ISL6402

Features:

Wide Input Supply Voltage Range . . . . . . . . . 4.5V to 24V
Three 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)
Bidirectional Frequency Synchronization for Synchronizing Multiple ISL6402s
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
QFN Packages:
  - QFN - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
  - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
Pb-Free Available (RoHS Compliant)


Application

Power Supplies with Multiple Outputs
xDSL Modems/Routers
DSP, ASIC, and FPGA Power Supplies
Set-Top Boxes
Dual Output Supplies for DSP, Memory, Logic, µP Core and I/O
Telecom Systems


Pinout




Specifications

Supply Voltage (VCC_5V Pin) . . . . . . . . . . . . . . . . . . -0.3V to +7V
Input Voltage (VIN Pin) . . . . . . . . . . . . . . . . . .. . . . . . . . . . .+30V
BOOT1, 2 and UGATE1, 2. . . . . . . . . . . . . . . . . . . . . . . . . . . +35V
PHASE1, 2 and ISEN1, 2 . . . . . . . . . . . . . . . . .  . . . . . . . . . . +30V
BOOT1, 2 with respect to PHASE1, 2 . . . . . . . . . . . . . . . . . +6.5V
UGATE1, 2. . . . . . . . . . . . (PHASE1, 2 - 0.3V) to (BOOT1, 2 +0.3V)


Description

The ISL6402 is a high-performance, triple-output 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 ISL6402 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 and the linear regulator output is greater than 75% of its setpoint. Thermal shutdown circuitry turns off the device if the junction temperature exceeds +150°C.