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ISL6228 Datasheet Download - Intersil Corporation

Номер произв ISL6228
Описание High-Performance Dual-Output Buck Controller
Производители Intersil Corporation
логотип Intersil Corporation логотип 



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ISL6228 Даташит, Описание, Даташиты
®
Data Sheet
May 7, 2008
ISL6228
FN9095.2
High-Performance Dual-Output Buck
Controller for Notebook Applications
The ISL6228 IC is a dual channel 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 diodes result in fewer
components and smaller implementation area.
Intersil’s R3 technology combines the best features of fixed-
frequency and hysteretic PWMs 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, each channel of the ISL6228 has an error amplifier
that provides ±1% voltage regulation at the FB pin.
The ISL6228 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 ISL6228
operates in continuous-conduction-mode (CCM) in heavy
load, and in diode-emulation-mode (DEM) in light load to
improve light-load efficiency. In CCM, the controller always
operates as a synchronous rectifier. In DEM, the low-side
MOSFET is permitted to stay off, blocking negative current
flow into the low-side MOSFET from the output inductor.
Pinout
ISL6228 (28 LD 4x4 TQFN)
28 27 26 25 24 23 22
FSET2 1
VIN2 2
VCC2 3
VCC1 4
VIN1 5
FSET1 6
PGOOD1 7
GND
21 BOOT2
20 PVCC2
19 LGATE2
18 PGND2
17 PGND1
16 LGATE1
15 PVCC1
8 9 10 11 12 13 14
Features
• High performance R3 technology
• Fast transient response
• ±1% regulation accuracy: -40°C to +100°C
• Individual power stage input rail for each channel
• Wide input voltage range: +3.3V to +25V
• Output voltage range: +0.6V to +5V
• 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
• Fault protection
- Undervoltage protection
- Soft crowbar overvoltage protection
- Inductor DCR overcurrent protection
- Over-temperature protection
- Fault identification by PGOOD pull-down resistance
• Pb-free (RoHS compliant)
Applications
• General purpose switching buck regulators
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adaptor
Ordering Information
PART NUMBER PART
TEMP
(Note)
MARKING (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL6228HRTZ 6228HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4A
ISL6228HRTZ-T* 6228HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4A
Tape and Reel
ISL6228IRTZ 6228IRTZ -40 to +100 28 Ld 4x4 TQFN L28.4x4A
ISL6228IRTZ-T* 6228IRTZ -40 to +100 28 Ld 4x4 TQFN L28.4x4A
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.
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. 2007, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.







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ISL6228 Даташит, Описание, Даташиты
ISL6228
PWM CONTROL
2 FN9095.2
May 7, 2008







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ISL6228 Даташит, Описание, Даташиты
Typical Application
ISL6228
RPGOOD2
RPVCC2
RVCC2
PGOOD2
VIN2
3.3V TO 25V
CIN2
CPVCC2
CVCC2
QHIGH_SIDE2
VO2
0.6V TO 5V
CO2
LO2
CBOOT2
CSEN2
QLOW_SIDE2
ROCSET2
RFB2
CFB2
RTOP2
RO2
RBOTTOM2
RFSET2
CFSET2
VCC2
PVCC2
VCC1
PVCC1
PGOOD2
PGOOD1
VIN2
VIN1
UGATE2
BOOT2
UGATE1
BOOT1
PHASE2
PHASE1
ISL6228
LGATE2
PGND2
OCSET2
VO2
LGATE1
PGND1
OCSET1
VO1
FB2
FSET2
FB1
FSET1
RVCC1
RPVCC1
RPGOOD1
5V
CVCC1
CPVCC1
QHIGH_SIDE1
PGOOD1
VIN1
3.3V TO 25V
CIN1
CBOOT1
LO1
QLOW_SIDE1
CSEN1
ROCSET1
VO1
0.6V TO 5V
CO1
RO1
RTOP1
RFB1
CFB1
CFSET1
RBOTTOM1
RFSET1
EN2
GND
EN1
3 FN9095.2
May 7, 2008










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