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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Vishay Siliconix SI9140DQ-T1-E3

Name: SI9140DQ-T1-E3
Brand: Vishay Siliconix
SKU: SI9140DQ-T1-E3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI9140DQ-T1-E3

Manufacturer:: Vishay Siliconix

Category:: DC DC Switching Controllers

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: SI9140DQ-T1-E3.pdf

Description:: IC REG CTRLR BUCK 16TSSOP

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Product details

Overview

SI9140DQ-T1-E3 from Vishay Siliconix is a high-frequency synchronous buck controller IC designed for point-of-load regulation of high-performance microprocessors. It operates from 3–6.5 V input, delivers adjustable output voltage via external feedback, supports >1 MHz switching (up to 2 MHz), features 1.5 V ±1.5% internal reference, and integrates dual CMOS gate drivers (DR/DS) with break-before-make timing. It is used in desktop PC CPU power supplies requiring tight transient regulation under 10-A load steps.

For engineers reviewing the SI9140DQ-T1-E3 datasheet, SI9140DQ-T1-E3 pinout, SI9140DQ-T1-E3 application, or SI9140DQ-T1-E3 equivalent, key selection considerations include its 100-kHz closed-loop bandwidth, voltage-mode control architecture, TSSOP-16 package with −40°C to +85°C operating range, and compatibility with Si4435DY/Si4410DY MOSFETs in synchronous buck topologies.

Technical Context

The SI9140DQ-T1-E3 implements voltage-mode PWM control with a 25-MHz unity-gain bandwidth error amplifier and 100-kHz feedback loop bandwidth-enabling sub-5-µs transient response to 10-A load steps. Its oscillator frequency is externally programmable (20 kHz–2 MHz) via ROSC (5 kΩ–250 kΩ) and COSC (47 pF–200 pF), with f_OSC ≈ 0.75/(ROSC × COSC) at V_DD = 5 V.

It integrates dual high-current gate drivers: DR (n-channel driver, −380 mA sink / −260 mA source) and DS (p-channel driver, 200–300 mA sink / −380 mA source), with 40 ns break-before-make timing. The IC includes UVLO (1.2 V threshold with 175 mV hysteresis), VGOOD open-drain comparator, and 2000-V HBM ESD rating.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3 V to 6.5 V - supports single-rail 5-V input systems without auxiliary bias supply.
Reference Voltage	1.5 V ±1.5% - enables precise output setting (e.g., 2.5 V, 2.9 V, 3.3 V) with external resistor divider on FB/NI pins.
Max Switching Frequency	2 MHz - allows use of ultra-low-profile inductors (<1.5 µH) and reduces output capacitance by >50% vs. 250-kHz converters.
Error Amp GBW	25 MHz - ensures stable 100-kHz closed-loop bandwidth with wide phase margin using two-pole compensation.
Driver Peak Current	±380 mA (DR/DS) - directly drives paralleled Si4410DY/Si4435DY MOSFETs without external buffers.
Operating Temp Range	−40°C to +85°C - qualified for industrial-grade motherboard and embedded computing environments.
Package	TSSOP-16 - surface-mount, lead-free (RoHS-compliant), 4.4 mm × 5.0 mm footprint with 0.65 mm pitch.

Pinout & Package

TSSOP-16 package (4.4 mm × 5.0 mm, 0.65 mm pitch), thermally enhanced with exposed pad (PGND-connected). Pin 1 marked by dot; pin numbering follows standard counter-clockwise orientation.

Pin/Terminal	Circuit Role	Design Meaning
VDD (Pin 1)	Logic supply input	Powers internal logic, error amp, oscillator; requires 0.1 µF bypass to PGND.
MON (Pin 2)	Voltage-good monitor input	Non-inverting input of VGOOD comparator; connects to output voltage divider for regulation monitoring.
VGOOD (Pin 3)	Open-drain power-good flag	Asserts low when MON < VREF; requires external pull-up for processor reset signaling.
COMP (Pin 4)	Error amplifier output	Drives PWM comparator; connects to FB via RC network for loop stability (100-kHz bandwidth).
FB (Pin 5)	Inverting error amp input	Feedback node for output voltage sensing; sets regulation point with external R-divider from VOUT.
NI (Pin 6)	Non-inverting error amp input	Connects to VREF (1.5 V) or external precision reference for improved accuracy.
VREF (Pin 7)	Internal reference output	1.5 V ±1.5% source capable of 1 mA; used as NI reference or external DAC reference.
GND (Pin 8)	Analog ground	Reference for analog blocks; must be star-connected to PGND near IC.
ENABLE (Pin 9)	Logic enable input	Active-high (VENH = 0.8×VDD); places IC in standby (250 µA I_DD) when low.
ROSC (Pin 10)	Oscillator timing resistor	Connects to GND; sets oscillator charge current (5 kΩ–250 kΩ range).
COSC (Pin 11)	Oscillator timing capacitor	Connects to GND; sets oscillator frequency with ROSC (47–200 pF).
UVLOSET (Pin 12)	UVLO threshold input	Triggers shutdown if voltage drops below 1.2 V; 175 mV hysteresis prevents chatter.
PGND (Pin 13)	Power ground return	High-current return path for VS supply and MOSFET sources; connects to exposed thermal pad.
DS (Pin 14)	P-channel MOSFET driver	CMOS push-pull output; high in standby, drives Si4435DY gate with break-before-make timing.
DR (Pin 15)	N-channel MOSFET driver	CMOS push-pull output; low in standby, drives Si4410DY gate with synchronized timing.
VS (Pin 16)	Driver supply input	Powers DS/DR outputs; requires local 0.1 µF bypass to PGND; same as VDD or separate rail.

