STMICROELECTRONICS LD3985M18R

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)
■
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
■
Fast turn-on time: typ. 200 µs
[CO = 1 µF, CBYP = 10 nF and IO = 1 mA]
■
Logic-controlled electronic shutdown
■
Internal current and thermal limit
■
Output low noise voltage 30 µVRMS over 10 Hz
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
The LD3985xx provides up to 150 mA, from 2.5 V
to 6 V input voltage.
Table 1.
SOT23-5L
TSOT23-5L
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
applications are in mobile phone and similar
battery powered wireless systems.
Device summary
Part number
December 2007
LD3985XX122
LD3985XX28
LD3985XX18
LD3985XX29
LD3985XX25
LD3985XX30
LD3985XX26
LD3985XX33
LD3985XX27
LD3985XX47
Rev 12
1/22
www.st.com
22
LD3985xx
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8
Order codes
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
LD3985xx
Diagram
1
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
Table 2.
Flip-chip
Pin description
Pin n° for
SOT23-5L/
TSOT23-5L
Pin n° for
Flip-chip
Symbol
1
4
VI
2
2
GND
Common ground
3
1
VINH
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)
4
5
BYPASS
Bypass pin: connect an external capacitor (usually 10 nF) to minimize
noise voltage
5
3
VO
4/22
Name and function
Input voltage of the LDO
Output voltage of the LDO
LD3985xx
Typical application
3
Typical application
Figure 3.
Typical application circuit
5/22
Maximum ratings
LD3985xx
4
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
-0.3 to 6 (1)
V
VI
DC input voltage
VO
DC output voltage
-0.3 to VI+0.3
V
INHIBIT input voltage
-0.3 to VI+0.3
V
VINH
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
-65 to 150
°C
TOP
Operating junction temperature range
-40 to 125
°C
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.
Thermal data
Symbol
Parameter
SOT23-5L/
TSOT23
RthJC
Thermal resistance junction-case
81
RthJA
Thermal resistance junction-ambient
255
6/22
Flip-chip
Unit
°C/W
170
°C/W
LD3985xx
Electrical characteristics
5
Electrical characteristics
Table 5.
Electrical characteristics for LD3985 (TJ = 25 °C, VI = VO(NOM) +0.5 V, CI = 1 µF, CBYP =
10 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified)
Symbol
Parameter
VI
Operating input voltage
VO
Output voltage < 2.5V
VO
Output voltage ≥ 2.5V
ΔVO
Line regulation (Note: 1)
ΔVO
ΔVO
ΔVO
Load regulation
Load regulation
Output AC Line regulation
Quiescent current
ON MODE: VINH = 1.2V
IQ
Test conditions
Min.
Typ.
Max.
Unit
2.5
6
V
IO = 1 mA
-50
50
TJ= -40 to 125°C
-75
75
IO = 1 mA
-2
2
TJ= -40 to 125°C
-3
3
VI = VO(NOM) + 0.5 to 6 V
TJ= -40 to 125°C
-0.1
0.1
VO = 4.7 to 5V
-0.19
mV
% of
VO(NOM)
%/V
0.19
IO = 1 mA to 150mA, VO < 2.5V
TJ= -40 to 125°C
0.002
0.008
IO = 1 mA to 150mA, VO ≥ 2.5V
TJ= -40 to 125°C (for flip-chip)
0.0004
0.002
IO = 1 mA to 150mA, TJ= -40 to 125°C
(for SOT23-5L/TSOT23-5L), VO ≥ 2.5V
0.0025
0.005
%/mA
%/mA
VI = VO(NOM) + 1 V, IO = 150mA,
tR= tF = 30µs
1.5
IO = 0
85
IO = 0, TJ= -40 to 125°C
mVPP
150
IO = 0 to 150mA
170
µA
IO = 0 to 150mA, TJ= -40 to 125°C
250
0.003
OFF MODE: VINH = 0.4V
TJ= -40 to 125°C
1.5
IO = 1mA
0.4
IO = 1mA, TJ= -40 to 125°C
2
IO = 50mA
VDROP
Dropout voltage (Note: 1)
20
IO = 50mA, TJ= -40 to 125°C
35
mV
IO = 100mA
45
IO = 100mA, TJ= -40 to 125°C
70
IO = 150mA
60
IO = 150mA, TJ= -40 to 125°C
ISC
SVR
Short circuit current
RL = 0
Supply voltage rejection
VI = VO(NOM)+0.25V ±
VRIPPLE = 0.1V, IO= 50mA
VO(NOM) < 2.5V, VI = 2.55V
100
600
f = 1kHz
60
f = 10kHz
50
mA
dB
7/22
Electrical characteristics
Table 5.
Electrical characteristics for LD3985 (continued) (TJ = 25 °C, VI = VO(NOM) +0.5 V, CI = 1
µF, CBYP = 10 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified)
Symbol
IO(PK)
LD3985xx
Parameter
Peak output current
Test conditions
VO ≥ VO(NOM) - 5%
Min.
Typ.
300
550
Inhibit input logic high
Unit
mA
0.4
Inhibit input logic low
VINH
Max.
VI = 2.5V to 6V, TJ= -40 to 125°C
V
1.2
IINH
Inhibit input current
VINH = 0.4V, VI = 6V
±1
nA
eN
Output noise voltage
BW = 10 Hz to 100 kHz, CO = 1µF
30
µVRMS
tON
Turn On time (Note 4)
CBYP = 10 nF
100
Thermal shutdown
Note 5
160
TSHDN
CO
Note:
8/22
250
µs
°C
Capacitance (Note 6)
1
22
µF
ESR
5
5000
mΩ
Output capacitor
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
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 VINH High Value
and the output voltage just reaching 95% of its nominal value
5
Typical thermal protection hysteresis is 20 °C
6
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.
