LM3668 DC-DC Converter Datasheet

LM3668 Datasheet, PDF, Equivalent


Part Number

LM3668

Description

High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
LM3668 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter
1 Features
1 45-µA Typical Quiescent Current
• For 2.8-V-3.3-V and 3-V-3.4-V Versions:
– 1-A Maximum Load Current for
VIN = 2.8 V to 5.5 V
– 800-mA Maximum Load Current for
VIN = 2.7 V
– 600-mA Maximum Load Current for
VIN = 2.5 V
• For 4.5 V-5 V
– 1-A Maximum Load Current for
VIN = 3.9 V to 5.5 V
– 800-mA Maximum Load Current for
VIN = 3.4 V to 3.8 V
– 700-mA Maximum Load Current for
VIN = 3 V to 3.3 V
– 600-mA Maximum Load Current for
VIN = 2.7 V to 2.9 V
• 2.2-MHz PWM Fixed Switching Frequency
(Typical)
• Automatic PFM-PWM Mode or Forced PWM
Mode
• Wide Input Voltage Range: 2.5 V to 5.5 V
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft Start: 600-µs Maximum Start-Up
Time After VIN Settled
• 0.01-µA Typical Shutdown Current
• Current Overload and Thermal Shutdown
Protection
• Frequency Sync Pin: 1.6 MHz to 2.7 MHz
Typical Application Circuit
VIN = 2.5V - 5.5V
C1
10 2F
2.2 2H
VDD
SW1
PVIN
VOUT
LM3668 FB
SW2 SYNC/MODE
EN VSEL
NC SGND PGND
L = 2.8V
H = 3.3V
2.8V/3.3V
C2
22 2F
2 Applications
• Handset Peripherals
• MP3 Players
• Pre-Regulation for Linear Regulators
• PDAs
• Portable Hard Disk Drives
• WiMax Modems
3 Description
The LM3668 is a synchronous buck-boost DC-DC
converter optimized for powering low voltage circuits
from a Li-Ion battery and input voltage rails between
2.5 V and 5.5 V. It has the capability to support up to
1-A output current over the output voltage range. The
LM3668 regulates the output voltage over the
complete input voltage range by automatically
switching between buck or boost modes depending
on the input voltage.
The LM3668 has 2 N-channel MOSFETS and 2 P-
channel MOSFETS arranged in a topology that
provides continuous operation through the buck and
boost operating modes. There is a MODE pin that
allows the user to choose between an intelligent
automatic PFM-PWM mode operation and forced
PWM operation. During PWM mode, a fixed-
frequency 2.2 MHz (typical) is used. PWM mode
drives load up to 1 A. Hysteretic PFM mode extends
the battery life through reduction of the quiescent
current to 45 µA (typical) at light loads during system
standby. Internal synchronous rectification provides
high efficiency. In shutdown mode (EN pin pulled
low), the device turns off and reduces battery
consumption to 0.01 µA (typical).
A high switching frequency of 2.2 MHz (typical)
allows the use of tiny surface-mount components
including a 2.2-µH inductor, a 10-µF input capacitor,
and a 22-µF output capacitor.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM3668
WSON (12)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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.

LM3668
LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 6
8 Detailed Description ............................................ 13
8.1 Overview ................................................................. 13
8.2 Functional Block Diagram ....................................... 14
8.3 Feature Description................................................. 14
8.4 Device Functional Modes........................................ 16
9 Application and Implementation ........................ 19
9.1 Application Information............................................ 19
9.2 Typical Application .................................................. 19
10 Power Supply Recommendations ..................... 23
11 Layout................................................................... 23
11.1 Layout Guidelines ................................................. 23
11.2 Layout Example .................................................... 23
12 Device and Documentation Support ................. 24
12.1 Device Support...................................................... 24
12.2 Trademarks ........................................................... 24
12.3 Electrostatic Discharge Caution ............................ 24
12.4 Glossary ................................................................ 24
13 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision N (August 2014) to Revision O
Page
• Changed RθJA value from 34 to 47.3; change 20 PINS to 12 PINS in header; add additional thermal information............... 5
Changes from Revision M (May 2013) to Revision N
Page
• Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device
Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section ................................................................................................................................................................................... 1
Changes from Revision L (April 2013) to Revision M
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 23
2 Submit Documentation Feedback
Product Folder Links: LM3668
Copyright © 2007–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3668 SNVS449O – JUNE 200 7 – REVISED APRIL 2015 LM3668 1-A, Hi gh-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter 1 Features •1 45-µA Typical Quiescent Current • For 2.8-V-3.3-V and 3-V-3.4-V Versi ons: – 1-A Maximum Load Current for V IN = 2.8 V to 5.5 V – 800-mA Maximum Load Current for VIN = 2.7 V – 600-mA Maximum Load Current for VIN = 2.5 V For 4.5 V-5 V – 1-A Maximum Load C urrent for VIN = 3.9 V to 5.5 V – 800 -mA Maximum Load Current for VIN = 3.4 V to 3.8 V – 700-mA Maximum Load Curr ent for VIN = 3 V to 3.3 V – 600-mA M aximum Load Current for VIN = 2.7 V to 2.9 V • 2.2-MHz PWM Fixed Switching F requency (Typical) • Automatic PFM-PW M Mode or Forced PWM Mode • Wide Inpu t Voltage Range: 2.5 V to 5.5 V • Int ernal Synchronous Rectification for Hig h Efficiency • Internal Soft Start: 6 00-µs Maximum Start-Up Time After VIN Settled • 0.01-µA Typical Shutdown Current • Current Overloa.
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