Key Features

Feature	Design Value
Voltage-mode PWM control	Eliminates current-sense resistor loss (≈1 W at 10 A), improves efficiency by 3.5% vs. current-mode designs.
100-kHz closed-loop bandwidth	Reduces required output capacitance by ≥50% versus 25–50 kHz competitors, cutting board area and BOM cost.
Dual high-current gate drivers	±380 mA peak drive capability directly interfaces with Si4435DY/Si4410DY without buffer stages or gate resistors.
Programmable 20 kHz–2 MHz f_OSC	Enables optimization: high f_OSC for space-constrained designs; low f_OSC for battery-powered efficiency.
Integrated VGOOD comparator	Provides processor-ready signal with 10 mV hysteresis and 45 mV offset, eliminating need for external supervisor IC.

Applications

Desktop CPU Core Power Supply	Laptop Processor VRM
Use Scenario: Regulating 2.5 V/2.9 V/3.3 V for Intel Pentium III/IV or AMD Athlon processors in ATX motherboards with 0–10 A dynamic load. IC Role / Device Role / Timing Role: Primary PWM controller managing synchronous buck stage, providing 100-kHz loop bandwidth and <5 µs transient recovery. Use Value: Enables use of only three 330-µF OS-CON capacitors instead of 6–10 for equivalent performance, reducing PCB area by 35%.	Use Scenario: Point-of-load conversion for mobile CPU cores in space-constrained laptop mainboards with thermal limits. IC Role / Device Role / Timing Role: High-efficiency buck controller driving Si4410DY/Si4435DY MOSFETs in continuous conduction mode across full load range. Use Value: Maintains >90% efficiency at 8.5 A (VIN = 5 V, VOUT = 2.5 V), avoiding thermal throttling during burst workloads.
GTL+ Bus Power (1.5 V)	Embedded Microprocessor Supply
Use Scenario: Generating tightly regulated 1.5 V for GTL+ signaling bus in server chipset power domains. IC Role / Device Role / Timing Role: Precision reference-based controller with 1.5 V ±1.5% VREF and 15 mV error amp offset enabling ±1.5% output tolerance. Use Value: Meets GTL+ bus spec (1.5 V ±0.075 V) without external trimming, simplifying validation and production test.	Use Scenario: Powering ARM-based SoCs in industrial gateways requiring −40°C to +85°C operation and long-term supply continuity. IC Role / Device Role / Timing Role: Industrial-qualified buck controller with UVLO hysteresis (175 mV) and 2000-V ESD protection for harsh environments. Use Value: Eliminates need for external ESD diodes or UVLO supervisors, reducing component count by 3–4 parts per rail.

Desktop CPU Core Power Supply

Laptop Processor VRM

Use Scenario: Regulating 2.5 V/2.9 V/3.3 V for Intel Pentium III/IV or AMD Athlon processors in ATX motherboards with 0–10 A dynamic load.

IC Role / Device Role / Timing Role: Primary PWM controller managing synchronous buck stage, providing 100-kHz loop bandwidth and <5 µs transient recovery.

Use Value: Enables use of only three 330-µF OS-CON capacitors instead of 6–10 for equivalent performance, reducing PCB area by 35%.

Use Scenario: Point-of-load conversion for mobile CPU cores in space-constrained laptop mainboards with thermal limits.

IC Role / Device Role / Timing Role: High-efficiency buck controller driving Si4410DY/Si4435DY MOSFETs in continuous conduction mode across full load range.

Use Value: Maintains >90% efficiency at 8.5 A (VIN = 5 V, VOUT = 2.5 V), avoiding thermal throttling during burst workloads.

GTL+ Bus Power (1.5 V)

Embedded Microprocessor Supply

Use Scenario: Generating tightly regulated 1.5 V for GTL+ signaling bus in server chipset power domains.

IC Role / Device Role / Timing Role: Precision reference-based controller with 1.5 V ±1.5% VREF and 15 mV error amp offset enabling ±1.5% output tolerance.

Use Value: Meets GTL+ bus spec (1.5 V ±0.075 V) without external trimming, simplifying validation and production test.

Use Scenario: Powering ARM-based SoCs in industrial gateways requiring −40°C to +85°C operation and long-term supply continuity.

IC Role / Device Role / Timing Role: Industrial-qualified buck controller with UVLO hysteresis (175 mV) and 2000-V ESD protection for harsh environments.

