LM3671MF-ADJ+ National Semiconductor, LM3671MF-ADJ+ Datasheet
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LM3671MF-ADJ+
Manufacturer Part Number
LM3671MF-ADJ+
Description
Manufacturer
National Semiconductor
Specifications of LM3671MF-ADJ+
Notes
NEW
Date_code
10+
© 2006 National Semiconductor Corporation
LM3671
2MHz, 600mA Step-Down DC-DC Converter in SOT23-5
and 5-Bump Micro SMD
General 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
600mA load current, over the entire input voltage range.
There are several different fixed voltage output options avail-
able 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 in-
telligent 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 re-
ducing 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).
The LM3671 is available in SOT23-5 and a tiny 5-bump
micro SMD packages in leaded (PB) and lead-free (NO PB)
versions. 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.
Typical Application Circuits
DS201084
FIGURE 1. Typical Application Circuit
Features
n 16 µA typical quiescent current
n 600 mA maximum load capability
n 2 MHz PWM fixed switching frequency (typ)
n Automatic PFM/PWM mode switching
n Available in fixed output voltages and adjustable version
n SOT23-5 and 5-bump micro SMD packages
n Internal synchronous rectification for high efficiency
n Internal soft start
n 0.01 µA typical shutdown current
n Operates from a single Li-Ion cell battery
n Only three tiny surface-mount external components
n Current overload and Thermal shutdown protection
Applications
n Mobile phones
n PDAs
n MP3 players
n W-LAN
n Portable instruments
n Digital still cameras
n Portable Hard disk drives
required (one inductor, two ceramic capacitors)
20108401
September 2006
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