MAX8804WETA+T Maxim Integrated Products, MAX8804WETA+T Datasheet - Page 8

• Manufacturer Part Number: MAX8804WETA+T
• Description: IC DUAL-IN ADPTR CHRGR 8-TDFN-EP
• Manufacturer: Maxim Integrated Products

Specifications of MAX8804WETA+T

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 0 V ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Figure 1. Functional Diagram
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z dual-
input linear battery chargers use voltage, current, and
thermal-control loops to charge and protect a single Li+
battery. When a Li+ battery with a cell voltage below
2.5V is inserted, the MAX8804V/MAX8804W/MAX8804Z
chargers enter the prequalification stage where they
precharge that cell with 95mA (Figure 2). The CHG indi-
cator output is driven low to indicate entry into the pre-
qualification 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 current level is programmed by a simple single-
8
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4.15V TO 30V
4.15V TO 16V
USB
DC
Detailed Description
REF
POK
USB
POK
DC
MAX8804W
MAX8804V
MAX8804Y
MAX8804Z
CIRCUIT
BIAS
DC AND USB OUTPUT CONTROL
CONTROL
LOGIC
GND
VOLTAGE
LOOP
wire 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 indi-
cator goes high impedance, signaling that the battery is
fully charged. The ICs then enter a constant voltage-reg-
ulation mode to maintain the battery at full charge.
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z auto-
matically select between either a USB or AC adapter
input source. The AC adapter charge current is pro-
grammable from 400mA to 700mA in 50mA steps
through a simple single-wire interface (see Tables 2, 3,
and 4). The USB charge current is programmable to
95mA, 380mA, or 475mA through the same interface
(see Tables 5 and 6).
OVERVOLTAGE
PROTECTION
NOTE: ( ) FOR MAX8804V/MAX8804W ONLY
< > FOR MAX8804Y/MAX8804Z ONLY
+105°C
SENSOR
TEMP
(DETBAT)
<USBPWR>
SET
CHG
POK
BAT
Li+