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參數(shù)資料
| 型號(hào)： | LTC3427EDC#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, LEAD FREE, PLSTIC, DFN-6 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 202K |
| 代理商： | LTC3427EDC#PBF |
1
LTC3427
3427fa
■ Handheld Instruments
■ Digital Cameras
■
Wireless Handsets
■ GPS Receivers
■ Portable Medical Devices
■
MP3 Players
2-Cell Alkaline to 3.3V Synchronous Boost Converter
500mA, 1.25MHz
Synchronous Step-Up
DC/DC Converter in
2mm
× 2mm DFN Package
■ 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 (<1
A)
■ Anti-Ringing Control Minimizes EMI
■ Tiny External Components
■ Short-Circuit Protection
■ Low Profile (0.75mm
× 2mm × 2mm) DFN Package
2.4V to 3.3V Efficiency
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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 0.525
N-channel MOSFET switch
and a 0.575
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 1
A and thermal shutdown.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LOAD CURRENT (mA)
10
70
EFFICIENCY
(%)
POWER
LOSS
(mW)
75
80
85
90
100
10
100
1000
100
1000
3427 TA01b
95
EFFICIENCY
POWER LOSS
VIN
2.2
F
2-CELL
ALKALINE
VIN
1.8V TO 3.2V
SHDN
GND
1000k
604k
4.7
F
3427 TA01a
VOUT
3.3V
200mA
SW
OFF ON
LTC3427
4.7
H
VOUT
FB
+
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