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June 2002
s
AnyESR REGULATOR
s
VERY COMMON OUTPUT DECOUPLING
CERAMIC CAPACITOR
s
LOW CONSUMPTION : 250A FULL LOAD
s
VERY LOW NOISE : 30V
s
VERY LOW DROPOUT VOLTAGE : 50mV
s
HIGH PSRR : 60dB
s
STANDBY AND POWER DOWN MODE
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) up to 1
is
used for regulator stability.
Figure 1 : Block Diagram
?
V
REF
?
?
?
LDO_517
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_517
Stand-by Mode
LDO_517
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: Wide Range ESR Capacitor, Low Noise,
100mA Low Dropout Voltage Regulator
LDO_517
2/4
ELECTRICAL CHARACTERISTICS
3V < V
IN
< 5.5V, -30C < T
A
< +125C, C
OUT
= 1F 20%, ESR < 1
, I
LOAD
= 100mA.
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 2.5V minimum input voltage.
2. All parameters are guaranteed with 170mV min Dropout voltage.
3. Output Noise density reaches its maximum at 1MHz (300nV /
typical).
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
100
mA
Dropout Voltage
V
DO
V
OUT
= 50mV,
I
LOAD
= 100mA
50
mV
(Note 2)
170
Quiescent current
I
Q
I
LOAD
= 100A
50
65
A
I
LOAD
= 100mA
250
450
Power down mode quiescent
current
I
QPDM
Power down active
100
nA
Power Supply Rejection Ratio
PSRR
DC ; Dropout = 170mV
45
55
dB
10KHz < f < 100KHz
45
55
DC ; Dropout = 200mV
55
60
10KHz < f < 100KHz
50
60
Line Regulation
L
IR
I
LOAD
= 100mA,
V
IN
= 3V to 5.5V
5
15
mV
Load Regulation
L
DR
I
LOAD
= 100A - 100mA
15
20
mV
Line Transient
L
IRT
V
IN
= 300mV
t
RISE
= t
FALL
= 10s
3
mV
Load Transient
L
DTR
I
LOAD
= 100A - 100mA
in 10s
3
mV
Output Noise Voltage (Note 3)
en
100Hz
80
1KHz - 10KHz
70
100KHz
85
en
RMS
BW : 100Hz to 100KHz
30
V
RMS
Output decoupling Capacitor
C
OUT
1
F
Settling time
I
LOAD
= 100mA
20
s
Short Circuit Current Limit
I
SHORT
200
400
800
mA
nV
Hz
------------
H z
LDO_517
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ELECTRICAL CHARACTERISTICS : (STAND-BY MODE)
3V < V
IN
< 5.5V, -30C < T
A
< +125C, C
OUT
= 1F 20%, ESR < 1
, 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
500
A
Quiescent Current in
stand-by mode
I
STDBY
I
LOAD
= 500A
15
20
A
Power Supply Rejection Ratio
in stand-by mode
PSRR
STY
DC ; Dropout > 1V
65
dB
f = 10KHz
65
f = 100KHz
45
Line Regulation in stand-by
mode
L
IRSTBY
V
IN
= 3V to 5.5V
2
mV
Load Regulation in stand-by
mode
L
DRSTBY
I
LOAD
= 100A - 500A
1
mV
Figure 3 : PSRR vs Dropout for Various Frequency (V
OUT
= 2.8V, Full Load)
0.1
1
-65
-60
-55
-50
DROPOUT VOLATAGE (mV)
PS
R
R
(
d
B
)
F=100KHz
F=10KHz
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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.
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LDO_517
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