MAX8716/MAX8717/MAX8756/MAX8757 19-3569 Rev 2 4/07 Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers General Description Features The MAX8716/MAX8717/MAX8756/MAX8757 are dual, Fixed Switching Frequency step-down, interleaved, fixed-frequency, switch-mode 200kHz, 300kHz, or 500kHz power-supply (SMPS) controllers with synchronous rec- 250kHz, 300kHz, or 400kHz (MAX8756 Only) tification. The MAX8716/MAX8717/MAX8756/MAX8757 No Current-Sense Resistor Required are intended for main (5V/3.3V) power generation, while 40/60 Optimal Interleaving the MAX8756 is optimized for I/O power rails in battery- Reduced Input-Capacitor Requirement powered systems. Output Voltage Fixed or Adjustable Outputs Fixed-frequency operation with optimal interleaving min- (Dual Mode) imizes input ripple current from the lowest input voltages 3.3V/5V Fixed or 1V to 5.5V Adjustable up to the 26V maximum input. Optimal 40/60 interleav- 1.5V/1.8V Fixed or 1V to 2.3V Adjustable ing allows the input voltage to go down to 8.3V before (MAX8756 Only) duty-cycle overlap occurs in 5V/3.3V applications, com- 4V to 26V Input Range pared to 180 out-of-phase regulators where the duty- cycle overlap occurs when the input drops below 10V. Independently Selectable PWM, Skip, and Low- Noise Mode Operation Accurate output current limit is achieved using a sense resistor. Alternatively, power dissipation can be Soft-Start and Soft-Stop reduced using lossless inductor current sensing. 2V Precision Reference with 0.75% Accuracy Independent ON/OFF controls and power-good signals Independent Power-Good Outputs allow flexible power sequencing. Soft-start reduces inrush current, while soft-stop gradually ramps the out- Ordering Information put voltage down preventing negative voltage dips. A low-noise mode maintains high light-load efficiency PIN- PKG PART TEMP RANGE while keeping the switching frequency out of the audi- PACKAGE CODE ble range. 24 Thin QFN The MAX8716 is available in a 24-pin thin QFN pack- MAX8716ETG -40C to +85C T2444-4 4mm x 4mm age, and the MAX8717/MAX8756/MAX8757 are avail- 24 Thin QFN able in a 28-pin thin QFN package. MAX8716ETG+ -40C to +85C T2444-4 4mm x 4mm Applications 28 Thin QFN MAX8717ETI -40C to +85C T2855-6 2 to 4 Li+ Cell Battery-Powered Devices 5mm x 5mm Notebook and Subnotebook Computers +Denotes a lead-free package. PDAs and Mobile Communicators Ordering Information continued at end of data sheet. Main or I/O Power Supplies Dual Mode is a trademark of Maxim Integrated Products, Inc. Pin Configurations TOP VIEW TOP VIEW 18 17 16 15 14 13 21 20 19 18 17 16 15 DH1 DH2 22 14 DH1 19 12 DH2 BST1 23 13 BST2 BST1 20 11 BST2 CSH1 24 12 CSH2 CSH1 21 10 CSH2 MAX8716ETG CSL1 25 11 CSL2 CSL1 22 9 CSL2 MAX8717ETI MAX8756ETI+ FB1 23 8 FB2 FB1 26 10 FB2 MAX8757ETI+ PGOOD1 24 7 PGOOD2 PGOOD1 27 9 PGOOD2 + ILIM1 28 8 ILIM2 1 2 3 4 5 6 + 1 2 3 4 5 6 7 TQFN TQFN A SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE V LX1 CC SKIP1 DL1 REF GND SKIP2 VDD ON1 DL2 ON2 LX2 V LX1 CC SKIP1 DL1 REF AGND SKIP2 PGND FSEL VDD ON1 DL2 ON2 LX2Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers ABSOLUTE MAXIMUM RATINGS (Note 1) V , V , CSL1, CSH1, CSL2, CSH2 to AGND ......-0.3V to +6V REF Short Circuit to AGND.........................................Continuous DD CC ON1, ON2, SKIP1, SKIP2, PGOOD1, REF Current ......................................................................+10mA PGOOD2 to AGND...............................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A FB1, FB2, ILIM1, ILIM2, FSEL to AGND...................-0.3V to +6V 24-Pin Thin QFN 4mm x 4mm (derate 20.8mW/C REF to AGND..............................................-0.3V to (V + 0.3V) above +70C)..........................................................1666.7mW CC BST1, BST2 to AGND.............................................-0.3V to +36V 28-Pin Thin QFN 5mm x 5mm (derate 21.3mW/C LX1 to BST1..............................................................-6V to +0.3V above +70C)..........................................................1702.1mW LX2 to BST2..............................................................-6V to +0.3V Operating Temperature Range ...........................-40C to +85C DH1 to LX1 ..............................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C BST1 DH2 to LX2 ..............................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C BST2 DL1, DL2 to PGND .....................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD AGND to PGND.....................................................-0.3V to +0.3V Note 1: For the 24-pin TQFN version, AGND and PGND refer to a single pin designated GND. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, V = 12V, FSEL = REF, SKIP = 0, V = V = V = V = 5V T = 0C to +85C, unless otherwise noted. IN ON ILIM CC DD , A Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLIES V 26 IN Input Voltage Range V V V , V 4.5 5.5 BIAS CC DD V rising 3.9 4.15 4.4 CC V Undervoltage-Lockout 200mV typical CC V V UVLO Threshold hysteresis V falling 3.7 3.95 4.2 CC MAX8716, MAX8717, CSL and FB forced 0.8 1.3 MAX8757 Quiescent Supply Current (V)I above their regulation mA CC CC points MAX8756 1 1.8 CSL and FB forced above their regulation Quiescent Supply Current (V)I < 1 5 A DD DD points Shutdown Supply Current (V ) ON1 = ON2 = GND < 1 5 A CC Shutdown Supply Current (V ) ON1 = ON2 = GND < 1 5 A DD MAIN SMPS CONTROLLERS MAX8716, MAX8717, V = 6V to 26V, IN 3.265 3.30 3.365 PWM1 Output Voltage in MAX8757 V SKIP1 = V , V OUT1 CC Fixed Mode zero to full load MAX8756 1.484 1.50 1.530 MAX8716, MAX8717, V = 6V to 26V, IN 4.94 5.00 5.09 PWM2 Output Voltage in MAX8757 V SKIP2 = V , V CC OUT2 Fixed Mode zero to full load MAX8756 1.778 1.800 1.832 V = 6V to 26V, FB1 or FB2, IN 0.990 1.005 1.020 Feedback Voltage in Adjustable duty factor = 20% to 80% V V FB Mode (Note 2) V = 6V to 26V, FB1 or FB2, IN 0.995 1.005 1.015 duty factor = 50% MAX8716, MAX8717, 1.0 5.5 MAX8757 Output-Voltage-Adjust Range Either SMPS V MAX8756 1.0 2.3 2 MAX8716/MAX8717/MAX8756/MAX8757