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ISL8501
Data Sheet
July 12, 2007
FN6500.1
Triple Output Controller with 1A Standard
Buck PWM and Dual LDOs
The ISL8501 is a high-performance, triple output controller
that provides a single, high frequency power solution for a
variety of point of load applications. The ISL8501 integrates
a 1A standard buck PWM controller and switching MOSFET
with two 500mA LDOs.
The PWM controller in the ISL8501 drives an internal
switching N-Channel power MOSFET and requires an
external Schottky diode to generate an output voltage from
0.6V to 20V. The integrated power switch is optimized for
excellent thermal performance up to 1A of output current.
The standard buck input voltage range supports a fixed 5V
or variable 6V to 25V range. The PWM regulator switches at
a fixed frequency of 500kHz and utilizes simple voltage
mode control with input voltage feed forward to provide
flexibility in component selection and minimize solution size.
Protection features include overcurrent, undervoltage, and
thermal overload protection integrated into the IC. The
ISL8501 power good signal output indicates loss of
regulation on the PWM output.
The ISL8501 features two adjustable LDO regulators using
internal PMOS transistors as pass devices. Separate enable
pins (EN_LDO1, EN_LDO2) control each LDO output. A
single power good signal output indicates loss of regulation
on either of the two LDO outputs. Independent overcurrent
and thermal fault shutdown monitors are integrated into the
LDO section.
ISL8501 is available in a small 4mmx4mm Quad Flat No-
Lead (QFN) package.
Ordering Information
PART
Features
? Standard Buck Controller with Integrated Switching Power
MOSFET and Dual LDOs
? Integrated Boot Diode
? Input Voltage Range
- Fixed 5V ±10%
- Variable 6V to 25V
? PWM Output Voltage Adjustable from 0.6V to 20V with
Continuous Output Current up to 1A
? Voltage Mode Control with Voltage Feed Forward
? Fixed 500kHz Switching Frequency
? Externally Adjustable Soft-Start Time
? Output Undervoltage Protection
? Dual LDO Adjustable Options
- LDO1, 0.6V to 4.2V . . . . . . . . . . . . . . . . . . . . . . 500mA
- LDO2, 0.6V to 4.2V . . . . . . . . . . . . . . . . . . . . . . 500mA
? Individual Enable Inputs
? Two PGOOD Outputs (PWM and both LDOs)
? Overcurrent Protection
? Thermal Overload Protection
? Internal 5V LDO regulator
? Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
? General Purpose
? WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-
Compact Flash Cards
? Hand-Held Instruments
Pinout
ISL8501
(24 LD QFN)
NUMBER
PART
TEMP.
PACKAGE
PKG.
TOP VIEW
(Note)
MARKING RANGE (°C)
(Pb-free)
DWG. #
ISL8501IRZ* 85 01IRZ
-40 to +85 24 Ld 4x4 QFN L24.4x4D
*Add “-T” suffix for tape and reel
24
23
22
21
20
19
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
FB_LDO1 1
VOUT1 2
18 VIN
17 VIN
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.
VIN_LDO1 3
VIN_LDO2 4
VOUT2 5
FB_LDO2 6
25
GND
16 PHASE
15 PHASE
14 BOOT
13 PVCC
7
8
9
10
11
12
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 registered trademark of Intersil Americas Inc.
Copyright ? Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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