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ACT2813 Datasheet(PDF) 9 Page - Active-Semi, Inc |
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ACT2813 Datasheet(HTML) 9 Page - Active-Semi, Inc |
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9 / 23 page  Rev 2, 19-May-15 Innovative PowerTM - 9 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C FUNCTIONAL DESCRIPTION ACT2813/ACT2813C is a complete battery charging and discharging power management solution for applications of single-cell lithium-based backup battery pack or power bank. There is a power path from input to output. If output voltage drops below 4.25V, the input switch Q1 turns off and restart in 2 seconds. With the advanced ACT2813/ACT2813C architecture, a synchronous buck/boost converter is connected from VOUT to switching node (SW). With the bidirectional architecture, the converter could be configured as either buck to charge battery or boost to discharge battery. With switching charger and discharger, the higher charge current and higher conversion efficiency are achieved. Modes of Operation ACT2813/ACT2813C has 3 operation modes: charge mode, boost mode and high-impedance (HZ) mode. In charge mode, the input current limit Q1 is enabled and Q2 and Q3 operate as a buck converter to charge battery. In boost mode, Q2 and Q3 operate as boost converter to step battery voltage up to +5V at VOUT, and the current limit switch Q1 is turned off, and the reverse current from VOUT to VIN is blocked. In HZ mode, all the switches are turned off and the drainage current from battery is very low. ACT2813 system operation flow chart as shown in Figure 1 and ACT2813C system operation flow chart as shown in Figure 2. Any transitions between boost mode and charge mode go through HZ mode by turning off all the switches Q1-Q3 into HZ mode for 2 seconds before enabling the other mode. The modes are determined by HZ pin and VIN pin as shown in the table 1. A valid VIN voltage forces ACT2813/ACT2813C into charge mode. Boost mode is enabled if HZ pin is pulled low and VIN is invalid or not present. When HZ=0, if PB is pulled low for more than 30ms, boost converter is enabled. For ACT2813, a running boost is disabled if one of the following conditions is met: 1. Boost converter output current is below light load threshold for 16 seconds. 2. Battery voltage falls below the boost cut-off threshold. 3. After PB is released, if PB is pulled low for more than 1.5 seconds. Flashlight ACT2813C has an flashlight function. Once PB is pressed for more than 3 seconds, the flashlight is switched on. The driver will deliver up to 50mA current to the flashlight. During flashlight on, if PB is pressed for 3 seconds, flashlight will be switched off. Table 1: Mode Selection HZ PIN 0 0 1 1 VIN Valid 0 1 0 1 Mode Boost Charge HZ Charge Figure 1: ACT2813 System Operation Flow Chart |
Similar Part No. - ACT2813_15 |
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Similar Description - ACT2813_15 |
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