Moteur de recherche de fiches techniques de composants électroniques |
|
LM2608 Fiches technique(PDF) 5 Page - National Semiconductor (TI) |
|
|
LM2608 Fiches technique(HTML) 5 Page - National Semiconductor (TI) |
5 / 18 page Electrical Characteristics (Continued) Specifications with standard typeface are for T A =TJ = 25˚C, and those in bold face type apply over the full Operating Tem- perature Range (T A =TJ = −25˚C to +85˚C). Unless otherwise specified, PVIN = VDD = EN = SYNC = 3.6V, VSEL = 0V, VREF = 1.35V. Symbol Parameter Conditions Min Typ Max Units V SYNC_H SYNC/MODE Positive Going Threshold Voltage 0.85 1.3 V V SYNC_L SYNC/MODE Negative Going Threshold Voltage 0.4 0.80 V V SEL_H V SEL Positive Going Threshold Voltage 0.80 1.3 V V SEL_L V SEL Negative Going Threshold Voltage 0.4 0.75 V I SEL VSEL Pull Down Current VSEL = 1.2V 0.70 2 µA I REF Input current into VREF pin 15 150 nA f sync SYNC/MODE Clock Frequency Range (Note 9) 500 1000 kHz F OSC Internal Oscillator Frequency LM2608ATL-1.3/1.8, PWM Mode 510 610 690 kHz T min Minimum ON-Time of P FET Switch in PWM Mode 200 ns Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but parameter specifications may not be guaranteed. For guaranteed specifications and associated test conditions, see the Min and Max limits and Conditions in the Electrical Characteristics table. Electrical Characteristics table limits are guaranteed by production testing, design or correlation using standard Statistical Quality Control methods. Typical (Typ) specifications are mean or average values from characterization at 25˚C and are not guaranteed. Note 2: Thermal shutdown will occur if the junction temperature exceeds the 150˚C maximum junction temperature of the device. Note 3: Thermal resistance specified with 2 layer PCB(0.5/0.5 oz. cu). Note 4: The LM2608 is designed for cell phone applications where turn-on after system power-up is controlled by the system processor and internal UVLO (Under Voltage LockOut) circuitry is unnecessary. The LM2608 has no UVLO circuitry and should be kept in shutdown by holding the EN pin low until the input voltage exceeds 2.8V. Although the LM2608 exhibits safe behavior while enabled at low input voltages, this is not guaranteed. Note 5: The LM2608 PWM mode output voltage precision is ±1% when operating from an external 1.35V reference voltage. Note 6: The hysteresis voltage is the minimum voltage swing on FB that causes the internal feedback and control circuitry to turn the internal PFET switch on and then off, during test mode. Note 7: Current limit is built-in, fixed, and not adjustable. If the current limit is reached while the output is pulled below about 0.7V, the internal PFET switch turns off for 2.5 µs to allow the inductor current to diminish. Note 8: EN is a Schmitt trigger digital input with logic thresholds that are independent of supply voltage at the VDD pin. Note 9: SYNC driven with an external clock switching between VDD and GND. When an external clock is present at SYNC, the IC is forced into PWM mode at the external clock frequency. The LM2608 synchronizes to the rising edge of the external clock. www.national.com 5 |
Numéro de pièce similaire - LM2608 |
|
Description similaire - LM2608 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |