Part # MAX8632 datasheet

Part Manufacturer: Maxim


Part Description: MAX8632 DS

Part Details:

19-3623; Rev 1; 10/05 EVALUATION KIT AVAILABLE Integrated DDR Power-Supply Solution for Desktops, Notebooks, and Graphic Cards MAX8632 General Description Features The MAX8632 integrates a synchronous-buck PWM con- Buck Controller troller to generate VDDQ, a sourcing and sinking LDO lin- Quick-PWM with 100ns Load-Step Response ear regulator to generate VTT, and a 10mA reference output buffer to generate VTTR. The buck controller dri- Up to 95% Efficiency ves two external n-channel MOSFETs to generate output 2V to 28V Input Voltage Range voltages down to 0.7V from a 2V to 28V input with output 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output currents up to 15A. The LDO can sink or source up to Up to 600kHz Selectable Switching Frequency 1.5A continuous and 3A peak current. Both the LDO out- Programmable Current Limit with Foldback put and the 10mA reference buffer output can be made Capability to track the REFIN voltage. These features make the 1.7ms Digital Soft-Start MAX8632 ideally suited for DDR memory applications indesktops, notebooks, and graphic cards. Independent Shutdown and Standby Controls Overvoltage-/Undervoltage-Protection Option The PWM controller in the MAX8632 utilizes Maxim sproprietary Quick-PWMTM architecture with programma- Power-Good Window Comparator ble switching frequencies of up to 600kHz. This control LDO Section scheme handles wide input/output voltage ratios with Fully Integrated VTT and VTTR Capability ease and provides 100ns response to load transients VTT Has ±3A Sourcing/Sinking Capability while maintaining high efficiency and a relatively con- Only 20µF Ceramic Capacitance Required for VTT stant switching frequency. The MAX8632 offers fully pro- VTT and VTTR Outputs Track VREFIN / 2 grammable UVP/OVP and skip-mode options ideal in portable applications. Skip mode allows for improved All-Ceramic Output-Capacitor Designs efficiency at lighter loads. 1.0V to 2.8V Input Voltage Range The VTT and VTTR outputs track to within 1% of V Power-Good Window Comparator REFIN / 2. The high bandwidth of this LDO regulator allows excel-lent transient response without the need for bulk capac- Ordering Information itors, thus reducing cost and size. PART

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MAX8632.pdf Datasheet