LTC4411
1
4411fa
LTC4411
SCHOTTKY
DIODE
CONSTANT I
ON
CONSTANT
R
ON
CONSTANT
V
ON
V
FWD
FORWARD VOLTAGE (V)
LTC4411 FO1b
SLOPE
1/R
ON
SLOPE
1/R
FWD
I
OC
I
MAX
I
FWD
CURRENT (A)
IN
GND
CTL
OUT
STAT
LTC4411
WALL
ADAPTER
INPUT
TO
LOAD
4.7µF
STATUS OUTPUT
IS LOW WHEN WALL
ADAPTER IS SUPPLYING
LOAD CURRENT
BATTERY
CELL(S)
470k
4411 F01
VCC
TYPICAL APPLICATIO
U
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT and
PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
■
Low Loss Replacement for PowerPath
TM
OR’ing Diodes
■
Small Regulated Forward Voltage (28mV)
■
2.6A Maximum Forward Current
■
Low Forward ON Resistance (140mΩ Max)
■
Low Reverse Leakage Current (<1µA)
■
2.6V to 5.5V Operating Range
■
Internal Current Limit Protection
■
Internal Thermal Protection
■
No External Active Components
■
Pin-Compatible Monolithic Replacement
for the LTC4412
■
Low Quiescent Current (40µA)
■
Low-Profile (1mm) 5-lead SOT-23 Package
2.6A Low Loss
Ideal Diode in ThinSOT
TM
The LTC
®
4411 is an ideal diode IC, capable of supplying up
to 2.6A from an input voltage between 2.6V and 5.5V. The
LTC4411 is housed in a 5-lead 1mm profile SOT-23
package.
The LTC4411 contains a 140mΩ P-channel MOSFET con-
necting IN to OUT. During normal forward operation, the
drop across the MOSFET is regulated to as low as 28mV.
Quiescent current is less than 40µA for load currents up to
100mA. If the output voltage exceeds the input voltage, the
MOSFET is turned off and less than 1µA of reverse current
flows from OUT to IN. Maximum forward current is limited
to a constant 2.6A (typical) and internal thermal limiting cir-
cuits protect the part during fault conditions.
An open-drain STAT pin indicates conduction status. The
STAT pin can be used to drive an auxiliary P-channel
MOSFET power switch connecting an alternate power
source when the LTC4411 is not conducting forward
current.
An active-high control pin turns off the LTC4411 and
reduces current consumption to less than 25µA. When
shut off, the LTC4411 indicates this condition with a low
voltage on the status signal.
Figure 1. Automatic Switchover of Load
Between a Battery and a Wall Adapter
■
Cellular Phones
■
Handheld Computers
■
Digital Cameras
■
USB Peripherals
■
Uninterrupted Supplies
■
Logic Controlled Power Switch
LTC4411 vs Schottky Diode
Forward Voltage Characteristics
2
LTC4411
4411fa
IN, OUT, STAT, CTL Voltage .......................... –0.3 to 6V
Operating Ambient Temperature Range
(Note 2) ...............................................–40°C to 85°C
Operating Junction Temperature
(Note 3) .............................................–40°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Continuous Power Dissipation
(Derate 10mW/°C above 70°C)...................... 500mW
ORDER PART
NUMBER
S5 PART
MARKING
T
JMAX
= 125°C, θ
JA
= 250°C/W (Note 3) LTAEN
LTC4411ES5
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
5 OUT
4 STAT
IN 1
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
GND 2
CTL 3
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 6)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
, V
OUT
Operating Supply Range ●2.6 5.5 V
I
QF
Quiescent Current in Forward Regulation V
IN
= 3.6V, I
LOAD
= 100mA 40 µA
(Note 4)
I
Q(Off)
Quiescent Current in Shutdown V
IN
= 3.6V, V
STAT
= 0V, V
CTL
> V
IH
●22 25 µA
I
QRIN
Quiescent Current While in Reverse V
IN
= 3.6V ●1.3 1.8 2.3 µA
Turn-Off. Current Drawn from V
IN
V
OUT
