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Vishay Siliconix SIP12108DB
- Part No.:
- SIP12108DB
- Manufacturer:
- Vishay Siliconix
- Package:
- Datasheet:
-
SIP12108DB.pdf
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- EVAL BOARD FOR SIP12108
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Product details
Overview
SiP12108DB from Vishay Siliconix is a monolithic 5 A synchronous buck regulator with integrated high-side and low-side MOSFETs, operating from 2.8 V to 5.5 V input and delivering adjustable output down to 0.6 V. It employs current-mode constant-on-time (CM-COT) control, achieves 95 % peak efficiency at 2 MHz, and supports programmable switching frequency up to 4 MHz. It is used in point-of-load regulation for FPGAs, DSPs, and network processors.
For engineers reviewing the SiP12108DB datasheet, SiP12108DB pinout, SiP12108DB application, or SiP12108DB equivalent, key selection considerations include its CM-COT architecture for ultrafast transient response, ±1 % VOUT accuracy, integrated OVP/OTP/SCP protection, PGOOD indicator, and QFN16-33G package thermal performance.
Technical Context
The SiP12108DB implements a current-mode constant-on-time (CM-COT) PWM controller with internal 0.6 V reference, transconductance error amplifier (gm = 1 mS), and valley-current sensing via RDS(on). Its on-time is set by an external RON resistor, enabling precise frequency programming from 0.2 MHz to 4 MHz without requiring ESR-stabilized output capacitors.
It integrates full protection logic including pulse-by-pulse overcurrent limit (7.5 A typ.), output overvoltage protection (21 % above 0.6 V), thermal shutdown (160 °C typ. with 30 °C hysteresis), and - uniquely in the base SiP12108 (not SiP12108A) - output undervoltage latching protection triggered at VFB < 0.45 V for >20 μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.8 V to 5.5 V - supports direct connection to common system rails (3.3 V, 5 V) without pre-regulation. |
| Output current | 5 A continuous - sufficient for mid-power FPGA cores or dual-core application processors. |
| Output voltage | Adjustable down to 0.6 V - enables regulation of modern low-voltage I/O and core supplies (e.g., 1.2 V, 0.9 V). |
| Switching frequency | Programmable up to 4 MHz - allows compact magnetics and fast transient response; typical design uses 1–2 MHz. |
| Efficiency | 95 % peak - achieved at 2 MHz with optimized internal MOSFETs (RON_HS = 35 mΩ, RON_LS = 23 mΩ). |
| VFB accuracy | ±1 % over -40 °C to +85 °C - ensures tight output regulation across industrial temperature range. |
| Protection features | OVP, OTP, SCP, PGOOD - eliminates need for external monitoring circuitry in most embedded designs. |
Pinout & Package
SiP12108DB is housed in a lead-free, power-enhanced QFN16-33G package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad. The package supports high thermal conductivity when soldered to a multi-layer PCB with four thermal vias under the EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 (VIN) | Power input for MOSFET stage | Connects directly to main input rail (2.8–5.5 V); must be decoupled near package. |
| 2 (AVIN) | Bias supply for control circuitry | Independent 2.8–5.5 V supply; enables UVLO (2.55 V typ.) and soft-start initiation. |
| 3 (EN) | Enable control input | Logic-high (>1.5 V) enables regulation; logic-low (<0.4 V) disables with controlled shutdown. |
| 4 (RON) | On-time programming node | Resistor to GND sets fixed on-time and thus switching frequency (e.g., 105 kΩ → 1 MHz). |
| 5 (AUTO) | Mode selection | Tied to AVIN for forced CCM; tied to GND for diode-emulation PSM mode improving light-load efficiency. |
| 6 (PGOOD) | Open-drain power-good indicator | Asserts high when VFB is within ±12.5 % / +21 % window of 0.6 V; requires external pull-up. |
| 7 (GMO) | Compensation and droop node | Connects to RC network for loop stability; also enables current-sharing in parallel configurations. |
| 8 (AGND) | Analog ground reference | Separate ground for feedback and control circuitry; must be star-connected to minimize noise coupling. |
