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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 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
? 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
70
60
50
12V OUT 1MHz
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
February 23, 2012
FN6676.6
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2010, 2011, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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