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Vishay Siliconix SIP12117DB
- Part No.:
- SIP12117DB
- Manufacturer:
- Vishay Siliconix
- Package:
- Datasheet:
-
SIP12117DB.pdf
- Description:
- EVAL BOARD FOR SIP12117
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Product details
Overview
SiP12117DB from Vishay Siliconix is a 3 A, 4.5 V–15 V input current-mode constant-on-time (CM-COT) synchronous buck regulator with integrated high-side and low-side MOSFETs in a 3 mm × 3 mm DFN10-33C package. It delivers adjustable output down to 0.6 V at 600 kHz switching frequency, features built-in soft start (2.9 ms typ.), cycle-by-cycle overcurrent protection, and power-good signaling - optimized for graphics cards, notebook computers, and SSD/HDD power rails.
For engineers reviewing the SiP12117DB datasheet, SiP12117DB pinout, SiP12117DB application, or SiP12117DB equivalent, this page provides verified technical context, validated pin functions, confirmed CM-COT transient response behavior, real-world thermal pad layout guidance, and two rigorously cross-checked alternative regulators for 3 A step-down designs requiring fast load-step response and minimal external components.
Technical Context
The SiP12117DB implements a current-mode constant-on-time control architecture that uses valley-current sensing and internal ramp compensation to achieve ultrafast transient response without requiring output capacitor ESR. Its fixed 600 kHz switching frequency is maintained across load and input voltage variations via adaptive off-time adjustment.
Power stage integration includes an 85 mΩ high-side and 55 mΩ low-side n-channel MOSFET pair, enabling up to 95% peak efficiency. Protection logic incorporates cycle-by-cycle OCP (4.25 A typ. valley current threshold), overtemperature shutdown at 145 °C (35 °C hysteresis), and input UVLO with 2.8 V rising threshold and 550 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 15 V - supports wide-input industrial and computing rails without pre-regulation |
| Output Voltage Range | Adjustable from 0.6 V to 5.5 V - enables core voltage regulation for modern SoCs and FPGAs |
| Continuous Output Current | 3 A - sufficient for GPU memory rails and CPU I/O domains |
| Switching Frequency | Fixed 600 kHz - balances EMI performance, inductor size, and efficiency |
| Feedback Reference Voltage | 600 mV ±12 mV (25 °C), ±15 mV (–40 °C to +85 °C) - sets output accuracy and resistor-divider design margin |
| Shutdown Current | < 5 μA typ. - enables ultra-low-power system standby states |
| Soft Start Time | 2.9 ms typ. - prevents inrush current and ensures monotonic VOUT ramp-up |
Pinout & Package
The SiP12117DB is housed in a lead (Pb)-free 3 mm × 3 mm DFN10-33C package with exposed thermal pad (AGND) for enhanced thermal dissipation. Package height is 0.9 mm, and thermal resistance from junction-to-ambient is 36.3 °C/W under standard JEDEC conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Monitors output voltage via resistor divider; 0.6 V reference sets VOUT = 0.6 V × (1 + RTOP/RBOTTOM) |
| 2 VCC | Internal bias regulator output | Supplies gate driver and control circuitry; requires local 1 μF ceramic decoupling |
| 3 VIN | Main power input | Accepts 4.5–15 V; connects to input capacitors and feeds integrated MOSFETs |
| 4,5 PGND | Power ground return | Low-impedance return path for high di/dt switching currents; must be connected to thermal pad |
| 6,7 LX | Switching node | Connects to inductor; carries full AC switching waveform; requires tight layout to minimize EMI |
| 8 BOOT | Bootstrap supply | Requires ≥100 nF capacitor between BOOT and LX to generate floating gate drive for high-side MOSFET |
| 9 PGOOD | Open-drain power-good signal | Asserts high when VOUT is within ±10% of target; pulls low during fault or startup |
| 10 EN | Enable control | Active-high logic input; enable above 1.5 V, disable below 0.4 V; must not float |
| Pad AGND | Analog ground & thermal slug | Primary thermal path; must be soldered to large PCB copper area and connected to PGND at single point |
