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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 A typ. at no load, 200 A typ. at 300 mA load; max 1.5 A in off mode) 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 s - [CO = 2.2 F, CBYP = 33 nF and IO = 1 mA] Logic-controlled electronic shutdown Internal current and thermal limit Output low noise voltage 30 VRMS over 10 Hz to 100 kHz SVR of 55 dB at 1 kHz, 50 dB at 10 kHz Temperature range: - 40 C to 125 C 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 appliances.
DFN6
SOT23-5L

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 LDS3985XX15 LDS3985XX18 LDS3985XX25 LDS3985XX28 LDS3985XX30 LDS3985XX33 LDS3985XX50
Output voltages 1.5 V 1.8 V 2.5 V 2.8 V 3.0 V 3.3 V 5.0 V
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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
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Diagram
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Figure 1.
Diagram
Schematic diagram
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Pin configuration
LDS3985xx
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Figure 2.
Pin configuration
Pin connections (top view for SOT23-5L, top through view for DFN6)
SOT23-5L
DFN6
Table 2.
Pin n for SOT23-5L 1 2 3 4 5 -
Pin description
Pin n for DFN6 1 5 6 4 3 2 Symbol VI GND VINH BYPASS VO N.C. Input voltage of the LDO Common ground 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) Bypass pin: connect an external capacitor (usually 10 nF) to minimize noise voltage Output voltage of the LDO Not connect Name and function
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Typical application
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Figure 3.
Typical application
Typical application circuit
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Maximum ratings
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Table 3.
Maximum ratings
Absolute maximum ratings
Parameter DC input voltage DC output voltage INHIBIT input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value -0.3 to 6
(1)
Symbol VI VO VINH IO PD TSTG TOP
Unit V V V
-0.3 to VI+0.3 -0.3 to VI+0.3 Internally limited Internally limited -65 to 150 -40 to 125
C 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. Thermal data
Parameter Thermal resistance junction-case Thermal resistance junction-ambient SOT23-5L 81 255 DFN6 10 55 Unit C/W C/W
Table 4.
Symbol RthJC RthJA
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Electrical characteristics
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Electrical characteristics
TJ = 25 C, VI = VO(NOM) + 0.5 V, CI = 1 F, CO = 2.2 F, CBYP = 33 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified.
Table 5.
Symbol VI VO
Electrical characteristics for LDS3985xx
Parameter Operating input voltage Output voltage < 2.5 V IO = 1 mA TJ = - 40 to 125 C Output voltage 2.5 V IO = 1 mA TJ= - 40 to 125 C Line regulation (1) VI = VO(NOM) + 0.5 to 6 V, TJ = - 40 to 125 C VO = 4.7 to 5 V IO = 1 mA to 300 mA, VO 2.5 V TJ = - 40 to 125 C IO = 1 mA to 300 mA, VO 2.5 V TJ = - 40 to 125 C VI = VO(NOM) + 1 V, IO = 300 mA, tR = tF = 30 s IO = 0 IO = 0, TJ = - 40 to 125 C Quiescent current ON MODE: VINH = 1.24 V I = 0 to 300 mA O IO = 0 to 300 mA, TJ = - 40 to 125 C 0.003 OFF MODE: VINH = 0.4 V TJ = - 40 to 125 C IO = 1 mA IO = 1 mA, TJ = -40 to 125 C 0.4 2 60 mV 100 150 250 600 f = 1 kHz f = 10 kHz 300 55 dB 50 550 mA mA 1.5 Test conditions Min. 2.5 -50 -75 -2 -3 -0.1 -0.19 0.005 0.0008 5 85 150 200 A 300 Typ. Max. 6 50 mV 75 2 3 0.1 %/V 0.19 0.01 0.004 %/mA %/mA mVPP % of VO(NOM) Unit V
VO
VO
VO VO VO
Load regulation Load regulation Output AC line regulation
(2)
IQ
VDROP
Dropout voltage (3)
IO = 150 mA IO = 150 mA, TJ = - 40 to 125 C IO = 300 mA IO = 300 mA, TJ = - 40 to 125 C
ISC
Short circuit current
RL = 0 VI = VO(NOM)+0.25 V VRIPPLE = 0.1 V, IO = 50 mA For VO(NOM) < 2.5 V, VI = 2.55 V VO VO(NOM) - 5 %
SVR
Supply voltage rejection
IO(PK)
Peak output current
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Electrical characteristics Table 5.
Symbol VINH IINH eN tON TSHDN CO
LDS3985xx
Electrical characteristics for LDS3985xx (continued)
Parameter Inhibit input logic Low Inhibit input logic High Inhibit input current Output noise voltage Turn On time
(4)
Test conditions VI = 2.5 V to 6 V, TJ= - 40 to 125 C VINH = 0.4 V, VI = 6 V BW = 10 Hz to 100 kHz, CO = 2.2 F CBYP = 33 nF
(5)
Min.
Typ.
Max. 0.4
Unit V
1.4 1 30 240 160 2.2 5 22 5000 nA VRMS s C F m
Thermal shutdown Output capacitor
Capacitance 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
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Typical performance characteristics
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Typical performance characteristics
TJ = 25 C, VI = VO(NOM) + 0.5 V, CI = 1 F, CO = 2.2 F, CBYP = 33 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Output voltage vs. temp. (VI = 2.5 V) Figure 5. Output voltage vs. temp. (VI = 3.2 V)
Figure 4.
