LT1576-5

Features: Constant 200kHz Switching Frequency1.21V Reference VoltageFixed 5V Output OptionEasily SynchronizableUses All Surface Mount ComponentsInductor Size Reduced to 15µHSaturating Switch Design: 0.2ΩEffective Supply Current: 1.16mAShutdown Current: 20µACycle-by-Cycle Current ...

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LT1576-5 Picture
SeekIC No. : 004400697 Detail

LT1576-5: Features: Constant 200kHz Switching Frequency1.21V Reference VoltageFixed 5V Output OptionEasily SynchronizableUses All Surface Mount ComponentsInductor Size Reduced to 15µHSaturating Switch D...

floor Price/Ceiling Price

Part Number:
LT1576-5
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/27

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Product Details

Description



Features:

Constant 200kHz Switching Frequency
1.21V Reference Voltage
Fixed 5V Output Option
Easily Synchronizable
Uses All Surface Mount Components
Inductor Size Reduced to 15µH
Saturating Switch Design: 0.2Ω
Effective Supply Current: 1.16mA
Shutdown Current: 20µA
Cycle-by-Cycle Current Limiting
Fused Lead SO-8 Package



Application

Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power



Pinout

  Connection Diagram


Specifications

BOOST Pin Above Input Voltage............................. 10V
SHDN Pin Voltage..................................................... 7V
BIAS Pin Voltage...................................................... 7V
FB Pin Voltage (Adjustable Part)........................... 3.5V
FB Pin Current (Adjustable Part)........................... 1mA
SYNC Pin Voltage..................................................... 7V
Operating Junction Temperature Range
LT1576C.................................................0°C to 125° C
LT1576I.............................................. 40°C to 125°C
Storage Temperature Range.............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)............... 300°C



Description

The LT1576 is a 200kHz monolithic buck mode switching regulator. A 1.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. The topology is current mode for fast transient response and good loop stability. The LT1576 is a modified version of the industry standard LT1376 optimized for noise sensitive applications.

In addition, the reference voltage has been lowered to allow LT1576 to produce output voltages down to 1.2V. Quiescent current has been reduced by a factor of two. Switch on resistance has been reduced by 30%. Switch tran- sition times have been slowed to reduce EMI generation. The oscillator frequency has been reduced to 200kHz to maintain high efficiency over a wide output current range.

The pinout of LT1576 has been changed to improve PC layout by allowing the high current high frequency switching cir- cuitry to be easily isolated from low current noise sensitive control circuitry. The new SO-8 package includes a fused ground lead which significantly reduces the thermal resis- tance of the device to extend the ambient operating tem- perature range. There is an optional function of shutdown or synchronization. Standard surface mount external parts can be used including the inductor and capacitors.




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