ISL8022 Datasheet, PDF (1/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous

Dual 2A/1.7A Low Quiescent Current 2.25MHz
High Efficiency Synchronous Buck Regulator
ISL8022
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 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 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*(see page 17)
• 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*(see page 17)
• AN1554 “ISL8022EVAL1Z Dual 2A/1.7A Low
Quiescent Current 2.25MHz High Efficiency
Synchronous Buck Regulator”
Characteristics Curve
100
90
80
2.5V_OUT1PFM
2.5V_OUT1PWM
70
3.3V_OUT2PFM
60
50 _{3.3VOUT2 PWM}
2.25MHz 5V_IN AT +25°C
40
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)
August 25, 2010
FN7650.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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