SP7650 Wide Input Voltage Range 3A, TM 300kHz, Buck Regulator Power Blox SP7650 DFN PACKAGE SP7650 7mm x 4mm FEATURES DFN PACKAGE 7mm x 4mm 2.5V to 28V Step Down Achieved Using Dual Input 26 P LX 1 GND BOTTOM VIEW Output Voltage down to 0.8V P GND 1 26P LX 25 GND LX 2 Heatsink Pad 1BOTTOM VIEW 3A Output Capability P GND 2 LX 24 25P LX Connect to Lx 3 GND Heatsink Pad 1 Built in Low R Power Switches (40 m1 typ) DSON P GND 3 LX Connect to Lx 24 23 Pin 27 GND LX 4 Highly Integrated Design, Minimal Components GND 4 23 LX 5 V 22 FB V CC 300 kHz Fixed Frequency Operation V FB 5 22 V CC 21 6 COMP GND UVLO Detects Both V and V CC IN Heatsink Pad 2 COMP 21 GND 6 Connect to GND UV 7 IN 20 GND Heatsink pad 2 Over Temperature Protection UVIN 7 Connect to GND 20 GND 8 GND 19 GND Short Circuit Protection with Auto-Restart Pin 28 GND 8 19 GND 9 SS BST 18 Wide BW Amp Allows Type II or III Compensation SS 9 18 BST V NC 17 10 IN Programmable Soft Start Heatsink Pad 3 V IN 10 Connect to VIN 17 NC V Fast Transient Response 11 IN LX 16 Heatsink pad 3 V 11 16 LX IN Connect to V High Efficiency: Greater than 95% Possible 12 V LX 15 IN IN V 15 LX IN 12 Pin 29 Asynchronous Start-Up into a Pre-Charged Output 13 V LX 14 IN V 14 LX IN 13 Small 7mm x 4mm DFN Package U.S. Patent 6,922,041 Now Available in Lead Free Packaging DESCRIPTION The SP7650 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed to be especially attractive for dual supply, 12V or 24V distributed power systems stepped down with 5V used to power the controller. This lower V voltage minimizes power dissipation in the part and is used to drive the top switch. The CC SP7650 is designed to provide a fully integrated buck regulator solution using a fixed 300kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP7650 is available in the space saving DFN package. TYPICAL APPLICATION CIRCUIT U1 SP7650 L1 1 26 PGND LX VOUT 2.2uH, Irate=4.78A 2 25 RZ2 PGND LX 3.3V CZ2 RZ3 3 24 0-3A PGND LX 7.15k 1 ,1% 1,000pF 15k 1 ,1% C3 4 23 +5V VCC GND LX R1 47uF CP1 5 22 68.1k 1 ,1% VFB VCC 6.3V CZ3 22pF 6 21 150pF COMP GND CVCC 7 20 2.2uF UVIN GND CF1 ENABLE 8 19 100pF GND GND DBST 9 18 RSET SS BST 10 17 21.5k 1 ,1% VIN NC SD101AWS CSS (note 2) 47nF 11 16 VIN LX CBST 12 15 VIN LX 6800pF 13 14 VIN LX VIN 12V fs=300Khz C1 Notes: 22uF 16V 1. U1 Bottom-Side Layout should have three contacts isolated from GND one another: Vin, SWNODE and GND. 2. RSET=54.48/(Vout-0.8V) (KOhm) Date: 2/16/06 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator Copyright 2006 Sipex Corporation Date: / 5/06 SP7650 Wide Input V oltage Range 3A, 300kHz, Buck Regulator Copyright 2006 Sipex Corporation 1 ABSOLUTE 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 maximum rating conditions for extended periods of time may affect reliability. V ................................................................................................... 7V All other pins .......................................................... -0.3V to V +0.3V CC CC V ........................................................................................................................................... 30V IN I ............................................................................................................................................... 5A Storage Temperature .................................................. -65C to 150 C LX BST ............................................................................................... 35V Power Dissipation ...................................... Internally Limited via OTP LX-BST ............................................................................. -0.3V to 7V ESD Rating .......................................................................... 2kV HBM LX ....................................................................................... -1V to 30V Thermal Resistance V .................................................................................... 5 C/W JC ELECTRICAL SPECIFICATIONS Unless otherwise specified: -40 C < T < 85 C, -40 C< Tj< 125 C, 4.5V < V < 5.5V, 3V< Vin< 28V, BST=LX + 5V, LX = AMB CC GND = 0.0V, UVIN = 3.0V, CV = 1 F, C = 0.1 F, C = 50nF, Typical measured at V = 5V. The z denotes the CC COMP SS CC specifications which apply over the full temperature range, unless otherwise specified. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS QUIESCENT CURRENT V 1.5 3 mA VFB = 0.9V CC Supply Current (No switching) V 4 6 mA z CC Supply Current (switching) BST Supply Current (No switching) 0.2 0.4 mA VFB = 0.9V z BST Supply Current (switching) 4 4 6 mA PROTECTION: UVLO V 4.00 4.25 4.5 V CC UVLO Start Threshold V UVLO Hysteresis 100 200 300 mV CC z UVIN Start Threshold 2.3 2.5 2.65 V UVIN Hysteresis 200 300 400 mV UVIN Input Current 1 A UVIN = 3.0V ERROR AMPLIFIER REFERENCE 2X Gain Config., Measure Error Amplifier Reference 0.792 0.800 0.808 V V V = 5 V, T = 25C FB CC Error Amplifier Reference 0.788 0.800 0.812 V z Over Line and Temperature Error Amplifier Transconductance 6 mA/V Error Amplifier Gain 60 dB No Load COMP Sink Current 150 A VFB= 0.9V, COMP = 0.9V COMP Source Current 150 A VFB= 0.7V, COMP = 2.2V V Input Bias Current 50 200 nA VFB= 0.8V FB Internal Pole 4 MHz COMP Clamp 2.5 V VFB= 0.7V, TA = 25C COMP Clamp Temp. Coefficient -2 mV/C Date: 2/16/06 SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator Copyright 2006 Sipex Corporation Date: / 5/06 SP7650 Wide Input V oltage Range 3A, 300kHz, Buck Regulator Copyright 2006 Sipex Corporation 2 2