UNISONIC TECHNOLOGIES CO., LTD
LR1120
Preliminary
CMOS IC
500mA, LOW DROPOUT, LOW
NOISE ULTRA-FAST WITH SOFT
START CMOS LDO REGULATOR
DESCRIPTION
UTC
LR1120,
a 500mA LDO regulator, has very high PSRR and
super low dropout voltage especially suitable for wireless and portable
applications.
In the field of hand-held wireless devices, board space and
battery life are the main concerns of designers and end-users.
Because of the low quiescent current and low ESR ceramic
capacitors, UTC
LR1120
can satisfy those concerns.
Furthermore, low current consumption in shutdown mode
(0.7μA), fast turn-on time (<70μs), high output accuracy, current
limiting protection, and high ripple rejection ratio are advantages of
UTC
LR1120.
FEATURES
* Operating Voltage Ranges : 2.2V to 5.5V
* Dropout : 250mV at 500mA
* When IC Shutdown: 5mA Discharge Current of V
OUT
* Extreme Low Noise for DSC Application
* Extreme Fast Response in Line/Load Transient
* Internal Current Limiting Protection
* Internal Thermal Shutdown Protection
* High PSRR
* Recommended 1μF Output Capacitor only for Stability
* With TTL Logic Controlled Shutdown Input
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LR1120L-xx-AF5-x-R
LR1120G-xx-AF5-x-R
Note: xx: Output Voltage, refer to Marking Information.
Package
SOT-25
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
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QW-R502-331.g
LR1120
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
18 :1.8V
25 :2.5V
28 :2.8V
30: 3.0V
31 :3.1V
33 :3.3V
40 :4.0V
Preliminary
CMOS IC
MARKING
5
4
Pin Code
G: Halogen Free
L: Lead Free
SOT-25
Voltage
Code
SXXH□□
1
2
3
PIN DESCRIPTION
A
1
2
3
4
5
-
PIN CODE
B
1
2
3
-
4
5
C
1
2
3
-
5
4
PIN
NAME
V
IN
GND
EN
SS
V
OUT
NC
DESCRIPTION
Supply voltage input.
Ground.
Input logic pin, active high for enabling the chip. When this pin goes to
a logic low, the chip will be shutdown.
Soft start pin.
Regulator output voltage pin.
No Connection
BLOCK DIAGRAM
SS
Current Limit
V
IN
V
REF
POR
OTP
-
+
MOS Driver
V
OUT
EN
R
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-331.g
LR1120
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
(T
A
= 25°C, unless otherwise specified.)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Input Voltage
V
IN
6
V
EN Input Voltage
V
EN
6
V
Power Dissipation (T
A
= 25°C)
P
D
0.4
W
Junction Temperature
T
J
150
°C
-65~
+150
Storage Temperature
T
STG
°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 Ambient
SYMBOL
θ
JA
RATINGS
250
UNIT
°C/W
OPERATING CONDITIONS
PARAMETER
SYMBOL
RATINGS
Supply Input Voltage
V
IN
2.2 ~ 5.5
Junction Temperature
T
J
-40 ~ +125
Ambient Temperature
T
A
-40 ~ +85
Note: The device is not guaranteed to function outside its operating conditions.
UNIT
V
°C
°C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
OUT
+ 0.5V, V
EN
= V
IN
, C
IN
= C
OUT
= 1μF (Ceramic), T
A
= 25°C, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Input Voltage
V
IN
2.2
5.5
V
Output Voltage Accuracy
ΔV
OUT
I
OUT
= 10mA
-2
0
+2
%
Δ
V
OUT
V
IN
= (V
OUT
+0.5V) ~ 5.5V, I
OUT
= 1mA
Line Regulation
0.01 0.2 %/V
Δ
V
IN
× V
OUT
Δ
V
OUT
1mA<I
OUT
<400mA, 2.2V≤V
IN
<2.7V
0.6
%
Load Regulation (Note 1)
V
OUT
1mA<I
OUT
<500mA, 2.7 V≤V
IN
≤5.5V
1
%
Quiescent Current (Note 2)
I
Q
V
EN
= 5V, I
OUT
= 0mA
25
50
μA
Standby Current
I
STN-BY
V
EN
= 0V
0.7
1.5
μA
R
LOAD
= 0Ω, 2.2V≤V
IN
<2.7V
0.4
0.7 1.05
A
Current Limit
I
LIMIT
R
LOAD
= 0Ω, 2.7V≤V
IN
≤5.5V
0.5
0.8 1.05
A
I
OUT
= 400mA, 2.2V≤V
IN
≤2.7V
160 320
Dropout Voltage (Note 3)
V
D
mV
I
OUT
= 500mA, 2.7V≤V
IN
≤5.5V
250 400
Soft Start Time
V
OUT
= 2.5V, C
SS
= 1nF, C
OUT
= 1μF
0.7
1
ms
0
0.6
V
Logic-Low
V
IL
EN Threshold
Logic-High
V
IH
1.6
5.5
V
Enable Pin Current
I
EN
0.1
1
5
μA
Over Temperature Shutdown
OTS
170
°C
Over Temperature Hysteresis
OTH
30
°C
Power Supply Rejection Rate
PSRR
I
OUT
= 10mA, f = 10kHz
55
dB
Output Noise Voltage
e
N
V
OUT
=1.5V,C
OUT
=1μF,I
OUT
=0mA, C
SS
= 1nF
40
μV
RMS
Note: 1. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested
for load regulation in the load range from 1mA to 500mA.
2. Quiescent, or ground current, is the difference between input and output currents. It is defined by I
Q
= I
IN
-
I
OUT
under no load condition (I
OUT
= 0mA). The total current drawn from the supply is the sum of the load
current plus the ground pin current.
3. The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
×98%.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 4
QW-R502-331.g
LR1120
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-331.g
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