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®
Data Sheet
ISL6526, ISL6526A
March 20, 2007
FN9055.8
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6526, ISL6526A make simple work out of
implementing a complete control and protection scheme for
a DC/DC stepdown converter. Designed to drive N-Channel
MOSFETs in a synchronous buck topology, the ISL6526,
ISL6526A integrate the control, output adjustment,
monitoring and protection functions into a single package.
The ISL6526, ISL6526A provide simple, single feedback
loop, voltage-mode control with fast transient response. The
output voltage can be precisely regulated to as low as 0.8V,
with a maximum tolerance of ±1.5% over temperature and
line voltage variations. 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 rDS(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
• 0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Over Load, Line Voltage and Temperature
• 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 rDS(on)
• Converter can Source and Sink Current
• Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6526: 300kHz
- ISL6526A: 600kHz
• Internal Soft-Start
• 14 Lead SOIC or 16 Lead 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 Plus Anneal Available (RoHS Compliant)
Applications
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- 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. 2001-2005, 2007. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

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ISL6526, ISL6526A
Ordering Information
PART NUMBER
(Note)
ISL6526CB*
ISL6526CBZ*
ISL6526ACB*
ISL6526ACBZ*
ISL6526CR*
ISL6526CRZ*
ISL6526ACR*
ISL6526ACRZ*
ISL6526IB*
ISL6526IBZ*
ISL6526AIB*
ISL6526AIBZ*
ISL6526IR*
ISL6526IRZ*
PART
MARKING
ISL6526CB
6526CBZ
ISL6526ACB
6526ACBZ
ISL 6526CR
ISL6526 CRZ
ISL 6526ACR
ISL6526 ACRZ
ISL6526IB
6526IBZ
ISL6526AIB
6526AIBZ
ISL 6526IR
ISL 6526IRZ
TEMP
RANGE (°C)
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
14 Ld SOIC
14 Ld SOIC (Pb-free)
14 Ld SOIC
14 Ld SOIC (Pb-free)
16 Ld 5x5 QFN
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN
16 Ld 5x5 QFN (Pb-free)
14 Ld SOIC
14 Ld SOIC (Pb-free)
14 Ld SOIC
14 Ld SOIC (Pb-free)
16 Ld 5x5 QFN
16 Ld 5x5 QFN (Pb-free)
PKG
DWG. #
M14.15
M14.15
M14.15
M14.15
L16.5x5B
L16.5x5B
L16.5x5B
L16.5x5B
M14.15
M14.15
M14.15
M14.15
L16.5x5B
L16.5x5B
ISL6526AIR*
ISL 6526AIR
-40 to +85
16 Ld 5x5 QFN
L16.5x5B
ISL6526AIRZ*
ISL65 26AIRZ
-40 to +85
16 Ld 5x5 QFN (Pb-free)
L16.5x5B
ISL6526EVAL1
ISL6526 SOIC Evaluation Board
ISL6526EVAL2
ISL6526 QFN Evaluation Board
ISL6526AEVAL1
ISL6526A SOIC Evaluation Board
ISL6526AEVAL2
ISL6526A QFN Evaluation Board
*Add “-T” suffix for 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.
Pinouts
ISL6526, ISL6526A
(14 LD SOIC)
TOP VIEW
ISL6526, ISL6526A
(16 LD QFN)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
CT1 4
CT2 5
OCSET 6
FB 7
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 ENABLE
8 COMP
16 15 14 13
CPVOUT 1
CT1 2
CT2 3
OCSET 4
12 PHASE
11 VCC
10 CPGND
9 NC
5678
2 FN9055.8
March 20, 2007

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ISL6526, ISL6526A
Typical Application - 3.3V Input
3.3V
VIN
CIN
CPUMP
DISABLE
VCC
CT1 OCSET
ROCSET
CBULK
CPVOUT
ISL6526, ISL6526A
CT2
CPGND
BOOT
GND
ENABLE
COMP
UGATE
PHASE
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
COUT
Q2
CI
RF CF
ROFFSET
RFB
VOUT
3 FN9055.8
March 20, 2007

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Typical Application - 5V Input
+5V
VIN
ISL6526, ISL6526A
DISABLE
VCC
CT1 OCSET
ROCSET
CPVOUT
ISL6526, ISL6526A
N/C CT2
DBOOT
CPGND
GND
BOOT
UGATE
PHASE
CBOOT
ENABLE
COMP
LGATE
FB
CIN
CBULK
CHF
Q1 LOUT
COUT
Q2
CI
RF CF
ROFFSET
RFB
VOUT
Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET
CHARGE
PUMP
20μA
+
-
OC
COMPARATOR
POWER-ON
RESET (POR)
SOFT-START
+
0.8V
-
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
GATE
CONTROL
PWM LOGIC
FB
COMP
4
OSCILLATOR
FIXED 300kHz or 600kHz
GND
ENABLE
BOOT
UGATE
PHASE
LGATE
FN9055.8
March 20, 2007

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ISL6526, ISL6526A
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.0V
Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . . . . +7.0V
Input, Output or I/O Voltage . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.3V ±10%
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°C
Thermal Information
Thermal Resistance
θJA (°C/W)
θJC (°C/W)
SOIC Package (Note 1) . . . . . . . . . . . .
67
N/A
QFN Package (Note 2). . . . . . . . . . . . .
35
5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . +300°C
(SOIC - Lead Tips Only)
For Recommended soldering conditions see Tech Brief TB389.
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.
NOTES:
1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. θJC, the
“case temp” is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications Recommended Operating Conditions, unless otherwise noted VCC = 3.3V ±5% and TA = +25°C
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
VCC SUPPLY CURRENT
Nominal Supply
POWER-ON RESET
IBIAS
6.1 6.9 7.7
Rising CPVOUT POR Threshold
POR Commercial
4.25 4.30 4.42
Industrial
4.10 4.30 4.50
CPVOUT POR Threshold Hysteresis
0.3 0.6 0.9
OSCILLATOR
Frequency
fOSC
IC = ISL6526C, Commercial
IC = ISL6526I, Industrial
275 300 325
250 300 340
IC = ISL6526AC, Commercial
530 600 645
IC = ISL6526AI, Industrial
510 600 650
Ramp Amplitude
REFERENCE
ΔVOSC
- 1.5 -
Reference Voltage Tolerance
- - 1.5
Nominal Reference Voltage
CHARGE PUMP
VREF
- 0.800 -
Nominal Charge Pump Output
Charge Pump Output Regulation
VCPVOUT VVCC = 3.3V, No Load
- 5.1 -
-2-
ERROR AMPLIFIER
DC Gain
Guaranteed by Design
- 88 -
Gain-Bandwidth Product
GBWP
- 15 -
Slew Rate
SR
-6-
SOFT-START
Soft-Start Slew Rate
Commercial
6.2 - 7.3
Industrial
6.2 - 7.6
UNITS
mA
V
V
V
kHz
kHz
kHz
kHz
VP-P
%
V
V
%
dB
MHz
V/μs
ms
ms
5 FN9055.8
March 20, 2007