MAX8922L Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 30V Li+ Linear Battery Charger with GSM Test Mode in 3mm x 2mm TDFN

19-4929; Rev 1; 4/10
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
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
single-pin 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 single-pin interface (EN/SET).
The MAX8922L also can be programmable to GSM test
mode through the single-pin 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
o Overvoltage-Protected 30V_DC Rated Input (IN)
o Input Overvoltage-Protected Safe 4.94V LDO
Output
o 2.3A GSM RF Test Mode
o No External FET, Blocking Diode, or Sense
Resistor Required
o Single-Pin Easy Programmable Fast-Charge and
GSM Test Mode (EN/SET)
o Resistor-Programmable Fast-Charge Current
(SETI)
o Resistor-Programmable Top-Off Current
Threshold (MIN)
o Prequalification Charge
o Power-OK Monitor Output (POK)
o Charging-Status Output (CHG)
o Die Temperature Regulation for Optimized
Charge Rate
o Tiny (3mm x 2mm x 0.8mm) 10-Pin TDFN Package
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.
Pin Configuration
Typical Operating Circuit
TOP VIEW
10 9 8 7 6
MAX8922L
*EP
123 45
*EP = EXPOSED PAD.
TDFN
(3mm x 2mm x 0.8mm)
USB/AC ADAPTER
IN
4.45V TO 30V
BAT
SETI
LDO
RSETI
MAX8922L
MIN
SYSTEM SUPPLY
RMIN
EN\SET
EP
CHG
GND TEST ^POK
________________________________________________________________ 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.