LM3674_15 Datasheet, PDF (1/26 Pages) Texas Instruments – LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23

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LM3674
SNVS405G – DECEMBER 2005 – REVISED APRIL 2015
LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23
1 Features
•1 Input Voltage Range From 2.7 V to 5.5 V
• 600-mA Maximum Load Current
• Available in Fixed and Adjustable Output Voltages
Ranging From 1 V to 3.3 V
• 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 (typical)
• Current Overload Protection and Thermal
Shutdown Protection
2 Applications
• Mobile Phones
• PDAs
• MP3 Players
• Portable Instruments
• W-LAN
• Digital Still Cameras
• Portable Hard Disk Drives
3 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
2.7 V to 5.5 V. It provides up to 600-mA 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 the Pulse Width Modulation (PWM) mode, the
device operates at a fixed-frequency of 2 MHz
(typical). Internal synchronous rectification provides
high efficiency during the PWM mode operation. In
shutdown mode, the device turns off and reduces
battery consumption to 0.01 µA (typical).
The LM3674 is available in a 5-pin SOT-23 package.
A high switching frequency of 2 MHz (typical) allows
use of only three tiny external surface-mount
components, an inductor and two ceramic capacitors.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3674
SOT-23 (5)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
V_IN
2.7V to 5.5V
C_IN
4.7 2F
V_IN
1
L1:2.2 2H
SW
5
LM3674
GND
2
EN
3
FB
4
V_OUT
C_OUT
10 2F
Typical Application Circuit for Adjustable Voltage
Option
VIN
2.7V to 5.5V
CIN: 4.7 2F
VIN
1
L1: 2.2 2H
SW
5
LM3674-
GND
ADJ
2
C1
R1
EN
3
FB
4
VOUT
COUT: 10 2F
C2
R2
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.