ISL9305

3MHz Dual Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface

Product Status: Mass Production

OVERVIEW

The ISL9305 is an integrated mini Power Management IC (mini-PMIC) ideal for applications of powering low-voltage microprocessor or multiple voltage rails with battery as input sources, such as a single Li-ion or Li-Polymer. ISL9305 integrates two high-efficiency 3MHz synchronous step-down converters (DCD1 and DCD2) and two low-input, low-dropout linear regulators (LDO1 and LDO2).

The 3MHz PWM switching frequency allows the use of very small external inductors and capacitors. Both step-down converters can enter skip mode under light load conditions to further improve the efficiency and maximize the battery life. For noise sensitive applications, they can also be programmed through I2 C interface to operate in forced PWM mode regardless of the load current condition. The I2 C interface supports on-the-fly slew rate control of the output voltage from 0.825V to 3.6V at 25mV/step size for dynamic power saving. Each step-down converter can supply up to 800mA load current. The default output voltage can be set from 0.8V to VIN using external feedback resistors on the adjustable version, or the ISL9305 can be ordered in factory pre-set voltage options from 0.9V to 3.6V in 50mV step.

The ISL9305 also provides two 300mA low dropout (LDO) regulators. The input voltage range is 1.5V to 5.5V allowing them to be powered from one of the on-chip step-down converters or directly from the battery. The default LDO power-up output comes with factory pre-set fixed output voltage options between 0.9V to 3.3V.

The ISL9305 is available in a 4mmx4mm 16 Ld TQFN package.

KEY FEATURES

    • Dual 800mA, Synchronous Step-down Converters and Dual 300mA, General-purpose LDOs
    • Input Voltage Range
      - DCD1/DCD2: 2.3V to 5.5V
      - LDO1/LDO2: 1.5V to 5.5V
    • 400kb/s I2C-bus Series Interface Transfers the Control Data Between the Host Controller and the ISL9305
    • Adjustable Output Voltage
      - VODCD1/VODCD2: 0.8V to VIN
    • Fixed Output I2C Programmability
      - At 25mV/Step: 0.825V to 3.6V
    • LDO1/LDO2 Output Voltage I2C Programmability
      - At 50mV/Step: 0.9V to 3.6V
    • 50μA IQ (Typ) with DCD1/DCD2 in Skip Mode; 20μA IQ (Typ) for each Enabled LDO
    • On-the-fly I2C Programming of DC/DC and LDO Output Voltages
    • DCD1/DCD2 I2C Programmable Skip Mode Under Light Load or Forced Fixed Switching Frequency PWM Mode
    • Small, Thin, 4mmx4mm TQFN Package

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL9305
Basic Information
Production Status
Mass Production
# of Outputs
4
Topology [Rail 1]
Buck
Input Voltage Min (V) [Rail 1]
2.3
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]
0.8
IQ [Rail 1]
50 µA
Switching Freq. (max) (MHz)
3.4
Switching Freq. (min) (MHz)
2.6
Max Duty Cycle (%)
See Datasheet
Qualification Level
Standard
Peak Efficiency (%)
92
POR
Yes
SYNCH Capability
No
Control Type
Current Mode
Switching Frequency Range (MHz)
3000
Can Sample
YES
Temperature Range
-40 to +85

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Cross Reference

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