SGS Thomson Microelectronics LDO-518 Datasheet
1/4June 2002
■
ULTRA LOW POWER REGULATOR
■
ULTRA LOW CONSUMPTION : 45µA FULL
LOAD
■
VERY LOW NOISE : 30µV
■
VERY LOW DROPOUT VOLTAGE : 50mV
■
HIGH PSRR : 60dB
■
SMALL DECOUPLING CERAMIC CAPA CITOR
■
NO CURRENT IN POWER DOWN MODE
■
SHORT CIRCUIT PROTECTION
TYPICAL APPLICATIONS
– Cellular and Cordless phones suppli ed by 1 cell
Lithium-ion battery / 3 cells Ni-MH or Ni-Cd
battery
– PDA (Personal Digital Assistant)
– Smart phone
– Portable equipm ent
– Supply for RF devices for cellular phone
APPLICATION NOTE
An external capacitor (C
OUT
= 2.2µF) with an
equivalent serial resistance (ESR) in the range of
0.02 to 0.6Ω is used for regulator stability.
Figure 1 :
Block Diagram
?
V
REF
?
?
?
LDO_518
OUTIN
PWRDWN
STDBY
Figure 2 :
Typical Application Circuit
2.2µF
ESR
V
OUT
C
OUT
?
?
OUT
GND
?
?
?
V
IN
IN
PWRDWN
Power Down Mode
OFF
ON
Stand-by Mode
STDBY
Active Mode
LDO_518
→
→
Stand-by Mode
→
→
LDO_518
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: Low Noise, High PSRR
100mA Low Dropout Volt age Regulator
LDO_518
2/4
ELECTRICAL CHARACTERISTICS
2V < V
IN
< 5V, -55°C < TA < +125°C, C
OUT
= 2.2µF ±20%, 20 mΩ < ESR < 0. 6Ω, I
LOAD
= 100mA.
Typical case : V
IN
= 4V, T = 25°C, C
OUT
= 2.2µF.
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.
Parameter Symbol Test Condition Min. Typ. Max. Unit
Input Voltage Range (Note 1) V
IN
25V
Output Voltage V
OUT
1.8 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
= 100µA 25 µA
I
LOAD
= 1mA 25
I
LOAD
= 10mA 30
I
LOAD
= 50mA 35
I
LOAD
=100mA 45 50
Power down mode quiescent
current
I
QPDM
Power down active 100 nA
Power Supply Rejection Ratio PSRR ∆V
DO
= 170mV ;
f < 1KHz
45 50 dB
f < 10KHz 35 40
∆V
DO
= 500mV;
f < 100Hz
60 65
f < 1KHz 55 60
f < 10KHz 40 45
Line Regulation L
IR
I
LOAD
= 100mA,
VIN = 2V to 5V
0.5 1 mV
Load Regulation L
DR
I
LOAD
= 100µA - 100mA 15 20 mV
Line Transient L
IRT
∆V
IN
= 300mV
t
RISE
= t
FALL
= 10µs
610mV
Load Transient L
DTR
I
LOAD
= 100µA - 100mA
in 10µs
750mV
Output Noise Voltage en 100Hz 140
1KHz 75
10KHz 70
en
RMS
BW : 100Hz to 100KHz 40 µV
RMS
Settling time I
LOAD
= 100mA 35 µs
nV
Hz
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