Figure 6.
Output voltage vs. temp. (VI = 3.8 V) Figure 7.
Shutdown voltage vs. temperature (VO = 1.35 V)
Figure 8.
Shutdown voltage vs. temperature (VO = 3.3 V)
Figure 9.
Line regulation vs. temperature (VI = 2.5 V to 6 V)
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Typical performance characteristics
LDS3985xx
Figure 10. Line regulation vs. temperature (VI = 3.2 V to 6 V)
Figure 11. Line regulation vs. temperature (VI = 3.8 V to 6 V)
Figure 12. Quiescent current vs. temperature (VI = 2.5 V)
Figure 13. Quiescent current vs. temperature (VI = 6 V)
Figure 14. Quiescent current vs. temperature (VI = 3.4 V)
Figure 15. Supply voltage rejection vs. frequency
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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 F (cer), CBYP = 10 nF, TR = TF = 1 s
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Package mechanical data
LDS3985xx
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Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark.
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Package mechanical data
SOT23-5L mechanical data
mm. Dim. Min. A A1 A2 b C D E e H L 2.60 0.10 0.90 0.00 0.90 0.35 0.09 2.80 1.50 0.95 3.00 0.60 102.3 3.9 Typ. Max. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 Min. 35.4 0.0 35.4 13.7 3.5 110.2 59.0 37.4 118.1 23.6 Typ. Max. 57.1 3.9 51.2 19.7 7.8 118.1 68.8 mils.
7049676D
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Package mechanical data
LDS3985xx
DFN6 (3x3 mm) mechanical data
mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.30 0.23 2.90 2.23 2.90 1.50 0.80 0 Typ. 0.90 0.02 0.20 0.30 3.00 2.38 3.00 1.65 0.95 0.40 0.50 0.012 0.38 3.10 2.48 3.10 1.75 0.009 0.114 0.088 0.114 0.059 Max. 1.00 0.05 Min. 0.031 0 Typ. 0.035 0.001 0.008 0.012 0.118 0.094 0.118 0.065 0.037 0.016 0.020 0.015 0.122 0.098 0.122 0.069 Max. 0.039 0.002 inch.
7946637A
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Package mechanical data
DFN6D (3x3 mm) mechanical data
mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.30 0.23 2.90 2.23 2.90 1.50 0.95 0.40 0.50 0.012 3.00 3.00 0.80 0 0.02 0.20 0.45 3.10 2.50 3.10 1.75 0.009 0.114 0.088 0.114 0.059 0.037 0.016 0.020 0.118 0.118 Typ. Max. 1.00 0.05 Min. 0.031 0 0.001 0.008 0.018 0.122 0.098 0.122 0.069 Typ. Max. 0.039 0.002 inch.
7946637B
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Package mechanical data
LDS3985xx
Tape & reel SOT23-xL mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 3.13 3.07 1.27 3.9 3.9 3.23 3.17 1.37 4.0 4.0 12.8 20.2 60 14.4 3.33 3.27 1.47 4.1 4.1 0.123 0.120 0.050 0.153 0.153 0.127 0.124 0.054 0.157 0.157 13.0 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 0.131 0.128 0.0.58 0.161 0.161 0.512 Min. Typ. Max. 7.086 0.519 inch.
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Package mechanical data
Tape & reel QFNxx/DFNxx (3x3) mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 3.3 3.3 1.1 4 8 12.8 20.2 60 14.4 0.130 0.130 0.043 0.157 0.315 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 Min. Typ. Max. 7.087 0.519 inch.
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Order codes
LDS3985xx
8
Table 6.
Order codes
Order codes
Packages Output voltage SOT23-5L LDS3985M125R (1) LDS3985M135R
(1)
DFN6 LDS3985PM12R (1) LDS3985PM13R LDS3985PM15R LDS3985PM18R
(1) (1) (1)
DFN6D 1.25 V 1.35 V LDS3985PU15R 1.5 V 1.8 V 2.0 V 2.1 V 2.2 V 2.5 V 2.6 V 2.7 V LDS3985PU28R 2.8 V 2.85 V 2.9 V 3.0 V LDS3985PU33R 3.3 V 4.7 V 4.8 V 4.9 V 5.0 V
LDS3985M15R LDS3985M18R LDS3985M20R (1) LDS3985M21R LDS3985M22R
(1) (1)
LDS3985PM20R (1) LDS3985PM21R LDS3985PM22R LDS3985PM25R
(1) (1) (1)
LDS3985M25R LDS3985M26R (1) LDS3985M27R
(1)
LDS3985PM26R (1) LDS3985PM27R
(1)
LDS3985M28R LDS3985M285R
(1)
LDS3985PM285R
(1)
LDS3985M29R (1) LDS3985M30R LDS3985M33R LDS3985M47R
(1)
LDS3985PM29R (1) LDS3985PM30R
(1)
LDS3985PM47R
(1)
LDS3985M48R (1) LDS3985M49R
(1)
LDS3985PM48R (1) LDS3985PM49R LDS3985PM50R
(1) (1)
LDS3985M50R
1. Available on request.
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Revision history
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Table 7.
Date
Revision history
Document revision history
Revision 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. Changes
02-Dec-2004 10-Apr-2007 16-May-2007 06-Sep-2007 11-Jun-2008 11-Jul-2009 29-Jul-2010
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LDS3985xx
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