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A1117 데이터시트 PDF




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부품번호 A1117 기능
기능 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT
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A1117 데이터시트, 핀배열, 회로
AiT Semiconductor Inc.
www.ait-ic.com
A1117
1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL PROTECTION AND 1.4A CURRENT LIMIT
DESCRIPTION
The A1117 is designed to provide 1A for requiring
high efficiency applications.
FEATURES
Output Current of 1A Maximum
Three-Terminal Adjustable or Fixed Outputs
The A1117 series of positive fixed voltage (VOUT =
1.8V, 2.5V, 2.8V, 3.3V, 5V) and adjustable version,
which can provide an output voltage from 1.25V to
13.8V with only two external resistors.
Maximum Input Voltage: 15V
Fast Transient Response
Current Limit, Safe Operating and Thermal
Shutdown Protection
The A1117 offers current limiting and thermal
protection to assure the stability of chip and power
system. And the on chip trimming technique to
guarantee output voltage accuracy within ±2%.
The A1117 is available in SOT-223 and TO-252
packages.
Line Regulation: 0.2%
Load Regulation: 0.4%
Environment Temperature: -50oC~+140oC
Available in SOT-223 and TO-252 Package.
APPLICATION
High Efficiency Linear Regulators
Post Regulator for Switching DC/DC Converter
Power Management for M/B and Graphic Card
TYPICAL APPLICATION
2.85V Model for SCSI-2 Active Termination
Battery Charger
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
ORDERING INFORMATION
Adjustable Output Version
VOUT=VREF(1+R2/R1)+IADJ*R2
The output of A1117-ADJ provides any output voltage between
1.25V~13.8V can be available by choosing two external resistors.
Fixed Output Version
Package Type
Part Number
A1117NR-XX
SOT-223
TO-252
N A1117NVR-XX
A1117NR-ADJ
A1117NVR-ADJ
A1117DR-XX
A1117DVR-XX
D A1117DR-ADJ
A1117DVR-ADJ
XX: Output Voltage, 33=3.3V, 50=5V,
NOTE
ADJ: Adjustable
R: Tape & Reel
V: GREEN PACKAGE
AiT provides all Pb free products
Suffix “ V” means Green Package
REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED -
-1-




A1117 pdf, 반도체, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A1117
1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL PROTECTION AND 1.4A CURRENT LIMIT
TYPICAL PERFORMANCE CHARACTERISTICS
1.Load Regulation
VOUT=3.3V
2.Load Regulation vs. Temperature
IOUT form 10mA to 1A
3.Line Regulation
VOUT=3.3V, IOUT=10mA
4.Dropout Voltage
TA=25oC, 90oC
5.Output Voltage vs. Temperature
6.Adjustable Pin Current vs. Temperature
REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED -
-4-

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A1117 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A1117
1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL PROTECTION AND 1.4A CURRENT LIMIT
Adjustable Output Version
A1117 has adjustable & fixed output version, Fig 2. is typical adjustable output version application. The A1117
adjustable version provides 1.25V reference voltage. Any output voltage between 1.25V~13.8V can be
available by choosing two external resistors (R1 & R2, connection method is showed in Fig 2.)
Fig2. Adjustable Output Version
The output voltage of adjustable version satisfies this followed equation:
VOUT=VREF*(1+R2/R1) + IADJ*R2.
We can ignore IADJ because IADJ (about 50uA) is much less than the current of R1 (about 4mA).
The value of R1 should be I the range of 200Ω~350Ω to assure chip working normally without any load. To
assure the electrical performance, the output current should be larger than 5mA. If R1 is too large, the
minimum output current should be larger than 4mA. The best working condition is to assure that the output
current exceeds 10mA.
Using a bypass capacitor (CADJ) between the adjust terminal and ground can improve ripple
rejection, This bypass capacitor prevents ripple from being amplified as the output voltage
is increased. The impedance of CADJ should be less than the resistor’s (R1) which is
between output and adjust pins to prevent ripple from being amplified at any ripple
frequency. As R1 is normally in the range of 200Ω~350Ω,the value of CADJ should satisfy
this equation:
2*FRIPPLE*CADJ<R1. Recommend using 10uF tan capacitor.
REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED -
-7-

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