ISL8022

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

OVERVIEW

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.

KEY 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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8022
Basic Information
生产状态
Mass Production
拓扑
Buck
输出数量
2
输入电压最小值 (V)
2.8
输入电压最大值 (V)
5.5
输出电压最小值 (V)
0.6
输出电压最大值 (V)
5.5
输出电流最大值 (A)
2
IQ
40 µA
开关频率 (最大值) (MHz)
2.25
开关频率 (最小值) (MHz)
2.25
最大占空比 (%)
See Datasheet
资质级别
Standard
峰值效率 (%)
97
POR
Yes
BOM总占用面积 (mm2)
180
SYNCH功能
Yes
控制类型
Current Mode
开关频率范围 (MHz)
2.25
CAN 采样
YES
温度范围
-40 to +85

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