ISL6440

300kHz Dual, 180° Out-of-Phase, Step-Down PWM Controller

OVERVIEW

The ISL6440 is a high-performance, dual-output PWM controller optimized for converting wall adapter, battery or network intermediate bus DC input supplies into the system supply voltages required for a wide variety of applications. Each output is adjustable down to 0.8V. The two PWMs are synchronized 180o out of phase reducing the RMS input current and ripple voltage.

The ISL6440 incorporates several protection features. An adjustable overcurrent protection circuit monitors the output current by sensing the voltage drop across the lower MOSFET. Hiccup mode overcurrent operation protects the DC/DC components from damage during output overload/short circuit conditions. Each PWM has an independent logic-level shutdown input (SD1 and SD2 ).

A single PGOOD signal is issued when soft-start is complete on both PWM controllers and their outputs are within 10% of the set point. Thermal shutdown circuitry turns off the device if the junction temperature exceeds +150°C.

KEY FEATURES

  • Wide Input Supply Voltage Range
  • 5.6V to 24V
  • 4.5V to 5.6V
  • Two Independently Programmable Output Voltages
  • Switching Frequency 300kHz
  • Out of Phase PWM Controller Operation
  • Reduces Required Input Capacitance and Power Supply Induced Loads
  • No External Current Sense Resistor
  • Uses Lower MOSFET's rDS(ON)
  • Programmable Soft-Start
  • Extensive Circuit Protection Functions
  • PGOOD
  • UVLO
  • Overcurrent
  • Overtemperature
  • Independent Shutdown for Both PWMs
  • Excellent Dynamic Response
  • Voltage Feed-Forward with Current Mode Control
  • Pb-Free Plus Anneal Available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6440
Basic Information
Production Status
Mass Production(*)
iSim Model
YES
# of Outputs
2
Input Voltage Min (V)
4.5
Input Voltage Max (V)
24
Output Voltage Min (V)
0.8
Output Voltage 1 Max (V)
24
Output Current 1 Max (A)
10
Switching Frequency (kHz)
300
Bias Voltage (VCC) (V)
5
Linear Output
No
DDR Capable
No
Qualification Level
Standard
Bias Voltage Range (V)
5
Can Sample
YES
Temperature Range
-40 to +85

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