 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LT1576IS8 Datasheet(PDF) 3 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LT1576IS8 Datasheet(HTML) 3 Page - Linear Technology |
|
|
3 / 28 page  3 LT1576/LT1576-5 PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Switch Duty Cycle (Note 10) 8% Switch Frequency VC Set to Give 50% Duty Cycle 180 200 220 kHz q 160 240 kHz Switch Frequency Line Regulation 5V ≤ VIN ≤ 25V q 0 0.15 %/ V Frequency Shifting Threshold on FB Pin ∆f = 10kHz q 0.4 0.74 1.0 V Minimum Input Voltage (Note 3) q 5.0 5.5 V Minimum Boost Voltage (Note 4) ISW ≤ 1.5A q 2.3 3.0 V Boost Current (Note 5) ISW = 0.5A q 918 mA ISW = 1.5A q 27 50 mA VIN Supply Current (Note 6) VBIAS = 5V q 0.55 0.8 mA BIAS Supply Current (Note 6) VBIAS = 5V q 1.6 2.2 mA Shutdown Supply Current VSHDN = 0V, VIN ≤ 25V, VSW = 0V, VC Open 20 50 µA q 75 µA Lockout Threshold VC Open q 2.34 2.42 2.50 V Shutdown Thresholds VC Open Device Shutting Down q 0.13 0.37 0.60 V Device Starting Up q 0.25 0.45 0.7 V Synchronization Threshold 1.5 2.2 V Synchronizing Range 250 400 kHz SYNC Pin Input Resistance 40 k Ω Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Gain is measured with a VC swing equal to 200mV above the switching threshold level to 200mV below the upper clamp level. Note 3: Minimum input voltage is not measured directly, but is guaranteed by other tests. It is defined as the voltage where internal bias lines are still regulated so that the reference voltage and oscillator frequency remain constant. Actual minimum input voltage to maintain a regulated output will depend on output voltage and load current. See Applications Information. Note 4: This is the minimum voltage across the boost capacitor needed to guarantee full saturation of the internal power switch. Note 5: Boost current is the current flowing into the boost pin with the pin held 5V above input voltage. It flows only during switch on time. Note 6: VIN supply current is the current drawn when the BIAS pin is held at 5V and switching is disabled. Total input referred supply current is calculated by summing input supply current (ISI) with a fraction of BIAS supply current (ISB) ITOT = ISI + (ISB)(VBIAS/VIN)(1.15) with VIN = 15V, VBIAS = 5V, ISI = 0.55mA, ISB = 1.6mA and ITOT = 1.16mA. If the BIAS pin is unavailable or open circuit, the sum of VIN and BIAS supply currents will be drawn by the VIN pin. Note 7: Switch on resistance is calculated by dividing VIN to VSW voltage by the forced current (1.5A). See Typical Performance Characteristics for the graph of switch voltage at other currents. Note 8: Transconductance and voltage gain refer to the internal amplifier exclusive of the voltage divider. To calculate gain and transconductance, refer to the SENSE pin on the fixed voltage parts. Divide values shown by the ratio VOUT/1.21. Note 9: Slope compensation is the current subtracted from the switch current limit at 80% duty cycle. See Maximum Output Load Current in the Applications Information section for further details. Note 10: Minimum on-time is 400ns typical. For a 200kHz operating frequency this means the minimum duty cycle is 8%. In frequency foldback mode, the effective duty cycle will be less than 8%. ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA, TJ = 25°C, VIN = 15V, VC = 1.5V, Boost = VIN + 5V, switch open, unless otherwise noted. |
Similar Part No. - LT1576IS8 |
|
Similar Description - LT1576IS8 |
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
