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SMB135 Datasheet(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMB135 Datasheet(HTML) 2 Page - Summit Microelectronics, Inc. |
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2 / 34 page  SMB135 Summit Microelectronics, Inc 2106 3.1 11/4/2008 2 GENERAL DESCRIPTION The SMB135 is a fully programmable battery charger for single-cell Li-Ion and Li-Polymer battery packs. The device’s high-efficiency, switch-mode operation reduces heat dissipation and allows for higher current capability for a given package size. The SMB135 provides four main charging phases: trickle-charge, pre-conditioning (pre-charge), constant current and constant voltage. The overall system accuracy of the SMB135 is 1%, allowing for a higher capacity utilization versus other conventional solutions. When a battery or an external supply is inserted and the EN (ENABLE) input is asserted, the SMB135 performs the pre-qualification checks before initiating a charging cycle. The input voltage needs to be higher than the UVLO threshold and the cell temperature needs to be within the temperature limits for the charging cycle to start. As soon as the input supply is removed, the SMB135 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 SMB135 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 SMB135 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 SMB135 enters the constant current (fast charge) mode. The fast charge current level is programmable in two ways: a) via an external sense resistor and b) 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 from 25mA to 130mA in 15mA increments. After the charge cycle has terminated, the SMB135 continues to monitor the battery voltage. If the battery voltage falls below the recharge threshold (typically 115mV below float voltage), the SMB135 can automatically top-off the battery. A wide range of protection features is also included in the SMB135. These include input and output 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 • Safety charge timers • Temperature window The SMB135 also offers three programmable PWM switching frequencies ranging from 750kHz to 1250kHz in 250kHz increments. |
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Similar Description - SMB135_08 |
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