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Analog Devices Inc. LTC3714EG#PBF
- Part No.:
- LTC3714EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3714EG#PBF.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
LTC3714EG#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller optimized for CPU power delivery in mobile computing systems. It supports Intel mobile VID programming (5-bit, 0.6V–1.75V), operates from 4V to 36V input, delivers up to 23A output, and uses constant-on-time valley current control without a sense resistor. It is used in notebook power supplies for Pentium® and Transmeta processors.
For engineers reviewing the LTC3714EG#PBF datasheet, LTC3714EG#PBF pinout, LTC3714EG#PBF application, or LTC3714EG#PBF equivalent, key selection considerations include its VID-programmable output voltage range, forced-continuous mode control via FCB pin, ±1% 0.6V reference accuracy, tON(MIN) < 100ns capability, and dual N-channel MOSFET gate drive architecture.
Technical Context
The LTC3714EG#PBF implements a constant-on-time, valley-current-mode control architecture with internal error amplifier and programmable current-sense threshold scaling via VRNG pin. Its on-time is set by ION current and VON voltage, enabling frequency stability across VIN and VOUT variations.
Fault protection includes foldback current limiting, output overvoltage comparator (±10% PGOOD window), optional short-circuit shutdown timer, and undervoltage lockout (3.4V–4.0V). The integrated op amp supports programmable output voltage offsets during power-saving modes and true differential remote sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-input industrial and mobile battery-fed systems without external pre-regulation. |
| Output Voltage Range | 0.6V to 1.75V (5-bit VID) - matches Intel mobile processor core voltage requirements with ±1% reference accuracy. |
| Min On-Time | 50ns (typ) - enables stable operation at high VIN/VOUT ratios (e.g., 24V→1.2V) without pulse-skipping instability. |
| Gate Drive Outputs | Dual N-channel drivers (TG/BG) with 2Ω pull-up/pull-down - drives logic-level MOSFETs directly with fast 20ns rise/fall times. |
| Current Sense Method | No external sense resistor required - uses bottom MOSFET RDS(ON) or optional discrete resistor; VRNG pin sets nominal sense voltage (50–200mV). |
| Soft-Start Control | Capacitor-programmable via RUN/SS pin - provides controlled output ramp and overcurrent latchoff delay (≈3s/µF). |
| Operating Temperature | –40°C to +85°C (EG grade) - qualified for extended-temperature portable and embedded applications. |
Pinout & Package
Package: 28-lead plastic SSOP (0.209" wide), RoHS-compliant, lead-free (Pb-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (1) | Bottom Gate Driver Output | Drives gate of synchronous bottom N-MOSFET between PGND and INTVCC; 2Ω pull-down ensures fast turn-off. |
| PGND (2) | Power Ground Reference | Low-impedance return path for sense signal, SW node, CVCC, and CIN; must be connected near MOSFET source or sense resistor. |
| SENSE (3) | Current Sense Input (+) | Connects to SW node (no sense resistor) or MOSFET source (with resistor); enables valley-current detection without external shunt. |
| SW (4) | Switch Node | High-swing node connecting to inductor, top MOSFET drain, and bootstrap capacitor (–) terminal; swings from –0.3V to VIN. |
| TG (5) | Top Gate Driver Output | Drives gate of high-side N-MOSFET with floating voltage swing (INTVCC superimposed on SW); requires external bootstrap diode/capacitor. |
| BOOST (6) | Bootstrap Supply Input (+) | Connects to (+) terminal of bootstrap capacitor; swings from INTVCC–0.3V to VIN+INTVCC; powers TG driver. |
| VID0–VID4 (7,8,9,24,25) | 5-Bit Voltage ID Inputs | Set DAC-controlled feedback divider ratio; unconnected pins pulled high internally (2.5µA), enabling 32 discrete output voltages. |
| RUN/SS (10) | Enable & Soft-Start Input | Pull below 0.8V for shutdown; external capacitor sets soft-start ramp time and overcurrent fault delay. |
| VON (11) | On-Time Voltage Input | Sets one-shot comparator trip point (0.7V–2.4V clamped); tying to VOUT stabilizes frequency across output voltage changes. |
| PGOOD (12) | Power-Good Open-Drain Output | Asserts low when VFB deviates >±10% from 0.6V; requires external pull-up for system sequencing or monitoring. |
| VRNG (13) | Sense Voltage Range Select | Sets nominal current-sense threshold (50–200mV) via resistive divider from INTVCC; determines full-scale current limit scaling. |
| ITH (14) | Error Amplifier Output / Current Threshold | 0–2.4V control voltage setting valley current limit; also serves as compensation node for EA loop stability. |
| OPVIN (15) | Op Amp Supply Input | Accepts INTVCC or separate ≥5V supply; powers internal op amp for offset programming or differential remote sensing. |
| OP– (16), OP+ (17) | Op Amp Differential Inputs | Support programmable negative voltage offsets (via external R-network) or true Kelvin sensing across output capacitor. |
| OPOUT (18) | Op Amp Output | Connected to VOSENSE to inject offset or enable unity-gain remote sense; drives external resistive networks for sleep/battery mode offsets. |
| SGND (19) | Signal Ground | Reference for all small-signal pins (VFB, VOSENSE, ITH, op amp); must tie to PGND at single point to avoid noise coupling. |
