The MAX17000A pulse-width modulation (PWM) controller provides a complete power solution for notebook DDR, DDR2, and DDR3 memory. It comprises a stepdown 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 MAX17000A 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. This output has 1% accuracy over line-and-load operating range.
The MAX17000A includes a ±2A source-sink LDO regulator for the memory termination VTT rail. This VTT regulator has a ±5mV deadband that either sources or sinks, ideal for the fast-changing load burst present in memory termination applications. This feature also reduces output capacitance requirements.
The VTTR reference buffer sources and sinks ±3mA, providing the reference voltage needed by the memory controller and devices on the memory bus.
The MAX17000A is available in a 24-pin, 4mm x 4mm, thin QFN package.
关键特性
应用/使用
SMPS Regulator (VDDQ)
Quick-PWM with 100ns Load-Step Response
Output Voltages—Preset 1.8V, 1.5V, or Adjustable 1.0V to 2.5V
1% VOUT Accuracy Over Line and Load
26V Maximum Input Voltage Rating
Accurate Valley Current-Limit Protection
200kHz to 600kHz Switching Frequency
Source/Sink Linear Regulator (VTT)
±2A Peak Source/Sink
Low-Output Capacitance Requirement
Output Voltages-Preset VDDQ/2 or REFIN Adjustable from 0.5V to 1.5V
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