REG103FA-3.3
DMOS 500mA Low Dropout Regulator

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Datasheet

Size: 166.13KB
Page: 19
PDF: REG103FA-3.3.pdf
  • Description:
    DMOS 500mA Low Dropout Regulator
  • MFG:
    BURR-BROWN [Burr-Brown Corporation]
 

Abstract


DMOS
500mA Low-Dropout Regulator
FEATURES
a71 NEW DMOS TOPOLOGY:
Ultra Low Dropout Voltage:
115mV Typ at 500mA and 3.3V Output
Output Capacitor NOT Required for Stability
a71 FAST TRANSIENT RESPONSE
a71 VERY LOW NOISE: 33?Vrms
a71 HIGH ACCURACY: ±2% max
a71 HIGH EFFICIENCY:
I
GND
= 1mA at I
OUT
= 500mA
Not Enabled: I
GND
= 0.5?A
a71 2.5V, 2.7V, 3.0V, 3.3V, 5.0V, AND ADJUSTABLE
OUTPUT VERSIONS
a71 FOLDBACK CURRENT LIMIT
a71 THERMAL PROTECTION
a71 OUTPUT VOLTAGE ERROR INDICATOR
(1)
a71 SMALL SURFACE-MOUNT PACKAGES:
SOT223-5, DDPAK-5, SO-8
APPLICATIONS
a71 PORTABLE COMMUNICATION DEVICES
a71 BATTERY-POWERED EQUIPMENT
a71 PERSONAL DIGITAL ASSISTANTS
a71 MODEMS
a71 BAR-CODE SCANNERS
a71 BACKUP POWER SUPPLIES
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 1?F.
Typical ground pin current is only 1mA (at I
OUT
= 500mA)
and drops to 0.5?A 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 33?Vrms
for V
OUT
= 3.3V with C
NR
= 0.01?F), 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.
REG103
(Fixed Voltage
Versions)
ENABLE
Gnd
0.1?F
C
OUT
(2)
+
+
V
OUT
V
IN
NR
NR = Noise Reduction
NOTE: (1) SO-8 Package Only. (2) Optional.
ERROR
(1)
ERROR
1)
REG103-A
Gnd
ENABLE
0.1?F
+
C
OUT
(2)
+
V
OUT
V
IN
R
2
R
1
Adj
REG103
R
EG
10
3
RE
G1
03
REG103
SBVS010B – JANUARY 2000 – REVISED FEBRUARY 2004
www.ti.com
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 ? 2000-2004, Texas Instruments Incorporated
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.

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