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Analog Devices Inc. LTC3816IFE#PBF
- Part No.:
- LTC3816IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3816IFE#PBF.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,022
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Product details
Overview
LTC3816IFE#PBF from Analog Devices (formerly Linear Technology) is a single-phase synchronous step-down DC/DC controller optimized for Intel IMVP-6/IMVP-6.5 CPU core power delivery. It supports 4.5V–36V input, delivers programmable output voltages via 7-bit VID code (e.g., 0.75V VCC(CORE)), features tON(MIN) < 35ns for ultra-low duty cycles, and integrates differential remote sensing with active voltage positioning - used in mobile computing and embedded navigation displays.
For engineers reviewing the LTC3816IFE#PBF datasheet, LTC3816IFE#PBF pinout, LTC3816IFE#PBF application, or LTC3816IFE#PBF equivalent, key selection criteria include IMVP-6/6.5 compliance, phase-lockable 150–550kHz switching frequency, thermal throttling flag (VRTT#), programmable slow-slew sleep exit, and dual-package availability (38-pin eTSSOP and QFN).
Technical Context
The LTC3816IFE#PBF employs constant-frequency voltage-mode control with leading-edge modulation to enable precise low-voltage regulation down to 0.3V. Its error amplifier (80dB DC gain, 20MHz unity-gain bandwidth) drives the COMP pin, which interfaces directly with line feedforward and loop compensation networks.
Fault management includes cycle-by-cycle current limiting via ISENP/ISENN inputs, overvoltage protection (1.65V/1.53V thresholds per IMVP mode), and thermal shutdown triggered by RPTC voltage exceeding 0.47V. The controller supports both pulse-skipping and forced continuous modes via MODE/SYNC pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 36V - enables direct integration with wide-input industrial or automotive power rails without pre-regulation. |
| Switching Frequency | 150kHz to 550kHz, phase-lockable - allows EMI optimization and synchronization with system clocks. |
| tON(MIN) | < 35ns - supports stable operation at very low duty cycles required for sub-1V CPU core outputs. |
| VCC(CORE) Accuracy | ±0.75% (0.5V–0.75V range) - ensures tight regulation critical for modern low-voltage processor cores. |
| VID Interface | 7-bit parallel (VID0–VID6) - implements Intel IMVP-6/6.5 dynamic voltage scaling with boot-up preset (1.2V or 1.1V). |
| Current Sensing | Temperature-compensated DCR or discrete resistor - maintains accurate load-current reporting across temperature for IMON output and AVP. |
| Thermal Protection | RPTC input with 0.47V threshold - triggers VRTT# flag for external thermal throttling of CPU or VRM components. |
Pinout & Package
The LTC3816IFE#PBF is housed in a 38-lead thermally enhanced plastic eTSSOP package (FE grade), with exposed pad soldered to PCB for thermal dissipation (θJA = 29°C/W). Pin 39 is GND and must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISENN (Pin 1) | Current sense negative input | Connects to low-side of sense resistor or inductor DCR network; enables accurate current monitoring. |
| IMON (Pin 5) | IMVP configuration select & current monitor output | Pulled to INTVCC for IMVP-6 (1.2V boot); tied to VSS(SEN) for IMVP-6.5 (1.1V boot, proportional IMON current). |
| VRON (Pin 7) | Regulator enable with hysteresis | 1.2V rising threshold initiates startup; falling below 0.65V triggers controlled shutdown and PWRGD latch. |
| DPRSLPVR (Pin 14) | Deeper sleep mode control | Assert high to enable slow-slew VOUT transition during deep sleep states (IMVP-6 only). |
| MODE/SYNC (Pin 24) | Mode selection / clock sync input | Float or tie to INTVCC for pulse-skipping; ground for forced continuous; accept external clock for synchronization. |
| TG / BG (Pins 31 / 26) | Top/bottom gate drivers | Drive N-channel MOSFETs with 2.6Ω/1.2Ω pull-up/pull-down on-resistance; support bootstrap (TG) and synchronous rectification (BG). |
Key Features
| Feature | Design Value |
|---|---|
