Datasheet

4
Maxim Integrated
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
ELECTRICAL CHARACTERISTICS (continued)
(V
DC
= V
PEN1
= V
PEN2
= 5V, CEN = USUS = THMEN = GND, V
BATT
= 4V, V
THM
= 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, C
CT
= 0.068FF, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
BATT Recharge Threshold—
Safety Region 2
Change in V
BATT
from DONE to fast-
charge restart
V
THM_T2
< V
THM
< V
THM_T3
-145 -104 -65
mV
V
THM_T1
< V
THM
< V
THM_T2
or
V
THM_T3
< V
THM
< V
THM_T4
-120 -80 -40
BATT Fast-Charge
Current Range
R
ISET
= 10kI to 2kI
0.3 1.5 A
BATT Charge Current Accuracy
V
SYS
= 5.5V,
V
THM_T1
< V
THM
< V
THM_T4
(safety
region 2)
R
ISET
= 2kI
1350 1500 1650
mA
R
ISET
= 4kI
675 750 825
R
ISET
= 10kI
270 300 330
R
ISET
= 2kI, V
BATT
= 2.5V
(prequal)
270 300 330
R
ISET
= 4kI, V
BATT
= 2.5V
(prequal)
130 150 170
R
ISET
= 10kI, V
BATT
= 2.5V
(prequal)
60
ISET Output Voltage
R
ISET
= 4kI, I
BATT
= 500mA (V
ISET
= 1.5V at full
charge current) V
THM_T1
< V
THM
< V
THM_T4
0.9 1 1.1 V
Charger Soft-Start Time Charge-current ramp time 1.5 ms
BATT Prequal Threshold V
BATT
rising, 180mV hysteresis 2.9 3 3.1 V
BATT Input Current
V
BATT
= 4.2V,
I
LDO
= 0
No DC or USB power
connected, THMEN = low,
V
CEN
= 5V
5 12
FA
No DC or USB power
connected, THMEN = high,
V
CEN
= 5V
12 25
DC or USB power connected,
V
CEN
= 5V
0.003 2
DONE Threshold as a
Percentage of Fast-Charge
Current
I
BATT
decreasing 20 %
Maximum Prequal Time
From CEN falling to end of prequal charge, V
BATT
= 2.5V
180 min
Maximum Fast-Charge Time
From CEN falling to FLT falling
300 min
Maximum Top-Off Time 15 s
Timer Accuracy -20 +20 %
Timer Extend Threshold
Percentage of fast-charge current below where the timer
clock operates at half-speed
50 %
Timer Suspend Threshold
Percentage of fast-charge current below where timer
clock pauses
20 %