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ISL8022

Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Renesas Electronics 

DATASHEET

ISL8022

Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck

Regulator

FN7650

Rev 3.00

March 14, 2013

The ISL8022 is a high efficiency, dual synchronous step-down

DC/DC regulator that can deliver up to 2A/1.7A continuous

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.

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.

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

4mmx3mm 12 Ld DFN package with 1mm maximum height.

The complete converter occupies less than 1.8cm2 area.

Features

• Dual 2A/1.7A high efficiency synchronous buck regulator

with up to 97% efficiency, low iq (40µA)

• 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

• Peak current limiting, hiccup mode short circuit protection

and over-temperature protection

• Pb-free (RoHs compliant)

Applications

• DC/DC POL modules

• 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

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

2.5VOUT1PFM

2.5VOUT1PWM

70

3.3VOUT2PFM

60

50 3.3VOUT2 PWM

2.25MHz 5VIN AT +25°C

400.0 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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