STMicroelectronics LD3985G27R Ultra low drop-low noise bicmos voltage regulators low esr capacitors compatible Datasheet

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 (60 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)
■
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
■
SVR of 60 dB at 1 kHz, 50 dB at 10 kHz
■
Temperature range: - 40 °C to 125 °C
Flip-chip
(1.57 x 1.22)
SOT23-5L
TSOT23-5L
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.
Description
The LD3985xx provides up to 150 mA, from 2.5 V
to 6 V input voltage. 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
Table 1.
Device summary
Part numbers
January 2011
LD3985XX122
LD3985XX28
LD3985XX18
LD3985XX29
LD3985XX25
LD3985XX30
LD3985XX26
LD3985XX33
LD3985XX27
LD3985XX47
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www.st.com
23
Contents
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/23
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LD3985xx
Diagram
1
Diagram
Figure 1.
Schematic diagram
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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
5
3
VO
4/23
Name and function
Input voltage of the LDO
Bypass pin: connect an external capacitor (usually 10 nF) to minimize
noise voltage
Output voltage of the LDO
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LD3985xx
Typical application
3
Typical application
Figure 3.
Typical application circuit
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Maximum ratings
LD3985xx
4
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
(1)
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
-0.3 to 6
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
V
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
SOT23-5L/
TSOT23
Parameter
RthJC
Thermal resistance junction-case
81
RthJA
Thermal resistance junction-ambient
255
6/23
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Flip-chip
Unit
°C/W
170
°C/W
LD3985xx
5
Electrical characteristics
Electrical characteristics
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.
Table 5.
Symbol
Electrical characteristics for LD3985
Parameter
VI
Operating input voltage
VO
Output voltage < 2.5 V
VO
Output voltage ≥ 2.5 V
ΔVO
Line regulation (1)
ΔVO
ΔVO
ΔVO
Load regulation
Load regulation
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
%/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
1.5
IO = 0
85
IQ
IO = 0, TJ= -40 to 125°C
IO = 0 to 150mA
%/mA
%/mA
Output AC Line regulation VI = VO(NOM) + 1 V, IO = 150mA,
(2)
tR= tF = 30µs
Quiescent current
ON MODE: VINH = 1.2 V
% of
VO(NOM)
mVPP
150
170
µA
IO = 0 to 150mA, TJ= -40 to 125°C
250
0.003
OFF MODE: VINH = 0.4 V
TJ= -40 to 125°C
IO = 1mA
1.5
0.4
IO = 1mA, TJ= -40 to 125°C
IO = 50mA
VDROP
Dropout voltage (3)
2
20
IO = 50mA, TJ= -40 to 125°C
IO = 100mA
35
mV
45
IO = 100mA, TJ= -40 to 125°C
IO = 150mA
70
60
IO = 150mA, TJ= -40 to 125°C
ISC
Short circuit current
RL = 0
100
600
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mA
7/23
Electrical characteristics
Table 5.
Symbol
SVR
IO(PK)
LD3985xx
Electrical characteristics for LD3985 (continued)
Parameter
Supply voltage rejection
Peak output current
Test conditions
VI = VO(NOM)+0.25V ±
VRIPPLE = 0.1V, IO= 50mA
VO(NOM) < 2.5V, VI = 2.55V
Min.
Typ.
f = 1kHz
60
f = 10kHz
50
Inhibit input logic high
Unit
dB
VO ≥ VO(NOM) - 5%
300
550
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
CBYP = 10 nF
100
(5)
160
tON
TSHDN
Turn On time
(4)
Thermal shutdown
Capacitance
CO
(6)
250
µs
°C
1
22
µF
5
5000
mΩ
Output capacitor
ESR
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
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
8/23
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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 = 1 mA, 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
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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
10/23
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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
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Typical performance characteristics
LD3985xx
Figure 22. Turn-Off
VI = 3.3V, IO = 1mA, CI = CO = 1mF (cer), CBYP = 10nF,
Tf = 20ns, VO = 2.8V
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LD3985xx
7
Package mechanical data
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.
Doc ID 9587 Rev 14
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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
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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
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Package mechanical data
Table 6.
LD3985xx
Flip-chip 5 mechanical data
mm.
16/23
Dim.
Min.
Typ.
Max.
A
0.54
0.65
0.66
A1
0.21
0.25
0.29
A2
0.33
0.35
0.37
b
0.265
0.315
0.365
D
1.54
1.59
1.64
D1
0.83
0.87
0.91
E
1.19
1.24
1.29
E1
0.46
0.5
0.54
eD
0.395
0.435
0.475
eE
0.21
0.25
0.29
fD
0.360
fE
0.370
ccc
0.080
$
0.05
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LD3985xx
Package mechanical data
Figure 23. Drawing dimension Flip-chip 5
7224716/N
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Package mechanical data
LD3985xx
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
180
13.0
13.2
Max.
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
18/23
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
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LD3985xx
Package mechanical data
Tape & reel Flip-chip 5 mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
178
C
12.8
D
20.2
N
49
13.2
Max.
6.926
0.504
0.519
0.795
50
T
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
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Package mechanical data
LD3985xx
Tape & reel TSOT23-5L mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
180
13.0
13.2
Max.
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
20/23
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
Doc ID 9587 Rev 14
LD3985xx
Order codes
8
Order codes
Table 7.
Order codes
Packages
SOT23-5L
TSOT23-5L
LD3985M122R
LD3985G122R (1)
LD3985M18R
LD3985G18R
LD3985J18R
1.8 V
LD3985M25R
LD3985G25R
LD3985J25R
2.5 V
LD3985J26R
2.6 V
LD3985M26R
(1)
LD3985G26R
Flip-chip
(1)
LD3985M27R
LD3985G27R
LD3985M28R
LD3985G28R
LD3985M29R
Output voltage
1.22 V
2.7 V
LD3985J28R
2.8 V
LD3985J29R
2.9 V
LD3985M30R
LD3985G30R
LD3985J30R
3.0 V
LD3985M33R
LD3985G33R
LD3985J33R
3.3 V
LD3985M47R
LD3985G47R
4.7 V
1. Available on request.
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Revision history
LD3985xx
9
Revision history
Table 8.
Document revision history
Date
Revision
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 7, mechanical data for Flip-chip.
02-Dec-2008
13
Modified: Table 6 on page 16 and Figure 23 on page 17.
03-Jan-2011
14
Modified: Features on page 1 and Table 7 on page 21.
22/23
Changes
Doc ID 9587 Rev 14
LD3985xx
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