BL9362

V1.2 BL9362 60V, 2MHz, 600mA Step-Down Converter FEATURES GENERAL DESCRIPTION    The BL9362 is a wide input range, high-efficiency, and high frequency DC-to-DC step-down switching regulator, capable of delivering up to 0.6A of output current. With a fixed switching frequency of 2MHz, this current mode PWM controlled converter allows the use of small external components, such as ceramic input and output caps, as well as small inductors. Including cold crank and double battery jumpstarts, the minimum input voltage may be as low as 4.5V and the maximum up to 60V, with even higher transient voltages. With these high input voltages, linear regulators cannot be used for high supply currents without overheating the regulator. Instead, high efficiency switching regulators such as BL9362 must be used to minimize thermal dissipation. BL9362 is available SOT23-6 Packages.            APPLICATIONS    PIN OUT www.belling.com.cn Wide Input Operating Range from 4.5V to 60V 850mΩ internal NMOS Up to 95% Efficiency at 16V in 12V out L=47uH with 300mA loading Internal compensation Capable of Delivering 600mA continuous output current Fixed 2MHz PWM operation Internal soft start Output voltage adjustable down to 0.795V Cycle-by-cycle current limit Current Mode control Short-circuit protection Logic Control Shutdown EN can be short to VIN Thermal shutdown and UVLO Available in SOT23-6 Package 1 Smart/Industrial/Power Meters Industrial Applications Automotive Applications BL9362 PINOUT DESCRIPTION Pin # Name Description Bootstrap pin for top Switch. In Typ. application, a 0.1uF or larger capacitor should be 1 BST connected between this pin and the LX pin to supply current to the top Switch gate and top Switch driver. 2 GND 3 FB 4 EN Analog Ground Output feedback pin. In Typ. application, FB senses the output voltage and is regulated by the control loop to 795mV. Connect a resistive divider at FB. Drive EN pin high to turn on the regulator and low to turn off the regulator. Input voltage pin, In Typ. application, VIN supplies power to the IC. Connect a 4.5V to 5 VIN 60V supply to VIN and bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC. 6 LX LX is the Switching node that supplies power to the output Connect the output LC filter from LX to the output load. TYPICAL APPLICATION 100nF Vout 4.7uH~47uH 12V/0~600mA BST VIN 12.3V ~ 60V VIN LX 33pF 10uF +0.1uF FB EN 127K 10uF+0.1uF +470uF 9.09K GND 100nF 4.7uH~47uH BST VIN 5.3V ~ 60V VIN Vout 5V/0~600mA LX 33pF 10uF +0.1uF FB EN 127K 23.7K GND www.belling.com.cn 2 10uF+0.1uF +470uF BL9362 100nF Vout 4.7uH~47uH 3.3V/0~600mA BST VIN 4.5V ~ 60V VIN LX 33pF FB EN 10uF +0.1uF 127K 10uF+0.1uF +470uF 40.2K GND BLOCK DIAGRAM EN BST IN + UVLO & Thermal shutdown REG &REF Current Sense - + EA + COMP network Σ - FB PWM Logic DRIVER OSC Slope Comp GND ABSOLUTE MAXIMUM RATING Parameter Value Input Voltage Range Max Operating Junction Temperature(Tj) LX, EN Voltage BST Voltage FB Voltage LX to ground curren Operating Temperature(To) SOT23-6 Package Thermal Resistance (jc) Storage Temperature(Ts) ESD Rating -0.3V-60V 150C –0.3V to VIN+0.3V –0.3V to LX+6V –0.3V to 6V Internally limited -40C –85C 110C / W -55C - 150C 2500V Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. www.belling.com.cn 3 LX BL9362 ELECTRICAL CHARACTERISTICS (VIN = VEN = 16V, unless otherwise specified. Typical values are at TA = 25C .) SYMBOL VIN PARAMETER Input Voltage Range IQ Isd VFB ENABLE Ven_ON Ven_OFF En hys IEN MODULATOR Fosc Dmax Ton min Ilim Input Supply Current Input Shutdown Current En high level En low level En Hysteresis Enable input current Test conditions Vfb=5V no loading Ven