ISL78213 Datasheet, PDF (1/15 Pages) Intersil Corporation – 3A Low Quiescent Current, High Efficiency Synchronous Buck Regulator

3A Low Quiescent Current, High Efficiency
Synchronous Buck Regulator
ISL78213
The ISL78213 is a high efficiency, monolithic,
synchronous step-down DC/DC converter that can
deliver up to 3A 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 ISL78213 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 300mV
dropout voltage at 3A output current. High 1MHz
pulse-width modulation (PWM) switching frequency, that
can be synchronized 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 ISL78213 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 ISL78213 is offered in a space saving 4x4 QFN lead
free package with exposed pad lead frames for low
thermal resistance.
The ISL78213 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 ISL78213 offers a 1ms Power Good (PG) timer at
power-up. When shutdown, ISL78213 discharges the
output capacitor. Other features include internal
soft-start, internal compensation, overcurrent protection,
and thermal shutdown.
The ISL78213 is offered in a 4mmx4mm 16 Ld QFN
package with 1mm maximum height. The complete
converter occupies less than 0.4in² area.
The ISL78213 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
• 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)
• 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 AN1365, “ISL8013AEVAL2Z: 3A Low Quiescent
Current 1MHz High Efficiency Synchronous Buck
Regulator”
March 16, 2010
FN7550.1
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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