| 9 (VFB) | Feedback input | Senses output via resistor divider; internal 0.6 V reference enables precise VOUT setting (VO = 0.6 × (1 + R1/R2)). |
| 10 (VOUT) | Output voltage sense | Direct connection to regulated output node; improves load regulation accuracy vs. remote sensing. |
| 11–13 (LX) | Switch node | High-current path to external inductor; requires low-inductance layout and thermal relief. |
| 14–15 (PGND) | Power ground return | Low-impedance return for MOSFET currents; must be separated from AGND and joined at single point. |
| EP (Exposed Pad) | Thermal and electrical ground | Must be soldered to PCB thermal plane with ≥4 vias; provides primary thermal path and reduces RθJA to 36.3 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| CM-COT control architecture | Delivers ultrafast transient response without external compensation networks; stable with any capacitor type (no ESR requirement). |
| Integrated power MOSFETs | Optimized RON_HS = 35 mΩ / RON_LS = 23 mΩ enable 95 % peak efficiency at 2 MHz and reduce BOM count. |
| Selectable operation mode | AUTO pin configures forced continuous conduction mode (CCM) or power-save mode (PSM) with diode emulation and frequency foldback. |
| Full fault protection suite | Includes pulse-by-pulse OCP (7.5 A), latchable UVP (SiP12108 only), OVP (+21 %), OTP (160 °C), and UVLO with hysteresis. |
| PGOOD open-drain output | Provides system-level power sequencing and health monitoring with ±12.5 % / +21 % VFB window detection. |
Applications
| Point-of-Load for FPGA Core Rails | Industrial IoT Edge Node Power |
|---|---|
Use Scenario: Regulating 1.2 V core supply for Xilinx Artix-7 FPGA in a space-constrained PLC module. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 5 A peak current with sub-100 μs load-step response. Use Value: CM-COT architecture minimizes output capacitance (3 × 22 μF MLCC) while maintaining <120 mV undershoot during 0→5 A step. |
Use Scenario: Powering ARM Cortex-M7 microcontroller, RS-485 transceiver, and sensor interface in a DIN-rail mounted gateway. IC Role / Device Role / Timing Role: Single-chip DC/DC solution replacing discrete controller + MOSFETs, reducing footprint by >40 %. Use Value: Integrated OTP and OVP eliminate need for external thermal sensors or crowbar circuits, simplifying safety certification. |
| Networking ASIC Supply | Test & Measurement Instrumentation |
Use Scenario: Generating 0.85 V supply for Broadcom BCM56xx switch ASIC in 1U rack-mounted switch. IC Role / Device Role / Timing Role: High-density POL regulator operating at 2 MHz to avoid interference with 10G Ethernet clock domains. Use Value: Programmable RON-based frequency tuning enables precise EMI spectrum placement and compliance with CISPR 32 Class A limits. |
Use Scenario: Providing clean, low-noise 3.3 V supply for high-resolution ADC front-end in portable oscilloscope. IC Role / Device Role / Timing Role: Low-ripple buck converter with PSM disabled (AUTO = AVIN) to maintain fixed 1.2 MHz switching for predictable noise floor. Use Value: ±1 % VFB accuracy and 0.6 V reference ensure <±33 mV output tolerance over temperature, critical for 16-bit measurement accuracy. |
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, 2.5–5.5 V input, fixed 500 kHz fSW, no UVP, lower integration (external bootstrap cap required) | Lacks latchable UVP and PGOOD; less suitable for safety-critical or tightly sequenced systems | Lower-cost option where 4 A output and basic protection suffice; requires additional external components. |
| TPS54560QDGQRQ1 | 5 A, 3.5–60 V input, adjustable fSW (100 kHz–2.5 MHz), external MOSFETs, automotive-grade (-40 °C to +125 °C) | Wider VIN range and AEC-Q100 qualification; higher BOM count and larger solution size | Preferred for automotive or high-input-voltage industrial applications where extended temperature and reliability are mandatory. |
Compared with MP2315DJ-LF-Z and TPS54560QDGQRQ1, the SiP12108DB delivers higher integration (integrated MOSFETs, PGOOD, UVP), superior light-load efficiency via PSM, and smaller 3 mm × 3 mm footprint - making it optimal for compact, high-performance consumer and telecom POL designs.
