7404

ST3M01 TRIPLE VOLTAGE REGULATOR s s s s s s ONLY TWO CELL NEED AS INPUT THREE REGULATED OUTPUT 1) HIGH EFFICENCY PFM DC/DC CONVERTER 3.3V AT 200mA (87% EFFICENCY) 2) VERY LOW NOISE AND VERY LOW DROP VREG (3V AT 20mA) 3) VERY LOW NOISE AAND VERY LOW DROP VREG (1.9V AT 20mA) LOGIC CONTROLLED ELECTRONIC SHUTDOWN LOW BATTERY DETECTOR VIRTUAL GND PIN TEMPERATURA RANGE: -40 TO 85°C SO-14 SCHEMATIC DIAGRAM Vin 150 µF 15 µH IN_SW Lx DC/DC DC/DC OUT DC/DC Linear A OUT LA 1 µF IN_Linear Linear B OUT LB 1 µF Virtual GND 150 µF On-Mode Off-Mode SHDN + LBO Ref Ref - Vref 100 nF 1 KΩ GND_SW GND_Signal November 2000 1/11 ST3M01 ABSOLUTE MAXIMUM RATINGS Symbol VIN VSHDN VLX VLBO ILBO Tstg Top Shutdown Input Voltage Switch Voltage Low Battery Output Voltage Low Battery Output Maximum Current Storage Temperature Range Operating Junction Temperature Range Parameter DC Input Voltage (Both IN_Linear and IN_SW) Value -0.3 to 7 -0.3 to VIN+0.3 -0.3 to 7 -0.3 to 7 -0.3 to 7 30 30 -65 to +150 -40 to +85 Unit V V V V V mA mA °C °C Vvirtual_GND Virtual GND Output Voltage Ivirtual_GND Virtual GND Output Maximum Current THERMAL DATA Symbol Rthj-amb Parameter Thermal Resistance Junction-ambient (*) Value 160 Unit °C/W ORDER CODES Type ST3M01D ST3M01DTR Package SO-14 SO-14 (Tape & Reel) Comment 50 parts per tube / 20 tube per box 2500 parts per reel 2/11 ST3M01 CONNECTION DIAGRAM (top view) PIN DESCRIPTION Pin N° 1 2 3 4 5 6 7 Symbol GND SW GND SW Virtual GND LBO VREF IN Linear OUT LB Name and Function Switching Ground. Must be low impedance; solder directly to GND plane Switching Ground. Must be low impedance; solder directly to GND plane Virtual GND. Open Drain N-Cnannel MOSFET: must be high impedance when the Low Battery condition is detected. Low Battery Output. Open Drain N-Cnannel MOSFET: sinks current when the input voltage drops below 2V typically. Reference Voltage Output. Bypass with 0.1 µF to improve the linears VREF thermal noise performance. Linear Input. Must be connected togheter with IN SW to the input supply. Linear B Output port. 1.9V typically. 8 9 10 11 12 13 14 SHDN GND Signal OUT LA OUT DC/DC IN SW LX LX Shutdown Input. Disables the SMPS and LA output, but the LB, the referencevoltage and the low batery comparator remain active. Signal GND. Must be connected togheter with the Switching Ground. Linear A Output port. 3V typically. DC/DC Output Port: 3.3V typically. SMPS Input. Must be connected togheter with IN_Linear to the input supply. 1.5A N-Channel Power MOSFET Drain. 1.5A N-Channel Power MOSFET Drain. 3/11 ST3M01 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, please refer to the typical operating circut of the pag 1 for the external components values and connections. Unless otherwise noted VSHDN=HIGH) Symbol VI VO(DC/DC) Parameter Operating Input Voltage DC/DC Converter Output Voltage (Test Circuit A) 2.24