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ISL78264 PDF预览

ISL78264

更新时间： 2024-11-24 14:57:55
品牌 Logo 应用领域
瑞萨 - RENESAS /
页数 文件大小 规格书
33页 2042K
描述
Automotive Dual Synchronous Buck Controller with Integrated Drivers

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ISL78264 数据手册

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Datasheet  
ISL78264  
Automotive Dual Synchronous Buck Controller with Integrated Drivers  
The ISL78264 is a dual buck controller that can  
Features  
operate across a wide V range of 3.75V to 42V. It is  
IN  
• V operating range: 3.75V to 42V  
IN  
designed to support wide duty-cycle operation for  
switching frequencies from 200kHz up to 2.2MHz. To  
mitigate EMI, it supports synchronization to an  
external clock or programmable spread spectrum  
clocking. Its current-mode modulator is ideally suited  
to tolerate severe line transients. Also, the ISL78264  
supports dropout operation and low 25ns on-time to  
operate through automotive cranking and load dump  
pulses.  
• Low quiescent current: 6µA typical, one channel  
• Switching frequency: 200kHz to 2.2MHz  
• Dropout mode for high duty-cycle operation  
• 25ns on-times for low duty-cycle operation  
• External synchronization  
• Programmable spread spectrum clocking  
• 180° phase shift between channels  
The ISL78264 integrates robust MOSFET drivers and  
readily supports step-down applications requiring high  
output currents in normal operation. For applications  
that must also sustain extremely low power,  
• 2A Sourcing/3A sinking MOSFET drivers  
• Boot UVLO and programmable boot refresh time  
• Extensive protection mechanisms for  
OV/UV/OC/OT  
always-on operation, its energy conservation mode  
can reduce operating current to 6µA. Integrated  
feedback for VOUT1 is provided for 3.3V or 5V  
applications to eliminate the current otherwise flowing  
in external feedback resistors. An automatic  
Table 1. Output Configurations  
VOUT1 Selection  
VOUT2 Selection  
switchover to an external supply is also supported to  
maximize efficiency. A blocking diode is activated  
after startup to prevent the external supply from  
back-biasing a low input voltage at VIN.  
3.3V  
5.0V  
Adjustable 0.8V to 32V  
Adjustable 0.8V to 5V  
The ISL78264 is qualified to AEC-Q100 Grade 1,  
specified to operate across an ambient temperature  
range of -40°C to 125°C, and is available in a  
Applications  
• Automotive 12V Systems  
5mmx5mm, 32 Ld WFQFN (Wettable Flank) package.  
• Infotainment/Multimedia Systems  
• Cockpit safety systems  
• Advanced Driver Assist Systems (ADAS)  
VCC  
VBAT  
ISL78264  
VIN  
100  
90  
VBAT  
BOOT2  
HS2  
EXTSUP  
VCC  
VOUT2  
LX2  
LS2  
80  
70  
ISEN2P  
60  
VSEL  
CNT  
CNT2  
ISEN2N  
FB2  
Eff-8Vin-ECM  
50  
40  
30  
20  
10  
0
VBAT  
EN1  
Eff-12Vin-ECM  
Eff-16Vin-ECM  
Eff-8Vin-CCM  
Eff-12Vin-CCM  
Eff-16Vin-CCM  
BOOT1  
HS1  
PGOOD1  
VOUT1  
COMP1  
EN2  
LX1  
LS1  
PGOOD2  
ISEN1P  
COMP2  
SYNC  
RT  
ISEN1N  
FB1  
SGND  
PGND  
0.01  
0.1  
1
10  
I
(A)  
OUT  
Figure 2. Buck 1 Efficiency VOUT1 = 5V at 400 kHz  
Figure 1. Typical Application Schematic  
R33DS0002EU0200 Rev.2.00  
Oct 14, 2021  
Page 1 of 31  
© 2020 Renesas Electronics  
1234567...33

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