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ISL78268ARZ

更新时间： 2024-11-24 01:12:15
品牌 Logo 应用领域
英特矽尔 - INTERSIL /
页数 文件大小 规格书
33页 1517K
描述
Integrated 2A sourcing

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ISL78268ARZ 数据手册

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DATASHEET  
55V Synchronous Buck Controller with Integrated 3A  
Driver  
ISL78268  
Features  
The ISL78268 is a grade 1, automotive, synchronous buck  
controller with integrated high/low side MOSFET drivers. It  
supports a wide operating input voltage range of 5V to 55V  
• Wide input range 5V to 55V (switching); withstand 60V  
(non-switching)  
• Integrated 2A sourcing, 3A sinking MOSFET drivers  
and up to 60V at V when not switching. The integrated driver  
IN  
• Constant current regulation/limiting - dedicated average  
current control loop  
offers adaptive dead-time control and is capable of supplying  
up to 2A sourcing and 3A sinking current, allowing the  
ISL78268 to support power stages designed for a wide range  
of loads, from under 1A to over 25A.  
• Adjustable switching frequency or external synchronization  
from 50kHz up to 1.1MHz  
• Low shutdown current, I <1µA  
Q
• Peak current mode control with adjustable slope  
compensation  
ISL78268’s fully synchronous architecture enables power  
conversion with very high efficiency and improved thermal  
performance over standard buck converters. The ISL78268 also  
offers diode emulation mode for improved light load efficiency.  
• Selectable diode emulation mode for high efficiency at light  
load  
While ISL78268 is a peak current mode PWM controller, it  
also includes a dedicated average output current modulation  
loop, which achieves constant output current limiting for  
applications such as battery charging, super-cap charging, and  
temperature control systems where a constant current must  
be provided.  
• Input and output OVP, cycle-by-cycle current limiting,  
average current OCP, OTP  
• Selectable hiccup or latch-off fault responses  
• Pb-free 24 Ld 4x4 QFN package (RoHS compliant)  
• AEC-Q100 qualified  
The ISL78268 supports switching frequencies from 50kHz to  
1.1MHz allowing the user the flexibility to trade-off switching  
frequency and efficiency against the size of external  
components.  
Applications  
• Automotive power  
• Telecom and industrial power supplies  
• General purpose power  
• Supercap charging  
The ISL78268 offers comprehensive protection features. It  
includes robust current protection with cycle-by-cycle peak  
current limiting, average current limiting, and a selectable  
hiccup or latch-off fault responses. In addition, it offers  
protection against over-temperature, as well as input and  
output overvoltages.  
Related Literature  
• AN1946, “ISL78268EVAL1Z Evaluation Board User Guide”  
VIN  
VIN  
EN  
EN_IC  
PVCC  
ISEN1P  
ISEN1N  
PVCC  
100  
95  
VCC  
PVCC  
90  
IMON/DE  
85  
80  
75  
70  
65  
60  
55  
50  
BOOT  
UG  
V
= 15V  
IN  
V
= 24V  
IN  
FSYNC  
V
= 36V  
IN  
VOUT  
ISL78268  
PLL_COMP  
PH  
LG  
V
= 55V  
IN  
SLOPE  
ISEN2P  
ISEN2N  
COMP  
SS  
FB  
VCC  
V
= 12V, T = +25°C  
A
OUT  
CLKOUT  
PGOOD  
POWER GOOD  
HIC/LATCH  
0
1
2
3
4
5
SGND PGND  
I
(A)  
OUT  
FIGURE 1. SIMPLIFIED TYPICAL APPLICATION SCHEMATIC  
FIGURE 2. EFFICIENCY CURVES (ISL78268EVAL1Z/DE MODE)  
December 12, 2014  
FN8657.3  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved  
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.  
All other trademarks mentioned are the property of their respective owners.  
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