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UNISONIC TECHNOLOGIES CO., LTD LD1985
VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION
DESCRIPTION
The UTC LD1985 is a 150mA fixed output voltage regulator with ultra low drop voltage and the low quiescent current. It is specially designed for low noise, low power applications and in battery powered systems, such as Cell phones, palmtop laptop computer, PDAs, DSC. The quiescent current in sleep mode is less than 1A when INHIBIT pin is pulled low. Due to Shutdown Logic Control Function is available on pin 3 (TTL compatible), 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 Besides, an external capacitor, CBYP=10nF, connected between bypass pin and GND could reduce the noise to 30Vrms.
LINEAR INTEGRATED CIRCUIT
3
2
1
4
5
SOT-25
*Pb-free plating product number: LD1985L
FEATURES
*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, 5.0V *Internal current and thermal limit * 1% tolerance version is available.(at 25 ) *Low output noise voltage 30Vrms
ORDERING INFORMATION Order Number Package Normal Lead Free Plating LD1985-xx-AF5-R LD1985L-xx-AF5-R SOT-25 Note: xx: Output Voltage, refer to Marking Information.
LD1985L-xx-AF5-R (1)Packing Type (2)Package Type (3)Output Voltage Code (4)Lead Plating (1) R: Tape Reel (2) AF5: SOT-25 (3) xx: refer to Marking Information (4) L: Lead Free Plating, Blank: Pb/Sn
Packing Tape Reel
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MARKING INFORMATION
PACKAGE VOLTAGE CODE 15:1.5V 18:1.8V 25:2.5V 28:2.8V 2J:2.85V 30:3.0V 31:3.1V 32:3.2V 33:3.3V 35:3.5V 36:3.6V 38:3.8V 40:4.0V 47:4.7V 50:5.0V
LINEAR INTEGRATED CIRCUIT
MARKING
3 2 1
Lead Plating
SOT-25
LD
Voltage Code
4
5
PIN DESCRIPTION
PIN NO. 1 2 3 4 5 PIN NAME VIN GND INHIBIT Bypass VOUT FUNCTION Input Ground 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 Pin: Capacitor to be connected to GND in order to improve the thermal noise performances. Output
THERMAL DATA
PARAMETER Thermal Resistance Junction-Case SYMBOL
JC
RATINGS 81
UNIT /W
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BLOCK DIAGRAM
VIN CURRENT LIMIT START-UP SHUTDOWN REFERENCE VOLTAGE ERROR AMPLIFIER
LINEAR INTEGRATED CIRCUIT
VOUT
SHDN
DRIVER
BYPASS
TERM. PROTEC.
GND
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ABSOLUTE MAXIMUM RATINGS
(Ta=25 )
LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL RATINGS UNIT DC Input Voltage VIN 7 V INHIBIT Input Voltage VINH 7 V Output Current IOUT Internally limited Power Dissipation PD Internally limited Operating Junction Temperature TOPR -20~+125 Storage Temperature TSTG -40~+150 Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. The device is guaranteed to meet performance specification within 0 ~+70 operating temperature range and assured by design from -20 ~+125
ELECTRICAL CHARACTRISTICS
(TJ=25 , VIN=VOUT+1V, IOUT=1mA, VSHDN=2V, CIN=1F, COUT=1F, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Operating Input Voltage VIN(OPR) 2.5 7.0 V 1.0% 1.485 1.515 VIN=2.5V 1.5 V 1.5% 1.477 1.523 1.0% 1.462 1.538 IOUT=1 ~ 150mA V Output Voltage VOUT 1.5% 1.455 1.545 1.0% 1.447 1.553 IOUT =1 ~ 150mA, TJ=-20 ~ 125 V 1.5% 1.440 1.560 1.0% 1.782 1.818 VIN=2.8V 1.8 V 1.5% 1.773 1.827 1.0% 1.755 1.845 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 1.746 1.854 1.0% 1.737 1.863 IOUT =1 ~ 150mA, TJ=-20 ~ 125 V 1.5% 1.728 1.872 1.0% 2.475 2.525 VIN=3.5V 2.5 V 1.5% 2.4625 2.5375 1.0% 2.4375 2.5625 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.425 2.575 1.0% 2.4125 2.5875 IOUT =1 ~ 150mA, TJ=-20 ~ 125 V 1.5% 2.4 2.6 1.0% 2.772 2.828 VIN=3.8V 2.8 V 1.5% 2.758 2.842 1.0% 2.730 2.870 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.716 2.884 1.0% 2.702 2.898 IOUT =1 ~ 150mA, TJ=-20 ~ 125 V 1.5% 2.688 2.912 1.0% 2.821 2.879 VIN=3.85V 2.85 V 1.5% 2.807 2.893 1.0% 2.778 2.921 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.764 2.935 1.0% 2.750 2.950 IOUT =1 ~ 150mA, TJ=-20 ~ 125 V 1.5% 2.736 2.964 1.0% 2.970 3.030 VIN=4.0V 3.0 V 1.5% 2.955 3.045 1.0% 2.925 3.075 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.91 3.09 1.0% 2.895 3.105 IOUT =1 ~ 150mA, TJ=-20 ~ 125 V 1.5% 2.88 3.12
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ELECTRICAL CHARACTRISTICS(Cont.)
