ISL78236 Datasheet, PDF (1/24 Pages) Intersil Corporation – Dual 3A Current Sharing 2.5MHz High Efficiency Synchronous Buck Regulator

Dual 3A Current Sharing 2.5MHz High Efficiency
Synchronous Buck Regulator
ISL78236
The ISL78236 is a dual output 3A/3A integrated FET buck
regulator for point-of-load power applications. The supply
voltage range is from 2.8V to 6V, allowing for the use of a
single Li+ cell, three NiMH cells or a regulated 3V/5V bus
input. It is optimized for regulating output voltages down to
1.2V. Each channel provides an output current up to 3A which
can be combined to form a single 6A output in current sharing
mode. The two channels operate 180° out-of-phase to reduce
input RMS current and EMI.
The ISL78236 integrates a pair of low ON-resistance P-channel
and N-channel internal MOSFETs to maximize efficiency and
minimize external component count. It can operate up to
100% duty cycle to maximize operating life as battery voltage
drops out. When supplying 3A on each channel, the 100% duty
cycle operation limits the dropout voltage to less than 250mV.
Other features include internal digital soft-start, independent
channel enable for power sequencing, overcurrent protection,
and thermal shutdown.
The ISL78236 is offered in a 24 Ld 4mmx4mm QFN package
with 1mm maximum height. The complete converter occupies
less than 1.5cm² area.
The ISL78236 is AEC - Q100 qualified and is rated for the
automotive temperature range (-40°C to +105°C).
Features
• Dual 3A/3A independent outputs
• 2.5MHz synchronous buck regulator with internal MOSFETs
up to 95% efficiency
• 2% voltage reference accuracy over-temperature
• 6A current sharing mode operation
• Internal or external compensation
• Peak current limiting and hiccup mode short circuit
protection
• Reverse overcurrent protection
• Over-temperature protection shutdown
• AEC - Q100 qualified
Applications
• DSP and embedded processor power supply
• Infotainment system power
• Automotive point of load power
Related Literature
• AN1927, “ISL78236DUALEVAL1Z Dual 3A Low Quiescent
Current High Efficiency Synchronous Buck Regulator”
• AN1928, “ISL78236CRSHEVAL1Z Current Sharing 6A Low
Quiescent Current High Efficiency Synchronous Buck
Regulator”
3V INPUT
LX1
EN1
PG1
EN2
ISL78236
PG2
LX2
1.2V/3A
FPGA OR DSP
POWER
1.5V/3A
ASIC POWER
FIGURE 1. TYPICAL APPLICATION BLOCK DIAGRAM: DUAL OUTPUT
3A/3A BUCK REGULATOR
100
2.5V_OUT
90
80
70
1.2V_OUT
1.5V_OUT
1.8V_OUT
60
50
40
0.0
0.5
1.0
1.5
2.0
OUTPUT LOAD (A)
2.5
3.0
FIGURE 2. EFFICIENCY vs LOAD CURRENT, V_IN = 3.3V, T_A = +25°C
April 28, 2014
1
FN8624.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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