MAX8922L – Li+ Linear Battery Charger with GSM Test Mode
MAX8922L – 30V Li+ Linear Battery Charger with GSM Test Mode in 3mm x 2mm TDFN
Industry’s First 2.3A GSM Test Mode Supporting Li+ Linear Charger with Safe LDO Output
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-battery precharging, voltage and current-limited fast charging, and top-off charging, while continuously monitoring for input overvoltage and device die-temperature 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 (active-low CHG and active-low POK).
The fast-charge current is defaulted to 400mA and programmable through the 1-Wire interface (active-low 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.
Key Features:
- Overvoltage-Protected 30VDC 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 (Active-Low EN/SET)
- Resistor-Programmable Fast-Charge Current (SETI)
- Resistor-Programmable Top-Off Current Threshold (MIN)
- Prequalification Charge
- Power-OK Monitor Output (Active-Low POK)
- Charging-Status Output (Active-Low CHG)
- Die Temperature Regulation for Optimized Charge Rate
- Tiny (3mm x 2mm x 0.8mm) 10-Pin TDFN Package
Applications/Uses:
- Digital Cameras
- GSM/EDGE/UMTS/CDMA Cell Phones
- PDAs
- Portable Media Players and MP3 Players
- Wireless Appliances
Diagram:
Source: MAXIM
Press Release:
Li+ battery charger has GSM test mode in a 6mm² TDFN
The MAX8922L 30V battery charger offers a GSM test mode to facilitate production-line testing and calibration of cell phones with Micro-USB connectors.
SUNNYVALE, CA—Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX8922L, a 30V, single-input lithium-ion (Li+) charger with a 2.3A GSM test mode. The inclusion of a GSM test mode facilitates production-line calibration and testing of devices with a Micro-USB connector. Using this charger, designers can quickly calibrate their GSM phones without having to install a battery. The MAX8922L is well suited for GSM, EDGE, UMTS, and CDMA cell phones.
The MAX8922L’s input is overvoltage protected to 30V, eliminating the need for an external overvoltage-protection IC. The device includes a 4.94V LDO output to safely power the low-voltage VBUS input. The fast-charge current and top-off current thresholds can be configured using an external resistor for design flexibility. The MAX8922L also allows the fast-charge current and GSM test mode to be programmed through a single-wire interface. The charger status and valid input power are indicated by two open-drain outputs.
The MAX8922L is packaged in a 3mm x 2mm, 10-pin TDFN package. Prices start at $1.60 (1000-up, FOB USA).
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers’ products. To date, it has developed over 6300 products serving the industrial, communications, consumer, and computing markets.
Maxim reported revenue in excess of $1.6 billion for fiscal 2009. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to www.maxim-ic.com.
