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MC34708 数据表(PDF) 64 Page - Freescale Semiconductor, Inc |
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MC34708 数据表(HTML) 64 Page - Freescale Semiconductor, Inc |
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64 / 159 page  Analog Integrated Circuit Device Data Freescale Semiconductor 64 MC34708 Functional Block Description SWBST can be controlled by SPI programming in PFM, PWM, and Auto mode. Auto mode transitions between PFM and PWM mode based on the load current. By default SWBST is powered up in Auto mode. Table 52. SWBST Mode Control Parameter Voltage SWBST Mode SWBSTMODE[1:0] SWBSTSTBYMODE[1:0] 00 Off 01 PFM 10 Auto (default) 11 PWM Table 53. SWBST Electrical Specifications Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C TA 85 C, unless otherwise noted. Typical values at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Symbol Characteristic Min Typ Max Unit Notes SWITCH MODE SUPPLY SWBST VSWBST Average Output Voltage •3.0 V < VIN < 4.5 V, 0 < IL < ILMAX Nom-4% VNOM Nom+3% V (55) VSWBSTACC Output Ripple •3.0 V < VIN < 4.5 V 0 < IL < ILMAX, excluding reverse recovery of Schottky diode - - 120 mV Vp-p SWBSTACC Average Load Regulation •VIN = 3.6 V, 0 < IL < ILMAX - 0.5 - mV/mA VSWBST LINEAREG Average Line Regulation •3.0 V < VIN < 4.5 V IL = ILMAX - 50 - mV ISWBST Continuous Load Current •3.0 V < VIN < 4.5 V, VOUT = 5.0 V - 380 - mA ISWBSTPEAK Peak Current Limit • At SWBSTIN, VIN = 3.6 V - 1800 - mA VSWBSTOS- START Start-up Overshoot, IL = 0 mA - - 500 mV tON-SWBST Turn-on Time • Enable to 90% of VOUT IL = 0 - - 2.0 ms fSWBST Switching Frequency - 2.0 - MHz VSWBST TRANSIENT Transient Load Response, IL from 1.0 to 100 mA in 1.0 µs • Maximum transient Amplitude - - 300 mV VSWBST TRANSIENT Transient Load Response, IL from 100 to 1.0 mA in 1.0 µs • Maximum transient Amplitude - - 300 mV VSWBST TRANSIENT Transient Load Response, IL from 1.0 to 100 mA in 1.0 µs • Time to settle 80% of transient - - 500 µs VSWBST TRANSIENT Transient Load Response, IL from 100 to 1.0 mA in 1.0 µs • Time to settle 80% of transient - - 20 ms SWBST Efficiency, IL = ILMAX 65 80 - % ISWBSTBIAS Bias Current Consumption • PFM or Auto mode - 35 - µA |
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