ISL6269A
®
Data Sheet
August 7, 2006
FN9253.1
High-Performance Notebook PWM
Controller
Features
3
• High performance R technology
The ISL6269A IC is a Single-Phase Synchronous-Buck
PWM controller featuring Intersil's Robust Ripple Regulator
(R ) 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.
• Fast transient response
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• ±1% regulation accuracy: -10°C to +100°C
• Wide input voltage range: +7.0V to +25.0V
• Output voltage range: +0.6V to +3.3V
• Wide output load range: 0A to 25A
3
Intersil’s R technology combines the best features of fixed-
frequency PWM and hysteretic PWM while eliminating many
of their shortcomings. R technology employs an innovative
• Selectable diode emulation mode for increased light load
efficiency
3
modulator that synthesizes an AC ripple voltage signal V ,
analogous to the output inductor ripple current. The AC
R
• Programmable PWM frequency: 200kHz to 600kHz
• Pre-biased output start-up capability
• Integrated MOSFET drivers and bootstrap diode
• Internal digital soft-start
signal V enters a window comparator where the lower
R
threshold is the error amplifier output V
, and the upper
COMP
threshold is a programmable voltage reference V resulting
W,
in generation of the PWM signal. The voltage reference V
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
W
• Power good monitor
• Fault protection
- Undervoltage protection
- Soft crowbar overvoltage protection
conventional hysteretic converter, the ISL6269A has an error
amplifier that provides ±1% voltage regulation at the FB pin.
- Low-side MOSFET r
overcurrent protection
DS(on)
- Over-temperature protection
The ISL6269A 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 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.
- Fault identification by PGOOD pull down resistance
Applications
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adapter
Ordering Information
Pinout
PART
PKG.
DWG. #
ISL6269A (4x4 QFN)
PART NUMBER MARKING TEMP (°C)
PACKAGE
TOP VIEW
ISL6269ACRZ
(See Note)
6269ACRZ -10 to +100 16 Ld 4x4 QFN L16.4x4
(Pb-Free)
ISL6269ACRZ-T 6269ACRZ 16 Ld 4x4 QFN Tape and
(See Note) Reel (Pb-Free)
L16.4x4
16 15 14 13
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
PVCC
LG
1
2
3
4
12
11
VIN
VCC
FCCM
EN
GND
10 PGND
ISEN
9
5
6
7
8
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
1
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