PARAMETER SYMBOL VIN=4.1V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=4.2V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=4.3V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=4.5V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=4.6V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=4.8V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=5.0V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 VIN=5.7V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5%
MIN 3.069 3.0535 3.022 3.007 2.9915 2.976 3.168 3.152 3.120 3.104 3.088 3.072 3.267 3.2505 3.2175 3.201 3.1845 3.168 3.465 3.447 3.412 3.395 3.377 3.360 3.564 3.546 3.510 3.492 3.474 3.456 3.762 3.743 3.705 3.686 3.667 3.648 3.96 3.94 3.9 3.88 3.86 3.84 4.653 4.6295 4.582 4.559 4.5355 4.512
TYP 3.1
3.2
3.3
3.5
3.6
3.8
4.0
4.7
MAX UNIT 3.131 V 3.1465 3.1775 V 3.193 3.2085 V 3.224 3.232 V 3.248 3.280 V 3.296 3.312 V 3.328 3.333 V 3.3495 3.3825 V 3.399 3.4155 V 3.432 3.535 V 3.552 3.587 V 3.605 3.622 V 3.640 3.636 V 3.654 3.690 V 3.708 3.726 V 3.744 3.838 V 3.857 3.895 V 3.914 3.933 V 3.952 4.04 V 4.06 4.1 V 4.12 4.14 V 4.16 4.747 V 4.7705 4.817 V 4.841 4.8645 V 4.888
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ELECTRICAL CHARACTRISTICS(Cont.)
PARAMETER SYMBOL VIN=6.0V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125 Short Circuit Current Line Regulation Isc Vo/
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS 1.0% 1.5% 1.0% 1.5% 1.0% 1.5%
MIN 4.95 4.925 4.875 4.85 4.825 4.8
TYP 5.0
MAX 5.05 5.075 5.125 5.15 5.175 5.2
UNIT V V V
RL=0 VIN =Vo+1V ~ 7V, IOUT =1mA VI VIN =Vo+1V ~ 7V, IOUT =1mA, TJ=-20 ~ 125 IOUT =0 IOUT =0, TJ=-20 ~ 125 IOUT =1mA IOUT =1mA, TJ=-20 ~ 125
400 0.003 1 7 40 120 280 80 100 200 600 2000 0 45 2 5 0 30
Dropout Voltage
VD
IOUT =10mA IOUT =10mA, TJ=-20 ~ 125 IOUT =50mA IOUT =50mA, TJ=-20 ~ 125 IOUT =150mA IOUT =150mA, TJ=-20 ~ 125 IOUT =0 IOUT =0, TJ=-20 ~ 125 IOUT =1mA IOUT =1mA, TJ=-20 ~ 125
Quiescent Current
IQ
IOUT =10mA IOUT =10mA, TJ=-20 ~ 125 IOUT =50mA IOUT =50mA, TJ=-20 ~ 125 IOUT =150mA IOUT =150mA, TJ=-20 ~ 125 OFF mode VINH<0.18V OFF mode VINH<0.18V, TJ=-20 ~ 125
Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage
SVR VIL VIH IINH eN
CBYP=0.01F, Co=10F, f=1KHz TJ=-20 ~ 125 TJ=-20 ~ 125 TJ=-20 ~ 125 , VSHDN=5V TJ=-20 ~ 125 , VSHDN=0V B=300Hz ~ 50KHz, CBYP=0.01F, Co=10F
mA 0.014 %/VIN 0.032 %/ VIN 3 mV 5 mV 10 mV 15 mV 60 mV 90 mV 150 mV 225 mV 350 mV 575 mV 100 A 150 A 150 A 200 A 300 A 400 A 900 A 1200 A 3000 A 4000 A A 2 A dB 0.15 V V 15 A -1 A V
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APPLICATION INFORMATION
EXTERNAL CAPACITORS
LINEAR INTEGRATED CIRCUIT
An external capacitor for regulator stability is required. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. It is recommended to solder input and output capacitors as close as possible to the relative pins. INPUT CAPACITOR A 1F input capacitor (ceramic, tantalum or film capacitors can be used) is required with the UTC LD1985 (amount of capacitance can be increased without limit). This capacitor must be located a distance less than 0.5" from the input pin of the device and returned to a clean analog ground. OUTPUT CAPACITOR The output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. 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 over time. Due to the different loop gain and the stability improves for higher output versions, if low E.S.R. ceramic type is used, the recommended minimum output capacitor value are is 1F for output voltages equal or major than 3.8V, 2.2F for VOUT going from 1.8~3.3V, and 3.3F for the other versions. However, if an output capacitor lower than the suggestion, it's possible to make stable the regulator adding a resistor in series to the capacitor. 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 VIN to keep the regulator output ON over time. 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. REVERSE CURRENT The power transistor used in the UTC LD1985 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; and typical values are respectively 42.6 K and 51.15 K.
