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June 2002
s
CMOS REGULATOR
s
VERY LOW CONSUMPTION : 170A FULL
LOAD
s
VERY LOW DROPOUT VOLTAGE : 50mV
s
HIGH PSRR : 60dB
s
OUTPUT CURRENT : 100mA
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
= 4.7F) 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
?
?
?
LDOC_515
OUT
IN
PWRDWN
STDBY
Figure 2 : Typical Application Circuit
4.7
F
ESR
V
OUT
C
OUT
?
?
OUT
GND
?
?
?
V
IN
IN
PWRDWN
Power Down Mode
OFF
ON
Stand-by Mode
STDBY
Active Mode
LDOC_515
Stand-by Mode
LDOC_515
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: Very Low power, Very High PSRR
100mA Low Dropout Voltage Regulator
LDOC_515
2/4
ELECTRICAL CHARACTERISTICS
3V < V
IN
< 5.5V, -30C < T
A
< +85C, C
OUT
= 4.7F 20%, 20m
< ESR < 0.6
, I
LOAD
= 100mA.
Typical case : V
IN
= 4V, T = 25C, C
OUT
= 4.7F.
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 150mV 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
100
mA
Dropout Voltage
V
DO
V
OUT
= 50mV,
I
LOAD
= 100mA
50
mV
(Note 2)
150
Quiescent current
I
Q
I
LOAD
= 100A
30
40
A
I
LOAD
= 100mA
170
220
Power down mode quiescent
current
I
QPDM
Power down active
100
nA
Power Supply Rejection Ratio
PSRR
DC ; Dropout = 200mV
60
dB
f = 10KHz
40
55
f = 100KHz
35
40
Line Regulation
L
IR
I
LOAD
= 100mA,
V
IN
= 3V to 5.5V
2.5
3.5
mV
Load Regulation
L
DR
I
LOAD
= 100A - 100mA
25
35
mV
Line Transient
L
IRT
V
IN
= 300mV
t
RISE
= t
FALL
= 5s
<1
1.5
mV
Load Transient
L
DTR
I
LOAD
= 100A - 100mA
in 5s
1
2
mV
Output Noise Voltage
en
100Hz
2
1KHz
650
10KHz
250
en
RMS
BW : 100Hz to 100KHz
70
V
RMS
Output decoupling Capacitor
C
OUT
4.7
F
Settling time
I
LOAD
= 100mA
40
120
s
Short Circuit Current Limit
I
SHORT
400
700
mA
V
Hz
------------
nV
Hz
------------
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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.
The ST logo is a registered trademark of STMicroelectronics
2002 STMicroelectronics - All Rights Reserved
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LDOC_515
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