LM3676_15 Datasheet, PDF (1/25 Pages) Texas Instruments – 2-MHz 600-mA Step-Down DC-DC Converter With Mode Control

LM3676
www.ti.com
SNVS426C – NOVEMBER 2006 – REVISED MAY 2013
2-MHz 600-mA Step-Down DC-DC Converter With Mode Control
Check for Samples: LM3676
FEATURES
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•2 16µA Typical Quiescent Current
• 600mA Maximum Load Capability
• 2MHz Typical PWM Fixed Switching Frequency
• Automatic PFM/PWM Mode Switching or
Forced PWM Mode
• Available in Fixed Output Voltages and
Adjustable Version
• 8-Lead Non-Pullback WSON Package
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft Start
• 0.01µA 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
APPLICATIONS
• Mobile Phones
• PDAs
• MP3 Players
• WLAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
DESCRIPTION
The LM3676 step-down DC-DC converter is
optimized for powering low voltage circuits from a
single Li-Ion cell battery and input voltage rails from
2.9V to 5.5V. It provides up to 600mA 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.
The LM3676 has a mode-control pin that allows the
user to select continuous Pulse Width Modulation
(PWM) mode over the complete load range or an
intelligent PFM-PWM mode that changes modes
depending on the load. PWM mode offers superior
efficiency under high load conditions (>100mA) and
the lowest output noise performance. In Auto mode,
PFM-PWM, hysteretic PFM extends the battery life
through reduction of the quiescent current to 16µA
(typ.) during light loads and system standby.
The LM3676 is available in a 8-lead non-pullback
WSON package in leaded (PB) and lead-free (NO
PB) versions. A high switching frequency of 2 MHz
(typ) allows use of tiny surface-mount components,
an inductor and two ceramic capacitors.
TYPICAL APPLICATION CIRCUITS
V_IN
2.9V to 5.5V
C_IN
4.7 PF
V_IN
8
L1: 2.2 PH
2 ^SW
PGND
NC
EN
LM3676
FB
1
4
SGND
6
7
5
3 ^MODE
V_OUT
C_OUT
10 PF
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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