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LD2981 SERIES
VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
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ULTRA LOW DROPOUT VOLTAGE (0.2V AT 100mA LOAD, 7mV AT 1mA LOAD) VERY LOW QUIESCENT CURRENT (MAX 1A WHEN IS IN SHUTDOWN MODE) OUTPUT CURRENT UP TO 100 mA LOGIC-CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGES OF 2.85; 3.0; 3.2; 3.3; 3.8; 4.85; 5.0V INTERNAL CURRENT AND THERMAL LIMIT AVAILABLEIN 0.75% TOLLERANCE (AT 25oC, A VERSION) OUTPUT LOW NOISE VOLTAGE 160Vrms ONLY 4.7F FOR STABILITY TEMPERATURE RANGE: -40 TO 125 oC SMALLEST PACKAGE SOT23-5L AND SOT-89 FAST DYNAMIC RESPONCE TO LINE AND LOAD CHANGES
SOT23-5L
SOT-89
DESCRIPTION The LD2981 series are 100mA fixed-output voltage regulator. The ultra drop-voltage and the ultra low quiescent current make them particularly suitable for low noise, low power applications and in battery powered systems.
In sleep mode quiescent current is less than 1A when INHIBIT pis is pulled low. Shutdown Logic Control function is available on pin n.3 (TTL compatible). 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. Typlical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
SCHEMATIC DIAGRAM
September 1999
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LD2981
ABSOLUTE MAXIMUM RATING
Symbol V IN V I NH Io P tot T st g T op DC Input Voltage INHBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 16 16 Internally limited Internally limited - 55 to 150 - 40 to 125 Unit V V mA mW
o o
C C
THERMAL DATA
Symbol Parameter SOT-89 15 SOT23-5L 81 Unit
o
R thj- ca se Thermal Resistance Junction-case
C/W
CONNECTION DIAGRAM (top view)
SOT23-5L
SOT-89
(*) Inhibit pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V
ORDERING NUMBERS
AB VERSION SO T23-5L LD2981ABM28TR LD2981ABM30TR LD2981ABM32TR LD2981ABM33TR LD2981ABM38TR LD2981ABM48TR LD2981ABM50TR SOT-89 LD2981ABU28TR LD2981ABU30TR LD2981ABU32TR LD2981ABU33TR LD2981ABU38TR LD2981ABU48TR LD2981ABU50TR SOT23-5L LD2981CM28TR LD2981CM30TR LD2981CM32TR LD2981CM33TR LD2981CM38TR LD2981CM48TR LD2981CM50TR C VERSION SO T-89 LD2981CU28TR LD2981CU30TR LD2981CU32TR LD2981CU33TR LD2981CU38TR LD2981CU48TR LD2981CU50TR 2.85 V 3.0 V 3.2 V 3.3 V 3.8 V 4.85 V 5.0 V Output Voltage
APPLICATION CIRCUIT
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LD2981
ELECTRICAL CHARACTERISTICS FOR LD2981AB (refer to the test circuits, T J = 25 oC, VIN = VO(NOM) +1, CO = 1 F, IO = 1mA, VINH = 2V, unless otherwise specified)
Symbol Vo Parameter Output Voltage Test Conditions VIN = 3.85 V 1 < Io < 100 mA 1 < Io < 100 mA, VIN = 4 V 1 < Io < 100 mA 1 < Io < 100 mA, VIN = 4.2 V 1 < Io < 100 mA 1 < Io < 100 mA, VIN = 4.3 V 1 < Io < 100 mA, 1 < Io < 100 mA, VIN = 4.8 V 1 < Io < 100 mA, 1 < Io < 100 mA, VIN = 5.85 V 1 < Io < 100 mA, 1 < Io < 100 mA, VIN = 6 V 1 < Io < 100 mA, 1 < Io < 100 mA, Min. 2.828 2.822 2.779 2.977 2.970 2.925 3.176 3.168 3.12 3.275 3.267 3.217 3.771 3.762 3.705 4.813 4.801 4.729 4.962 4.950 4.875 150 VO(NOM) +1 < VIN < 16V, -40 < TJ < 125 oC ON MODE Io = 0 mA Io = 0 mA Io = 1 mA Io = 1 mA Io = 25 mA Io = 25 mA Io = 100 mA Io = 100 mA Io = 1 mA 0.003 0.014 0.032 100 150 150 200 400 800 1300 2600 0.8 2 63 1 -40 < T J < 125 oC 7 -40 < T J < 125 oC 70 -40 < TJ < 125 oC 200 -40 < TJ < 125 oC -40 < TJ < 125 C
