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参数资料
| 型号： | LTC4413EDD-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC IDEAL DIODE DUAL 10-DFN |
| 标准包装： | 121 |
| 应用： | 手持/移动设备 |
| FET 型： | P 沟道 |
| 输出数： | 2 |
| 内部开关： | 是 |
| 延迟时间 - 开启： | 11µs |
| 延迟时间 - 关闭： | 2µs |
| 电源电压： | 2.5 V ~ 5.5 V |
| 电流 - 电源： | 40µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
LTC4413-1/LTC4413-2
APPLICATIONS INFORMATION
Introduction
The LTC4413-1/LTC4413-2 are intended for power control
applications that include low loss diode OR’ing, fully auto-
matic switchover from a primary to an auxiliary source of
power, microcontroller controlled switchover from a pri-
mary to an auxiliary source of power, load sharing between
two or more batteries, charging of multiple batteries from
a single charger and high side power switching.
Dual Battery Load Sharing with Automatic Switchover
to a Wall Adapter with Overvoltage Protection
(LTC4413-2 Only)
An application circuit for dual battery load sharing with
automatic switchover of load from batteries to a wall
adapter is shown in Figure 2. When the wall adapter is not
present, whichever battery has the higher voltage provides
the load current until it has discharged to the voltage of the
other battery. The load is shared between the two batter-
ies according to the capacity of each battery. The higher
capacity battery provides proportionally higher current to
the load. When a wall adapter input is applied, the output
voltage rises as the body diode in MP2 conducts. When
the output voltage is larger than the battery voltages, the
LTC4413 turns off and very little load current is drawn
from the batteries. At this time, the STAT pin pulls down
MP1 MP2
IRLML6402 IRLML6402
WALL
the gate voltage of MP2, causing it to conduct. This status
signal can be used to provide information as to whether
the wall adapter (or BATB) is supplying the load current.
If the wall adapter voltage exceeds the OVI trip threshold
(V OVIH ) then the wall adapter is disconnected via the
external PFET, MP1. The OVI voltage can be monitored
(through a voltage divider if necessary) to determine if
an overvoltage condition is present.
Capacitor C2 is required to dynamically pull up on the
gate of PFET MP1 if a fast edge occurs at the wall adapter
input during a hot plug. In the event that capacitor C2 (or
the gate-to-source of MP1) is precharged below the OVI
rising threshold. When a high voltage spike occurs, the
OVP output cannot guarantee turning off MP1 before the
load voltage exceeds the absolute maximum voltage for
the LTC4413-2. This may occur in the event that the wall
adapter suddenly steps from 5.5V to a much higher value.
In this case, a Zener diode is recommended to keep the
output voltage to a safe level.
Automatic PowerPath Control
Figure 3 illustrates an application circuit for microcon-
troller monitoring and control of two power sources. The
microcontroller’s analog inputs (perhaps with the aid of
a resistor voltage divider) monitor each supply input and
the LTC4413-1 status, and then commands the LTC4413-1
through the two ENBA/ENBB control inputs.
ADAPTER
INPUT
JACK
C1
0.10μF
R1
1Ω
C2
10nF
OPTIONAL
MICROCONTROLLER
R STAT
470k
6.2V
2
9
3
8
R STAT
C OUT
4.7 μ F
3
BATA
+
BATB
+
4 7
1 INA OUTA 10
IDEAL
ENBA STAT
LTC4413-2
GND OVI
ENBB OVP
5 INB OUTB 6
IDEAL
DFLZ6V2-7
TO LOAD
10nF
470k
STAT
OVP
441312 F02
C1: C1206C106K8PAC
C2: C0403C103K8PAC
C OUT : C1206C475K8PAC
PRIMARY
POWER
SOURCE
AUXILIARY
POWER
SOURCE
C A
10μF
R A
1 Ω
C B
10μF
R B
1 INA OUTA 10
2 IDEAL 9
ENBA STAT
LTC4413-1
GND
4
ENBB
5 INB OUTB 6
IDEAL
STAT
441312 F03
LOAD
C1
4.7μF
1 Ω
Figure 2
Figure 3
441312fd
11
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