Datasheet
4 Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
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 PGND .............................................................-22V to +22V
INBP to PGND .......................................... (V
BAT
- 0.3V) to +22V
IN to INBP ..............................................................-30V to +1.2V
STAT1, STAT2 to GND ..........................................-0.3V to +30V
BST to PGND .........................................................-0.3V to +36V
BST to LX ..............................................................-0.3V to +6.0V
BST to PVL ............................................................-0.3V to +30V
PVL, BAT, CS to PGND ........................................-0.3V to +6.0V
AVL, STAT3, CEN, THM to GND .......................... -0.3V to +6.0V
PVL to AVL ...........................................................-0.3V to +0.3V
CT to GND .................................................-0.3V to (AVL + 0.3V)
SETI, DNI to GND .................................... -0.3V to (V
BAT
+ 0.3V)
PGND to GND ......................................................-0.3V to +0.3V
IN Continuous Current ...................................................2.4A
RMS
LX Continuous Current (Note 1) ....................................1.6A
RMS
CS Continuous Current ................................................ 1.3A
RMS
BAT Continuous Current ...............................................1.3A
RMS
Continuous Power Dissipation (T
A
= +70NC)
30-Bump WLP (derate 20.4mW/NC above +70NC) ....1616mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature ...................................... -40NC to +150NC
Storage Temperature Range ............................ -65NC to +150NC
Soldering Temperture (reflow) ........................................+260NC
ELECTRICAL CHARACTERISTICS
(V
IN
= 6V, V
BAT
= 4V, R
SETI
= 2.87kI, R
DNI
= 3.57kI, V
THM
= V
AVL/2
, circuit of Figure 1, T
A
= -40NC to +85NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
ABSOLUTE MAXIMUM RATINGS
Note 1: LX has an internal clamp diode to PGND and INBP. Applications that forward bias these diodes should take care not to
exceed the power dissipation limits of the device.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
IN Input Voltage Range (Note 3) V
IN
Withstand voltage -20 +20 V
Operating voltage
MAX8900B 3.4 8.7
V
MAX8900A/
MAX8900C
3.4 6.3
IN Undervoltage Threshold V
UVLO
V
IN
falling, 400mV hysteresis (Note 4) 3.1 3.2 3.3 V
IN to BAT Shutdown Threshold V
IN2BAT
When charging stops, V
IN
falling, 200mV
hysteresis
0 15 30 mV
IN Overvoltage Threshold
(Note 3)
V
OVLO
V
IN
rising
0.40V hysteresis (MAX8900B) 8.80 9.00 9.20
V
0.26V hysteresis (MAX8900A/
MAX8900C)
6.35 6.50 6.65
IN Supply Current I
IN
Charger enabled, no switching 1 2
mACharger enabled, f = 3.25MHz, V
IN
= 6V 20
Charger disabled, CEN = high
0.04 0.2
LX High-Side Resistance R
HS
0.10
I
LX Low-Side Resistance R
LS
0.15
I
LX Leakage Current LX = GND or IN
T
A
= +25NC
0.01 10
FA
T
A
= +85NC
0.1
BST Leakage Current V
BST
- V
LX
= 6V
T
A
= +25NC
0.01 10
FA
T
A
= +85NC
0.1
Current-Sense Resistor R
SNS
V
BAT
= 2.6V 0.045
I
IN to BAT Dropout Resistance R
IN2BAT
Calculation estimates a 40mI inductor
resistance (R
L
), R
IN2BAT
= R
IN2INBP
+ R
HS
+ R
L
+ R
SNS
0.3
I
Switching Frequency f
SW
V
BAT
= 2.6V 3.25 MHz