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Analog Devices Inc. LTC1706EMS-82#PBF
- Part No.:
- LTC1706EMS-82#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1706EMS-82#PBF.pdf
- Description:
- IC VID VOLTAGE PROGRAMMER 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,565
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Product details
Overview
LTC1706EMS-82#PBF from Analog Devices (formerly Linear Technology) is a precision 5-bit VID voltage programmer IC designed to set the output voltage of 0.8V-referenced DC/DC converters in compliance with Intel VRM9.0/9.1 specifications. It delivers programmable output voltages from 1.10V to 1.85V in precise 25mV steps, features ±0.25% output voltage accuracy, built-in 40kΩ pull-up resistors on all VID inputs, and operates from a 2.7V–5.5V supply. It is used in high-current multiphase CPU power supplies for Intel Pentium III and AMD Athlon processors.
For engineers reviewing the LTC1706EMS-82#PBF datasheet, LTC1706EMS-82#PBF pinout, LTC1706EMS-82#PBF application, or LTC1706EMS-82#PBF equivalent, key selection considerations include VRM9.0/9.1 compliance, 10-pin MSOP package compatibility, 5-bit digital VID interface timing, ±0.25% resistor ladder accuracy, and interoperability with LTC1629/LTC1702/LTC1929 family regulators.
Technical Context
The LTC1706EMS-82#PBF implements a digitally controlled resistive ladder where RFB1 (10kΩ fixed) connects SENSE to FB, while RFB2 is dynamically adjusted via five VID input states to generate precise feedback voltage offsets. Each VID bit contributes a defined voltage increment: VID0 = 25mV, VID1 = 50mV, VID2 = 100mV, VID3 = 200mV, VID4 = 400mV - enabling full 1.10V–1.85V range coverage in 25mV steps.
Its VID inputs integrate 40kΩ pull-up resistors with series diodes to VCC, allowing safe operation with input voltages exceeding VCC (up to 7V absolute max) without clamping or damage. The device draws only 0.1–5.0µA quiescent current when all VID pins float, rising predictably per grounded VID pin due to (VCC − 0.6V)/40kΩ current path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.10V to 1.85V in 25mV increments - enables exact VRM9.0/9.1 code mapping for CPU core voltage scaling. |
| Voltage Accuracy | ±0.25% over temperature - ensures stable regulation under thermal stress without external trimming. |
| VID Input Pull-Up | 40kΩ with series diode to VCC - permits logic-high via float or VCC, supports >VCC input tolerance, prevents damage. |
| Supply Voltage Range | 2.7V to 5.5V - compatible with standard 3.3V or 5V system rails without level-shifting. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and server-grade motherboard environments. |
| Package | 10-lead MSOP - surface-mount footprint optimized for dense VRM layouts near CPU socket. |
| SENSE–FB Resistance | 6kΩ to 14kΩ (typ. 10kΩ) - defines base feedback divider ratio; tightly controlled for accuracy. |
Pinout & Package
Package: 10-lead plastic MSOP (3.0mm × 3.0mm × 1.1mm height), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VID0) | LSB Digital Programming Input | Grounding adds +25mV to sense voltage offset; float or VCC = logic high. |
| 2 (VID1) | 4th MSB Digital Programming Input | Grounding adds +50mV; enables binary-weighted voltage step control. |
| 3 (VID2) | 3rd MSB Digital Programming Input | Grounding adds +100mV; part of deterministic 5-bit VID code mapping. |
| 4 (VID3) | 2nd MSB Digital Programming Input | Grounding adds +200mV; supports full 32-state output resolution. |
| 5 (VCC) | Power Supply Input | 2.7V–5.5V bias rail; powers internal logic and pull-ups; feeds series diodes on VID pins. |
| 6 (SENSE) | Regulator Output Sense Node | Connects directly to converter output or VDIFFOUT (e.g., LTC1629); carries full load current. |
| 7 (VID4) | MSB Digital Programming Input | Grounding adds +400mV; highest weight bit for coarse voltage adjustment. |
| 8 (NC) | No Connect | Unbonded pad; must remain unconnected per design; no routing or stitching. |
| 9 (GND) | Analog Ground Reference | Low-impedance return for FB, SENSE, and VID logic; requires dedicated ground plane tie. |
| 10 (FB) | 0.8V Feedback Input | High-impedance node connected to EAIN or 0.8V reference pin; minimal trace length required. |
Key Features
