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LTC4420CMSE Datasheet

18V Dual Input Micropower PowerPath Prioritizer

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LTC4420
18V Dual Input Micropower
PowerPath Prioritizer with
Backup Supply Monitoring
FEATURES
n Selects Highest Priority Valid Supply from Two
Inputs
n Wide 1.8V to 18V Operating Range
n Internal Dual 2Ω, 0.5A Switches
n Low 3.6µA Operating Current
n Low 320nA V2 Current When V1 Connected to OUT
n Blocks Reverse and Cross Conduction Currents
n Reverse Supply Protection to –15V
n Built-In V2 Test with Optional V2 Disconnect
n V2 Freshness Seal/Ship Mode
n ±1.5% Accurate Adjustable Switchover Threshold
n ±2.3% Accurate V2 Monitor and Comparator
n Overcurrent and Thermal Protection
n Thermally Enhanced 12-Pin 3mm × 3mm
DFN and 12-Lead Exposed Pad MSOP Packages
APPLICATIONS
n Low Power Battery Backup
n Portable Equipment
n Point-of-Sale (POS) Equipment
DESCRIPTION
The LTC®4420 is a dual input monolithic PowerPath™
prioritizer, with low operating current, that provides
backup switchover for keeping critical circuitry alive dur-
ing brownout and power loss conditions. Unlike diode-OR
products, little current is drawn from the inactive supply
even if its voltage is greater than the active supply.
Internal 2Ω, current limited PMOS switches provide
power path selection from a primary input (V1) or a backup
input (V2) to the output. Two adjustable voltage monitors
set via external resistive dividers provide flexibility in set-
ting V1 to V2 switchover and V2 undervoltage thresholds.
V1 is monitored continuously while V2 supply monitoring
includes controllable low duty cycle UV monitoring. When
primary input V1 drops, the ADJ monitor causes OUT to
be switched to V2. When V2 drops, it is disconnected from
OUT if V2DIS is low. Fast non-overlap switchover circuitry
prevents reverse and cross conduction while minimizing
output droop.
Auxiliary voltage monitor CMP1 provides flexible voltage
monitoring and output V2OK provides V2 undervoltage
status. Freshness seal mode prevents V2 battery discharge
during storage or shipment.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
5V WALL
ADAPTER
+
10µF
7.4V
Li-Ion
Typical Switchover Waveforms
V1
OUT
1M
ADJ CMPOUT1
237k
CMP1 V2OK
121k
LTC4420
V2
V2DIS
1M
V1UV
OUT
1M
V2OK
V2
2V/DIV
V1
2V/DIV
V2 MONITORING
INTERVAL
SWITCHOVER
THRESHOLD
V2 UNDERVOLTAGE
AND DISCONNECT
4.02M
280k
V2UV V2TEST
GNDSW
GND
TYPICAL VALUES:
SWITCHOVER THRESHOLD: V1 < 4V (V1 FALLING)
4420 TA01a
V1UV THRESHOLD: V1 < 4.4V (V1 FALLING)
V2OK THRESHOLD: V2 < 6V (V2 FALLING)
COUT = 10µF
ILOAD = 100mA
20ms/DIV
OUT
4420 TA01b
For more information www.linear.com/LTC4420
4420fa
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC4420CMSE Datasheet

18V Dual Input Micropower PowerPath Prioritizer

No Preview Available !

LTC4420
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Terminal Voltages
V1, V2.......................................................–15V to 24V
OUT........................................................ –0.3V to 24V
OUT – V2..................................................–24V to 39V
OUT – V1..................................................–24V to 39V
Input Voltages
ADJ, CMP1, V2UV, V2TEST, V2DIS
(Note 3) ................................................. –0.3V to 24V
Output Voltages
CMPOUT1, GNDSW, V2OK (Note 3) ....... –0.3V to 24V
Pin Currents (Note 2)
ADJ, CMP1, V2UV, CMPOUT1, GNDSW..............–1mA
V2TEST, V2DIS, V2OK .......................................–1mA
Operating Ambient Temperature Range
LTC4420C................................................. 0°C to 70°C
LTC4420I..............................................–40°C to 85°C
Junction Temperature (Notes 4, 5)......................... 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP Package.................................................. 300°C
PIN CONFIGURATION
TOP VIEW
V1 1
V2TEST 2
CMP1 3
ADJ 4
GND 5
CMPOUT1 6
12 V2
11 V2DIS
13
10 V2UV
GND
9 OUT
8 V2OK
7 GNDSW
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
V1 1
12 V2
V2TEST 2
11 V2DIS
CMP1 3
13
10 V2UV
ADJ 4
GND
9 OUT
GND 5
8 V2OK
CMPOUT1 6
7 GNDSW
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC4420#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4420CDD#PBF
LTC4420CDD#TRPBF LGMR
12-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC4420IDD#PBF
LTC4420IDD#TRPBF
LGMR
12-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC4420CMSE#PBF
LTC4420CMSE#TRPBF 4420
12-Lead Plastic Exposed Pad MSOP
0°C to 70°C
LTC4420IMSE#PBF
LTC4420IMSE#TRPBF 4420
12-Lead Plastic Exposed Pad MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V1 = 3.6V, V2 = 3.6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage and Currents
V1, V2
Operating Voltage Range
l 1.8
18
V
IV1
V1 Current, V1 Powering OUT
V1 Current, V2 Powering OUT
IOUT = 0, V1 = 8.4V, V2 = 3.6V
l
3.6 6.3
µA
V1 = 8.4V, V2 = 3.6V
l
500 800
nA
4420fa
2
For more information www.linear.com/LTC4420


Part Number LTC4420CMSE
Description 18V Dual Input Micropower PowerPath Prioritizer
Maker Analog Devices
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