Availability
SiP12108DB is available at Aetrix Electronics and suitable for point-of-load regulation, FPGA core supplies, and industrial edge node power conversion requiring stable component supply, consistent parametric performance, and long-term production support.
Supply support for SiP12108DB 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-efficiency power management ICs and ruggedized MOSFET technologies.
The SiP12108DB belongs to Vishay's SiP (System-in-Package) power regulator family, designed specifically for high-density, low-voltage POL applications in computing, networking, and industrial electronics where minimal footprint and fast transient response are critical.
FAQ
What is the key difference between SiP12108DB and SiP12108ADB?
The SiP12108DB corresponds to the standard SiP12108 variant, which includes output undervoltage protection (UVP) that latches the device off if VFB falls below 0.45 V for >20 μs. The SiP12108ADB is the "A" version, which omits UVP functionality entirely. All other specifications - including 5 A rating, CM-COT control, PGOOD, OVP, and OTP - are identical between SiP12108DB and SiP12108ADB.
Does SiP12108DB require an external bootstrap capacitor?
No, SiP12108DB does not require an external bootstrap capacitor. Its integrated high-side MOSFET driver uses an internal charge pump, eliminating the need for external bootstrap components. This simplifies layout, reduces BOM count, and improves reliability compared to controllers requiring external bootstrap networks.
How is switching frequency programmed on SiP12108DB?
Switching frequency on SiP12108DB is set by connecting an external resistor (RON) between the RON pin and PGND. The on-time is fixed per RON value using TON = RON × K (K = 10.45 pF), and fSW ≈ VOUT / (TON × VIN). For example, a 105 kΩ resistor yields ~1 MHz at 1.2 VOUT / 3.3 VIN. Frequency ranges from 0.2 MHz to 4 MHz depending on RON choice.
Can SiP12108DB operate with ceramic output capacitors only?
Yes, SiP12108DB is explicitly designed to be stable with any capacitor type - including all-ceramic (MLCC) output banks - and requires no external ESR network. Its CM-COT architecture and internal compensation eliminate traditional ESR dependency, allowing use of low-ESR, high-frequency ceramics (e.g., 3 × 22 μF X5R) without risk of oscillation or poor transient response.
What thermal performance can be expected from SiP12108DB in a standard 4-layer PCB?
With proper layout - including soldering the exposed thermal pad (EP) to an internal ground plane using ≥4 thermal vias - SiP12108DB achieves a junction-to-ambient thermal resistance (RθJA) of 36.3 °C/W. At 5 A load and 25 °C ambient, this results in ~127 °C junction temperature, well below the 150 °C max rating. Derating is recommended above 85 °C ambient.
SIP12108DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- microBUCK®
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 1.8V
- Voltage - Input:
- 5A
- Regulator Topology:
- 2.8V ~ 5.5V
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- SiP12108
SIP12108DB FAQ
1.How can I place an order for SIP12108DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SIP12108DB 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 SIP12108DB reliable?
The price and inventory of SIP12108DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SIP12108DB is usually 5 days.
3.What payment methods are accepted for SIP12108DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIP12108DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIP12108DB?
SIP12108DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIP12108DB 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 SIP12108DB?
For technical support, including SIP12108DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIP12108DB requirements.
6.How does Aetrix verify that SIP12108DB is sourced from the original manufacturer or authorized distributors?
All SIP12108DB 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 SIP12108DB meets industry standards.
7.What is the process for return or replacement of SIP12108DB?
All SIP12108DB units undergo pre-shipment inspection (PSI). If there is an issue with SIP12108DB, 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 SIP12108DB part is unused and in its original packaging.
Return procedure for SIP12108DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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