ISL6526, ISL6526A
Data Sheet
April 3, 2014
FN9055.11
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 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
• 0.8V to V
IN
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 r
DS(on)
• Converter can Source and Sink Current
• Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6526: 300kHz
- ISL6526A: 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+ 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 | Copyright Intersil Americas LLC 2001-2005, 2007, 2008, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL6526, ISL6526A
Ordering Information
PART NUMBER
(Notes 2, 3)
ISL6526CBZ
ISL6526CBZ-T (Note 1)
ISL6526ACBZ
ISL6526ACBZ-T (Note 1)
ISL6526CRZ
ISL6526CRZ-T (Note 1)
ISL6526IBZ
ISL6526IBZ-T (Note 1)
ISL6526IRZ
ISL6526IRZ-T (Note 1)
ISL6526IRZ-TK (Note 1)
ISL6526AIRZ
ISL6526AIRZ-T (Note 1)
ISL6526AIRZ-TK (Note 1)
ISL6526EVAL1
ISL6526EVAL2
ISL6526AEVAL1
ISL6526AEVAL2
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL6526, ISL6526A.
For more information on MSL please see tech
brief
TB363.
PART
MARKING
6526CBZ
6526CBZ
6526ACBZ
6526ACBZ
ISL6526 CRZ
ISL6526 CRZ
6526IBZ
6526IBZ
ISL 6526IRZ
ISL 6526IRZ
ISL 6526IRZ
ISL65 26AIRZ
ISL65 26AIRZ
ISL65 26AIRZ
ISL6526 SOIC Evaluation Board
ISL6526 QFN Evaluation Board
ISL6526A SOIC Evaluation Board
ISL6526A QFN Evaluation Board
TEMP
RANGE (°C)
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
-40 to +85
-40 to +85
PACKAGE
14 Ld SOIC (Pb-free)
14 Ld SOIC (Pb-free)
14 Ld SOIC (Pb-free)
14 Ld SOIC (Pb-free)
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN (Pb-free)
14 Ld SOIC (Pb-free)
14 Ld SOIC (Pb-free)
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN (Pb-free)
16 Ld 5x5 QFN (Pb-free)
PKG
DWG. #
M14.15
M14.15
M14.15
M14.15
L16.5x5B
L16.5x5B
M14.15
M14.15
L16.5x5B
L16.5x5B
L16.5x5B
L16.5x5B
L16.5x5B
L16.5x5B
Pinouts
ISL6526, ISL6526A
(14 LD SOIC)
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
OCSET
4
5
NC
6
FB
7
COMP
8
ENABLE
9
NC
CPVOUT
CT1
CT2
1
2
3
12 PHASE
11 VCC
10 CPGND
ISL6526, ISL6526A
(16 LD QFN)
TOP VIEW
UGATE
14
LGATE
BOOT
13
GND
15
16
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FN9055.11
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ISL6526, ISL6526A
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.0V
Absolute Boot Voltage, V
BOOT
. . . . . . . . . . . . . . . . . . . . . . . +15.0V
Upper Driver Supply Voltage, V
BOOT
- V
PHASE
. . . . . . . . . . . +7.0V
Input, Output or I/O Voltage . . . . . . . . . . . GND -0.3V to VCC +0.3V
Thermal Information
Thermal Resistance
θ
JA
(°C/W)
θ
JC
(°C/W)
SOIC Package (Note 4) . . . . . . . . . . . .
67
N/A
QFN Package (Notes 5, 6). . . . . . . . . .
35
5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . see
TB493
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.3V ±10%
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
4.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
5.
θ
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief
TB379.
6. For
θ
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
VCC SUPPLY CURRENT
Nominal Supply
POWER-ON RESET
Rising CPVOUT POR Threshold
Recommended Operating Conditions, unless otherwise noted V
CC
= 3.3V ±5% and T
A
= +25°C.
SYMBOL
TEST CONDITIONS
MIN
(Note 8)
TYP
MAX
(Note 8)
UNITS
I
BIAS
6.1
6.9
7.7
mA
POR
Commercial
Industrial
4.25
4.10
0.3
4.30
4.30
0.6
4.42
4.50
0.9
V
V
V
CPVOUT POR Threshold Hysteresis
OSCILLATOR
Frequency
f
OSC
IC = ISL6526C, Commercial
IC = ISL6526I, Industrial
IC = ISL6526AC, Commercial
IC = ISL6526AI, Industrial
Ramp Amplitude
REFERENCE
Reference Voltage Tolerance
Nominal Reference Voltage
CHARGE PUMP
Nominal Charge Pump Output
Charge Pump Output Regulation
ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
Slew Rate
SOFT-START
Soft-Start Slew Rate
Commercial
Industrial
GBWP
SR
(Note 7)
V
CPVOUT
V
VCC
= 3.3V, No Load
V
REF
ΔV
OSC
275
250
554
524
-
300
300
600
600
1.5
325
340
645
650
-
kHz
kHz
kHz
kHz
V
P-P
-
-
-
0.800
1.5
-
%
V
-
-
5.1
2
-
-
V
%
-
-
-
88
15
6
-
-
-
dB
MHz
V/µs
6.2
6.2
-
-
7.3
7.6
ms
ms
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FN9055.11
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