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DATASHEET
High-Performance Notebook PWM Controller
ISL6269A
The ISL6269A 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 and bootstrap diode result in fewer components and
smaller implementation area.
Intersil’s 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 V
R
, analogous to the output inductor ripple current. The
AC signal V
R
enters a window comparator where the lower
threshold is the error amplifier output V
COMP
, and the upper
threshold is a programmable voltage reference V
W,
resulting in
generation of the PWM signal. The voltage reference V
W
sets
the steady-state PWM frequency. Both edges of the PWM can
be modulated in response to input voltage transients and
output load transients, much faster than conventional
fixed-frequency PWM controllers. Unlike a conventional
hysteretic converter, the ISL6269A has an error amplifier that
provides ±1% voltage regulation at the FB pin.
The ISL6269A has a 1.5ms digital soft-start and can be
started into a prebiased output voltage. A resistor divider is
used to program the output voltage setpoint. The ISL6269A
can be configured to operate in Continuous Conduction Mode
(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.
Features
• High performance R3™ Technology
• Fast transient response
• ±1% regulation accuracy: -10°C to +100°C and
-40°C to +100°C
• Wide input voltage range: +5.0V to +25.0V
• Output voltage range: +0.6V to +3.3V
• Wide output load range: 0A to 25A
• Selectable diode emulation mode for increased light load
efficiency
• Programmable PWM frequency: 200kHz to 600kHz
• Prebiased output start-up capability
• Integrated MOSFET drivers and bootstrap diode
• Internal digital soft-start
•Power good monitor
•Fault protection
- Undervoltage protection
- Soft crowbar overvoltage protection
-Low-side MOSFET r
DS(ON)
overcurrent protection
- Over-temperature protection
- Fault identification by PGOOD pull down resistance
• Pb-free (RoHS compliant)
Applications
• PCI express graphical processing unit
• Auxiliary power rail
•VRM
• Network adapter
November 18, 2014
FN9253.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Copyright Intersil Americas LLC 2005-2007, 2014. All Rights Reserved
Intersil (and design) and R3 Technology are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
