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MAX5098A PDF预览

MAX5098A

更新时间: 2024-11-03 11:48:55
品牌 Logo 应用领域
美信 - MAXIM 转换器
页数 文件大小 规格书
28页 488K
描述
Dual, 2.2MHz, Automotive Buck or Boost Converter with 80V Load-Dump Protection

MAX5098A 数据手册

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19-4111; Rev 0; 5/08  
Dual, 2.2MHz, Automotive Buck or Boost  
Converter with 80V Load-Dump Protection  
MX5098A  
General Description  
Features  
The MAX5098A is a dual-output, high-switching-frequen-  
cy DC-DC converter with integrated n-channel switches  
that can be used either in high-side or low-side configura-  
tion. Each output can be configured either as a buck con-  
verter or a boost converter. In the buck configuration, this  
device delivers up to 2A from converter 1 and 1A from  
converter 2. The MAX5098A also integrates a load-dump  
protection circuitry that is capable of handling load-dump  
transients up to 80V for automotive applications. The  
load-dump protection circuit utilizes an internal charge-  
pump to drive the gate of an external n-channel MOSFET.  
When an overvoltage or load-dump condition occurs, the  
series protection MOSFET absorbs the high voltage tran-  
sient to prevent damage to lower voltage components.  
o Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage  
Range (with Up to 80V Load-Dump Protection)  
o Dual-Output DC-DC Converter with Integrated  
Power MOSFETs  
o Each Output Configurable in Buck or Boost Mode  
o Adjustable Outputs from 0.8V to 0.85V Buck  
IN  
Configuration) and from V to 28V (Boost  
IN  
Configuration)  
o I  
and I  
of 2A and 1A (Respectively) in  
OUT2  
OUT1  
Buck Configuration  
o Switching Frequency Programmable from 200kHz  
The DC-DC converters operate over a wide operating  
voltage range from 4.5V to 19V. The MAX5098A oper-  
ates 180° out-of-phase with an adjustable switching fre-  
quency to minimize external components while allowing  
the ability to make trade-offs between the size, efficiency,  
and cost. The high switching frequency (up to 2.2MHz)  
also allows this device to operate outside the AM band  
for automotive applications.  
to 2.2MHz  
o Synchronization Input (SYNC)  
o Clock Output (CKO) for Four-Phase Master-Slave  
Operation  
o Individual Converter Enable Input and Power-  
Good Output  
This device utilizes voltage-mode control for stable oper-  
ation and external compensation, thus the loop gain is  
tailored to optimize component selection and transient  
response. This device can be synchronized to an exter-  
nal clock fed at the SYNC input. Also, a clock output  
(CKO) allows a master-slave connection of two devices  
with a four-phase synchronized switching sequence.  
Additional features include internal digital soft-start, indi-  
vidual enable for each DC-DC regulator (EN1 and EN2),  
open-drain power-good outputs (PGOOD1 and  
PGOOD2), and a shutdown input (ON/OFF).  
o Low-I (7µA) Standby Current (ON/OFF)  
Q
o Internal Digital Soft-Start and Soft-Stop  
o Short-Circuit Protection on Outputs and  
Maximum Duty-Cycle Limit  
o Overvoltage Protection on Outputs with Auto  
Restart  
o Thermal Shutdown  
o Thermally Enhanced 32-Pin TQFN Package  
Other features of the MAX5098A include overvoltage pro-  
tection, short-circuit (hiccup current limit) and thermal  
protection. The MAX5098A is available in a thermally  
enhanced, exposed pad, 5mm x 5mm, 32-pin TQFN  
package and is fully specified over the automotive  
-40°C to +125°C temperature range.  
Dissipates up to 2.7W at +70°C  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
Applications  
Automotive AM/FM Radio Power Supply  
MAX5098AATJ+  
-40°C to +125°C  
32 TQFN-EP*  
+Denotes a lead-free package.  
*EP = Exposed pad.  
Automotive Instrument Cluster Display  
Pin Configuration appears at end of data sheet  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  

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