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LTC3643IUDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3643
1
3643fb
For more information www.linear.com/LTC3643
TYPICAL APPLICATION
FEATURES DESCRIPTION
2A Bidirectional
Power Backup Supply
The LT C
®
3643 is a bidirectional synchronous step-up
charger and step-down converter which efficiently charges
a capacitor array up to 40V from an input supply between
3V to 17V. When the input supply falls below the program-
mable power-fail threshold, the step-up charger operates
in reverse as a synchronous step-down regulator to power
the system rail from the backup capacitor during this power
interuption/failure condition.
When charging the backup capacitor, an external low-value
sense resistor may be used to maintain an accurate cur-
rent limit from the input supply or implement PowerPath
™
functionality.
The step-down converter operates at a 1MHz switching
frequency, allowing small external components to be used.
Low quiescent current during regulation maximizes the
energy
usage from the backup capacitor.
40V Backup System Regulating System Supply to 5V
Approximate Charge/Backup Time Per
1mF of Storage Cap (40V Backup)
APPLICATIONS
n
Bidirectional Synchronous Boost Capacitor
Charger/Buck Regulator for System Backup
n
Wide Input Voltage Range: 3V to 17V
n
Up to 40V Capacitor Voltage Storage for High En-
ergy Backup
n
2A Maximum CAP Charge Current
n
Integrated Power N-Channel MOSFETs
(150mΩ Top and 75mΩ Bottom)
n
Integrated Power N-Channel MOSFET for Output/CAP
Disconnect (50mΩ)
n
Input Current Limit During Charging
n
Fast 1MHz Switching Frequency
n
±1% Reference Accuracy for System Voltage Regulation
n
Indicator Outputs for Charge Status and Input Power Fail
n
Low Profile 24-lead 3mm × 5mm QFN Package
n
Backup Capacitor Systems
n
Power Failure Backup Systems
n
Solid-State Drives
L, LT , LT C , LT M, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and PowerPath is trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents. Including 5481178, 6580258,
6498466, 6611131, 5705919.
0.1µF
0.01Ω
GND
PFO
CAPGD
FBSYS
PFI
RUN
GATE
LTC3643
SWINDISV
IN
CLP
CAP
FBCAP
BOOST
ITH
INTV
CC
392k
6.04k
ENERGY
STORAGE
4.7µH
47µF
22µF
4.7µF
1mF
SYSTEM LOAD
40V BACKUP
POWER
SUPPLY
+
470pF
22pF
3643 TA01a
400k
35.7k
44.2k
12.1k 6.04k
CHARGE TIME
BACKUP TIME WITH 2A LOAD
BACKUP TIME WITH 1A LOAD
BACKUP TIME WITH 0.5A LOAD
SYSTEM LOAD VOLTAGE (V)
3
6
9
12
15
0
CHARGE/BACKUP TIME (ms)
3643 TA01b
LTC3643
2
3643fb
For more information www.linear.com/LTC3643
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
............................................................. –0.3V to 17V
RUN
.................................................. –0.3V to V
IN
+0.3V
CLP
............................................................ –0.3V to 17V
CAP
............................................................ –0.3V to 42V
BOOST-SW
................................................... –0.3V to 4V
INTV
CC
, FBSYS, FBCAP ................................ –0.3V to 4V
PFI
............................................................... –0.3V to 4V
I
LIM
.............................................–0.3V to V
INTVCC
+0.3V
PFO, CAPGD
................................................ –0.3V to 6V
Operating Junction Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10sec).................... 260°C
(Note 1)
24 23 22 21
9 10
TOP VIEW
25
SGND
UDD PACKAGE
24-LEAD (3mm × 5mm) PLASTIC QFN
11 12
6
5
4
3
2
1
15
16
17
18
19
20
PGND
PGND
CAP
V
IN
V
IN
GATE
RUN
FBSYS
SW
SW
SW
INDIS
INDIS
BOOST
INTV
CC
PFI
CLP
NC
NC
I
LIM
FBCAP
ITH
CAPGD
PFO
14
7
13
8
T
JMAX
= 125°C, θ
JA
= 46°C/W, θ
JC
= 5.0°C/W
EXPOSED PAD (PIN 25) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3643EUDD#PBF LTC3643EUDD#TRPBF LGSX
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3643IUDD#PBF LTC3643IUDD#TRPBF LGSX
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 125°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.
(http://www.linear.com/product/LTC3643#orderinfo)
LTC3643
3
3643fb
For more information www.linear.com/LTC3643
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage V
IN
CAP
3.0 17
40
V
V
I
Q-IN
Input Quiescent Current Active Mode
Burst Mode
®
Shutdown Mode; RUN = 0V
800
400
10
800
20
µA
µA
µA
R
DS(ON)
Switch A On Resistance
Switch B On Resistance
Switch C On Resistance
V
CAP
>= V
IN
V
INTVCC
= 3.3V
V
BOOST
= 8.3V
50
75
150
mΩ
mΩ
mΩ
I
SW
Top Switch Leakage
Bottom Switch Leakage
V
CAP
= 40V, V
SW
= 0
V
CAP
= V
SW
= 40V
0.1
0.1
1
1
µA
µA
Boost Charger Regulation
V
CAP
Cap Voltage 40 V
V
FBCAP
Regulated Output Feedback Voltage
l
0.594 0.6 0.606 V
I
FBCAP
FBCAP Input Current ±10 nA
g
m
(EA) Error Amplifier Transconductance ITH = 1.2V 210 270 330 µS
I
LIM-BOOST
Peak Inductor Current Limit
(Bottom Switch Peak Limit)
l
3.0
2.8
3.2 3.4 A
A
t
OFF(MIN)-BOOST
Minimum Off-Time 70 ns
f
SW
Switching Frequency 1 MHz
Input Current
Limit Amplifier Regulated Voltage V
CLP-VIN
l
48.5
46
50
50
51.5
54
mV
mV
Buck Regulator Voltage Regulation
V
FBSYS
Regulated System Feedback Voltage
l
0.594 0.6 0.606 V
I
FBSYS
FBSYS Input Current ±10 nA
I
LIM-BUCK
Valley Inductor Current Limit
(Bottom Switch Valley Limit)
I
LIM
= FLOAT
I
LIM
= 0V
I
LIM
= V
INTVCC
l
l
l
2.0
2.9
3.8
2.6
3.7
4.7
3.2
4.5
5.6
A
A
A
A
A
A
t
ON(MIN)-BUCK
Minimum On-Time 30 ns
INTV
CC
Regulator
INTV
CC
Regulated Voltage 3.0 3.2 3.4 V
INTV
CC
UVLO INTV
CC
Rising 2.6 2.75 2.9 V
I/O Pins
V
RUN
RUN High Rising
RUN Hysteresis
l
1.12 1.2
100
1.28 V
mV
RUN Input Current V
RUN
= 12V, V
IN
= 12V 0 ±10 nA
V
PFI
PFI Input Threshold Falling
Rising (100mV hysteresis)
l
l
0.95
1.05
1.0
1.1
1.05
1.15
V
V
PFI Delay Time Falling
Rising
3
20
6
40
µs
µs
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 5V, V
RUN
= 2V unless otherwise noted. (Note 2)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC3643IUDD#TRPBF

Mfr. #:
Buy LTC3643IUDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC 2A Bidirectional Charger/ Regulator for System Power Backup
Lifecycle:
New from this manufacturer.
Delivery:
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