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March 10, 2006
ISL6522
FN9030.8
Buck and Synchronous Rectifier
Pulse-Width Modulator (PWM) Controller
The ISL6522 provides complete control and protection for a
DC-DC converter optimized for high-performance micro-
processor applications. It is designed to drive two N-Channel
MOSFETs in a synchronous rectified buck topology. The
ISL6522 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 ISL6522 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 performance. The resulting PWM duty ratio
ranges from 0–100%.
The ISL6522 protects against overcurrent conditions by
inhibiting PWM operation. The ISL6522 monitors the current
by using the rDS(ON) of the upper MOSFET which eliminates
the need for a current sensing resistor.
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
• Small converter size
- Constant frequency operation
- 200kHz free-running oscillator programmable from
50kHz to over 1MHz
• 14-lead SOIC and TSSOP package and 16-lead 5x5mm
QFN Package
Pinouts
SOIC, TSSOP
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
• 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 plus anneal available (RoHS compliant)
Applications
• Power supply for Pentium®, Pentium Pro, PowerPC® and
AlphaPC™ microprocessors
QFN
TOP VIEW
• High-power 5V to 3.xV DC-DC regulators
• Low-voltage distributed power supplies
16 15 14 13
SS 1
COMP 2
FB 3
EN 4
GND
12 PVCC
11 LGATE
10 PGND
9 BOOT
5678
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 trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, 2002, 2004-2006. All Rights Reserved
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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ISL6522
Ordering Information
PART
NUMBER
PART
TEMP.
MARKING RANGE (°C) PACKAGE
PKG.
DWG. #
ISL6522CB ISL6522CB
0 to 70 14 Ld SOIC M14.15
ISL6522CBZ 6522CBZ
(Note)
0 to 70
14 Ld SOIC
(Pb-free)
M14.15
ISL6522CBZA 6522CBZ
(Note)
0 to 70
14 Ld SOIC
(Pb-free)
M14.15
ISL6522IB ISL6522IB
-40 to 85 14 Ld SOIC M14.15
ISL6522IBZ 6522IBZ
(Note)
-40 to 85 14 Ld SOIC
(Pb-free)
M14.15
ISL6522CV ISL6522CV
0 to 70 14 Ld TSSOP M14.173
ISL6522CVZ ISL6522CVZ
(Note)
0 to 70
14 Ld TSSOP M14.173
(Pb-free)
ISL6522IV ISL6522IV
-40 to 85 14 Ld TSSOP M14.173
ISL6522IVZ ISL6522IVZ
(Note)
-40 to 85 14 Ld TSSOP M14.173
(Pb-free)
Ordering Information (Continued)
PART
NUMBER
PART
TEMP.
MARKING RANGE (°C) PACKAGE
PKG.
DWG. #
ISL6522CR ISL6522CR
0 to 70 16 Ld 5x5 QFN L16.5x5B
ISL6522CRZ ISL6522CRZ
(Note)
0 to 70
16 Ld 5x5 QFN L16.5x5B
(Pb-free)
ISL6522IR ISL6522IR
-40 to 85 16 Ld 5x5 QFN L16.5x5B
ISL6522IRZ ISL6522IRZ
(Note)
-40 to 85 16 Ld 5x5 QFN L16.5x5B
(Pb-free)
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.
Add “-T” for tape and reel.
Typical Application
SS
12V
VCC
MONITOR AND
PROTECTION
RT
OSC
ISL6522
REF
FB + +-
-
COMP
+5V OR +12V
OCSET
EN
BOOT
UGATE
PHASE
PVCC +12V
LGATE
PGND
GND
+VO
2 FN9030.8
March 10, 2006

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Block Diagram
OCSET
FB
COMP
RT
200µA
REFERENCE 0.8VREF
ISL6522
VCC
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 FN9030.8
March 10, 2006

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ISL6522
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, ISL6522C . . . . . . . . . . . . 0°C to 70°C
Ambient Temperature Range, ISL6522I. . . . . . . . . . . .-40°C to 85°C
Junction Temperature Range, ISL6522C. . . . . . . . . . . 0°C to 125°C
Junction Temperature Range, ISL6522I . . . . . . . . . .-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
TSSOP Package (Note 1) . . . . . . . . . .
95
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. SeeTech
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
POWER-ON RESET
Rising VCC Threshold
Falling VCC Threshold
Enable-Input Threshold Voltage
Rising VOCSET Threshold
OSCILLATOR
Free Running Frequency
Total Variation
Ramp Amplitude
REFERENCE
ICC EN = VCC; UGATE and LGATE Open
EN = 0V
VOCSET = 4.5VDC
VOCSET = 4.5VDC
ISL6522C, VOCSET = 4.5VDC
ISL6522I, VOCSET = 4.5VDC
VOSC
ISL6522C, RT = OPEN, VCC = 12
ISL6522I, RT = OPEN, VCC = 12
6k< RT to GND < 200k
RT = OPEN
- 5 - mA
-
50 100
µA
- - 10.4
8.1 -
-
0.8 - 2.0
0.8 - 2.1
- 1.27 -
V
V
V
V
V
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
ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
GBW
- 0.800 -
- 88 -
- 15 -
V
dB
MHz
Slew Rate
GATE DRIVERS
SR COMP = 10pF
- 6 - V/µs
Upper Gate Source
IUGATE VBOOT - VPHASE = 12V, VUGATE = 6V
350 500
-
mA
4 FN9030.8
March 10, 2006

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ISL6522
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
PROTECTION
RUGATE
ILGATE
RLGATE
ISL6522C, ILGATE = 0.3A
ISL6522I, ILGATE = 0.3A
VCC = 12V, VLGATE = 6V
ISL6522C, ILGATE = 0.3A
ISL6522I, ILGATE = 0.3A
- 5.5
- 5.5
300 450
- 3.5
- 3.5
OCSET Current Source
Soft-Start Current
IOCSET
ISS
VOCSET = 4.5VDC
170 200
- 10
MAX
10
7.2
-
6.5
4.5
230
-
UNITS
mA
µA
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
Functional Pin Descriptions
SOIC
and
TSSOP
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
QFN
16 15 14 13
SS 1
COMP 2
FB 3
GND
12 PVCC
11 LGATE
10 PGND
EN 4
9 BOOT
5678
RT
This pin provides oscillator switching frequency adjustment.
By placing a resistor (RT) from this pin to GND, the nominal
200kHz switching frequency is increased according to the
following equation:
Fs 200kHz + 5------R----1-T--0----6-
(RT to GND)
Conversely, connecting a pull-up resistor (RT) from this pin
to VCC reduces the switching frequency according to the
following equation:
Fs 200kHz 4------R----1-T--0----7-
(RT to 12V)
5 FN9030.8
March 10, 2006