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Linear Technology Electronic Components Datasheet

LTC3427EDC Datasheet

500mA 1.25MHz Synchronous Step-Up DC/DC Converter

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FEATURES
High Efficiency: Up to 94%
3.3V at 200mA from Two Alkaline Cells
5V at 200mA from a Single Li-Ion Cell
Inrush Current Limiting and Soft-Start
Output Disconnect in Shutdown
1.8V to 5V VIN Range
1.8V to 5.25V VOUT Range
1.25MHz Fixed Frequency, Low Noise PWM
Internal Synchronous Rectifier
Logic Controlled Shutdown (<1µA)
Anti-Ringing Control Minimizes EMI
Tiny External Components
Short-Circuit Protection
Low Profile (0.75mm × 2mm × 2mm) DFN Package
U
APPLICATIO S
Handheld Instruments
Digital Cameras
Wireless Handsets
GPS Receivers
Portable Medical Devices
MP3 Players
LTC3427 www.DataSheet4U.com
500mA, 1.25MHz
Synchronous Step-Up
DC/DC Converter in
2mm × 2mm DFN Package
DESCRIPTIO
The LTC®3427 is the industry’s first high efficiency, fixed
frequency, step-up DC/DC converter with true output
disconnect in a 6-lead 2mm × 2mm DFN package. Requir-
ing minimal external components, the LTC3427 operates
from an input voltage as low as 1.8V. The LTC3427
contains an internal 0.525N-channel MOSFET switch
and a 0.575P-channel MOSFET synchronous rectifier,
which enables it to supply 200mA at 3.3V from a 2-cell
alkaline battery input.
The LTC3427 limits inrush current during start-up and
provides a soft-start of VOUT. A switching frequency of
1.25MHz minimizes solution footprint by allowing the use
of tiny, low profile inductors and ceramic capacitors and
produces very low VOUT ripple. The current mode PWM
design is internally compensated, reducing external parts
count. Anti-ringing control reduces EMI in discontinuous
mode operation. The LTC3427 also features low shut-
down current of under 1µA and thermal shutdown.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
2-Cell Alkaline to 3.3V Synchronous Boost Converter
VIN
1.8V TO 3.2V 2-CELL +
ALKALINE
2.2µF
OFF ON
4.7µH
VIN
SW
LTC3427
SHDN VOUT
GND
FB
1000k
604k
VOUT
3.3V
200mA
4.7µF
3427 TA01a
100
95
90
85
80
75
70
10
2.4V to 3.3V Efficiency
1000
EFFICIENCY
100
POWER LOSS
100
LOAD CURRENT (mA)
10
1000
3427 TA01b
3427fa
1


Linear Technology Electronic Components Datasheet

LTC3427EDC Datasheet

500mA 1.25MHz Synchronous Step-Up DC/DC Converter

No Preview Available !

LTC3427
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, VOUT Voltages ...................................... – 0.3V to 6V
SHDN, FB Voltages ..................................... – 0.3V to 6V
SW Voltage
DC .......................................................... – 0.3V to 6V
Pulsed < 100ns ...................................... – 0.3V to 7V
Operating Temperature Range
(Notes 2, 5) ............................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 125°C
www.DataSheet4U.com
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
654
7
123
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 60°C/W TO 85°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DC PART MARKING
LTC3427EDC
LBSY
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 2.4V, VOUT = 3.3V unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX
Minimum Start-Up Voltage
ILOAD < 1mA
1.6
1.8
Output Voltage Adjust Range
1.8
5.25
Feedback Voltage
1.215 1.24 1.265
Feedback Input Current
Quiescent Current—Shutdown
Quiescent Current—Active
VFB = 1.24V
VSHDN = 0V, VOUT = 0V
VFB = 1.5V (Note 3)
1
50
0.01
1
350 550
NMOS Switch Leakage
0.1
5
PMOS Switch Leakage
0.1
5
NMOS Switch-On Resistance
0.525
PMOS Switch-On Resistance
0.575
NMOS Current Limit
500
Current Limit Delay to Output
(Note 4)
40
Maximum Duty Cycle
Minimum Duty Cycle
VFB = 1V
VFB = 1.5V
80
87
0
Frequency
0.9
1.25
1.5
SHDN Input High
1
SHDN Input Low
0.35
SHDN Input Current
VSHDN = 5.5V
0.01
1
Soft-Start Time
2
UNITS
V
V
V
nA
µA
µA
µA
µA
mA
ns
%
%
MHz
V
V
µA
ms
3427fa
2


Part Number LTC3427EDC
Description 500mA 1.25MHz Synchronous Step-Up DC/DC Converter
Maker Linear
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