Part # MAX8744A-MAX8745A datasheet

Part Manufacturer: Maxim

Maxim

Part Description: MAX8744A-45A - DS


Part Details:

19-0839; Rev 0; 6/07 EVALUATION KIT AVAILABLE High-Efficiency, Quad-Output, Main Power- Supply Controllers for Notebook Computers MAX8744A/MAX8745A General Description Features The MAX8744A/MAX8745A are dual step-down, switch- o Fixed-Frequency, Current-Mode Control mode, power-supply (SMPS) controllers with synchro- o 40/60 Optimal Interleaving nous rectification, intended for main 5V/3.3V power o Internal BST Switches generation in battery-powered systems. Fixed-frequency o Internal 5V, 100mA Linear Regulator operation with optimal interleaving minimizes input rip- o ple current from the lowest input voltages up to the 26V Auxiliary Linear-Regulator Driver (12V orAdjustable Down to 1V) maximum input. Optimal 40/60 interleaving allows theinput voltage to go down to 8.3V before duty-cycle o Dual ModeTM Feedback--3.3V/5V Fixed or overlap occurs, compared to 180° out-of-phase regula- Adjustable Output Voltages tors where the duty-cycle overlap occurs when the o 200kHz/300kHz/500kHz Switching Frequency input drops below 10V. o Undervoltage and Thermal-Fault Protection Output current sensing provides peak current-limit pro- o Overvoltage-Fault Protection (MAX8744A Only) tection, using either an accurate sense resistor or using o 6V to 26V Input Range lossless inductor DCR current sensing. A low-noise o 2V ±0.75% Reference Output mode maintains high light-load efficiency while keeping o Independent Enable Inputs and Power-Good the switching frequency out of the audible range. Outputs An internal, fixed 5V, 100mA linear regulator powers up o Soft-Start and Soft-Shutdown (Voltage Ramp) the MAX8744A/MAX8745A and their gate drivers, as o 8µA (typ) Shutdown Current well as external keep-alive loads. When the main PWMregulator is in regulation, an automatic bootstrap switch Ordering Information bypasses the internal linear regulator, providing currentup to 200mA. An additional adjustable linear-regulator PIN- PKG PART TEMP RANGE driver with an external pnp transistor can be used with PACKAGE CODE a secondary winding to provide a 12V supply, or pow- 32 Thin QFN ered directly from the main outputs to generate low-


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MAX8744A-MAX8745A.pdf Datasheet