ISL8009A

1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator

OVERVIEW

The ISL8009A is a high efficiency, monolithic, synchronous step-down DC/DC regulator that can deliver up to 1.5A continuous output current. It is optimized for generating low output voltages down to 0.8V. The supply voltage range of 2.7V to 5.5V allows for the use of single Li+cell, three NiMH cells or a regulated 5V input. The ISL8009A uses current mode control architecture to deliver very low duty cycle operation at high frequency with fast transient response and excellent loop stability. It has flexible operation mode selection of forced PWM mode and automatic PFM/PWM with as low as 17µA quiescent current, achieving high power conversion efficiency under light load condition, hence maximizing battery life. High 1.6MHz pulse-width modulation (PWM) switching frequency allows the use of small external components.

The ISL8009A integrates a pair of low ON-resistance P-Channel and N-Channel internal MOSFETs to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 400mV dropout voltage at 1.5A output current.

The ISL8009A offers a 2ms Power-On-Reset (POR) timer at power-up. The timer output can be reset by RSI. When shutdown, ISL8009A discharges the output capacitor through a 100Ω resistor. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown.

The ISL8009A is offered in a 2mmx3mm 8 Ld DFN package with 1mm maximum height. The complete converter occupies less than 1cm2 area.

KEY FEATURES

  • High Efficiency Synchronous Buck Regulator with up to 95% Efficiency
  • 2ms Reset Timer
  • 2.7V to 5.5V Supply Voltage
  • 3% Output Accuracy Over-Temperature/Load/Line
  • 1.5A Guaranteed Output Current
  • 17µA Quiescent Supply Current in PFM Mode
  • Selectable Forced PWM Mode and PFM Mode
  • Less Than 1µA Logic Controlled Shutdown Current
  • 90% Maximum Duty Cycle for Lowest Dropout at 1.5A
  • Internal Current Mode Compensation
  • Internal Digital Soft-Start
  • Peak Current Limiting, Short Circuit Protection
  • Over-Temperature Protection
  • Enable
  • Soft Discharge Disable
  • Small 8 Ld 2mmx3mm DFN
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8009A
Basic Information
生产状态
Mass Production
iSim模型
YES
拓扑
Buck
输出数量
1
输入电压最小值 (V)
2.7
输入电压最大值 (V)
5.5
输出电压最小值 (V)
0.8
输出电压最大值 (V)
5.5
输出电流最大值 (A)
1.5
IQ
17 µA
开关频率 (最大值) (MHz)
1.6
开关频率 (最小值) (MHz)
1.6
最大占空比 (%)
See Datasheet
资质级别
Standard
峰值效率 (%)
95
POR
Yes
BOM总占用面积 (mm2)
100
控制类型
Current Mode
开关频率范围 (MHz)
1.6
温度范围
-40 to +85

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