UTC-IC UTCLD3870

UTC LD3870
LINEAR INTEGRATED CIRCUIT
LOW DROPOUT VOLTAGE
REGULATOR
DESCRIPTION
The UTC LD3870 is low dropout voltage regulator
designed for cellular phone application.
1
2
3
FEATURES
* High Ripple Rejection: 56dB≤RR(DC<f<60kHz)
66dB typ. (f=100Hz)
60dB typ. (f=1kHz)
* Output Noise Voltage: Vno=30ΜV , Cp=0.01μF
* Output Current: Io(max)=150mA
* High Precision Output: Vo±2%
* Low Dropout Voltage: △Vl-o=0.12V typ.
(Io=60mA,Vo≥1.8V)
* Input Voltage range: +2~+14V(Vo=1.5V Version)
* ON/OFF Control: Active High
* Output capacitor with 4.7uF ceramic capacitor
* Internal Short Circuit Current Limit
* Internal Thermal Overload Protection
5
4
SOT-25
1:CONTROL(Active High)
3:NOISE BYPASS
4:VOUT
2:GND
5: VIN
MARKING INFORMATION
PART
NUMBER
VOLTAGE
VOLATGE
CODE
PART
NUMBER
VOLTAGE
VOLATGE
CODE
LD3870-1.5V
LD3870-1.8V
LD3870-1.9V
LD3870-2.0V
LD3870-2.1V
LD3870-2.3V
LD3870-2.4V
LD3870-2.5V
LD3870-2.6V
LD3870-2.7V
LD3870-2.8V
LD3870-2.85V
LD3870-2.9V
LD3870-3.0V
1.5V
1.8V
1.9V
2.0V
2.1V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.85V
2.9V
3.0V
15
18
19
20
21
23
24
25
26
27
28
2J
29
30
LD3870-3.1V
LD370-3.2V
LD3870-3.3V
LD3870-3.4V
LD3870-3.5V
LD3870-3.6V
LD3870-3.8V
LD3870-4.0V
LD3870-4.5V
LD3870-4.6V
LD3870-4.7V
LD3870-4.8V
LD3870-5.0V
3.1V
3.2V
3.3V
3.4V
3.5V
3.6V
3.8V
4.0V
4.5V
4.6V
4.7V
4.8V
5.0V
31
32
33
34
35
36
38
40
45
46
47
48
50
UTC UNISONIC
TECHNOLOGIES
MARKING
3
2
1
MB
4
VOLTAGE
CODE
5
CO., LTD.
1
QW-R102-027,B
UTC LD3870
LINEAR INTEGRATED CIRCUIT
BLOCK DAGRAM
VIN
VOUT
Cont
Thermal
Protection
Noise
Bypass
+
-
Bandgap
Reference
GND
ABSOLUTE MAXIMUM RATINGS (Ta=25℃)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
+14
V
Control Voltage
VCONT
+14(Note 1)
V
Power Dissipation
PD
200
mW
℃
Operating Temperature
Topr
-40 ~ +85
℃
Storage Temperature
Tstg
-40 ~ +125
Note 1: When input voltage is less than +14V,the absolute maximum control voltage is equal to the input voltage.
ELECTRICAL CHARACTERISTICS (VIN=Vo+1V, CIN=0.1μF, Co=4.7μF, Cp=0.01μF, Ta=25℃)
PARAMETER
SYMBOL
Vo
IQ
TEST CONDITONS
Output Voltage
Quiescent Current
Quiescent Current
At Control OFF
Output Current
Line Regulation
Io
Vo-0.3V
△Vo/△VIN VIN=Vo+1V ~ Vo+6V, Io=30mA
Load Regulation
△Vo/△Io Io=0 ~ 100mA
IQ(OFF)
Io=30mA
Io=0mA, expect lcont
VCONT=0V
MIN.
TYP.
MAX.
UNIT
200
+2%
300
V
μA
100
nA
0.10
mA
%/V
0.03
%/mA
-2%
150
200
△VI-o
Io=60mA
0.12
0.2
V
ein=200mVrms, f=1kHz, Io=10mA,
RR
60
dB
VIN=Vo+2V,
Vo=3V Version
Ta=0~85℃, Io=10mA,
Average Temperature
△Vo/△Ta
mV/℃
0.2
Coefficient of Output Voltage
Vo=3V Version
Output Noise Voltage
f=10Hz ~ 80kHz, Io=10mA,
μVrms
VNO
30
Vo=3V Version
Control Voltage for ON-state
VCONT(ON)
1.6
V
Control Voltage for OFF-state VCONT(OFF)
0.6
V
Note 2: The above specification is a common specification for all output voltages.Therefore, it may be different from
the individual specification for a specific output voltage.
