LD3985XX [STMICROELECTRONICS]
Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible; 超低压降低噪声BICMOS稳压器低ESR电容兼容
| 型号： | LD3985XX |
| 厂家： | 
ST |
| 描述： | Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible |
| 文件： | 总22页 (文件大小：553K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LD3985xx
Ultra low drop-low noise BiCMOS voltage
regulators low ESR capacitors compatible
Features
■ Input voltage from 2.5 V to 6 V
■ Stable with low ESR ceramic capacitors
■ Ultra low dropout voltage (100 mV typ. at 150
mA load, 0.4 mV typ. at 1 mA load)
■ Very low quiescent current (85 µA typ. at no
load, 170 µA typ. at 150 mA load; max 1.5 µA
in OFF mode)
Flip-chip
(1.57x1.22)
SOT23-5L
TSOT23-5L
■ Guaranteed output current up to 150 mA
■ Wide range of output voltage: 1.22 V; 1.8 V;
2.5 V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V;
4.7 V
The ultra low drop-voltage, low quiescent current
and low noise make it suitable for low power
applications and in battery powered systems.
Regulator ground current increases only slightly
in dropout, further prolonging the battery life.
Power supply rejection is better than 60 dB at low
frequencies and starts to roll off at 10 kHz. High
power supply rejection is maintained down to low
input voltage levels common to battery operated
circuits. 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. The LD3985xx is designed to work
with low ESR ceramic capacitors. Typical
■ Fast turn-on time: typ. 200 µs
[C = 1 µF, C
= 10 nF and I = 1 mA]
O
BYP
O
■ Logic-controlled electronic shutdown
■ Internal current and thermal limit
■ Output low noise voltage 30 µV
over 10 Hz
RMS
to 100 kHz
■ S.V.R. of 60 dB at 1 kHz, 50 dB at 10 kHz
■ Temperature range: -40 °C to 125 °C
Description
applications are in mobile phone and similar
battery powered wireless systems.
The LD3985xx provides up to 150 mA, from 2.5 V
to 6 V input voltage.
Table 1.
Device summary
Part number
LD3985XX122
LD3985XX18
LD3985XX25
LD3985XX26
LD3985XX27
LD3985XX28
LD3985XX29
LD3985XX30
LD3985XX33
LD3985XX47
December 2007
Rev 12
1/22
www.st.com
22
LD3985xx
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
LD3985xx
1
Diagram
Diagram
Figure 1.
Schematic diagram
3/22
Pin configuration
LD3985xx
2
Pin configuration
Figure 2.
Pin connections (top view for SOT and TSOT, top through view for Flip-chip)
SOT23-5L/TSOT23-5L
Pin description
Flip-chip
Table 2.
Pin n° for
SOT23-5L/
TSOT23-5L
Pin n° for
Symbol
Name and function
Flip-chip
1
2
4
2
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
1
VINH
Bypass pin: connect an external capacitor (usually 10 nF) to minimize
noise voltage
4
5
5
3
BYPASS
VO
Output voltage of the LDO
4/22
LD3985xx
3
Typical application
Typical application
Figure 3.
Typical application circuit
5/22
Maximum ratings
LD3985xx
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
SOT23-5L/
TSOT23
Parameter
Flip-chip
Unit
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
81
°C/W
°C/W
255
170
6/22
LD3985xx
Electrical characteristics
5
Electrical characteristics
Table 5.