Key Features
| Feature | Design Value |
|---|---|
| Integrated compensation | Eliminates external Type-II/III compensation network - reduces BOM count and layout sensitivity |
| Ultrafast transient response | Sub-10 μs undershoot recovery (0 A → 3 A load step) due to CM-COT architecture and valley-current sensing |
| Diode emulation mode | Disables low-side FET at zero-crossing to eliminate reverse conduction losses in light-load conditions |
| Pre-bias startup support | Prevents negative output spikes by inhibiting switching if FB voltage exceeds internal soft-start ramp at power-on |
| Thermal pad package | DFN10-33C with exposed AGND pad enables >2 W power dissipation in compact 3 mm × 3 mm footprint |
Applications
| Graphics Cards | Set-Top Boxes |
|---|---|
Use Scenario: Powering GDDR6 memory subsystems requiring stable 1.35 V at up to 3 A with fast dynamic load response. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator delivering tightly regulated voltage directly to memory ICs. Use Value: CM-COT architecture maintains <50 mV undershoot during 0→3 A GPU memory access bursts, eliminating need for oversized bulk capacitance. | Use Scenario: Supplying 3.3 V to SoC peripherals and HDMI PHY circuitry in cost-sensitive consumer media devices. IC Role / Device Role / Timing Role: Secondary buck converter generating clean, low-noise auxiliary rail from main 12 V supply. Use Value: Integrated MOSFETs and fixed 600 kHz operation reduce solution size to <100 mm² while meeting CISPR-32 conducted EMI limits. |
| LCD TVs | Notebook Computers |
Use Scenario: Generating 5 V for TCON (timing controller) and backlight LED drivers in mid-size displays. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 12 V to 5 V with <100 mW no-load power draw. Use Value: Diode emulation and adaptive frequency scaling achieve >85% efficiency at 10 mA load, extending standby battery life. | Use Scenario: Regulating 1.05 V core voltage for Intel/AMD mobile processors during burst workloads. IC Role / Device Role / Timing Role: Fast-transient POL regulator synchronized to processor DVFS events via EN pin sequencing. Use Value: 2.9 ms soft start and power-good output enable precise power-rail sequencing with host EC firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4 A rated, 500 kHz fixed frequency, no integrated compensation - requires external RC network | Higher current headroom but larger solution size; lacks PGOOD and pre-bias startup | Choose when >3 A continuous load or lower-cost BOM outweighs layout simplicity and advanced protection features |
| TPS54332DDAR | 3 A, 2.95–6 V input, current-mode PWM (not COT), 500 kHz–2.5 MHz adjustable frequency | Lower input voltage range; requires external bootstrap capacitor and compensation; no diode emulation | Prefer when operating from 5 V rail or needing programmable frequency for EMI tuning - not suitable for 12 V input systems |
Compared with MP2315DJ-LF-Z and TPS54332DDAR, the SiP12117DB offers superior transient response and smaller total solution size due to its CM-COT architecture, integrated compensation, and thermal-pad DFN package - making it optimal for space-constrained, fast-dynamic applications like graphics and mobile computing.
Availability
SiP12117DB is available at Aetrix Electronics and suitable for graphics card power delivery, notebook computer VRMs, and SSD/HDD auxiliary rails requiring stable component supply, rapid prototyping turnaround, and long-term production continuity.
Supply support for SiP12117DB 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
Vishay Siliconix is a global leader in discrete semiconductors and passive components, specializing in high-reliability power management solutions for automotive, industrial, and computing markets.
The SiP12117DB belongs to Vishay's microBUCK product line - monolithic synchronous buck regulators engineered for high power density, fast transient response, and simplified design in space- and performance-critical applications.
FAQ
What is the maximum recommended input voltage for the SiP12117DB?
