BD9322EFJ-E2 ROHM

TECHNICAL NOTE Single-chip built-in FET type Switching Regulator Series Simple Step-down Switching Regulator with Integrated Compensation BD9322EFJ, BD9323EFJ, BD9324EFJ z Description The BD9322EFJ, BD9323EFJ and BD9324EFJ are step-down regulators that integrate a low resistance high side N-channel MOSFET. It achieves 2A / 3A / 4A continuous output current over a wide input supply range. Current mode operation provides fast transient response and easy phase compensation. z Features 1) Wide operating INPUT Range 4.75V18V 2) Selectable 2A / 3A / 4A Output Current 3) Selectable 0.1 / 0.15 Internal MOSFET Switch 4) Low ESR Output Ceramic Capacitors are Available 5) Low Stanby Current during Shutdown Mode 6) 380kHz Operating Frequency 7) Feedback voltage 0.9V 1.5% Accuracy 8) Protection circuit: Undervoltage lockout protection circuit Thermal shutdown circuit Overcurrent protection circuit 9) HTSOP-J8 Package (with Exposed thermal PAD) z Applications Distributed Power System Pre-Regulator for Linear Regulator z Absolute maximum ratings (Ta = 25C) Parameter Symbol Rating Unit Supply Voltage VIN 20 V Switch Voltage VSW 20 V Power Dissipation for HTSOP-J8 Pd 3760* mW Operating Temperature Range Topr -40+85 Storage Temperature Range Tstg -55+150 Junction Temperature Tjmax 150 BST Voltage VBST VSW+7 V All other pins VOTH 7 V * Derating in done 30.08 mW/ for operating above Ta25(Mount on 4-layer 70.0mm70.0mm1.6mm board) Apr.2008 Operation Range(Ta= -4085) Parameter Symbol Min Typ Max Unit Supply Voltage VIN 4.75 12 18 V Output current for BD9322EFJ ISW2 2** A Output current for BD9323EFJ ISW3 3** A Output current for BD9324EFJ ISW4 4** A ** Pd, ASO should not be exceeded Electrical characteristics (unless otherwise specified VIN=12V Ta=25) Limits Parameter Symbol Unit Conditions Min Typ Max Error amplifier block FB input bias current I - 0.1 2 A FB Feedback voltage V 0.886 0.900 0.914 V Voltage follower FB SW block SW Hi-side FET On-resistance R - 0.15 - I = -0.8A *** ON2 SW for BD9322EFJ Hi-side FET On-resistance R - 0.10 - I = -0.8A *** ON3 SW for BD9323EFJ Hi-side FET On-resistance R - 0.10 - I = -0.8A *** ON4 SW for BD9324EFJ Lo-side FET On-resistance R - 10 - I = 0.1A ONL SW Leak current N-channel I - 0 10 A VIN= 18V , V = 0V LEAKN SW Switch Current Limit for BD9322EFJ ILIMIT2 2.5 - - A *** Switch Current Limit for BD9323EFJ ILIMIT3 3.5 - - A *** Switch Current Limit for BD9324EFJ ILIMIT4 4.5 - - A *** Maximum duty cycle M - 90 - % VFB= 0V DUTY General Enable Pull-up current IEN 12 23 34 A VEN= 0V Enable Threshold voltage VEN 0.4 0.63 0.9 V Under Voltage Lockout threshold VUVLO 4.05 4.40 4.75 V VIN rising Under Voltage Lockout Hysteresis VHYS - 0.1 - V Soft Start Current ISS 23 41 62 uA VSS= 0.1 V Soft Start Time TSS - 1.6 - ms CSS= 0.1 uF Operating Frequency FOSC 300 380 460 kHz Circuit Current ICC - 2.1 4.3 mA VFB= 1.5V, VEN= OPEN Quiescent Current IQUI - 100 190 A VEN= 0V *** See the series line-up table below. Series Line-up Table LINE-UP BD9322EFJ BD9323EFJ BD9324EFJ FET 0.15 0.10 0.10 ON-RESISTANCE OUTPUT 2.0 A 3.0A 4.0 A CURRENT 2/13