LTC4413_15 Datasheet, PDF (1/12 Pages) Linear Technology – Dual 2.6A, 2.5V to 5.5V, Ideal Diodes

LTC4413
Dual 2.6A, 2.5V to 5.5V,
Ideal Diodes in 3mm × 3mm DFN
FEATURES
n _{2-Channel Ideal Diode ORing or Load Sharing}
n _{Low Loss Replacement for ORing Diodes}
n _{Low Forward On-Resistance (100mΩ Max at 3.6V)}
n _{Low Reverse Leakage Current (1μA Max)}
n _{Small Regulated Forward Voltage (28mV Typ)}
n _{2.5V to 5.5V Operating Range}
n _{2.6A Maximum Forward Current}
n _{Internal Current Limit and Thermal Protection}
n _{Slow Turn-On/Off to Protect Against Inductive}
Source Impedance-Induced Voltage Spiking
n _{Ultralow Quiescent Current Consumption, Low}
Power Alternative to the LTC4413-1
n _{Status Output to Indicate if Selected Channel is}
Conducting
n _{Programmable Channel On/Off}
n _{Low Profile (0.75mm) 10-Lead 3mm × 3mm DFN}
Package
APPLICATIONS
n _{Battery and Wall Adapter Diode ORing in Handheld}
Products
n _{Backup Battery Diode ORing}
n _{Power Switching}
n _{USB Peripherals}
n _{Uninterruptable Supplies}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The LTC^®4413 contains two monolithic ideal diodes,
each capable of supplying up to 2.6A from input voltages
between 2.5V and 5.5V. Each ideal diode uses a 100mΩ
P-channel MOSFET that independently connects INA to
OUTA and INB to OUTB. During normal forward operation
the voltage drop across each of these diodes is regulated
to as low as 28mV. Quiescent current is less than 40μA
for diode currents up to 1A. If either of the output voltages
exceeds its respective input voltages, that MOSFET is
turned off and less than 1μA of reverse current will flow
from OUT to IN. Maximum forward current in each MOSFET
is limited to a constant 2.6A and internal thermal limiting
circuits protect the part during fault conditions.
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, a status signal indicates this
condition with a low voltage.
A 9μA open-drain STAT pin is used to indicate conduction
status. When terminated to a positive supply through a
470k resistor, the STAT pin can be used to indicate that the
selected diode is conducting with a high voltage. This signal
can also be used to drive an auxiliary P-channel MOSFET
power switch to control a third alternate power source
when the LTC4413 is not conducting forward current.
The LTC4413 is housed in a 10-lead DFN package.
TYPICAL APPLICATION
WALL
ADAPTER
(0V TO 5.5V) _10μF
ENBA
GND LTC4413
ENBB
STAT
INB
OUTB
V_CC
470k
CONTROL CIRCUIT
STAT IS HIGH WHEN
BAT IS SUPPLYING
LOAD CURRENT
INA
BAT
OUTA
TO LOAD
4.7μF
4413 TA01
LTC4413 vs 1N5817 Schottky
2000
1500
1000
LTC4413
500
1N5817
0
0
100
200
300
400
V_FWD (mV)
4413 TA01b
4413fc
1