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

Analog Devices Inc. LTC3711EGN#TRPBF

Name: LTC3711EGN#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3711EGN#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3711EGN#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 24-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC3711EGN#TRPBF.pdf

Description:: IC REG CTRLR BUCK 24SSOP

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Product details

Overview

LTC3711EGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller designed for CPU power delivery in mobile computing platforms. It features 5-bit VID-programmable output voltage (0.925V–2.000V), valley current mode control without external sense resistor, 4V–36V input range, <100ns minimum on-time, and ±1% 0.8V reference. It drives dual N-channel MOSFETs for high-efficiency regulation in Pentium®-based notebook and palmtop systems.

For engineers reviewing the LTC3711EGN#TRPBF datasheet, LTC3711EGN#TRPBF pinout, LTC3711EGN#TRPBF application, or LTC3711EGN#TRPBF equivalent, key selection criteria include its no-RSENSE valley current sensing architecture, programmable active voltage positioning, forced continuous/discontinuous mode control via FCB pin, and compatibility with Intel mobile VID specifications for dynamic core voltage scaling.

Technical Context

The LTC3711EGN#TRPBF implements a valley current-mode control architecture using an internal one-shot timer to set top-MOSFET on-time based on ION current and VON voltage inputs. Its error amplifier adjusts ITH voltage to regulate output by comparing VOSENSE-derived feedback against a precision 0.8V reference, with gain set by external compensation at ITH.

Fault protection includes foldback current limiting, ±7.5% PGOOD window monitoring, output overvoltage shutdown (M1 off/M2 latched on), and optional short-circuit shutdown timer. Power sequencing is enabled via RUN/SS pin with programmable soft-start using external capacitor CSS.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	0.925V to 2.000V, set by 5-bit VID code per Intel mobile specification - enables dynamic CPU core voltage scaling.
Input Voltage Range	4V to 36V - supports wide-input industrial and mobile adapter supplies without external pre-regulation.
Minimum On-Time	<100ns - enables high step-down ratios (e.g., 24V→1.5V) at practical switching frequencies without dropout.
Reference Accuracy	±1% at 0.8V - ensures tight output regulation across temperature and line/load conditions.
Switching Frequency	Adjustable via external R_ON resistor - maintains stable operation across VIN/VOUT variations using valley-current timing.
Current Sense Method	No external R_SENSE required - uses bottom MOSFET R_DS(ON) or optional sense resistor, reducing BOM cost and conduction loss.
Operating Temperature	–40°C to +85°C (ambient) - qualified for extended-temperature notebook, PDA, and embedded computing environments.

Pinout & Package

Package: 24-lead narrow SSOP (GN), 0.15mm max height, JEDEC MS-013AC compliant. Thermal resistance θ_JA = 130°C/W.

Pin/Terminal	Circuit Role	Design Meaning
VID0–VID4 (Pins 1,12,13,23,24)	Digital voltage identification inputs	Set internal DAC output to program 0.925V–2.000V in 25mV steps - directly compatible with Intel mobile processor VID protocols.
RUN/SS (Pin 2)	Enable and soft-start control	Pull below 0.8V for shutdown; external capacitor sets ramp time (~3s/µF) and overcurrent latchoff delay - enables controlled power-up sequencing.
ITH (Pin 7)	Error amplifier output & current threshold	Voltage (0–2.4V) sets valley current limit; also serves as compensation node - allows Type II/III loop compensation with external RC network.
VOSENSE (Pin 11)	Output voltage feedback input	Connects to resistive divider from VOUT - interfaces with internal VID DAC to generate precise VFB reference for regulation.
TG / BG (Pins 21, 17)	Top and bottom gate drivers	Drive dual N-channel MOSFETs with 2A peak, 50mA RMS capability - supports logic-level FETs with 5V INTVCC supply.
PGOOD (Pin 4)	Power-good open-drain output	Asserts low when VFB deviates >±7.5% - provides system-level power sequencing and fault indication to host controller.
VRNG (Pin 5)	Sense voltage range select	Sets nominal current sense threshold (50–200mV) - determines current limit accuracy when using MOSFET R_DS(ON) or sense resistor.

Key Features

Feature	Design Value
Valley current mode control	Enables stable operation at ultra-low duty cycles without external sense resistor - eliminates R_SENSE losses and PCB area while maintaining cycle-by-cycle current limiting.
Active voltage positioning (AVP)	Supports load-line regulation by dynamically adjusting output voltage downward under increasing load - improves transient response and reduces output capacitor requirements.
Discontinuous/continuous mode selection	FCB pin enables user-selectable light-load operation - discontinuous mode maximizes efficiency at low load; forced continuous reduces EMI and supports secondary winding regulation.
Ceramic output capacitor support	Stable with low-ESR ceramic C_OUT - eliminates need for bulk electrolytic capacitors, reducing size, improving reliability, and enabling fast transient response.
Programmable soft-start	External capacitor on RUN/SS pin controls startup dI/dt - prevents inrush current, limits stress on input capacitors and MOSFETs during power-up.

