MAX8845Z Maxim Integrated Products, MAX8845Z Datasheet - Page 2

• Manufacturer Part Number: MAX8845Z
• Description: 28V Linear Li+ Battery Chargers
• Manufacturer: Maxim Integrated Products

www.datasheet4u.com
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +30V
ABI, BATT, EN, POK, ABO, ABO, CHG, DETBAT, SETI, MIN,
IN to BATT Continuous Current .........................................1A
Continuous Power Dissipation (T
ELECTRICAL CHARACTERISTICS
(V
+85°C, unless otherwise noted. Typical values are at T
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.
2
Input Supply Voltage Range
Input Supply Operating Voltage Range
Overvoltage Lockout Trip Threshold
Input Current
BATT, CHG, POK
Minimum BATT Bypass Capacitance
V
Battery Regulation Voltage
Regulator Dropout Voltage (V
BATT Input Current
Current-Sense Amplifier Gain (I
Fast-Charge Current
CHG Top-Off Threshold
CHG Hysteresis
CHG Detection Delay
IN
SAFEOUT to GND ................................................-0.3V to +6V
12-Thin QFN (derate 14.7mW/°C above +70°C)
(multilayer PCB) ......................................................1176.5mW
BATT
_______________________________________________________________________________________
= 5V, V
Prequalification Threshold Voltage
BATT
= 4V, R
PARAMETER
POK
= 1MΩ to BATT, EN = unconnected, R
IN
BATT
A
- V
= +70°C)
BATT
to I
)
SETI
)
V
Constant current charging
I
Constant current charging
I
IC disabled, V
V
V
V
I
V
V
V
IC disabled
I
V
R
V
R
I
R
I
R
I
IN
IN
BATT
BATT
BATT
BATT
BATT
IN
IN
BATT
BATT
BATT
IN
BATT
BATT
BATT
SETI
SETI
MIN
MIN
- I
- I
rising, 100mV hysteresis (typ)
= 4V,
= 0 to 4V,
A
BATT
BATT,
= 1.75kΩ
= 1.75kΩ
= 0
= 500mA
= 2.8kΩ
= 14kΩ
falling, battery is charged
rising after top-off is detected,
falls below top-off threshold
= +25°C.) (Note 1)
= 3.5V,
= 3.5V,
= 4.2V
rising, 100mV hysteresis (typ)
= 4.1V, I
= 4.2V
RMS
, I
I
BATT
BATT
EN
CONDITIONS
BATT
= 0
= 500mA
= 5V
SETI
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
= 425mA
T
T
T
T
T
T
= 2.8kΩ to GND, V
A
A
A
A
A
A
= -40°C to +85°C
= 0°C to +85°C
= +25°C
= +85°C
= -40°C to +85°C
= 0°C to +85°C
DETBAT
4.175
4.158
MIN
4.25
460
425
7.0
2.3
4.0
85
0
= 0, C
BATT
4.200
4.200
1016
TYP
0.22
0.20
0.02
0.03
260
500
500
100
106
7.5
2.2
2.5
6.2
38
1
5
3
= 2.2µF, T
4.225
4.242
MAX
7.00
0.50
0.50
10.7
540
575
115
8.0
2.7
28
10
A
= -40°C to
UNITS
µA/A
mA
mV
mA
mA
mA
ms
µF
µA
V
V
V
V
V