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
Vrms
q
HIGH ACCURACY:
2% max
q
HIGH EFFICIENCY:
I
GND
= 1mA at I
OUT
= 500mA
Not Enabled: I
GND
= 0.5
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
APPLICATIONS
q
PORTABLE COMMUNICATION DEVICES
q
BATTERY-POWERED EQUIPMENT
q
PERSONAL DIGITAL ASSISTANTS
q
MODEMS
q
BAR-CODE SCANNERS
q
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 regula-
tors with PNP pass devices, quiescent current remains rela-
tively constant over load variations and under dropout con-
ditions.
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
REG103
REG1
03
REG103
SBVS010A JULY 2001
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, 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.
REG103
2
SBVS010A
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Input Voltage, V
IN
....................................................... 0.3V to 16V
Enable Input ............................................................................ 0.3V to V
IN
Error Flag Output ..................................................................... 0.3V to 6V
Error Flag Current ............................................................................... 2mA
Output Short-Circuit Duration ...................................................... Indefinite
Operating Temperature Range ....................................... 55
C to +125
C
Storage Temperature Range .......................................... 65
C to +150
C
Junction Temperature ..................................................... 55
C to +150
C
Lead Temperature (soldering, 3s, SO-8, SOT, and DDPAK) ............... +240
C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
5V Output
REG103FA-5
DDPAK-5
325
40
C to +85
C
REG103FA-5.0
REG103FA-5
Rails
"
"
"
"
"
REG103FA-5/500
Tape and Reel
REG103UA-5
SO-8
182
40
C to +85
C
REG103U50
REG103UA-5
Rails
"
"
"
"
"
REG103UA-5/2K5
Tape and Reel
REG103GA-5
SOT223-5
364
40
C to +85
C
R103G50
REG103GA-5
Rails
"
"
"
"
"
REG103GA-5/2K5
Tape and Reel
3.3V Output
REG103FA-3.3
DDPAK-5
325
40
C to +85
C
REG103FA-3.3
REG103FA-3.3
Rails
"
"
"
"
"
REG103FA-3.3/500
Tape and Reel
REG103UA-3.3
SO-8
182
40
C to +85
C
REG103UA4
REG103UA-3.3
Rails
"
"
"
"
"
REG103UA-3.3/2K5
Tape and Reel
REG103GA-3.3
SOT223-5
364
40
C to +85
C
R103G33
REG103GA-3.3
Rails
"
"
"
"
"
REG103GA-3.3/2K5
Tape and Reel
3.0V Output
REG103FA-3
DDPAK-5
325
40
C to +85
C
REG103FA-3.0
REG103FA-3
Rails
"
"
"
"
"
REG103FA-3/500
Tape and Reel
REG103UA-3
SO-8
182
40
C to +85
C
REG103U30
REG103UA-3
Rails
"
"
"
"
"
REG103UA-3/2K5
Tape and Reel
REG103GA-3
SOT223-5
364
40
C to +85
C
R103G30
REG103GA-3
Rails
"
"
"
"
"
REG103GA-3/2K5
Tape and Reel
2.7V Output
REG103FA-2.7
DDPAK-5
325
40
C to +85
C
REG103FA-2.7
REG103FA-2.7
Rails
"
"
"
"
"
REG103FA-2.7/500
Tape and Reel
REG103UA-2.7
SO-8
182
40
C to +85
C
REG103U27
REG103UA-2.7
Rails
"
"
"
"
"
REG103UA-2.7/2K5
Tape and Reel
REG103GA-2.7
SOT223-5
364
40
C to +85
C
R103G27
REG103GA-2.7
Rails
"
"
"
"
"
REG103GA-2.7/2K5
Tape and Reel
2.5V Output
REG103FA-2.5
DDPAK-5
325
40
C to +85
C
REG103FA-2.5
REG103FA-2.5
Rails
"
"
"
"
"
REG103FA-2.5/500
Tape and Reel
REG103UA-2.5
SO-8
182
40
C to +85
C
REG103U25
REG103UA-2.5
Rails
"
"
"
"
"
REG103UA-2.5/2K5
Tape and Reel
REG103GA-2.5
SOT223-5
364
40
C to +85
C
R103G25
REG103GA-2.5
Rails
"
"
"
"
"
REG103GA-2.5/2K5
Tape and Reel
Adjustable Output
REG103FA-A
DDPAK-5
325
40
C to +85
C
REG103FA-A
REG103FA-A
Rails
"
"
"
"
"
REG103FA-A/500
Tape and Reel
REG103UA-A
SO-8
182
40
C to +85
C
REG103UA
REG103UA-A
Rails
"
"
"
"
"
REG103UA-A/2K5
Tape and Reel
REG103GA-A
SOT223-5
364
40
C to +85
C
R103GA
REG103GA-A
Rails
"
"
"
"
"
REG103GA-A/2K5
Tape and Reel
PACKAGE/ORDERING INFORMATION
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of "REG103UA-5/2K5" will get a single 2500-piece Tape and Reel.
