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PDF LTC4416 Data sheet ( Hoja de datos )
| Número de pieza | LTC4416 | |
| Descripción | Low Loss Dual PowerPath Controllers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Designed Specifically to Drive Large and Small QG
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
A■ PSpPaLceICSaAviTngIO10U-LSead MSOP Package
■ 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.
LTC4416w/wLwT.DCataS4he4et41U.c6om-1
36V, Low Loss Dual
PowerPath Controllers for
Large PFETs
DESCRIPTIO
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 PowerPathTM
controllers with soft switchover control. The “soft-off”
switchover permits the users to transfer between two dis-
similar voltages without excessive voltage undershoot (or
VDROOP) 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.
TYPICAL APPLICATIO
Automatic PowerPath Switchover
V1 = 12V (FAIL)
V1 = 13.5V (RESTORE) PRIMARY SUPPLY
V1
221k
SUP75P03_07
187k 24.9k
GND
V2
V2 = 10.8V
LTC4416
E1 V1
GND G1
E2 VS
H2 G2
H1 V2
BACKUP SUPPLY SUP75P03_07
VS
4416 TA01
LTC4416 vs Schottky Diode
Forward Voltage Drop
8.0
cONSTANT
RON
3.6
LTc4416
cONSTANT
VOLTAGE
ScHOTTKY
DIODE
0
0.02
FORWARD VOLTAGE (V)
0.5
4416 TA01b
Under and Overvoltage Shutdown Operation
VIN
221k
75k
VTH2 WITH
HYSTERESIS
24.9k
GND
VTH1 WITH
HYSTERESIS
187k 24.3k
182k LTC4416-1
H1 G1
E1 V1
GND VS
E2 V2
H2 G2
VOUT
TO
LOAD
4416 TA01c
UV ENABLED AT 5V, VIN RESTORED TO LOAD WHEN VIN RISES TO 5.5V
OV ENABLED AT 13.5V, VIN RESTORED TO LOAD WHEN VIN FALLS TO 12V
4416fa
1 page  
PI FU CTIO S
H1 (Pin 1): Open-Drain Comparator Output of the E1 Pin.
If E1 > VREF, the H1 pin will go high impedance, otherwise
the pin will be grounded. The maximum voltage permitted
on this pin is 7V. This pin provides support for setting up
hysterisis to an external resistor network.
E1 (Pin 2): LTC4416 Comparator Enable Input. A high
signal greater than VREF will enable the V1 path. The ideal
diode action will then determine if the V1 path should turn
on by controlling any PFET(s) connected to the G1 pin.
If the E1 signal is driven low, the V1 path will perform a
“soft-off” provided the PFET(s) are properly configured
for blocking DC current. An internal current sink will pull
the E1 pin down when the E1 input exceeds 1.5V.
E1 (Pin 2): LTC4416-1 Comparator Enable Input. A high
signal greater than VREF will enable the V1 path. The ideal
diode action will then determine if the V1 path should turn
on by controlling any PFET(s) connected to the G1 pin.
If the E1 signal is driven low, the V1 path will be quickly
disabled by enabling the “fast-off” feature, pulling the G1
gate high. An internal current sink will pull the E1 pin down
when the E1 input exceeds 1.5V.
GND (Pin 3): Ground. This pin provides a power return
path for all the internal circuits.
E2 (Pin 4): LTC4416 Comparator Enable Input. A low
signal less than VREF will enable the V2 path. The ideal
diode action will then determine if the V2 path should turn
on by controlling any PFET(s) connected to the G2 pin.
If the E2 signal is driven high, the V2 path will perform a
“soft-off” provided the PFET(s) are properly configured
for blocking DC current. An internal current sink will pull
the E2 pin down when the E2 input exceeds 1.5V.
E2 (Pin 4): LTC4416-1 Comparator Enable Input. A low
signal less than VREF will enable the V2 path. The ideal
diode action will then determine if the V2 path should turn
on by controlling any PFET(s) connected to the G2 pin.
If the E2 signal is driven high, the V2 path will be quickly
disabled by enabling the “fast-off” feature, pulling the G2
gate high. An internal current sink will pull the E2 pin down
when the E2 input exceeds 1.5V.
H2 (Pin 5): Open-Drain Comparator Output of the E2 Pin.
If E2 > VREF, the H2 pin will go high impedance, otherwise
LTC4416w/wLwT.DCataS4he4et41U.c6om-1
the pin will be grounded. The maximum voltage permitted
on this pin is 7V. This pin provides support for setting up
hysterisis to an external resistor network.
