ISL8012_10 Datasheet, PDF (1/16 Pages) Intersil Corporation – 2A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator

2A Low Quiescent Current 1MHz High Efficiency
Synchronous Buck Regulator
ISL8012
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
overvoltage 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.
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*(see page 15)
• 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
Related Literature*(see page 15)
• See AN1360 for “ISL8012EVAL1Z: 2A Synchronous
Buck Regulator with Integrated MOSFETs”
FN6616.1
March 17, 2010
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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