Applications

Mobile CPU Core Power Supply	Notebook System Rail Generation
Use Scenario: Regulating core voltage for Intel Mobile Pentium processors in ultraportable notebooks with 15A peak load. IC Role / Device Role / Timing Role: Primary synchronous buck controller implementing VID-based dynamic voltage scaling and AVP for optimal power efficiency. Use Value: Delivers <100ns minimum on-time and valley current sensing to maintain regulation at 24V input → 1.5V/15A output without external sense resistor - reducing thermal stress and component count.	Use Scenario: Generating 1.8V I/O rail for chipset and memory interface in clamshell-form-factor laptops. IC Role / Device Role / Timing Role: Secondary synchronous buck controller with programmable frequency and forced continuous mode for low-noise operation near RF sections. Use Value: Stable ceramic-capacitor-based design with ±1% reference and PGOOD monitoring ensures reliable power sequencing and meets stringent notebook ripple (<20mV_pp) requirements.
Palmtop/PDA Main DC-DC Converter	Industrial Embedded Processor Supply
Use Scenario: High-efficiency 5V-to-1.2V conversion in battery-powered PDAs with 3A maximum load and thermal constraints. IC Role / Device Role / Timing Role: Step-down controller with micropower shutdown (I_Q < 30µA) and wide 4V–36V input range supporting Li-ion + wall adapter operation. Use Value: Discontinuous mode operation at light loads extends battery life; no-RSENSE architecture minimizes conduction loss in space-constrained PCB layouts.	Use Scenario: Providing 1.5V core supply for ARM-based industrial controllers operating in –40°C to +85°C ambient with 12V nominal input. IC Role / Device Role / Timing Role: Robust synchronous buck controller with guaranteed –40°C to +85°C performance, EXTVCC switchover, and overvoltage/undervoltage protection. Use Value: Internal 5V LDO and EXTVCC switchover (4.7V threshold) enable efficient gate drive from secondary windings - eliminating need for discrete bias supply and improving system efficiency.

Mobile CPU Core Power Supply

Notebook System Rail Generation

Use Scenario: Regulating core voltage for Intel Mobile Pentium processors in ultraportable notebooks with 15A peak load.

IC Role / Device Role / Timing Role: Primary synchronous buck controller implementing VID-based dynamic voltage scaling and AVP for optimal power efficiency.

Use Value: Delivers <100ns minimum on-time and valley current sensing to maintain regulation at 24V input → 1.5V/15A output without external sense resistor - reducing thermal stress and component count.

Use Scenario: Generating 1.8V I/O rail for chipset and memory interface in clamshell-form-factor laptops.

IC Role / Device Role / Timing Role: Secondary synchronous buck controller with programmable frequency and forced continuous mode for low-noise operation near RF sections.

Use Value: Stable ceramic-capacitor-based design with ±1% reference and PGOOD monitoring ensures reliable power sequencing and meets stringent notebook ripple (<20mV_pp) requirements.

Palmtop/PDA Main DC-DC Converter

Industrial Embedded Processor Supply

Use Scenario: High-efficiency 5V-to-1.2V conversion in battery-powered PDAs with 3A maximum load and thermal constraints.

IC Role / Device Role / Timing Role: Step-down controller with micropower shutdown (I_Q < 30µA) and wide 4V–36V input range supporting Li-ion + wall adapter operation.

Use Value: Discontinuous mode operation at light loads extends battery life; no-RSENSE architecture minimizes conduction loss in space-constrained PCB layouts.

Use Scenario: Providing 1.5V core supply for ARM-based industrial controllers operating in –40°C to +85°C ambient with 12V nominal input.

IC Role / Device Role / Timing Role: Robust synchronous buck controller with guaranteed –40°C to +85°C performance, EXTVCC switchover, and overvoltage/undervoltage protection.

Use Value: Internal 5V LDO and EXTVCC switchover (4.7V threshold) enable efficient gate drive from secondary windings - eliminating need for discrete bias supply and improving system efficiency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6260CRZ-T	Fixed 1.5V output; no VID interface; requires external R_SENSE; lower max input (28V)	Targeted at fixed-voltage GPU or peripheral rails - lacks dynamic VID scaling and AVP support	Select only if VID programmability and CPU-core-specific features are unnecessary and cost is primary driver.
TPS51220ARUKT	Integrated MOSFET drivers only (no power FETs); supports 3-phase VR12; higher I_Q (120µA)	Designed for multi-phase CPU VRMs with digital IMVP-6/7 compliance - not drop-in for single-phase VID applications	Choose for newer Intel platforms requiring multi-phase control; not suitable as direct replacement for LTC3711EGN#TRPBF's single-phase VID function.

