Datasheet > UCC3945-ADJ

UCC3945-ADJ

更新时间： 2024-11-23 21:53:51

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

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中文翻译

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数据手册

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UCC3945-ADJ 数据手册

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 V_OUT

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 0.25Ω switch, and 0.4Ω syn-

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

UCC3941-3 = 3.3V

UCC3941-5 = 5.0V

UCC3941-ADJ = 1.30V TO 6V

VOUT

VGD

0.4Ω

STARTUP

CIRCUITRY

10µF

0.25Ω

100µF

MODULATOR CONTROL CIRCUIT

SYNCHRONOUS RECTIFICATION CIRCUITRY

ANTI-CROSS CONDUCTION

STARTUP

MULTIPLEXING LOGIC

MAXIMUM INPUT POWER CONTROL

ADAPTIVE CURRENT CONTROL

PLIM

*SGND/FB

OPEN=SD

UCC3941-ADJ

1.25V

–

PGND

*FOR UCC3941-ADJ ONLY:

PIN 7 = SGND & PGND, PIN 6 = OUTPUT SENSE FEEDBACK, FB.

UDG-98147

SLUS242 - JULY 1999

12 3 4 5 6 7...11

中文翻译

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