Rainbow Electronics MAX1874 - Manual (Page 3)

MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
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ELECTRICAL CHARACTERISTICS (continued)
(V USB = V DC = V DCLV = V EN = V USEL = 5V, V BATT = 4.2V, V THRM = V REF / 2, Circuit of Figure 2, T A = 0°C to +85°C, unless otherwise
noted. Typical values are at T A = +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
BATTERY CHARGING AND PRECHARGE CURRENT
DCI Voltage Range 0.1 x V REF V REF V
V DCI = V REF 950 1000 1050
DCI Voltage to BATT Current
V DCI = V REF / 2 490 520 550
mA
USEL = high 455 495
USB Charging Current
USEL = low 82 95
mA
Soft-Start Current-Ramp Time Measured from 10% to 90% 7 ms
Prequal Charging Current V BATT = 2.5V 35 55 70 mA
BATT Input Current No DC or USB power, V BATT = 4.2V 5 7.5 µA
BATT Shutdown Current EN = GND, USB- and/or DC-powered 1 2 µA
THERMISTOR MONITOR AND DIE-TEMPERATURE REGULATION
THRM COLD Trip Level (Note 2) 0.72 0.74 0.76 V REF
THRM HOT Trip Level (Note 2) 0.28 0.29 0.30 V REF
THRM Disable Threshold 50 100 150 mV
Internal Die Thermal Limit +105 °C
LOGIC INPUT/OUTPUTS AND GATE DRIVERS
PON High Output Resistance
PON pulled up to active input (DCLV or USB),
V
DCLV or V USB = 5V
25 Ω
PON Low Output Resistance PON resistance to GND, V DCLV = V USB = 0 120 k Ω
DCOK Low Output Resistance DCOK pulled low 25 Ω
DCOK Off-Leakage Current V DCOK = 12V, V DC = 0V 1 µA
UOK Output Resistance UOK resistance to GND, V
DC = 0 25 Ω
UOK Off-Leakage Current V UOK = 6.5V 1 µA
DC input (% of charge current set at DCI) 8 12.5 19
U S B i np ut, U S E L = 5V ( % of U S B char g i ng cur r ent) 20 25 30 CHG Threshold to Indicate Battery Full,
Battery Current Falling (Note 3)
USB input with USEL = 0
Voltage
mode
%
CHG Logic-Low Output Sinking 10mA sink 0.4 V
CHG Leakage Current V CHG = 6.5V 1 µA
EN, USEL Logic-Input High Level 1.6 V
EN, USEL Logic-Input Low Level 0.4 V
EN, USEL Input Bias Current 1 µA