LM3676 DC-DC Converter Datasheet

LM3676 Datasheet, PDF, Equivalent


Part Number

LM3676

Description

2-MHz 600-mA Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 27 Pages
Datasheet
Download LM3676 Datasheet


LM3676
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
1
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
VIN
2.9V to 5.5V
CIN
4.7 PF
VIN
8
L1: 2.2 PH
2 SW
PGND
NC
EN
LM3676
FB
14
SGND
67
5 3 MODE
VOUT
COUT
10 PF
Figure 1. Typical Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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 © 2006–2013, Texas Instruments Incorporated

LM3676
LM3676
SNVS426C – NOVEMBER 2006 – REVISED MAY 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
VIN
2.9V to 5.5V
CIN
4.7 PF
VIN
8
L1: 2.2 PH
2 SW
PGND
NC
LM3676-
ADJ 4
1
7
6
FB
SGND
C1
C2
EN 5
3 MODE
VOUT
COUT
R1 10 PF
R2
Figure 2. Typical Application Circuit for ADJ Version
PIN DIAGRAM
PGND
SW
MODE
FB
1
2
3
4
8 VIN
7 SGND
6 NC
5 EN
Pin No.
1
2
3
4
5
6
7
8
Name
PGND
SW
MODE
FB
EN
NC
SGND
VIN
Figure 3. Top View
WSON-8 Package
Package Number NGQ0008A
PIN DESCRIPTIONS (8-Lead WSON)
Description
Power Ground Pin.
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
Mode Control Pin: > 1.0V selects continuous PWM mode ; <0.4V selects Auto (PFM-PWM) mode. Do not
leave this pin floating.
Feedback analog input. Connect directly to the output filter capacitor for fixed voltage versions. For
adjustable version external resistor dividers are required (see Figure 2). The internal resistor dividers are
disabled for the adjustable version.
Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.0V.
Do not leave this pin floating.
Not Connected. Leave Pin Floating. Do Not Connect to other pins
Signal Ground Pin.
Power Supply input. Connect to the input filter capacitor (see Figure 1).
2 Submit Documentation Feedback
Product Folder Links: LM3676
Copyright © 2006–2013, Texas Instruments Incorporated


Features LM3676 www.ti.com SNVS426C – NOVEMBE R 2006 – REVISED MAY 2013 2-MHz 600- mA Step-Down DC-DC Converter With Mode Control Check for Samples: LM3676 FEAT URES 1 •2 16µA Typical Quiescent Cur rent • 600mA Maximum Load Capability • 2MHz Typical PWM Fixed Switching Fr equency • Automatic PFM/PWM Mode Swit ching or Forced PWM Mode • Available in Fixed Output Voltages and Adjustable Version • 8-Lead Non-Pullback WSON P ackage • Internal Synchronous Rectifi cation for High Efficiency • Internal Soft Start • 0.01µA Typical Shutdow n Current • Operates From a Single Li -Ion Cell Battery • Only Three Tiny S urface-Mount External Components Requir ed (One Inductor, Two Ceramic Capacitor s) • Current Overload and Thermal Shu tdown Protection APPLICATIONS • Mobil e Phones • PDAs • MP3 Players • W LAN • Portable Instruments • Digita l Still Cameras • Portable Hard Disk Drives DESCRIPTION The LM3676 step-dow n DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and inpu.
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