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ISL8012 Datasheet PDF : 17 Pages
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DATASHEET
ISL8012
2A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator
FN6616
Rev 2.00
December 1, 2011
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
• 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 AN1360 for “ISL8012EVAL1Z: 2A Synchronous Buck
Regulator with Integrated MOSFETs”
FN6616 Rev 2.00
December 1, 2011
Page 1 of 17
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