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LM2611
SNOS965J – JUNE 2001 – REVISED DECEMBER 2015
LM2611 1.4-MHz Cuk Converter
1 Features
3 Description
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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.
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: 0.5) and high load currents. The duty cycle begins to
increase beyond 50% as the input voltage drops below the absolute magnitude of the output voltage. RFB3 and
CFF2 are added to the feedback network to introduce a low frequency lag compensation (pole-zero pair)
necessary to stabilize the circuit under the combination of high duty cycle and high load currents.
9 Power Supply Recommendations
The power supply must never exceed the absolute maximum rating of the device given in Absolute Maximum
Ratings. If the regulator is connected to the input supply through long wires or PCB traces, special care is
required to achieve good performance. The parasitic inductance and resistance of the input cables can have an
adverse effect on the operation of the regulator. The parasitic inductance, in combination with the low ESR
ceramic input capacitors, can form an under-damped resonant circuit. This circuit may cause overvoltage
transients at the VIN pin, each time the input supply is cycled on and off.
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Copyright © 2001–2015, Texas Instruments Incorporated
Product Folder Links: LM2611
19
LM2611
SNOS965J – JUNE 2001 – REVISED DECEMBER 2015
www.ti.com
10 Layout
10.1 Layout Guidelines
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Connection between L1 and SW pin should be kept as short as possible to minimize inductance
Connection between CCUK and SW should also be kept short
The feedback resistor should be placed close to the NFB pin to minimize the path of the higher impedance
feedback node
The feedback trace leading from Vout to the output to the feedback resistors should not pass under the
switch node between L1 and CCUK and the switch node between CCUK, L2 and D
The feedback trace leading from Vout to the output to the feedback resistors should not pass under the
inductors L1 and L2
A bypass capacitor CBYP of 0.1 µF should be placed close to VIN and GND pin
10.2 Layout Example
Figure 36. Example Layout Top
Figure 37. Example Layout Bottom
20
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Copyright © 2001–2015, Texas Instruments Incorporated
Product Folder Links: LM2611
LM2611
www.ti.com
SNOS965J – JUNE 2001 – REVISED DECEMBER 2015
11 Device and Documentation Support
11.1 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.2 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.3 Electrostatic Discharge Caution
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.
11.4 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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Copyright © 2001–2015, Texas Instruments Incorporated
Product Folder Links: LM2611
21
PACKAGE OPTION ADDENDUM
www.ti.com
6-Aug-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
LM2611AMF
NRND
SOT-23
DBV
5
1000
Non-RoHS
& Green
Call TI
Level-1-260C-UNLIM
-40 to 125
S40A
LM2611AMF/NOPB
ACTIVE
SOT-23
DBV
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 125
S40A
Samples
LM2611AMFX/NOPB
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 125
S40A
Samples
LM2611BMF/NOPB
ACTIVE
SOT-23
DBV
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 125
S40B
Samples
LM2611BMFX/NOPB
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 125
S40B
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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