Datasheet

MAX8814
28V Linear Li+ Battery Charger with
Smart Autoboot Assistant
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL 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.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND ...............................................................-0.3V to +30V
ABI, BATT, EN, POK to GND....................................-0.3V to +6V
ABO to GND............................................-0.3V to (V
BATT
+ 0.3V)
ISET to GND .............................................................-0.3V to +4V
IN to BATT Continuous Current .........................................1A
RMS
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN (derate 11.9mW/°C above +70°C)
(multilayer PCB) ........................................................953.5mW
BATT Short-Circuit Duration .......................................Continuous
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 028V
Input Operating Voltage Range 4.25 6.80 V
V
IN
rising 40
Power-OK Threshold
V
IN
- V
BATT
,
10mV hysteresis (typ)
V
IN
falling 30
mV
Overvoltage-Lockout Trip
Threshold
V
IN
rising, 100mV hysteresis (typ) 6.8 7 7.5 V
Constant-current charging mode (I
BATT
= 0A) 0.8 1.35
IC disabled (V
EN
= 5V) 0.23 0.50
T
A
= +25°C 0.021 0.065
IN Input Current
V
IN
= 4V,
V
BATT
= 4.2V
T
A
= +85°C 0.021
mA
V
IN
= 0 to 4V,
V
BATT
= 4.2V
110
BATT Input Current
IC disabled 3
µA
T
A
= 0°C to +85°C 4.179 4.200 4.221
Battery Regulation Voltage I
BATT
= 0A
T
A
= -40°C to +85°C 4.158 4.200 4.242
V
Minimum BATT Bypass
Capacitance
2.2 µF
T
A
= 0°C to +85°C 524 570 616
V
BATT
= 3.5V
T
A
= -40°C to +85°C 485 570 656
T
A
= 0°C to +85°C 89 107 125
Fast-Charge Current
V
BATT
= 3.5V,
R
ISET
= 14kΩ
T
A
= -40°C to +85°C 80 107 134
mA
Prequalification Charge Current
Percentage of the fast-charge current, V
BATT
= 2.2V,
T
A
= 0°C to +85°C
41015%
Die Temperature Regulation
Threshold
+115 °C
V
BATT
Prequalification Threshold
Voltage
V
BATT
rising, 100mV hysteresis (typ) 2.3 2.5 2.7 V
Current-Sense Amplifier Gain
(I
BATT
to I
ISET
)
I
BATT
= 570mA 877.2 µA/A