MAX8900A_11 Datasheet, PDF (1/35 Pages) Maxim Integrated Products – 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring

19-5063; Rev 3; 1/11
EVAALVUAAILTAIOBNLEKIT
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
General Description
The MAX8900_ is a high-frequency, switch-mode char-
ger for a 1-cell lithium ion (Li+) or lithium polymer
(Li-Poly) battery. It delivers up to 1.2A of current to the
battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or
3.4V to 8.7V (MAX8900B). The 3.25MHz switch-mode
charger is ideally suited to small portable devices such
as headsets and ultra-portable media players because it
minimizes component size and heat.
Several features make the MAX8900_ perfect for high-
reliability systems. The MAX8900_ is protected against
input voltages as high as +22V and as low as -22V.
Battery protection features include low voltage prequali-
fication, charge fault timer, die temperature monitoring,
and battery temperature monitoring. The battery temper-
ature monitoring adjusts the charge current and termina-
tion voltage as described in the JEITA* specification for
safe use of secondary lithium-ion batteries.
Charge parameters are easily adjustable with external
components. An external resistance adjusts the charge
current from 50mA to 1200mA. Another external resis-
tance adjusts the prequalification and done current
thresholds from 10mA to 200mA. The done current thresh-
old is very accurate achieving Q1mA at the 10mA level.
The charge timer is adjustable with an external capacitor.
The MAX8900_ is available in a 0.4mm pitch, 2.44mm x
2.67mm x 0.64mm WLP package.
Applications
USB Charging
Headsets and Media
Players
Smartphones
Digital Cameras
GPS, PND
eBook
Ordering Information
PART
TEMP PIN-
RANGE PACKAGE
OPTIONS
MAX8900AEWV+T
-40NC to
+85NC
30 WLP
VOVLO = 6.5V
T1 = 0NC
2-pin status indicators
VPQUTH = 2.8V
MAX8900BEWV+T
-40NC to
+85NC
30 WLP
VOVLO = 9.0V
T1 = -15NC
3-pin status indicators
VPQUTH = 2.8V
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
Features
S 3.25MHz Switching Li+/Li-Poly Battery Charger
S JEITA Battery Temperature Monitor Adjusts
Charge Current and Termination Voltage
S 4.2V ±0.5% Battery Regulation Voltage (Alternate
4.1V Target Available on Request)
S Adjustable Done Current Threshold
Adjustable from 10mA to 200mA
±1mA Accuracy at 10mA
S High-Efficiency and Low Heat
S Uses a 2.0mm x 1.6mm Inductor
S Positive and Negative Input Voltage Protection
(±22V)
S Up to +20V Operating Range (Alternate OVLO
Ranges Available on Request)
S Supports No-Battery Operation
S Fault Timer
S Charge Status Outputs
S 2.44mm x 2.67mm x 0.64mm Package
Simplified Applications Circuit
1FH
BST
CS
VIN
(-22V TO +22V) _0.47FF
25V
0603
OFF
ON
LX
BAT
IN
PGND
MAX8900_ ^AVL
STAT1
STAT2
GND
STAT3
CEN
THM
1.0FF
6.3V
0402
PVL
INBP
0.47FF
25V
CT SETI DNI
0603
2.2FF
6.3V
0603
T
SYSTEM
LOAD
Li+/
Li-POLY
*JEITA (Japan Electronics and Information Technology
Industries Association) standard, “A Guide to the Safe Use
of Secondary Lithium Ion Batteries in Notebook-type Personal
Computers” April 20, 2007.
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.