ltc4413edd-trpbf Linear Technology Corporation, ltc4413edd-trpbf Datasheet - Page 9

• Manufacturer Part Number: ltc4413edd-trpbf
• Description: Dual 2.6a, 2.5v To 5.5v, Ideal Diodes In 3mm ? 3mm Dfn
• Manufacturer: Linear Technology Corporation

OPERATIO
APPLICATIO S I FOR ATIO
For short durations after the output is shorted, the current
may exceed I
current can be large, depending on the load current imme-
diately before the short circuit occurs. During overcurrent
operation, the power consumption of the LTC4413 is large,
and is likely to cause an overtemperature condition as the
internal die temperature exceeds the thermal shutdown
temperature.
Overtemperature Protection
The overtemperature condition is detected when the inter-
nal die temperature increases beyond 150°C. An overtem-
perature condition causes the gate amplifiers (A and B) as
well as the two P-channel MOSFETs (PA and PB) to be shut
off. When the internal die temperature cools to below
140°C, the amplifiers turn on and revert to normal opera-
tion. Note that prolonged operation under overtempera-
ture conditions degrades reliability.
Channel Selection and Status Output
Two active-high control pins independently turn off the
two ideal diodes contained within the LTC4413, control-
ling the operation mode as described by Table 1. When the
selected channel is reverse biased, or the LTC4413 is put
into low power standby, the status signal indicates this
condition with a low voltage.
Introduction
The LTC4413 is intended for power control applications
that include low loss diode ORing, fully automatic
switchover from a primary to an auxiliary source of power,
microcontroller controlled switchover from a primary 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. The LTC4413
is optimized for low quiescent power consumption at the
expense of transient response. For more demanding slew
MAX
. The magnitude of this peak short-circuit
U
U
U
W
U
Table 2. STAT Output Pin Funtion
Table 1. Mode Control
The function of the STAT pin depends on the mode that has
been selected. The following table describes the STAT pin
output current as a function of the mode selected, as well
as the conduction state of the two diodes.
rate or load transient applications, the pin compatible
LTC4413-1 is recommended.
Dual Battery Load Sharing with Automatic Switchover
to a Wall Adapter
An application circuit for dual battery load sharing with
automatic switchover of load from batteries to a wall adapter
is shown in Figure 3. When the wall adapter is not present,
whichever battery that has the higher voltage provides the
load current until it has discharged to the voltage of the
other battery. The load is then shared between the two
ENB1
High
High
Low
Low
ENB1
High
High
Low
Low
ENB2
High
High
Low
Low
ENB2
High
High
Low
Low
STATE
Diode OR (NB: The Two Outputs are Not Connected
Internal to the Device)
Diode A = Enabled, Diode B = Disabled
Diode A = Disabled, Diode B = Enabled
All 0ff (Low Power Standby)
CONDITIONS
Diode A Forward Bias,
Diode B Forward Bias
Diode A Forward Bias,
Diode B Reverse Bias
Diode A Reverse Bias,
Diode B Forward Bias
Diode A Reverse Bias,
Diode B Reverse Bias
Diode A Forward Bias,
Diode B Disabled
Diode A Reverse Bias,
Diode B Disabled
Diode A Disabled,
Diode B Forward Bias
Diode A Disabled
Diode B Reverse Bias
Diode A Disabled,
Diode B Disabled
LTC4413
STAT
I
I
I
I
I
I
I
I
I
SNK
SNK
SNK
SNK
SNK
SNK
SNK
SNK
SNK
= 0µA
= 0µA
= 9µA
= 9µA
= 0µA
= 9µA
= 0µA
= 9µA
= 9µA
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