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ISL73847SEH

更新时间： 2024-11-22 14:58:15
品牌 Logo 应用领域
瑞萨 - RENESAS /
页数 文件大小 规格书
43页 3403K
描述
Radiation Hardened Single/Dual Phase Current Mode PWM Controller

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ISL73847SEH 数据手册

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Datasheet  
ISL73847SEH  
Radiation Hardened Single/Dual Phase Current Mode PWM Controller  
The ISL73847SEH is a synchronous buck controller  
that can operate as a single or dual phase controller.  
It is intended to work with the ISL73041SEH (half  
bridge GaN FET driver) to generate Point-Of-Load  
voltage rails for commercial space applications.  
Features  
▪ Wide operating voltage range:  
• Input: 4.5V to 19V  
• Output: 0.6V to  
VPWR_STAGE×((TSW-120ns)/TSW  
)
It accepts an input voltage range of 4.5V to 19V with a  
programmable output switching frequency between  
250kHz and 1.5MHz with a single resistor. The output  
can regulate a voltage upwards of 600mV and is  
limited on the top end by the minimum off time and  
selected switching frequency.  
▪ Programmable Output Switching Frequency  
• 250kHz to 1.5MHz  
▪ Optional Droop regulation  
▪ Current mode control provides  
• Excellent power supply rejection  
• Simplified control scheme  
The wide input voltage range makes it a suitable  
power supply option for a high current FPGA core and  
other general purpose power solutions. The  
ISL73847SEH uses current mode modulation which  
simplifies loop compensation and provides excellent  
power supply rejection. Additionally, the output is  
remotely sensed to compensate for any voltage drop  
in the load conditions. All of this put together results in  
a robust power supply solution that requires minimal  
components while achieving high current density.  
▪ Output differential remote sensing  
▪ Programmable soft-start  
▪ Enable control  
▪ Power-good Indicator  
▪ Radiation acceptance testing  
• LDR (0.01rad(Si)/s): 75krad(Si)  
▪ SEE hardness (see SEE report for details)  
• No SEB/SEL LETTH, VDD = 25V:  
86MeV•cm2/mg  
• SET/SEFI free at LET 86MeV•cm2/mg  
The ISL73847SEH also features a tri-level output that  
provides excellent protection against faults by driving  
a mid scale voltage to signal the power stage to enter  
a Hi-Z condition.  
▪ Qualified to Renesas Rad Hard Hermetic  
Screening and QCI Flow (R34TB0001EU)  
The ISL73847SEH operates across the military  
temperature range from -55°C to +125°C and are  
available in a 24 Ld hermetically sealed Ceramic Dual  
Flatpack (CDFP) package or in die form.  
• All screening and QCI is in accordance with  
MIL-PRF-38535L Class-V  
Applications  
▪ FPGA Core Power Supply  
▪ General Purpose Power Supply  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
VBUS  
H.B.  
Driver  
-
+
ISEN1  
ISL73847SEH  
VFB ISEN2  
FPGA  
Core  
VBUS  
12V to 1V (500kHz)  
5V to 1V (500kHz)  
12V to 1V (250kHz)  
5V to 1V (250kHz)  
-
+
+
-
H.B.  
Driver  
0
10  
20  
30  
40  
50  
ILOAD (A)  
Figure 2. 12V to 1V and 5V to 1V Conversion Efficiency  
Figure 1. FPGA Core Power Supply Application  
R34DS0022EU0200 Rev.2.00  
Apr 20, 2023  
Page 1  
© 2022-2023 Renesas Electronics  
1234567...43

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