ISL6269

Features:

• High performance synthetic ripple regulation
• Extremely fast transient response
• External type-two loop compensation
• ±1% regulation accuracy: -10°C to +100°C
• Starts into a pre-biased output
• Wide input voltage range: +7.0V to +25.0V
• Wide output voltage range: +0.6V to +3.3V
• Wide output load range: 0A to 25A
• Programmable PWM frequency: 200kHz to 600kHz
• Power good monitor
• Fault identification by PGOOD pull down resistance
• Integrated MOSFET drivers with shoot-through protection
• Internal digital soft-start
• Internal 5V LDO regulator
• Configure forced continuous conduction or diode emulation for increased light load efficiency
• PWM minimum frequency above audible spectrum
• Integrated boot-strap diode
• Low-side MOSFET r_DS(ON) overcurrent protection
• Undervoltage protection
• Soft crowbar overvoltage protection
• Over-temperature protection
• Pb-Free Plus Anneal Available (RoHS Compliant)




Application

• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adapter




Pinout






Specifications

ISEN, VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
VCC, PGOOD to GND . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
PVCC to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
GND to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
EN, FCCM. . . . . . . . . . . . . . . . . . . . . . .. . -0.3V to GND, VCC +3.3V
PHASE to GND. . . . . . . . . . . . . . . . . . . . . . . . . . (DC) -0.3V to +28V
. . . . . . . . . . . . . . . . . . . . . . . . . . (<100ns Pulse Width, 10µJ) -5.0V
BOOT to GND, or PGND . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V
BOOT to PHASE . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . -0.3V to +7V
UG. . . . . . . . . . . . . . . . . . . . . . . (DC) -0.3V to PHASE, BOOT +0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . (<200ns Pulse Width, 20µJ) -4.0V
LG . . . . . . . . . . . . . . . . . . . . . . . . (DC) -0.3V to PGND, PVCC +0.3V
. . . . . . . . . . . . . . . . . . . . . . . .. . . (<100ns Pulse Width, 4µJ) -2.0V
ESD Classification . . . . . . . . . . . . . . . . . . . . . .Level 1 (HBM = 2kV)




Description

The ISL6269 IC is a Single-Phase Synchronous-Buck PWM controller featuring Intersil's Robust Ripple Regulator (R3) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers, 5V LDO and bootstrap diode result in fewer components and smaller implementation area. Intersils R3 technology combines the best features of fixed-frequency PWM and hysteretic PWM while eliminating many of their shortcomings. R3 technology employs an innovative modulator that synthesizes an AC ripple voltage signal VR, analogous to the output inductor ripple current. The AC signal VR enters a window comparator where the lower threshold is the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation of the PWM signal. The voltage reference VW sets the steadystate PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixedfrequency PWM controllers. Unlike a conventional hysteretic converter, the ISL6269 has an error amplifier that provides 1% voltage regulation at the FB pin. The ISL6269 has a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6269 can be configured to operate in continuous-conductionmode (CCM) or diode-emulation-mode (DEM), which improves light-load efficiency. In CCM the controller always operates as a synchronous rectifier however, when DEM is enabled the low-side MOSFET is permitted to stay off, blocking negative current flow into the low-side MOSFET from the output inductor.