Dropout Voltage
Ripple Rejection
UTC UNISONIC
TECHNOLOGIES
CO., LTD.
2
QW-R102-027,B
UTC LD3870
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS
(Vo=1.5V Version, VIN=2.4V, CIN=0.1μF, Co=4.7μF, Cp=0.01μF, Ta=25℃)
PARAMETER
SYMBOL
Output Voltage
Quiescent Current
Quiescent Curretn
At Control OFF
Output Curretn
Line Regulation
Load Regulation
Ripple Rejection
Vo
IQ
MIN.
-2%
Io
Vo-0.3V
△Vo/△VIN VIN=Vo+1V ~ Vo+6V, Io=30mA
△Vo/△Io Io=0 ~ 100mA
ein=200mVrms, f=1kHz, Io=10mA,
RR
VIN=Vo+2V
Ta=0 ~ 85℃, Io=10mA
△Vo/△Ta
150
IQ(OFF)
Average Temperature
Coefficient of Output Voltage
Output Noise Voltage
Control Voltage for ON-state
Control Voltage for OFF-state
TEST CONDITONS
Io=30mA
Io=0mA, expect Icont
VCONT=0V
VNO
f=10Hz ~ 80kHz, Io=10mA
VCONT(ON)
VCONT(OFF)
TYP.
MAX.
UNIT
200
+2%
300
V
μA
100
nA
0.10
0.03
mA
%/V
%/mA
200
64
dB
0.13
mV/℃
15
μVrms
1.6
0.6
V
V
TEST CIRCUIT
A
IIN
VIN
VOUT
+
+
VIN
0.1 μF
A
UTC LD3870
4.7 μF
(tantalum)
V
VOUT
NOISE
BYPASS
CONTROL
ICONT
CP=0.01 μF
GND
V
IOUT
VCONT
TYPICAL APPLICATON
①
In case that ON/OFF Control is not required:
VIN
0.1 μF
UTC LD3870
R
(0~300kΩ)
CONTROL
GND
UTC UNISONIC
VOUT
VOUT
4.7 μF
(ceramic or tantalum)
NOISE
BYPASS
Cp=0.01 μF
TECHNOLOGIES
CO., LTD.
3
QW-R102-027,B
UTC LD3870
LINEAR INTEGRATED CIRCUIT
Connect control terminal to VIN terminal
The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum operating voltage.
For further information, please refer to Figure ”Output Voltage vs. Control Voltage”.
②
In use of ON/OFF CONTROL:
VIN
VIN
VOUT
VOUT
0.1 μF
UTC LD3870
4.7 μF
(ceramic or tantalum)
R
NOISE
BYPASS
GND
CONTROL
Cp=0.01 μF
State of control terminal:
* ”H” Æ Output is enables.
* ”L”or “open” Æ Output is disabled.
* Noise bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by hand-gap reference circuit.
Noise level and ripple rejection will be improved when larger Cp is used.
Use of smaller Cp value may cause oscillation.
Use the Cp value of 0.01uF greater to avoid the problem.
UTC UNISONIC
TECHNOLOGIES
CO., LTD.
4
QW-R102-027,B
UTC LD3870
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
LD3870-3.0V
Output Voltage vs.Input Voltage
LD3870-3.0V
Output Voltage vs.Output current
4
@:Ta=25℃
Co=4.7 μF(tantalum)
Cp=0.01 μ F
3.1
Io=0A
3
2.9
Io=30mA
2.8
Io=100mA
2.7
2.7
2.8
@:Ta=25℃
VIN=4V
CL=4.7 μF(tantalum)
Cp=0.01 μ F
3.5
Outputput Voltage, Vo (V)
Outputput Voltage, Vo (V)
3.2
3
2.5
2
1.5
1
0.5
2.9
3
3.1 3.2
Input Voltage, VIN (V)
0
3.4
3.3
0
LD3870-3.0V
Ground Pin Current vs.Output Current
0.3
@:Ta=25℃
VIN=4V
CL=4.7 μF(tantalum)
Cp=0.01 μ F
@:Ta=25℃
CL=4.7 μF(tantalum)
Cp=0.01 μ F
0.25
Dropout Voltage, dVI-0 (V)
15
10
5
0.2
0.15
0.1
0.05
0
0
50
100
0
200
150
0
50
LD3870-3.0V
Control Current vs. Control Voltage
4
@:Ta=25℃
VIN=4V
CL=4.7 μF(tantalum)
Cp=0.01 μ F
Io=30mA
Rc=0Ω
30
Rc=50kΩ
20
10
0
Rc=100kΩ
0
0.5
@: VIN=4V
Ta=25 ℃
CL=4.7 μF
Cp=0.01 μF
Io=30mA
3.5
Outputput Voltage, Vo (V)
40
1
1.5 2
2.5 3
Control Voltage, Vcont (V)
UTC UNISONIC
200
150
LD3870-3.0V
Output Voltage vs.Control Voltage
60
50
100
Output current, Io (mA)
Output current, Io (mA)
Control Current, Icont (µA)
300
LD3870-3.0V
Output Voltage vs.Output current
20
Ground Pin Current, IGND (mA)
200
250
100
150
Output current, Io (mA)
50
3.5
3
2.5
Rc=0Ω
2
Rc=50kΩ
1.5
Rc=100kΩ
1
0.5
4
0
0
0.5
1
1.5
2
2.5
3
Control Voltage, Vcont (V)
TECHNOLOGIES
CO., LTD.
