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参数资料
| 型号： | LTC3443EDE#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 12DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 12-DFN（4x3） |
LTC3443
High Current Micropower
600kHz Synchronous Buck-Boost
DC/DC Converter
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
■
■
■
Regulated Output with Input Above, Below or Equal
to the Output
Single Inductor, No Schottky Diodes
High Efficiency: Up to 96%
28 μ A Quiescent Current in Burst Mode ? Operation
Up to 1.2A Continuous Output Current from a Single
Lithium-Ion
True Output Disconnect in Shutdown
2.4V to 5.5V Input Range
2.4V to 5.25V Output Range
600kHz Fixed Frequency Operation
Synchronizable Oscillator
Selectable Burst Mode or Fixed Frequency Operation
<1 μ A Quiescent Current in Shutdown
Small, Thermally Enhanced 12-Lead
(4mm × 3mm × 0.8mm) DFN package
The LTC ? 3443 is a high efficiency, fixed frequency, buck-
boost DC/DC converter that operates from input voltages
above, below or equal to the output voltage. The part is pin
for pin compatible with its predecessor, the LTC3441, with
a lower operating frequency (600kHz), and a V C pin clamp
circuit during Burst Mode operation. The topology incor-
porated in the IC provides a continuous transfer function
through all operating modes, making the product ideal for
single Lithium Ion or multicell applications where the out-
put voltage is within the battery voltage range.
The device includes two 0.10 Ω N-channel MOSFET
switches and two 0.11 Ω P-channel switches. External
Schottky diodes are optional, and can be used for a
moderate efficiency improvement. The operating frequency
is internally set to 600kHz and can be synchronized up to
1.2MHz. Quiescent current is only 28 μ A in Burst Mode
operation, maximizing battery life in portable applications.
APPLICATIO S
■ Handheld Computers
■ Handheld Instruments
■ MP3 Players
■ Digital Cameras
, LT, LTC and LTM 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.
U.S. Patent #’s 6404251, 6166527
TYPICAL APPLICATIO
Li-Ion to 3.3V at 1A Buck-Boost Converter
Burst Mode operation is user controlled and can be
enabled by driving the MODE/SYNC pin high. If the MODE/
SYNC pin is driven low or with a clock, then fixed fre-
quency switching is enabled.
Other features include a 1 μ A shutdown, soft-start control,
thermal shutdown and current limit. The LTC3443 is
available in a thermally enhanced 12-lead (4mm × 3mm)
DFN Package.
Efficiency vs V IN
6 μ H
V OUT
3.3V
100
95
I OUT = 200mA
V IN
2.5V
TO 4.2V
Li-Ion
10 μ F
SW1 SW2
PV IN V OUT
LTC3443
V IN FB
SHDN/SS V C
MODE/SYNC GND
PGND PGND
15k
560pF
340k
200k
220pF
2.2k
1A
44 μ F
(2 × 22 μ F)
90
85
80
75
70
65
I OUT = 1A
60
3443 TA01
55
50
V OUT = 3.3V
2.7
3.2
3.7
4.2
4.7
5.2
V IN (V)
3443 TA02
3443fa
1
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