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ACT2801_14 参数 Datasheet PDF下载

ACT2801_14图片预览
型号: ACT2801_14
PDF下载: 下载PDF文件 查看货源
内容描述: [5V/1.5A Backup Battery Pack Manager]
分类和应用: 电池
文件页数/大小: 23 页 / 614 K
品牌: ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
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ACT2801/ACT2801C  
Rev 2, 15-Apr-14  
FUNCTIONAL DESCRIPTION  
ACT2801/ACT2801C is  
a
complete battery  
from battery is very low. ACT2801 system operation  
flow chart as shown in Figure 1, and ACT2801C  
system operation flow chart as shown in Figure 2.  
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 with programmable  
input current limit. When output is over loaded, the  
input switch Q1 starts going into linear mode and  
thus output voltage starts to drop. If output voltage  
drops below 4.25V, the input switch Q1 turns off  
and restart in 2 seconds.  
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  
ACT2801/ACT2801C 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 100ms, boost converter is  
enabled.  
With the advanced ACT2801/ACT2801C  
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.  
Table 1: Mode Selection  
HZ PIN  
VIN Valid  
Mode  
0
0
0
1
1
0
1
1
Modes of Operation  
Boost  
Charge  
HZ  
Charge  
ACT2801/ACT2801C 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  
Flashlight  
ACT2801C 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. If another 3 seconds event  
happen, the flashlight will be switched off.  
Figure 1:  
ACT2801 System Operation Flow Chart  
Innovative PowerTM  
- 9 -  
www.active-semi.com  
Copyright © 2014 Active-Semi, Inc.