Rainbow Electronics MAX8804Z - Manual (Page 8)

MAX8804Y/MAX8804Z
DC Charging
The MAX8804Y/MAX8804Z are designed to charge a
single-cell Li+ battery from a DC source voltage
between 4.15V and 7V and withstand up to 30V maxi-
mum input voltage. The charge current and top-off
threshold are programmed with the SET input.
USB Charging
The MAX8804Y/MAX8804Z contain a USB input that
allows operation from a USB port with voltages between
4.15V and 7V and can withstand up to 16V maximum
input voltage. Pulsing SET allows programming a 95mA,
380mA, or 475mA maximum charging current when
using the USB input.
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
8 _______________________________________________________________________________________
I CHG < I TOP-OFF
I CHG > I TOP-OFF + 57mA FOR ALL FAST-
CHARGE OPTIONS EXCEPT 95mA
V UVLO < V IN < V OVP
AND V IN > V BAT
V
IN
< V
UVLO
OR V
IN
> V
OVP
OR V BAT > V IN
MAX8804Z
ASYNCHRONOUS
FROM ANYWHERE
t
SET
= HIGH > 2ms
FOR DC MODE
t
SET
= LOW > 2ms
FOR USB MODE
t SET = LOW > 2ms
FOR DC MODE
t
SET = HIGH > 2ms
FOR USB MODE
STANDBY MODE
CHARGER = OFF
POK = LOW
CHG = HIGH IMPEDANCE
MAX8804Y
t
SET
= LOW > 2ms
FOR DC MODE
t
SET = HIGH > 2ms
FOR USB MODE
CV MODE TO CC MODE FOR 95mA
FAST-CHARGE OPTION
ASYNCHRONOUS
FROM ANYWHERE
V
IN < V UVLO
OR V IN > V OVP
OR V BAT > V IN
V
BAT
< 2.2V
MAX8804Z
V BAT > 2.5V
V BAT < 2.5V
FAST-CHARGE
100% CHARGE CURRENT
POK = LOW
CHG = LOW
FULL BAT
V BAT = 4.2V
POK = LOW
CHG = HIGH IMPEDANCE
PREQUALIFICATION
DEFAULT CHARGE CURRENT
POK = LOW
CHG = LOW
SHUTDOWN
CHARGER = OFF
POK = HIGH IMPEDANCE*
CHG = HIGH IMPEDANCE
*POK = LOW WHEN V IN > V OVP
Figure 2. Charger State Diagram