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
RANGE
MARKING
NUMBER
(1)
MEDIA
REG103
3
SBVS010A
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, T
J
= 40
C to +85
C.
At T
J
= +25
C, V
IN
= V
OUT
+ 1V (V
OUT
= 3.0V for REG103-A), V
ENABLE
= 2V, I
OUT
= 10mA, C
NR
= 0.01
F, and C
OUT
= 0.1
F
(1)
, unless otherwise noted.
REG103GA, UA, FA
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE
Output Voltage Range
V
OUT
REG103-2.5
2.5
V
REG103-2.7
2.7
V
REG103-3.0
3.0
V
REG103-3.3
3.3
V
REG103-5
5
V
REG103-A
V
REF
5.5
V
Reference Voltage
V
REF
1.295
V
Adjust Pin Current
I
ADJ
0.2
1
A
Accuracy
0.5
2
%
T
J
= 40
C to +85
C
2.8
%
vs Temperature
dV
OUT
/dT
T
J
= 40
C to +85
C
70
ppm/
C
vs Line and Load
I
OUT
= 10mA to 500mA, V
IN
= (V
OUT
+ 0.7V) to 15V
0.5
2.5
%
T
J
= 40
C to +85
C
V
IN
= (V
OUT
+ 0.9V) to 15V
3.5
%
DC DROPOUT VOLTAGE
(2, 3)
V
DROP
I
OUT
= 10mA
3
25
mV
For all models except 5V
I
OUT
= 500mA
115
200
mV
For 5V model
I
OUT
= 500mA
160
250
mV
For all models except 5V
I
OUT
= 500mA
230
mV
T
J
= 40
C to +85
C
For 5V models
I
OUT
= 500mA
280
mV
T
J
= 40
C to +85
C
VOLTAGE NOISE
f = 10Hz to 100kHz
V
n
Without C
NR
(all models)
C
NR
= 0, C
OUT
= 0
30
Vrms/V V
OUT
Vrms
With C
NR
(all fixed voltage models)
C
NR
= 0.01
F, C
OUT
= 10
F
10
Vrms/V V
OUT
Vrms
OUTPUT CURRENT
Current Limit
(4)
I
CL
550
700
950
mA
T
J
= 40
C to +85
C
500
1000
mA
RIPPLE REJECTION
f = 120Hz
65
dB
ENABLE CONTROL
V
ENABLE
HIGH (output enabled)
V
ENABLE
2
V
IN
V
V
ENABLE
LOW (output disabled)
0.2
0.5
V
I
ENABLE
HIGH (output enabled)
I
ENABLE
V
ENABLE
= 2V to V
IN
, V
IN
= 2.1V to 6.5
(5)
1
100
nA
I
ENABLE
LOW (output disabled)
V
ENABLE
= 0V to 0.5V
2
100
nA
Output Disable Time
50
s
Output Enable Soft Start Time
1.5
ms
ERROR FLAG
(6)
Current, Logic HIGH (open drain)--Normal Operation
V
IN
= V
ERROR
= V
OUT
+ 1V
0.1
10
A
Voltage, Logic LOW--On Error
Sinking 500
A
0.2
0.4
V
THERMAL SHUTDOWN
Junction Temperature
Shutdown
150
C
Reset from Shutdown
130
C
GROUND PIN CURRENT
Ground Pin Current
I
GND
I
OUT
= 10mA
0.5
0.7
mA
I
OUT
= 500mA
1
1.3
mA
ENABLE Pin LOW
V
ENABLE
0.5V
0.5
A
INPUT VOLTAGE
V
IN
Operating Input Voltage Range
(7)
2.1
15
V
Specified Input Voltage Range
V
IN
> 2.7V
V
OUT
+ 0.7
15
V
T
J
= 40
C to +85
C
V
IN
> 2.9V
V
OUT
+ 0.9
15
V
TEMPERATURE RANGE
Specified Range
T
J
40
+85
C
Operating Range
55
+125
C
Storage Range
65
+150
C
Thermal Resistance
DDPAK-5 Surface-Mount
JC
Junction-to-Case
4
C/W
SO-8 Surface-Mount
JA
Junction-to-Ambient
150
C/W
SOT223-5 Surface-Mount
JC
Junction-to-Case
15
C/W
NOTES: (1) The REG103 does not require a minimum output capacitor for stability. However, transient response can be improved with proper capacitor selection.
