Datasheet

MAX8814
28V Linear Li+ Battery Charger with
Smart Autoboot Assistant
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulator Dropout Voltage
(V
IN
- V
BATT
)
V
BATT
= 4.1V, I
BATT
= 425mA 240 500 mV
EN Logic-Input Low Voltage 4.25V < V
IN
< 6.5V 0.4 V
EN Logic-Input High Voltage 4.25V < V
IN
< 6.5V 1.3 V
EN and ABI Internal Pulldown
Resistance
100 200 400 kΩ
ABI Logic-Input Low Voltage V
IN
= 0V 0.4 V
ABI Logic-Input High Voltage V
IN
= 0V 1.3 V
ABO Output Low Voltage I
ABO (SINK)
= 1mA 0.4 V
ABO Output High Voltage I
ABO (SOURCE)
= 1mA
V
BATT
-
0.4V
V
POK Output Low Voltage I
POK
= 5mA 0.4 V
T
A
= +25°C 0.001 1
POK Output High Leakage
Current
V
POK
= 5.5V
T
A
= +85°C 0.002
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = 0V, R
ISET
= 2.8kΩ to GND, C
BATT
= 2.2µF, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: Specifications are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Typical Operating Characteristics
(V
IN
= 5V, V
BATT
= 4V, R
POK
= 1MΩ to BATT, EN = 0V, R
ISET
= 2.8kΩ to GND, C
BATT
= 2.2µF, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +25°C.)
0
0.3
0.2
0.1
0.5
0.4
0.9
0.8
0.7
0.6
1.0
0 4 8 1216202428
SUPPLY CURRENT
vs. VOLTAGE
MAX8814 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
EN = 0V
0
100
200
300
400
500
600
700
800
0105 15202530
DISABLED MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8814 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
V
EN
= 5V
0
200
100
400
300
600
500
700
900
800
1000
0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.0 4.5
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX8814 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)