UTC LD1985L-15-AF5-R Very low drop and low noise voltage regulator low esr cap. compatible, with inhibit function Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LD1985
LINEAR INTEGRATED CIRCUIT
VERY LOW DROP AND LOW
NOISE VOLTAGE REGULATOR
LOW ESR CAP. COMPATIBLE,
WITH INHIBIT FUNCTION
3
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 1µA 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 30µVrms.
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 80µA 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 30µVrms
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.
Packing
Tape Reel
LD1985L-xx-AF5-R
(1)Packing Type
(2)Package Type
(1) R: Tape Reel
(2) AF5: SOT-25
(3)Output Voltage Code
(4)Lead Plating
(3) xx: refer to Marking Information
(4) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 10
QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
SOT-25
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
MARKING
3
2
1
Lead Plating
LD
Voltage Code
4
5
PIN DESCRIPTION
PIN NO.
1
2
PIN NAME
VIN
GND
3
INHIBIT
4
Bypass
5
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
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SYMBOL
θJC
RATINGS
81
UNIT
℃/W
2 of 10
QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
V OUT
VIN
CURRENT
LIMIT
SHDN
START-UP
SHUTDOWN
REFERENCE
VOLTAGE
ERROR
AMPLIFIER
DRIVER
BYPASS
TERM. PROTEC.
GND
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3 of 10
QW-R102-021,C
LD1985
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
(Ta=25℃)
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=1µF, COUT=1µF, 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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4 of 10
QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTRISTICS(Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
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℃
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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
5 of 10
QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTRISTICS(Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
VIN=6.0V
Output Voltage
VOUT
IOUT=1 ~ 150mA
IOUT =1 ~ 150mA, TJ=-20 ~ 125℃
Short Circuit Current
Line Regulation
Dropout Voltage
Quiescent Current
Supply Voltage Rejection
Control Input Logic Low
Control Input Logic High
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
Isc
RL=0
VIN =Vo+1V ~ 7V, IOUT =1mA
△Vo/△VI
VIN =Vo+1V ~ 7V, IOUT =1mA, TJ=-20 ~ 125℃
VD
IQ
SVR
VIL
VIH
Control Input Current
IINH
Output Noise Voltage
eN
5.0
400
0.003
IOUT =0
IOUT =0, TJ=-20 ~ 125℃
1
IOUT =1mA
IOUT =1mA, TJ=-20 ~ 125℃
7
IOUT =10mA
IOUT =10mA, TJ=-20 ~ 125℃
40
IOUT =50mA
IOUT =50mA, TJ=-20 ~ 125℃
120
IOUT =150mA
IOUT =150mA, TJ=-20 ~ 125℃
280
IOUT =0
IOUT =0, TJ=-20 ~ 125℃
80
IOUT =1mA
IOUT =1mA, TJ=-20 ~ 125℃
100
IOUT =10mA
IOUT =10mA, TJ=-20 ~ 125℃
200
IOUT =50mA
IOUT =50mA, TJ=-20 ~ 125℃
600
IOUT =150mA
IOUT =150mA, TJ=-20 ~ 125℃
2000
OFF mode VINH<0.18V
OFF mode VINH<0.18V, TJ=-20 ~ 125℃
0
CBYP=0.01µF, Co=10µF, f=1KHz
TJ=-20 ~ 125℃
TJ=-20 ~ 125℃
TJ=-20 ~ 125℃, VSHDN=5V
TJ=-20 ~ 125℃, VSHDN=0V
45
B=300Hz ~ 50KHz, CBYP=0.01µF, Co=10µF
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TYP
2
5
0
30
MAX
5.05
5.075
5.125
5.15
5.175
5.2
UNIT
V
V
V
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
µA
150
µA
150
µA
200
µA
300
µA
400
µA
900
µA
1200
µA
3000
µA
4000
µA
µA
2
µA
dB
0.15
V
V
15
µA
-1
µA
µV
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QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
EXTERNAL CAPACITORS
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 1µF 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 1µF for output voltages equal or major than 3.8V, 2.2µF for VOUT going from 1.8~3.3V, and 3.3µF 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 1µA. 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 160µA. R1 and R2 resistors are implanted type; and
typical values are respectively 42.6 KΩ and 51.15 KΩ.