| FCB (20) | Forced Continuous Mode Control | Pull to GND for continuous conduction (low-noise, fast transient); tie to INTVCC for discontinuous mode (high light-load efficiency). |
| ION (21) | On-Time Current Input | Resistor from VIN sets one-shot current; determines tON and thus operating frequency (≈300kHz typical with RON = 100kΩ). |
| VFB (22) | Error Amplifier Feedback Input | Connects to internal 0.6V reference and VID DAC output; accepts external compensation network for loop stability. |
| VOSENSE (23) | Output Voltage Sense Input | Primary feedback node for VID DAC; connects directly to regulated output or remote sense point for precision regulation. |
| EXTVCC (26) | External VCC Input | When >4.7V, disables internal LDO and powers INTVCC directly - improves efficiency when secondary 5V rail is available. |
| VIN (27) | Main Input Supply | 4V–36V input; requires RC filter (1Ω + 0.1µF) to SGND for noise suppression and EMI reduction. |
| INTVCC (28) | Internal 5V Regulator Output | Supplies gate drivers and control circuitry; decoupled with ≥4.7µF low-ESR tantalum to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-on-time valley current control | Enables ultrafast transient response (<20µs recovery from 8A→23A load step) and stable ceramic-capacitor-based designs without phase compensation. |
| Programmable active voltage positioning (AVP) | Internal op amp + VID DAC allows precise negative output offsets during low-power states, reducing CPU power dissipation under light load. |
| Discontinuous/forced-continuous mode selection | FCB pin toggles between high-efficiency DCM (light load) and low-ripple CCM (noise-sensitive systems), eliminating need for external mode-control logic. |
| Integrated 0.6V ±1% reference with line/load regulation | Ensures output accuracy across 4V–30V input and full load range; ∆VFB(LINEREG) = 0.002%/V and ∆VFB(LOADREG) = ±0.3% support tight regulation specs. |
| Logic-controlled micropower shutdown | IQ ≤ 30µA in shutdown - preserves battery life in portable systems; RUN/SS pin provides clean enable/disable with hysteresis (0.8V ON / 4.2V OFF). |
| Wide-range programmable frequency | External RON sets nominal frequency; VON-to-VOUT connection maintains constant f across VOUT changes - simplifies multi-rail design with shared components. |
Applications
| Mobile CPU Power Supply | Notebook System Power |
|---|---|
Use Scenario: Core voltage regulation for Intel Pentium® M and Transmeta Efficeon™ processors in ultraportable laptops. IC Role / Device Role / Timing Role: Primary step-down controller managing VID-programmed output, dynamic voltage scaling, and power-good sequencing. Use Value: Enables <100ns minimum on-time for 24V input → 1.25V output conversion while maintaining >90% efficiency at 10A load. |
Use Scenario: Main 1.35V/15A system rail in 12V-input notebook platforms with multiple power domains. IC Role / Device Role / Timing Role: Synchronous buck controller coordinating with EC firmware for adaptive voltage positioning and thermal throttling. Use Value: Discontinuous mode extends battery runtime at idle; forced-continuous mode reduces EMI during video playback or Wi-Fi transmission. |
| Industrial Embedded Computing | High-Density DC/DC Module |
Use Scenario: 5V-to-1.5V conversion for ARM-based industrial controllers operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust, temperature-stable buck controller with integrated op amp for remote sensing across long PCB traces. Use Value: ±1% reference and <0.3% load regulation ensure consistent CPU performance across wide temperature and load ranges. |
Use Scenario: High-current (20A+) power module for telecom baseband boards requiring compact, efficient core rails. IC Role / Device Role / Timing Role: Controller IC driving paralleled MOSFETs with no sense resistor, minimizing board area and conduction losses. Use Value: Dual 2Ω gate drivers reduce MOSFET switching losses; EXTVCC support enables use of auxiliary 5V rail for >92% peak 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 |
|---|---|---|---|
| ISL6260CRTZ-T | Intel IMVP-6 compliant; supports 3-bit VID only (0.7V–1.5V); no internal op amp; requires external sense resistor. | Targeted at legacy Intel platforms with narrower VID range and fixed AVP profiles; lacks programmable offset capability. | Select ISL6260CRTZ-T only if IMVP-6 compliance and lower BOM cost outweigh need for wide VID range and flexible offset programming. |
| TPS51220ARUKT | Supports 5-bit VID (0.5V–1.5V); integrated MOSFET drivers but no internal op amp; uses external current-sense resistor. | Optimized for DDR memory termination and GPU rails; lacks VRNG-based sense-threshold scaling and forced-continuous control pin. | Choose TPS51220ARUKT for cost-sensitive dual-rail systems where internal op amp functionality is not required and sense-resistor loss is acceptable. |
Compared with ISL6260CRTZ-T and TPS51220ARUKT, the LTC3714EG#PBF uniquely combines 5-bit VID (0.6V–1.75V), no-sense-resistor operation, integrated op amp for programmable offsets, and FCB pin for seamless DCM/CCM transition - making it optimal for next-generation mobile CPU power with adaptive voltage positioning.
