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®
Data Sheet
April 4, 2005
ISL6522B
FN9150.1
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 rDS(ON) of the upper MOSFET which
eliminates the need for a current sensing resistor.
Pinouts
ISL6522B (SOIC)
TOP VIEW
RT 1
OCSET 2
SS 3
COMP 4
FB 5
EN 6
GND 7
14 VCC
13 PVCC
12 LGATE
11 PGND
10 BOOT
9 UGATE
8 PHASE
ISL6522B (QFN)
TOP VIEW
16 15 14 13
SS 1
COMP 2
FB 3
EN 4
12 PVCC
11 LGATE
10 PGND
9 BOOT
5678
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 rDS(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)
Applications
• Power supply for Pentium®, Pentium Pro, PowerPC® and
AlphaPC™ microprocessors
• FPGA Core DC/DC Converters
• Low-voltage distributed power supplies
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004, 2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
PowerPC® is a trademark of IBM. AlphaPC™ is a trademark of Digital Equipment Corporation. Pentium® is a registered trademark of Intel Corporation.

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ISL6522B
Ordering Information
TEMP.
PART NUMBER RANGE (°C)
PACKAGE
ISL6522BCB*
0 to 70 14 Ld SOIC
ISL6522BCBZ*
(See Note)
0 to 70
14 Ld SOIC
(Pb-free)
ISL6522BCR*
0 to 70 16 Ld 5x5 QFN
ISL6522BCRZ*
(See Note)
0 to 70
16 Ld 5x5 QFN
(Pb-free)
ISL6522BIB*
-40 to 85 14 Ld SOIC
ISL6522BIBZ*
(See Note)
-40 to 85 14 Ld SOIC
(Pb-free)
ISL6522BIR*
-40 to 85 16 Ld 5x5 QFN
ISL6522BIRZ*
(See Note)
-40 to 85 16 Ld 5x5 QFN
(Pb-free)
*Add “-T” suffix for tape and reel.
PKG.
DWG. #
M14.15
M14.15
L16.5x5B
L16.5x5B
M14.15
M14.15
L16.5x5B
L16.5x5B
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.
2

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ISL6522B
Typical Application
12V
VCC
SS MONITOR AND
PROTECTION
ISL6522B
RT OSC
REF
FB
+
-
+-
COMP
+5V OR +12V
OCSET
EN
BOOT
UGATE
PHASE
PVCC +12V
LGATE
PGND
GND
+VO
Block Diagram
VCC
OCSET
FB
COMP
RT
200µA
REFERENCE 0.8VREF
POWER-ON
RESET (POR)
+
- OVER
CURRENT
4V
SOFT-
START
10µA
+
-
ERROR
AMP
PWM
COMPARATOR
+
-
INHIBIT
PWM
GATE
CONTROL
LOGIC
OSCILLATOR
EN
SS
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
GND
3

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ISL6522B
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Boot Voltage, VBOOT - VPHASE . . . . . . . . . . . . . . . . . . . . . . +15.0V
Input, Output or I/O Voltage . . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +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
Thermal Information
Thermal Resistance (Typical, Note 1) . . . θJA(°C/W) θJC(°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)
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 highs 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. See Tech
Brief TB379.
3. For θJC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Recommended Operating Conditions, Unless Otherwise Noted
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
VCC SUPPLY CURRENT
Nominal Supply
Shutdown Supply
ICC EN = VCC; UGATE and LGATE Open
EN = 0V
- 5 - mA
-
50 100
µA
POWER-ON RESET
Rising VCC Threshold
Falling VCC Threshold
Enable-Input Threshold Voltage
Rising VOCSET Threshold
OSCILLATOR
VOCSET = 4.5VDC
VOCSET = 4.5VDC
ISL6522BC, VOCSET = 4.5VDC
ISL6522BI, VOCSET = 4.5VDC
- - 10.4
8.1 -
-
0.8 - 2.0
0.8 - 2.1
- 1.27 -
V
V
V
V
V
Free Running Frequency
Total Variation
Ramp Amplitude
REFERENCE
VOSC
ISL6522BC, RT = OPEN, VCC = 12
ISL6522BI, RT = OPEN, VCC = 12
6k< RT to GND < 200k
RT = OPEN
175 200 230
kHz
160 200 230
-20 - +20 %
- 1.9 - VP-P
Reference Voltage Tolerance
VREF
Commercial
Industrial
-1 - +1 %
-2 - +1 %
Reference Voltage
- 0.800 -
V
ERROR AMPLIFIER
DC Gain
- 88 -
dB
Gain-Bandwidth Product
GBW
- 15 - MHz
Slew Rate
SR COMP = 10pF
- 6 - V/µs
4

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ISL6522B
Electrical Specifications
PARAMETER
Soft START
Soft-Start Current
Peak Soft Start Voltage
GATE DRIVERS
Upper Gate Source
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
PROTECTION
OCSET Current Source
Recommended Operating Conditions, Unless Otherwise Noted (Continued)
SYMBOL
TEST CONDITIONS
MIN TYP
MAX
UNITS
ISS
VSS
IUGATE
RUGATE
ILGATE
RLGATE
VBOOT - VPHASE = 12V, VUGATE = 6V
ISL6522BC, IUGATE = 0.3A
ISL6522BI, IUGATE = 0.3A
VCC = 12V, VLGATE = 6V
ISL6522BC, ILGATE = 0.3A
ISL6522BI, ILGATE = 0.3A
IOCSET VOCSET = 4.5VDC
- 10 -
- 4.5 -
µA
V
350 500
-
- 5.0 8.75
- 5.0 9.25
300 450
-
- 3.2 5.55
- 3.2 5.85
mA
mA
170 200 230
µA
Typical Performance Curves
1000
100
10
RT PULLUP
TO +12V
RT PULLDOWN
TO VSS
10 100
SWITCHING FREQUENCY (kHz)
FIGURE 1. RT RESISTANCE vs FREQUENCY
1000
80
70
60
CGATE = 3300pF
50
40
30 CGATE = 1000pF
20
10 CGATE = 10pF
0
100 200 300 400 500 600 700 800 900 1000
SWITCHING FREQUENCY (kHz)
FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY
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