o o
Typ. 2.85
Max. 2.872 2.878 2.921 3.023 3.030 3.075 3.224 3.232 3.28 3.325 3.333 3.383 3.829 3.838 3.895 4.887 4.899 4.971 5.038 5.050 5.125
Unit V V V V V V V V V V V V V V V V V V V V V mA %/V in
-40 < TJ < 125 oC
Vo
Output Voltage
3
-40 < TJ < 125 oC
Vo
Output Voltage
3.2
-40 < TJ < 125 oC
Vo
Output Voltage
3.3
-40 < TJ < 125 oC
Vo
Output Voltage
3.8
-40 < TJ < 125 oC
Vo
Output Voltage
4.85
-40 < TJ < 125 oC
Vo
Output Voltage
5
-40 < TJ < 125 oC
I o ut V o Id
Output Current Limit Line Regulation Quiescent Current
80 -40 < T J < 125 oC 100 -40 < T J < 125 oC 250 -40 < TJ < 125 oC 800 -40 < TJ < 125 oC
A A A A A A A A A A dB mV mV mV mV mV mV mV mV V V A A V mA 3/12
OFF MODE VINH < 0.3 V o VINH < 0.15 V -40 < TJ < 125 C SVR Vd Supply Voltage Rejection Dropout Voltage f = 1 KHz, Cout = 10 F Io = 0 mA Io = 0 mA Io = 1 mA Io = 1 mA Io = 25 mA Io = 25 mA Io = 100 mA Io = 100 mA
3 5 10 15 100 150 250 375 0.18
V il V ih Ii eN I SC
Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage (RMS) Short Circuit Current
LOW = Output OFF -40 < TJ < 125 oC HIGH = Output ON VINH = 0 V , VINH = 5 V, RL = 0 2 0 5 160 150 -40 < TJ < 125 C -40 < TJ < 125 oC
-1 15
BW = 300 Hz to 50 KHz, Cout = 10 F
LD2981
ELECTRICAL CHARACTERISTICS FOR LD2981C (refer to the test circuits, T J = 25 oC, VIN = VO(NOM) +1, CO = 1 F, IO = 1mA, VINH = 2V, unless otherwise specified)
Symbol Vo Parameter Output Voltage Test Conditions VIN = 3.85 V 1 < Io < 100 mA 1 < Io < 100 mA, VIN = 4 V 1 < Io < 100 mA 1 < Io < 100 mA, VIN = 4.2 V 1 < Io < 100 mA 1 < Io < 100 mA, VIN = 4.3 V 1 < Io < 100 mA, 1 < Io < 100 mA, VIN = 4.8 V 1 < Io < 100 mA, 1 < Io < 100 mA, VIN = 5.85 V 1 < Io < 100 mA, 1 < Io < 100 mA, VIN = 6 V 1 < Io < 100 mA, 1 < Io < 100 mA, Min. 2.814 2.793 2.750 2.962 2.940 2.895 3.160 3.136 3.088 3.259 3.234 3.184 3.752 3.724 3.667 4.789 4.753 4.680 4.937 4.900 4.825 150 VO(NOM) +1 < VIN < 16V, -40 < TJ < 125 oC ON MODE Io = 0 mA Io = 0 mA Io = 1 mA Io = 1 mA Io = 25 mA Io = 25 mA Io = 100 mA Io = 100 mA Io = 1 mA 0.003 0.014 0.032 100 150 150 200 400 800 1300 2600 0.8 2 63 1 -40 < T J < 125 oC 7 -40 < T J < 125 oC 70 -40 < TJ < 125 oC 200 -40 < TJ < 125 oC -40 < TJ < 125 C
o o
Typ. 2.85
Max. 2.886 2.907 2.950 3.038 3.060 3.105 3.240 3.264 3.312 3.341 3.366 3.416 3.848 3.876 3.933 4.911 4.947 5.020 5.063 5.100 5.175
Unit V V V V V V V V V V V V V V V V V V V V V mA %/V in
-40 < TJ < 125 oC
Vo
Output Voltage
3
-40 < TJ < 125 oC
Vo
Output Voltage
3.2
-40 < TJ < 125 oC
Vo
Output Voltage
3.3
-40 < TJ < 125 oC
Vo
Output Voltage
3.8
-40 < TJ < 125 oC
Vo
Output Voltage
4.85
-40 < TJ < 125 oC
Vo
Output Voltage
5
-40 < TJ < 125 oC
I o ut V o Id
Output Current Limit Line Regulation Quiescent Current
80 -40 < T J < 125 oC 100 -40 < T J < 125 oC 250 -40 < TJ < 125 oC 800 -40 < TJ < 125 oC
A A A A A A A A A A dB mV mV mV mV mV mV mV mV V V A A V mA
