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UCC3941 PDF预览

UCC3941

更新时间: 2024-11-07 22:39:59
品牌 Logo 应用领域
其他 - ETC 转换器升压转换器
页数 文件大小 规格书
11页 192K
描述
1V Synchronous Boost Converter

UCC3941 数据手册

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application  
INFO  
UCC2941-3/-5/-ADJ  
UCC3941-3/-5/-ADJ  
available  
1V Synchronous Boost Converter  
FEATURES  
DESCRIPTION  
1V Input Voltage Operation Startup  
Guaranteed Under Full Load on Main  
Output With Operation Down to 0.4V  
The UCC3941 family of low input voltage single inductor boost converters  
are optimized to operate from a single or dual alkaline cell, and step up to  
a 3.3V, 5V, or an adjustable output at 500mW. The UCC3941 family also  
provides an auxiliary 9V 100mW output, primarily for the gate drive supply,  
which can be used for applications requiring an auxiliary output such as a  
5V supply by linear regulating. The primary output will start up under full  
load at input voltages typically as low as 0.8V, with a guaranteed maximum  
of 1V, and will operate down to 0.4V once the converter is operating, maxi-  
mizing battery utilization.  
Input Voltage Range of 1V to VOUT  
+
0.5V  
500mW Output Power at Battery  
Voltages as Low as 0.8V  
Secondary 9V Supply From a Single  
Inductor  
Demanding applications such as Pagers and PDA’s require high efficiency  
from several milli-watts to several hundred milli-watts, and the UCC3941  
family accommodates these applications with >80% typical efficiencies  
over the wide range of operation. The high efficiency at low output current  
is achieved by optimizing switching and conduction losses along with low  
quiescent current. At higher output current the 0.25switch, and 0.4syn-  
chronous rectifier, along with continuous mode conduction, provide high ef-  
ficiency. The wide input voltage range on the UCC3941 family can  
accommodate other power sources such as NiCd and NiMH.  
Adjustable Output Power Limit Control  
Output Fully Disconnected in  
Shutdown  
Adaptive Current Mode Control for  
Optimum Efficiency  
8µA Shutdown Supply Current  
Other features include maximum power control and shutdown control.  
Packages available are the 8-pin SOIC (D) and 8-pin DIP (N or J).  
SIMPLIFIED BLOCK DIAGRAM AND APPLICATION CIRCUIT  
+
10µF  
0.8V TO VOUT +0.5V  
22µH  
VIN  
3
SW  
UCC3941-3 = 3.3V  
UCC3941-5 = 5.0V  
UCC3941-ADJ = 1.30V TO 6V  
VOUT  
8
8V  
VGD  
0.4  
STARTUP  
2
1
CIRCUITRY  
10µF  
0.25  
100µF  
MODULATOR CONTROL CIRCUIT  
SYNCHRONOUS RECTIFICATION CIRCUITRY  
ANTI-CROSS CONDUCTION  
STARTUP  
MULTIPLEXING LOGIC  
MAXIMUM INPUT POWER CONTROL  
ADAPTIVE CURRENT CONTROL  
PLIM  
5
SD  
4
*SGND/FB  
6
OPEN=SD  
UCC3941-ADJ  
1.25V  
+
PGND  
7
*FOR UCC3941-ADJ ONLY:  
PIN 7 = SGND & PGND, PIN 6 = OUTPUT SENSE FEEDBACK, FB.  
UDG-98147  
SLUS242 - JULY 1999  

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