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MAX8757 Dataheets PDF



Part Number MAX8757
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Dual Power-Supply Controller
Datasheet MAX8757 DatasheetMAX8757 Datasheet (PDF)

19-3569; Rev 2; 4/07 EVAALVUAAILTAIOBNLEKIT Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers MAX8716/MAX8717/MAX8756/MAX8757 General Description The MAX8716/MAX8717/MAX8756/MAX8757 are dual, step-down, interleaved, fixed-frequency, switch-mode power-supply (SMPS) controllers with synchronous rectification. The MAX8716/MAX8717/MAX8756/MAX8757 are intended for main (5V/3.3V) power generation, while the MAX8756 is optimized for I/O power rails in batterypowered sy.

  MAX8757   MAX8757


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19-3569; Rev 2; 4/07 EVAALVUAAILTAIOBNLEKIT Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers MAX8716/MAX8717/MAX8756/MAX8757 General Description The MAX8716/MAX8717/MAX8756/MAX8757 are dual, step-down, interleaved, fixed-frequency, switch-mode power-supply (SMPS) controllers with synchronous rectification. The MAX8716/MAX8717/MAX8756/MAX8757 are intended for main (5V/3.3V) power generation, while the MAX8756 is optimized for I/O power rails in batterypowered systems. Fixed-frequency operation with optimal interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Optimal 40/60 interleaving allows the input voltage to go down to 8.3V before duty-cycle overlap occurs in 5V/3.3V applications, compared to 180° out-of-phase regulators where the dutycycle overlap occurs when the input drops below 10V. Accurate output current limit is achieved using a sense resistor. Alternatively, power dissipation can be reduced using lossless inductor current sensing. Independent ON/OFF controls and power-good signals allow flexible power sequencing. Soft-start reduces inrush current, while soft-stop gradually ramps the output voltage down preventing negative voltage dips. A low-noise mode maintains high light-load efficiency while keeping the switching frequency out of the audible range. The MAX8716 is available in a 24-pin thin QFN package, and the MAX8717/MAX8756/MAX8757 are available in a 28-pin thin QFN package. Applications 2 to 4 Li+ Cell Battery-Powered Devices Notebook and Subnotebook Computers PDAs and Mobile Communicators Main or I/O Power Supplies Dual Mode is a trademark of Maxim Integrated Products, Inc. Features o Fixed Switching Frequency 200kHz, 300kHz, or 500kHz 250kHz, 300kHz, or 400kHz (MAX8756 Only) o No Current-Sense Resistor Required o 40/60 Optimal Interleaving o Reduced Input-Capacitor Requirement o Output Voltage Fixed or Adjustable Outputs (Dual Mode™) 3.3V/5V Fixed or 1V to 5.5V Adjustable 1.5V/1.8V Fixed or 1V to 2.3V Adjustable (MAX8756 Only) o 4V to 26V Input Range o Independently Selectable PWM, Skip, and LowNoise Mode Operation o Soft-Start and Soft-Stop o 2V Precision Reference with 0.75% Accuracy o Independent Power-Good Outputs Ordering Information PART TEMP RANGE PINPACKAGE PKG CODE MAX8716ETG -40°C to +85°C 24 Thin QFN 4mm x 4mm T2444-4 MAX8716ETG+ -40°C to +85°C 24 Thin QFN 4mm x 4mm T2444-4 MAX8717ETI -40°C to +85°C 28 Thin QFN 5mm x 5mm T2855-6 +Denotes a lead-free package. Ordering Information continued at end of data sheet. Pin Configurations TOP VIEW LX2 DL2 VDD GND DL1 LX1 18 17 16 15 14 13 DH1 19 BST1 20 CSH1 21 CSL1 22 FB1 23 PGOOD1 24 + MAX8716ETG 123 4 56 12 DH2 11 BST2 10 CSH2 9 CSL2 8 FB2 7 PGOOD2 ON2 ON1 SKIP2 REF SKIP1 VCC TQFN A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES. TOP VIEW LX1 DL1 AGND PGND VDD DL2 LX2 21 20 19 18 17 16 15 DH1 22 14 DH2 BST1 23 13 BST2 CSH1 24 12 CSH2 CSL1 25 FB1 26 PGOOD1 27 MAX8717ETI MAX8756ETI+ MAX8757ETI+ 11 CSL2 10 FB2 9 PGOOD2 ILIM1 28 + 123456 7 8 ILIM2 VCC SKIP1 REF SKIP2 FSEL ON1 ON2 TQFN ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX8716/MAX8717/MAX8756/MAX8757 Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers ABSOLUTE MAXIMUM RATINGS (Note 1) VDD, VCC, CSL1, CSH1, CSL2, CSH2 to AGND ......-0.3V to +6V ON1, ON2, SKIP1, SKIP2, PGOOD1, PGOOD2 to AGND ...............................................-0.3V to +6V FB1, FB2, ILIM1, ILIM2, FSEL to AGND ...................-0.3V to +6V REF to AGND..............................................-0.3V to (VCC + 0.3V) BST1, BST2 to AGND .............................................-0.3V to +36V LX1 to BST1..............................................................-6V to +0.3V LX2 to BST2..............................................................-6V to +0.3V DH1 to LX1 ..............................................-0.3V to (VBST1 + 0.3V) DH2 to LX2 ..............................................-0.3V to (VBST2 + 0.3V) DL1, DL2 to PGND .....................................-0.3V to (VDD + 0.3V) AGND to PGND .....................................................-0.3V to +0.3V REF Short Circuit to AGND.........................................Continuous REF Current ......................................................................+10mA Continuous Power Dissipation (TA = +70°C) 24-Pin Thin QFN 4mm x 4mm (derate 20.8mW/°C above +70°C)..........................................................1666.7mW 28-Pin Thin QFN 5mm x 5mm (derate 21.3mW/°C above +70°C)..........................................................1702.1mW Operating Temperature Range ...........................-40°C to +85°C Junction Te.


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