ISL6521CBZ-T Intersil, ISL6521CBZ-T Datasheet

IC CTRLR PWM BUCK DC/DC 16-SOIC

ISL6521CBZ-T

Manufacturer Part Number
ISL6521CBZ-T
Description
IC CTRLR PWM BUCK DC/DC 16-SOIC
Manufacturer
Intersil
Datasheet

Specifications of ISL6521CBZ-T

Pwm Type
Voltage Mode
Number Of Outputs
4
Frequency - Max
325kHz
Duty Cycle
100%
Voltage - Supply
4.5 V ~ 5.5 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
325kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
monitored via the FB pins for undervoltage events.
Ordering Information
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.
ISL6521CBZ
(Note)
ISL6521CBZ-T
(Note)
ISL6521IBZ
(Note)
ISL6521IBZ-T
(Note)
ISL6521EVAL1
PART NUMBER
DS(ON)
Evaluation Board
TEMP. RANGE (°C)
. The linear regulator outputs are
-40 to 85
-40 to 85
0 to 70
0 to 70
®
1
Data Sheet
16 Ld SOIC
(Pb-free)
16 Ld SOIC
(Pb-free)
16 Ld SOIC
(Pb-free)
16 Ld SOIC
(Pb-free)
PACKAGE
M16.15
M16.15
M16.15
M16.15
DWG. #
PKG.
1-888-INTERSIL or 321-724-7143
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Provides 4 Regulated Voltages
• Externally Resistor-Adjustable Outputs
• Simple Single-Loop Control Design
• Fast PWM Converter Transient Response
• Excellent Output Voltage Regulation
• Overcurrent Fault Monitors
• Small Converter Size
• Commercial and Industrial Temperature Range Support
• Pb-free Available (RoHS Compliant)
Applications
• FPGA and PowerPC
• General purpose, low voltage power supplies
Related Literature
• Technical Support Document AG0001, “Power
• Technical Support Document AG0002, “Power
• Technical Support Document AG0005, “Power
Pinout
- Switching Regulator 20A Capable
- Three Linear Regulators
- Voltage-Mode PWM Control
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
- All Outputs: ±2% Over Temperature
- Switching Regulator Does Not Require Extra Current
- 300kHz Constant Frequency Operation
- Small External Component Count
Management Application Guide for Xilinx FPGAs”
Management Application Guide for Altera FPGAs”
Management Application Guide for Actel FPGAs”
- Capable of 120mA
- Capable of up to 3A with an External Transistor
Sensing Element, Uses MOSFET’s r
February 8, 2005
All other trademarks mentioned are the property of their respective owners.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
DRIVE2
PHASE
UGATE
COMP
BOOT
GND
FB2
FB
Copyright © Intersil Americas Inc. 2004. All Rights Reserved.
1
2
3
4
5
6
7
8
ISL6521 (SOIC)
-based boards
TOP VIEW
16
15
14
13
12
10
11
9
DS(ON)
FB3
DRIVE3
FB4
DRIVE4
OCSET
VCC
LGATE
PGND
ISL6521
FN9148.2

Related parts for ISL6521CBZ-T

ISL6521CBZ-T Summary of contents

Page 1

... MOSFET’ The linear regulator outputs are DS(ON) monitored via the FB pins for undervoltage events. Ordering Information PART NUMBER TEMP. RANGE (°C) ISL6521CBZ SOIC (Note) (Pb-free) ISL6521CBZ SOIC (Note) (Pb-free) ISL6521IBZ - SOIC (Note) (Pb-free) ISL6521IBZ-T - SOIC ...

Page 2

Block Diagram VCC EA3 - DRIVE3 + EA4 x 0.70 + DRIVE4 - + 0.8V - FB4 INHIBIT/SOFT-START + DRIVE2 - EA2 FB2 GND OSCILLATOR FB3 - + UV3 + - UV4 SOFT-START AND FAULT LOGIC + - UV2 + ...

Page 3

Typical Applications High Output Current PWM Converter With Simple Triple Linears Regulators +5V V OUT2 2.5V 120mA + C OUT2 Rs2 V OUT3 1.8V 120mA + C OUT3 Rs3 V OUT4 3.3V 120mA + C OUT4 Rs4 High Output Current ...

Page 4

... Operating Conditions Supply Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±10% Ambient Temperature Range ISL6521CBZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C ISL6521IBZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 85°C Junction Temperature Range -40°C to 125°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied ...

Page 5

Functional Pin Descriptions VCC (Pin 11) Provide a well decoupled 5V bias supply for the IC to this pin. This pin also provides the gate bias charge for the lower MOSFET controlled by the PWM section of the IC, as ...

Page 6

As the internal soft-start voltage increases, the pulse-width on the PHASE pin increases to reach its steady-state duty cycle at time T2. Also at time T2, the error amplifier references of the linear controllers, ...

Page 7

The OC trip point varies with MOSFET’s r temperature variations. To avoid overcurrent tripping in the normal operating load range, determine the R resistor from the equation above with: 1. The maximum r at the highest junction temperature. DS(ON) 2. ...

Page 8

V DRIVER1 OSC PWM COMP SYNC - DRIVER + ∆ V OSC E/A 0.8V ERROR AMP DETAILED COMPENSATION COMPONENTS COMP ISL6521 0.8V FIGURE 5. VOLTAGE-MODE BUCK CONVERTER ...

Page 9

The diode should be placed as close to the FB pin as possible to minimize stray capacitance to this pin. Upon turn-off of the pull-up device, the respective output undergoes a soft-start cycle, bringing the output ...

Page 10

Component Selection Guidelines Output Capacitor Selection The output capacitors for each output have unique requirements. In general, the output capacitors should be selected to meet the dynamic load regulation requirements. Additionally, the PWM converters require an output capacitor to filter ...

Page 11

Transistors Selection/Considerations The ISL6521 can employ external transistors. Two N-channel MOSFETs are used in the synchronous-rectified buck topology of PWM converter. The linear controllers can each drive an NPN bipolar transistor as a pass element. All these ...

Page 12

... Sumida CDEP134 15A 1.6µH Sumida CDEP134 20A 0.5µH Pulse PG0006.601 12 ISL6521 Intersil’s portfolio of multiple output controllers continues to expand with new selections to better fit our customer’s ), the needs. Refer to our website for updated information: I/O ) www.intersil.com MEMORY + C1 ...

Page 13

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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