ISL78214 Datasheet, PDF (1/15 Pages) Intersil Corporation – 4A Low Quiescent Current High Efficiency Synchronous Buck Regulator

4A Low Quiescent Current High Efficiency
Synchronous Buck Regulator
ISL78214
The ISL78214 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 ISL78214 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, that
can be synchronization up to 4MHz with an external
clock, 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 ISL78214 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 overvoltage comparator and
over-temperature monitor circuit. A power good output
voltage monitor indicates when the output is in
regulation.
The ISL78214 is offered in a space saving 4x4 QFN lead
free package with exposed pad lead frames for low
thermal.
The ISL78214 offers a 1ms Power-Good (PG) timer at
power-up. When shutdown, ISL78214 discharges the
output capacitor. Other features include internal
soft-start, internal compensation, overcurrent protection,
and thermal shutdown.
The ISL78214 is offered in a 16 Ld 4mmx4mm QFN
package with 1mm maximum height. The complete
converter occupies less than 0.4in² area.
The ISL78214 is both AEC-Q100-rated and fully
TS16949-compliant. The ISL78214 is rated for the
automotive temperature range (-40°C to +105°C).
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
• 2% Output Accuracy Over-Temperature/Load/Line
• 4A Output Current
• Pin Compatible to ISL78213
• 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)
• TS16949 Compliant
• AECQ100 Tested
Applications*(see page 14)
• Automotive Power
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
Related Literature*(see page 14)
• See AN1366, “ISL8014AEVAL2Z: 4A Low Quiescent
Current 1MHz High Efficiency Synchronous Buck
Regulator”
March 8, 2010
FN7551.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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