LDS3985PU28R [STMICROELECTRONICS]
Ultra low drop-low noise BiCMOS 300 mA voltage regulator for use with very low ESR output capacitor; 超低压降，低噪音的BiCMOS 300毫安电压调节器的使用非常低的ESR输出电容器
| 型号： | LDS3985PU28R |
| 厂家： | 
ST |
| 描述： | Ultra low drop-low noise BiCMOS 300 mA voltage regulator for use with very low ESR output capacitor |
| 文件： | 总20页 (文件大小：459K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LDS3985xx
Ultra low drop-low noise BiCMOS 300 mA voltage
regulator for use with very low ESR output capacitor
Features
■ Input voltage from 2.5 V to 6 V
■ Stable with low ESR ceramic capacitors
■ Ultra low dropout voltage (150 mV typ. at 300
mA load, 0.4 mV typ. at 1 mA load)
■ Very low quiescent current (85 µA typ. at no
load, 200 µA typ. at 300 mA load; max 1.5 µA
in off mode)
DFN6
SOT23-5L
■ Guaranteed output current up to 300 mA
■ Wide range of output voltage:
– from 1.25 V to 5.0 V
■ Fast turn-on time: typ. 240 µs
makes it suitable for low power applications and in
battery powered systems. Regulator ground
current increases only slightly in dropout, further
prolonging the battery life. Shutdown logic control
function is available, this means that when the
device is used as local regulator, it is possible to
put a part of the board in standby, decreasing the
total power consumption. Typical applications are
in mobile phone and similar battery powered
wireless systems, portable information
– [C = 2.2 µF, C
= 33 nF and I = 1 mA]
O
O
BYP
■ Logic-controlled electronic shutdown
■ Internal current and thermal limit
■ Output low noise voltage 30 µV
over 10 Hz
RMS
to 100 kHz
■ SVR of 55 dB at 1 kHz, 50 dB at 10 kHz
■ Temperature range: - 40 °C to 125 °C
appliances.
Description
The LDS3985xx provides up to 300 mA, from 2.5
V to 6 V input voltage. It is stable with ceramic and
high quality tantalum capacitor. The ultra low drop
voltage, low quiescent current and low noise
Table 1.
Device summary
Part numbers
Output voltages
LDS3985XX15
LDS3985XX18
LDS3985XX25
LDS3985XX28
LDS3985XX30
LDS3985XX33
LDS3985XX50
1.5 V
1.8 V
2.5 V
2.8 V
3.0 V
3.3 V
5.0 V
July 2010
Doc ID 11039 Rev 7
1/20
www.st.com
20
Contents
LDS3985xx
Contents
1
2
3
4
5
6
7
8
9
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
Doc ID 11039 Rev 7
LDS3985xx
1
Diagram
Diagram
Figure 1.
Schematic diagram
Doc ID 11039 Rev 7
3/20
Pin configuration
LDS3985xx
2
Pin configuration
Figure 2.
Pin connections (top view for SOT23-5L, top through view for DFN6)
SOT23-5L
DFN6
Table 2.
Pin description
Pin n° for
Pin n° for
SOT23-5L
Symbol
Name and function
DFN6
1
2
1
5
VI
Input voltage of the LDO
Common ground
GND
Inhibit input voltage: on mode when VINH ≥ 1.2 V, off mode when VINH
0.4 V (Do not leave floating, not internally pulled down/up)
≤
3
4
6
4
VINH
Bypass pin: connect an external capacitor (usually 10 nF) to minimize
noise voltage
BYPASS
5
-
3
2
VO
Output voltage of the LDO
Not connect
N.C.
4/20
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LDS3985xx
3
Typical application
Typical application
Figure 3.
Typical application circuit
Doc ID 11039 Rev 7
5/20
Maximum ratings
LDS3985xx
4
Maximum ratings
Table 3.
