DATASHEET
ISL8022
FN7650
Rev 3.00
March 14, 2013
Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck
Regulator
The ISL8022 is a high efficiency, dual synchronous step-down
Features
DC/DC regulator that can deliver up to 2A/1.7A continuous
• Dual 2A/1.7A high efficiency synchronous buck regulator
with up to 97% efficiency, low iq (40µA)
output current per channel. The channels are 180° out-of-
phase for input RMS current and EMI reduction. The supply
voltage range of 2.8V to 5.5V allows for the use of a single Li+
cell, three NiMH cells or a regulated 5V input. The current
mode control architecture enables very low duty cycle
operation at high frequency with fast transient response and
excellent loop stability. The ISL8022 operates at 2.25MHz
switching frequency allowing for the use of small, low cost
inductors and capacitors. Each channel is optimized for
generating an output voltage as low as 0.6V.
• 180° out-of-phase
• Start-up with pre-biased output
• Selectable forced PWM mode and PFM mode
• External synchronization up to 8MHz
• Negative current detection and protection
• 100% maximum duty cycle for lowest dropout
• Internal current mode compensation
The ISL8022 has a user configurable mode of operation-forced
PWM mode and PFM/PWM mode. The forced PWM mode
operation reduces noise and RF interference while the PFM
mode operation provides high efficiency by reducing switching
losses at light loads. In PFM mode of operation, both channels
draw a total quiescent current of only 40µA, hence enabling
high light load efficiency in order to maximize battery life.
• Peak current limiting, hiccup mode short circuit protection
and over-temperature protection
• Pb-free (RoHs compliant)
Applications
• DC/DC POL modules
The ISL8022 offers a 1ms Power-Good (PG) to monitor both
outputs at power-up. When shutdown, ISL8022 discharges the
outputs capacitor. Other features include internal digital
soft-start, enable for power sequence, overcurrent protection,
and thermal shutdown. The ISL8022 is offered in a
• µC/µP, FPGA and DSP power
• Plug-in DC/DC modules for routers and switchers
• Test and measurement systems
• Li-ion battery powered devices
• Bar code readers
4mmx3mm 12 Ld DFN package with 1mm maximum height.
2
The complete converter occupies less than 1.8cm area.
Related Literature
• AN1554 “ISL8022EVAL1Z Dual 2A/1.7A Low Quiescent
Current 2.25MHz High Efficiency Synchronous Buck
Regulator”
• AN1587 “ISL8022EVAL2Z Dual 2A/1.7A Low Quiescent
Current 2.25MHz High Efficiency Synchronous Buck
Regulator”
100
90
80
2.5V
OUT1PFM
2.5V
OUT1PWM
3.3V
OUT2PFM
70
60
50
40
3.3V
OUT2 PWM
2.25MHz 5V AT +25°C
IN
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
OUTPUT LOAD (A)
FIGURE 1. CHARACTERISTIC CURVE
FN7650 Rev 3.00
March 14, 2013
Page 1 of 18
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