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SMB239 Fiches technique(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMB239 Fiches technique(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 30 page SMB239 Summit Microelectronics, Inc 2129 3.0 2/23/2009 2 GENERAL DESCRIPTION The SMB239 is a fully programmable, linear battery charger for single-cell Li-Ion and Li-Polymer battery packs. The device’s simple, linear-mode operation and ultra-small package significantly reduce component count and required board space. The SMB239 provides four main charging phases: trickle-charge, pre- conditioning (pre-charge), constant current and constant voltage. The overall system accuracy of the SMB239 is 1%, allowing for a higher capacity utilization versus other conventional solutions. When a battery or an external supply is inserted the SMB239 performs the pre-qualification checks before initiating a charging cycle. The input voltage needs to be higher than the UVLO threshold for the charging cycle to start. As soon as the input supply is removed, the SMB239 enters a shutdown mode, thereby saving battery power. A programmable option also exists that allows the user to prevent battery charging until an I 2C command has been issued. If the battery voltage is below 2.0V (trickle-charge to pre- charge threshold), the device will apply a trickle-charge current of 10mA (typical). This allows the SMB239 to reset the protection circuit in the battery pack and bring the battery voltage to a higher level without compromising safety. Once the battery voltage crosses the 2.0V threshold, the SMB239 enters the pre-charge mode. This mode replenishes deeply depleted cells and minimizes heat dissipation during the initial charge cycle. The preconditioning current is programmable, with the default value at C/10. If the battery voltage does not reach the preconditioning voltage level (programmable) within a specified amount of time (pre-charge timeout), the safety timer expires and the charge cycle is terminated. When the battery voltage reaches the pre-charge to fast- charge voltage level, the SMB239 enters the constant current (fast charge) mode. The fast charge current level is programmable via the corresponding register. Once the final float voltage (programmable) has been reached, the battery charger will enter a constant voltage mode in which the battery voltage is kept constant, allowing the charge current to gradually taper off. The constant-voltage charging mode will continue until the charge current drops below the termination current threshold, or until the fast charge timer has expires. The termination current threshold is programmable. After the charge cycle has terminated, the SMB239 continues to monitor the battery voltage. If the battery voltage falls below the recharge threshold (typically 115mV below float voltage), the SMB239 can automatically top-off the battery. An option exists for preventing charging initiation upon power cycling unless the battery voltage is 220mV, 390mV or 550mV (VCH) below the float voltage level. This prevents over-stressing of the battery via continuous charging cycles in systems with short run times and frequent power cycling (IN power connect/disconnect). A wide range of protection features is also included in the SMB239. These include input and output (battery) over-voltage protection, battery missing detector and thermal monitor for continuous cell temperature monitoring and pre-qualification. The following charging parameters can be adjusted dynamically via the I2C interface, for optimizing battery management real-time. These parameters can also be programmed statically via a user-friendly GUI interface: • Battery (float) voltage • Fast charge current • Pre-conditioning voltage threshold • Pre-conditioning charge current • Termination current • Temperature window • Safety charge timers. |
Numéro de pièce similaire - SMB239 |
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Description similaire - SMB239 |
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