The SMB349 is a programmable single-cell lithium-ion/lithium-polymer battery charger designed for a variety of portable applications. The device provides a simple and efficient way to charge high-capacity Li- Ion batteries and power the system via a USB/AC adapter input.
Unlike conventional charging devices, the SMB349’s high-efficiency switch- mode operation eliminates the low charge current and thermal problems of conventional solutions. In addition, the switching architecture in conjunction with programmability enables dramatically faster charging from current limited inputs such as USB.
Charge current and input current limits can be set up to 4A and 3.5A respectively. Also the SMB349 can manage two outputs independently: battery charging and system power. This allows immediate system operation even under missing/deeply discharged battery conditions.
Efficient battery charging eliminates heat issues
o 90% conversion efficiency
Charge current: up to 4A
OptiCharge™ Automatic Input Current Limit for universal
USB/AC/DC adapter compatibility*
TurboCharge+™ Automatic Float Voltage Compensation (AFVC) *
FlexCharge™ Automatic Power Source Detection per latest
USB charging specification 1.2
Programmable input current limiting (USB 2.0/3.0 compliant)
Up to 750mA charging output from 500mA USB port or 4000mA
from AC adapter using proprietary “TurboCharge™ Mode”
50mA SYSON Auxillary output allows system operation with
deeply discharged/missing battery – no start-up delay
Output CurrentPath™ control allows system operation with
deeply discharged/missing battery – no start-up delay
USB On-the-Go (OTG) power support (up to 900mA @ +5V)
HW-based, programmable JEITA and JISC 8714 support
Switching frequency: 750KHz, 1MHz, 1.5MHz, 3MHz
+4.35 to +16V operating input voltage range
+20V input rating (non-operating) with over-voltage protection
Digital programming of all major parameters via I2C interface
