LM5088 - Wide Input Range Non-Synchronous Buck Controller from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Knowledge Base

Features
•Emulated current mode control
•Drives external high-side N-channel MOSFET
•Ultra-wide input voltage range from 4.5V to 75V
•Low IQ Shutdown and Standby modes
•High duty cycle ratio feature for reduced dropout voltage
•Spread spectrum EMI reduction (LM5088-1)
•Hiccup timer for overload protection (LM5088-2)
•Adjustable output voltage from 1.205V with 1.5% feedback reference accuracy
•Wide bandwidth error amplifier
•Single resistor oscillator frequency setting
•Oscillator synchronization capability
•Programmable soft-start
•High voltage, low dropout bias regulator
•Thermal shutdown protection

General Description

The LM5088 high voltage non-synchronous buck controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. More...


  Typical Application
*click for larger image


ParametersValues
Output Current 10000 mA
Input Min Voltage 4.5 Volt
Input Max Voltage 75 Volt
Frequency Min 50 kHz
Frequency Max 1000 kHz
Feedback Voltage 1.205 Volt
Feedback Tolerance 1.5 %
Efficiency (peak) 97 %
Adj Switch Frequency Yes
Adjustable Output Yes
Synchronous Rectification No
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin Yes
Inverting No
Flyback No
Lossless Current Sense No
RegType Switching Controller
Temperature Min -40 deg C
Temperature Max 125 deg C
Special Features Spread Spectrum EMI reduction (Lm5088-1), Hiccup Mode Restart (LM5088-2), Low Dropout Mode and Low Iq shutdown and standby currents
Topology Buck
PWM Mode Emulated Current Mode
Step-Down Yes
Step-Up No
Multiple Output Capability No
Output Max 70 Volt
Output Min 1.205 Volt
Automotive Yes
PowerWise Yes
Quiescent Current 3.8 mA


Typical Performance

*click for larger image


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LM5088
 
4.50 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 75.00
V out 1.23 <=  V <= 75.00
I out    A <= 10.00
Ambient Temperature  °C <= 100


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Also Recommended
LM25088▲Lower Voltage Version Of LM5088
LM5116▲Wide Range Synchronous Buck Controller
Additional Resources
Design Tools


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM5088 Wide Input Range Non-Synchronous Buck Controller 532
Kbytes		 8-Jun-09 Download

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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
LM5088MH-1TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.60rail
of
92		NSUZXYTT
LM5088
MH-1
6 weeksN/A
LM5088MH-2TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.60rail
of
92		NSUZXYTT
LM5088
MH-2
6 weeksN/A
LM5088MHX-1TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.60reel
of
2500		NSUZXYTT
LM5088
MH-1
12 weeksN/A
LM5088MHX-2TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.60reel
of
2500		NSUZXYTT
LM5088
MH-2
6 weeksN/A
LM5088MH-1EVALLM5088-1 - Wide Input Range Non-Synchronous Buck Controller with DitheringFull productionN/A
 
Buy Now 		1+$60.001-
N/AN/A
LM5088MH-2EVALLM5088-2 - Wide Input Range Non-Synchronous Buck Controller with Hiccup Mode RestartFull productionN/A
 
Buy Now 		1+$60.001-
N/AN/A

General Description

The LM5088 high voltage non-synchronous buck controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. The LM5088 can be configured to operate over an ultra-wide input voltage range of 4.5V to 75V. This easy to use controller includes a level shifted gate driver capable of controlling an external N-channel buck switch. The control method is based upon peak current mode control utilizing an emulated current ramp. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage/low output voltage applications. The LM5088 switching frequency is programmable from 50 kHz to 1 MHz.

The LM5088 is available in two versions: The LM5088-1 provides a +/-5% frequency dithering function to reduce the conducted and radiated EMI, while the LM5088-2 provides a versatile restart timer for overload protection. Additional features include a low dropout bias regulator, tri-level enable input to control shutdown and standby modes, soft-start and oscillator synchronization capability. The device is available in a thermally enhanced TSSOP-16EP pin package.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM5088MH-1ABCD150XV1038680025950002736338335
LM5088MH-2ABCD150XV1038680025950002736338335
LM5088MHX-1ABCD150XV1038680025950002736338335
LM5088MHX-2ABCD150XV1038680025950002736338335

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.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
LM(2)5088 Quick Start Calculator 268 Kbytes 5-Dec-2008 View    

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Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1913: Application Note 1913 LM5088 Evaluation Board 246
Kbytes		 9-Dec-08 Download

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

[Information as of 8-Nov-2009]