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ISL78200

更新时间： 2024-11-25 12:20:31
品牌 Logo 应用领域
英特矽尔 - INTERSIL 转换器稳压器
页数 文件大小 规格书
19页 963K
描述
2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter

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ISL78200 数据手册

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2.5A Regulator with Integrated High-Side MOSFET for  
Synchronous Buck or Boost Buck Converter  
ISL78200  
Features  
The ISL78200 is a synchronous buck controller with a 90mΩ  
high side MOSFET and low side driver integrated. The ISL78200  
supports a wide input voltage range from 3V to 40V. Regarding  
the output current capability, the ISL78200 can typically support  
• Ultra Wide Input Voltage Range 3V to 40V  
• Selectable Mode Operation  
- Forced PWM Mode  
- PFM Mode  
- Programmable Current Boundary between PFM and PWM  
Modes  
a continuous load of 2.5A under conditions of 5V V , V  
OUT IN  
range of 8V to 36V, 500kHz, +85°C ambient temperature with  
still air. For any specific application, the actual maximum output  
current depends upon the die temperature not exceeding  
+125°C with the power dissipated in the IC, which is related to  
input voltage, output voltage, duty cycle, switching frequency,  
ambient temperature and board layout, etc. Refer to the Output  
Current section on page 14 for more details.  
• 300µA IC Quiescent Current (PFM, No Load); 180µA Input  
Quiescent Current (PFM, No Load, V  
Connected to AUXVCC)  
OUT  
• Less than 3µA Standby Input Current (IC Disabled)  
• Operational Topologies  
- Synchronous Buck  
The ISL78200 has flexible selection of operation modes of  
forced PWM mode and PFM mode. In PFM mode, the  
quiescent input current is as low as 300µA and can be further  
- Non-Synchronous Buck  
- Two Stage Boost Buck  
• Programmable Frequency from 200kHz - 2.2MHz and  
Frequency Synchronization Capability  
reduced to 180µA with AUXVCC connected to V  
under 12V  
application. The load boundary between PFM  
OUT  
V
and 5V V  
OUT  
IN  
• ±1% Tight Voltage Regulation Accuracy  
• Reliable Cycle by Cycle Overcurrent Protection  
- Temperature Compensated Current Sense  
- Frequency Foldback  
- Programmable OC Limit  
- Hiccup Mode Protection in Worst Case Short Condition  
and PWM can be programmed to cover wide applications.  
The low side driver can be either used to drive an external low  
side MOSFET for a synchronous buck, or left unused for a  
standard non-synchronous buck. The low side driver can also  
be used to drive a boost converter as a pre-regulator that  
greatly expands the operating input voltage range down to 3V  
or lower (refer to “Typical Application Schematic III - Boost  
Buck Converters” on page 5).  
• 20 Ld HTSSOP Package  
• Pb-Free (RoHS Compliant)  
The ISL78200 offers the most robust current protections. It  
uses peak current mode control with cycle-by-cycle current  
limiting. It is implemented with frequency foldback under  
current limit condition; in addition, the hiccup overcurrent  
mode is also implemented to guarantee reliable operations  
under harsh short conditions.  
Applications  
•
Automotive Applications  
• General Purpose Power Regulator  
• 24V Bus Power  
• Battery Power  
The ISL78200 has comprehensive protections against various faults  
including overvoltage and over-temperature protections, etc.  
• Embedded Processor and I/O Supplies  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
6V V  
IN  
PGOOD  
EN  
MODE  
SYNC  
V
IN  
VIN  
BOOT  
12V V  
IN  
AUXVCC  
40V V  
IN  
24V V  
IN  
VCC  
ILIMIT  
SS  
V
OUT  
ISL78200  
PHASE  
LGATE  
PGND  
EXT_BOOST  
FS  
SGND  
FB  
COMP  
0.1m  
1m  
10m  
100m  
1
2.5  
LOAD CURRENT (A)  
FIGURE 1. TYPICAL APPLICATION  
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,  
5V, T = +25°C  
V
OUT  
A
September 22, 2011  
FN7641.0  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. 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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