ISL8013 Datasheet, PDF (1/16 Pages) Intersil Corporation – 3A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator

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Data Sheet
December 27, 2007
ISL8013
FN6309.1
3A Low Quiescent Current 1MHz High
Efficiency Synchronous Buck Regulator
The ISL8013 is a high efficiency, monolithic, synchronous
step-down DC/DC converter that can deliver up to 3A
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 ISL8013 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 400mV dropout
voltage at 3A output current. High 1MHz pulse-width
modulation (PWM) switching frequency allows the use of
small external components and SYNC input enables multiple
ICs to synchronize out of phase to reduce ripple and
eliminate beat frequencies.
The ISL8013 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 hiccup mode 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 ISL8013 is offered in a space saving 4x4 QFN lead free
package with exposed pad lead frames for low thermal
resistance.
The ISL8013 includes 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 300mV dropout
voltage at 3A.
The ISL8013 offers a 1ms Power Good (PG) timer at
power-up. When shutdown, ISL8013 discharges the output
capacitor. Other features include internal soft-start, internal
compensation, overcurrent protection, and thermal
shutdown.
The ISL8013 is offered in a 4mmx4mm 16 Ld QFN package
with 1mm maximum height. The complete converter
occupies less than 0.4in² area.
Features
• High Efficiency Synchronous Buck Regulator with up to
97% Efficiency
• Power-Good (PG) Output with a 1ms Delay
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 3A Output Current
• Start-up with Pre-Biased Output
• Internal Soft-Start - 1ms
• Soft-Stop Output Discharge During Disabled
• 35µA Quiescent Supply Current in PFM Mode
• Selectable Forced PWM Mode and PFM Mode
• External Synchronization up to 4MHz
• 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 16 Ld 4mmx4mm QFN
• 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
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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