LM2735
520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator
Overview
Diagrams
Parametrics
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Packaging
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Reliability
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Features
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170 mΩ NMOS switch
±2% feedback voltage accuracy
Ease-of-use, small total solution size Internal soft-start Internal compensation Two switching frequencies 520 kHz (LM2735-Y) 1.6 MHz (LM2735-X) Uses small surface mount inductors and chip capacitors Tiny SOT23-5, LLP-6, and eMSOP-8 packages
LM2735Q is AEC-Q100 Grade 1 qualified and is manufactured on an Automotive Grade Flow
Description
The LM2735 is an easy-to-use, space-efficient 2.1A low-side switch regulator ideal for Boost and SEPIC DC-DC regulation.
It provides all the active functions to provide local DC/DC conversion with fast-transient response and accurate regulation
in the smallest PCB area. Switching frequency is internally set to either 520kHz or 1.6MHz, allowing the use of extremely
small surface mount inductor and chip capacitors while providing efficiencies up to 90%. Current-mode control and internal
compensation provide ease-of-use, minimal component count, and high-performance regulation over a wide range of operating
conditions. External shutdown features an ultra-low standby current of 80 nA ideal for portable applications. Tiny SOT23-5,
LLP-6, and eMSOP-8 packages provide space-savings. Additional features include internal soft-start, circuitry to reduce inrush
current, pulse-by-pulse current limit, and thermal shutdown.
Applications
LCD Display Backlighting For Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Automotive
Parameters Values
Output Range
Vin to 24
Switch Current
2.25 Amp
Input Min Voltage
2.7 Volt
Input Max Voltage
5.5 Volt
Feedback Voltage
1.255 Volt
Frequency Max
1700, 550 kHz
Output Min
3 Volt
Output Max
24 Volt
Efficiency (peak)
90 %
Sync Pin
No
Adj Switch Frequency
No
Frequency Min
475, 1500 kHz
On/Off Pin
Yes
PowerGood / Error Flag
No
SoftStart
Yes
Special Features
12V LLP6 EXP DAP, LLP6 EXP DAP, eMSOP8 EXP DAP, SOT23-5, 12V eMSOP8 EXP DAP, 12V SOT23-5
Topology
Boost, Sepic, FlyBack
Step-Up
Yes
Flyback
Yes
RegType
Switching Regulator
AEC Q-100 Automotive Grade
1
Automotive
Yes
Quiescent Current
7, 3.4 mA
Datasheets
Application Notes
Other Technical Documents
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735SD3.3EVAL 520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X SEPIC 6-Pin LLP Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Applications:
LCD Display Backlighting for Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
A LM2735 Datasheet
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735XMFEVAL/NOPB 520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 5-Pin SOT23 Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Applications:
LCD Display Backlighting for Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
A LM2735 Datasheet
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735XMYEVAL 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 8-Pin eMSOP Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
LM2735 Datasheet
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735XSDEVAL 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 6-Pin LLP Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Applications:
LCD Display Backlighting for Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
LM2735 Datasheet
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735YMFEVAL 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 5-Pin SOT23 Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Applications:
LCD Display Backlighting for Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
LM2735 Datasheet
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735YMYEVAL 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 8-Pin eMSOP Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Applications:
LCD Display Backlighting for Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
LM2735 Datasheet
Part Number(s) Description Availability Current Reported Stock Budgetary Pricing Pack LM2735YSDEVAL 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 6-Pin LLP Demo Board Full production
$37.50 each 1 Features:
Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170Ωm NMOS switch
± 2% feedback voltage accuracy
Ease-of-use, small total solution size
Applications:
LCD Display Backlighting for Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Contents:
LM2735 Fully Assembled Evaluation Board
LM2735 Evaluation Board Appnote
LM2735 Datasheet
National Semiconductor follows the provisions of the Product Stewardship Guide for Customers
(
CSP-9-111C1 )
and Banned Substances and Materials of Interest Specification
(
CSP-9-111S2 )
for regulatory environmental compliance. Details may be found at:
www.national.com/en/packaging/greennopb.html .
Lead free products are RoHS compliant.
Lead Free product status is available through the search tool located
here
All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html .
Moisture Sensitivity Level Data for LM2735 .
A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html .
National's certificate of product compliance for LM2735 is located at RoHS Status .
CAD Symbols and Models
Models
Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2735XMF PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XMFX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XMY PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XMYX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XQMF PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XQMFX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XSD PVIP050 0 14280 0 0 1755000 3 497986041
LM2735XSDX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YMF PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YMFX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YMY PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YMYX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YQMF PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YQMFX PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YSD PVIP050 0 14280 0 0 1755000 3 497986041
LM2735YSDX PVIP050 0 14280 0 0 1755000 3 497986041
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click
here .
All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html .
Moisture Sensitivity Level Data for LM2735 .
A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html .
National's certificate of product compliance for LM2735 is located at RoHS Status .
Power for Portable Applications (Boost, Buck-Boost, & Integrated)
Power for Portable Applications (Boost, Buck-Boost, & Integrated)
[Information as of 9-Feb-2012] Copyright © 2011 National Semiconductor Corporation
