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ISL6527, ISL6527A
Data Sheet
November 18, 2008
FN9056.10
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6527, ISL6527A make simple work out of
implementing a complete control and protection scheme for
a DC/DC step-down converter. Designed to drive N-Channel
MOSFETs in a synchronous buck topology, the ISL6527,
ISL6527A integrate the control, output adjustment,
monitoring and protection functions into a single package.
The ISL6527, ISL6527A provide simple, single feedback loop,
voltage-mode control with fast transient response. The output
voltage can be regulated to as low as the provided external
reference. A fixed frequency oscillator reduces design
complexity, while balancing typical application cost and
efficiency.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate, which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
Protection from overcurrent conditions is provided by
monitoring the r
DS(ON)
of the upper MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
Features
• Operates from 3.3V to 5V Input
• Utilizes an External Reference
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s r
DS(ON)
• Converter Can Source and Sink Current
• Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6527: 300kHz
- ISL6527A: 600kHz
• Internal Soft-Start
• 14 Ld SOIC or 16 Ld 5x5 QFN
• QFN package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip-Scale Package Footprint, which Improves
PCB Efficiency and has a Thinner Profile
• Pb-Free (RoHS compliant)
Applications
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Subsystem Power Supplies
- PCI/AGP/GTL+ Busses
- ACPI Power Control
- DDR SDRAM Bus Termination Supply
• Cable Modems, Set-Top Boxes, and DSL Modems
• DSP and Core Communications Processor Supplies
• Memory Supplies
• Personal Computer Peripherals
• Industrial Power Supplies
• 3.3V Input DC/DC Regulators
• Low Voltage Distributed Power Supplies
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. 2003-2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL6527, ISL6527A
Ordering Information
PART NUMBER
(Note)
ISL6527ACBZ*
ISL6527ACRZ*
ISL6527AIBZ*
ISL6527AIRZ*
ISL6527CBZ*
ISL6527CRZ*
ISL6527IBZ*
ISL6527IRZ*
ISL6527EVAL1
ISL6527EVAL2
ISL6527AEVAL1
ISL6527AEVAL2
PART MARKING
6527ACBZ
ISL6527 ACRZ
6527AIBZ
ISL6527 AIRZ
6527CBZ
ISL6527 CRZ
6527IBZ
ISL6527 IRZ
TEMP
RANGE (°C)
0 to +70
0 to +70
-40 to +85
-40 to +85
0 to +70
0 to +70
-40 to +85
-40 to +85
14 Ld SOIC
16 Ld 5x5 QFN
14 Ld SOIC
16 Ld 5x5 QFN
14 Ld SOIC
16 Ld 5x5 QFN
14 Ld SOIC
16 Ld 5x5 QFN
PACKAGE
(Pb-Free)
PKG
DWG. #
M14.15
L16.5x5B
M14.15
L16.5x5B
M14.15
L16.5x5B
M14.15
L16.5x5B
ISL6527 SOIC Evaluation Board
ISL6527 QFN Evaluation Board
ISL6527A SOIC Evaluation Board
ISL6527A QFN Evaluation Board
*Add “-T” suffix for 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.
Pinouts
ISL6527, ISL6527A
(14 LD SOIC)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
CT1 4
CT2 5
OCSET/SD 6
FB 7
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 REF_IN
8 COMP
CPVOUT 1
CT1 2
CT2 3
OCSET/SD 4
5
NC
6
FB
7
COMP
8
REF_IN
ISL6527, ISL6527A
(16 LD QFN)
TOP VIEW
UGATE
14
LGATE
BOOT
13
12 PHASE
11 VCC
10 CPGND
9
NC
GND
15
16
2
FN9056.10
November 18, 2008
ISL6527, ISL6527A
Typical Application - 3.3V Input
3.3V
V
IN
C
IN
C
BULK
OCSET/SD
R
OCSET
C
PUMP
CT2
CPVOUT
VCC
CT1
ISL6527,
ISL6527A
BOOT
D
BOOT
C
DCPL
C
HF
CPGND
GND
UGATE
PHASE
V
REF
REF_IN
LGATE
COMP
FB
C
BOOT
Q
1
L
OUT
V
OUT
Q
2
C
OUT
C
I
R
FB
R
F
C
F
R
OFFSET
3
FN9056.10
November 18, 2008
ISL6527, ISL6527A
Typical Application - 5V Input
+5V
V
IN
VCC
CT1
OCSET/SD
R
OCSET
CPVOUT
N/C
CT2
C
BULK
ISL6527,
ISL6527A
BOOT
D
BOOT
C
IN
CHF
CPGND
GND
C
BOOT
UGATE
PHASE
Q
1
L
OUT
V
OUT
V
REF
REF_IN
LGATE
COMP
FB
Q
2
C
OUT
C
I
R
FB
R
F
C
F
R
OFFSET
Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET/SD
20μA
CHARGE
PUMP
POWER-ON
RESET (POR)
BOOT
OC
COMPARATOR
+
-
SOFT-START
UGATE
PHASE
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
INHIBIT
REF_IN
GATE
CONTROL
LOGIC
PWM
LGATE
FB
OSCILLATOR
COMP
FIXED 300kHz or 600kHz
GND
4
FN9056.10
November 18, 2008
FPGA/CPLD
