ISL9105

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

Product Status: Mass Production

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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL9105
Basic Information
Production Status
Mass Production
# of Outputs
1
Topology [Rail 1]
Buck
Input Voltage Min (V) [Rail 1]
2.7
Input Voltage Max (V) [Rail 1]
5.5
Output Voltage Min (V) [Rail 1]
0.8
Output Voltage Max (V) [Rail 1]
5.5
Output Current Max (A) [Rail 1]
0.6
IQ [Rail 1]
25 µA
Switching Freq. (max) (MHz)
1.6
Switching Freq. (min) (MHz)
1.6
Max Duty Cycle (%)
100
Qualification Level
Standard
Peak Efficiency (%)
96
POR
Yes
BOM Total Footprint (mm2)
109.7
SYNCH Capability
No
Control Type
Current Mode
Switching Frequency Range (MHz)
1.6
Can Sample
YES
Temperature Range
-40 to +85

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This webinar introduces three buck-boost regulators in QFN packages, ISL91127IR, ISL91107IR, ISL9120IR, for battery-powered portable devices.
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This webinar introduces the ISL85003 and ISL85003A synchronous buck (step-down) regulators with integrated high-side and low-side FETs.
11:01
This webinar introduces the ISL78233, ISL78234 and ISL78235 automotive grade synchronous buck regulators for point-of-load applications.
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Find out how the highly efficient, compact 12V synchronous buck regulator family can meet your power requirements for 12V rails.
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This webinar introduces three buck-boost regulators in QFN packages, ISL91127IR, ISL91107IR, ISL9120IR, for battery-powered portable devices.
3:57
This webinar introduces the ISL85003 and ISL85003A synchronous buck (step-down) regulators with integrated high-side and low-side FETs.
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