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June 2002
s
RF REGULATOR
s
VERY LOW DROPOUT VOLTAGE : 50mV
s
VERY LOW CONSUMPTION : 320A FULL
LOAD
s
VERY GOOD TRANSIENT BEHAVIOUR : 1mV
s
OUTPUT CURRENT : 200mA
s
HIGH PSRR : 65dB
s
NO CURRENT IN POWER DOWN MODE
s
SHORT CIRCUIT PROTECTION
TYPICAL APPLICATIONS
Cellular and Cordless phones supplied by 1 cell
Lithium-ion battery / 3 cells Ni-MH or Ni-Cd
battery
PDA (Personal Digital Assistant),
Smart phone
Portable equipment
Supply for RF devices for cellular phone
APPLICATION NOTE
An external capacitor (C
OUT
= 1F) with an
equivalent serial resistance (ESR) in the range
0.02 to 0.6
is used for regulator stability.
Figure 1 : Block Diagram
?
V
REF
?
?
?
LDO_514
OUT
IN
PWRDWN
STDBY
Figure 2 : Typical Application Circuit
1
F
ESR
V
OUT
C
OUT
?
?
OUT
GND
?
?
?
V
IN
IN
PWRDWN
Power Down Mode
OFF
ON
Stand-by Mode
STDBY
Active Mode
LDO_514
Stand-by Mode
LDO_514
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
PRODUCT PREVIEW
IP Library: High PSRR, Very Low power,
200mA Low Dropout Voltage Regulator
LDO_514
2/4
ELECTRICAL CHARACTERISTICS
3V < V
IN
< 5.5V, -55C < T
A
< +125C, C
OUT
= 1F 20%, 20m
< ESR < 0.6
, I
LOAD
= 200mA.
Typical case : V
IN
= 4V, T = 25C, C
OUT
= 1F.
Notes: 1. Above characteristics are given for 3V minimum input operating range voltage, but regulator is
operational with 2.7V minimum input voltage.
2. All parameters are guaranteed with 170mV min Dropout voltage.
Parameter Symbol
Test
Condition
Min.
Typ.
Max.
Unit
Input Voltage Range (Note 1)
V
IN
3
5.5
V
Output Voltage
V
OUT
2.8
V
Output Voltage Accuracy
3
%
Output current
I
OUT
200
mA
Dropout Voltage
V
DO
V
OUT
= 50mV,
I
LOAD
= 200mA
50
mV
(Note 2)
170
Quiescent current
I
Q
I
LOAD
= 100A
70
110
A
I
LOAD
= 20mA
90
130
I
LOAD
= 200mA
320
440
Power down mode quiescent
current
I
QPDM
Power down active
100
nA
Power Supply Rejection Ratio
PSRR
DC
65
dB
f = 10KHz
60
f = 100KHz
50
Line Regulation
L
IR
I
LOAD
= 200mA,
V
IN
= 3V to 5.5V
1.5
2.5
mV
Load Regulation
L
DR
I
LOAD
= 100A - 200mA
35
40
mV
Line Transient
L
IRT
V
IN
= 300mV
t
RISE
= t
FALL
= 10s
<1
mV
Load Transient
L
DTR
I
LOAD
= 100A - 200mA
in 10s
0.5
1
mV
Output Noise Voltage
en
100Hz
1400
1KHz
450
10KHz
150
en
RMS
BW : 100Hz to 100KHz
45
V
RMS
Output decoupling Capacitor
C
OUT
1
F
Settling time
I
LOAD
= 200mA
15
30
s
Short Circuit Current Limit
I
SHORT
800
mA
nV
Hz
------------
LDO_514
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10
60
110
160
210
2710
2720
2730
2740
2750
OUTPUT CURRENT (mA)
O
U
TP
U
T
V
O
LTA
G
E
(
m
V
)
Vin=5.5V
Vin=4.0V
Vin=3.0V
2795
2797
2799
2801
2803
2805
INPUT VOLTAGE (V)
O
U
T
P
UT
VO
L
T
AG
E
(
m
V
)
3.00
3.20
3.40
3.50
3.80
4.00
4.50
5
5.1
Full Load
1
10
100
1000
10000
100000
1000000
10000000
-65
-55
-45
-35
-25
-15
FREQUENCY (Hz)
PS
RR
(
d
B
)
170m V
200m V
2V
150m V
ELECTRICAL CHARACTERISTICS : STAND-BY MODE
3V < V
IN
< 5.5V, -30C < T
A
< +85C, V
REF
= 2.8V, C
OUT
= 4.7F 20%, 20m
< ESR < 0.6
.
I
LOAD
= 500A.
Typical case : V
IN
= 4V, Ambient temperature, I
LOAD
= 500A.
TYPICAL CHARACTERISTICS
Parameter Symbol
Test
Condition
Min.
Typ.
Max.
Unit
Output current in stand-by mode
I
OUTSTDBY
200
A
Quiescent Current in stand-by mode
I
STDBY
I
LOAD
= 500A
15
20
Power Supply Rejection Ratio in
stand-by mode
PSRR
STY
f = 10KHz
55
dB
Line Regulation in stand-by mode
Lir
STBY
V
IN
= 3V to 5.5V
2
mV
Load Regulation in stand-by mode
Ldr
STBY
I
LOAD
= 100A - 500A
1
mV
Figure 3 : PSRR vs Freq for Various Voltage Drop
(V
OUT
= 2.8V, Full Load)
Figure 4 : Output Voltage vs. Input Voltage
(V
OUT
= 2.8V, Full Load)
Figure 5 : Output Voltage vs Output Current (Load Regulation)
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LDO_514
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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.
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