1
Application Note 1360
ISL8012EVAL1Z: 2A Synchronous Buck Regulator
with Integrated MOSFETs
2A Low Quiescent Current 1MHz
High Efficiency Synchronous Buck
Regulator
ISL8012 is an integrated power controller rate for the 2A,
1MHz step-down regulator, which is ideal for any low
power, low-voltage application. It is optimized for
generating low output voltages down to 0.8V. The supply
voltage range is from 2.7V to 5.5V, allowing for the use of
a single Li+ cell, three NiMH cells or a regulated 5V input.
It has a guaranteed minimum output current of 2A.
1MHz pulse-width modulation (PWM) switching
frequency allows using small external components. It has
flexible operation mode selection of forced PWM mode
and PFM mode with as low as 35µA quiescent current for
highest light load efficiency to maximize battery life.
The ISL8012 includes a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to
maximize efficiency and minimize external component
count. 100% duty-cycle operation allows less than
400mV dropout voltage at 2A.
The ISL8012 offers a 1ms Power-On-Reset (PG) timer at
power-up. The timer output can be reset by RSI. When
shutdown, ISL8012 discharges the output capacitor.
Other features include internal digital soft-start, enable
for power sequence, overcurrent protection and thermal
shutdown.
The ISL8012 is offered in a 3mmx3mm 10 Ld DFN
package with 1mm maximum height. The complete
converter occupies less than 1cm
2
area.
Features
• High Efficiency Synchronous Buck Regulator with up
to 95% Efficiency
• 1ms Reset Timer
• Soft Discharge Output Cap During Enable
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 2A Guaranteed Output Current
• 25µA Quiescent Supply Current in PFM Mode
• Selectable Forced PWM Mode and PFM Mode
• Less Than 1µA Logic Controlled Shutdown Current
• 100% Maximum Duty Cycle for Lowest Dropout
• Internal Current Mode Compensation
• Internal Digital Soft-Start
• Peak Current Limiting, Short Circuit Protection
• Over-Temperature Protection
•Enable
• Small 10 Ld 3mmx3mm DFN
• Pb-Free (RoHS Compliant)
Applications
• DC/DC POL Modules
•µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
•PGtable Instruments
• Test and Measurement Systems
Pinout
ISL8012
(10 LD DFN)
TOP VIEW
Ordering Information
PART
NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL8012IRZ 012Z -40 to +85 10 Ld 3x3 DFN L10.3x3C
NOTES:
1. Add “-T” or 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 ISL8012
. For more information on MSL
please see techbrief TB363
.
2
3
4
1
9
8
7
10
VIN
VCC
EN
PG
LX
PGND
SGND
VFB
5
MODE
6
RSI
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, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
November 4, 2009
AN1360.1