Availability
LTC3714EG#PBF is available at Aetrix Electronics and suitable for notebook power supplies, industrial embedded computing, high-density DC/DC modules, and mobile processor core voltage regulation requiring stable component supply and long-term lifecycle support.
Supply support for LTC3714EG#PBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3714EG#PBF belongs to Linear's high-efficiency DC/DC controller product line, designed specifically for demanding CPU and SoC power delivery in mobile and embedded systems with stringent transient, efficiency, and thermal requirements.
FAQ
What is the minimum on-time specification for the LTC3714EG#PBF, and why does it matter?
The LTC3714EG#PBF has a minimum on-time of 50ns (typical), critical for high-input-voltage, low-output-voltage applications such as 24V-to-1.25V conversion. This ensures stable operation at duty cycles below 5% without pulse-skipping or subharmonic oscillation - a key requirement for mobile CPU core rails where input voltage varies widely and output must remain tightly regulated.
How does the LTC3714EG#PBF achieve current sensing without an external resistor?
The LTC3714EG#PBF senses inductor valley current using the RDS(ON) of the bottom N-channel MOSFET as the current-sense element. The SENSE pin connects directly to the switch node (SW), allowing the controller to monitor voltage drop across the MOSFET's channel. This eliminates shunt resistor losses and BOM cost while maintaining accurate current limiting - provided the MOSFET's on-resistance is carefully selected and derated for temperature.
Can the LTC3714EG#PBF support active voltage positioning (AVP) for power savings?
Yes, the LTC3714EG#PBF supports programmable active voltage positioning via its integrated op amp. By configuring OP+, OP–, OPOUT, and OPVIN with external resistors, users can inject precise negative offsets (e.g., –50mV) into the VOSENSE path during low-power states. This reduces CPU dynamic power quadratically while maintaining functional stability - a feature confirmed in the device's Applications Information section and Figure 2a/2b.
What is the function of the FCB pin on the LTC3714EG#PBF, and how does it affect efficiency?
The FCB (Forced Continuous) pin on the LTC3714EG#PBF selects between discontinuous conduction mode (DCM) and forced continuous conduction mode (CCM). Pulling FCB to INTVCC enables DCM for highest light-load efficiency; pulling it to GND forces CCM for lower output ripple, faster transient response, and reduced EMI. This dual-mode capability lets designers optimize for either battery life or signal integrity without changing hardware.
Does the LTC3714EG#PBF require external compensation, and where is the compensation node located?
Yes, the LTC3714EG#PBF requires external Type-II or Type-III compensation for loop stability, connected at the ITH pin - which serves as both the error amplifier output and current threshold control node. The datasheet provides standard compensation equations and example networks based on output capacitance, ESR, and desired crossover frequency. Proper compensation ensures stable regulation across line, load, and temperature variations.
LTC3714EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller, Intel Pentium®
- Voltage - Input:
- 4V ~ 36V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.6V ~ 1.75V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3714EG#PBF FAQ
1.How can I place an order for LTC3714EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3714EG#PBF 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 LTC3714EG#PBF reliable?
The price and inventory of LTC3714EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3714EG#PBF is usually 5 days.
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LTC3714EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3714EG#PBF 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 LTC3714EG#PBF?
For technical support, including LTC3714EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3714EG#PBF requirements.
6.How does Aetrix verify that LTC3714EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3714EG#PBF 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 LTC3714EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3714EG#PBF?
All LTC3714EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3714EG#PBF, 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 LTC3714EG#PBF part is unused and in its original packaging.
Return procedure for LTC3714EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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