UNISONIC TECHNOLOGIES CO., LTD
L11815A
1.5A CMOS LDO
DESCRIPTION
The UTC
L11815A
is a COMS linear regulator. One of it’s
feature is very low quiescent current typical as low as 45μA
and its dropout voltage is extremely low with 1.5A output
current.
The internal circuit includes thermal shutdown and current
fold-back mechanism to prevent device failure when the circuit
is operated in the bad conditions.
In application, the UTC
L11815A
needs a low noise,
regulated supply. For stable operation, the output capacitance
value should be 4.7μF or more.
The UTC
L11815A
is an ideal for battery applications,
such as instrumentations, portable electronics, wireless
devices, PC peripherals, and battery powered widgets. The
output voltage values are set during manufacturing and the
accuracy is tighten 1.5%.
Preliminary
CMOS IC
FEATURES
* Quiescent Current (45μA typ.)
* Very Low Dropout Voltage
* Guaranteed 1.5A output
* Accuracy :
±1.5%
* Over-Temperature ShutDown
* With Current Limiting
* Short Circuit Current Fold-Back
* Low Temperature Coefficient
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
L11815AL-xx-AA3-x-R
L11815AG-xx-AA3-x-R
L11815AL-xx-TN3-x-R
L11815AG-xx-TN3-x-R
L11815AL-xx-TQ2-x-R
L11815AG-xx-TQ2-x-R
Note: Pin Assignment: G:GND O:V
OUT
I:V
IN
xx: Output Voltage, refer to Marking Information.
Package
SOT-223
TO-252
TO-263
Pin Assignment
A: GOI
D: IGO
Packing
Tape Reel
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L11815A
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
Preliminary
CMOS IC
MARKING
SOT-223
15: 1.5V
19: 1.9V
25: 2.5V
28: 2.8V
TO-252
TO-263
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L11815A
BLOCK DIAGRAM
Preliminary
CMOS IC
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L11815A
PARAMETER
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
-0.3 ~ +8
V
Output Voltage
V
OUT
GND - 0.3 ~ V
IN
+ 0.3
V
Power Dissipation
P
D
Internally limited
Junction Temperature
T
J
150
°C
Operating Temperature
T
OPR
- 40 ~ +85
°C
Storage Temperature
T
STG
- 65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
Junction to Case
TO-252
TO-263
SOT-223
SYMBOL
θ
JA
RATINGS
103
62.5
140
UNIT
°C/W
ELECTRICAL CHARACTERISTICS
(
V
IN
= V
O(Nom)
+2V , Ta = 25°C,
unless otherwise specified.)
PARAMETER
Input Voltage
Output Voltage Accuracy
Line Regulation
Load Regulation
Output Current
Current Limit
Short Circuit Current
Quiescent Current
Ground Pin Current
Dropout Voltage
Over Temperature Shutdown
Over Temperature Hysteresis
Temperature Coefficient of
Output Voltage
Power Supply Rejection
Output Voltage Noise
Note: V
IN(MIN)
=V
OUT
+V
D
SYMBOL
V
IN
V
OUT
Δ
V
OUT
V
OUT
Δ
V
OUT
V
OUT
I
OUT
I
LIMIT
I
SC
I
Q
I
GND
V
D
OTS
OTH
T
C
V
O
PSRR
eN
f=100Hz
I
OUT
=100mA, C
O
=4.7µF f=1kHz
f=10kHz
f=10Hz ~ 100kHz, I
OUT
=10mA, Co=4.7µF
TEST CONDITIONS
I
O
=1mA
I
OUT
=1mA
V
IN
=V
OUT
+1~ V
OUT
+2
I
OUT
=1mA ~ 1500mA
MIN
Note
-1.5
-0.15
-0.1
-1
1500
1500
V
IN
= V
O(NOM)
+1V, V
OUT
<0.4V
I
OUT
=0mA
I
OUT
=1mA ~ 1500mA
I
OUT
=1.5A
V
O(NOM)
≤2.0V
V
OUT
=V
O(NOM)
-2.0%
V
O(NOM)
>2.0V
TYP
MAX
7
1.5
0.15
0.1
1
UNIT
V
%
%
%
%
mA
mA
mA
µA
µA
mV
mV
°C
°C
ppm/°C
dB
dB
dB
µVrms
V
OUT
<2.0V
V
OUT
≥2.0V
0.02
0.2
2000
750
45
45
70
1300
800
150
30
30
70
50
20
30
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L11815A
DETAILED DESCRIPATION
Preliminary
CMOS IC
The UTC
L11815A
of CMOS regulators insist of a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
The error amplifier, over-current shutdown, and thermal protection circuits provides data for P-channel pass
transistor. The error amplifier takes output voltage for a precision reference in the normal operation and the normal
operation is restored when the junction temperature drops below 120°C.Over-current and Thermal shutdown circuits
start to work when the junction temperature is higher than 150 °C, or the current exceeds 2.2A. The output voltage
stays low when the thermal shutdown is in active.
The UTC
L11815A
behaves like a current source when the load reaches 2.2A. But the current would fall back to
600mA to prevent excessive power loss when the load impedance value is below 0.3Ω.Normal operation is restored
when the load resistance value is higher than 0.75
Ω.
EXTERNAL CAPACITORS
The UTC
L11815A
has an output capacitor to ground of 4.7μF or more in the stable operation. Ceramic
capacitors can provide the lowest ESR with the best AC performance. Aluminum Electrolytic capacitors, in contrast,
have the highest ESR with poorest AC response. Unfortunately, large value ceramic capacitors are comparatively
expensive. So we can parallel a 0.1μF ceramic capacitor with a 10μF Aluminum Electrolytic. The result is low ESR,
high capacitance, and low overall cost.
A second capacitor is recommended between the input and ground to stabilize input voltage. To get an ideal
effect the value of the input capacitor should be at least 0.1μF.
All capacitors should be placed in close proximity to the pins. This can be achieved with a star connection.
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