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參數(shù)資料
| 型號(hào)： | 3442 |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation |
| 中文描述： | 微功率同步降壓升壓與自動(dòng)突發(fā)模式的DC / DC轉(zhuǎn)換器操作 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 332K |
| 代理商： | 3442 |
LTC3442
1
3442f
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Burst Mode is a registered
trademark of Linear Technology Corporation. Protected by U.S. Patents including 6404251,
6166527.
SW1
V
IN
SHDN/SS
R
LIM
R
T
SGND
SW2
V
OUT
FB
V
C
BURST
PGND
LTC3442
10
μ
F
0.01
μ
F
V
IN
2.5V TO
4.2V
Li-Ion
340k
2.2k
22
μ
F
220pF
V
3.3V
1.2A
200k
0.01
μ
F
15k
470pF
3442 TA01a
4.7
μ
H
1M
71.5k
200k
TYPICAL APPLICATIO
U
APPLICATIU
FEATURES
DESCRIPTIOU
The LTC
3442 is a highly efficient, fixed frequency, Buck-
Boost DC/DC converter, which operates from input volt-
ages above, below, and equal to the output voltage. The
topology incorporated in the IC provides a continuous
transfer function through all operating modes, making the
product ideal for a single Lithium-Ion or multicell alkaline
applications where the output voltage is within the battery
voltage range.
The device includes two 0.10
N-channel MOSFET
switches and two 0.10
P-channel switches. Operating
frequency and average input current limit can each be
programmed with an external resistor. Quiescent current
is only 35
μ
A in Burst Mode operation, maximizing battery
life in portable applications. Automatic Burst Mode opera-
tion allows the user to program the load current for Burst
Mode operation, or to control it manually.
Other features include 1
μ
A shutdown current, program-
mable soft-start, peak current limit and thermal shutdown.
The LTC3442 is available in a low profile, thermally en-
hanced 12-lead (4mm
×
3mm
×
0.75mm) DFN package.
Micropower Synchronous
Buck-Boost DC/DC Converter with
Automatic Burst Mode Operation
■
PDA/‘SMART’ Phones
■
Handheld Computers
■
MP3 Players
■
Handheld Instruments
■
Digital Cameras
■
Wireless Handsets
■
USB Peripherals
Efficiency vs V
IN
V
IN
(V)
2.5
E
100
90
80
70
60
50
3.0
3.5
4.0
4.5
3442 TA01b
5.0
5.5
1A LOAD
300mA LOAD
V
= 3.3V
L = 4.7
H
F = 600kHz
■
Regulated Output with Input Voltages Above,
Below, or Equal to the Output
■
Single Inductor, No Schottky Diodes Required
■
Manual or Programmable Automatic Burst Mode
Operation
■
Programmable Average Input Current Limit
■
Up to 1.2A Continuous Output Current from a Single
Lithium-Ion Cell
■
High Efficiency: Up to 95%
■
Output Disconnect in Shutdown
■
2.4V to 5.5V Input Range
■
2.4V to 5.25V Output Range
■
35
μ
A Quiescent Current in Burst Mode Operation
■
Programmable Frequency from 300kHz to 2MHz
■
<1
μ
A Shutdown Current
■
Small, Thermally Enhanced 12-Lead (4mm
×
3mm)
DFN Package
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