LTC4413EDD#PBF Linear Technology, LTC4413EDD#PBF Datasheet - Page 8

• Manufacturer Part Number: LTC4413EDD#PBF
• Description: IC IDEAL DIODE DUAL 10-DFN
• Manufacturer: Linear Technology

Specifications of LTC4413EDD#PBF

• Applications: Handheld/Mobile Devices
• Fet Type: P-Channel
• Number Of Outputs: 2
• Internal Switch(s): Yes
• Delay Time - On: 11µs
• Delay Time - Off: 2µs
• Voltage - Supply: 2.5 V ~ 5.5 V
• Current - Supply: 25µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Input Voltage: 5.5V
• No. Of Outputs: 2
• Power Dissipation Pd: 1.5W
• Supply Voltage Range: 2.5V To 5.5V
• No. Of Pins: 10
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC4413
OPERATION
The LTC4413 is described with the aid of the Block Diagram
(Figure 1). Operation begins when the power source at
V
voltage of 2.4V and either of the ENBA or ENBB control
pins is low. If only the voltage at the V
power source to the LTC4413 (V
the V
to the difference between V
(V
below V
a forward voltage drop (V
LTC4413 regulates V
voltage drop. The system is now in forward regulation and
the load at V
the load current varies, V
V
ability to deliver the current as V
At this point the PFET behaves as a fi xed resistor with
resistance R
slightly with increased load current. As the magnitude of
I
fi xes the load current to the constant value I
the device. The characteristics for parameters R
R
illustrating the LTC4413 forward voltage drop versus that
of a Schottky diode.
If another supply is provided at V
regulates the gate voltage on PB to maintain the output
voltage V
8
OUT
INA
FWD
ON
GATEA
, V
increases further (such that I
or V
INA
until the load current exceeds the transistor’s (PA)
FWD
) of the internal PFET (PA), driving this gate voltage
INA
pin. The amplifi er (A) pulls a current proportional
INB
OUTB
I
. This turns on PA. As V
and I
FWD
I
rises above the undervoltage lockout (UVLO)
OC
OUTA
ON
0
0
just below the input voltage V
, whereby the forward voltage increases
OC
is powered from the supply at V
SLOPE
1/R
LTC4413
are specifi ed with the aid of Figure 2,
FWD
GATEA
FORWARD VOLTAGE (V)
SLOPE
1/R
Figure 2
GATEA
FWD
ON
to maintain the small forward
INA
) of 20mV below V
and V
DD
is controlled to maintain
INB
GATEA
LOAD
) will be supplied from
, the LTC4413 likewise
INA
SCHOTTKY
DIODE
OUTA
OUTA
> I
approaches GND.
pin is present, the
OC
4413 F02
is pulled up to
), the LTC4413
from the gate
OC
INB
to protect
INA
. If this
INA
, the
FWD
. As
,
alternate supply, V
LTC4413 selects this input voltage as the internal supply
(V
the fi rst ideal diode function.
When an alternate power source is connected to the load
at V
voltage at V
V
higher than V
turns off PA. The internal power source for the LTC4413
(V
only if V
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
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
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
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 fl 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.
Overcurrent and Short-Circuit Protection
During an overcurrent condition, the output voltage droops
as the load current exceeds the amount of current that
the LTC4413 can supply. At the time when an overcurrent
condition is fi rst detected, the LTC4413 takes some time to
detect this condition before reducing the current to I
GATEA
DD
DD
OUTA
). This second ideal diode operates independently of
) is then diverted to source current from the V
, reducing the current through PA. When V
OUTA
(or V
OUTA
INA
is larger than V
OUTB
+ V
and amplifi er A increases the voltage
INB
), the LTC4413 senses the increased
RTO
, exceeds the voltage at V
SON
, V
INA
GATEA
) if connected.
to sense the potential at V
INB
is pulled up to V
(or V
OUTB
DD
at a controlled
). The system
DD
OUTA
INA
, which
OUTA
, the
MAX
4413fc
pin,
INA
is
.
.