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PDF LT3427 Data sheet ( Hoja de datos )
| Número de pieza | LT3427 | |
| Descripción | 1.25MHz Synchronous Step-Up DC/DC Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 0.525Ω N-channel MOSFET switch
and a 0.575Ω P-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.
, LTC and LT 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
3427f
1
1 page  
PI FU CTIO S
VOUT (Pin 6): Output Voltage Sense Input and Drain of the
Internal Synchronous Rectifier MOSFET. Driver bias is
derived from VOUT. PCB trace length from VOUT to the
output filter capacitor(s) should be as short and wide as
possible.
LTC3427
www.DataSheet4U.com
Exposed Pad (Pin 7): Ground for the LTC3427. This pin
must be soldered to the PCB ground plane for electrical
connection and rated thermal performance.
BLOCK DIAGRA
VIN
1.8V TO 5V
+
CIN
2.2µF
L1
4.7µH
4
SHDN
3
VIN
SHUTDOWN
AND
VBIAS
VIN
SHDN
ANTIRING
PWM
LOGIC
AND
DRIVERS
1
SW
OPTIONAL
BULK CONTROL
SIGNALS
VOUT
6
CURRENT
SENSE
+–
IZERO
COMP
VOUT
1.8V TO 5.25V
PWM
COMP
+
Σ
ILIM +
REF
SLOPE COMPENSATION
REFERENCE
1.24V
1V
THERMAL
SHUTDOWN
GAIN ERROR
AMPLIFIER
+
–
R1
FB
5
1.24V
R2
START-UP
SOFT-START
COUT
4.7µF
EXPOSED PAD
7
OSCILLATOR
GND
2
3427 BD
3427f
5
5 Page 
PACKAGE DESCRIPTIO
DC Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
LTC3427
www.DataSheet4U.com
2.50 ±0.05
1.15
±0.05
0.61 ±0.05
(2 SIDES)
0.675 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
0.56 ± 0.05
(2 SIDES)
4
0.38 ± 0.05
6
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.200 REF
2.00 ±0.10
(4 SIDES)
0.75 ±0.05
0.00 – 0.05
PIN 1
CHAMFER OF
EXPOSED PAD
31
(DC6) DFN 1103
0.25 ± 0.05
0.50 BSC
1.37 ±0.05
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3427f
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT3427.PDF ] | |
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