Electrical characteristics for LD3985 (T = 25 °C, V = V
+0.5 V, C = 1 µF, C
=
J
I
O(NOM)
I
BYP
10 nF, I = 1 mA, V
= 1.4 V, unless otherwise specified)
O
INH
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VI
Operating input voltage
Output voltage < 2.5V
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 ≥ 2.5V
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
ΔVO
Line regulation (Note: 1)
%/V
VO = 4.7 to 5V
-0.19
0.19
IO = 1 mA to 150mA, VO < 2.5V
Load regulation
0.002 0.008 %/mA
TJ= -40 to 125°C
I
O = 1 mA to 150mA, VO ≥ 2.5V
0.0004 0.002
%/mA
TJ= -40 to 125°C (for flip-chip)
ΔVO
ΔVO
Load regulation
IO = 1 mA to 150mA, TJ= -40 to 125°C
(for SOT23-5L/TSOT23-5L), VO ≥ 2.5V
0.0025 0.005
VI = VO(NOM) + 1 V, IO = 150mA,
tR= tF = 30µs
Output AC Line regulation
1.5
85
mVPP
IO = 0
IO = 0, TJ= -40 to 125°C
IO = 0 to 150mA
150
250
1.5
2
Quiescent current
ON MODE: VINH = 1.2V
170
0.003
0.4
IQ
µA
IO = 0 to 150mA, TJ= -40 to 125°C
OFF MODE: VINH = 0.4V
TJ= -40 to 125°C
IO = 1mA
I
O = 1mA, TJ= -40 to 125°C
IO = 50mA
O = 50mA, TJ= -40 to 125°C
20
I
35
VDROP Dropout voltage (Note: 1)
mV
IO = 100mA
45
IO = 100mA, TJ= -40 to 125°C
70
IO = 150mA
60
IO = 150mA, TJ= -40 to 125°C
RL = 0
100
ISC
Short circuit current
600
60
mA
dB
VI = VO(NOM)+0.25V
VRIPPLE = 0.1V, IO= 50mA
f = 1kHz
SVR Supply voltage rejection
f = 10kHz
50
VO(NOM) < 2.5V, VI = 2.55V
7/22
Electrical characteristics
LD3985xx
+0.5 V, C = 1
Table 5.
Symbol
Electrical characteristics for LD3985 (continued) (T = 25 °C, V = V
J I O(NOM)
I
µF, C
= 10 nF, I = 1 mA, V
= 1.4 V, unless otherwise specified)
BYP
O
INH
Parameter
Test conditions
Min.
Typ.
Max.
Unit
IO(PK) Peak output current
VO ≥ VO(NOM) - 5%
300
550
mA
Inhibit input logic low
VINH
0.4
VI = 2.5V to 6V, TJ= -40 to 125°C
V
Inhibit input logic high
1.2
IINH
eN
Inhibit input current
Output noise voltage
Turn On time (Note 4)
VINH = 0.4V, VI = 6V
BW = 10 Hz to 100 kHz, CO = 1µF
CBYP = 10 nF
1
30
nA
µVRMS
µs
tON
100
160
250
TSHDN Thermal shutdown
Note 5
°C
Capacitance (Note 6)
ESR
1
5
22
µF
CO
Output capacitor
5000
mΩ
Note:
1
2
3
For V
For V
< 2 V, V = 2.5 V
I
O(NOM)
= 1.25 V, V = 2.5 V
O(NOM)
I
Dropout voltage is the input-to-output voltage difference at which the output voltage is
100mV below its nominal value. This specification does not apply for input voltages below
2.5V.
4
Turn-on time is time measured between the enable input just exceeding V
High Value
INH
and the output voltage just reaching 95% of its nominal value
5
6
Typical thermal protection hysteresis is 20 °C
The minimum capacitor value is 1 µF, anyway the LD3985 is still stable if the compensation
capacitor has a 30 % tolerance in all temperature range.
8/22
LD3985xx
Typical performance characteristics
6
Typical performance characteristics
(T = 25 °C, V = V
+0.5 V, C = C = 1 µF, C
= 10 nF, I = 1mA, V
= 1.4 V,
INH
J
I
O(NOM)
I
O
BYP
O
unless otherwise specified)
Figure 4.
Figure 6.
Figure 8.
Output voltage vs temperature
Figure 5.
Output voltage vs temperature
Shutdown voltage vs temperature
Line regulation vs temperature
Output voltage vs temperature
Figure 7.
Shutdown voltage vs temperature Figure 9.
