LM3671 Datasheet, PDF (1/39 Pages) National Semiconductor (TI) – 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5

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LM3671
LM3671Q
SNVS294P – NOVEMBER 2004 – REVISED MAY 2013
LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter
Check for Samples: LM3671, LM3671Q
FEATURES
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•2 16 µA Typical Quiescent Current
• 600 mA Maximum Load Capability
• 2 MHz PWM Fixed Switching Frequency (typ.)
• Automatic PFM/PWM Mode Switching
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft start
• 0.01 µA Typical Shutdown Current
• Operates from a Single Li-Ion Cell Battery
• Only Three Tiny Surface-Mount External
Components Required (One Inductor, Two
Ceramic Capacitors)
• Current Overload and Thermal Shutdown
Protection
• Available in Fixed Output Voltages and
Adjustable Version
• LM3671Q is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified
• SOT-23, 5-Bump DSBGA and 6-Pin USON
Packages
APPLICATIONS
• Mobile Phones
• PDAs
• MP3 Players
• W-LAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
• Automotive
DESCRIPTION
The LM3671 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 600 mA load current,
over the entire input voltage range. There are several
different fixed voltage output options available as well
as an adjustable output voltage version range from
1.1V to 3.3V.
The device offers superior features and performance
for mobile phones and similar portable systems.
Automatic intelligent switching between PWM low-
noise and PFM low-current mode offers improved
system control. During PWM mode, the device
operates at a fixed-frequency of 2 MHz (typ.).
Hysteretic PFM mode extends the battery life by
reducing the quiescent current to 16 µA (typ.) during
light load and standby operation. Internal
synchronous rectification provides high efficiency
during PWM mode operation. In shutdown mode, the
device turns off and reduces battery consumption to
0.01 µA (typ.).
TYPICAL APPLICATION CIRCUITS
V_IN
2.7V to 5.5V
C_IN
4.7 PF
V_IN
1
5
LM3671
GND
2
L1: 2.2 PH
SW
V_OUT
C_OUT
10 PF
EN
3
FB
4
Figure 1. Typical Application Circuit
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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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