LM3674_14 Datasheet, PDF (1/22 Pages) Texas Instruments – 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

LM3674
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SNVS405E – DECEMBER 2005 – REVISED SEPTEMBER 2006
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5
Check for Samples: LM3674
FEATURES
1
•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)
• SOT23-5 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 PWM mode operation. In shutdown mode, the device turns off and reduces battery
consumption to 0.01 µA (typ).
The LM3674 is available in SOT23-5 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
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.
Copyright © 2005–2006, Texas Instruments Incorporated