Bypass
VIN
+
OUT
IN
+
1μF
A
VREV
4.7μF
R1
R2
INH
VIN
GND
1 VINH
2
Fig 1. REVERSE CURRENT TEST CIRCUIT
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QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(TJ=25℃, CIN=1µF, COUT=2.2µF, CBYP=100nF, unless otherwise
specified)
Output Voltage vs Temperature
2.60
Quiescent Current vs Load Current
VIN=3.5V
IOUT=1mA
2.58
V OUT=2.5V
Cby=10nF
2000
2.56
1600
2.52
IQ (μA)
VOUT (V)
2.54
2.50
2.48
1200
800
2.46
2.44
400
2.42
2.40
-50
-25
0
50
25
Tc (℃)
75
100
0
125
0
25
Dropout Voltage vs Temperature
50
100
75
IoUT (mA)
125
150
175
Quiescent Current vs Temperature
0.4
VOUT=2.5V
Cby=10nF
VOUT=2.5V
Cby =10nF
3.5
IOUT=150mA
IOUT=150mA
3.0
0.3
0.2
IQ (mA)
VD (V)
2.5
IOUT=50mA
2.0
1.5
1.0
0.1
IOUT=10mA
0.5
IOUT=1mA
0
-50
-25
0
50
25
Tc (℃)
75
100
0
-50
125
-25
0
25
50
Tc (℃)
75
90
250
fosc=1KHz
VIN=3.5 ~ 6.5V
IoUT=10mA
80
SVR (dB)
200
VD (mV)
125
Supply Voltage Rejection vs Temperature
Dropout Voltage vs Output Current
150
CoUT=10μF
70
CoUT=1μF
60
50
100
40
VOUT=2.5V
50
0
100
30
0
25
50
75
100
125
150
175
IoUT (mA)
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20
-50
-25
0
25
50
75
100
125
Tc (℃)
8 of 10
QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
Supply Voltage Rejection vs Output Current
Supply Voltage Rejection vs Frequency
80
100
70
60
60
SVR (dB)
SVR (dB)
80
40
40
30
20
20
0
50
VIN=3.5 ~ 6.5V
COUT=10μF
fosc=1KHz
0
25
50
10
100
75
IOUT (mA)
150
125
VIN=3.5 ~ 6.5V
IOUT=10mA
VOUT=2.5V
COUT=1μF
0
1
10
175
2
10
f (KHz)
4
10
5
10
Line Transient
Supply Voltage Rejection vs Output Current
100
3
10
Tek Run:5.00MS/s
SVR (dB)
80
60
VIN
1
40
1
20
0
VOUT
VIN=3.5 ~ 6.5V
C OUT=1μF
fosc=1KHz
0
25
50
100
75
150
125
Ch1 500mV Ch2
CH2 20.0mV M 10.0μs Ch1
175
3.96V
V OUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, tr =tf=20ns
IOUT (mA)
Line Transient
Supply Voltage Rejection vs Frequency
70
Tek Run:5.00MS/s
SVR (dB)
60
VIN
50
1
40
30
VOUT
20
10
2
VIN=2.8 ~ 5.8V
IOUT=10mA
VOUT=1.8V
COUT=10μF
0
101
102
103
4
10
5
10
f (KHz)
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CH2 20.0mV M 10.0μs Ch1
Ch1 500mV Ch2
3.96V
VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, tr =tf=1μs
9 of 10
QW-R102-021,C
LD1985
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
Load Transient
Load Transient
Tek Run: 5.00MS/s
Tek Run: 5.00MS/s
2
Iout
2
1
3
Vout
Vout
Ch3 20.0mV
Ch2 50.0mVΩ
M 10.0μs
Ch2
29mV
VOUT=2.5V, IOUT=0~50mA, no CIN, COUT=10μF, ts=tf=2ns
Ch1
50.0mV
Ch2
CH2
100mVΩ M 10.0μs
Ch2
78mV
VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, 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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10 of 10
QW-R102-021,C
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