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MAX5090A

更新时间： 2024-11-19 03:53:59
品牌 Logo 应用领域
美信 - MAXIM 转换器
页数 文件大小 规格书
17页 658K
描述
2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters

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MAX5090A 数据手册

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19-3872; Rev 0; 3/06  
2A, 76V, High-Efficiency  
MAXPower Step-Down DC-DC Converters  
General Description  
Features  
♦ Wide Input Voltage Range: 6.5V to 76V  
The MAX5090A/B/C easy-to-use, high-efficiency, high-  
voltage step-down DC-DC converters operate from an  
input voltage up to 76V, and consume only 310µA qui-  
escent current at no load. This pulse-width-modulated  
(PWM) converter operates at a fixed 127kHz switching  
frequency at heavy loads, and automatically switches  
to pulse-skipping mode to provide low quiescent cur-  
rent and high efficiency at light loads. The MAX5090  
includes internal frequency compensation simplifying  
circuit implementation. The device can also be syn-  
chronized with external system clock frequency in a  
noise-sensitive application. The MAX5090 uses an  
internal low on-resistance and a high-voltage DMOS  
transistor to obtain high efficiency and reduce overall  
system cost. This device includes undervoltage lock-  
out, cycle-by-cycle current limit, hiccup-mode output  
short-circuit protection, and overtemperature shutdown.  
♦ Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)  
Output-Voltage Versions  
♦ 2A Output Current  
♦ Efficiency Up to 92%  
♦ Internal 0.26Ω High-Side DMOS FET  
♦ 310µA Quiescent Current at No Load  
♦ 19µA Shutdown Current  
♦ Internal Frequency Compensation  
♦ Fixed 127kHz Switching Frequency  
♦ External Frequency Synchronization  
♦ Thermal Shutdown and Short-Circuit Current Limit  
♦ -40°C to +125°C Automotive Temperature Range  
♦ 16-Pin (5mm x 5mm) Thin QFN Package  
♦ Capable of Dissipating 2.67W at +70°C  
The MAX5090 delivers up to 2A output current. External  
shutdown is included, featuring 19µA (typ) shutdown  
current. The MAX5090A/MAX5090B versions have fixed  
output voltages of 3.3V and 5V, respectively, while the  
MAX5090C features an adjustable 1.265V to 11V output  
voltage.  
Ordering Information  
OUTPUT  
VOLTAGE  
(V)  
TEMP  
RANGE  
PIN-  
PACKAGE*  
PART  
The MAX5090 is available in a space-saving 16-pin thin  
QFN package (5mm x 5mm) and operates over the  
automotive temperature range (-40°C to +125°C).  
MAX5090AATE+ -40°C to +125°C 16 TQFN-EP**  
3.3  
MAX5090AATE -40°C to +125°C 16 TQFN-EP**  
MAX5090BATE+ -40°C to +125°C 16 TQFN-EP**  
MAX5090BATE -40°C to +125°C 16 TQFN-EP**  
3.3  
5.0  
5.0  
Applications  
Automotive  
Industrial  
Ordering Information continued at end of data sheet.  
*The package code is T1655-3.  
**EP = Exposed pad.  
Distributed Power  
+Denotes lead-free package.  
Typical Operating Circuit  
Pin Configuration  
TOP VIEW  
12  
EP  
11  
10  
9
V
IN  
7.5V TO 76V  
R
IN  
10Ω  
FB  
C
IN  
68µF  
8
7
6
5
DRAIN 13  
DRAIN 14  
N.C. 15  
C
BYPASS  
0.47µF  
V
OUT  
100µH  
5V/2A  
V
DRAIN  
IN  
SS  
LX  
MA5090  
ON/OFF  
C
C
BST  
0.22µF  
OUT  
100µF  
D1  
PDS5100H  
SYNC  
VD  
BST  
FB  
MAX5090B  
16  
N.C.  
SS  
SYNC  
SGND  
C
SS  
VD  
0.047µF  
PGND  
1
2
3
4
3.3µF  
TQFN  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...17

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