ISL8502 Datasheet, PDF (1/19 Pages) Intersil Corporation – 2A Synchronous Buck Regulator with Integrated MOSFETs

®
Data Sheet
June 29, 2010
ISL8502
FN6389.2
2A Synchronous Buck Regulator with
Integrated MOSFETs
The ISL8502 is a synchronous buck controller with internal
MOSFETs packaged in a small 4mmx4mm QFN package.
The ISL8502 can support a continuous load of 2A and has a
very wide input voltage range. With the switching MOSFETs
integrated into the IC, the complete regulator footprint can
be very small and provide a much more efficient solution
than a linear regulator.
The ISL8502 is capable of stand alone operation or it can be
used in a master slave combination for multiple outputs that
are derived from the same input rail. Multiple slave channels
(up to six) can be synchronized. This method minimizes the
EMI and beat frequencies effect with multi-channel
operation.
The switching PWM controller drives two internal N-Channel
MOSFETs in a synchronous-rectified buck converter
topology. The synchronous buck converter uses
voltage-mode control with fast transient response. The
switching regulator provides a maximum static regulation
tolerance of ±1% over line, load, and temperature ranges.
The output is user-adjustable by means of external resistors
down to 0.6V.
The output is monitored for undervoltage events. The
switching regulator also has overcurrent protection. Thermal
shutdown is integrated. The ISL8502 features a bi-directional
Enable pin that allows the part to pull the enable pin low
during fault detection.
Pinout
ISL8502
(24 LD QFN)
TOP VIEW
24 23 22 21 20 19
PGOOD 1
18 VIN
SGND 2
17 PHASE
EN 3
SYNCH 4
GND
25
16 PHASE
15 PHASE
M/S 5
14 PHASE
FS 6
13 PGND
7 8 9 10 11 12
Features
• Up to 2A Continuous Output Current
• Integrated MOSFETs for Small Regulator Footprint
• Adjustable Switching Frequency, 500kHz to 1.2MHz
• Tight Output Voltage Regulation, ±1% Over-Temperature
• Wide Input Voltage Range, 5V ±10% or 5.5V to 14V
• Wide Output Voltage Range, from 0.6V
• Simple Single-Loop Voltage-Mode PWM Control Design
• Input Voltage Feed-Forward for Constant Modulator Gain
• Fast PWM Converter Transient Response
• Lossless r_DS(ON) High Side and Low Side Overcurrent
Protection
• Undervoltage Detection
• Integrated Thermal Shutdown Protection
• Power-Good Indication
• Adjustable Soft-Start
• Start-Up with Pre-Bias Output
• Pb-free (RoHS Compliant)
Applications
• _{Point of Load Applications}
• _{Graphics Cards - GPU and Memory Supplies}
• ASIC Power Supplies
• Embedded Processor and I/O supplies
• DSP Supplies
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL8502IRZ* 85 02IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4D
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: 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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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