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LM2588

Features: ` Requires few external components` Family of standard inductors and transformers` NPN output switches 5.0A, can stand off 65V` Wide input voltage range: 4V to 40V` Adjustable switching frequency: 100 kHz to 200 kHz` External shutdown capability` Draws less than 60 A when shut down` Freq...

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SeekIC No. : 004394900 Detail

LM2588: Features: ` Requires few external components` Family of standard inductors and transformers` NPN output switches 5.0A, can stand off 65V` Wide input voltage range: 4V to 40V` Adjustable switching fr...

LM2588 Data Sheet

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Part Number:
LM2588
Supply Ability:
5000

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Product Details

Description



Features:

` Requires few external components
` Family of standard inductors and transformers
` NPN output switches 5.0A, can stand off 65V
` Wide input voltage range: 4V to 40V
` Adjustable switching frequency: 100 kHz to 200 kHz
` External shutdown capability
` Draws less than 60 A when shut down
` Frequency synchronization
` Current-mode operation for improved transient response, line regulation, and current limit
` Internal soft-start function reduces in-rush current during start-up
` Output transistor protected by current limit, under voltage lockout, and thermal shutdown
` System output voltage tolerance of ±4% max over line and load conditions




Application

· Flyback regulator
· Forward converter
·Multiple-output regulator
·Simple boost regulator




Specifications

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Input Voltage ..................................................−0.4V VIN £ 45V
Switch Voltage............................................... −0.4V VSW £ 65V
Switch Current (Note 2) Internally Limited
Compensation Pin Voltage .......................−0.4V VCOMP 2.4V
Feedback Pin Voltage ................................−0.4VVFB 2 VOUT
ON /OFF Pin Voltage........................................ .−0.4V VSH 6V
Sync Pin Voltage......................................... −0.4V VSYNC 2V
Power Dissipation (Note 3) Internally Limited
Storage Temperature Range .............................−65 to +150
Lead Temperature(Soldering, 10 sec.)................................ 260
Maximum Junction Temperature(Note 3) ..............................150
Minimum ESD Rating(C = 100 pF, R = 1.5 k).........................2kV

Output Range 1.23V min, 5V, 12V, 3.3V
Switch Current 5 Amp
Input Min Voltage 4 Volt
Input Max Voltage 40 Volt
Feedback Voltage 3.3, 1.23, 12, 5 Volt
Frequency Max 200 kHz
Efficiency (peak) 90, 75, 80 %
Sync Pin Yes
Adj Switch Frequency Yes
Frequency Min 100 kHz
On/Off Pin Yes
Error Flag No
SoftStart Yes
Special Features SIMPLE SWITCHER regulator
Topology Boost, Flyback
Step-Up Yes
Inverting No
Flyback Yes
RegType Switching Regulator
Adjustable Output Yes, No
Temperature Min -40 deg C
Temperature Max 125 deg C
Regulator Family SIMPLE SWITCHER
View Using Catalog





Description

The LM2588 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. The device is available in 4 bdifferent output voltage versions: 3.3V, 5.0V, 12V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Included in the datasheet are typical circuits of boost and flyback regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers designed to work with these switching regulators.

The power switch is a 5.0A NPN device that can stand-off 65V. Protecting the power switch are current and thermal limiting circuits, and an undervoltage lockout circuit. This IC contains an adjustable frequency oscillator that can be programmed up to 200 kHz. The oscillator can also be synchronized with other devices, so that multiple devices can operate at the same switching frequency.

Other features of LM2588 include soft start mode to reduce in-rush current during start up, and current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. The device also has a shutdown pin, so that it can be turned off externally. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is guaranteed for the power supply system.






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