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ISL85005FRZ

更新时间： 2024-11-16 02:57:35
品牌 Logo 应用领域
瑞萨 - RENESAS /
页数 文件大小 规格书
23页 1254K
描述
4.5V to 18V Input, 5A High Efficiency Synchronous Buck Regulator

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ISL85005FRZ 数据手册

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DATASHEET  
ISL85005, ISL85005A  
4.5V to 18V Input, 5A High Efficiency Synchronous Buck Regulator  
FN8871  
Rev.2.00  
May 17, 2018  
The ISL85005 and ISL85005A are monolithic, synchronous  
Features  
buck regulators with integrated 5A, 18V high-side and low-side  
FETs. These devices provide an integrated bootstrap diode for  
the high-side gate driver to reduce the external parts count.  
These devices also have a wide input voltage range to support  
applications with input voltage from multi-cell batteries or  
regulated 5V and 12V power rails.  
• 4.5V to 18V input voltage range  
• Internal 5A, 18V high-side and low-side MOSFET switches  
• ±1%, 0.8V feedback voltage reference  
• Integrated bootstrap diode with undervoltage detection  
• Current mode control with internal slope compensation  
• Internal or external compensation options  
The ISL85005 and ISL85005A regulate the output voltage  
with current mode control and have an internal oscillator. The  
switching frequency of the ISL85005 is internally set as  
500kHz, and can be synchronized to an external clock signal  
with frequency ranges from 300kHz to 2MHz. The ISL85005A  
has a fixed 500kHz switching frequency.  
• Default internally set 500kHz switching frequency  
• Synchronization capability to external clock (ISL85005)  
• Diode Emulation Mode (DEM) and Forced CCM (FCCM)  
options (ISL85005)  
The ISL85005 has a fixed 2.3ms soft-start, while the  
ISL85005A features programmable soft-start to limit inrush  
current during startup. With the SS pin floating, the soft-start  
time of ISL85005A is also 2.3ms.  
• Adjustable soft-start time (ISL85005A)  
• Output Power-Good (PG) indicator  
• Input Undervoltage Lockout (UVLO), input and output  
overvoltage protection  
The ISL85005 can be configured in either forced Continuous  
Conduction Mode (CCM) or Diode Emulation Mode (DEM). DEM  
enables high efficiency at light-load conditions. The  
ISL85005A always operates in forced CCM.  
• High-side cycle-by-cycle current limit, low-side forward and  
reverse overcurrent protection, and thermal shutdown  
• Small 12-pin 3mmx4mm Dual Flat No-Lead (DFN) package  
with EPAD for enhanced thermal performance  
The ISL85005 and ISL85005A have built-in protections  
including input UVLO protection, input and output overvoltage  
protection, high-side cycle-by-cycle current limit, low-side  
forward current limit and reverse current limit, and thermal  
shutdown.  
Applications  
• Network and communications equipment  
• Battery powered systems  
• Multifunction printers  
Related Literature  
For a full list of related documents, visit our website  
• Point-of-load regulators  
• Standard 12V rail supplies  
• Embedded computing systems  
• ISL85005, ISL85005A product pages  
Typical Application  
95  
90  
85  
80  
75  
70  
ISL85005  
GND = DEM; VCC = FCCM  
SYNC/  
MODE  
MODE  
BOOT  
VDD  
1
2
3
4
5
6
12  
11  
C
4
V
IN  
PG  
EN  
PG  
4.5V TO 18V  
EN  
VIN 10  
PGND  
VIN  
9
C
FB  
C
6
3
C
5
V
R
1
OUT  
2
PHASE  
PHASE  
COMP  
AGND  
8
7
12V TO 5V  
R
1
5A MAX  
65  
C
12V TO 3.3V  
L
1
60  
C
C
12V TO 1.8V  
8
9
55  
50  
0
1
2
3
4
5
OUTPUT CURRENT (A)  
FIGURE 1. ISL85005 WITH INTERNAL COMPENSATION  
FIGURE 2. EFFICIENCY vs OUTPUT CURRENT  
FN8871 Rev.2.00  
May 17, 2018  
Page 1 of 23  
1234567...23

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