= 3.7V
I
QROUT
Quiescent Current While in Reverse V
IN
= 3.6V ●14 17 23 µA
Turn-Off. Current Drawn from V
OUT
V
OUT
= 3.7V
I
LEAK
V
IN
Current When V
OUT
Supplies Power V
IN
= 0V, V
OUT
= 5.5V –1 1 µA
V
FWD
Forward Turn-On Voltage (V
IN
– V
OUT
)V
IN
= 3.6V ●81728 mV
–V
RTO
Reverse Turn-Off Voltage (V
OUT
– V
IN
)V
IN
= 3.6V –4 5 14 mV
R
FWD
Forward ON Resistance, ∆(V
IN
-V
OUT
)/∆(I
LOAD
)V
IN
= 3.6V, 100mA < I
LOAD
< 500mA ●100 140 mΩ
R
ON
ON Resistance in Constant R
ON
Mode V
IN
= 3.6V, I
LOAD
= 1000mA ●140 245 mΩ
UVLO Undervoltage Lockout V
IN
Rising, 0°C < T
A
< 85°C 2.5 V
V
IN
Rising ●2.6 V
V
IN
Falling ●1.6 V
STAT Output
I
S(SNK)
STAT Pin Sink Current V
IN
= 3.6V, V
OUT
> V
IN
+ V
RTO
, 7 11 18 µA
V
CTL
> V
TH
+ V
HYST
I
S(OFF)
STAT Pin Off Current V
IN
= 3.6V, V
OUT
< V
IN
– V
FWD
,–1 1µA
V
CTL
< V
TH
– V
HYST
t
S(ON)
STAT Pin Turn-On Time 1.2 1.4 µs
t
S(OFF)
STAT Pin Turn-Off Time 1.1 1.25 µs
CTL Input
V
TH
CTL Input Threshold Voltage V
TH
= (V
IL
+ V
IH
)/2 ●390 460 530 mV
V
HYST
CTL Input Hysteresis V
HYST
= (V
IH
– V
IL
)90mV
I
CTL
CTL Input Pull-Down Current V
OUT
< V
IN
= 3.6V, V
CTL
= 1.5V ●2 3.5 6 µA
Short-Circuit Response
I
OC
Current Limit V
IN
= 3.6V (Note 5) 1.8 2.6 A
I
QOC
Quiescent Current While in V
IN
= 3.6V, I
OUT
= 1.8A 575 1100 µA
Overcurrent Operation
LTC4411
3
4411fa
Measured Thermal Resistance (2-Layer Board*)
COPPER AREA BOARD THERMAL RESISTANCE
TOPSIDE BACKSIDE AREA JUNCTION-TO-AMBIENT
2500mm
2
2500mm
2
2500mm
2
125°C/W
1000mm
2
2500mm
2
2500mm
2
125°C/W
225mm
2
2500mm
2
2500mm
2
130°C/W
100mm
2
2500mm
2
2500mm
2
135°C/W
50mm
2
2500mm
2
2500mm
2
150°C/W
*Each layer uses one ounce copper
LOAD CURRENT (A)
0.5 1.5 2.51.0 2.0 3.0
4411 G01
QUIESCENT CURRENT (µA)
0
LOAD CURRENT (A) LOAD CURRENT (A)
0.5 1.5 2.51.0 2.0 3.0
0
TA = –40°C
TA = 0°C
TA = 40°C
TA = 80°C
TA = 120°C
FORWARD VOLTAGE (V)
4411 G02
0
RESISTANCE (Ω)
0.5 1.0 1.5 2.0
4411 G03
1000 0.5
0.4
0.3
0.2
0.1
0.15
0.10
0.30
0.25
0.20
0.05
0
100
10 0
TA = –40°C
TA = 0°C
TA = 40°C
TA = 80°C
TA = 120°C
TA = –40°C
TA = 0°C
TA = 40°C
TA = 80°C
TA = 120°C
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 6)
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Typical IQF vs ILOAD at VIN = 3.6V VFWD vs ILOAD at VIN = 3.6V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC4411E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C ambient
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• 150°C/W)
The following table lists thermal resistance for several different board sizes
and copper areas. All measurements were taken in still air on 3/32" FR-4
board with the device mounted on topside.
Note 4: Quiescent current increases with load current, refer to plot of I
QF
vs I
LOAD
.
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6: Current into a pin is positive and current out of a pin is negative.
All voltages are referenced to GND.
RFWD and RON vs ILOAD at
VIN = 3.6V
4
LTC4411
4411fa
UU
U
PI FU CTIO S
IN (Pin 1): Ideal Diode Anode and Positive Power Supply
for LTC4411. When operating LTC4411 as a switch it must
be bypassed with a low ESR ceramic capacitor of 1µF. X5R
and X7R dielectrics are preferred for their superior voltage
and temperature characteristics.
GND (Pin 2): Power and Signal Ground for the IC.
CTL (Pin 3): Controlled Shutdown Pin. Weak (3µA) Pull-
Down. Pull this pin high to shut down the IC. Tie to GND
to enable. Can be left floating when not in use.
