML Datasheet
SC470ITSTRT-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8542.31.0001
Additional Information
Other Names
SC470ITSTR
SC470ITSDKR
SC470ITSCT
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
The staff at Di Digi Electronics always follow up to ensure my orders have arrived in good condition and meet my expectations.
December 02, 2025
Visiting DiGi Electronics is always a good experience due to their straightforward pricing.
December 02, 2025
Their timely customer support has made our procurement process much smoother.
December 02, 2025
I highly value their quick and friendly customer support, which enhances my confidence in their brand.
December 02, 2025
Every interaction with DiGi Electronics reinforces my trust in their brand.
December 02, 2025
The packaging design is both practical and environmentally conscious.
December 02, 2025
The packaging not only protects the items well but also looks sleek and premium.
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Frequently Asked Questions (FAQ)
Can the SC470ITSTRT be used as a drop-in replacement for the LTC1703 in a high-temperature industrial power supply design?
The SC470ITSTRT is not a direct drop-in replacement for the LTC1703 due to differences in control architecture and pin functionality. While both are synchronous buck controllers, the SC470ITSTRT uses on-time control (similar to constant-on-time modulation) and requires a bias voltage within its 4.5V–5.5V Vcc range, which the LTC1703 may not provide directly in all configurations. Additionally, the SC470ITSTRT has a different enable threshold and power-good behavior. In high-temperature environments near 125°C, ensure adequate PCB thermal relief as the SC470ITSTRT lacks clock synchronization to shift switching noise—this could interfere with sensitive analog circuits sharing the same board. Always verify external MOSFET drive strength and bootstrap capacitor recharge timing when retrofitting with the SC470ITSTRT.
What are the key reliability risks when designing with the SC470ITSTRT in a long-lifecycle medical device given its obsolete status?
Using the SC470ITSTRT in a long-lifecycle medical device poses significant supply chain risks due to its obsolete status. While current stock is available, long-term availability cannot be guaranteed, increasing end-of-life (EOL) management complexity. To mitigate risk, design with second-source compatibility in mind—ensure external components (MOSFETs, inductors, feedback dividers) are shared with newer controllers like the TI LM5118 or Analog Devices LTC3891 that support similar on-time control. Also, lock in lifetime buys and verify the MSL 1 rating supports reflow processes without moisture-related failures. Consider implementing a modular power stage layout to simplify future controller replacements.
How does the on-time control scheme of the SC470ITSTRT affect transient response in fast load-step applications like DSP core supplies?
The SC470ITSTRT's on-time control provides fast line regulation but can exhibit slower load transient response compared to current-mode controllers due to its reliance on output voltage droop to increase switching frequency. In DSP core applications with rapid load steps, this can cause extended recovery time and increased voltage deviation. To compensate, use low-ESR ceramic output capacitors with sufficient bulk capacitance near the load to minimize ΔV during transients. Avoid excessively large inductors that limit current slew rate, and ensure the feedback divider has minimal parasitic capacitance to preserve loop responsiveness. Simulating the loop with actual PCB parasitics is recommended.
What practical design constraints limit the minimum duty cycle when using the SC470ITSTRT in a 48V to 3.3V industrial power conversion?
In a 48V to 3.3V step-down application, the SC470ITSTRT's minimum controllable on-time limits the practical minimum duty cycle, potentially causing loss of regulation at high input voltages. The device’s architecture assumes a fixed on-time inversely proportional to input voltage, but internal delays restrict how short the pulse can be. This risks pulse skipping or output voltage rise under light loads. To maintain regulation, verify the required on-time (t_on ≈ Vout / (VIN × fSW)) is above the effective minimum—typically 50–70ns in real designs. If not, reduce switching frequency or consider an intermediate 12V rail. Also, ensure bootstrap capacitor voltage remains sufficient for high-side gate drive during extended off periods.
How should I evaluate external MOSFETs for the SC470ITSTRT in a high-efficiency 20A telecom power stage to avoid thermal runaway?
When selecting MOSFETs for a 20A power stage using the SC470ITSTRT, prioritize low gate charge (Qg) and low Rds(on) while balancing conduction and switching losses. The SC470ITSTRT provides a fixed 5V gate drive; ensure the high-side MOSFET’s gate threshold (Vgs(th)) is well below 2V to prevent incomplete turn-on. Use a low-side MOSFET with fast body diode or parallel Schottky to reduce reverse recovery losses. To avoid thermal runaway, match current sharing across parallel FETs with symmetrical layout and individual gate resistors. Monitor junction temperature during load transients—use thermal vias under the exposed pad and avoid routing high-current traces beneath the controller. Derate MOSFETs at 125°C ambient to account for the SC470ITSTRT’s maximum junction rating.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
SC470ITSTRT CAD Models
Semtech SC470ITSTRT PCB symbols & footprints
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