LR2125-AD-AF5-R [UTC]
Regulator;型号: | LR2125-AD-AF5-R |
厂家: | Unisonic Technologies |
描述: | Regulator |
文件: | 总8页 (文件大小:329K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LR2125
LINEAR INTEGRATED CIRCUIT
300mA SELECTABLE
FIXED/ADJUSTABLE LOW
DROPOUT LINEAR REGULATOR
DESCRIPTION
As a low dropout linear regulator, the UTC LR2125 only needs
low input voltage (2.8~6V), and can deliver current to 300mA for
setting the output voltage.
The UTC LR2125 is an ideal for being used in such
battery-powered equipments notebook, personal computer and
cellular phone. Its typical dropout voltage is 230mV at loading current
300mA.
For setting the output voltage, the UTC LR2125 has two output
voltage operation modes: fixed mode senses the output voltage on
VOUT, adj mode needs two resistors as a voltage divider.
Lead-free:
LR2125L-xx
To protect itself against current over-loads and over temperature,
Halogen-free: LR2125G-xx
the LR2125 has current limit and thermal shutdown functions.
FEATURES
* Operating Voltage: 2.8~6V
* Low Voltage Dropout
* Output Current Guaranteed 300mA
* For Setting Output Voltage Two Modes
– Fixed mode :Fixed Output Voltage 1~5V
– ADJ mode: Adjustable Output Voltage 0.8~5.5V
* Internal Current Limit Protection
* With Soft-Start
* Internal thermal Protection
* Work stably with Low ESR Ceramics Capacitor
ORDERING INFORMATION
Ordering Number
Package
SOT-25
Packing
Normal
Lead Free Plating
LR2125L-xx-AF5-R
Halogen Free
LR2125G-xx-AF5-R
LR2125-xx-AF5-R
Tape Reel
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LR2125
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
12 :1.2V
MARKING
3
2
1
5
18 :1.8V
SEXX
SOT-25
L: Lead Free
L: Halogen Free
Voltage Code
25 :2.5V
AD :ADJ
4
PIN CONFIGURATION
VIN
GND
2
SHDN
1
3
4
5
VOUT
SET
PIN DESCRIPTION
PIN NO
PIN NAME
SHDN
DESCRIPTION
Control pin for shutdown
1
logic high: enable ;
logic low: shutdown
Ground
2
3
4
GND
VIN
Voltage supply
Output pin
VOUT
When this pin is connected to ground, turns to fixed output voltage operation.
When this pin is connected to an external resistor divider, turns to adjustable
output voltage mode operation.
5
SET
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LR2125
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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LR2125
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VIN
RATINGS
-0.3 ~ +6.5
UNIT
V
VIN Supply Voltage (VIN to GND)
SHDN Input Voltage ( SHDN to GND)
VSHDN
-0.3 ~ +6.5
V
Power Dissipation
PD
TJ
Internally Limited
-40~ +125
W
°С
°С
Junction Temperature
Storage Temperature
TSTG
-65 ~ +150
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.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
RATINGS
2.8 ~ 6
UNIT
V
VIN Supply Voltage
Output Voltage
VIN
VOUT
IOUT
CIN
0.8 ~ 5.5
0 ~ 300
V
VOUT Output Current
Input Capacitor
mA
μF
μF
°С
0.22 ~ 100
1.5 ~ 33
Output Capacitor
Junction Temperature
COUT
TOPR
-40 ~ +125
ELECTRICAL CHARACTERISTICS
(VIN = VOUT+1V (min VIN=2.8V), IOUT=0~300mA, CIN = 1μF, COUT = 2.2μF, Ta = 25°С, Unless otherwise specified)
PARAMETER
Output Voltage
SYMBOL
VOUT
TEST CONDITIONS
MIN TYP MAX UNIT
0.8
2.8
5.5
6
V
V
Input Voltage
VIN
ΔV
OUT
△VOUT%/△VIN, IOUT=10mA
△VOUT%/△IOUT
Line Regulation
-0.06
+0.06 %/V
+0.2 %/A
ΔV × V
IN OUT
ΔVOUT
Load Regulation
-0.2
-2
ΔIOUT × VOUT
Output Voltage Accuracy
Fixed output voltage, IOUT=10mA
Measured on SET, VIN=2.8V,
+2
%
V
Reference Voltage
Quiescent Current
Dropout Voltage
VREF
IQ
0.784 0.8 0.816
I
OUT=10mA
IOUT =10mA ~300mA
135
230
170
45
160
360
300
μA
mV
mV
dB
VOUT = 2.5V, IOUT = 300mA
VOUT = 3.3V, IOUT = 300mA
VD
Power Supply Ripple Rejection Ratio
Output Voltage Noise
PSRR f = 10kHz, IOUT = 300mA
eN
ILIMIT
VIH
f = 80Hz ~ 100KHz, IOUT = 300mA
160
600
μVRMS
mA
V
Current Limit
450
1.6
Shutdown Threshold
VIL
0.4
1
V
Shutdown Supply Current
IOFF
0.1
60
μA
SHDN = Low, VIN = 6V
SHDN = Low
VOUT Discharge MOSFET RDS(ON)
Ω
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
SET Input Threshold for
Fixed/Adjustable Output Voltage Mode
SET Input Bias Current
TSHDN
160
40
°С
°С
DTSHDN
100
mV
-100
100
nA
Soft-Start Interval
TSS
60
μs
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LR2125
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
Input Capacitor
Value:
Larger than 1µF, at least a 1µF ceramic capacitor
Place:
Be placed near the VIN very closely
Purpose and Advantage Description:
To prevent the input rail from dropping, this capacitor can provide surge current as while as the circuit’s stepping
load transients.
Output Capacitor
Value:
Larger than 2.2µF
Place:
Be placed at the load and near the GND pin very closely.
Purpose and Advantage Description:
Mainly make sure the circuit’s operating stability. And the large value capacitor also can reduce noise and improve
transient response. Additionally, it can affect power on issue.
0.1155
COUT(max) = 0.87×(0.55 -
)
VOUT
Maximum Output Capacitor’s Value (µF) and the Output Voltage (V)’s Value’s Relationship
Maximum Output Capacitor’s Changing Over VOUT
.
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LR2125
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUITS
For Fixed Output Voltage Mode
For Adjustable Output Voltage Mode
R1
VOUT = 0.8×(1+
)
R2
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LR2125
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Quiescent Current vs. Output Current
Output Voltage vs. Input Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0
180
160
140
120
100
80
IOUT=0mA
IOUT=300mA
VIN=5.5V
VIN=4.5V
60
0
1
2
3
4
5
6
0
50
100 150 200 250 300
Input Voltage,VIN (V)
Output Current, IOUT(mA)
Dropout Voltage vs. Output Current
Quiescent Current vs. Input Voltage
300
250
200
150
100
50
250
200
150
100
50
IOUT=300mA
IOUT=0mA
0
0
0
50
100 150 200 250 300
Output Current,IOUT(mA)
1
2
3
4
5
6
Input Voltage,VIN(V)
Line Transient
Load Transient
CIN=1µF,COUT=2.2µF,
VIN=3.0V,CIN=1µF,COUT=2.2µF
VOUT
VIN
IOUT
VOUT
CH1:VI N ,1V/div,DC
CH2:VO U T ,20mV/div,AC
Time:100µs/div
CH2:VO U T ,50mV/div,AC
CH3:IO U T ,200mA/div,DC
Time:100µs/div
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LR2125
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
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.
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LR2125L-AD-AF5-R
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