MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
_______________________________________________________________________________________ 5
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
= -40°C to +85°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 4)
PARAMETER CONDITIONS MIN TYP MAX UNITS
BATTERY VOLTAGE
BATT Regulation Voltage
4.1685
4.2315 V
BATT Prequal Voltage Threshold BATT rising 2.8 3.2 V
REF Voltage (Buffered Output)
I
REF
= 0 to 500µA, 4V < V
DC
or V
USB
< 6.5V;
does not affect BATT regulation accuracy
2.94 3.06 V
BATTERY CHARGING AND PRECHARGE CURRENT
DCI Voltage Range 0.1 x V
REF
V
REF
V
V
DCI
= V
REF
930 1070
DCI Voltage to BATT Current
V
DCI
= V
REF
/ 2 490 565
mA
USEL = high 495
USB Charging Current
USEL = low 95
mA
Prequal Charging Current V
BATT
= 2.5V 40 70 mA
BATT Input Current No DC or USB power, V
BATT
= 4.2V 7.5 µA
BATT Shutdown Current EN = GND, USB and/or DC powered 2 µA
THERMISTOR MONITOR AND DIE-TEMPERATURE REGULATION
THRM COLD Trip Level (Note 2) 0.72 0.76 V
REF
THRM HOT Trip Level (Note 2) 0.28 0.30 V
REF
THRM Disable Threshold 50 150 mV
LOGIC INPUT/OUTPUTS AND GATE DRIVERS
DCOK Off-Leakage Current V
DCOK
= 12V, V
DC
= 0V 1 µA
UOK Off-Leakage Current V
UOK
= 6.5V 1 µA
DC input (% of charge current set at DCI) 8 20
CHG Threshold to Indicate Battery Full,
Battery Current Falling (Note 3)
USB input, USEL = 5V
(% of USB charging current)
20 30
%
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 1µA
Note 1: BYP internally connects to the active power input (DCLV or USB). DCLV takes priority if both inputs are powered.
Note 2: These limits guarantee +5°C accuracy with 5% accuracy of thermistor beta (3450 nominal) with 2°C of hysteresis.
Note 3: The CHG output does not go high unless charge current is below the indicated threshold (as set by DCI) and the charger is in
voltage-mode operation. In 100mA USB mode, CHG goes high when the charger transitions from current to voltage mode.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
(18 Seiten)
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