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ISL8112 Datasheet

  • ISL8112

  • Intersil Corporation [High Light-Load Efficiency, Dual-Outp...

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  • INTERSIL   INTERSIL

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ISL8112
Data Sheet
November 21, 2006
FN6396.0
High Light-Load Efficiency, Dual-Output,
Main Power Supply Controllers
ISL8112 is a dual-output Synchronous Buck controller with 2A
integrated driver. It features high light load efficiency which is
especially preferred in systems concerned with high efficiency
in wide load range, like the battery powered system. ISL8112
includes two constant on-time PWM controllers. Either of the
two outputs can operate in output fixed mode or adjustable
mode. In fixed mode, one output can be 5V or 3.3V and the
other can output 1.5V or 1.05V. In output adjustable mode,
one output can be 0.7V to 5.5V, and the other output can
range from 0V to 2.5V (sensing output voltage directly) or up
to 5V (using resistor divider voltage for voltage sensing). This
device also features a linear regulator providing 3.3V/5V, or
adjustable from 0.7V to 4.5V via LDOREF. The linear
regulator provides up to 100mA output current with automatic
linear-regulator bootstrapping to the BYP input. When in
switch over, the LDO output can source up to 200mA.
ISL8112 includes on-board power-up sequencing, the power-
good (PGOOD_) outputs, digital soft-start, and internal soft-
stop output discharge that prevents negative voltages on
shutdown.
ISL8112 is implemented with constant on-time PWM control
scheme which need no sense resistors and provides 100ns
response to load transients while maintaining a relatively
constant switching frequency. The unique ultrasonic pulse-
skipping mode maintains the switching frequency above
25kHz, eliminating undesired audible noises in low frequency
operation at light load. Other features include pulse skipping
which maximizes efficiency in light-load applications, and
fixed-frequency PWM mode which reduces RF interference in
sensitive applications.
Features
鈥?Wide Input Voltage Range 5.5V to 25V
鈥?Constant ON-TIME Control with 100ns Load-Step
Response
鈥?Dual Fixed Outputs of 1.05V (3.3V) and 1.5V (5.0V), or
Adjustable Outputs of 0.7V to 5.5V (SMPS1) and 0V to
2.5V/5V (SMPS2), 卤1.5% Accuracy
鈥?Adjustable Switching Frequency: 400/500kHz,
300/400kHz, 200/300kHz
鈥?Very High Light Load Efficiency (Skip Mode)
鈥?5mW Quiescent Power Dissipation
鈥?卤1.5% (LDO): 100mA, 200mA (Switch Over)
鈥?3.3V Reference Voltage 卤2.0%: 5mA
鈥?2.0V Reference Voltage 卤1.0%: 50碌A
鈥?Temperature Compensated r
DS(ON)
Current Sensing
鈥?Programmable Current Limit with Foldback Capability
鈥?Selectable PWM, Skip or Ultrasonic Mode
鈥?Independent PGOOD1 and PGOOD2 Comparators
鈥?Soft-Start with Pre-Biased Output and Soft-Stop
鈥?1.7ms Digital Soft-Start and Independent Shutdown
鈥?Independent ENABLE
鈥?Thermal Shutdown
鈥?Extremely Low Components Count
鈥?Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
PART
NUMBER
ISL8112IRZ
(Note)
PART
MARKING
TEMP. (掳C)
PACKAGE
PKG.
DWG. #
L32.5x5B
Applications
鈥?Power Supply for Telecom/Datacom and POL
鈥?System Requiring High Efficiency in Wide Load Range
鈥?Compact Design with Minimum Components Count
鈥?PDAs and Mobile Communication Devices
鈥?3- and 4-Cell Li+ Battery-Powered Devices
鈥?DDR1, DDR2, and DDR3 Applications
ISL8112 IRZ -40 to +100 32 Ld QFN
(Pb-free)
L32.5x5B
ISL8112IRZ-T ISL8112 IRZ -40 to +100 32 Ld QFN
(Note)
(Pb-free)
(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. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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