(2) Dropout voltage is defined as the input voltage minus the output voltage that produces a 2% change in the output voltage from the value at V
IN
= V
OUT
+ 1V at fixed load.
(3) Not applicable for V
OUT
less than 2.7V. (4) Current limit is the output current that produces a 10% change in output voltage from V
IN
= V
OUT
+ 1V and I
OUT
= 10mA.
(4) For V
IN
> 6.5V, see typical characteristic "V
ENABLE
vs I
ENABLE
." (6) Logic low indicates out-of-regulation condition by approximately 10%, or thermal shutdown. (7) The
REG103 no longer regulates when V
IN
< V
OUT
+ V
DROP (MAX)
. In drop-out or when the input voltage is between 2.7V and 2.1V, the impedance from V
IN
to V
OUT
is typically
less than 1
at T
J
= +25
C. See typical characteristic.
REG103
4
SBVS010A
PIN CONFIGURATIONS
Top View
V
OUT
V
OUT
NR/Adjust
(1)
GND
V
IN
V
IN
ERROR
ENABLE
SO-8
1
2
3
4
8
7
6
5
NOTE: (1) For REG103A-A: voltage setting resistor pin.
All other models: noise reduction capacitor pin.
GND
ENABLE
V
IN
NR/Adjust
(1)
V
O
1 2 3 4 5
DDPAK-5
SOT223-5
(U Package)
(F Package)
(G Package)
Tab is GND
Tab is GND
ENABLE
NR/Adjust
(1)
GND
V
IN
1
2
3
4
5
V
OUT
REG103
5
SBVS010A
TYPICAL CHARACTERISTICS
For all models, at T
J
= +25
C and V
ENABLE
= 2V, unless otherwise noted.
100
0
200
300
400
500
0.5
0
0.5
1.0
1.5
Output Voltage Change (%)
I
OUT
(mA)
OUTPUT VOLTAGE CHANGE vs I
OUT
(V
IN
= V
OUT
+ 1V, Output Voltage % Change
Refered to I
OUT
= 10mA at +25
C)
= 55
C
= +25
C
= +125
C
100
0
200
300
400
500
180
160
140
120
100
80
60
40
20
0
DC Dropout Voltage (mV)
Output Current (mA)
DC DROPOUT VOLTAGE vs OUTPUT CURRENT
= 55
C
= +25
C
= +125
C
75
25
50
25
0
50
75
100
125
0.1
0.5
0
0.5
1
1.5
Output Voltage Change (%)
Temperature (
C)
OUTPUT VOLTAGE vs TEMPERATURE
(Output Voltage % Change Referred to
I
OUT
= 10mA at +25
C)
= 10mA
= 100mA
= 500mA
75
25
50
25
0
50
75
100
125
160
120
80
40
0
DC Dropout Voltage (mV)
Temperature (
C)
DC DROPOUT VOLTAGE vs TEMPERATURE
= 10mA
= 100mA
= 500mA
75
25
50
25
0
50
75
100
125
0.5
0.4
0.3
0.2
0.1
0
Output Voltage Change (%)
Temperature (
C)
LINE REGULATION vs TEMPERATURE
(V
IN
= V
OUT
+ 1V to V
IN
= 15V )
= 10mA
= 100mA
0
2
4
6
10
8
0.5
0
0.5
1.0
1.5
Output Voltage Change (%)
Input Voltage Above V
OUT
OUTPUT VOLTAGE CHANGE vs V
IN
(Output Voltage % Change Refered
to V
IN
= V
OUT
+ 1V at I
OUT
= 10mA)
= 10mA
= 100mA
= 500mA
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