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LTC3539EDCB-2#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC3539/LTC3539-2
1
35392fc
For more information www.linear.com/3539/3539-2
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
2A, 1MHz/2MHz
Synchronous Step-Up
DC/DC Converters
The LT C
®
3539/LTC3539-2 are synchronous, 2A step-up
DC/DC converters with output disconnect. Synchronous
rectification enables high efficiency in the low profile
2mm × 3mm DFN package. Battery life is extended with
a 700mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 1MHz (LTC3539) or 2MHz
(LTC3539-2) minimizes solution footprint by allowing the
use of tiny, low profile inductors and ceramic capacitors.
The current mode PWM design is internally compensated,
reducing external parts count. The LTC3539/LTC3539-2
feature a pin-enabled automatic Burst Mode operation at
light load conditions. Anti-ring circuitry reduces EMI by
damping the inductor in discontinuous mode. Additional
features include a low shutdown current of under 1µA and
thermal overload protection.
The LTC3539/LTC3539-2 are offered in a 2mm × 3mm ×
0.75mm DFN package.
Wide V
IN
, High Power 3.3V Regulator
n
Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells
n
Delivers 5V at 900mA From a Lithium-Polymer
Battery
n
V
IN
Start-Up Voltage: 700mV
n
1.5V to 5.25V V
OUT
Range
n
Up to 94% Efficiency
n
V
IN
> V
OUT
Operation
n
±1.5% Feedback Voltage Tolerance
n
1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed
Frequency Operation
n
Output Disconnect
n
Selectable Burst Mode
®
or PWM Operation
n
10µA Quiescent Current
n
Logic Controlled Shutdown: <1µA
n
Requires Only 6 External Components
n
Low Profile (2mm × 3mm × 0.75mm) DFN Package
n
Medical Instruments
n
Portable Bar Code Scanners
n
Noise Canceling Headphones
n
Portable GPS Navigation
n
Handheld PCs
L, LT , LT C , LT M and Burst Mode are registered trademarks and ThinSOT is a trademark of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
I
LOAD
AVERAGE (mA)
0.1 1 10 100 1000
0.1
1
10
100
1000
EFFICIENCY (%)
POWER LOSS (mW)
100
80
60
40
20
0
90
70
50
30
10
3539 TA01b
POWER LOSS
EFFICIENCY
V
IN
= 2.4V
V
OUT
= 3.3V
FREQUENCY = 1MHz
FREQUENCY = 2MHz
Efficiency and Power Loss vs Load Current
3539 TA01a
LTC3539
V
IN
SW
2.2µF
V
OUT
3.3V
600mA
V
IN
1.8V TO 3.6V
4.7µH
V
OUT
MODE
SHDN FB
PGND
GND
562k
1M
22µF
× 2
33pF
BURSTPWM
ONOFF
LTC3539/LTC3539-2
2
35392fc
For more information www.linear.com/3539/3539-2
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ................................................... –0.3V to 6V
SW Voltage
DC
............................................................ –0.3V to 6V
Pulsed <100ns
......................................... –0.3V to 7V
SHDN, FB, MODE Voltage ............................ –0.3V to 6V
V
OUT
............................................................. –0.3V to 6V
Operating Temperature (Notes 2, 5) .........–40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
(Note 1)
TOP VIEW
V
OUT
MODE
FB
SHDN
SW
PGND
GND
V
IN
DCB PACKAGE
8-LEAD (2mm × 3mm) PLASTIC DFN
9
3
4
2
1
6
5
7
8
T
JMAX
= 125°C, θ
JA
= 64°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range After Start-Up 0.5 5 V
Minimum Start-Up Voltage I
LOAD
= 1mA, V
OUT
= 0V 0.7 0.88 V
Output Voltage Adjust Range
l
1.5 5.25 V
Feedback Voltage
l
1.182 1.200 1.218 V
Feedback Input Current V
FB
= 1.2V 1 50 nA
Quiescent Current - Shutdown V
SHDN
= 0V, Not Including Switch Leakage, V
OUT
= 0V 0.01 1 µA
Quiescent Current - Active Measured on V
OUT
, Non-Switching 300 500 µA
Quiescent Current - Burst Measured on V
OUT
, FB > 1.230V 10 18 µA
N-Channel MOSFET Switch Leakage Current V
SW
= 5V 0.1 10 µA
P-Channel MOSFET Switch Leakage Current V
SW
= 5V, V
OUT
= 0V 0.1 20 µA
N-Channel MOSFET Switch On Resistance V
OUT
= 3.3V 0.09 Ω
P-Channel MOSFET Switch On Resistance V
OUT
= 3.3V 0.125 Ω
N-Channel MOSFET Current Limit
l
2 2.6 A
The l denotes the specifications which apply over the specified
temperature range of –40°C to 85°C, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
OUT
= 3.3V, unless otherwise noted.
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3539EDCB#PBF LTC3539EDCB#TRPBF LDCS 8-Lead (2mm × 3mm) Plastic DFN –40°C to 85°C
LTC3539EDCB-2#PBF LTC3539EDCB-2#TRPBF LDPH 8-Lead (2mm × 3mm) Plastic DFN –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C Marketing for information on non-standard lead based finish parts.
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/
LTC3539/LTC3539-2
3
35392fc
For more information www.linear.com/3539/3539-2
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3539E/LTC3539E-2 is guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle V
FB
= 1.15V
l
87 90 %
Minimum Duty Cycle V
FB
= 1.3V
l
0 %
Switching Frequency LTC3539
LTC3539-2
l
l
0.7
1.8
1
2
1.3
2.4
MHz
MHz
MODE Input High V
oltage 0.88 V
MODE Input Low Voltage 0.3 V
MODE Input Current V
MODE
= 1.2V 0.3 1 µA
SHDN Input High Voltage 0.88 V
SHDN Input Low Voltage 0.3 V
SHDN Input Current V
SHDN
= 1.2V
V
SHDN
= 3.3V
0.3
1
1
2
µA
µA
The l denotes the specifications which apply over the specified
temperature range of –40°C to 85°C, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
OUT
= 3.3V, unless otherwise noted.
Note 4: Current measurements are made when the output is not switching.
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 result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
64°C/W.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current and
V
IN
, V
OUT
= 1.8V
Efficiency vs Load Current and
V
IN
, V
OUT
= 3.3V
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
90
70
50
30
80
60
40
20
0
POWER LOSS (mW)
1000
100
10
1
0.1
0.01
3539 G01
V
IN
= 1V
V
IN
= 1.2V
V
IN
= 1.5V
POWER LOSS
EFFICIENCY
0.1 100 1000101
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
90
70
50
30
80
60
40
20
0
3539 G02
V
IN
= 1.2V
V
IN
= 1.8V
V
IN
= 3V
POWER LOSS
EFFICIENCY
0.1 100 1000101
0.1
1
10
100
1000
POWER LOSS (mW)
(T
A
= 25°C unless otherwise noted)
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC3539EDCB-2#TRMPBF

Mfr. #:
Buy LTC3539EDCB-2#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm x 3mm DFN Package
Lifecycle:
New from this manufacturer.
Delivery:
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