MAX8845ZETC+ Maxim Integrated Products, MAX8845ZETC+ Datasheet - Page 6

• Manufacturer Part Number: MAX8845ZETC+
• Description: IC BATT CHRGR LI+ 28V 12TQFN-EP
• Manufacturer: Maxim Integrated Products

Specifications of MAX8845ZETC+

• 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: 12-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
6
MAX8845Z
_______________________________________________________________________________________
—
10
11
12
—
1
2
3
4
5
6
7
8
9
PIN
MAX8845Y/
MAX8845X/
MAX8845W
10
11
12
—
—
1
2
3
4
5
6
7
8
9
SAFEOUT
DETBAT
NAME
BATT
GND
CHG
SETI
POK
ABO
ABO
MIN
ABI
EN
EP
IN
( m A) .
Charge-Current Program and Fast-Charge Current Monitor. Output current from SETI is
1016µA per ampere of battery charging current. Set the charging current by connecting
a resistor (R
configure the MAX8845Z/MAX8845Y/MAX8845X/MAX8845W as a USB charger, see
Figure 5.
Battery Pack ID Resistor Detection Input. If DETBAT is pulled low through a pulldown
resistor less than 51kΩ the charger is enabled. If DETBAT is left unconnected, the
charger is disabled.
Autobooting External Input. See the Autobooting Assistant section and Table 1 for
autobooting conditions. ABI is pulled to GND through an internal 200kΩ resistor.
Active-Low, Logic-Level Enable Input. Drive EN high to disable charger. Drive EN low or
leave unconnected for normal operation. EN has an internal 200kΩ pulldown resistor.
Ground. Connect GND and the exposed pad to a large copper ground plane for
maximum power dissipation. Connect GND to the exposed pad directly under the IC.
Active-Low, Input Voltage Status Indicator. POK is an open-drain output that asserts low
when 2.35V < V
+7.5V (+8.0V for MAX8845X only) or V
high impedance. Connect a pullup resistor to the microprocessor’s I/O voltage when
interfacing with a microprocessor logic input.
Active-High, Autobooting Logic Output. See the Autobooting Assistant section and Table
1 for autobooting conditions.
Active-Low, Open-Drain Logic Output. See the Autobooting Assistant section and Table
1 for autobooting conditions.
Li+ Battery Connection. Bypass BATT to GND with a 2.2µF ceramic capacitor.
Top - O ff C ur r ent Thr eshol d P r og r am m ab l e Inp ut. I
Active-Low, Charging Indicator. CHG is an open-drain output that is pulled low once
charging begins. CHG is high impedance when the battery current drops below MIN, or
when the IC is disabled. Connect a pullup resistor to the microprocessor’s I/O voltage
when interfacing with a microprocessor logic input.
Input Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to
improve line noise and input transient rejection.
4.7V (MAX8845Z/MAX8845Y/MAX8845W) or 4.85V (MAX8845X) Regulated LDO Output
with Input Overvoltage Protection. Bypass SAFEOUT to GND with a 1µF or larger
ceramic capacitor. SAFEOUT can be used to supply low voltage-rated USB systems.
Exposed Pad. Connect the exposed pad to a large ground plane for maximum power
dissipation. Connect GND to the exposed pad directly under the IC.
SETI
IN
in Figure 3) from SETI to GND. I
< 7V (7.5V for MAX8845X only) and (V
BATT
FUNCTION
> V
IN
M IN
FAST-CHARGE
the IC is shut down and POK becomes
( m A) fal l i ng = 148V /R
IN
- V
BATT
Pin Description
= 1400V/R
) > 40mV. If V
M IN
SETI
( kΩ ) + 22
. To
IN
>