Cuk Converter. LM2611 Datasheet

LM2611 Converter. Datasheet pdf. Equivalent


Part LM2611
Description 1.4-MHz Cuk Converter
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LM2611 1.4MHz Cuk Converter January 2002 LM2611 1.4MHz Cuk LM2611 Datasheet
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LM2611
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LM2611
SNOS965J – JUNE 2001 – REVISED DECEMBER 2015
LM2611 1.4-MHz Cuk Converter
1 Features
1 1.4-MHz Switching Frequency
• Low RDS(ON) DMOS FET
• 1-mVp-p Output Ripple
5 V at 300 mA From 5-V Input
• Better Regulation Than a Charge Pump
• Uses Tiny Capacitors and Inductors
• Wide Input Range: 2.7 V to 14 V
• Low Shutdown Current: <1 µA
• 5-Pin SOT-23 Package
2 Applications
• MR Head Bias
• Digital Camera CCD Bias
• LCD Bias
• GaAs FET Bias
• Positive to Negative Conversion
3 Description
The LM2611 is a current mode, PWM inverting
switching regulator. Operating from a 2.7-V to 4-V
supply, it is capable of producing a regulated
negative output voltage of up to (36 VIN(MAX)). The
LM2611 utilizes an input and output inductor, which
enables low voltage ripple and RMS current on both
the input and the output. With a switching frequency
of 1.4 MHz, the inductors and output capacitor can be
physically small and low cost. High efficiency is
achieved through the use of a low RDS(ON) FET.
The LM2611 features a shutdown pin, which can be
activated when the part is not needed to lower the Iq
and save battery life. A negative feedback (NFB) pin
provides a simple method of setting the output
voltage, using just two resistors. Cycle-by-cycle
current limiting and internal compensation further
simplify the use of the LM2611.
The LM2611 is available as a small 5-pin, SOT-23
package and comes in two grades. Grade A has a
1.2-A current limit and 0.5-Ω RDS(ON), and Grade B
has a 0.9-A current limit and 0.7-Ω RDS(ON).
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2611
SOT-23 (5)
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
L1 CCUK
15 PH
1 PF
VIN
5V
L2
47 PH
VOUT - 5V
300 mA
CIN
22 PF
5
VIN
4
SHDN
1
SW
LM2611A NFB
RFB1
29.4k
3
GND
2
RFB2
10k
CFF
330 pF
D
COUT
22 PF
CIN: TAIYO YUDEN X5R JMK325BJ226MM
CCUK: TAIYO YUDEN X5R EMK316BJ105MF
COUT: TAIYO YUDEN X5R JMK325BJ226MM
D: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CR32-150
L2: SUMIDA CR32-470
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.



LM2611
LM2611
SNOS965J – JUNE 2001 – REVISED DECEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 ESD Ratings.............................................................. 3
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 4
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes........................................ 12
8 Application and Implementation ........................ 13
8.1 Application Information............................................ 13
8.2 Typical Application .................................................. 13
9 Power Supply Recommendations...................... 19
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 20
11 Device and Documentation Support ................. 21
11.1 Community Resources.......................................... 21
11.2 Trademarks ........................................................... 21
11.3 Electrostatic Discharge Caution ............................ 21
11.4 Glossary ................................................................ 21
12 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision I (April 2013) to Revision J
Page
• Added ESD Ratings 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 H (April 2013) to Revision I
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 19
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