G2 (Pin 6): Second P-Channel MOSFET Power Switch
Gate Drive Pin. This pin is directed by the second power
controller to maintain a forward regulation voltage (VFR)
of 25mV between the V2 and VS pins when V2 is greater
than VS. When V2 is less than VS, the G2 pin will pull up
to the VS pin voltage, turning off the second P-channel
power switch.
V2 (Pin 7): Second Input Supply Voltage. Supplies power
to the second power controller and the band-gap refer-
ence. V2 is one of the two voltage sense inputs to the
second internal power controller (the other input to the
second internal power controller is the VS pin). This input
is usually supplied power from the second, or backup,
power source. This pin can be bypassed to ground with
a capacitor in the range of 0.1µF to 10µF if needed to
suppress load transients.
VS (Pin 8): Power Sense Input Pin. Supplies power to
the internal circuitry of both the first and second power
controller and the band-gap reference. This pin is also a
voltage sense input to both internal analog controllers
(the other input to the first controller is the V1 pin and
the other input to the second controller is the V2 pin.)
This input may also be supplied power from an auxiliary
source which also supplies current to the load.
V1 (Pin 9): First Input Supply Voltage. Supplies power to
the first power controller and the band-gap reference. V1
is one of the two voltage sense inputs to the first internal
power controller (the other input to the first internal power
controller is the VS pin). This input is usually supplied
power from the first, or primary, power source. This pin
can be bypassed to ground with a capacitor in the range
of 0.1µF to 10µF if needed to suppress load transients.
G1 (Pin 10): First P-Channel MOSFET Power Switch Gate
Drive Pin. This pin is directed by the first power controller
to maintain a forward regulation voltage (VFR) of 25mV
between the V1 and VS pins when V1 is greater than VS.
When V1 is less than VS, the G1 pin will pull up to the VS pin
voltage, turning off the first P-channel power switch.
4416fa
5 Page 
APPLICATIO S I FOR ATIO
Overvoltage
VFAIL
=
VETH
•
R2A +R2c||R2E
R2c||R2E
=
1.222V
•
221k+ 24.9k||187k
24.9k || 187k
=
13.51V
VRESTORE
=
VETH
•
R2A +R2c
R2c
=
1.222V
•
221k + 24.9k
24.9k
=
12.07V
The over and undervoltage lockout circuits are shown here
working in tandem. It is possible to configure the circuit
for either over or undervoltage lockout by using only one
of the voltage paths and eliminating the components from
the other. Refer to Figure 7 for an LTC4416-1 configured
for overvotlage protection. If the input does not go below
ground, transistor Q1 can be eliminated.
The LTC4416-1 should be used in this configuration rather
than the LTC4416 because the LTC4416-1 will turn-off
rapidly if an over or undervoltage condition is detected.
Refer to Figure 8 for a comparison of the transient response
of the two ICs using the circuit configuration of Figure 6.
The LTC4416 will not turn-off quickly in an overvoltage
or undervoltage condition because the “fast-off” feature
is not enabled. This will cause the output to travel beyond
the desired range.
VIN
VTH2 WITH
HYSTERESIS
R2C
24.9k
GND
R2A
221k
R1A
100k
LTC4416-1
H1 G1
R2E
187k
E1
V1
GND VS
E2 V2
H2 G2
Q1 Q2
VOUT
TO
LOAD
4416 F07
Figure 7. LTC4416-1 Configured for Overvoltage Protection
LTC4416w/wLwT.DCataS4he4et41U.c6om-1
Figure 9 contains a rapidly changing input voltage on a
much smaller time scale in comparison to Figure 8. The
LTC4416 will require the tE(OFF) time prior to the rapid pull-
up current being applied. The gate voltage will be pulled
high with IG(OFF) which has a minimum current of 500µA.
The discharge time of the gate will be dependent on the
capacitance of the external FET and the initial gate-source
voltage of the circuit. The total time delay will equal:
tDELAY = tE(OFF) + tDIScHARGE
=
tE(OFF)
+
cGS • ∆V
IG(OFF)
20
VOUT
LTC4416
15
10
VOUT
LTC4416-1
VOUT
LTC4416-1
5 VIN
VOUT
LTC4416
0
0 20 40 60 80
TIME (ms)
4416 F08
Figure 8. Transient Response of the LTC4416 vs the LTC4416-1
Light Load with a Large Capacitor on VOUT
13.60
13.55
VIN
LTC4416
LTC4416-1
13.50
13.45
13.40
tE(OFF)
GATE DISCHARGE TIME
=
C
∆V
IG(OFF)
0
0 5 10 15 20 25 30 35 40
TIME (µs)
4416 F09
Figure 9. Close Up of the Transient Response of the LTC4416-1
to a Rapidly Rising Input
Information furnished by Linear Technology corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
4416fa
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4416.PDF ] | |
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