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ISL91127IRAZ-T

更新时间： 2024-09-20 00:59:59
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瑞萨 - RENESAS /
页数 文件大小 规格书
12页 984K
描述
High Efficiency Buck-Boost Regulator with 4.5A Switches

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DATASHEET  
ISL91127IR  
High Efficiency Buck-Boost Regulator with 4.5A Switches  
FN8859  
Rev 1.00  
August 3, 2016  
The ISL91127IR is a high-current buck-boost switching  
regulator for systems using new battery chemistries. It uses  
Intersil’s proprietary buck-boost algorithm to maintain voltage  
regulation while providing excellent efficiency and very low  
output voltage ripple when the input voltage is close to the  
output voltage.  
Features  
• Accepts input voltages above or below regulated output  
voltage  
• Automatic and seamless transitions between buck and  
boost modes  
The ISL91127IR is capable of delivering at least 2A continuous  
• Input voltage range: 1.8V to 5.5V  
output current (V  
= 3.3V) over a battery voltage range of  
OUT  
• Output current: up to 2A (PVIN = 2.5V, V  
• High efficiency: up to 96%  
= 3.3V)  
OUT  
2.5V to 4.35V. This maximizes the energy utilization of  
advanced single-cell Li-ion battery chemistries that have  
significant capacity left at voltages below the system voltage.  
Its fully synchronous low ON-resistance, 4-switch architecture  
and a low quiescent current of only 30µA optimize efficiency  
under all load conditions.  
• 30µA quiescent current maximizes light-load efficiency  
• 2.5MHz switching frequency minimizes external component  
size  
• Fully protected for short-circuit, over-temperature and  
undervoltage  
The ISL91127IR supports stand-alone applications with a fixed  
3.3V or 3.5V output voltage or adjustable output voltage with  
an external resistor divider. Output voltages as low as 1.0V or  
as high as 5.2V are supported.  
• 20 Ld 4mmx4mm QFN package  
Applications  
• Handheld and battery powered consumer and medical  
devices  
The ISL91127IR is available in a 20 Ld, 0.5mm pitch QFN  
(4mmx4mm) package. The 2.5MHz switching frequency  
further reduces the size of external components.  
• Brownout free system voltage for smartphones and tablet  
PCs  
Related Literature  
• UG080, “ISL91127IRN-EVZ, ISL91127IR2A-EVZ,  
ISL91127IRA-EVZ Evaluation Boards User Guide”  
• Wireless communication devices  
• 2G/3G/4G RF power amplifiers  
100  
95  
ISL91127IRNZ  
V
1.8V TO 5.5V  
IN =  
LX1  
PVIN  
L
1µH  
C
1
10µF  
1
90  
LX2  
V
OUT = 3.3V  
VIN  
EN  
85  
VOUT  
C
VIN = 2.5V  
2
2x22µF  
80  
FB  
VIN = 3.3V  
MODE  
VIN = 3.6V  
75  
SGND PGND  
VIN = 4V  
70  
1
10  
100  
1000  
LOAD CURRENT (mA)  
FIGURE 1. TYPICAL APPLICATION: V  
OUT  
= 3.3V  
FIGURE 2. EFFICIENCY: V = 3.3V, T = +25°C  
OUT A  
FN8859 Rev 1.00  
August 3, 2016  
Page 1 of 12  
1234567...12

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