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LP28400 Datasheet(PDF) 8 Page - Lowpower Semiconductor inc |
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LP28400 Datasheet(HTML) 8 Page - Lowpower Semiconductor inc |
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8 / 17 page  Preliminary Datasheet LP28400 LP28400-00 Version 1.0 May.-2013 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 8 of 17 BTST, SW, SRP, SRN, VAVCC > VUVLO, VAVCC > VSRN, ISET > 120mV, VBAT=8.4V, Charge done 25 uA VFLOAT Regulated Output (Float) Voltage CELL = VREF, TJ = 0°C to 85°C LP28400 4.158 4.2 4.242 V CELL = GND, TJ = 0°C to 85°C LP28400 8.358 8.4 8.442 V Fsw PWM Switching Frequency 1.32 1.5 1.68 MHz VISET ISET Voltage Range 0 VREF V IISET ISET Input Bias Current 25 -25 uA VSRP-SRN-CC Charge Current Full Scale Sense Voltage VISET=VREF 71 75 79 mV VISET=Float 46 50 54 mV VISET=AGND 21 25 29 mV VSRP-SRN-CP Charge Current Full Scale Sense Voltage in Pre-Charge VISET=VREF 7.1 7.5 7.9 mV VISET=Float 4.6 5.0 5.4 mV VISET=AGND 2.1 2.5 2.9 mV TTERM_DEG Deglitch time VSRN > VRECH and ICHG < ITERM 100 mS VLOWV Precharge to fast charge transition threshold CELL = VREF, measured on SRN 2.85 2.9 2.95 V CELL = AGND, measured on SRN 5.7 5.8 5.9 V VLOWV_HYS Fast charge to precharge hysteresis CELL = VREF, measured on SRN 200 mV CELL = AGND, measured on SRN 400 mV KTERM Termination set factor Termination of fast charge current 10% VRECHG Recharge Threshold, below regulation voltage limit, VBAT_REG-VSRN CELL=VREF ,measured on SRN 100 130 160 mV CELL=GND, measured on SRN 200 260 320 mV TPRE-CHARGE Pre-Charge Timer 1848 2100 2352 S TFAST-CHARGE Fast-Charge Timer 22176 25200 28224 S VVREF_REG VREF regulator voltage VAVCC > VUVLO, No load 3.13 3.3 3.47 V IVREF_LIM VREF current limit VVREF=0V,VAVCC> VUVLO 40 mA VREGN_REG REGN regulator voltage VAVCC > 10 V 5 5.3 5.6 V IREGN_LIM REGN current limit VREGN = 0 V, VAVCC > 10V 50 mA RDS High-Side Ron VBS-VSW=5V 110 mΩ Low-Side Ron VREGN=5V 110 mΩ RDS_BAT_OFF BATFET Turn-off Resistance VAVCC > 5V 100 Ω RDS_BAT_ON BATFET Turn-on Resistance VAVCC > 5V 20 KΩ VBATDRV_REG BATFET Drive Voltage VBATDRV_REG =VACN - VBATDRV when VAVCC > 4.2 7 V |
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