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REG103UA-2.5/2K5G4 参数 Datasheet PDF下载

REG103UA-2.5/2K5G4图片预览
型号: REG103UA-2.5/2K5G4
PDF下载: 下载PDF文件 查看货源
内容描述: 500毫安低压差稳压器 [500mA Low-Dropout Regulator]
分类和应用: 稳压器
文件页数/大小: 26 页 / 937 K
品牌: TI [ TEXAS INSTRUMENTS ]
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R EG
103
REG
103
REG103
REG
103
SBVS010D – JANUARY 2000 – REVISED SEPTEMBER 2005
DMOS
500mA Low-Dropout Regulator
FEATURES
q
NEW DMOS TOPOLOGY:
Ultra Low Dropout Voltage:
115mV Typ at 500mA and 3.3V Output
Output Capacitor NOT Required for Stability
q
FAST TRANSIENT RESPONSE
q
VERY LOW NOISE: 33
µ
Vrms
q
HIGH ACCURACY:
±
2% max
q
HIGH EFFICIENCY:
I
GND
= 1mA at I
OUT
= 500mA
Not Enabled: I
GND
= 0.5
µ
A
q
2.5V, 2.7V, 3.0V, 3.3V, 5.0V, AND ADJUSTABLE
OUTPUT VERSIONS
q
FOLDBACK CURRENT LIMIT
q
THERMAL PROTECTION
q
OUTPUT VOLTAGE ERROR INDICATOR
(1)
q
SMALL SURFACE-MOUNT PACKAGES:
SOT223-5, DDPAK-5, SO-8
DESCRIPTION
The REG103 is a family of low-noise, low-dropout, linear
regulators with low ground pin current. Its new DMOS
topology provides significant improvement over previous
designs, including low-dropout voltage (only 115mV typ at
full load), and better transient performance. In addition, no
output capacitor is required for stability, unlike conventional
low-dropout regulators that are difficult to compensate and
require expensive low ESR capacitors greater than 1µF.
Typical ground pin current is only 1mA (at I
OUT
= 500mA)
and drops to 0.5µA in
not enabled
mode. Unlike regulators
with PNP pass devices, quiescent current remains relatively
constant over load variations and under dropout conditions.
The REG103 has very low output noise (typically 33µVrms
for V
OUT
= 3.3V with C
NR
= 0.01µF), making it ideal for use
in portable communications equipment. On-chip trimming
results in high output voltage accuracy. Accuracy is main-
tained over temperature, line, and load variations. Key
parameters are tested over the specified temperature range
(–40°C to +85°C).
The SO-8 version of the REG103 has an ERROR pin that
provides a
power good
flag, indicating the regulator is in
regulation. The REG103 is well protected—internal cir-
cuitry provides a current limit that protects the load from
damage. Thermal protection circuitry keeps the chip from
being damaged by excessive temperature. In addition to the
SO-8 package, the REG103 is also available in the DDPAK
and the SOT223-5.
APPLICATIONS
q
q
q
q
q
q
PORTABLE COMMUNICATION DEVICES
BATTERY-POWERED EQUIPMENT
PERSONAL DIGITAL ASSISTANTS
MODEMS
BAR-CODE SCANNERS
BACKUP POWER SUPPLIES
ENABLE
V
IN
+
0.1µF
REG103
(Fixed Voltage
Versions)
Gnd
+
ERROR
(1)
V
OUT
C
OUT(2)
V
IN
ENABLE
ERROR
1)
V
OUT
+
0.1µF
REG103-A
R
1
Adj
+
C
OUT(2)
NR
NR = Noise Reduction
Gnd
R
2
NOTE: (1) SO-8 Package Only. (2) Optional.
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000-2005, Texas Instruments Incorporated
www.ti.com