DATASHEET
ISL6520B
FN9083
Rev 3.00
Jul 23, 2007
Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
The ISL6520B makes simple work out of implementing a
complete control scheme for a DC/DC stepdown converter.
Designed to drive N-channel MOSFETs in a synchronous
buck topology, the ISL6520B integrates the control, output
adjustment and monitoring functions into a single 8 Lead
package.
Features
The ISL6520B provides 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.
• Drives N-Channel MOSFETs
The error amplifier features a 15MHz gain-bandwidth
product and 8V/s slew rate which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
• Operates from +5V Input
• 0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Over Line Voltage and Temperature
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
PART
MARKING
TEMP.
RANGE
(°C)
6520 BCB
0 to +70 8 Ld SOIC
M8.15
• Small Converter Size
- 300kHz Fixed Frequency Oscillator
- Internal Soft Start
- 8 Ld SOIC or 16Ld 4mmx4mm 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
ISL6520BCBZ* 6520 BCBZ 0 to +70 8 Ld SOIC
(Note)
(Pb-free)
M8.15
• Pb-free Plus Anneal Available (RoHS compliant)
Ordering Information
PART
NUMBER
ISL6520BCB*
ISL6520BCR*
65 20BCR
PACKAGE
PKG.
DWG. #
0 to +70 16 Ld 4x4 QFN L16.4x4
ISL6520BCRZ* 65 20BCRZ 0 to +70 16 Ld 4x4 QFN L16.4x4
(Note)
(Pb-free)
ISL6520BIR*
65 20BIR
-40 to +85 16 Ld 4x4 QFN L16.4x4
ISL6520BIRZ* 65 20BIRZ -40 to +85 16 Ld 4x4 QFN L16.4x4
(Note)
(Pb-free)
ISL6520EVAL1 Evaluation Board
*Add “-T” suffix for tape and reel. Please refer to TB347 for details
on reel specifications.
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.
Applications
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
- SSTL-2 and 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
• 5V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
FN9083 Rev 3.00
Jul 23, 2007
Page 1 of 11
ISL6520B
Pinouts
ISL6520B
(16 LD QFN)
TOP VIEW
NC
16
15
14
13
2
11 COMP/SD
GND
3
10 NC
NC
4
9
5
6
7
8
NC
UGATE
VCC
12 NC
NC
1
LGATE
BOOT
5 VCC
LGATE 4
PHASE
7 COMP/SD
6 FB
GND 3
NC
8 PHASE
BOOT 1
UGATE 2
NC
ISL6520B
(8 LD SOIC)
TOP VIEW
FB
Block Diagram
VCC
POR AND
SOFTSTART
BOOT
UGATE
+
0.8V
PWM
COMPARATOR
ERROR
AMP
+
-
INHIBIT
PHASE
-
GATE
CONTROL
LOGIC
PWM
+
-
VCC
FB
LGATE
COMP/SD
20A
OSCILLATOR
FIXED 300kHz
GND
Typical Application
VIN
5V
CDCPL
DBOOT
RPULLUP
VCC
5
COMP/SD
SHUTDOWN
7
2
ISL6520B
RF
CI
CF
6
FB
1
3
8
4
CBULK
CHF
BOOT
CBOOT
QU
UGATE
LOUT
PHASE
QL
LGATE
VOUT
COUT
GND
ROFFSET
RS
FN9083 Rev 3.00
Jul 23, 2007
Page 2 of 11
ISL6520B
Absolute Maximum Ratings
Thermal Information
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.0V
Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . 7.0V (DC)
8.0V (
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