ISL78214_15 Datasheet, PDF (1/15 Pages) Intersil Corporation – 4A Low Quiescent Current High Efficiency Synchronous Buck Regulator

DATASHEET
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 AEC-Q100 qualified. 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 prebiased output
• Internal soft-start - 1ms
• Soft-stop output discharge during disable
• 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)
• AEC-Q100 qualified
Applications
• Automotive power
• DC/DC POL modules
• µC/µP, FPGA and DSP power
Related Literature
• AN1366, “ISL8014AEVAL2Z: 4A Low Quiescent Current
1MHz High Efficiency Synchronous Buck Regulator”
May 12, 2015
FN7551.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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