| IMVP-6/6.5 Compliance | Fully implements all mandatory requirements including preset boot voltage, differential remote sensing, AVP, IMON reporting, and sleep-state power optimization. |
| Programmable Sleep Exit Slew Rate | CSLEW pin accepts capacitor to set VID DAC slew rate (1.25mV/µs slow or 5mV/µs fast), reducing transient stress during wake-up. |
| Integrated Thermal Throttling Flag | VRTT# open-drain output asserts low when RPTC > 0.47V, enabling direct CPU thermal throttling without external circuitry. |
| Robust Fault Protection | Includes input UVLO (3.9V), cycle-by-cycle current limit, output OVP (1.65V/1.53V), and overtemperature latching with PWRGD coordination. |
| Flexible Power Input Architecture | Internal LDO (INTVCC) + EXTVCC switchover (4.5V threshold) reduces power loss and heat generation at high input voltages. |
Applications
| Mobile Computing Power Delivery | Embedded Navigation Display Supply |
|---|---|
Use Scenario: Powering Intel Core i-series CPUs in ultrabooks and 2-in-1 tablets requiring dynamic voltage scaling and deep sleep efficiency. IC Role / Device Role / Timing Role: Primary IMVP-6.5-compliant core voltage regulator controlling VCC(CORE) via 7-bit VID interface and differential remote sensing. Use Value: Enables <1.1V output with ±0.75% accuracy and programmable slow-slew exit from C6/C7 states, extending battery life without compromising wake latency. | Use Scenario: Providing stable, low-noise core power to ARM-based navigation SoCs in automotive infotainment head units. IC Role / Device Role / Timing Role: Synchronous buck controller delivering 0.75V @ up to 30A with active voltage positioning and thermal throttling feedback (VRTT#). Use Value: Maintains tight regulation under wide VIN (9–36V automotive) and load transients while coordinating thermal derating with host processor via VRTT#. |
| Industrial Embedded Computing | Internet-of-Things Edge Gateway Power |
Use Scenario: Regulating CPU core voltage in fanless industrial PCs deployed in harsh environments (-40°C to 125°C). IC Role / Device Role / Timing Role: High-reliability IMVP-6 controller with extended temperature grade (I-grade), RPTC-based MOSFET temperature monitoring, and robust fault latching. Use Value: Guarantees full-spec operation across junction temperature range with thermal flag coordination, eliminating need for external thermal sensors. | Use Scenario: Powering multi-core application processors in compact, thermally constrained IoT gateways with limited airflow. IC Role / Device Role / Timing Role: Efficient single-phase controller supporting forced continuous mode (via MODE/SYNC) and pulse-skipping for light-load efficiency. Use Value: Achieves >90% efficiency at 0.1A–30A loads using programmable AVP slope and DCR current sensing, minimizing heatsink size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPU core voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95831IRZ | Single-phase IMVP-7/7.5 controller; supports higher max frequency (1MHz); integrated MOSFET drivers rated for 60A peak. | Targets newer Intel 4th–7th gen CPUs; lacks RPTC input and VRTT# flag; requires external thermal management. | Select for IMVP-7 designs requiring faster transient response; not drop-in for IMVP-6/6.5 systems due to VID timing and feature set differences. |
| TPS51622RGER | TI dual-phase IMVP-6.5 controller; includes integrated MOSFET drivers and PMBus interface; no RPTC or VRTT#. | Designed for higher-current (>40A) notebook CPU rails; supports phase interleaving but adds complexity for single-phase use cases. | Choose when scaling beyond 30A or adding digital telemetry; incompatible pinout and feature mapping prevents direct replacement. |
Compared with ISL95831IRZ and TPS51622RGER, the LTC3816IFE#PBF offers unique thermal throttling coordination via VRTT# and proven IMVP-6/6.5 compliance in a single-phase, pin-compatible eTSSOP/QFN footprint - making it optimal for cost-sensitive, thermally aware mobile and embedded CPU power designs where digital interface or multi-phase capability is unnecessary.
