ISL6521 Datasheet, PDF (1/13 Pages) Intersil Corporation – PWM Buck DC-DC and Triple Linear Power Controller

®
Data Sheet
February 8, 2005
ISL6521
FN9148.2
PWM Buck DC-DC and Triple Linear
Power Controller
The ISL6521 provides the power control and protection for
four output voltages in low-voltage, high-performance
applications. The IC integrates a voltage-mode PWM
controller and three linear controllers, as well as monitoring
and protection functions into a 16-lead SOIC package. The
PWM controller is intended to regulate the low voltage
supply that requires the greatest amount of current (usually
the core voltage for the FPGA, ASIC, or processor) with a
synchronous rectified buck converter. The linears are
intended to regulate other system voltages, such as I/O
(input/output) and memory circuits. Both the switching
regulator and linear voltage reference provide ±2% of static
regulation over line, load, and temperature ranges. All
outputs are user-adjustable by means of an external resistor
divider. All linear controllers can supply up to 120mA with no
external pass devices. Employing bipolar NPNs for the pass
transistors, the linear regulators can achieve output currents
of 3A or higher with proper device selection.
The ISL6521 monitors all the output voltages. The PWM
controller’s adjustable overcurrent function monitors the
output current by using the voltage drop across the upper
MOSFET’s r_DS(ON). The linear regulator outputs are
monitored via the FB pins for undervoltage events.
Ordering Information
PKG.
PART NUMBER TEMP. RANGE (°C) PACKAGE DWG. #
ISL6521CBZ
(Note)
0 to 70
16 Ld SOIC M16.15
(Pb-free)
ISL6521CBZ-T
(Note)
0 to 70
16 Ld SOIC M16.15
(Pb-free)
ISL6521IBZ
(Note)
-40 to 85
16 Ld SOIC M16.15
(Pb-free)
ISL6521IBZ-T
(Note)
-40 to 85
16 Ld SOIC M16.15
(Pb-free)
ISL6521EVAL1 Evaluation Board
NOTE: Intersil Pb-free 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-020C.
Features
• Provides 4 Regulated Voltages
- Switching Regulator 20A Capable
- Three Linear Regulators
- Capable of 120mA
- Capable of up to 3A with an External Transistor
• Externally Resistor-Adjustable Outputs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
- All Outputs: ±2% Over Temperature
• Overcurrent Fault Monitors
- Switching Regulator Does Not Require Extra Current
Sensing Element, Uses MOSFET’s r_DS(ON)
• Small Converter Size
- 300kHz Constant Frequency Operation
- Small External Component Count
• Commercial and Industrial Temperature Range Support
• Pb-free Available (RoHS Compliant)
Applications
• _{FPGA and} PowerPC^™_{-based boards}
• General purpose, low voltage power supplies
Related Literature
• Technical Support Document AG0001, “Power
Management Application Guide for Xilinx FPGAs”
• Technical Support Document AG0002, “Power
Management Application Guide for Altera FPGAs”
• Technical Support Document AG0005, “Power
Management Application Guide for Actel FPGAs”
Pinout
ISL6521 (SOIC)
TOP VIEW
DRIVE2 1
FB2 2
FB 3
COMP 4
GND 5
PHASE 6
BOOT 7
UGATE 8
16 FB3
15 DRIVE3
14 FB4
13 DRIVE4
12 OCSET
11 VCC
10 LGATE
9 PGND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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