STAT (Pin 4): Status Condition Indicator. This pin indi-
cates the conducting status of the LTC4411. If the part is
forward biased (V
IN
> V
OUT
+ V
FWD
) this pin will be Hi-Z.
If the part is reverse biased (V
OUT
> V
IN
+ V
RTO
), then this
pin will pull down 10µA through an open-drain. When
terminated to a high voltage through a 470k resistor, a
high voltage indicates diode conducting. May be left
floating or grounded when not in use.
OUT (Pin 5): Ideal Diode Cathode and Output of the
LTC4411. Bypass OUT with a nominal 1mΩ ESR capacitor
of at least 4.7µF. The LTC4411 is stable with ESRs down
to 0.2mΩ. However stability improves with higher ESRs.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
RFWD vs VSUPPLY
RFWD vs Temperature at
VIN = 3.6V IQROUT vs VREVERSE at VIN = 0V
01 234 56
REVERSE VOLTAGE (V)
LEAKAGE CURRENT (A)
10µ
1µ
100n
10n
4411 G07
T
A
= 60°C
T
A
= 80°C
T
A
= 100°C
T
A
= 120°C
SUPPLY VOLTAGE (V)
2.5
R
FWD
(Ω)
0.150
0.125
0.100
0.075
0.050 3.0 3.5 4.0 4.5
4411 G04
5.0 5.5
TEMPERATURE (°C)
–40
R
FWD
(Ω)
120
4411 G05
0–20 20 100
40 60 80
REVERSE VOLTAGE (V)
01 234 56
I
QROUT
CURRENT (A)
100µ
10µ
1µ
100n
4411 G06
T
A
= –40°C
T
A
= 0°C
T
A
= 40°C
0.15
0.10
0.20
0.05
0
T
A
= 80°C
T
A
= 120°C
4411 G08 4411 G09
T
A
= –40°C
T
A
= 0°C
T
A
= 40°C
T
A
= 80°C
T
A
= 120°C
V
CTRL
500mV/DIV
V
STAT
2V/DIV
V
OUT
2V/DIV
I
OUT
500mA/DIV
200µs/DIV
V
CTRL
500mV/DIV
V
STAT
2V/DIV
V
OUT
2V/DIV
I
OUT
50mA/DIV
20µs/DIV
ILEAK vs VREVERSE, VIN = 0V CTL Turn-On CTL Turn-Off
LTC4411
5
4411fa
BLOCK DIAGRA
W
Figure 2. Detailed Block Diagram
–
+
–
+
+
–P1
V
B
V
B
OVERTEMP
UVLO
OUT
MAX
10µA
3µA
V
REF
OFF
SHDB
+
–
3
1 5
4
2
STAT
OUT
CTL
IN
GND
4411 F02
A
V
GATE
Figure 3. LTC4411 vs Schottky Diode
Forward Conduction Characteristics
OPERATIO
U
The LTC4411 operation is described with the aid of
Figure 3. Forward regulation for the LTC4411 has three
operation modes depending on the magnitude of the load
current. For small load currents, the LTC4411 will provide
a constant voltage drop; this operating mode is referred to
as “constant V
ON
” regulation. As the current exceeds I
FWD
the voltage drop will increase linearly with the current with
a slope of 1/R
ON
; this operating mode is referred to as
“constant R
ON
” regulation. As the current increases fur-
ther, exceeding I
MAX
, the forward voltage drop will in-
crease rapidly; this operating mode is referred to as
“constant I
ON
” regulation. The characteristics for the
following parameters: R
FWD
, R
ON
, V
FWD
, I
FWD
, and I
MAX
are specified with the aid of Figure 3.
Operation begins when the power source at IN rises above
the UVLO voltage of 2.4V (typ) and the CTL (control) pin
is low. If only the voltage at the IN pin is present, the power
source to LTC4411 (V
DD
) will be supplied from the IN pin.
The amplifier (A) will deliver a voltage proportional to the
difference between V
IN
and V
OUT
to the gate (V
GATE
) of the
internal P-channel MOSFET (P1), driving this gate voltage
below V
IN
. This will turn on P1. As P1 conducts, V
OUT
will
be pulled up towards V
IN
. The LTC4411 will then control
V
GATE
to maintain a low forward voltage drop. The system
is now in forward regulation and the load at OUT will be
powered from the supply at IN. As the load current varies,
V
GATE
will be controlled to maintain a low forward voltage
drop. If the load current exceeds P1’s ability to deliver the
current, as V
GATE
approaches GND, the P1 will behave as
a fixed resistor, with resistance R
ON
, whereby the forward
voltage will increase with increased load current. As I
LOAD
increases further (I
LOAD
> I
MAX
), the LTC4411 will regulate
the load current as described below. During the forward
regulation mode of operation the STAT pin will be an open
circuit.
