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Designed Specifically to Drive Large and Small Q
G
PFETs
Very Low Loss Replacement for Power Supply
OR’ing Diodes
Wide Operating Voltage Range: 3.6V to 36V
–40°C to 125°C Operating Temperature Range
Reverse Battery Protection
Automatic Switching Between DC Sources
Low Quiescent Current: 35µA per Channel
Load Current Sharing
MOSFET Gate Protection Clamp
Precision Input Control Comparators for Setting
Switchover Threshold Points
Open-Drain Feedback Points for Customer Specified
Hysteresis Control
Minimal External Components
Space Saving 10-Lead MSOP Package
The LTC
®
4416/LTC4416-1 control two sets of external
P-channel MOSFETs to create two near ideal diode functions
for power switchover circuits. This permits highly efficient
OR’ing of multiple power sources for extended battery life
and low self heating. When conducting, the voltage drop
across the MOSFET is typically 25mV. For applications with
a wall adapter or other auxiliary power source, the load is
automatically disconnected from the battery when the aux-
iliary source is connected.
The LTC4416 integrates two interconnected PowerPath
TM
controllers with soft switchover control. The “soft-off”
switchover permits the users to transfer between two dis-
similar voltages without excessive voltage undershoot (or
V
DROOP
) in the output supply. The LTC4416/LTC4416-1 also
contain a “fast-on” feature that dramatically increases gate
drive current when the forward input voltage exceeds 25mV.
The LTC4416 “fast off” feature is engaged when the sense
voltage exceeds the input voltage by 25mV. The LTC4416-1
enables the fast off under the same conditions and when
the other external P-channel device is selected using the
enable pins.
The wide operating supply range supports operation from one
to eight Li-Ion cells in series. The low quiescent current (35µA
per channel) is independent of the load current. The gate driver
includes an internal voltage clamp for MOSFET protection.
The LTC4416/LTC4416-1 are available in low profile 10-lead
MSOP packages.
APPLICATIO S
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High Current PowerPath Switch
Industrial and Automotive Applications
Uninterruptible Power Supplies
Logic Controlled Power Switch
Battery Backup System
Emergency Systems with Battery Backups
, LT, LTc and LTM are registered trademarks of Linear Technology corporation.
PowerPath is a trademark of Linear Technology corporation.
All other trademarks are the property of their respective owners.
Automatic PowerPath Switchover
V1
V1 = 12V (FAIL)
V1 = 13.5V (RESTORE) PRIMARY SUPPLY
221k
LTC4416
187k
GND
24.9k
E1
GND
E2
H2
H1
V2
V2 = 10.8V
BACKUP SUPPLY SUP75P03_07
V1
G1
V
S
G2
V2
4416 TA01
SUP75P03_07
cURRENT (A)
3.6
LTc4416
U
TYPICAL APPLICATIO
LTC4416 vs Schottky Diode
Forward Voltage Drop
8.0
cONSTANT
R
ON
Under and Overvoltage Shutdown Operation
V
IN
221k
V
TH2
WITH
HYSTERESIS
ScHOTTKY
DIODE
24.9k
GND
V
TH1
WITH
HYSTERESIS
187k 24.3k
75k
182k
LTC4416-1
H1
G1
E1
GND
E2
H2
0.02
FORWARD VOLTAGE (V)
0.5
4416 TA01b
cONSTANT
VOLTAGE
V
S
0
UV ENABLED AT 5V, V
IN
RESTORED TO LOAD WHEN V
IN
RISES TO 5.5V
OV ENABLED AT 13.5V, V
IN
RESTORED TO LOAD WHEN V
IN
FALLS TO 12V
U
FEATURES
LTC4416/LTC4416-1
36V, Low Loss Dual
PowerPath Controllers for
Large PFETs
DESCRIPTIO
U
V1
V
S
V2
G2
V
OUT
TO
LOAD
4416 TA01c
4416fa
LINER [ LINEAR TECHNOLOGY ]