| Feature | Design Value |
|---|---|
| Fully VRM9.0/9.1 Compliant VID Interface | Directly maps Intel-specified 5-bit codes to 1.10V–1.85V outputs without external logic or translation. |
| ±0.25% Precision Resistive Ladder | Guaranteed voltage accuracy across –40°C to +85°C eliminates need for calibration or trimming. |
| Integrated 40kΩ VID Pull-Ups with Diodes | Enables robust interfacing to CPU VID signals at varying logic levels while preventing overvoltage damage. |
| 10kΩ Fixed RFB1 + Programmable RFB2 Architecture | Decouples top-divider stability from VID switching noise; maintains loop integrity during dynamic voltage transitions. |
| No-CPU Default Output (1.075V) | When all VID inputs float, asserts safe low-power state - prevents undefined regulator behavior during boot or hot-plug. |
Applications
| Intel Pentium III Power Supply | AMD Athlon Processor Power Supply |
|---|---|
Use Scenario: Desktop and workstation motherboards requiring strict VRM9.0/9.1 compliance for Pentium III CPUs with dynamic VID-based voltage scaling. IC Role / Device Role / Timing Role: VID voltage programmer that translates CPU's 5-bit VID command into precise feedback voltage for synchronous buck controller (e.g., LTC1629). Use Value: Enables accurate 25mV-step core voltage adjustment across full 1.10V–1.85V range, meeting Intel's ±1% total output tolerance requirement. | Use Scenario: High-performance desktop platforms using AMD Athlon processors with VRM9.x-compatible power delivery. IC Role / Device Role / Timing Role: Precision resistor ladder that sets regulator output by modifying feedback network based on CPU VID state. Use Value: Delivers ±0.25% voltage accuracy independent of temperature, ensuring stable CPU operation under thermal cycling and load transients. |
| Multiphase Processor Power Supply | Server-Class VRM Module |
Use Scenario: Scalable 4-phase or 6-phase CPU power stages delivering up to 200A using paralleled LTC1629 controllers. IC Role / Device Role / Timing Role: Centralized VID interface that simultaneously programs multiple synchronous buck controllers via shared SENSE/FB connections. Use Value: Maintains identical output voltage across all phases with matched resistor ladder accuracy, minimizing inter-phase current imbalance. | Use Scenario: Rack-mounted servers requiring long-term reliability, thermal robustness, and lifecycle continuity for VRM components. IC Role / Device Role / Timing Role: Industrial-grade VID programmer with –40°C to +85°C operation and MSOP packaging suitable for automated assembly and reflow. Use Value: Supports BOM stability and supply chain resilience with documented obsolescence management and traceable sourcing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar VID voltage programming applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1706-81 | Supports VRM8.2–8.4 desktop code set; 1.3V–3.5V output range; same MSOP-10 package and pinout. | Targeted at older Pentium II/early Celeron systems; incompatible with VRM9.0/9.1 voltage tables and CPU VID timing. | Select only for legacy VRM8.x designs; not interchangeable with LTC1706EMS-82#PBF without firmware and layout changes. |
| LTC1736 | Integrated 5-bit mobile VID controller with fault protection, power-good output, and GN-24 package; not a standalone resistor ladder. | Designed for notebook/mobile VRM with battery-aware features; lacks direct SENSE/FB interface; requires different system integration. | Use for new mobile designs requiring integrated protection; not a drop-in replacement - replaces entire controller, not just VID interface. |
Compared with LTC1706-81 and LTC1736, the LTC1706EMS-82#PBF uniquely combines VRM9.0/9.1 compliance, ±0.25% resistor accuracy, and passive ladder simplicity - making it the only choice for high-precision, low-noise, multi-controller VID distribution in server and workstation VRMs.
Availability
LTC1706EMS-82#PBF is available at Aetrix Electronics and suitable for Intel Pentium III power supplies, AMD Athlon processor power supplies, and multiphase server VRM modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1706EMS-82#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision instrumentation, industrial, automotive, and computing applications.
The LTC1706EMS-82#PBF belongs to Linear Technology's VRM-compliant power management product line, engineered specifically to simplify and harden CPU core voltage programming in high-current, multi-phase server and workstation power supplies.
FAQ
What is the primary function of the LTC1706EMS-82#PBF in a CPU power supply?
The LTC1706EMS-82#PBF serves as a precision 5-bit VID voltage programmer that converts digital CPU voltage identification codes into an accurate analog feedback voltage (1.10V–1.85V in 25mV steps) for 0.8V-referenced DC/DC controllers. It replaces manual resistor networks with guaranteed ±0.25% accuracy and full VRM9.0/9.1 compliance - critical for stable operation of Intel Pentium III and AMD Athlon processors. The LTC1706EMS-82#PBF achieves this using a fixed 10kΩ top resistor (RFB1) and a digitally switched bottom resistor (RFB2) network tied to VID inputs.
Does the LTC1706EMS-82#PBF require external components to operate?
No, the LTC1706EMS-82#PBF operates autonomously with only its VCC supply (2.7V–5.5V), GND, SENSE, FB, and five VID inputs connected. It integrates all necessary 40kΩ pull-up resistors and series diodes on VID pins, eliminating external biasing components. No external capacitors, resistors, or level shifters are needed - the LTC1706EMS-82#PBF is a complete, self-contained VID interface solution for VRM9.0/9.1-compliant systems.
Can the LTC1706EMS-82#PBF be used with non-Linear Technology regulators?
Yes - the LTC1706EMS-82#PBF is compatible with any DC/DC converter featuring a 0.8V internal reference and a high-impedance feedback (FB) input, provided the SENSE node is accessible and the regulator supports remote sensing. While optimized for LTC1629, LTC1702, LTC1929, and LTC3729, it has been validated with third-party 0.8V-reference buck controllers in VRM9.0/9.1 implementations. Always verify FB pin voltage range (0–0.8V typical) and SENSE node drive capability before integration with the LTC1706EMS-82#PBF.
What happens if all VID inputs are left floating on the LTC1706EMS-82#PBF?
When all five VID inputs (VID0–VID4) are floating or tied to VCC, the LTC1706EMS-82#PBF asserts a "no-CPU" default output voltage of 1.075V at the SENSE pin. This safe-state voltage prevents undefined regulator behavior during system initialization, CPU hot-plug, or VID signal loss. The 1.075V level is internally generated and does not require external configuration - a key reliability feature built into the LTC1706EMS-82#PBF architecture.
Is the LTC1706EMS-82#PBF pin-compatible with other members of the LTC1706 family?
Yes - the LTC1706EMS-82#PBF shares identical pinout, package (MSOP-10), and electrical interface with LTC1706-81, LTC1706-83, and other -8x variants. However, VID code mapping differs: LTC1706EMS-82#PBF implements VRM9.0/9.1 (1.10V–1.85V), while LTC1706-81 uses VRM8.2–8.4 (1.3V–3.5V). Swapping variants requires matching firmware VID tables and verifying regulator compatibility - the LTC1706EMS-82#PBF is not functionally interchangeable without system-level validation.
LTC1706EMS-82#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- VID Voltage Programmer
- Voltage - Input:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 100 nA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1706EMS-82#PBF FAQ
1.How can I place an order for LTC1706EMS-82#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1706EMS-82#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 LTC1706EMS-82#PBF reliable?
The price and inventory of LTC1706EMS-82#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1706EMS-82#PBF is usually 5 days.
3.What payment methods are accepted for LTC1706EMS-82#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1706EMS-82#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1706EMS-82#PBF?
LTC1706EMS-82#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1706EMS-82#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 LTC1706EMS-82#PBF?
For technical support, including LTC1706EMS-82#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1706EMS-82#PBF requirements.
6.How does Aetrix verify that LTC1706EMS-82#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1706EMS-82#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 LTC1706EMS-82#PBF meets industry standards.
7.What is the process for return or replacement of LTC1706EMS-82#PBF?
All LTC1706EMS-82#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1706EMS-82#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 LTC1706EMS-82#PBF part is unused and in its original packaging.
Return procedure for LTC1706EMS-82#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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