ISL6269B
®
Data Sheet
May 30, 2007
FN6280.2
High-Performance Notebook PWM
Features
Controller with Audio-Frequency Clamp
3
• High performance R technology
The ISL6269B 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 and
-40° 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
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Intersil’s R technology combines the best features of fixed-
frequency PWM and hysteretic PWM while eliminating many
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• Selectable diode emulation mode for increased light load
efficiency
of their shortcomings. R technology employs an innovative
modulator that synthesizes an AC ripple voltage signal V ,
R
analogous to the output inductor ripple current. The AC signal
• Programmable PWM frequency: 200kHz to 600kHz
• Pre-biased output start-up capability
• Integrated MOSFET drivers and bootstrap diode
• Internal digital soft-start
V
enters a window comparator where the lower threshold is
R
the error amplifier output V
, and the upper threshold is a
COMP
programmable voltage reference V resulting in generation
W,
of the PWM signal. The voltage reference V sets the steady-
W
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 ISL6269B has an error amplifier that provides
±1% voltage regulation at the FB pin.
• Power good monitor
• PWM minimum frequency above audible spectrum
• Fault protection
- Undervoltage protection
- Soft crowbar overvoltage protection
The ISL6269B 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 ISL6269B
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.
- Low-side MOSFET r
overcurrent protection
- Over-temperature protection
DS(ON)
- Fault identification by PGOOD pull down resistance
• Pb-free plus anneal available (RoHS compliant)
Applications
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
Pinout
• Network adapter
ISL6269B
(16 LD 4x4 QFN)
TOP VIEW
Ordering Information
TEMP
PART NUMBER
(Note)
PART
MARKING
RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
16 15 14 13
ISL6269BCRZ* 62 69BCRZ -10 to +100 16 Ld 4x4 QFN L16.4x4
ISL6269BIRZ* 62 69BIRZ -40 to +100 16 Ld 4x4 QFN L16.4x4
PVCC
LG
1
2
3
4
12
11
VIN
VCC
FCCM
EN
*Add “-T” suffix for tape and reel.
GND
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.
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. 2006, 2007. All Rights Reserved
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