LD2127 [UTC]
LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS;
| 型号： | LD2127 |
| 厂家： | 
Unisonic Technologies |
| 描述： | LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| 文件： | 总6页 (文件大小：210K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LD2127/A
Preliminary
LINEAR INTEGRATED CIRCUIT
LOW DROP FIXED AND
ADJUSTABLE POSITIVE
VOLTAGE REGULATORS
DESCRIPTION
1
The UTC LD2127/A is a low dropout, 3-terminal positive
SOT-223
voltage regulator designed to provide output current up to
800mA/1A, There are adjustable versions (VREF=1.0V) and
various fixed versions.
FEATURES
* Low dropout voltage
* Suitable for SCSI-2 active termination if VOUT set to 2.85V
* Output current up to 0.8A for 2127 and 1.0A for 2127A
* Built-in current limit and over temperature protection
* Ultra low Adjustment Current (7μA typ.)
* Ultra low minimum Load (0.3mA typ.)
* Stable with low ESR ceramic output capacitor (MLCC)
ORDERING INFORMATION
Ordering Number
Pin Assignment
A: AOI
Package
SOT-223
Packing
Lead Free
Halogen Free
B: OAI
C: AIO
LD2127L-xx-AA3--R
LD2127G-xx-AA3--R
Tape Reel
D: IAO
Note: Pin Assignment: I: VIN O: VOUT
A: ADJ
LD2127 1 L-xx-AA3- 2 - R
(1) R: Tape Reel
(1)Packing Type
(2)Pin Assignment
(3)Package Type
(4)Output Voltage Code
(5)Lead Free
(2) refer to Pin Assignment
(3) AA3: SOT-223
(4) xx: refer to Marking Information
(5) L: Lead Free, G: Halogen Free
(6) Blank: 800mA, A: 1A
(6)Current Code
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LD2127/A
Preliminary
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
L: Lead Free
G: Halogen Free
Pin Code
Current Code
Voltage Code
LD2127
XX
SOT-223
AD :ADJ
Date Code
1
2
3
BLOCK DIAGRAM
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LD2127/A
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (TA=25°C)
PARAMETER SYMBOL
RATINGS
18
UNIT
V
DC Input Voltage
VIN
PD
Power Dissipation
Internally limited
+150
W
Junction Temperature
Storage temperature
TJ
°C
TSTG
-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.
RECOMMENDED OPERATING RATINGS
PARAMETER
SYMBOL
RATINGS
15
UNIT
V
Input Voltage
VIN
TJ
Operating Junction Temperature
0 ~ +125
°C
THERMAL DATA
PARAMETER
SYMBOL
θJA
RATINGS
165
UNIT
°C/W
°C/W
Junction to Ambient
Junction to Case
θJC
15
ELECTRICAL CHARACTERISTICS
(TA=25°C, refer to the test circuits, TJ=0 ~ 125°C, CO=10μF unless otherwise specified)
For LD2127/A-ADJ
PARAMETER
Reference Voltage
SYMBOL
TEST CONDITIONS
MIN
0.98
TYP
1.0
MAX
1.02
UNIT
VREF VIN-VOUT=2V, IOUT=10mA, TJ=25°C
V
VIN-VOUT=1.4~10V
VREF
Reference Voltage
Line Regulation
0.98
1.0
0.5
1.02
V
LD2127A : IOUT=10~1000mA
∆VOUT VIN-VOUT=1.5 ~ 13.75V, IOUT=10mA
VIN-VOUT=3V
%
Load Regulation
∆VOUT LD2127 : IOUT=10~800mA
LD2127A : IOUT=10~1000mA
∆VOUT
2.0
%
Temperature stability
Long Term Stability
0.50
0.3
%
%
V
∆VOUT 1000 hrs, TJ=125°C
VIN
Operating Input Voltage
Adjustment Pin Current
15
10
IADJ
VIN15V
7
μA
VIN-VOUT=1.4~10V,
LD2127A : IOUT=10 ~ 1000mA
Adjustment Pin Current Change
Minimum Load Current
Current Limit
∆IADJ
0.3
0.3
2
1
μA
mA
mA
%
IO(MIN) VIN=15V
800
LD2127
ILIMIT VIN-VOUT=5V, TJ=25°C
1000
LD2127A
Output Noise (%VO)
eN
B=10Hz ~ 10KHz, TJ=25°C
0.003
IOUT=40mA, f=120Hz, TJ=25°C,
VIN-VOUT=3V, VRIPPLE=1VPP
Supply Voltage Rejection
SVR
75
dB
I
OUT=100mA
1.05
1.15
1.18
1.22
0.01
150
1.15
1.25
1.28
1.35
0.10
IOUT=500mA
Dropout Voltage
VD
V
IOUT=800mA
IOUT=1A
Thermal Regulation
Thermal Shutdown
TA=25°C, 30ms Pulse
%/W
°C
OTP
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LD2127/A
Preliminary
LINEAR INTEGRATED CIRCUIT
APPLICATION NOTE of LD2127/A ADJUSTABLE
The LD2127/A adjustable has a reference voltage of between the OUT and ADJ pins. IADJ is 7μA typ. (10μA
max.) and IADJ is 0.3μA typ. (2µA max.).
R1 is normally fixed to 1.2kΩ.
From figure 1 we obtain:
VOUT=VREF+R2(IADJ+IR1)=VREF + R2(IADJ+VREF/R1)=VREF(1+R2/R1) + R2 × IADJ.
Usually R2 value is in the range of few KΩ, so the R2 X IADJ product could be neglected; then the above
expression becomes: VOUT=VREF(1+R2/R1)
For better load regulation, realize a good Kelvin connection of R1 and R2 is important. Particularly R1 connection
must be realized very close to OUT and ADJ pin, while R2 ground connection must be placed as near as possible to
the negative Load pin. Ripple rejection can be improved by introducing a 10μF electrolytic capacitor placed in
parallel to the R2 resistor (See Fig. 2)
The UTC LD2127/A also supports MLCC. See Fig.3 for adjustable output.
UTC LD2127/A
VIN
VOUT
IN
OUT
+
+
ADJ
10µF
10µF
R1
1.2kΩ
VREF
R2
Fig.1 Adjustable Output Voltage Application Circuit
Fig.2 Adjustable Output Voltage Application with improved Ripple Rejection.
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LD2127/A
Preliminary
LINEAR INTEGRATED CIRCUIT
APPLICATION NOTE of LD2127/A ADJUSTABLE(Cont.)
UTC LD2127/A
IN
VIN
VOUT
OUT
ADJ
10µF
10µF
R1
1.2kΩ
VREF
R2
Fig.3 Adjustable Output Voltage Application Circuit for MLCC
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LD2127/A
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
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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