ISL85033 Datasheet, PDF (1/25 Pages) Intersil Corporation – Wide VIN Dual Standard Buck Regulator With 3A/3A Coutinuous Output Current

Wide V_IN Dual Standard Buck Regulator With
3A/3A Continuous Output Current
ISL85033
The ISL85033 is a dual standard buck regulator
capable of 3A per channel continuous output current.
With an input range of 4.5V to 28V, it provides a high
frequency power solution for a variety of point of load
applications.
The PWM controller in the ISL85033 drives an internal
switching N-Channel power MOSFET and requires an
external Schottky diode to generate the output
voltage. The integrated power switch is optimized for
excellent thermal performance up to 3A of output
current. The PWM regulator switches at a default
frequency of 500kHz and it can be user programmed
or synchronized from 300kHz to 2MHz. The ISL85033
utilizes peak current mode control to provide flexibility
in component selection and minimize solution size. The
protection features include overcurrent, UVLO and
thermal overload protection.
The ISL85033 is available in a small 4mmx4mm Thin
Quad Flat Pb-free (TQFN) package.
Related Literature*(see page 24)
• See AN1574 ”ISL85033DUALEVAL1Z Wide VIN
Dual Standard Buck Regulator With 3A/3A Output
Current”
Features
• Wide Input Voltage Range from 4.5V to 28V
• Adjustable Output Voltage with Continuous Output
Current up to 3A
• Current Mode Control
• Adjustable Switching Frequency from 300kHz to 2MHz
• Independent Power-Good Detection
• Selectable In-Phase or Out-of-Phase PWM
Operation
• Independent, Sequential, Ratiometric or Absolute
Tracking Between Outputs
• Internal 2ms Soft-start Time
• Overcurrent/Short Circuit Protection, Thermal
Overload Protection, UVLO
• Boot Undervoltage Detection
• Pb-Free (RoHS Compliant)
Applications*(see page 24)
• General Purpose Point of Load DC/DC Power
Conversion
• Set-top Boxes
• FPGA Power and STB Power
• DVD and HDD Drives
• LCD Panels, TV Power
• Cable Modems
100
90
80
12V_OUT 1MHz
70
60
50
40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 1. EFFICIENCY vs LOAD, V_IN = 28V, T_A = +25°C
June 24, 2010
FN6676.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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