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June 2002
s
CHARGE CONTROL REGULATOR
s
VERY LOW DROPOUT VOLTAGE : 60mV
s
LARGE INPUT VOLTAGE RANGE
s
OUTPUT CURRENT : 50mA
s
LOW QUIESCENT CURRENT : 280A
s
HIGH PSRR : 60dB
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 Charge control devices of 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.
The regulator needs two separated power
supplies, one (V
5V
) for the digital parts and
programming inputs (Stand-by and Power-down
mode) which cannot exceed 5V and one (Vin) as
the input voltage of the regulator.
Figure 1 : Block Diagram
?
V
REF
?
?
?
LDO_513
OUT
IN
PWRDWN
STDBY
?
V
5V
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_513
Stand-by Mode
?
5V Power Supply
V
5V
LDO_513
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: Power Supply Range 2.9V to 13V, Low Power,
50mA Low Dropout Voltage Regulator
LDO_513
2/4
ELECTRICAL CHARACTERISTICS
2.9V < V
IN
< 13V, -30C < T
A
< +85C, C
OUT
= 1F 20%, 20m
< ESR < 0.6
, I
LOAD
= 50mA.
Typical case: V
IN
= 4V, T = 25C, C
OUT
= 1F.
Notes: 1. Above characteristics are given for 2.9V minimum input operating range voltage, but regulator
is operational with 2.7V minimum input voltage.
2. All parameters are guaranteed with 200mV min Dropout voltage.
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Input Voltage Range (Note 1)
V
IN
2.9
13
V
Output Voltage
Vout
1.8
5
V
Output Voltage Accuracy
3
%
Output current
I
OUT
50
mA
Dropout Voltage
V
DO
V
OUT
= 50mV,
I
LOAD
= 50mA
70
mV
(Note 2)
200
Quiescent current
I
Q
I
LOAD
= 100A
40
A
I
LOAD
= 10mA
100
I
LOAD
= 50mA
270
340
Power down mode quiescent
current
I
QPDM
Power down active
100
nA
Power Supply Rejection Ratio
PSRR
DC
45
60
dB
f = 10KHz
40
60
Line Regulation
L
IR
I
LOAD
= 50mA,
V
IN
= 3V to 13V
3
mV
Load Regulation
L
DR
I
LOAD
= 100A - 50mA
40
mV
Line Transient
L
IRT
V
IN
= 300mV
t
RISE
= t
FALL
= 10s
3
mV
Load Transient
L
DTR
I
LOAD
=100A - 50mA
in 10s
6
mV
Output Noise Voltage
en
100Hz
1.2
1KHz
400
10KHz
150
100KHz
70
en
RMS
BW : 100Hz to 100KHz
35
V
RMS
Output decoupling Capacitor
C
OUT
1
F
Settling time
From power down to
active mode
120
s
Short Circuit Current Limit
I
SHORT
100
220
mA
V
Hz
------------
nV
H z
------------
LDO_513
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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
500
A
Quiescent Current in stand-by
mode
I
STDBY
I
LOAD
= 500A
20
40
A
Power Supply Rejection Ratio in
stand-by mode
PSRR
STY
f = 10KHz
70
dB
Figure 3 : PSRR vs Frequency for Various Voltage Drop (I
LOAD
= 50mA)
1
10
100
1000
10000
100000
1000000
-60
-50
-40
-30
FREQUENCY (Hz)
PS
R
R
(
d
B
)
170m V
200m V
300m V
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LDO_513
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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