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LD2985 SERIES
VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION
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VERY LOW DROPOUT VOLTAGE (280mV AT 150mA AND 7mV AT 1mA LOAD) VERY LOW QUIESCENT CURRENT (2mA TYP. AT 150mA LOAD AND 80A AT NO LOAD) OUTPUT CURRENT UP TO 150mA LOGIC CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGE OF 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V INTERNAL CURRENT AND THERMAL LIMIT AVAILABLE IN 1% TOLLERANCE (AT 25C, A VERSION) LOW OUTPUT NOISE VOLTAGE 30Vrms SMALLEST PACKAGE SOT23-5L TEMPERATURE RANGE: -40C TO 125C
SOT23-5L
DESCRIPTION The LD2985 is a 150mA fixed output voltage regulator. The ultra low drop voltage and the 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 pin is pulled low. Shutdown Logic Control Function
is available on pin 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. An external capacitor, CBYP=10nF, connected between bypass pin and GND reduce the noise to 30Vrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
SCHEMATIC DIAGRAM
July 2003
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LD2985 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol VI VINH IO Ptot Tstg Top DC Input Voltage INHIBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 16 16 Internally limited Internally limited -65 to +150 -40 to +125 C C Unit V V
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
THERMAL DATA
Symbol Rthj-case Parameter Thermal Resistance Junction-case SOT23-5L 81 Unit C/W
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
Pin N Symbol 1 2 3 Name and Function
4 SOT23-5L 5
IN Input Port GND Ground Pin INHIBIT Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V Bypass Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances. OUT Output Port
ORDERING CODES
A VERSION LD2985AM15R LD2985AM18R LD2985AM25R LD2985AM28R LD2985AM285R LD2985AM30R LD2985AM31R LD2985AM32R LD2985AM33R LD2985AM35R LD2985AM36R LD2985AM38R LD2985AM40R LD2985AM47R LD2985AM50R B VERSION LD2985BM15R LD2985BM18R LD2985BM25R LD2985BM28R LD2985BM285R LD2985BM30R LD2985BM31R LD2985BM32R LD2985BM33R LD2985BM35R LD2985BM36R LD2985BM38R LD2985BM40R LD2985BM47R LD2985BM50R OUTPUT VOLTAGES 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.1V 3.2V 3.3V 3.5V 3.6V 3.8V 4.0V 4.7V 5.0V
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ELECTRICAL CHARACTERISTICS FOR LD2985A (TJ = 25C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1F, CO = 1F, unless otherwise specified)
Symbol VOp VO Parameter Operating Input Voltage Output Voltage VI = 2.5V IO = 1 to 50mA IO = 1 to 50mA VO Output Voltage VI = 2.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.85V IO = 1 to 50mA IO = 1 to 50mA VO Output Voltage VI = 4.0V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.1V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.2V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.3V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.6V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 5.0V IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C Test Conditions Min. 2.5 1.485 1.462 1.447 1.782 1.755 1.737 2.475 2.4375 2.4125 2.772 2.730 2.702 2.821 2.778 2.750 2.970 2.925 2.895 3.069 3.022 2.9915 3.168 3.120 3.088 3.267 3.2175 3.1845 3.465 3.412 3.377 3.564 3.510 3.474 3.762 3.705 3.667 3.96 3.9 3.86 4 3.8 3.6 3.5 3.3 3.2 3.1 3.0 2.85 2.8 2.5 1.8 1.5 Typ. Max. 16 1.515 1.538 1.553 1.818 1.845 1.863 2.525 2.5625 2.5875 2.828 2.870 2.898 2.879 2.921 2.950 3.030 3.075 3.105 3.131 3.1775 3.2085 3.232 3.280 3.312 3.333 3.3825 3.4155 3.535 3.587 3.622 3.636 3.690 3.726 3.838 3.895 3.933 4.04 4.1 4.14 Unit V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V
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Symbol VO
Parameter Output Voltage VI = 5.7V
Test Conditions IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125C
Min. 4.653 4.582 4.5355 4.95 4.875
Typ. 4.7
Max. 4.747 4.817 4.8645
Unit V V V V V V mA %/VI %/VI mV mV mV mV mV mV mV mV mV mV A A A A A A A A A A A A dB
VO
Output Voltage
VI = 6.0V IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125C
5
5.05 5.125 5.175
4.825 400 0.003
ISC
Short Circuit Current
RL = 0 VI = VO+1V to 16V, IO = 1mA VI = VO+1V to 16V, IO = 1mA TJ= -40 to 125C
VO/VI Line Regulation
0.014 0.032
Vd
Dropout Voltage
IO = 0 IO = 0 IO = 1mA IO = 1mA IO = 10mA IO = 10mA IO = 50mA IO = 50mA IO = 150mA IO = 150mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C
1 7 40 120 280 80 TJ= -40 to 125C 100 TJ= -40 to 125C 200 TJ= -40 to 125C 600 TJ= -40 to 125C 2000 0
3 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 2
Id
Quiescent Current
IO = 0 IO = 0 IO = 1mA IO = 1mA IO = 10mA IO = 10mA IO = 50mA IO = 50mA IO = 150mA IO = 150mA TJ= -40 to 125C OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ= -40 to 125C
SVR VIL VIH IiNH eN
Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current
CBYP = 0.01FCO = 10F f = 1KHz TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C VSHDN = 5V VSHDN = 0V 2
45 0.15
V V A A V
5 0 30
15 -1
Output Noise Voltage
B= 300Hz to 50KHz CO = 10F CBYP = 0.01F
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LD2985 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2985B (TJ = 25C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1F, CO = 1F, unless otherwise specified)
