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MAX1987

Maxim Integrated Products
Part Number MAX1987
Manufacturer Maxim Integrated Products
Description (MAX1987 / MAX1988) Quick-PWM Controllers
Published Apr 23, 2012
Detailed Description 19-2559; Rev 0; 7/02 PRELIMINARY Dual-Phase, Quick-PWM Controllers for IMVP-IV CPU Core Power Supplies CONFIDENTIAL IN...
Datasheet PDF File MAX1987 PDF File

MAX1987
MAX1987

Overview
19-2559; Rev 0; 7/02 PRELIMINARY Dual-Phase, Quick-PWM Controllers for IMVP-IV CPU Core Power Supplies CONFIDENTIAL INFORMATION—RESTRICTED TO INTEL IMVP LICENSEES General Description The MAX1987/MAX1988 are dual-phase, Quick-PWM™, step-down controllers for IMVP-IV™ CPU core supplies.
Dual-phase operation reduces input ripple current requirements and output voltage ripple, while easing component selection and layout difficulties.
The QuickPWM control scheme provides instantaneous response to fast load-current steps.
The MAX1987/MAX1988 include active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements.
The MAX1987/MAX1988 are intended for two different notebook CPU core applications: stepping down the battery directly or stepping down the 5V system supply to create the core voltage.
The single-stage conversion method allows these devices to directly step down highvoltage batteries for the highest possible efficiency.
Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at higher switching frequency provides the minimum possible physical size.
The MAX1987/MAX1988 meet the IMVP-IV specifications and can directly interface with the CPU powergood signals from the VCCP and VCCMCH rails within the system.
The switching regulator features power-up sequencing, automatically ramping up to the Intelspecified boot voltage.
The MAX1987/MAX1988 also feature independent four-level logic inputs for setting the boot voltage (B0 to B2) and the suspend voltage (S0 to S2).
The MAX1987/MAX1988 include output undervoltage protection, thermal protection, and system power-OK (SYSPOK) input.
When any of these protection features detect a fault, the controller shuts down.
Additionally, the MAX1987 includes overvoltage protection.
The MAX1987/MAX1988 are available in a low-profile 48-pin 7mm ✕ 7mm Thin QFN package.
Features o Dual-Phase, Quick-PWM Controllers o ±0.
75% VOUT Accur...


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