Datasheet.kr   

A840 데이터시트 PDF




Allegro MicroSystems에서 제조한 전자 부품 A840은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 A840 자료 제공

부품번호 A840 기능
기능 LOW-DROPOUT REGULATORS . HIGH EFFICIENCY
제조업체 Allegro MicroSystems
로고 Allegro MicroSystems 로고


A840 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 8 페이지수

미리보기를 사용할 수 없습니다

A840 데이터시트, 핀배열, 회로
8405
PRELIMINARY INFORMATION
(subject to change without notice)
June 25, 1999
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular tele-
phones, the A8405SLH voltage regulators offer the reduced dropout
voltage and quiescent current essential for maximum battery life.
54
Applicable also to palmtop computers and personal data assistants,
these devices deliver a regulated output at up to 200 mA (transient),
which is internally limited, providing short-circuit protection. Regu-
lated output voltages of 2.7, 2.8, 3.0, 3.2, 3.3, 3.6, 3.8, 4.0, and 5.0 V
VR
UCT1 2
3
ROD NLYDwg.PS-021-6
P O*BYPASS (fixed regulators) or
D EADJUST (A8405SLH-ADJ only).
TINUEERENCABSOLUTE MAXIMUM RATINGS
N FInput Voltage, VI . . . . . . . . . . . . . . . 7 V
O EPeak Output Current,
C RIOM . . . . . . . . . . . . . . . . . . 200 mA*
Enable Input Voltage, VE . . . . . . . . . . VI
IS ROperating Temperature Range,
TA . . . . . . . . . . . . . -20°C to +85°C
D OJunction Temperature, TJ . . . . +150°C
FStorage Temperature Range,
TS . . . . . . . . . . . . -40°C to +150°C
* Output current rating is limited by input
voltage, duty cycle, and ambient temperature.
are currently provided. Other voltages, down to 2.0 volts, are available
on special order.
A PMOS pass element provides a typical dropout voltage of only
100 mV at 100 mA of load current. The low dropout voltage permits
deeper battery discharge before output regulation is lost. Quiescent
current does not increase significantly as the dropout voltage is ap-
proached, an ideal feature in standby/resume power systems where data
integrity is crucial. Regulator accuracy and excellent temperature
characteristics are provided by a bandgap reference. The A8405SLH
includes an ENABLE input to give the designer complete control over
power up, standby, or power down.
These devices are supplied in a thermally enhanced 5-lead small-
outline plastic package similar to the SOT-23, and fitting the SC-74A
footprint. All devices are rated for operation over a temperature range
of -20°C to +85°C.
FEATURES AND BENEFITS
I High Efficiency Provides Extended Battery Life
I 100 mV Typical Dropout Voltage at IO = 100 mA
I 80 µA Typical Quiescent Current
I Low Output Noise
I 200 mA Current-Limited Output
I Improved PSRR and Transient Performance
APPLICATIONS
I Cordless/Cellular/GSM/PHS Telephones
I Personal Data Assistants
I Personal Communicators
I Palmtop Computers
I GPS
I Pagers
Under any set of conditions, do not exceed a
junction temperature of +150°C. See follow-
Always order by complete part number, e.g., A8405SLH-xx , where “xx”
ing pages.
is the required output voltage in tenths or “ADJ” for adjustable.




A840 pdf, 반도체, 판매, 대치품
8405
LOW-DROPOUT
REGULATORS
APPLICATIONS INFORMATION
Linear regulators require input and output capacitors in order to
maintain over-all loop stability. The recommended minimum
value for the input capacitor is 0.1 µF. The output capacitor is
the dominant pole that provides the high-frequency compensa-
tion required for over-all regulator loop stability. These devices
are stable with as little as 1 µF. However, to ensure stable
operation under all conditions and capacitor types, the recom-
mended minimum value is 4.7 µF. The output capacitor may be
partially distributed through the load circuits. However, at least
1 µF should be connected at the regulator using the shortest and
widest foil pattern possible.
The A8405SLH-ADJ requires an external voltage divider to set
up the desired regulated output voltage between 2.0 V and 6.8 V
(VI 7 V). The two resistors are chosen such that
VO = 1.26 (R1 + R2)/R2.
The resistor values are usually as high as possible to maintain
high circuit efficiency, but R2 should be less than 300 k.
INPUT
(7.0 V MAX)
0.1 µF
(MIN)
OUTPUT (2.0 V TO 6.8 V)
1 µF
VR (MIN)
R1
ENABLE
(ACTIVE HIGH)
R2
(300 kMAX)
Thermal Considerations
These devices are intended to provide more than 150 mA of
continuous current in a very small package. The table on page 2
of this data sheet gives the maximum allowable average output
current for a worst-case printed circuit design (RθJA = 220°C/W
with a minimum footprint). Performance improvement is easily
accomplished with the addition of 1 square inch of copper at
terminal 2 (RθJA = 170°C/W).
Dwg. ES-015
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

4페이지










A840 전자부품, 판매, 대치품
8405
LOW-DROPOUT
REGULATORS
This page intentionally left blank
www.allegromicro.com

7페이지


구       성 총 8 페이지수
다운로드[ A840.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
A840

NPN SILICON EPITAXIAL TRANSISTOR WITH 2 DIFFERENT ELEMENTS IN A FLAT-LEAD 6-PIN THIN-TYPE ULTRA SUPER MINIMOLD PACKAGE

NEC
NEC
A840

DUAL BRIDGE DRIVER

Toshiba Semiconductor
Toshiba Semiconductor

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