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L9788 数据表(PDF) 65 Page - STMicroelectronics |
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L9788 数据表(HTML) 65 Page - STMicroelectronics |
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65 / 264 page  DS12308 Rev 4 65/264 L9788 Multi-voltage regulator supplies 263 3.0 V ≤ VBAT(*) < 18 V, Tj -40 to 175 °C unless otherwise specified. Note: (*)VBAT is the battery line of Figure 25 in front of the limiting 22 kΩ resistor (not shown in the figure). Table 27. Pre-boost regulator output electrical characteristics Symbol Parameter Test condition Min Typ Max Unit Pin VB_IN_th BOOST enable/disable threshold When VB_IN < VB_IN_TH, the boost starts for time (tON). When VB_IN ≥ VB_IN_TH, Boost is disabled after tON is completed. tON depends on different duty cycle 8.07 8.5 8.93 V VB_IN tdBOOST_EN BOOST Enable/disable comparator delay time - 0.19 - 2 μs VB_IN Fsw_BOOST Switching frequency 43 cycles of 15 MHz main clk, Guaranteed by SCAN 334 352 370 kHz VB_IN Boost_DC1 Boost Duty cycle 1 0V < VBAT_SENSE < Vcomp_th1 33 out of 43 cycles of 15MHz main clk (100% DC is 43 clk cycles) Guaranteed by SCAN - 76.74 - % VB_IN Vcomp_th1 VBAT_SENSE comparator threshold 1 - 3.95 4.15 4.35 V VBAT_SENSE Boost_DC2 Boost Duty cycle 2 Vcomp_th1 < VBAT_SENSE < Vcomp_th2 25 out of 43 clk cycles Guaranteed by SCAN -58- % VB_IN Vcomp_th2 VBAT_SENSE comparator threshold 2 - 5 5.36 5.7 V VBAT_SENSE Boost_DC3 Boost Duty cycle 3 Vcomp_th2 < VBAT_SENSE < Vcomp_th3 18 out of 43 clk cycles Guaranteed by SCAN - 41.86 - % VB_IN Vcomp_th3 VBAT_SENSE comparator threshold 3 - 6.25 6.6 6.95 V VBAT_SENSE |
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