Symbol VOp VO Parameter Operating Input Voltage Output Voltage VI = 2.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 2.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 3.85V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.0V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.1V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.2V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.3V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.5V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.6V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 4.8V IO = 1 to 150mA IO = 1 to 150mA VO Output Voltage VI = 5.0V IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C Test Conditions Min. 2.5 1.477 1.455 1.440 1.773 1.746 1.728 2.4625 2.425 2.4 2.758 2.716 2.688 2.807 2.764 2.736 2.955 2.91 2.88 3.0535 3.007 2.976 3.152 3.104 3.072 3.2505 3.201 3.168 3.447 3.395 3.360 3.546 3.492 3.456 3.743 3.686 3.648 3.94 3.88 3.84 4 3.8 3.6 3.5 3.3 3.2 3.1 3.0 2.85 2.8 2.5 1.8 1.5 Typ. Max. 16 1.523 1.545 1.560 1.827 1.854 1.872 2.5375 2.575 2.6 2.842 2.884 2.912 2.893 2.935 2.964 3.045 3.09 3.12 3.1465 3.193 3.224 3.248 3.296 3.328 3.3495 3.399 3.432 3.552 3.605 3.640 3.654 3.708 3.744 3.857 3.914 3.952 4.06 4.12 4.16 Unit V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V
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LD2985 SERIES
Symbol VO
Parameter Output Voltage VI = 5.7V
Test Conditions IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125C
Min. 4.6295 4.559 4.512 4.925 4.85
Typ. 4.7
Max. 4.7705 4.841 4.888
Unit V V V V V V mA %/VI %/VI mV mV mV mV mV mV mV mV mV mV A A A A A A A A A A A A dB
VO
Output Voltage
VI = 6.0V IO = 1 to 150mA IO = 1 to 150mA TJ= -40 to 125C IO = 1mA IO = 1mA
5
5.075 5.15 5.2
4.8 400 0.003
ISC
Short Circuit Current
RL = 0 VI = VO+1V to 16V, VI = VO+1V to 16V, TJ= -40 to 125C
VO/VI Line Regulation
0.014 0.032
Vd
Dropout Voltage
IO = 0 IO = 0 IO = 1mA IO = 1mA IO = 10mA IO = 10mA IO = 50mA IO = 50mA IO = 150mA IO = 150mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C
1 7 40 120 280 80 TJ= -40 to 125C 100 TJ= -40 to 125C 200 TJ= -40 to 125C 600 TJ= -40 to 125C 2000 0
3 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 2
Id
Quiescent Current
IO = 0 IO = 0 IO = 1mA IO = 1mA IO = 10mA IO = 10mA IO = 50mA IO = 50mA IO = 150mA IO = 150mA TJ= -40 to 125C OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ= -40 to 125C
SVR VIL VIH IiNH eN
Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current
CBYP = 0.01FCO = 10F f = 1KHz TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C VSHDN = 5V VSHDN = 0V 2
45 0.15
V V A A V
5 0 30
15 -1
Output Noise Voltage
B= 300Hz to 50KHz CO = 10F CBYP = 0.01F
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LD2985 SERIES
TYPICAL CHARACTERISTICS (unless otherwise specified TJ = 25C, CI=1F, CO=2.2F, CBYP=100nF) Figure 1 : Output Voltage vs Temperature Figure 4 : Quiescent Current vs Load Current
Figure 2 : Dropout Voltage vs Temperature
Figure 5 : Quiescent Current vs Temperature
Figure 3 : Dropout Voltage vs Output Current
Figure 6 : Supply Voltage Rejection vs Temperature
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LD2985 SERIES
Figure 7 : Supply Voltage Rejection vs Output Current Figure 10 : Supply Voltage Rejection vs Frequency
Figure 8 : Supply Voltage Rejection vs Output Current
Figure 11 : Line Transient
VO=2.5V, IO= 50mA, no CI, CO=4.7F, tr=tf=2ns
Figure 9 : Supply Voltage Rejection vs Frequency
Figure 12 : Line Transient
VO=2.5V, IO= 50mA, no CI, CO=4.7F, tr=tf=1s
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LD2985 SERIES
Figure 13 : Load Transient Figure 14 : Load Transient
VO=2.5V, IO=0 to 50mA, no CI, CO=10F, ts=tf=2ns
VO=2.5V, IO=0 to 50mA, no CI, CO=4.7F, ts=tf=2ns
EXTERNAL CAPACITORS Like any low-dropout regulator, the LD2985 requires external capacitors for regulator stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We suggest to solder input and output capacitors as close as possible to the relative pins. INPUT CAPACITOR An input capacitor whose value is 1F is required with the LD2985 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. OUTPUT CAPACITOR The LD2985 is designed specifically to work with ceramic output capacitors. It may also be possible to use Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low E.S.R. ceramic type is used, is 1F for output voltages equal or major than 3.8V, 2.2F for VO going from 1.8 to 3.3V, and 3.3F for the other versions. However, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor. IMPORTANT: The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount of capacitance is provided at all times. This capacitor should be located not more than 0.5" from the output pin of the device and returned to a clean analog ground. INHIBIT INPUT OPERATION The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current consumption down to less than 1A. When the inhibit feature is not used, this pin must be tied to VI to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH VIL. Any slew rate can be used to drive the inhibit.
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LD2985 SERIES
REVERSE CURRENT The power transistor used in the LD2985 has not an inherent diode connected between the regulator input and output. If the output is forced above the input, no current will flow from the output to the input across the series pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND across the two feedback resistors. This current typical value is 160A. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 K and 51.150 K. Figure 15 : Reverse Current Test Circuit
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LD2985 SERIES
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
.
7049676C
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LD2985 SERIES
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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LD2985 SERIES
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. Specifications 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. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2003 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com
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