Use Value: Eliminates need for external ESD diodes or UVLO supervisors, reducing component count by 3–4 parts per rail.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6208IRZ-T	Voltage-mode controller with 1.25 V reference, 0.5–1.5 MHz f_OSC, SOIC-16 package, no integrated VGOOD comparator.	Requires external voltage supervisor; lower reference accuracy (±1.5% vs. SI9140DQ-T1-E3's ±1.5% at 25°C, ±2.3% over temp).	Preferred where board space permits SOIC and external supervision is acceptable.
TPS51116PWR	Current-mode controller with integrated MOSFET drivers, 0.6 V reference, 300–600 kHz f_OSC, TSSOP-24 package.	Fixed 0.6 V reference limits flexibility; lower switching frequency increases inductor/capacitor size; higher pin count.	Selected for cost-sensitive designs where 600 kHz operation suffices and 0.6 V output is required.

Compared with ISL6208IRZ-T and TPS51116PWR, the SI9140DQ-T1-E3 offers superior transient response due to its 100-kHz bandwidth and voltage-mode architecture, while its 1.5 V reference and integrated VGOOD simplify design for multi-voltage microprocessor rails without adding components.

Availability

SI9140DQ-T1-E3 is available at Aetrix Electronics and suitable for desktop motherboard power delivery, laptop VRMs, GTL+ bus regulation, and industrial embedded microprocessor supplies requiring stable component supply and long-lifecycle support.

Supply support for SI9140DQ-T1-E3 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 computing, industrial, and automotive markets.

The Si9140 product line was engineered specifically for high-frequency, high-transient-response point-of-load buck conversion in next-generation microprocessor power supplies, emphasizing minimal external component count and board area reduction.

FAQ

What is the maximum supported switching frequency for the SI9140DQ-T1-E3?

The SI9140DQ-T1-E3 supports up to 2 MHz switching frequency, set by external ROSC (5 kΩ–250 kΩ) and COSC (47 pF–200 pF) components. At V_DD = 5 V, f_OSC ≈ 0.75/(ROSC × COSC). This high-frequency capability enables compact magnetics and reduced output capacitance in SI9140DQ-T1-E3-based designs.

Does the SI9140DQ-T1-E3 require an external current-sense resistor?

No, the SI9140DQ-T1-E3 uses voltage-mode control and does not require an external current-sense resistor. Its error amplifier compares FB voltage to VREF, eliminating sense-resistor power loss (≈1 W at 10 A) and improving system efficiency-key to SI9140DQ-T1-E3's adoption in high-current microprocessor supplies.

What is the purpose of the MON and VGOOD pins on the SI9140DQ-T1-E3?

MON (Pin 2) is the non-inverting input of the VGOOD comparator, connected to the output voltage divider. VGOOD (Pin 3) is an open-drain output that pulls low when MON voltage falls below VREF, signaling undervoltage to the processor. This integrated function replaces external supervisors in SI9140DQ-T1-E3 implementations.

Can the SI9140DQ-T1-E3 drive both high-side and low-side MOSFETs directly?

Yes-the SI9140DQ-T1-E3 integrates dual CMOS gate drivers: DS (Pin 14) drives external p-channel MOSFETs like Si4435DY, and DR (Pin 15) drives n-channel MOSFETs like Si4410DY. Each delivers ±380 mA peak current, enabling direct drive without buffer stages in SI9140DQ-T1-E3 synchronous buck designs.

What temperature range is specified for the SI9140DQ-T1-E3?

The SI9140DQ-T1-E3 is rated for −40°C to +85°C operation (D Suffix), making it suitable for industrial and extended-temperature computing environments. This range is validated per Vishay's qualification standards and applies to all electrical specifications in the SI9140DQ-T1-E3 datasheet.

SI9140DQ-T1-E3 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: -

Package/Case:: 16-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:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 3V ~ 6.5V

Frequency - Switching:: 20kHz ~ 2MHz

Duty Cycle (Max):: -

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Frequency Control

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

SI9140DQ-T1-E3 FAQ

1.How can I place an order for SI9140DQ-T1-E3 through Aetrix?

Please submit a Request for Quotation (RFQ) for SI9140DQ-T1-E3 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 SI9140DQ-T1-E3 reliable?

The price and inventory of SI9140DQ-T1-E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI9140DQ-T1-E3 is usually 5 days.

3.What payment methods are accepted for SI9140DQ-T1-E3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9140DQ-T1-E3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI9140DQ-T1-E3?

SI9140DQ-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI9140DQ-T1-E3 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 SI9140DQ-T1-E3?

For technical support, including SI9140DQ-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9140DQ-T1-E3 requirements.

6.How does Aetrix verify that SI9140DQ-T1-E3 is sourced from the original manufacturer or authorized distributors?

All SI9140DQ-T1-E3 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 SI9140DQ-T1-E3 meets industry standards.

7.What is the process for return or replacement of SI9140DQ-T1-E3?

All SI9140DQ-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9140DQ-T1-E3, 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 SI9140DQ-T1-E3 part is unused and in its original packaging.

Return procedure for SI9140DQ-T1-E3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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