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ISL9104AIRUCEVAL1Z

更新时间： 2024-11-09 00:48:03
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500mA 4.3MHz Low IQ High Efficiency Synchronous Buck Converter

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DATASHEET  
ISL9104, ISL9104A  
FN6829  
Rev 5.00  
500mA 4.3MHz Low I High Efficiency Synchronous Buck Converter  
Q
The ISL9104, ISL9104A is a 500mA, 4.3MHz step-down  
Features  
regulator, which is ideal for powering low-voltage  
• High Efficiency Integrated Synchronous Buck Regulator with  
up to 93% Efficiency  
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.  
• 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  
Under light load condition, the device operates at low I skip  
Q
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.  
• 20µA Quiescent Supply Current in Skip Mode  
• Less than 1µA Logic Controlled Shutdown Current  
• 100% Maximum Duty Cycle for Lowest Dropout  
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.  
• 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  
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.  
• Chip Enable  
• Small 6 Pin 1.6mmx1.6mm µTDFN Package  
• Pb-Free (RoHS Compliant)  
The ISL9104, ISL9104A is offered in a 1.6x1.6mm µTDFN  
package. The complete converter occupies less than 0.5CM .  
2
Related Literature  
• See AN1522, “ISL9104xxxxEVAL1Z, ISL9104AxxxxEVAL1Z  
Evaluation Board Application Manual”  
Applications  
• Single Li-ion Battery-Powered Equipment  
• Mobile Phones and MP3 Players  
• PDAs and Palmtops  
• WCDMA Handsets  
• Portable Instruments  
100  
95  
90  
85  
80  
75  
70  
65  
Pin Configuration  
ISL9104, ISL9104A  
(6 LD 1.6x1.6 µTDFN)  
TOP VIEW  
VIN  
EN  
NC  
1
2
3
6
5
4
SW  
GND  
FB  
V
= 2.7V  
= 1.8V  
L = 1µH  
60  
55  
50  
IN  
OUT  
V
1
10  
100  
1000  
I
(mA)  
OUT  
FIGURE 1. EFFICIENCY vs OUTPUT CURRENT  
FN6829 Rev 5.00  
Page 1 of 14  
1234567...14

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