DATASHEET
ISL6522B
Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller
The ISL6522B provides complete control and protection for a
DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive two
N-Channel MOSFETs in a synchronous rectified buck topology.
The ISL6522B integrates all of the control, output adjustment,
monitoring and protection functions into a single package.
The output voltage of the converter can be precisely
regulated to as low as 0.8V, with a maximum tolerance of
1%
over temperature and line voltage variations.
The ISL6522B provides simple, single feedback loop, voltage-
mode control with fast transient response. It includes a 200kHz
free-running triangle-wave oscillator that is adjustable from
below 50kHz to over 1MHz. The error amplifier features a
15MHz gain-bandwidth product and 6V/µs slew rate which
enables high converter bandwidth for fast transient perform-
ance. The resulting PWM duty ratio ranges from 0-100%.
The ISL6522B protects against overcurrent conditions by
inhibiting PWM operation. The ISL6522B monitors the
current by using the r
DS(ON)
of the upper MOSFET which
eliminates the need for a current sensing resistor.
FN9150
Rev 2.00
Aug 10, 2015
Features
• Drives two N-Channel MOSFETs
• Operates from +5V or +12V input
• Simple single-loop control design
- Voltage-mode PWM control
• Fast transient response
- High-bandwidth error amplifier
- Full 0–100% duty ratio
• Excellent output voltage regulation
- 0.8V internal reference
-
1%
over line voltage and temperature
• Overcurrent fault monitor
- Does not require extra current sensing element
- Uses MOSFETs r
DS(ON)
• Converter can source and sink current
• Pre-Biased Load Start Up
• Small converter size
- Constant frequency operation
- 200kHz free-running oscillator programmable from
50kHz to over 1MHz
• 14-lead SOIC package and 16-lead 5x5mm QFN Package
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat
No Leads-Product Outline
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile
• Pb-Free Available (RoHS Compliant)
Pinouts
RT
OCSET
SS
COMP
FB
EN
GND
ISL6522B (SOIC)
TOP VIEW
1
2
3
4
5
6
7
14 VCC
13 PVCC
12 LGATE
11 PGND
10 BOOT
9
8
UGATE
PHASE
Applications
ISL6522B (QFN)
TOP VIEW
OCSET
VCC
• Power supply for Pentium
®
, Pentium Pro, PowerPC
®
and
AlphaPC™ microprocessors
• FPGA Core DC/DC Converters
• Low-voltage distributed power supplies
12 PVCC
11 LGATE
10 PGND
9
BOOT
NC
16
SS 1
COMP 2
FB 3
EN 4
5
NC
15
RT
14
7
PAHSE
13
6
GND
8
UGATE
FN9150 Rev 2.00
Aug 10, 2015
Page 1 of 16
ISL6522B
Ordering Information
PART NUMBER
ISL6522BIBZ*
(See Note)
ISL6522BIRZ*
(See Note)
TEMP.
RANGE (°C)
-40 to 85
-40 to 85
PACKAGE
14 Ld SOIC
(Pb-free)
16 Ld 5x5 QFN
(Pb-free)
PKG.
DWG. #
M14.15
L16.5x5B
*Add “-T*” suffix for tape and reel.
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-020.
FN9150 Rev 2.00
Aug 10, 2015
Page 2 of 16
ISL6522B
Absolute Maximum Ratings
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Boot Voltage, V
BOOT
- V
PHASE
. . . . . . . . . . . . . . . . . . . . . . +15.0V
Input, Output or I/O Voltage . . . . . . . . . . . . GND -0.3V to V
CC
+0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance (Typical, Note 1) . . .
JA
(°C/W)
JC
(°C/W)
SOIC Package (Note 1) . . . . . . . . . . . . . . . . . . . . . 67
n/a
QFN Package (Notes 2, 3). . . . . . . . . . . . . . . . . . . 36
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)
Recommended Operating Conditions
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . +12V
10%
Ambient Temperature Range, ISL6522BC. . . . . . . . . . . 0°C to 70°C
Ambient Temperature Range, ISL6522BI . . . . . . . . . .-40°C to 85°C
Junction Temperature Range, ISL6522BC . . . . . . . . . 0°C to 125°C
Junction Temperature Range, ISL6522BI . . . . . . . . .-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.
NOTES:
1.
JA
is measured with the component mounted on a highs effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2.
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.
3. For
JC
, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
V
CC
SUPPLY CURRENT
Nominal Supply
Shutdown Supply
POWER-ON RESET
Rising V
CC
Threshold
Falling V
CC
Threshold
Enable-Input Threshold Voltage
Recommended Operating Conditions, Unless Otherwise Noted
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
I
CC
EN = V
CC
; UGATE and LGATE Open
EN = 0V
-
-
5
50
-
100
mA
A
V
OCSET
= 4.5VDC
V
OCSET
= 4.5VDC
ISL6522BC, V
OCSET
= 4.5VDC
ISL6522BI, V
OCSET
= 4.5VDC
-
8.1
0.8
0.8
-
-
-
-
-
1.27
10.4
-
2.0
2.1
-
V
V
V
V
V
Rising V
OCSET
Threshold
OSCILLATOR
Free Running Frequency
ISL6522BC, R
T
= OPEN, V
CC
= 12
ISL6522BI, R
T
= OPEN, V
CC
= 12
Total Variation
Ramp Amplitude
REFERENCE
Reference Voltage Tolerance
V
REF
Commercial
Industrial
Reference Voltage
ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
Slew Rate
GBW
SR
COMP = 10pF
V
OSC
6k < R
T
to GND < 200k
R
T
= OPEN
175
160
-20
-
200
200
-
1.9
230
230
+20
-
kHz
%
V
P-P
-1
-2
-
-
-
0.800
+1
+1
-
%
%
V
-
-
-
88
15
6
-
-
-
dB
MHz
V/s
FN9150 Rev 2.00
Aug 10, 2015
Page 4 of 16
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