1
FN9177.3
ISL6269
High-Performance Notebook PWM
Controller with Bias Regulator and
Audio-Frequency Clamp
The ISL6269 IC is a Single-Phase Synchronous-Buck PWM
controller featuring Intersil's Robust Ripple Regulator (R
3
)
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.
Intersil’s R
3
technology combines the best features of fixed-
frequency PWM and hysteretic PWM while eliminating many
of their shortcomings. R
3
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 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-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.
Pinout
ISL6269
(16 LD 4x4 QFN)
TOP VIEW
Features
• High performance R
3
technology
• Fast transient response
• +0.6V Internal Reference
- ±0.6% tolerance over the commercial temperature
range (0°C to +70°C)
- ±1.0% tolerance over the industrial temperature range
(-40°C to +85°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
• Selectable diode emulation mode for increased light load
efficiency
• Programmable PWM frequency: 200kHz to 600kHz
• Pre-biased output start-up capability
• Internal 5V LDO for self-biasing
• Integrated MOSFET drivers and bootstrap diode
• Internal digital soft-start
• Power good monitor
• PWM minimum frequency above audible spectrum
• 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
1
3
4
1516 14 13
2
12
10
9
11
6578
GND
BOOT
PGOOD
UG
PHASE
VO
COMP
FSET
FB
ISEN
PVCC
PGND
LG
EN
VIN
FCCM
VCC
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP
RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL6269CRZ* 62 69CRZ -10 to +100 16 Ld 4x4 QFN L16.4x4
ISL6269IRZ* 62 69IRZ -40 to +100 16 Ld 4x4 QFN L16.4x4
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination
finish, which is 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.
Data Sheet June 25, 2009
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 LLC 2006, 2007, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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