Electronic Components Datasheet Search |
|
ISL6420BIRZ Datasheet(PDF) 11 Page - Intersil Corporation |
|
ISL6420BIRZ Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 20 page 11 FN6901.0 April 27, 2009 GPIO1/REFIN This is a dual function pin. If VMSET/MODE is not connected to VCC5 then this pin serves as GPIO1. Refer to Table 3 for GPIO commands interpretation. If VMSET/MODE is connected to VCC5 then this pin will serve as REFIN. As REFIN, this pin is the non-inverting input to the error amplifier. Connect the desired reference voltage to this pin in the range of 0.6V to 1.25V. Connect this pin to VCC5 to use internal reference. REFOUT It provides buffered reference output for REFIN. Connect 2.2µF decoupling capacitor to this pin. VMSET/MODE This pin is a dual function pin. Tie this pin to VCC5 to disable voltage margining. When not tied to VCC5, this pin serves as VMSET. Connect a resistor from this pin to ground to set delta for voltage margining. If voltage margining and external reference tracking mode are not needed, this pin can be tied directly to ground. GPIO2 This is general purpose IO pin for voltage margining. Refer to Table 3. Exposed Thermal Pad This pad is electrically isolated. Connect this pad to the signal ground plane using at least five vias for a robust thermal conduction path. Functional Description Initialization The ISL6420B automatically initializes upon receipt of power. The Power-On Reset (POR) function monitors the internal bias voltage generated from LDO output (VCC5) and the ENSS pin. The POR function initiates the soft-start operation after the VCC5 exceeds the POR threshold. The POR function inhibits operation with the chip disabled (ENSS pin <1V). The device can operate from an input supply voltage of 5.6V to 28V connected directly to the VIN pin using the internal 5V linear regulator to bias the chip and supply the gate drivers. For 5V ±10% applications, connect VIN to VCC5 to bypass the linear regulator. Soft-Start/Enable The ISL6420B soft-start function uses an internal current source and an external capacitor to reduce stresses and surge current during start-up. When the output of the internal linear regulator reaches the POR threshold, the POR function initiates the soft-start sequence. An internal 10µA current source charges an external capacitor on the ENSS pin linearly from 0V to 3.3V. When the ENSS pin voltage reaches 1V typically, the internal 0.6V reference begins to charge following the dv/dt of the ENSS voltage. As the soft-start pin charges from 1V to 1.6V, the reference voltage charges from 0V to 0.6V. Figure 9 shows a typical soft-start sequence. TABLE 2. VOLTAGE MARGINING/DDR OR TRACKING SUPPLY PIN CONFIGURATION FUNCTION/MODES PIN CONFIGURATIONS VMSET/MODE REFOUT GPIO1/REFIN (Note 9) GPIO2 (Note 9) Enable Voltage Margining Pin Connected to GND with resistor. It is used as VMSET. Connect a 2.2µF capacitor for bypass of external reference. Serves as a general purpose I/O. Refer to Table 3. Serves as a general purpose I/O. Refer to Table 3. No Voltage Margining. Normal operation with internal reference. Buffered VREFOUT = 0.6V. H Connect a 2.2µF capacitor to GND. H (Note 10) L No Voltage Margining. External reference. Buffered VREFOUT = VREFIN H Connect a 2.2µF capacitor to GND. Connect to an external reference voltage source (0.6V to 1.25V) L NOTES: 9. The GPIO1/REFIN and GPIO2 pins cannot be left floating. 10. Ensure that GPIO1/REFIN is tied high prior to the logic change at VMSET/MODE. TABLE 3. VOLTAGE MARGINING CONTROLLED BY GPIO1 AND GPIO2 GPIO1 GPIO2 VOUT L L No Change LH + ΔVOUT HL - ΔVOUT H H Ignored ISL6420B |
Similar Part No. - ISL6420BIRZ |
|
Similar Description - ISL6420BIRZ |
|
|
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 |