LTC1699EGN-81#PBF

Power Management - Specialized Overview

The LTC1699EGN-81#PBF is a precision, digitally programmed resistor divider compliant with Intel Desktop VRM8.4 VID specifications. It operates within a supply voltage range of 2.7V to 5.5V and features a programmable resistor divider with ±0.35% accuracy for use with 0.8V referenced DC/DC converters. The device utilizes a 2-wire SMBus interface (Rev 1.1) to store two distinct divider settings and control converter states. It includes safeguards against bus conflicts and provides three open-drain outputs (CPU_ON, IO_ON, CLK_ON) alongside a global control pin (VRON). The component is housed in a 16-lead SSOP package.

Power Management - Specialized Feature Summary

• Complies with Intel Desktop VRM8.4 VID specifications for precise voltage regulation
• Stores two independent divider settings via 2-wire SMBus serial interface
• Incorporates built-in safeguards to minimize misprogramming due to bus conflicts
• Provides simultaneous shutdown or soft-start control for multiple DC/DC converters

Power Management - Specialized Applications

• Intel Desktop Pentium III power supplies
• Desktop VRM8.4 compliant systems
• Multi-rail processor power management designs

Power Management - Specialized Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free RoHS compliance and tube packaging, distinct from the '#TRPBF' tape-and-reel variant. Confirm the '81' designation aligns with VRM8.4 requirements rather than mobile or VRM9.0 standards. Ensure the SSOP-16 package matches the target PCB footprint. Cross-reference the manufacturer's current lifecycle status as availability may be limited.

Power Management - Specialized Selection Notes

Select this component when designing for Intel Desktop VRM8.4 architectures requiring precise VID programming. The ±0.35% accuracy supports tight voltage tolerances for 0.8V referenced converters. The dual-setting capability allows dynamic voltage scaling between two predefined levels. The integrated open-drain outputs simplify control logic by directly managing converter enable pins without additional drivers.

Power Management - Specialized Part Context

This part belongs to the LTC1699 series of SMBus VID voltage programmers. The '81' suffix specifically targets desktop VRM8.4 specifications, differentiating it from the '80' (mobile) and '82' (VRM9.0) variants. All models share identical functional blocks but differ in VID code mapping to meet specific processor voltage requirements.

Power Management - Specialized Replacement Considerations

LTC1699EGN-80#PBF: Compatible for mobile VRM applications; verify VID table compatibility. LTC1699EGN-82#PBF: Compatible for VRM9.0 applications; verify VID table compatibility.