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MAX8814 Evaluation Kit
-
POWER SUPPLY (PS1)
4.25V TO 28V
+
GND
IN
BATT-
BATT+
Li+
-
+
DMM1
+
-
MAX8814
EVALUATION KIT+
POK
10A AMMETER
+
DMM4
+
ISET
VI/O
-
DMM2
-
JU1
+
POWER SUPPLY (PS2)
READ PROCEDURE FOR DETAILS
Figure 1. Test Procedure Setup for MAX8814 EV Kit
+
-
DMM3
SHUNT INSTALLED = IC DISABLED
SHUNT NOT INSTALLED = IC ENABLED
-
1.3V TO 5V
Detailed Description
The MAX8814 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and pro-
tect the battery (Figure 1). When an Li+ battery with a
cell voltage below 2.5V is inserted, the MAX8814
charger enters the prequalification stage where it
precharges that cell with 10% of the user-programmed
fast-charge current. When battery voltage reaches
2.5V, the charger soft-starts as it enters the fast-charge
stage. In the MAX8814, the fast-charge current level is
programmed through a resistor from ISET to GND. As
the battery voltage approaches 4.2V, the charging cur-
rent is reduced. Once the battery voltage reaches 4.2V,
the IC then enters a constant voltage regulation mode
to maintain the battery at full charge.
Thermal Regulation
The thermal-regulation loop limits the MAX8814 die
temperature to +115°C by reducing the charge current
as necessary. This feature not only protects the IC from
overheating, but also allows a higher charge current
without risking damage to the IC.
Charger Enable Input
The MAX8814 contains an active-low logic input ( EN )
used to enable the charger. Drive EN low, leave uncon-
nected, or connect to GND to enable the charge-control
circuitry. Drive EN high to disable the charge-control
circuitry. EN has an internal 200k Ω pulldown resistor.
POK Output
The open-drain POK output asserts low when V IN ≥
4.25V and (V IN - V BATT ) ≥ 40mV (typ V IN rising). POK
requires an external pullup resistor (1M Ω typ) to an
external power supply (R3 in Figure 2). POK is high
impedance when V BATT ≥ (V IN - 40mV).
Autobooting Assistant
The MAX8814 contains an autobooting assistant circuit
that generates an enable signal for system booting
(ABO). The booting assistant functions as an internal
“OR” gate (refer to Figure 1 in the MAX8814 IC data
sheet for details). The first input is dependent on the
state of the internal POK signal and the second input is
an external signal applied to ABI.
_______________________________________________________________________________________
3
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