ISL9105

600mA Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator

OVERVIEW

ISL9105 is a 600mA, 1.6MHz step-down regulator that is ideal for powering low-voltage microprocessors in handheld devices such as PDAs and cellular phones. It is optimized for generating low output voltages down to 0.8V. The supply voltage range is from 2.7V to 5.5V, allowing for the use of a single Li+ cell, three NiMH cells or a regulated 5V input. It has a guaranteed minimum output current of 600mA. 1.6MHz pulse-width modulation (PWM) switching frequency allows for use of small external components. It has flexible operation mode selection of forced PWM mode and low IQ mode with typical 25µA quiescent current for highest light load efficiency to maximize battery life.

The ISL9105 includes a pair of low ON-resistance P-Channel and N-Channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty-cycle operation allows less than 200mV dropout voltage at 600mA output current.

The ISL9105 offers a typical 216ms Power-On-Reset (POR) timer at power-up. The timer output can be reset by RSI. When shutdown, ISL9105 discharges the output capacitor. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown.

The ISL9105 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
  • Selectable Forced PWM Mode and SKIP Mode
  • 25µA Quiescent Supply Current in SKIP Mode
  • 2.7V to 5.5V Supply Voltage
  • 216ms POR Timer
  • 3% Output Accuracy Over Temperature/Line/Load
  • 600mA Guaranteed Output Current
  • Less than 1µA Logic Controlled Shutdown Current
  • 100% Maximum Duty Cycle for Lowest Dropout
  • Discharge Output Capacitor when Shutdown
  • Internal Loop Compensation
  • Internal Digital Soft-Start
  • Peak Current Limit Protection, Short Circuit Protection
  • Over-Temperature Protection
  • Enable
  • Small 8 Ld 2mmx3mm DFN
  • Pb-free (RoHS Compliant)

PARAMETRICS

Parameters
ISL9105
Basic Information
Production Status
量産中
トポロジ
Buck
出力数
1
入力電圧 (V) (min)
2.7
入力電圧 (V) (max)
5.5
出力電圧 (V) (min)
0.8
出力電圧 (V) (max)
5.5
出力電流 (A) (max)
0.6
IQ
25 µA
スイッチング周波数 (max) (MHz)
1.6
スイッチング周波数 (min) (MHz)
1.6
最大デューティサイクル (%)
100
認定レベル
Standard
ピーク効率 (%)
96
POR
Yes
BOM総フットプリント (mm2)
109.7
SYNCH機能
No
制御タイプ
Current Mode
スイッチング周波数範囲 (MHz)
1.6
CANサンプル
YES
温度範囲
-40 to +85

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