9/22
Typical performance characteristics
LD3985xx
Figure 10. Line regulation vs temperature
Figure 11. Line regulation vs temperature
Figure 12. Load regulation vs temperature
Figure 13. Load regulation vs temperature
Figure 14. Load regulation vs temperature
Figure 15. Quiescent current vs temperature
10/22
LD3985xx
Typical performance characteristics
Figure 16. Quiescent current vs temperature Figure 17. Quiescent current vs temperature
Figure 18. Supply voltage rejection vs
frequency
Figure 19. Load transient response
VI = 3.2V, IO = 1 to 150mA, Rise-Fall time = 1µsec
Figure 20. Line transient response
Figure 21. Start-Up
VI = 3.8V to 4.4V, TJ = 25°C, IO = 150mA, CI = CO = 1µF
(X7R), CBYP = 10nF, Rise-Fall time = 1µsec, VO = 2.7V
VI = 3.3V, IO = 1mA, CI = CO = 1µF (cer), CBYP = 10nF,
Tr = 20ns, VO = 2.8V
11/22
Typical performance characteristics
Figure 22. Turn-Off
LD3985xx
VI = 3.3V, IO = 1mA, CI = CO = 1mF (cer), CBYP = 10nF,
Tf = 20ns, VO = 2.8V
12/22
LD3985xx
Package mechanical data
7
Package mechanical data
®
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
13/22
Package mechanical data
LD3985xx
SOT23-5L mechanical data
mm.
mils.
Dim.
Min.
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
0.90
0.00
0.90
0.35
0.09
2.80
1.50
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
14/22
LD3985xx
Package mechanical data
TSOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
Max.
1.1
0.1
Min.
Typ.
Max.
43.3
3.9
A
A1
A2
b
0
0.7
0.3
0.08
1.0
0.5
0.2
27.6
11.8
3.1
39.4
19.7
7.9
C
D
2.9
2.8
114.2
110.2
63.0
E
E1
e
1.6
0.95
1.9
37.4
e1
L
74.8
0.3
0.6
11.8
23.6
7282780B
15/22
Package mechanical data
LD3985xx
Flip-chip 5 mechanical data
mm.
mils.
Typ.
27.6
Dim.
Min.
Typ.
0.7
Max.
0.765
0.29
Min.
25.0
8.3
Max.
30.1
11.4
16.7
13.4
61.8
48.0
21.7
36.1
A
A1
A2
b
0.635
0.21
0.25
0.40
0.315
1.540
1.19
0.5
9.8
0.375
0.290
1.510
1.16
0.425
0.340
1.570
1.22
14.8
11.4
59.4
45.7
17.7
32.1
15.7
12.4
6.1
D
E
46.8
19.7
34.1
13.6
13.3
e
0.45
0.55
e1
f
0.816
0.866
0.345
0.337
0.916
f1
16/22
LD3985xx
Package mechanical data
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
180
Min.
Typ.
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
17/22
Package mechanical data
LD3985xx
Tape & reel Flip-chip 5 mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
178
Min.
Max.
6.926
0.519
A
C
12.8
20.2
49
13.2
0.504
0.795
1.929
D
N
50
51
1.969
2.008
0.488
0.067
0.054
0.034
0.161
0.161
T
12.4
1.70
1.37
0.86
4.1
Ao
Bo
Ko
Po
P
1.60
1.27
0.76
3.9
1.65
1.32
0.81
4
0.063
0.050
0.030
0.153
0.153
0.065
0.052
0.032
0.157
0.157
3.9
4
4.1
18/22
LD3985xx
Package mechanical data
Tape & reel TSOT23-5L 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
19/22
Order codes
8
LD3985xx
Order codes
Table 6.
Order codes
Packages
SOT23-5L
TSOT23-5L
Flip-chip
Output voltage
LD3985M122R
LD3985M18R
LD3985G122R (1)
LD3985G18R
LD3985G25R
LD3985G26R (1)
LD3985G27R
LD3985G28R
LD3985G29R
LD3985G30R
LD3985G33R
LD3985G47R
1.22 V
1.8 V
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.3 V
4.7 V
LD3985J18R
LD3985J25R
LD3985J26R
LD3985M25R
LD3985M26R (1)
LD3985M27R
LD3985M28R
LD3985J28R
LD3985J29R
LD3985M29R
LD3985M30R
LD3985M33R
LD3985J33R
LD3985M47R
1. Available on request.
20/22
LD3985xx
Revision history
9
Revision history
Table 7.
Date
Document revision history
Revision
Changes
07-May-2004
05-Oct-2004
6
7
Part number status changed on table 3.
tON values are changed on table 5.
Order codes changed - Table 3.
27-Oct-2004
17-Mar-2005
10-Apr-2007
08-Jun-2007
20-Dec-2007
8
9
Improved drawing quality for figures 19-20-21-22.
Order codes updated.
10
11
12
Order code change.
Modified: Table 1, Table 6, mechanical data for flip-chip.
21/22
LD3985xx
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22/22
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