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ISL8022 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 ISL8022
部品説明 Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator
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ISL8022 Datasheet, ISL8022 PDF,ピン配置, 機能
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 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”
March 14, 2013
FN7650.3
100
90
80 2.5VOUT1PFM
2.5VOUT1PWM
70
3.3VOUT2PFM
60
50 3.3VOUT2 PWM
2.25MHz 5VIN AT +25°C
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
OUTPUT LOAD (A)
2.0
FIGURE 1. CHARACTERISTIC CURVE
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2010, 2011, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

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