MAX8804Y Maxim Integrated Products, MAX8804Y Datasheet - Page 8

• Manufacturer Part Number: MAX8804Y
• Description: USB/AC Adapter Chargers
• Manufacturer: Maxim Integrated Products

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High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Figure 1. Functional Diagram
The MAX8804W/MAX8804Y/MAX8804Z dual-input linear
battery chargers use voltage, current, and thermal-con-
trol loops to charge and protect a single Li+ battery.
When a Li+ battery with a cell voltage below 2.5V is
inserted, the MAX8804W/MAX8804Z chargers enter the
prequalification stage where they precharge that cell
with 95mA (Figure 2). The CHG indicator output is dri-
ven low to indicate entry into the prequalification state.
When battery voltage exceeds 2.5V, the charger soft-
starts as it enters the fast-charge stage. The MAX8804Y
eliminates the prequalification state and enters fast-
charge when the battery is inserted. The fast-charge cur-
rent level is programmed by a simple single-wire
8
_______________________________________________________________________________________
4.15V TO 30V
4.15V TO 16V
USB
DC
Detailed Description
REF
POK
USB
POK
DC
MAX8804Y
MAX8804Z
CIRCUIT
BIAS
DC AND USB OUTPUT CONTROL
CONTROL
LOGIC
GND
VOLTAGE
LOOP
interface. As the battery voltage approaches 4.2V, the
charging current is reduced. If the battery current drops
below the top-off current threshold, the CHG indicator
goes high impedance, signaling that the battery is fully
charged. The ICs then enter a constant voltage-regula-
tion mode to maintain the battery at full charge.
The MAX8804W/MAX8804Y/MAX8804Z automatically
select between either a USB or AC adapter input source.
The AC adapter charge current is programmable from
400mA to 700mA in 50mA steps through a simple single-
wire interface (see Tables 2 and 3). The USB charge cur-
rent is programmable to 95mA, 380mA, or 475mA
through the same interface (see Tables 4 and 5).
OVERVOLTAGE
PROTECTION
NOTE: ( ) FOR MAX8804W ONLY
< > FOR MAX8804Y/MAX8804Z ONLY
+105°C
SENSOR
TEMP
(DETBAT)
<USBPWR>
SET
CHG
POK
BAT
Li+