Electronic Components Datasheet Search |
|
LT1578C Datasheet(PDF) 1 Page - Linear Technology |
|
LT1578C Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page 1 LT1578/LT1578-2.5 1.5A, 200kHz Step-Down Switching Regulator 3.3V Buck Converter Efficiency vs Load Current s 1.5A Switch Current s High Efficiency—Low Loss 0.2 Ω Switch s Constant 200kHz Switching Frequency s 4V to 15V Input VoltageRange s Minimum Output: 1.21V s Low Supply Current: 1.9mA s Low Shutdown Current: 20 µA s Easily Synchronizable Up to 400kHz s Cycle-by-Cycle Current Limit s Reduced EMI Generation s Low Thermal Resistance SO-8 Package s Uses Small Low Value Inductors The LT ®1578 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 LT1578 is a modified version of the LT1507 that has been optimized for noise sensitive appli- cations. It will operate over a 4V to 15V input range. In addition, the reference voltage has been lowered to al- low the device 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 has been changed to improve PC layout by al- lowing the high current, high frequency switching circuitry to be easily isolated from low current, noise sensitive con- trol circuitry. The new SO-8 package includes a fused ground lead that significantly reduces the thermal resistance of the device to extend the ambient operating temperature range. Standard surface mount external parts can be used including the inductor and capacitors. s Portable Computers s Battery-Powered Systems s Battery Chargers s Distributed Power Systems , LTC and LT are registered trademarks of Linear Technology Corporation. LOAD CURRENT (A) 0 90 85 80 75 70 65 60 55 50 0.25 0.50 0.75 1.00 1578 TA02 1.25 1.50 VOUT = 3.3V VIN = 5V L = 25 µH DESCRIPTIO FEATURES APPLICATIO S BOOST LT1578 VIN SHDN OUTPUT** 3.3V, 1.25A * RIPPLE CURRENT RATING ≥ IOUT/2 ** INCREASE L1 TO 30 µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 60 µH ABOVE 1A SEE APPLICATIONS INFORMATION INPUT 5V TO 15V 1578 TA01 C2 0.33 µF CC 100pF D1 1N5818 C1 100 µF, 10V SOLID TANTALUM C3* 10 µF TO 50 µF OPEN = ON D2 1N914 L1** 15 µH VSW FB GND VC + + R2 4.99k R1 8.66k TYPICAL APPLICATION |
Similar Part No. - LT1578C |
|
Similar Description - LT1578C |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |