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(R)
LD2979 SERIES
VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
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VERY LOW DROPOUT VOLTAGE (0.2V TYP. AT 50mA LOAD) VERY LOW QUIESCENT CURRENT (TYP. 500A AT50mA LOAD) OUTPUT CURRENT UP TO 50 mA LOGIC-CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGES OF 2.85; 3.0; 3.2; 3.3; 3.8; 5.0V INTERNAL CURRENT AND THERMAL LIMIT SUPPLY VOLTAGE REJECTION: 63dB (TYP) ONLY 1F FOR STABILITY SELECTION AT 25 oC TEMPERATURE RANGE: -25 TO 125 oC PACKAGE AVAILABLE:SOT23-5L AND TO-92
SOT23-5L
DESCRIPTION The LD2979 series are very Low Drop regulators available in SOT23-5L and TO-92. The very low drop-voltage and the very low quiescent current make them particularly suitable for low noise, low power applications and in battery powered systems. Shutdown Logic Control function is available on five pin version (TTL compatible). This means
TO-92
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.
SCHEMATIC DIAGRAM
April 2000
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LD2979
ABSOLUTE MAXIMUM RATING
Symbol V IN V I NH Io P tot T st g T op DC Input Voltage DC Inhibit Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 16 VI N Internally limited Internally limited - 40 to 150 - 25 to 125 Unit V V mA mW
o o
C C
CONNECTION DIAGRAM (top view)
BOTTOM VIEW
SOT23-5L SYMBOL NAME AND FUNCTION SO T23-5L VI N GND INHIBIT NC V OUT Input Voltage Ground Control Switch ON/OF F (*) Not to be connected Output Voltage 1 2 3 4 5
TO-92 PIN NUMBER T O-92 3 2 1
(*) Only for the version in SOT23-5L package: Inhibit pin is not internally pulled-up then it must not be left floating. Connect to a positive voltage higher than 2V to able the device.
ORDERING NUMBERS
SOT23-5L LD2979M28 LD2979M30 LD2979M32 LD2979M33 LD2979M38 LD2979M50 LD2979Z28 LD2979Z30 LD2979Z32 LD2979Z33 LD2979Z38 LD2979Z50 TO-92 Output Voltage 2.85 V 3.0 V 3.2 V 3.3 V 3.8 V 5.0 V
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LD2979
ELECTRICAL CHARACTERISTICS FOR LD2979 (refer to the test circuits, T a = 25 oC, VIN = VO(NOM) +1, CO = 1 F, IO = 1mA, Vinh = 2V(*)) (unless otherwise specified)
Symbol Vo Vo Vo Vo Vo Vo I o ut V o Id Parameter Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Current Limit Line Regulation Quiescent Current VO(NOM) +1 < VIN < 16V, o -25 < Ta < 125 C ON MODE Io = 0 mA Io = 0 mA Io = 50 mA Io = 50 mA Io = 1 mA Test Conditions VIN = 3.85 V 1 < Io < 50 mA, VIN = 4 V 1 < Io < 50 mA, VIN = 4.2 V 1 < Io < 50 mA, VIN = 4.3 V 1 < Io < 50 mA, VIN = 4.8 V 1 < Io < 50 mA, VIN = 6 V 1 < Io < 50 mA, -25 < Ta < 125 oC -25 < Ta < 125 oC -25 < Ta < 125 oC -25 < Ta < 125 oC -25 < Ta < 125 oC -25 < Ta < 125 oC Min. 2.793 2.736 2.940 2.880 3.136 3.072 3.234 3.168 3.724 3.648 4.9 4.8 100 0.028 0.064 80 -25 < Ta < 125 oC 500 -25 < Ta < 125 oC 0 1 63 6 -25 < Ta < 125 oC 30 -25 < Ta < 125 oC 100 -25 < Ta < 125 oC 200 -25 < Ta < 125 C Device Off Device On 2 0 5 160 -1 15
o o
Typ. 2.85 3 3.2 3.3 3.8 5
Max. 2.907 2.964 3.060 3.120 3.264 3.328 3.366 3.432 3.876 3.952 5.1 5.2
Unit V V V V V V V V V V V V mA %/V in
110 170 700 1300
A A A A A A dB mV mV mV mV mV mV mV mV V V A A V
OFF MODE (*) Vihn < 0.18 V Vihn < 0.18 V -25 < Ta < 125 oC SVR Vd Supply Voltage Rejection Dropout Voltage Io = 50 mA, f = 120 Hz, Cout = 10 F Io = 0 mA Io = 0 mA Io = 1 mA Io = 1 mA Io = 10 mA Io = 10 mA Io = 50 mA Io = 50 mA
12 18 60 90 200 300 400 600 0.18
V il V ih Ii eN
Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage (RMS)
-25 < Ta < 125 oC (*) -25 < Ta < 125 C (*)
Vinhibit = 0 V (*) -25 < Ta < 125 oC (*) Vinhibit = 5 V, BW = 300 Hz to 50 KHz, Cout = 10 F
(*) Note: Only for types in SOT23-5L
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LD2979
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Ta=25oC) Output Voltage vs Temperature Output Voltage vs Input Voltage
Output Voltage vs Input Voltage
Dropout Voltage vs Output Current
Dropout Voltage vs Temperature
Quiescent Current vs Temperature
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LD2979
TYPICAL PERFORMANCE CHARACTERISTICS (continued) Short Circuit Current vs Dropout Voltgae S.V.R. vs Frequency
Inhibit Current vs Temperature
Inhibit Voltage vs Temperature
Load Transient Response
Load Transient Response
Vout 20mV/ DIV
Vout
Vout 20mV/ DIV
Vout
Iout
Iout 20mA/ DIV
Iout
Iout 20mA/ DIV
Vin: 5V, Iout: 1mA to 50mA, Time : 10us/DIV
CO = 10F (ESR=1 at 1KHz)
Vin: 5V, Iout: 50mA to 1mA, Time : 10us/DIV
CO = 10F (ESR=1 at 1KHz)
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LD2979
TYPICAL PERFORMANCE CHARACTERISTICS (continued) Line Transient Response
Vout
Vin
Vin : 200mV/DIV, Vout: 5mV/DIV, Time : 20us/DIV
VCC = 4.75 to 5.25V, IOUT = 0.1A, CO = 10F (ESR=1 at 1KHz)
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LD2979
TO-92 MECHANICAL DATA
mm DIM. MIN. TYP. MAX. MIN.
inch
TYP.
MAX.
A
4.58
5.33
0.180
0.210
B
4.45
5.2
0.175
0.204
C
3.2
4.2
0.126
0.165
D
12.7
0.500
E
1.27
0.050
F
0.4
0.51
0.016
0.020
G
0.35
0.14
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LD2979
Information furnished is believed to be accurate and reliable. However, STMicroelectronic s 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 withoutexpress written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2000 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com .
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