Bypass OUT + R1 A 4.7 F
VIN
+
IN 1F
VREV
R2 INH GND
VIN
1 VINH 2
Fig 1. REVERSE CURRENT TEST CIRCUIT
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specified)
Output Voltage vs Temperature 2.60 2.58 2.56 2.54 VIN=3.5V IOUT=1mA 2000
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(TJ=25 , CIN=1F, COUT=2.2F, CBYP=100nF, unless otherwise
Quiescent Current vs Load Current VOUT=2.5V Cby=10nF
1600
VOUT (V)
2.52
IQ ( A)
2.50 2.48 2.46 2.44 2.42 2.40 -50 -25 0 25 Tc ( 50 ) 75 100 125
1200
800
400
0
0
25
50
100 75 IoUT (mA)
125
150
175
Dropout Voltage vs Temperature 0.4 VOUT=2.5V Cby=10nF 0.3 3.5
Quiescent Current vs Temperature VOUT=2.5V Cby=10nF IOUT=150mA 3.0 2.5
IOUT=150mA
IQ (mA)
VD (V)
0.2
IOUT=50mA
2.0 1.5
0.1 IOUT=10mA IOUT=1mA 0 -50 -25 0 50 25 Tc ( ) 75 100 125
1.0 0.5 0 -50
-25
0
25
50 Tc ( )
75
100
125
Dropout Voltage vs Output Current
Supply Voltage Rejection vs Temperature fosc=1KHz VIN=3.5 ~ 6.5V IoUT=10mA CoUT=10 F
250
90 80
200
VD (mV)
SVR (dB)
70 CoUT=1 F 60 50 40 30 20 -50
150
100 VOUT=2.5V
50
0
0
25
50
75
100
125
150
175
-25
0
25
50
75
100
125
IoUT (mA)
Tc ( )
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TYPICAL CHARACTERISTICS(Cont.)
Supply Voltage Rejection vs Output Current 100 80 70 80 60 50 40 30 20
LINEAR INTEGRATED CIRCUIT
Supply Voltage Rejection vs Frequency
SVR (dB)
40
SVR (dB)
60
20
VIN=3.5 ~ 6.5V COUT=10 F fosc=1KHz
0 25 50 100 75 IOUT (mA) 125 150 175
10
0
0 1 10
VIN=3.5 ~ 6.5V IOUT=10mA VOUT=2.5V COUT=1 F
10
2
10 f (KHz) Line Transient
3
10
4
10
5
100
Supply Voltage Rejection vs Output Current
Tek Run:5.00MS/s
80
SVR (dB)
60 1 40 1 20
VIN
VOUT
VIN=3.5 ~ 6.5V COUT=1 F fosc=1KHz
0 25 50 75 100 125 150 175 Ch1 500mV Ch2 20.0mV M 10.0 s Ch1 CH2 VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7 Line Transient 3.96V F, tr=tf=20ns
0
IOUT (mA) Supply Voltage Rejection vs Frequency
70 60
Tek Run:5.00MS/s
SVR (dB)
50 40 30 1
VIN
VOUT
20 10
0 101
VIN=2.8 ~ 5.8V IOUT=10mA VOUT=1.8V COUT=10 F
102 103 f (KHz) 10
4
2
10
5
CH2 Ch1 500mV Ch2 20.0mV M 10.0 s Ch1
3.96V s
VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7
F, tr=tf=1
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TYPICAL CHARACTERISTICS(Cont.)
Load Transient
LINEAR INTEGRATED CIRCUIT
Load Transient
Tek Run: 5.00MS/s
2
Tek Run: 5.00MS/s
Iout
2
1 3 Vout Vout
Ch3 20.0mV
Ch2 50.0mV
M 10.0 s
Ch2
29mV
Ch1
50.0mV
Ch2 CH2
100mV
M 10.0 s
Ch2
78mV
VOUT=2.5V, IOUT=0~50mA, no CIN, COUT=10 F, ts=tf=2ns
VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7 F, ts=tf=20ns
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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