Controller IC Chip - Mofset Maxim Max1988 1988 chip for laptop - Integrated Laptop Chip (Code 1-CHIP0647)

Controller IC Chip - Mofset Maxim Max1988 1988 chip for laptop- Integrated portable calculator chip(SKU.1-CHIP0647)

Dual-Phase, Quick-PWM Controllers for IMVP-IV CPU Core Power Supplies

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.

♦ Dual-Phase, Quick-PWM Controllers ♦ ±0.75% VOUT Accuracy Over Line, Load, and Temperature ♦ Active Voltage Positioning with Adjustable Gain and Offset ♦ 6-Bit On-Board DAC (16mV Increments) ♦ 0.492V to 1.708V Output Adjust Range ♦ Selectable 200kHz/300kHz/550kHz Switching Frequency ♦ 2V to 28V Battery Input Voltage Range ♦ Adjustable Slew Rate Control ♦ Drives Large Synchronous Rectifier MOSFETs ♦ Output Overvoltage Protection (MAX1987 Only) ♦ Undervoltage and Thermal Fault Protection ♦ IMVP-IV Power Sequencing and Timing ♦ Selectable Boot and Suspend Voltages ♦ Low-Profile 7mm ✕ 7mm 48-Pin Thin QFN Package

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