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6269BIRZ Просмотр технического описания (PDF) - Intersil

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6269BIRZ High-Performance Notebook PWM Controller with Audio-Frequency Clamp Intersil
Intersil Intersil
6269BIRZ Datasheet PDF : 14 Pages
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®
Data Sheet
May 30, 2007
ISL6269B
FN6280.2
High-Performance Notebook PWM
Controller with Audio-Frequency Clamp
The ISL6269B 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 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 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 ISL6269B has an error amplifier that provides
±1% voltage regulation at the FB pin.
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.
Pinout
ISL6269B
(16 LD 4x4 QFN)
TOP VIEW
16 15 14 13
VIN 1
12 PVCC
VCC 2
FCCM 3
GND
11 LG
10 PGND
EN 4
9 ISEN
5678
Features
• High performance R3 technology
• Fast transient response
• ±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
• Selectable diode emulation mode for increased light load
efficiency
• Programmable PWM frequency: 200kHz to 600kHz
• Pre-biased output start-up capability
• 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 rDS(ON) overcurrent protection
- Over-temperature protection
- Fault identification by PGOOD pull down resistance
• Pb-free plus anneal available (RoHS compliant)
Applications
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adapter
Ordering Information
PART NUMBER PART
(Note)
MARKING
TEMP
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6269BCRZ* 62 69BCRZ -10 to +100 16 Ld 4x4 QFN L16.4x4
ISL6269BIRZ* 62 69BIRZ -40 to +100 16 Ld 4x4 QFN L16.4x4
*Add “-T” suffix for tape and reel.
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.
1
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
All other trademarks mentioned are the property of their respective owners.
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