ISL9104 Datasheet, PDF (1/13 Pages) Intersil Corporation – 500mA 4.3MHz Low IQ High Efficiency Synchronous Buck Converter

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Data Sheet
500mA 4.3MHz Low I_Q High Efficiency
Synchronous Buck Converter
The ISL9104, ISL9104A is a 500mA, 4.3MHz step-down
regulator, which is ideal for powering low-voltage
microprocessors in compact devices such as PDAs and
cellular phones. It is optimized for generating low output
voltages down to 0.8V. The supply voltage range is from
2.7V to 6V allowing the use of a single Li+ cell, three NiMH
cells or a regulated 5V input. It has guaranteed minimum
output current of 500mA. A high switching frequency of
4.3MHz pulse-width modulation (PWM) allows using small
external components. Under light load condition, the device
operates at low I_Q skip mode with typical 20µA quiescent
current for highest light load efficiency to maximize battery
life, and it automatically switches to fixed frequency PWM
mode under heavy load condition.
The ISL9104, ISL9104A includes a pair of low
ON-resistance P-Channel and N-Channel internal MOSFETs
to maximize system efficiency and minimize the external
component count. 100% duty-cycle operation allows less
than 300mV dropout voltage at 500mA.
The ISL9104, ISL9104A offers internal digital soft-start,
enable for power sequence, overcurrent protection and
thermal shutdown functions. In addition, the ISL9104,
ISL9104A offers a quick bleeding function that discharges
the output capacitor when the IC is disabled.
The ISL9104, ISL9104A is offered in a 1.6x1.6mm µTDFN
package. The complete converter occupies less than
0.5CM².
Pinout
ISL9104, ISL9104A
(6 LD 1.6x1.6 µTDFN)
TOP VIEW
VIN 1
6 SW
EN 2
5 GND
NC 3
4 FB
ISL9104, ISL9104A
July 9, 2009
FN6829.3
Features
• High Efficiency Integrated Synchronous Buck Regulator
with up to 93% Efficiency
• 2.7V to 6.0V Supply Voltage
• 4.3MHz PWM Switching Frequency
• 500mA Guaranteed Output Current
• 3% Output Accuracy Over-Temperature and Line for Fixed
Output Options
• 20µA Quiescent Supply Current in Skip Mode
• Less than 1µA Logic Controlled Shutdown Current
• 100% Maximum Duty Cycle for Lowest Dropout
• Ultrasonic Switching Frequency at Skip Mode to Prevent
Audible Frequency Noise (For ISL9104A Only)
• Discharge Output Capacitor when Disabled
• Internal Digital Soft-Start
• Peak Current Limiting, Short Circuit Protection
• Over-Temperature Protection
• Chip Enable
• Small 6 Pin 1.6mmx1.6mm µTDFN Package
• Pb-Free (RoHS Compliant)
Applications
• Single Li-ion Battery-Powered Equipment
• Mobile Phones and MP3 Players
• PDAs and Palmtops
• WCDMA Handsets
• Portable Instruments
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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