Absolute maximum ratings
Parameter
Symbol
Value
Unit
VI
DC input voltage
-0.3 to 6 (1)
-0.3 to VI+0.3
-0.3 to VI+0.3
Internally limited
Internally limited
-65 to 150
V
V
V
VO
DC output voltage
VINH
IO
INHIBIT input voltage
Output current
PD
Power dissipation
TSTG
TOP
Storage temperature range
Operating junction temperature range
°C
°C
-40 to 125
1. The input pin is able to withstand non repetitive spike of 6.5 V for 200 ms.
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 4.
Symbol
Thermal data
Parameter
SOT23-5L
DFN6
Unit
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
81
10
55
°C/W
°C/W
255
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LDS3985xx
Electrical characteristics
5
Electrical characteristics
T = 25 °C, V = V
+ 0.5 V, C = 1 µF, C = 2.2 µF, C
= 33 nF, I = 1 mA,
BYP O
J
I
O(NOM)
I
O
V
= 1.4 V, unless otherwise specified.
INH
Table 5.
Symbol
Electrical characteristics for LDS3985xx
Parameter Test conditions
Min.
Typ.
Max.
Unit
VI
Operating input voltage
Output voltage < 2.5 V
2.5
-50
-75
-2
6
50
75
2
V
I
O = 1 mA
TJ = - 40 to 125 °C
O = 1 mA
VO
mV
I
% of
VO(NOM)
VO
Output voltage ≥ 2.5 V
TJ= - 40 to 125 °C
-3
3
VI = VO(NOM) + 0.5 to 6 V,
TJ = - 40 to 125 °C
-0.1
0.1
ΔVO
Line regulation (1)
%/V
VO = 4.7 to 5 V
-0.19
0.19
0.01
IO = 1 mA to 300 mA, VO ≤ 2.5 V
TJ = - 40 to 125 °C
ΔVO
ΔVO
ΔVO
Load regulation
Load regulation
0.005
%/mA
I
O = 1 mA to 300 mA, VO ≥ 2.5 V
0.0008 0.004 %/mA
TJ = - 40 to 125 °C
Output AC line regulation VI = VO(NOM) + 1 V, IO = 300 mA,
5
mVPP
(2)
tR = tF = 30 µs
IO = 0
85
IO = 0, TJ = - 40 to 125 °C
150
300
1.5
2
Quiescent current
ON MODE: VINH = 1.24 V
IO = 0 to 300 mA
200
0.003
0.4
IQ
µA
IO = 0 to 300 mA, TJ = - 40 to 125 °C
OFF MODE: VINH = 0.4 V
TJ = - 40 to 125 °C
IO = 1 mA
IO = 1 mA, TJ = -40 to 125 °C
I
O = 150 mA
60
VDROP Dropout voltage (3)
mV
IO = 150 mA, TJ = - 40 to 125 °C
IO = 300 mA
100
250
150
IO = 300 mA, TJ = - 40 to 125 °C
ISC
Short circuit current
RL = 0
600
55
mA
dB
VI = VO(NOM)+0.25 V
VRIPPLE = 0.1 V, IO = 50 mA
For VO(NOM) < 2.5 V,
VI = 2.55 V
f = 1 kHz
SVR Supply voltage rejection
IO(PK) Peak output current
f = 10 kHz
50
VO ≥ VO(NOM) - 5 %
300
550
mA
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Electrical characteristics
LDS3985xx
Table 5.
