ISL8014A Datasheet, PDF (1/15 Pages) Intersil Corporation – 4A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator

4A Low Quiescent Current 1MHz High Efficiency
Synchronous Buck Regulator
ISL8014A
The ISL8014A is a high efficiency, monolithic,
synchronous step-down DC/DC converter that can
deliver up to 4A continuous output current from a 2.8V 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 ISL8014A 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 4A 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 ISL8014A 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 ISL8014A is offered in a space saving 4x4 QFN lead
free package with exposed pad lead frames for low
thermal.
The ISL8014A offers a 1ms Power-Good (PG) timer at
power-up. When shutdown, ISL8014A discharges the
output capacitor. Other features include internal
soft-start, internal compensation, overcurrent protection,
and thermal shutdown.
The ISL8014A is offered in a 16 Ld 4mmx4mm 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
• 2.8V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 4A Output Current
• Pin Compatible to ISL8013A
• 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*(see page 14)
• 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
December 4, 2009
FN7525.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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