1A Ultra Low Dropout Linear Regulator
FEATURES
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•
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•
•
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Ultra Low Dropout Voltage
Compatible with low ESR MLCC as Input/Output Capacitor
Good Line and Load Regulation
Guaranteed Output Current of 1A
Available in SOT-223 and TO-252 Packages
Fixed Output Voltages : 1.0V, 1.2V, 1.8V, 2.5V, and 3.3V
Over-Temperature/Over-Current Protection
-40
ºC
to 125
ºC
Junction Temperature Range
TJ4940
SOT-223 3L
APPLICATION
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LCD TVs and SETTOP Boxes
Battery Powered Equipments
Motherboards and Graphic Cards
Microprocessor Power Supplies
Peripheral Cards
High Efficiency Linear Regulators
Battery Chargers
TO252 3L PKG
ORDERING INFORMATION
Device
Package
SOT-223 3L
TO-252 3L
DESCRIPTION
The TJ4940 series of high performance ultra-low dropout
linear regulators operates from 2.5V to 6V input supply and
provides ultra-low dropout voltage, high output current with
low ground current. Wide range of preset output voltage
options are available. These ultra-low dropout linear
regulators respond fast to step changes in load which
makes them suitable for low voltage micro-processor
applications. The TJ4940 is developed on a CMOS process
technology which allows low quiescent current operation
independent of output load current. This CMOS process
also allows the TJ4940 to operate under extremely low
dropout conditions.
TJ4940xS-X.X
TJ4940GRS-X.X
X.X = Output Voltage = 1.0, 1.2, 1.8, 2.5, and 3.3
Absolute Maximum Ratings
CHARACTERISTIC
Input Supply Voltage (Survival)
Maximum Output Current
Lead Temperature (Soldering, 5 sec)
Storage Temperature Range
Operating Junction Temperature Range
SYMBOL
V
IN
I
MAX
T
SOL
T
STG
T
JOPR
MIN.
-
-
-65
-40
MAX.
6.5
1
260
150
125
UNIT
V
A
ºC
ºC
ºC
* Calculated from package in still air, mounted to 2.6mm X 3.5mm(minimum foot print) 2 layer PCB without thermal vias per JESD51 standards.
Jul. 2011 – Preliminary
1/8
HTC
1A Ultra Low Dropout Linear Regulator
ELECTRICAL CHARACTERISTICS
(Note 1)
TJ4940
Limits in standard typeface are for TJ=25ºC, and limits in
boldface type
apply over the
full operating temperature range.
Unless otherwise specified: V
IN(Note 2)
= V
O(NOM)
+ 1 V, I
L
= 10 mA, C
IN
= 10 uF, C
OUT
= 10 uF, V
EN
= V
IN
- 0.3 V
PARAMETER
Output Voltage Tolerance
Line Regulation
(Note 1)
Load Regulation
(Note 1, 2)
SYMBOL
V
O
ΔV
LINE
ΔV
LOAD
TEST CONDITION
V
OUT
+1 V < V
IN
< 5.5 V
V
OUT
+1 V < V
IN
< 5.5 V
10 mA < I
L
< 1 A
I
L
= 100 mA
Dropout Voltage
(Note 3)
V
DROP
I
L
= 1 A
I
L
= 100 mA
Ground Pin Current
(Note 4)
I
GND
I
L
= 1 A
Power Supply Rejection Ratio
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
PSRR
T
SD
ΔT
SD
f = 1kHz
-
-
-
-
-
0.40
55
165
10
-
-
400
0.40
MIN.
-2
-3
-
-
-
TYP.
0
0.15
0.20
45
MAX.
2
3
-
0.40
0.50
0.60
55
65
500
600
0.6
1.0
0.6
1.0
-
-
-
UNIT
%
%/V
%
mV
mA
dB
ºC
ºC
Note 1. Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage.
Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current.
Note 2. Regulation is measured at constant junction temperature by using a 10ms current pulse. Devices are tested for load regulation in the
load range from 10mA to 1A.
Note 3. Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value.
Dropout voltage specification applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the dropout voltage is
nothing but the input to output differential, since the minimum input voltage is 2.5V
Note 4. Ground current, or quiescent current, is the difference between input and output currents. It's defined by I
GND1
= I
IN
- I
OUT
under the
given loading condition. The total current drawn from the supply is the sum of the load current plus the ground pin current.
Jul. 2011 – Preliminary
5/8
HTC
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