The MAX17000 pulse-width modulation (PWM) controller provides a complete power solution for notebook DDR, DDR2, and DDR3 memory. It comprises a step-down controller, a source-sink LDO regulator, and a reference buffer to generate the required VDDQ, VTT, and VTTR rails. The VDDQ rail is supplied by a step-down converter using Maxim’s proprietary Quick-PWM™ controller. The high-efficiency, constant-on-time PWM controller handles wide input/output voltage ratios (low duty-cycle applications) with ease and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The Quick-PWM architecture circumvents the poor load-transient timing problems of fixed-frequency current-mode PWMs while also avoiding the problems caused by widely varying switching frequencies in conventional constant-on-time and constant-off-time PWM schemes. The controller senses the current to achieve an accurate valley current-limit protection. It is also built in with overvoltage, undervoltage, and thermal protections. The MAX17000 can be set to run in three different modes: power-efficient SKIP mode, low-noise forced-PWM mode, and standby mode to support memory in notebook computer standby operation. The switching frequency is programmable from 200kHz to 600kHz to allow small components and high efficiency. The VDDQ output voltage can be set to a preset 1.8V or 1.5V, or be adjusted from 1.0V to 2.5V by an external resistor-divider.
The MAX17000 is a pulse‑width‑modulation (PWM) controller designed for notebook DDR, DDR2, and DDR3 memory power solutions. It integrates a step‑down converter, a source‑sink LDO regulator, and a reference buffer to generate VDDQ, VTT, and VTTR rails, offering programmable switching frequencies and multiple operating modes.
The document provides absolute maximum ratings, electrical characteristics, typical operating curves, fault‑detection mechanisms, and layout recommendations. It also includes detailed specifications such as input voltage range, output accuracy, quiescent current, and package information for designers.
| Switching Frequency Range | 200 kHz – 600 kHz |
|---|---|
| VTT Linear Regulator Current Capability | ±2 A source‑sink |
| Package | 24‑pin Thin QFN, 4 mm × 4 mm |
The MAX17000 can be programmed to operate between 200 kHz and 600 kHz.
It includes over‑voltage, under‑voltage, thermal shutdown, and valley current‑limit protection.