DATASHEET
ISL8502A
2A Synchronous Buck Regulator with Integrated MOSFETs
The ISL8502A is a synchronous buck controller with internal
MOSFETs packaged in a small 4mmx4mm QFN package. The
ISL8502A 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 ISL8502A 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 ISL8502A features a bi-directional Enable pin
that allows the part to pull the enable pin low during fault
detection.
PGOOD delay for ISL8502A has been decreased to 1ms typical
(at 500kHz switching frequency) compared to 250ms (at
500kHz) for ISL8502.
FN7940
Rev 0.00
October 21, 2011
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
Protections
• 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
V
IN
4.5V TO 5.5V
POWER GOOD
ENABLE
PGOOD
EN
SYNCH
M/S
VCC
PVCC
SS
VIN
+
V
IN
5.5V TO 14V
POWER GOOD
ENABLE
PGOOD
EN
PVCC
VCC
SS
ISL8502A
PHASE
SYNCH
M/S
FS
SGND
PGND
FB
COMP
+
VIN
BOOT
V
OUT
+
BOOT
ISL8502A
PHASE
PGND
+
V
OUT
FS
FB
SGND
COMP
FIGURE 1. STAND-ALONE REGULATOR: V
IN
5.5V TO 14V
FIGURE 2. STAND-ALONE REGULATOR: V
IN
4.5V TO 5.5V
FN7940 Rev 0.00
October 21, 2011
Page 1 of 20
ISL8502A
Pin Configuration*
ISL8502A
(24 LD QFN)
TOP VIEW
VCC
BOOT
PVCC
VIN
VIN
20
VIN
19
18 VIN
17 PHASE
GND
25
16 PHASE
15 PHASE
14 PHASE
13 PGND
7
COMP
8
FB
9
SS
10
PGND
11
PGND
12
PGND
24
PGOOD
SGND
EN
SYNCH
M/S
FS
1
2
3
4
5
6
23
22
21
*See “Functional Pin Descriptions” beginning on page 13 for pin descriptions.
Ordering Information
PART
NUMBER
(Note 2)
ISL8502AIRZ (Notes 1, 3)
ISL8502AEVAL1Z
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL8502A.
For more information on MSL please see
Tech Brief
TB363.
PART
MARKING
85 02AIRZ
Evaluation Board
TEMP. RANGE
(°C)
-40 to +85
PACKAGE
(Pb-free)
24 Ld 4x4 QFN
PKG. DWG. #
L24.4x4D
FN7940 Rev 0.00
October 21, 2011
Page 3 of 20
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