Availability
LTC3816IFE#PBF is available at Aetrix Electronics and suitable for mobile computing, embedded navigation displays, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC3816IFE#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio. Linear Technology was renowned for precision DC/DC controllers and µModule solutions.
The LTC3816IFE#PBF belongs to Linear's IMVP-compliant controller family, engineered specifically for Intel CPU core power delivery with emphasis on accuracy, thermal intelligence, and seamless integration into mobile and embedded platforms.
FAQ
What is the operating temperature range for the LTC3816IFE#PBF?
The LTC3816IFE#PBF is specified for –40°C to 125°C junction temperature operation. This I-grade rating is fully guaranteed across the range, unlike the E-grade version, and is validated through design, characterization, and statistical process controls - making the LTC3816IFE#PBF suitable for demanding industrial and automotive-adjacent embedded applications where ambient temperatures exceed 85°C.
How does the LTC3816IFE#PBF implement active voltage positioning (AVP)?
The LTC3816IFE#PBF implements AVP via programmable slope (–3mV/A typical) applied to the differential VCC(SEN)/VSS(SEN) feedback path. Using external resistors and capacitors on the ITCFB and ITC pins, the controller adjusts output voltage downward under increasing load to counteract IR drops in the power delivery network - maintaining stable CPU core voltage at the die. This function is fully supported in both IMVP-6 and IMVP-6.5 configurations of the LTC3816IFE#PBF.
Can the LTC3816IFE#PBF be synchronized to an external clock source?
Yes, the LTC3816IFE#PBF supports external clock synchronization via the MODE/SYNC pin. When driven with a clean square wave between 150kHz and 550kHz, the internal PLL locks the switching frequency and aligns the falling edge of the top gate (TG) signal to the falling edge of the MODE/SYNC input - enabling EMI reduction and noise cancellation in multi-rail systems. This capability is confirmed in the LTC3816IFE#PBF datasheet's oscillator and drivers section.
What is the purpose of the RPTC pin on the LTC3816IFE#PBF?
The RPTC pin on the LTC3816IFE#PBF serves as a nonlinear PTC thermistor input for MOSFET or inductor temperature monitoring. Internally sourced with ~100µA, it pulls the RPTC node toward INTVCC; when voltage exceeds 0.47V (indicating elevated temperature), the open-drain VRTT# flag is pulled low. This provides direct thermal throttling coordination with the CPU - a feature explicitly documented for the LTC3816IFE#PBF and distinct from generic overtemperature shutdown.
Does the LTC3816IFE#PBF support both IMVP-6 and IMVP-6.5 protocols?
Yes, the LTC3816IFE#PBF supports both IMVP-6 and IMVP-6.5 protocols via the IMON pin configuration. Tying IMON to INTVCC selects IMVP-6 (1.2V boot, fixed IMON current, slow-slew enabled). Connecting IMON to VSS(SEN) selects IMVP-6.5 (1.1V boot, proportional IMON current, slow-slew disabled). Both modes are fully implemented in the LTC3816IFE#PBF, with separate OVP thresholds (1.65V vs. 1.53V) and verified in electrical characteristics tables.
LTC3816IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller, Intel IMVP-6, IMVP-6.5™
- Voltage - Input:
- 4.5V ~ 36V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.013V ~ 1.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3816IFE#PBF FAQ
1.How can I place an order for LTC3816IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3816IFE#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 LTC3816IFE#PBF reliable?
The price and inventory of LTC3816IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3816IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3816IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3816IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3816IFE#PBF?
LTC3816IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3816IFE#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 LTC3816IFE#PBF?
For technical support, including LTC3816IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3816IFE#PBF requirements.
6.How does Aetrix verify that LTC3816IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3816IFE#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 LTC3816IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3816IFE#PBF?
All LTC3816IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3816IFE#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 LTC3816IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3816IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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