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D412F

更新时间： 2024-09-24 06:52:11
品牌 Logo 应用领域
美信 - MAXIM 转换器
页数 文件大小 规格书
12页 276K
描述
16μA IQ, 1.2A PWM Step-Down DC-DC Converters

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19-3336; Rev 2; 6/10  
16µA I , 1.2A PWM  
Q
Step-Down DC-DC Converters  
6/MAX157  
General Description  
Features  
The MAX1556/MAX1556A/MAX1557 are low-operating-  
current (16µA), fixed-frequency step-down regulators.  
High efficiency, low-quiescent operating current, low  
dropout, and minimal (27µA) quiescent current in  
dropout make these converters ideal for powering  
portable devices from 1-cell Li-ion or 3-cell alkaline/NiMH  
batteries. The MAX1556 delivers up to 1.2A; has pin-  
selectable 1.8V, 2.5V, and 3.3V outputs; and is also  
adjustable. The MAX1557 delivers up to 600mA; has pin-  
selectable 1V, 1.3V, and 1.5V outputs; and is also  
adjustable.  
o Up to 97% Efficiency  
o 95% Efficiency at 1mA Load Current  
o Low 16µA Quiescent Current  
o 1MHz PWM Switching  
o Tiny 3.3µH Inductor  
o Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V,  
and Adjustable Output  
o 1.2A Guaranteed Output Current  
(MAX1556/MAX1556A)  
The MAX1556/MAX1556A/MAX1557 contain a low-on-  
resistance internal MOSFET switch and synchronous  
rectifier to maximize efficiency and dropout perfor-  
mance while minimizing external component count. A  
proprietary topology offers the benefits of a high fixed-  
frequency operation while still providing excellent effi-  
ciency at both light and full loads. A 1MHz PWM  
switching frequency keeps components small. Both  
devices also feature an adjustable soft-start to minimize  
battery transient loading.  
o Voltage Positioning Optimizes Load-Transient  
Response  
o Low 27µA Quiescent Current in Dropout  
o Low 0.1µA Shutdown Current  
o No External Schottky Diode Required  
o Analog Soft-Start with Zero Overshoot Current  
o Small, 10-Pin, 3mm x 3mm TDFN Package  
The MAX1556/MAX1556A/MAX1557 are available in a  
tiny 10-pin TDFN (3mm x 3mm) package.  
Ordering Information  
TOP  
MARK  
Applications  
PART  
TEMP RANGE PIN-PACKAGE  
PDAs and Palmtop Computers  
Cell Phones and Smart Phones  
Digital Cameras and Camcorders  
Portable MP3 and DVD Players  
Hand-Held Instruments  
MAX1556ETB+  
-40°C to +85°C 10 TDFN-EP*  
ACQ  
AUJ  
ACR  
MAX1556AETB+ -40°C to +85°C 10 TDFN-EP*  
MAX1557ETB+ -40°C to +85°C 10 TDFN-EP*  
*EP = Exposed paddle.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Typical Operating Circuit  
Pin Configuration  
OUTPUT  
0.75V TO V  
TOP VIEW  
INPUT  
2.6V TO 5.5V  
IN  
INP  
LX  
MAX1556  
MAX1556A  
MAX1557  
1
2
3
4
5
IN  
10 D1  
GND  
SS  
INP  
LX  
9
8
7
6
IN  
PGND  
MAX1556  
MAX1556A  
MAX1557  
D1  
D2  
VOLTAGE  
SELECT  
PGND  
D2  
OUT  
SHDN  
OUT  
SS  
ON  
OFF  
SHDN  
GND  
TDFN  
________________________________________________________________ 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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