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LTC1779

Features: ` High Efficiency: Up to 94%` 250mA Output Current`Wide VIN Range: 2.5V to 9.8V`550kHz Constant Frequency Operation` Burst ModeTM Operation at Light Load` Low Dropout: 100% Duty Cycle`0.8V Reference Allows Low Output Voltages` ±2.5% Reference Accuracy` Current Mode Operation for Excellen...

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SeekIC No. : 004401904 Detail

LTC1779: Features: ` High Efficiency: Up to 94%` 250mA Output Current`Wide VIN Range: 2.5V to 9.8V`550kHz Constant Frequency Operation` Burst ModeTM Operation at Light Load` Low Dropout: 100% Duty Cycle`0.8V...

LTC1779 Data Sheet

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Part Number:
LTC1779
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: 2024/11/21

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Product Details

Description



Features:

` High Efficiency: Up to 94%
` 250mA Output Current
`Wide VIN Range: 2.5V to 9.8V
`550kHz Constant Frequency Operation
` Burst ModeTM Operation at Light Load
` Low Dropout: 100% Duty Cycle
`0.8V Reference Allows Low Output Voltages
` ±2.5% Reference Accuracy
` Current Mode Operation for Excellent Line and Load Transient Response
` Low Quiescent Current: 135A
` Shutdown Mode Draws Only 8A Supply Current
`Low Profile (1mm) ThinSOTTM Package


Application

· 1- or 2-Cell Lithium-Ion-Powered Applications
· Cellular Telephones
· Wireless Modems
· Portable Computers
· Distributed 3.3V, 2.5V or 1.8V Power Systems
· Scanners


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN)..........................0.3V to 10V
SENSE, SW Voltages ...................0.3V to (VIN + 0.3V)
VFB, ITH/RUN Voltages ..............................0.3V to 2.4V
SW Peak Output Current (<10s) .......................... 0.5A
Storage Ambient Temperature Range ... 65 to 150
Operating Temperature Range (Note 2) ...40 to 85
Junction Temperature (Note 3) ............................. 150
Lead Temperature (Soldering, 10 sec).................. 300


Description

The LTC®1779 is a constant frequency current mode stepdown DC/DC converter in a 6-lead ThinSOT package. The part operates with a 2.5V to 9.8V input and can provide up to 250mA of output current. Current mode control provides excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1779 when the input voltage falls below 2V.

The LTC1779 boasts a ±2.5% output voltage accuracy and consumes only 135A of quiescent current. For applications where efficiency is a prime consideration, the LTC1779 is configured for Burst Mode operation, which enhances efficiency at low output current.

To further maximize the life of a battery source, the internal P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 8A. High constant operating frequency of 550kHz allows the use of a small external inductor.

The LTC1779 is available in a low profile (1mm) ThinSOT package.




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