ML1538

ML1538 _______________________________________________________________ ML1538 4-ch Motor Driver for Portable CD players ™ Application ‹ Portable CD player ™ Features z Built-in 4ch H bridge driver, and PWM control of load drive voltage is made possible by external components. DC-DC converter control circuit on chip. With inverted reset output pin. Empty detection level can be switched between rechargeable battery and dry battery. Constant current charging; amount of current can be varied by external resistor. Built-in power transistor for charging. Built-in independent thermal shutdown circuit Package : QFP-44 z z z z z z z www.DataSheet4U.com ™ General Description ML1538 driver IC contains a 4ch H bridge driver and DC-DC converter control circuit, and was developed for portable CD players. The package in use is QFP-44, making it ideal for smaller set. 4ch Motor Driver for Portable CD Player 1/17 March, 2004 V1.0 ML1538 _______________________________________________________________ ™ Block Diagram RCHG OUT1R OUT1F OUT2R OUT2F POWGND OUT3F OUT3R OUT4F OUT4R BRAKE1 33 32 31 30 29 28 27 26 25 24 23 BRAKE1 AMUTE 34 35 36 37 38 39 40 41 42 43 44 + + + + ++ 4 DEAD Control Circuit Pow er Supply 22 IN1 MUTE2 BTL BTL TSD MAXIMUM DETECTION + POWER OFF STARTER BTL BTL V / I V / I V / I V / I EMP 21 MUTE2 20 IN2 HV CC PSW + + + + MUTE34 19 MUTE34 18 IN4 17 IN3 16 Vref 15 VSYS2 14 OP+ 13 OPOUT 12 VSYS1 CLK START OFF Pre-Driver Pow er Supply CHGVCC TSD ...