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UCC2941N-5

更新时间： 2024-11-07 23:39:03
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其他 - ETC 开关光电二极管信息通信管理
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UCC2941N-5 数据手册

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SLUS242B – JANUARY 1999 – REVISED JUNE 2001  
D OR N PACKAGE  
(TOP VIEW)  
D
1-V Input Voltage Operation Start-up  
Ensured Under Full Load on Main Output  
With Operation Down to 0.4 V  
VOUT  
VGD  
VIN  
SW  
1
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4
8
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5
D
D
Input Voltage Range of 1 V to V  
+ 0.5 V  
OUT  
PGND  
SGND  
PLIM  
500-mW Output Power at Battery Voltages  
as Low as 0.8 V  
SD  
D
D
D
D
Secondary 9-V Supply From a Single  
Inductor  
UCC3941–ADJ ONLY  
(TOP VIEW)  
Adjustable Output Power Limit Control  
Output Fully Disconnected in Shutdown  
VOUT  
VGD  
VIN  
SW  
1
2
3
4
8
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6
5
Adaptive Current-Mode Control for  
Optimum Efficiency  
PGND  
FB  
D
8-µA Shutdown Supply Current  
SD  
PLIM  
description  
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 3.3-V, 5-V, or an adjustable output at 500 mW. The UCC3941 family  
also provides an auxiliary 9-V, 100-mW output, primarily for the gate drive supply, which can be used for  
applications requiring an auxiliary output such as a 5-V supply by linear regulating. The primary output starts  
up under full load at input voltages typically as low as 0.8 V, with a guaranteed maximum of 1 V, and operates  
down to 0.4 V once the converter is operating, maximizing battery utilization.  
Demanding applications such as pagers and personal digital assistants require high efficiency from several  
milliwatts to several hundred milliwatts, 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  
0.25-Ω charge switch, and the 0.4-Ω synchronous rectifier, along with continuous-mode conduction, provide  
high efficiency. The wide input-voltage range on the UCC3941 family can accommodate other power sources  
such as NiCd and NiMH.  
Other features include maximum power control and shutdown control. The device is available in 8-pin SOIC (D)  
and 8-pin DIP (N).  
AVAILABLE OPTIONS  
PACKAGED DEVICES  
†
SOIC (D)  
DIP (N)  
5.0  
T
A
V
(V)  
OUT  
Adjustable  
(1.3 V to 6 V)  
Adjustable  
(1.3 V to 6 V)  
3.3  
5.0  
3.3  
–40_C to 85_C  
0_C to 70_C  
UCC2941D–3 UCC2941D–5 UCC2941D–ADJ UCC2941N–3 UCC2941N–5 UCC2941N–ADJ  
UCC3941D–3 UCC3941D–5 UCC3941D–ADJ UCC3941N–3 UCC3941N–5 UCC3941N–ADJ  
†
The SOIC (D) package is available left end taped and reeled. Add an R suffix to the device type (e.g., UCC2941DR–3) to order  
quantities of 2500 devices per reel.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
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Copyright 2001, Texas Instruments Incorporated  
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