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MAX1709 PDF预览

MAX1709

更新时间: 2024-11-25 14:57:55
品牌 Logo 应用领域
亚德诺 - ADI DC-DC转换器
页数 文件大小 规格书
13页 312K
描述
4A、低噪声、高频、升压型DC-DC转换器

MAX1709 数据手册

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EVALUATION KIT AVAILABLE  
4A, Low-Noise, High-Frequency,  
Step-Up DC-DC Converter  
MAX1709  
General Description  
Benefits and Features  
The MAX1709 sets a new standard of space savings  
for high-power, step-up DC-DC conversion. It delivers  
up to 20W at a fixed (3.3V or 5V) or adjustable (2.5V to  
5.5V) output, using an on-chip power MOSFET from a  
+0.7V to +5V supply.  
• Integration Reduces External Component Count to  
Save Space  
On-Chip 10A Power MOSFET  
5V, 4A Output from a 3.3V Input  
Fixed 3.3V or 5V Output Voltage or  
Adjustable (2.5V to 5.5V)  
Fixed-frequency PWM operation ensures that the  
switching noise spectrum is constrained to the 600kHz  
fundamental and its harmonics, allowing easy postfilter-  
ing for noise reduction. External clock synchronization  
capability allows for even tighter noise spectrum con-  
trol. Quiescent power consumption is less than 1mW to  
extend operating time in battery-powered systems.  
Input Voltage Range Down to 0.7V  
• Constant Frequency Reduces Post-Filtering  
Low-Noise, Constant-Frequency Operation  
(600kHz)  
Synchronizable Switching Frequency  
(350kHz to 1000kHz)  
Two control inputs (ONA, ONB) allow simple push-on,  
push-off control through a single momentary pushbut-  
ton switch, as well as conventional on/off logic control.  
The MAX1709 also features programmable soft-start  
and current limit for design flexibility and optimum per-  
formance with batteries.  
• Lower Power Consumption Extends Battery Life  
1mW Quiescent Power  
Ordering Information  
The MAX1709 is supplied in both a high-power TSSOP  
package, which allows a 10A  
switch current and a  
RMS  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
16 Narrow SO  
28 TSSOP-EP*  
4A output, and a narrow SO package, which supplies a  
2.4A output with a switch rated at 6A . Although the  
MAX1709ESE  
MAX1709EUI+  
RMS  
narrow SO device has a lower RMS switch rating, it has  
the same peak switch current rating as the TSSOP  
device, and so can supply 4A loads intermittently. If  
loads of 2A or less are required, refer to the MAX1708.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
Applications  
Pin Configuration  
Routers, Servers, Workstations, Card Racks  
Local 2.5V to 3.3V or 5V Conversion  
Local 3.3V to 5V Conversion  
TOP VIEW  
ONA  
LX  
LX  
LX  
LX  
LX  
LX  
LX  
NC  
1
2
3
4
5
6
7
8
9
28 ONB  
27 CLK  
26 3.3/5  
25 NC  
3.6V or 5V RF PAs in Communications Handsets  
MAX1709  
Typical Operating Circuit  
24 NC  
INPUT  
1V TO 5V  
23 PGND  
22 PGND  
21 PGND  
20 PGND  
19 PGND  
18 PGND  
17 NC  
1µH  
OUTPUT  
OFF ON  
3.3V, 5V,  
OR ADJ  
ONA  
CLK  
LX  
NC 10  
GND 11  
MAX1709  
UP TO 4A  
SYNC  
OR  
GND  
OUT  
INTERNAL  
SS/ILM 12  
REF 13  
SS/LIM  
REF  
16 FB  
GND 14  
15 OUT  
TSSOP-EP  
19-1724; Rev 3; 2/15  

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