MAX8844Z/MAX8844Y
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V or V
USB
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = unconnected, R
SETI
= 2.8kΩ to GND, V
DETBAT
= 0V, C
BATT
=
2.2µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
ABI Logic Input Low Threshold V
BATT
= 4V, V
IN
= 0V 0.4 V
ABI Logic Input High Threshold V
BATT
= 4V, V
IN
= 0V 1.3 V
ABO Output Low Threshold I
ABO(SINK)
= 1mA 0.4 V
ABO Output High Threshold I
ABO(SOURCE)
= 1mA
V
BATT
-
0.4V
V
ABO Output Low Threshold Open drain, I
ABO(SINK)
= 1mA 0.4
ABO Output High Threshold Open drain, 100kΩ pullup on BATT
V
BATT
-
0.4V
THERMAL
Die Temperature Regulation
Threshold
115 °C
Note 1: Specifications are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 2: The IN input supply and USB input supply are interchangeable (V
IN
= V
USB
). See the
DC and USB Power Supplies
section
for further details.
Note 3: See the
Top-Off Current Threshold Setting
section for further details.
0
0.3
0.2
0.1
0.5
0.4
0.9
0.8
0.7
0.6
1.0
0 4 8 12 16 20 24 28
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8844 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
V
EN
= 0V,
I
BATT
= 0A,
V
IN
RISING
0
0.2
0.1
0.4
0.3
0.5
0.6
012164 8 20 24 28
DISABLED MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8844 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
V
EN
= 5V
0
200
100
500
400
300
700
600
800
0 1.5 2.00.5 1.0 2.5 3.0 3.5 4.0 4.5
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX8844 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
V
IN
= 5V,
V
USB
= 0V
V
IN
= 0V,
V
USB
= 5V
Typical Operating Characteristics
(V
IN
= 5V or V
USB
= 5V, V
BATT
= 4V, R
POK
= R
CHG
= 200kΩ to 5V, EN = unconnected, R
SETI
= 2.8kΩ to GND, R
MIN
= 1.74kΩ to
GND, R
DETBAT
= 4.7kΩ to GND, C
BATT
= 2.2µF, T
A
= +25°C, unless otherwise noted.