Symbol
Electrical characteristics for LDS3985xx (continued)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Inhibit input logic Low
Inhibit input logic High
Inhibit input current
Output noise voltage
Turn On time (4)
0.4
VINH
VI = 2.5 V to 6 V, TJ= - 40 to 125 °C
V
1.4
IINH
eN
VINH = 0.4 V, VI = 6 V
1
30
nA
µVRMS
µs
BW = 10 Hz to 100 kHz, CO = 2.2 µF
tON
CBYP = 33 nF
240
160
(5)
TSHDN Thermal shutdown
°C
Capacitance
ESR
2.2
5
22
µF
CO Output capacitor
5000
mΩ
1. For VO(NOM) < 2 V, VI = 2.5 V
2. For VO(NOM) = 1.25 V, VI = 2.5 V
3. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply for input voltages below 2.5 V
4. Turn-on time is time measured between the enable input just exceeding VINH high value and the output voltage just
reaching 95 % of its nominal value
5. Typical thermal protection hysteresis is 20 °C
8/20
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LDS3985xx
Typical performance characteristics
6
Typical performance characteristics
T = 25 °C, V = V
+ 0.5 V, C = 1 µF, C = 2.2 µF, C
= 33 nF, I = 1 mA,
BYP O
J
I
O(NOM)
I
O
V
= 1.4 V, unless otherwise specified.
INH
Figure 4.
Output voltage vs. temp. (V = 2.5 V) Figure 5.
Output voltage vs. temp. (V = 3.2 V)
I
I
Figure 6.
Output voltage vs. temp. (V = 3.8 V) Figure 7.
Shutdown voltage vs. temperature
I
(V = 1.35 V)
O
Figure 8.
Shutdown voltage vs. temperature Figure 9.
Line regulation vs. temperature
(V = 3.3 V)
(V = 2.5 V to 6 V)
O
I
Doc ID 11039 Rev 7
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Typical performance characteristics
LDS3985xx
Figure 10. Line regulation vs. temperature
Figure 11. Line regulation vs. temperature
(V = 3.8 V to 6 V)
(V = 3.2 V to 6 V)
I
I
Figure 12. Quiescent current vs. temperature Figure 13. Quiescent current vs. temperature
(V = 2.5 V) (V = 6 V)
I
I
Figure 14. Quiescent current vs. temperature Figure 15. Supply voltage rejection vs.
(V = 3.4 V) frequency
I
10/20
Doc ID 11039 Rev 7
LDS3985xx
Typical performance characteristics
Figure 16. Dropout voltage vs. temperature
Figure 17. Dropout voltage vs. output current
Figure 18. Inhibit transient
VI = 5 V, IO = 1 mA, VINH = 0 to 1.2 V, CI = CO = 1 µF (cer),
CBYP = 10 nF, TR = TF = 1 µs
Doc ID 11039 Rev 7
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Package mechanical data
LDS3985xx
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
12/20
Doc ID 11039 Rev 7
LDS3985xx
Package mechanical data
SOT23-5L mechanical data
mm.
mils.
Dim.
Min.
0.90
0.00
0.90
0.35
0.09
2.80
1.50
Typ.
Max.
1.45
0.10
1.30
0.50
0.20
3.00
1.75
Min.
35.4
0.0
Typ.
Max.
57.1
3.9
A
A1
A2
b
35.4
13.7
3.5
51.2
19.7
7.8
C
D
E
110.2
59.0
118.1
68.8
e
0.95
37.4
H
L
2.60
0.10
3.00
102.3
3.9
118.1
23.6
0.60
7049676D
Doc ID 11039 Rev 7
13/20
Package mechanical data
LDS3985xx
DFN6 (3x3 mm) mechanical data
mm.
inch.
Typ.
Dim.
Min.
Typ.
0.90
0.02
0.20
0.30
3.00
2.38
3.00
1.65
0.95
0.40
Max.
1.00
0.05
Min.
0.031
0
Max.
0.039
0.002
A
A1
A3
b
0.80
0.035
0
0.001
0.008
0.012
0.118
0.094
0.118
0.065
0.037
0.016
0.23
2.90
2.23
2.90
1.50
0.38
3.10
2.48
3.10
1.75
0.009
0.114
0.088
0.114
0.059
0.015
0.122
0.098
0.122
0.069
D
D2
E
E2
e
L
0.30
0.50
0.012
0.020
7946637A
14/20
Doc ID 11039 Rev 7
LDS3985xx
Package mechanical data
DFN6D (3x3 mm) mechanical data
mm.
inch.
