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L9945 データシート(PDF) 22 Page - STMicroelectronics |
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L9945 データシート(HTML) 22 Page - STMicroelectronics |
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22 / 151 page  Figure 11. Charge pump connections Ratings: CTANK: 16 V CFLY1, CFLY2: 50 V for 12 V systems, 100 V for 24 V systems. X Charge Pump X X X X X CTANK CH1 CH2 CH3 CH4 VGBHI VPS Battery CFLY1 CFLY2 GADG2702170853PS The table below lists the electrical characteristics of the charge pump: Note: Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V, unless otherwise noted. Table 11. Charge pump electrical characteristics Symbol Parameter Test Condition Min. Typ. Max. Unit VVGBHI Charge pump voltage versus charge pump load current VVPS ≥ 8 V; IVGBHI = 15 mA (DC) VVPS+9 VVPS+12 VVPS+16 V VVPS_UV ≤ VVPS < 8 V; IVGBHI = 6 mA (DC) VVPS+5 - VVPS+16 V fCP Charge pump frequency Dependent on tSYS 184 200 216 kHz CTANK Charge pump tank capacitor Connected to VPS IVGBHI = 15 mA 420 470 520 nF CFLY Charge pump flying capacitors Connected between CH1-CH2, CH3-CH4; IVGBHI = 15 mA 198 220 242 nF VCP_UV Under voltage threshold Referenced to VVPS VVPS+3.9 - VVPS+5.1 V VhCP_UV Under voltage hysteresis Referenced to VVPS 250 - mV tCP_UV Under voltage filter time - 10 - 30 µs VVGBHI_MAX Charge pump max voltage Referenced to GND - - 80 V tCPstartup Startup time - - - 2 ms IBIAS_ON Internal absorption in when VGNSPx = ON Design info. Not tested in ATE - - 530 µA IBIAS_OFF Internal absorption in when VGNSPx = OFF Design info. Not tested in ATE - - 480 µA 5.2.5 VIO supply pin & SDO pin characteristics The VIO supply pin is used to feed SDO output driver. It can be connected either to 5 V or 3.3 V supply, in order to be compatible with different external I/O logic. In case of an overvoltage condition at the SDO output, the SDO driver is switched off and eventual back feeding current towards VIO is blocked. Once the over-voltage is removed from SDO-pin, the output is re-activated at NCS low-to-high transition. SDO overvoltage event is latched in SDO_OV_LATCH, cleared via SPI readout. Table below lists the electrical characteristics for the SDO output pin. L9945 Supply concept DS12275 - Rev 8 page 22/151 |
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