参数资料
| 型号： | LTC4413EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12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： | 25µA |
| 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 |
| 产品目录页面： | 1338 (CN2011-ZH PDF) |
LTC4413
OPERATION
The LTC4413 is described with the aid of the Block Diagram
(Figure 1). Operation begins when the power source at
V INA or V INB rises above the undervoltage lockout (UVLO)
voltage of 2.4V and either of the ENBA or ENBB control
pins is low. If only the voltage at the V INA pin is present, the
power source to the LTC4413 (V DD ) will be supplied from
the V INA pin. The ampli?er (A) pulls a current proportional
to the difference between V INA and V OUTA from the gate
(V GATEA ) of the internal PFET (PA), driving this gate voltage
below V INA . This turns on PA. As V OUTA is pulled up to
a forward voltage drop (V FWD ) of 20mV below V INA , the
LTC4413 regulates V GATEA to maintain the small forward
voltage drop. The system is now in forward regulation and
the load at V OUTA is powered from the supply at V INA . As
the load current varies, V GATEA is controlled to maintain
V FWD until the load current exceeds the transistor’s (PA)
ability to deliver the current as V GATEA approaches GND.
At this point the PFET behaves as a ?xed resistor with
resistance R ON , whereby the forward voltage increases
slightly with increased load current. As the magnitude of
I OUT increases further (such that I LOAD > I OC ), the LTC4413
?xes the load current to the constant value I OC to protect
the device. The characteristics for parameters R FWD ,
R ON , V FWD and I OC are speci?ed with the aid of Figure 2,
illustrating the LTC4413 forward voltage drop versus that
of a Schottky diode.
If another supply is provided at V INB , the LTC4413 likewise
regulates the gate voltage on PB to maintain the output
voltage V OUTB just below the input voltage V INB . If this
I OC
SLOPE
1/R ON
I FWD
LTC4413
alternate supply, V INB , exceeds the voltage at V INA , the
LTC4413 selects this input voltage as the internal supply
(V DD ). This second ideal diode operates independently of
the ?rst ideal diode function.
When an alternate power source is connected to the load
at V OUTA (or V OUTB ), the LTC4413 senses the increased
voltage at V OUTA and ampli?er A increases the voltage
V GATEA , reducing the current through PA. When V OUTA is
higher than V INA + V RTO , V GATEA is pulled up to V DD , which
turns off PA. The internal power source for the LTC4413
(V DD ) is then diverted to source current from the V OUTA pin,
only if V OUTA is larger than V INB (or V OUTB ). The system
is now in the reverse turn-off mode. Power to the load is
being delivered from an alternate supply and only a small
current is drawn from V INA to sense the potential at V INA .
When the selected channel of the LTC4413 is in reverse
turn-off mode or both channels are disabled, the STAT pin
sinks 9μA of current (I SON ) if connected.
Channel selection is accomplished using the two ENB
pins, ENBA and ENBB. When the ENBA input is asserted
(high), PA’s gate voltage is pulled to V DD at a controlled
rate, limiting the turn-off time to avoid voltage spiking at
the input when being driven by an inductive source imped-
ance. A 3μA pull-down current on the ENB pins ensures
a low level at these inputs if left ?oating.
Slow Response Time
The LTC4413-1 (or LTC4413-2) is recommended for
applications with demanding load step or fast slew rate
requirements. The LTC4413-1 and LTC4413-2 provide bet-
ter load regulation in these environments at the expense
of higher quiescent current. The LTC4413 is optimized
for lower power consumption and should not be used in
high slew rate environments or when large and fast load
transients are anticipated.
SLOPE
1/R FWD
SCHOTTKY
DIODE
Overcurrent and Short-Circuit Protection
During an overcurrent condition, the output voltage droops
0
0
as the load current exceeds the amount of current that
FORWARD VOLTAGE (V)
Figure 2
4413 F02
the LTC4413 can supply. At the time when an overcurrent
condition is ?rst detected, the LTC4413 takes some time to
detect this condition before reducing the current to I MAX .
4413fc
8
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