V
FWD
I
OC
I
MAX
I
FWD
FORWARD VOLTAGE (V)
0
LOAD CURRENT (A)
3.0
2.5
2.0
1.5
1.0
0.5
00.25 0.5 0.75 1.0
4411 F03
T
A
= 40°C
SLOPE
1/R
ON
SLOPE
1/R
FWD
SCHOTTKY
DIODE
LTC4411
6
LTC4411
4411fa
APPLICATIO S I FOR ATIO
WUUU
INTRODUCTION
The LTC4411 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.
Figure 4. State Transition Diagram
CONSTANT RON
REGULATION
CONSTANT ION
REGULATION
CONSTANT VON
REGULATION
REVERSE
BIASED
VIN – VOUT < VFWD
IOUT > IFWD IOUT < IFWD
IOUT > IMAX IOUT < IMAX
VIN – VOUT > VFWD
ISTAT = 0
DIODE ON
ISTAT = 10µA
DIODE OFF
ISTAT = 0
DIODE OFF
ISTAT = 0
DIODE OFF
ISTAT = 10µA
DIODE OFF
ISTAT = 0
DIODE ON
ISTAT = 0
DIODE ON
CONTROL
SHUTDOWN
UNDER
VOLTAGE
LOCK-OUT
OVER
TEMPERATURE
SHUTDOWN
TJ < 140°C
TJ > 150°C
VDD > 2.4
VDD < 2.3
VCTL < VIL
4411 F04
NORMAL OPERATION
VCTL > VIH
WHERE:
VDD = MAX {VIN, VOUT}
VIL = VTH – VHYST/2
VIH = VTH + VHYST/2
When the load current exceeds I
MAX
, an over current
condition is detected and the LTC4411 will limit the output
current. This will cause the output voltage to drop as the
load current exceeds the amount of current that the
LTC4411 can supply. This condition will increase the
power consumption within the LTC4411.
When an alternate power source is connected to the
output, the LTC4411 will sense the increased voltage at
OUT, and the amplifier (A) will increase the voltage at
V
GATE
. When V
OUT
is higher than V
IN
+
V
RTO
, the internal
power source for the LTC4411 (V
DD
) will be diverted to
source current from the OUT pin. At the same time V
GATE
will be pulled to V
DD
, which will turn off P1. The system is
now in the reverse turn-off mode. Power to the load is
being delivered from an alternate supply, and only a small
OPERATIO
U
current is drawn from IN to sense the potential V
IN
. During
reverse turn-off mode the STAT pin will sink 10µA to
indicate that the diode is not conducting.
When the CTL input is asserted (high), P1 will have its gate
voltage pulled high, and the STAT pin will sink 10µA. A 3µA
pull-down current on the CTL pin will ensure a low level at
this input if it is left open circuited.
The overtemperature condition is detected when the
internal die temperature increases beyond 150°C. The
overtemperature condition will cause the gate amplifier
(A) as well as P1 to be shut off. When the internal die
temperature cools to below 140°C, the amplifier will turn
on and revert to normal operation. Note that prolonged
operation under overtemperature conditions will degrade
reliability.
Automatic PowerPath Control
Figure 1 illustrates an application circuit for automatic
switchover of a load between a battery and a wall adapter
or other power input. With initial application of the battery,
the load will be charged up as the LTC4411 turns on. The
LTC4411 will control the gate voltage of its internal MOSFET
to reduce the MOSFET’s voltage drop to a low forward
voltage (V
FWD
). The system is now in the forward regula-
LTC4411
7
4411fa
tion mode, the forward voltage will be kept low by control-
ling the gate voltage of the internal MOSFET to react to
changes in load current. Should the wall adapter input be
applied, the Schottky diode will pull up the output voltage,
connected to the load, above the battery voltage. The
LTC4411 will sense that the output voltage is higher than
the battery voltage and will turn off the internal MOSFET.
The STAT pin will then sink current indicating an auxiliary
input is connected. The battery is now supplying no load
current and all load current flows through the Schottky
diode.
Microcontrolled PowerPath Monitoring and Control
Figure 6 illustrates an application circuit for microcontroller
monitoring and control of two power sources. The
microcontroller’s analog inputs, perhaps with the aid of a
resistor voltage divider, monitors each supply input and
commands the LTC4411 through the CTL input. Back-to-
back MOSFETs are used so that the parasitic drain-source
diode will not power the load when the MOSFET is turned
off (dual MOSFETs in one package are commercially
available).
