ISL6268CAZ Intersil, ISL6268CAZ Datasheet
ISL6268CAZ
Specifications of ISL6268CAZ
Available stocks
Related parts for ISL6268CAZ
ISL6268CAZ Summary of contents
Page 1
... Network adapter Ordering Information PART NUMBER UG ISL6268CAZ BOOT (Note) PVCC ISL6268CAZ-T (Note) LG PGND NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% ISEN matte tin plate termination finish, which are RoHS compliant and VO compatible with both SnPb and Pb-free soldering operations ...
Page 2
Block Diagram VIN GND VCC V REF EN − OVP + − UVP + + EA EA − FB COMP − ISEN OCP 30Ω PGOOD PWM FREQUENCY CONTROL + − ...
Page 3
Typical Application R PGOOD 5V R VCC C C PVCC VCC R COMP C COMP1 C COMP2 R BOTTOM 3 ISL6268 ISL6268 PGOOD VIN PVCC UG VCC BOOT GND PHASE ISEN EN LG COMP PGND FB FSET VO R TOP ...
Page 4
Absolute Voltage Ratings ISEN, VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V VCC, PGOOD ...
Page 5
Electrical Specifications These specifications apply for T All typical specifications T PARAMETER POWER GOOD PGOOD Pull-Down Impedance PGOOD Leakage Current PGOOD Maximum Sink Current (Note 2) PGOOD Soft-Start Delay GATE DRIVER UG Pull-Up Resistance UG Source Current (Note 2) UG ...
Page 6
Functional Pin Descriptions PHASE (Pin 1) The PHASE pin detects the voltage polarity of the PHASE node and is also the current return path for the UG high-side MOSFET gate driver. Connect the PHASE pin to the node consisting of ...
Page 7
... Theory of Operation Modulator The ISL6268 is a hybrid of fixed frequency PWM control, and variable frequency hysteretic control. Intersil’s R can simultaneously affect the PWM switching frequency and PWM duty cycle in response to input voltage and output load transients. The term “Ripple” in the name “Robust Ripple Regulator” ...
Page 8
TABLE 1. PGOOD PULL-DOWN RESISTANCE CONDITION PGOOD RESISTANCE VCC below POR Soft Start or Undervoltage Overvoltage Overcurrent The ISL6268 has internal gate-drivers for the high-side and low-side N-Channel MOSFETs. The LG gate-driver is optimized for low duty-cycle applications where the ...
Page 9
PHASE and GND pins is nulled by the voltage dropped across conducts through it. An OCP fault SEN SEN occurs if I rises above the OCP threshold current I SEN while attempting to null the negative ...
Page 10
... ISL6268 makes the LC output filter resemble a first order system in which the closed loop stability can be achieved with a Type II compensation network. Your local Intersil representative can provide a PC-based tool that can be used to calculate compensation network component values and help simulate the loop frequency response ...
Page 11
... It is assumed that the reader is familiar with many of the basic skills and techniques referenced in the following sections. In addition to this document, Intersil provides complete reference designs that include schematics, bills of materials, and example board layouts. Selecting the LC Output Filter The duty cycle of an ideal buck converter is a function of the input and the output voltage ...
Page 12
MOSFET Selection and Considerations Typically, a MOSFET cannot tolerate even brief excursions beyond their maximum drain to source voltage rating. The MOSFETs used in the power stage of the converter should have a maximum V rating that exceeds the sum ...
Page 13
EN (Pin 5), and PGOOD (Pin 2) These are logic inputs that are referenced to the GND pin. Treat as a typical logic signal. COMP (Pin 6), FB (Pin 7), and VO (Pin 10) For best results, use an isolated ...
Page 14
... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...