OFF MODE VINH < 0.3 V o VINH < 0.15 V -40 < TJ < 125 C SVR Vd Supply Voltage Rejection Dropout Voltage f = 1 KHz, Cout = 10 F Io = 0 mA Io = 0 mA Io = 1 mA Io = 1 mA Io = 25 mA Io = 25 mA Io = 100 mA Io = 100 mA
3 5 10 15 100 150 250 375 0.18
V il V ih Ii eN I SC 4/12
Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage (RMS) Short Circuit Current
LOW = Output OFF -40 < TJ < 125 oC HIGH = Output ON VINH = 0 V , VINH = 5 V, RL = 0 2 0 5 160 150 -40 < TJ < 125 C -40 < TJ < 125 oC
-1 15
BW = 300 Hz to 50 KHz, Cout = 10 F
LD2981
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified TJ=25oC, CIN=COUT=1F) Output Voltage vs Temperature Output Voltage vs Temperature
Output Voltage vs Input Voltage
Output Voltage vs Input Voltage
Output Voltage vs Output Current
Output Voltage vs Output Current
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LD2981
TYPICAL PERFORMANCE CHARACTERISTICS (continued) Line Regulation vs Temperature Dropout Voltage vs Temperature
Dropout Voltage vs Output Current
Quiescent Current vs Temperature
Quiescent Current vs Output Current
Quiescent Current vs Input Voltage
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LD2981
TYPICAL PERFORMANCE CHARACTERISTICS (continued) S.V.R. vs Frequency S.V.R. vs Temperature
S.V.R. vs Output Current
Stability
Short Circuit Current vs Droput Voltage
Reverse Current vs Reverse Voltage
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LD2981
TYPICAL PERFORMANCE CHARACTERISTICS (continued) Output Voltage vs Inhibit Voltage Inhibit Current vs Temperature
Supply Voltage Rejection at VOUT=2.85V
Supply Voltage Rejection at VOUT=5V
VIN = 7.35 2.5V, IOUT = 0.1A, f = 1KHz
VIN = 9 2.5V, IOUT = 0.1A, f = 1KHz
Line Transient Response
Line Transient Response
VIN = 4.75 to 5.25V, IOUT = 0.1A,CO = 10F (ESR=1 at 1KHz)
VIN = 4.75 to 5.25V, I OUT = 0.1A,CO = 10F (ESR=1 at 1KHz)
8/12
LD2981
TYPICAL PERFORMANCE CHARACTERISTICS (continued) Load Transient Response Load Transient Response
VCC = 5V, IOUT = 1 to 100mA,CIN = 150nF COUT = 10F (ESR=1 at 1KHz)
VCC = 5V, IOUT = 1 to 100mA,C IN = 150nF COUT = 10F (ESR=1 at 1KHz)
Shutdown Transient Response
VOUT = 5V, VIN = 6V, VINH = 0 to 5V, C IN = COUT = 1 F (Tant.)
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LD2981
SOT-89 MECHANICAL DATA
mm MIN. A B B1 C C1 D D1 E e e1 H L 1.4 0.44 0.36 0.35 0.35 4.4 1.62 2.29 1.42 2.92 3.94 0.89 TYP. MAX. 1.6 0.56 0.48 0.44 0.44 4.6 1.83 2.6 1.57 3.07 4.25 1.2 MIN. 55.1 17.3 14.2 13.8 13.8 173.2 63.8 90.2 55.9 115.0 155.1 35.0 mils TYP. MAX. 63.0 22.0 18.9 17.3 17.3 181.1 72.0 102.4 61.8 120.9 167.3 47.2
DIM.
P025H
10/12
LD2981
SOT23-5L MECHANICAL DATA
mm MIN. A A1 A2 b C D E E1 L e e1 0.90 0.00 0.90 0.35 0.09 2.80 2.60 1.50 0.35 0.95 1.9 TYP. MAX. 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75 0.55 MIN. 35.4 0.0 35.4 13.7 3.5 110.2 102.3 59.0 13.7 37.4 74.8 mils TYP. MAX. 57.1 5.9 51.2 19.7 7.8 118.1 118.1 68.8 21.6
DIM.
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LD2981
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a trademark of STMicroelectronics (c) 1999 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com .
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