LM26420 - Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Knowledge Base

Features


Input voltage range of 3.0V to 5.5V
Output voltage range of 0.8V to 4.5V
2.0A output current per output
High Switching Frequencies
 2.2MHz (LM26420X)
 0.55MHz (LM26420Y)
75mΩ PMOS switch
50mΩ NMOS switch
0.8V, 1.5% Internal Voltage Reference
Internal soft-start
Independent power good for each output
Independent precision enable for each output
Current mode, PWM operation
Thermal Shutdown
Over voltage protection
Start-up into Pre-biased Output Loads
Outputs are 180° out of phase

General Description


The LM26420 regulator is a monolithic, high frequency, dual PWM step-down DC/DC converter in a 16 Pin LLP and a 20 Pin eTSSOP package. More...


Applications


Local 5V to Vcore Step-Down Converters
Core Power in HDDs
Set-Top Boxes
USB Powered Devices
DSL Modems
Powering Core and I/O voltages for FPGAs, CPLDs, and ASICs
  Typical Application
click for larger image

updated image

ParametersValues
Output Current 2000 mA
Input Min Voltage 3 Volt
Input Max Voltage 5.5 Volt
Output Min 0.8 Volt
Output Max 4.5 Volt
Frequency Min 1850, 400 kHz
Frequency Max 700, 2650 kHz
Efficiency (peak) 95, 94 %
On/Off Pin Yes
Error Flag Yes
SoftStart Yes
Sync Pin No
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 125 deg C
Adjustable Output Yes
Adj Switch Frequency No
PWM Mode Current Mode
Topology Buck
Step-Down Yes
Multiple Output Capability Yes
Output Range 0.8-4.5
Switching Frequency 1600, 550 kHz
Feedback Voltage 0.8 Volt
Regulator Family SIMPLE SWITCHER
PowerWise Yes
Synchronous Rectification Yes


Typical Performance


click for larger image


  Block Diagram
click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM26420 Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 601
Kbytes
1-Jun-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM26420XMHTSSOP EXP PAD20NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$2.38rail
of
73
NSUZXYTT
LM26420
XMH
16 weeksN/A
LM26420YMHTSSOP EXP PAD20NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$2.28rail
of
73
NSUZXYTT
LM26420
YMH
6 weeksN/A
LM26420XMHXTSSOP EXP PAD20NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.38reel
of
2500
NSUZXYTT
LM26420
XMH
16 weeksN/A
LM26420YMHXTSSOP EXP PAD20NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.28reel
of
2500
NSUZXYTT
LM26420
YMH
8 weeksN/A
LM26420XMHEVALLM26420 2.2 MHz, eTSSOP Synchronous Buck Evaluation BoardFull productionN/A
 
Buy Now
1+$85.001-
8 weeksN/A
LM26420XSQEVALLM26420 2.2 MHz, LLP Synchronous Buck Evaluation BoardFull productionN/A
 
Buy Now
1+$85.001-
8 weeksN/A
LM26420YMHEVALLM26420 550 kHz, eTSSOP Synchronous Buck Evaluation BoardFull productionN/A
 
Buy Now
1+$85.001-
8 weeksN/A
LM26420YSQEVALLM26420 550 kHz, LLP Synchronous Buck Evaluation BoardFull productionN/A
 
Buy Now
1+$85.001-
8 weeksN/A
LM26420XSQLLP16NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$2.38reel
of
1000
NS
UZXYTT
L26420X
6 weeksN/A
LM26420YSQLLP16NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$2.28reel
of
1000
NS
UZXYTT
L26420Y
6 weeksN/A
LM26420XSQXLLP16NOPB3260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.38reel
of
4500
NS
UZXYTT
L26420X
16 weeksN/A
LM26420YSQXLLP16NOPB3260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.28reel
of
4500
NS
UZXYTT
L26420Y
12 weeksN/A

General Description


The LM26420 regulator is a monolithic, high frequency, dual PWM step-down DC/DC converter in a 16 Pin LLP and a 20 Pin eTSSOP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM26420 is easy to use. The ability to drive two 2.0A loads with an internal 75 mΩ PMOS top switch and an internal 50 mΩ NMOS bottom switch using state-of-the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 550 kHz or 2.2 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current. The LM26420 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, power good indicators, precision enables, and output over-voltage protection.

Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1870: Application Note 1870 LM26420 Evaluation Board 429
Kbytes
14-Apr-09 Download
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators 348
Kbytes
25-Jun-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]