Solved by SP6133 TM Synchronous Buck Controller FEATURES 5V to 24V Input step down converter 16 15 14 13 Up to 30A output capability Highly integrated design, minimal components GL 1 12 GH UVLO Detects Both V and V CC IN SP6133 Overcurrent circuit protection with auto-restart 2 11 PGND SWN Power Good Output, ENABLE Input 3 16 Pin QFN 10 GND ISP Maximum Controllable Duty Cycle Ratio up to 92% 3mm x 3mm 9 Wide BW amp allows Type II or III compensation 4 ISN VFB Programmable Soft Start Fast Transient Response 5 6 7 8 High Efficiency: Greater than 95% possible Available in Lead Free, RoHS Compliant 6-Pin QFN package External Driver Enable/Disable U.S. Patent 6,922,04 DESCRIPTION The SP633 is a synchronous step-down switching regulator controller optimized for high efficiency. The part is designed to be especially attractive for single supply step down con- version from 5V to 24V. The SP633 is designed to drive a pair of external NFETs using a fixed 300 kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown, output short circuit protection, and overcurrent protection with auto restart. The device also features a PWRGD output and an enable input. The SP633 is available in a space saving 6-pin QFN and offers excellent thermal performance. TYPICAL APPLICATION CIRCUIT VIN C5 0.1uF C1 C2 22uF 22uF 10-15V DBST CVCC CBST MT, Si4394DY 10uF BAT54WS 0.1uF 9.75 mOhm, 30V GND VIN BST VCC GH SC5018-2R7M R3 10K 2.7uH, 15A, 4.1mOhm VOUT PWRGD SWN MB, Si4320DY POWERGOOD NC UVIN 4 mOhm, 30V RS1 RS2 C3 C4 SP6133 EN 5.11K 5.11K 100uF 100uF 3.3V GL ENABLE 0-10A GND ISP GND PGND CSP CS ISN 6.8nF 0.1uF COMP SS VFB CSS CP1 47nF R1 39 pF 68.1K, 1% CZ3 RZ3 560pF 1K R2 CF1 21.5K, 1% 22pF CZ2 RZ2 1500pF 23.2K Note: Die attach paddle is internally connected to GND. Oct 24-06 Rev L SP6 33 Synchronous Buck Controller 2006 Sipex Corporation V CC COMP EN UVI N PWRGD VI N BST SSABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maxi- Peak Output Current < 10s mum rating conditions for extended periods of time may affect reliability. GH,GL ............................................................................................. 2A V .................................................................................................. 6V CC Storage Temperature ................................................... -65C to 150C V .............................................................................................. 24.5V IN Power Dissipation ........................................................................... W BST ................................................................................................ 30V ESD Rating ........................................................................... 2kV HBM BST-SWN ........................................................................................ 7V Thermal Resistance.............................................................. 41.9C/W SWN .................................................................................-2V to 24.5V GH ..........................................................................-0.3V to BST+0.3V GH-SWN .......................................................................................... 6V All other pins ............................................................-0.3V to V +0.3V CC ELECTRICAL SPECIFICATIONS Unless otherwise specified: -40C < T < 85C, 4.5V < V < 5.5V, BST=V , SWN = GND = PGND = 0.0V, UV = 3.0V, CV AMB CC CC IN CC = 0F, C = 0. F, CGH = CGL = 3.3nF, C = 50nF, R = 0K . COMP SS PWRGD PARAMETER MIN TYP MAX UNITS CONDITIONS QUIESCENT CURRENT VIN Supply Current .5 3.0 mA VFB = V (no switching) VCC Supply Current .5 3.0 mA VFB = V (no switching) BST Supply Current 0.2 0.4 mA VFB = V (no switching) PROTECTION: UVLO VCC UVLO Start Thresh- 4.00 4.25 4.5 V old VCC UVLO Hysteresis 50 200 250 mV Apply voltage to UVIN UVIN Start Threshold 2.35 2.50 2.65 V pin Apply voltage to UVIN UVIN Hysteresis 200 300 400 mV pin VIN Start Threshold 9.0 9.5 0.0 V UVIN Floating VIN Hysteresis 300 mV UVIN Floating Enable Pullup Current 0.4 A Apply voltage to EN pin ERROR AMPLIFIER REFERENCE Error Amplifier Reference 0.792 0.800 0.808 V 2x Gain Config. Error Amplifier Reference 0.788 0.800 0.8 2 V Over Line & Temperature COMP Sink Current 70 50 230 A COMP Source Current -230 - 50 -70 A VFB Input Bias Current 50 00 nA COMP Common Mode .9 3.0 3.2 V Output Range COMP Pin Clamp Voltage 3.2 3.5 3.8 V VFB = 0.7V Oct 24-06 Rev L SP633 Synchronous Buck Controller 2006 Sipex Corporation 2