Datasheet 搜索 > DC/DC转换器 > TI（德州仪器） > LM3678SDE-1.2/NOPB 数据手册 > LM3678SDE-1.2/NOPB 其他数据使用手册 1/18 页
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LM3678SDE-1.2/NOPB 其他数据使用手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
DC/DC转换器
封装:
WSON-10
描述:
Step-Down DC/DC Converters (Integrated Switch) up to 6V Input Max., LM Series, Texas Instruments### 直流/直流开关调节器转换器（集成开关），Texas InstrumentsTexas Instruments 的此系列高度集成的高效开关稳压器包括步升（升压）、步降（降压）、步升/降（增压/降压）和反相类型，为每个直流稳压器应用提供高效的解决方案。
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LM3678SDE-1.2/NOPB数据手册
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LOAD (A)
EFFICIENCY (%)
90
80
70
60
50
40
30
20
10
0
0.010 0.100 1.000 10.000
V
IN
= 3.6V
V
IN
= 4.5V
V
IN
= 5.5V
V
IN
= 2.5V, 2.7V
1 PH
LM3678
V
IN
= 2.5V to 5.5V
PWM
GND
SW
VDD
FB
EN
CIN
10 PF
V
OUT
GND
VDD
VSELECT
PGOOD
C
OUT
22 PF
0.8V/1.2V
LM3678
www.ti.com
SNVS464C –APRIL 2008–REVISED MAY 2013
High-Performance Miniature 1.5-A Step-Down DC-DC Converter for Handheld Applications
Check for Samples: LM3678
1
FEATURES
DESCRIPTION
The LM3678 step-down DC-DC converter is
2
• V
OUT
= 0.8 V or 1.2 V
optimized for powering low-voltage circuits from a
• V
IN
= 2.5 V to 5.5 V
single Li-Ion cell battery and input voltage rails from
• 1.5-A Maximum Load Capability
2.5 V to 5.5 V. It provides up to 1.5-A load current,
over the entire input voltage range. LM3678 offers a
• 3.3-MHz (Typical) PWM Fixed Switching
0.8V or 1.2V option. One of the pair of voltages is set
Frequency Allows Use of 1-µH Inductor
through the VSELECT pin.
• ±3% DC Output Voltage Precision
LM3678 operates in PWM mode with a fixed
• 0.01-µA (Typical) Shutdown Current
frequency of 3.3 MHz. Internal synchronous
• Internal Synchronous Rectification for High
rectification provides high efficiency during PWM
Efficiency
mode operation. In shutdown mode, the device turns
off and reduces battery consumption to 0.01 µA
• Internal Soft Start
(typical).
• Current Overload and Thermal Shutdown
Protection
The LM3678 is available in a 3mm x 3mm DSC-10
package. A high switching frequency of 3.3 MHz
(typical) allows use of tiny surface-mount
APPLICATIONS
components. Only three external surface-mount
• PDAs and Smart Phones
components, an inductor and two ceramic capacitors,
• Personal Media Players
are required (solution size less than 33 mm
2
). For
voltages other than the voltage shown, contact TI or
• W-LAN
your distributor.
• USB Modem Applications
• Digital Still Cameras
• Portable Hard Disk Drives
Efficiency vs. Output Current
Typical Application Circuit ( V
OUT
= 1.2V)
NOTE: V
SEL
H = 1.2V, V
SEL
L = 0.8V
Figure 1. Figure 2.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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