LM3671_15 Datasheet, PDF (1/36 Pages) Texas Instruments – LM3671/-Q1 2-MHz, 600-mA Step-Down DC-DC Converter6

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LM3671, LM3671-Q1
SNVS294R – NOVEMBER 2004 – REVISED NOVEMBER 2014
LM3671/-Q1 2-MHz, 600-mA Step-Down DC-DC Converter
1 Features
•1 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
• LM3671-Q1 is an AEC-Q100 Grade 1 Qualified
Automotive Grade Product
2 Applications
• Mobile Phones
• PDAs
• MP3 Players
• W-LAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
• Automotive
3 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
2.7 V to 5.5 V. 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
1.1 V to 3.3 V.
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.).
A high-switching frequency of 2 MHz (typ.) allows use
of tiny surface-mount components. Only three
external surface-mount components, an inductor, and
two ceramic capacitors, are required.
Device Information⁽¹⁾
PART NUMBER PACKAGE BODY SIZE
LM3671
USON (6) 2.00 mm x 2.00 mm (NOM)
LM3671
LM3671-Q1
SOT-23 (5)
DSBGA (5)
2.90 mm x 1.60 mm (NOM)
1.413 mm x 1.083 mm (MAX)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Circuit: Fixed-Voltage
V_IN
2.7V to 5.5V
C_IN
4.7 2F
V_IN
1
5
LM3671
GND
2
L1: 2.2 2H
SW
V_OUT
C_OUT
10 2F
EN
3
FB
4
Typical Application Circuit: ADJ
V_IN
2.7V to 5.5V
C_IN
4.7 2F
V_IN
1
5
LM3671-
GND
ADJ
2
L1: 2.2 2H
SW
C1
EN
3
C2
FB
4
V_OUT
C_OUT
R1
10 2F
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.