The SiP12117DB has an absolute maximum input voltage rating of 16 V, but its recommended operating range is 4.5 V to 15 V. Operation at 15 V is fully supported per datasheet specifications, including thermal performance and reliability testing. Exceeding 15 V may trigger UVLO hysteresis or compromise long-term reliability - always maintain design margin below the 16 V absolute limit. The SiP12117DB's internal MOSFETs and gate drivers are characterized for stable operation across this full 4.5–15 V window.
Does the SiP12117DB support pre-bias startup, and how does it behave?
Yes, the SiP12117DB supports pre-bias startup. During power-on, the device monitors the FB pin voltage against its internal soft-start ramp. If the sensed FB voltage exceeds the ramp level - indicating a pre-charged output - the control logic disables both high-side and low-side FET switching to prevent reverse current flow or output voltage collapse. This behavior is explicitly verified in the datasheet's Operational Description section and ensures safe operation when powering downstream circuits already holding residual charge. The SiP12117DB resumes normal regulation only after the FB voltage falls below the ramp threshold.
What is the purpose of the AGND thermal pad on the SiP12117DB package?
The AGND thermal pad on the SiP12117DB serves dual functions: it acts as the analog ground reference for feedback and control circuitry, and it provides the primary thermal conduction path from the silicon die to the PCB. Per Vishay's layout guidelines, this pad must be soldered to a dedicated copper pour connected to PGND at a single point (≥1 mm width) to ensure both low-noise grounding and effective heat dissipation. Failure to properly connect the pad degrades thermal performance (increasing junction temperature by >20 °C at 3 A) and may cause instability in the feedback loop. The SiP12117DB's 36.3 °C/W RθJA rating assumes full thermal pad implementation.
Can the SiP12117DB operate in discontinuous conduction mode (DCM) at light loads?
Yes, the SiP12117DB automatically enters diode emulation mode at light loads, effectively operating in a controlled form of discontinuous conduction. When inductor valley current crosses zero, the low-side FET turns off to prevent reverse conduction. As load decreases further, switching frequency scales downward - down to hundreds of Hz - to minimize switching losses while maintaining output regulation and ripple within specification. This behavior is inherent to its CM-COT architecture and is confirmed in the datasheet's Light Load Operation section. The SiP12117DB does not require external mode-select pins or configuration to enable this feature.
What is the typical overcurrent protection threshold for the SiP12117DB?
The SiP12117DB features cycle-by-cycle overcurrent protection triggered by inductor valley current sensing. Its typical OCP threshold is 4.25 A, with a minimum of 3.6 A and maximum of 5.1 A across temperature and process variation. Protection activates immediately after VIN rises above UVLO and EN is asserted, skipping high-side pulses and holding the low-side FET on until valley current falls below the threshold. This value is measured at the MOSFET RDS(on) and accounts for ripple current effects - for example, at 3 A DC load with 1.2 A ripple, valley current is 2.4 A, well below the 4.25 A trip point. The SiP12117DB's OCP is fully characterized and guaranteed per Electrical Specifications table on page 4 of the datasheet.
SIP12117DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 0.6V ~ 5.5V
- Voltage - Input:
- 3A
- Regulator Topology:
- 4.5V ~ 15V
- Frequency - Switching:
- Buck
- Contents:
- 600kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- SIP12117
SIP12117DB FAQ
1.How can I place an order for SIP12117DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SIP12117DB 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 SIP12117DB reliable?
The price and inventory of SIP12117DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SIP12117DB is usually 5 days.
3.What payment methods are accepted for SIP12117DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIP12117DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIP12117DB?
SIP12117DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIP12117DB 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 SIP12117DB?
For technical support, including SIP12117DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIP12117DB requirements.
6.How does Aetrix verify that SIP12117DB is sourced from the original manufacturer or authorized distributors?
All SIP12117DB 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 SIP12117DB meets industry standards.
7.What is the process for return or replacement of SIP12117DB?
All SIP12117DB units undergo pre-shipment inspection (PSI). If there is an issue with SIP12117DB, 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 SIP12117DB part is unused and in its original packaging.
Return procedure for SIP12117DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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