ISL8033 Datasheet, PDF (1/17 Pages) Intersil Corporation – Dual 3A Low Quiescent Current High Efficiency Synchronous Buck Regulator

Dual 3A Low Quiescent Current High Efficiency
Synchronous Buck Regulator
ISL8033, ISL8033A
ISL8033 is a dual integrated power controller rated for
3A per channel with a 1MHz step-down regulator that is
ideal for any low power low-voltage applications. The
ISL8033A offers 2.5MHz operation for smaller more
compacted design. The channels are 180° out-of-phase
for input RMS current and EMI reduction. It is optimized
for generating low output voltages down to 0.8V each.
The supply voltage range is from 2.85V to 6V, allowing
for the use of a single Li+ cell, three NiMH cells or a
regulated 5V input. It has a guaranteed minimum output
current of 3A each when ISET is connected to VDD. The
output current of each output is selectable by setting
ISET pin.
The ISL8033, ISL8033A includes a pair of low
ON-resistance P-Channel and N-Channel internal
MOSFETs to maximize efficiency and minimize external
component count. 100% duty-cycle operation allows less
than 250mV dropout voltage at 3A.
The ISL8033, ISL8033A offers an independent 1ms
Power-Good (PG) timer at power-up. When shutdown,
ISL8033, ISL8033A discharges the output capacitor.
Other features include internal digital soft-start, enable
for power sequence, controllable soft-stop output
discharge during disabled, start-up with pre-biased
output, 100% maximum duty cycle for lowest dropout,
100% duty cycle operation for smooth transition, less
than 8µA logic controlled shutdown current,
independent enable, overcurrent protection, and
thermal shutdown.
The ISL8033, ISL8033A is offered in a 24 Ld 4mmx4mm
QFN package with 1mm maximum height. The complete
converter occupies less than 5.46cm² area.
Features
• Dual 3A High Efficiency Synchronous Buck Regulator
with up to 95% Efficiency
• 2% Output Accuracy Over-Temperature/Load/Line
• Internal Digital Soft-Start - 1.5ms
• External Synchronization up to 6MHz (ISL8033)
• Internal Current Mode Compensation
• Peak Current Limiting and Hiccup Mode Short Circuit
Protection
• Adjustable Peak Overload Current
• Negative Current Protection
• Pb-Free (RoHS Compliant)
Applications*(see page 16)
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
• Test and Measurement Systems
• Li-ion Battery Power Devices
• Bar Code Readers
Efficiency vs Load
100
90
80
70
3.3V_OUT
60
50
V_IN = 5V
400.0
0.5
1.0
1.5
2.0
2.5
3.0
I_OUT (A)
October 21, 2010
FN6854.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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