LD3985xx
Typical performance characteristics
6
Typical performance characteristics
Figure 4.
(TJ = 25 °C, VI = VO(NOM) +0.5 V, CI = CO = 1 µF, CBYP = 10 nF, IO = 1mA, VINH = 1.4 V,
unless otherwise specified)
Output voltage vs temperature
Figure 5.
Output voltage vs temperature
Figure 6.
Output voltage vs temperature
Figure 7.
Shutdown voltage vs temperature
Figure 8.
Shutdown voltage vs temperature
Figure 9.
Line regulation vs temperature
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
VI = 3.3V, IO = 1mA, CI = CO = 1mF (cer), CBYP = 10nF,
Tf = 20ns, VO = 2.8V
12/22
LD3985xx
LD3985xx
7
Package mechanical data
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.
Min.
Typ.
Max.
A
0.90
1.45
35.4
57.1
A1
0.00
0.10
0.0
3.9
A2
0.90
1.30
35.4
51.2
b
0.35
0.50
13.7
19.7
C
0.09
0.20
3.5
7.8
D
2.80
3.00
110.2
118.1
E
1.50
1.75
59.0
68.8
e
0.95
37.4
H
2.60
3.00
102.3
118.1
L
0.10
0.60
3.9
23.6
7049676D
14/22
LD3985xx
Package mechanical data
TSOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
Max.
1.1
43.3
3.9
A1
0
0.1
A2
0.7
1.0
27.6
39.4
b
0.3
0.5
11.8
19.7
C
0.08
0.2
3.1
7.9
D
2.9
114.2
E
2.8
110.2
E1
1.6
63.0
e
0.95
37.4
e1
1.9
74.8
L
0.3
0.6
11.8
23.6
7282780B
15/22
Package mechanical data
LD3985xx
Flip-chip 5 mechanical data
mm.
mils.
Dim.
16/22
Min.
Typ.
Max.
Min.
Typ.
Max.
A
0.635
0.7
0.765
25.0
27.6
30.1
A1
0.21
0.25
0.29
8.3
9.8
11.4
A2
0.375
0.40
0.425
14.8
15.7
16.7
b
0.290
0.315
0.340
11.4
12.4
13.4
D
1.510
1.540
1.570
59.4
6.1
61.8
E
1.16
1.19
1.22
45.7
46.8
48.0
e
0.45
0.5
0.55
17.7
19.7
21.7
e1
0.816
0.866
0.916
32.1
34.1
36.1
f
0.345
13.6
f1
0.337
13.3
LD3985xx
Package mechanical data
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
180
13.0
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
14.4
0.519
0.567
Ao
3.13
3.23
3.33
0.123
0.127
0.131
Bo
3.07
3.17
3.27
0.120
0.124
0.128
Ko
1.27
1.37
1.47
0.050
0.054
0.0.58
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
3.9
4.0
4.1
0.153
0.157
0.161
17/22
Package mechanical data
LD3985xx
Tape & reel Flip-chip 5 mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
178
C
12.8
D
20.2
N
49
13.2
Max.
6.926
0.504
0.519
0.795
50
T
18/22
Max.
51
1.929
1.969
12.4
2.008
0.488
Ao
1.60
1.65
1.70
0.063
0.065
0.067
Bo
1.27
1.32
1.37
0.050
0.052
0.054
Ko
0.76
0.81
0.86
0.030
0.032
0.034
Po
3.9
4
4.1
0.153
0.157
0.161
P
3.9
4
4.1
0.153
0.157
0.161
LD3985xx
Package mechanical data
Tape & reel TSOT23-5L mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
180
13.0
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
14.4
0.519
0.567
Ao
3.13
3.23
3.33
0.123
0.127
0.131
Bo
3.07
3.17
3.27
0.120
0.124
0.128
Ko
1.27
1.37
1.47
0.050
0.054
0.0.58
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
3.9
4.0
4.1
0.153
0.157
0.161
19/22
Order codes
LD3985xx
8
Order codes
Table 6.
Order codes
Packages
SOT23-5L
TSOT23-5L
LD3985M122R
LD3985G122R
Output voltage
1.22 V
LD3985M18R
LD3985G18R
LD3985J18R
1.8 V
LD3985M25R
LD3985G25R
LD3985J25R
2.5 V
LD3985J26R
2.6 V
LD3985M26R
(1)
LD3985G26R
(1)
LD3985M27R
LD3985G27R
LD3985M28R
LD3985G28R
LD3985J28R
2.8 V
LD3985M29R
LD3985G29R
LD3985J29R
2.9 V
LD3985M30R
LD3985G30R
LD3985M33R
LD3985G33R
LD3985M47R
LD3985G47R
1. Available on request.
20/22
Flip-chip
(1)
2.7 V
3.0 V
LD3985J33R
3.3 V
4.7 V
LD3985xx
Revision history
9
Revision history
Table 7.
Document revision history
Date
Revision
Changes
07-May-2004
6
Part number status changed on table 3.
05-Oct-2004
7
tON values are changed on table 5.
27-Oct-2004
8
Order codes changed - Table 3.
17-Mar-2005
9
Improved drawing quality for figures 19-20-21-22.
10-Apr-2007
10
Order codes updated.
08-Jun-2007
11
Order code change.
20-Dec-2007
12
Modified: Table 1, Table 6, mechanical data for flip-chip.
21/22
LD3985xx
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22/22