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Linear Technology Electronic Components Datasheet

LTC3539EDCB-2 Datasheet

1MHz/2MHz Synchronous Step-Up DC/DC Converters

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LTC3539/LTC3539-2
2A, 1MHz/2MHz
Synchronous Step-Up
DC/DC Converters
FEATURES
n Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells
n Delivers 5V at 900mA From a Lithium-Polymer
Battery
n VIN Start-Up Voltage: 700mV
n 1.5V to 5.25V VOUT Range
n Up to 94% Efficiency
n VIN > VOUT 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
APPLICATIONS
n Medical Instruments
n Portable Bar Code Scanners
n Noise Canceling Headphones
n Portable GPS Navigation
n Handheld PCs
DESCRIPTION
The LTC®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.
L, LT, LTC, LTM 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.
TYPICAL APPLICATION
Wide VIN, High Power 3.3V Regulator
Efficiency and Power Loss vs Load Current
VIN
1.8V TO 3.6V
2.2µF
PWM BURST
4.7µH
VIN
SW
LTC3539
MODE
VOUT
OFF ON
SHDN
GND
FB
PGND
1M
562k
33pF
VOUT
3.3V
600mA
22µF
×2
3539 TA01a
100
1000
90
80
EFFICIENCY
100
70
60
50
VIN = 2.4V
VOUT = 3.3V
40
30
20
10
POWER LOSS
1
10
0
0.1
FREQUENCY = 1MHz
FREQUENCY = 2MHz
0.1
1
10
100
1000
ILOAD AVERAGE (mA)
3539 TA01b
For more information www.linear.com/3539/3539-2
35392fc
1


Linear Technology Electronic Components Datasheet

LTC3539EDCB-2 Datasheet

1MHz/2MHz Synchronous Step-Up DC/DC Converters

No Preview Available !

LTC3539/LTC3539-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN 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
VOUT.............................................................. –0.3V to 6V
Operating Temperature (Notes 2, 5)..........–40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
SW 1
8 VOUT
PGND 2
7 MODE
9
GND 3
6 FB
VIN 4
5 SHDN
DCB PACKAGE
8-LEAD (2mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 64°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3539EDCB#PBF
LTC3539EDCB#TRPBF LDCS
8-Lead (2mm × 3mm) Plastic DFN
LTC3539EDCB-2#PBF
LTC3539EDCB-2#TRPBF LDPH
8-Lead (2mm × 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC 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/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
temperature range of –40°C to 85°C, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
After Start-Up
0.5
5
V
Minimum Start-Up Voltage
Output Voltage Adjust Range
ILOAD = 1mA, VOUT = 0V
0.7
0.88
V
l 1.5
5.25
V
Feedback Voltage
l 1.182 1.200 1.218
V
Feedback Input Current
VFB = 1.2V
1
50
nA
Quiescent Current - Shutdown
VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V
0.01
1
µA
Quiescent Current - Active
Measured on VOUT, Non-Switching
300
500
µA
Quiescent Current - Burst
Measured on VOUT, FB > 1.230V
10
18
µA
N-Channel MOSFET Switch Leakage Current VSW = 5V
0.1
10
µA
P-Channel MOSFET Switch Leakage Current VSW = 5V, VOUT = 0V
0.1
20
µA
N-Channel MOSFET Switch On Resistance VOUT = 3.3V
0.09
Ω
P-Channel MOSFET Switch On Resistance VOUT = 3.3V
0.125
Ω
N-Channel MOSFET Current Limit
l
2
2.6
A
35392fc
2
For more information www.linear.com/3539/3539-2


Part Number LTC3539EDCB-2
Description 1MHz/2MHz Synchronous Step-Up DC/DC Converters
Maker Linear
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