ISL8012 Datasheet, PDF (1/15 Pages) Intersil Corporation – 2A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator

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Data Sheet
March 11, 2008
ISL8012
FN6616.0
2A Low Quiescent Current 1MHz High
Efficiency Synchronous Buck Regulator
The ISL8012 is a high efficiency, monolithic, synchronous
step-down DC/DC converter that can deliver up to 2A
continuous output current from a 2.7V to 5.5V input supply. It
uses a current control architecture to deliver very low duty
cycle operation at high frequency with fast transient
response and excellent loop stability.
The ISL8012 integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The
100% duty-cycle operation allows less than 240mV dropout
voltage at 2A output current. High 1MHz pulse-width
modulation (PWM) switching frequency allows the use of
small external components.
The ISL8012 can be configured for discontinuous or forced
continuous operation at light load. Forced continuous
operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal current limiting during
short circuit and overcurrent conditions, an output over
voltage comparator and over-temperature monitor circuit. A
power good output voltage monitor indicates when the
output is in regulation.
The ISL8012 offers a 1ms Power Good (PG) timer at
power-up. When shutdown, ISL8012 discharges the output
capacitor. Other features include internal soft-start, internal
compensation, overcurrent protection, and thermal
shutdown.
The ISL8012 is offered in a space saving 3mmx3mm 10 Ld
DFN package lead free package with exposed pad lead
frames for low thermal. The complete converter occupies
less than 0.35in² area.
Ordering Information
PART
NUMBER
(Note)
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL8012IRZ* 012Z
-40 to +85 10 Ld 3x3 DFN L10.3x3C
*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.
Features
• High Efficiency Synchronous Buck Regulator with up to
95% Efficiency
• Power-Good (PG) Output with a 1ms Delay
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 2A Guaranteed Output Current
• Start-up with Pre-Biased Output
• Internal Soft-Start - 1ms
• Soft-Stop Output Discharge During Disabled
• 40µA Quiescent Supply Current in PFM Mode
• Selectable Forced PWM Mode and PFM Mode
• Less than 1µA Logic Controlled Shutdown Current
• 100% Maximum Duty Cycle
• Internal Current Mode Compensation
• Peak Current Limiting and Hiccup Mode Short Circuit
Protection
• Over-Temperature Protection
• 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
• Portable Instruments
• Test and Measurement Systems
• Li-ion Battery Powered Devices
• Small Form Factor (SFP) Modules
• Bar Code Readers
Pinout
ISL8012
(10 LD DFN)
TOP VIEW
VIN 1
VCC 2
EN 3
PG 4
MODE 5
10 LX
9 PGND
8 SGND
7 VFB
6 RSI
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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