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MAX8814 Evaluation Kit
The second input signal (ABI) is driven by an external
source (Table 2). ABI enables an autoboot signal (ABO
high) when a battery is connected at BATT and is inde-
pendent of POK . If POK is low, the booting assistant
always drives ABO high regardless of ABI. ABI is
Charge-Current Selection
The maximum charging current is programmed by an
external resistor connected from ISET to GND (R ISET ,
R2 in Figure 2). Calculate R ISET as follows:
pulled to GND through an internal 200k Ω resistor. If ABI
is driven externally, an RC filter (R1 and C2 in Figure 2)
is required for ESD protection and noise filtering. To
R ISET =
1596 V
I FAST ? CHARGE
install R1, cut the copper trace across the R1 pads. If
ABI is supplied by a system’s internal GPIO, or logic,
the RC filter is not required.
Table 2. ABO and POK States
where I FAST-CHARGE is in amperes and R ISET is in
ohms. ISET can be used to monitor the charge-current
level. The output current from ISET is 877.2μA per
ampere of charging current. The output voltage at ISET
is proportional to the charging current:
V ISET = CHARGE ISET
ABI
Low
High
X
X
BATT
Present
Present
Not present
Present
POK
High-Z
High-Z
Low
Low
CHARGER STATE
Shutdown
Shutdown
Fast-charge/voltage
regulation
Fast-charge/voltage
regulation
ABO
Low
High
High
High
I × R
1140
The voltage at ISET is nominally 1.4V at the selected
fast-charge current, and falls with charging current as
the cell becomes fully charged or as the thermal-
regulation circuitry activates.
X = Don’t care.
DC Input Sources
The MAX8814 operates from a well-regulated DC source.
The full charging input voltage range is 4.25V to 7V. The
device can withstand up to 28V on the input without dam-
age to the IC. If V IN is greater than 7V, the internal overvolt-
age-protection circuitry disables charging until the input
falls below 7V. An appropriate power supply must provide
at least 4.25V at the desired peak charging current.
IN
GND
ABI
C1
1 μ F
R1
PCB SHORT
C2
1
4
IN
ABI
U1
MAX8814
BATT
8
C3
2.2 μ F
BATT+
BATT-
EN
OPEN
EN
6
JU1
VI/O
ABO
5
ABO
GND
EP
ISET
POK
7
R4
R3
1M Ω
POK
2
3
PCB SHORT
Figure 2. MAX8814 EV Kit Schematic
R2
2.8k Ω
1%
C4
OPEN
ISET
4
_______________________________________________________________________________________
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