Dim.
Min.
0.80
0
Typ.
Max.
1.00
0.05
Min.
0.031
0
Typ.
Max.
0.039
0.002
A
A1
A3
b
0.02
0.20
0.001
0.008
0.23
2.90
2.23
2.90
1.50
0.45
3.10
2.50
3.10
1.75
0.009
0.114
0.088
0.114
0.059
0.018
0.122
0.098
0.122
0.069
D
3.00
3.00
0.118
0.118
D2
E
E2
e
0.95
0.037
L
0.30
0.40
0.50
0.012
0.016
0.020
7946637B
Doc ID 11039 Rev 7
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Package mechanical data
LDS3985xx
Tape & reel SOT23-xL mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
180
Min.
Max.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
3.33
3.27
1.47
4.1
0.567
0.131
0.128
0.0.58
0.161
0.161
Ao
Bo
Ko
Po
P
3.13
3.07
1.27
3.9
3.23
3.17
1.37
4.0
0.123
0.120
0.050
0.153
0.153
0.127
0.124
0.054
0.157
0.157
3.9
4.0
4.1
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Doc ID 11039 Rev 7
LDS3985xx
Package mechanical data
Tape & reel QFNxx/DFNxx (3x3) mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
180
Min.
Max.
7.087
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
14.4
0.567
Ao
Bo
Ko
Po
P
3.3
3.3
1.1
4
0.130
0.130
0.043
0.157
0.315
8
Doc ID 11039 Rev 7
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Order codes
8
LDS3985xx
Order codes
Table 6.
Order codes
Packages
DFN6
Output voltage
SOT23-5L
DFN6D
LDS3985M125R (1)
LDS3985M135R (1)
LDS3985M15R
LDS3985PM12R (1)
LDS3985PM13R (1)
LDS3985PM15R (1)
LDS3985PM18R (1)
LDS3985PM20R (1)
LDS3985PM21R (1)
LDS3985PM22R (1)
LDS3985PM25R (1)
LDS3985PM26R (1)
LDS3985PM27R (1)
1.25 V
1.35 V
1.5 V
1.8 V
2.0 V
2.1 V
2.2 V
2.5 V
2.6 V
2.7 V
2.8 V
2.85 V
2.9 V
3.0 V
3.3 V
4.7 V
4.8 V
4.9 V
5.0 V
LDS3985PU15R
LDS3985M18R
LDS3985M20R (1)
LDS3985M21R (1)
LDS3985M22R (1)
LDS3985M25R
LDS3985M26R (1)
LDS3985M27R (1)
LDS3985M28R
LDS3985PU28R
LDS3985PU33R
LDS3985M285R (1)
LDS3985M29R (1)
LDS3985M30R
LDS3985PM285R (1)
LDS3985PM29R (1)
LDS3985PM30R (1)
LDS3985M33R
LDS3985M47R (1)
LDS3985M48R (1)
LDS3985M49R (1)
LDS3985M50R
LDS3985PM47R (1)
LDS3985PM48R (1)
LDS3985PM49R (1)
LDS3985PM50R (1)
1. Available on request.
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LDS3985xx
Revision history
9
Revision history
Table 7.
Date
Document revision history
Revision
Changes
02-Dec-2004
10-Apr-2007
16-May-2007
06-Sep-2007
11-Jun-2008
11-Jul-2009
29-Jul-2010
1
2
3
4
5
6
7
First release.
Added: new package TSOT23-5L.
Added: new mechanical data DFN6D and order codes updated.
Added: Table 1 in cover page.
Modified: Table 6 on page 18.
Modified: Table 6 on page 18.
Modified: Table 1 on page 1 and Table 6 on page 18.
Doc ID 11039 Rev 7
19/20
LDS3985xx
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Doc ID 11039 Rev 7
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