5
QW-R102-027,B
UTC LD3870
LD3870-3.0V
Output Noise Voltage vs.Noise Bypass Capacitor
@:Ta=25℃
VIN=4V
Io=10mA
250
200
CL=1μF(Ceramic)
150
100
CL=4.7μF(Ceramic)
50
0
1p
10p
100p
0.01u
1000p
Noise Bypass Capacitor, Cp (F)
100
Output Noise Voltage, Vn (µVrms)
Output Noise Voltage, Vn (µVrms)
300
LINEAR INTEGRATED CIRCUIT
LD3870-3.0V
Output Noise Voltage vs.Noise Output Current
@:Ta=25℃
VIN=4V
Cp=0.01 μF
80
60
CL=1μ F(Ceramic)
40
20
CL=2.2μF(Ceramic)
0
0.001
0.1u
80
80
Ripple Rejection, RR (dB)
Io=10mA
Io=0mA
Ripple Rejection, RR (dB)
100
LD3870-3.0V
Ripple Rejection vs.Output Current
LD3870-3.0V
Ripple Rejection vs.Frequency
70
Io=30mA
60
50
@:Ta=25℃
VIN=4V
ein=200mVrms
CL=1 μF
Cp=0.01μF
40
30
10
100
10K
1K
Frequency, f (Hz)
70
f=1KHz
60
40
30
100K
f=10KHz
50
@:Ta=25℃
VIN=5V
ein=200mVrms
CL=1 μF
Cp=0.01μF
0.001
10
0.01
0.1
1
Output Current, Io (mA)
100
LD3870-3.0V
Equivalent Serise Resistance vs.Output Current
100
Equivalent Serise Resistance, ESR ( Ω)
0.01
0.1
1
10
Output Current, Io (mA)
@:Ta=25℃
VIN=4V
CL=1μ F(Ceramic)
Cp=0.01μ F
10
Oscillation Free
1
0.1
0.02
10
10µ
1m
10m
100µ
Output Current, Io (mA)
UTC UNISONIC
100m
TECHNOLOGIES
CO., LTD.
6
QW-R102-027,B
UTC LD3870
LINEAR INTEGRATED CIRCUIT
LD3870-3.0V
Dropout Voltage vs.Temperature
2
0.3
Dropout Voltage, dV I-0 (V)
Control Voltage, V CONT(OFF) (V)
@:VIN=4V
Output is open
CL=4.7 μ F(tantalum)
Cp=0.01 μ F
0.25
0.2
0.15
0.1
0.05
0
-50
0
50
100
Temperature, Ta ( ℃)
0.5
@:VIN=4V
Output is open
CL=4.7 μF(tantalum)
Cp=0.01 μ F
2.5
2
1.5
1
0.5
100
Temperature, Ta ( ℃)
150
150
200
150
100
50
50
50
100
Temperature, Ta ( ℃)
250
3
0
0
300
@: VIN=4V
Io=30mA
C J =4.7μF(tantalum)
Cp=0.01 μ F
Quiescent Current, I Q (µA)
Outputput Voltage, Vo (V)
1
LD3870-3.0V
Quiescent Current vs.Temperature
4
0
-50
1.5
0
-50
150
LD3870-3.0V
Output Voltage vs.Output current
3.5
LD3870-3.0V
Control Voltage vs.Temperature
200
@:VIN=4V
Output is open
C J =4.7μ F(tantalum)
Cp=0.01 μF
including lcont
0
-50
50
100
0
Temperature, Ta ( ℃)
150
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.
UTC UNISONIC
TECHNOLOGIES
CO., LTD.
7
QW-R102-027,B