LM3674 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

LM3674
www.ti.com
SNVS405F – DECEMBER 2005 – REVISED MAY 2013
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT-23
Check for Samples: LM3674
FEATURES
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•2 600mA Max Load Current
• Input Voltage Range from 2.7V to 5.5V
• Available in Fixed and Adjustable Output
Voltages Ranging from 1.0V to 3.3V
• Operates from a Single Li-Ion Cell Battery
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft Start
• 0.01 µA Typical Shutdown Current
• 2 MHz PWM Fixed Switching Frequency (typ)
• 5-Pin SOT-23 Package
• Current Overload Protection and Thermal
Shutdown Protection
APPLICATIONS
• Mobile Phones
• PDAs
• MP3 Players
• Portable Instruments
• W-LAN
• Digital Still Cameras
• Portable Hard Disk Drives
DESCRIPTION
The LM3674 step-down DC-DC converter is
optimized for powering low voltage circuits from a
single Li-Ion cell battery and input voltage rails from
2.7V to 5.5V. It provides up to 600mA load current,
over the entire input voltage range. There are several
fixed output voltages and adjustable output voltage
versions.
The device offers superior features and performance
for mobile phones and similar portable systems.
During PWM mode, the device operates at a fixed-
frequency of 2 MHz (typ). Internal synchronous
rectification provides high efficiency during Pulse
Width Modulation (PWM) mode operation. In
shutdown mode, the device turns off and reduces
battery consumption to 0.01 µA (typ).
The LM3674 is available in a 5-pin SOT-23 package
in leaded (PB) and lead-free (NO PB) versions. A
high switching frequency of 2 MHz (typ) allows use of
only three tiny external surface-mount components,
an inductor and two ceramic capacitors.
TYPICAL APPLICATION CIRCUITS
V_IN
2.7V to 5.5V
C_IN
4.7 PF
V_IN
1
L1:2.2 PH
SW
5
LM3674
GND
2
V_OUT
C_OUT
10 PF
EN
3
FB
4
Figure 1. Typical Application Circuit
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2
PRODUCTION DATA information is current as of publication date.
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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