Figure 5. Automatic Switchover of Load Between a
Primary and an Auxiliary Power Source with External
Dual P-Channel MOSFETs
Figure 6. Dual Battery Load Sharing with Automatic
Switchover of Load from Batteries to Wall Adapter
LOAD
STATUS
IN
GND
CTL
OUT
STAT
LTC4411
1
2
3
5
4
C2
4.7µF
C1
10µF
AUXILIARY P-CHANNEL
MOSFETS
MICROCONTROLLER
PRIMARY
POWER
SOURCE
AUXILIARY
POWER
SOURCE R1
470k
4411 F05
C1: C0805C106K8PAC
C2: C1206C475K8PAC
WHEN BOTH STATUS LINES ARE
HIGH, THEN BOTH BATTERIES
ARE SUPPLYING LOAD CURRENT.
WHEN BOTH STATUS LINES ARE
LOW, THEN WALL ADAPTER IS
PRESENT AND SUPPLYING FULL
LOAD CURRENT
IN
GND
CTL
OUT
STAT
LTC4411
1
2
3
BAT2
4411 F06
IN
GND
CTL
OUT
STAT
LTC4411
1
2
3
WALL
ADAPTER
INPUT
TO
LOAD
COUT
4.7µF
STATUS IS HIGH WHEN
BAT2 IS SUPPLYING
LOAD CURRENT
STATUS IS HIGH WHEN
BAT1 IS SUPPLYING
LOAD CURRENT
BAT1
470k
VCC
470k
VCC
5
4
CIN
1µF
CIN
1µF
CIN: C0805C105K8PAC
COUT: C1206C475K8PAC
turn off and no load current will be drawn from the
batteries. The STAT pins provide information as to which
input is supplying the load current. This concept can be
expanded to more power inputs.
Multiple Battery Charging
Figure 7 illustrates an application circuit for automatic dual
battery charging from a single charger. Whichever battery
has the lower voltage will receive the charging current until
both battery voltages are equal, then both will be charged.
When both are charging simultaneously, the higher ca-
pacity battery will get proportionally higher current from
the charger. For Li-Ion batteries, both batteries will achieve
the float voltage minus the forward regulation voltage of
40mV. This concept can apply to more than two batteries.
The STAT pin provides information as to which batteries
are being charged. For intelligent control, the CTL pin input
can be used with a microcontroller as shown in Figure 5.
Figure 7. Automatic Dual Battery Charging
from a Single Charging Source
IN
GND
CTL
OUT
STAT
LTC4411
1
2
3
4411 F07
IN
GND
CTL
OUT
STAT
LTC4411
1
2
3
BATTERY
CHARGER
INPUT
TO LOAD OR
PowerPath
CONTROLLER
TO LOAD OR
PowerPath
CONTROLLER
STATUS IS HIGH
WHEN BAT2 IS
CHARGING
STATUS IS HIGH
WHEN BAT1 IS
CHARGING
470k
VCC
470k
VCC
5
4
BAT1
BAT2
APPLICATIO S I FOR ATIO
WUUU
Load Sharing
Figure 6 illustrates an application circuit for dual battery
load sharing with automatic switchover of load from
batteries to wall adapter. Whichever battery is capable of
supplying the higher voltage will provide the load current
until it is discharged to the voltage of the other battery. The
load will then be shared between the two batteries accord-
ing to the capacity of each battery. The higher capacity
battery will provide proportionally higher current to the
load. When a wall adapter input is applied, both LTC4411s
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.
8
LTC4411
4411fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2003
LT/LT 0305 REV A • PRINTED IN USA
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PACKAGE DESCRIPTIO
U
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3)
S5 TSOT-23 0302
PIN ONE
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX
0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
APPLICATIO S I FOR ATIO
WUUU
Figure 8. Logic Controlled High Side Power Switch
IN
GND
CTL
OUT
STAT
LTC4411
1
2
3
5
4
TO
LOAD
COUT
4.7µF
4411 F08
SUPPLY
INPUT
LOGIC
INPUT
CIN
1µF
C
IN
: C0805C105K8PAC
COUT: C1206C475K8PAC
High Side Power Switch
Figure 8 illustrates an application circuit for a logic con-
trolled high side power switch. When the CTL pin is a
logical low, the LTC4411 will turn on, supplying current to
the load. When the CTL pin is a logical high, the LTC4411
will turn off and deny power to the load. If the load is
powered from another (higher voltage) source, the supply
connected to V
IN
remains disconnected from the load.
