Rainbow Electronics MAX8922L - Manual

General Description
The MAX8922L linear battery charger safely charges a
single-cell lithium-ion (Li+) battery. Charging rate is
optimized to accommodate the thermal characteristics
of a given application. There is no need to reduce the
maximum charge current at the worst-case charger
power dissipation. Charging is optimized for a single
Li+ cell using a control algorithm that includes low-bat-
tery precharging, voltage and current-limited fast
charging, and top-off charging, while continuously
monitoring for input overvoltage and device die-temper-
ature conditions. The fast-charge current and top-off
current thresholds are programmable by a simple
1-Wire
® serial interface. The charger status and valid
input power are indicated by two open-drain outputs
(CHG and POK).
The fast-charge current is defaulted to 400mA and pro-
grammable through the 1-Wire interface (EN/SET). The
MAX8922L also can be programmable to GSM test
mode through the 1-Wire interface.
The MAX8922L is available in a tiny (3mm x 2mm x
0.8mm) 10-pin TDFN package.
Applications
GSM/EDGE/UMTS/CDMA Cell Phones
Digital Cameras
PDAs
Portable Media Players and MP3 Players
Wireless Appliances
Features
♦ Overvoltage-Protected 30V
DC Rated Input (IN)
♦ Input Overvoltage-Protected Safe 4.94V LDO
Output
♦ 2.3A GSM RF Test Mode
♦ No External FET, Blocking Diode, or Sense
Resistor Required
♦ 1-Wire Easy Programmable Fast-Charge and GSM
Test Mode ( EN/SET)
♦ Resistor-Programmable Fast-Charge Current
(SETI)
♦ Resistor-Programmable Top-Off Current
Threshold (MIN)
♦ Prequalification Charge
♦ Power-OK Monitor Output (POK)
♦ Charging-Status Output (CHG)
♦ Die Temperature Regulation for Optimized
Charge Rate
♦ Tiny (3mm x 2mm x 0.8mm) 10-Pin TDFN Package
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
________________________________________________________________ Maxim Integrated Products 1
19-4929; Rev 0; 9/09
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.
Ordering Information
PART PIN-PACKAGE TOP MARK
MAX8922LETB+T 10 TDFN-EP* AWN
+ Denotes a lead(Pb)-free and RoHS-compliant package.
* EP = Exposed pad.
Note: This device operates in the -40°C to +85°C extended
operating temperature range.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
USB/AC ADAPTER
4.45V TO 30V
IN BAT
EN\SET
GND
LDO
SETI
MIN
EP
POK
CHG
SYSTEM SUPPLY
R SETI
R MIN
TEST
MAX8922L
Typical Operating Circuit
10
1
9
2
8
3
7
4
6
5
*EP
*EP = EXPOSED PAD.
BAT CHG TEST
IN
GND LDO
MAX8922L
POK
SETI
EN/SET
MIN
TDFN
(3mm x 2mm x 0.8mm)
TOP VIEW
Pin Configuration