Compared with ISL6260CRZ-T and TPS51220ARUKT, the LTC3711EGN#TRPBF uniquely combines Intel mobile VID compatibility, no-RSENSE valley current sensing, and active voltage positioning - making it the only option among the three qualified for legacy Pentium-class CPU core regulation with minimal external components.

Availability

LTC3711EGN#TRPBF is available at Aetrix Electronics and suitable for mobile computing power supplies, notebook system rail generation, and industrial embedded processor applications requiring stable component supply, long-lifecycle availability, and guaranteed parametric performance over –40°C to +85°C.

Supply support for LTC3711EGN#TRPBF 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

Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC3711 series.

The LTC3711 belongs to Linear's high-performance power management controller family, specifically engineered for CPU core voltage regulation in mobile computing platforms with emphasis on low-duty-cycle stability, VID compliance, and no-RSENSE efficiency.

FAQ

What is the purpose of the VRNG pin on the LTC3711EGN#TRPBF?

The VRNG pin on the LTC3711EGN#TRPBF sets the nominal current sense threshold voltage, ranging from 50mV to 200mV depending on the applied voltage (0.5V–2V). This directly scales the maximum allowable valley current sensed either across the bottom MOSFET's R_DS(ON) or an external sense resistor. For example, tying VRNG to INTVCC yields ~140mV nominal sense voltage, enabling accurate current limiting without calibration. The LTC3711EGN#TRPBF uses this setting to determine inductor current thresholds in its valley current mode control loop.

Does the LTC3711EGN#TRPBF require an external sense resistor?

No, the LTC3711EGN#TRPBF does not require an external sense resistor. It implements no-RSENSE valley current mode control by measuring voltage across the bottom N-channel MOSFET's on-resistance (R_DS(ON)) between SENSE+ and PGND pins. This eliminates sense resistor losses and PCB area. An external resistor may be used optionally for tighter current limit tolerance, but the LTC3711EGN#TRPBF is fully functional and specified for operation using MOSFET R_DS(ON) alone.

How is the switching frequency set on the LTC3711EGN#TRPBF?

The switching frequency of the LTC3711EGN#TRPBF is set implicitly by the one-shot timer controlling top-MOSFET on-time, which depends on the current into the ION pin and voltage at the VON pin. A resistor R_ON from VIN to ION establishes frequency; typical values range from 10kΩ to 100kΩ for 200kHz–1MHz operation. Tying VON to VOUT stabilizes frequency across output voltage changes. The LTC3711EGN#TRPBF datasheet provides Figure 3 showing exact f vs R_ON curves for design validation.

What protection features does the LTC3711EGN#TRPBF include?

The LTC3711EGN#TRPBF integrates multiple protection features: output overvoltage protection (OVP) that shuts off M1 and latches M2 on; undervoltage lockout (UVLO) with 3.4V–4.0V hysteresis; foldback current limiting during short-circuit; PGOOD monitoring with ±7.5% window; and optional short-circuit shutdown timer. These ensure robust operation during fault conditions without external circuitry. All protections are active and tested across the full –40°C to +85°C temperature range for the LTC3711EGN#TRPBF.

Can the LTC3711EGN#TRPBF operate with ceramic output capacitors?

Yes, the LTC3711EGN#TRPBF is explicitly designed and characterized for stable operation with low-ESR ceramic output capacitors. Its control loop compensates for the zero introduced by ceramic C_OUT, eliminating the need for bulk electrolytic capacitors. This reduces board area, improves reliability, and enables faster transient response - critical for CPU core supplies. The LTC3711EGN#TRPBF datasheet confirms stability with 270µF ceramic arrays (e.g., four 68µF X5R units) as shown in Figure 1.

LTC3711EGN#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4V ~ 36V

Frequency - Switching:: -

Duty Cycle (Max):: 90%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Power Good, Soft Start

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SSOP

LTC3711EGN#TRPBF FAQ

1.How can I place an order for LTC3711EGN#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3711EGN#TRPBF 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 LTC3711EGN#TRPBF reliable?

The price and inventory of LTC3711EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3711EGN#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3711EGN#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3711EGN#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3711EGN#TRPBF?

LTC3711EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3711EGN#TRPBF 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 LTC3711EGN#TRPBF?

For technical support, including LTC3711EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3711EGN#TRPBF requirements.

6.How does Aetrix verify that LTC3711EGN#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3711EGN#TRPBF 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 LTC3711EGN#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3711EGN#TRPBF?

All LTC3711EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3711EGN#TRPBF, 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 LTC3711EGN#TRPBF part is unused and in its original packaging.

Return procedure for LTC3711EGN#TRPBF:

1.Submit a request within 90 days.

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

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