SGS Thomson Microelectronics LDO-52 Datasheet
1/4June 2002
IP Library: Hi gh PSRR, Low Power,
70mA Low Dropout Volt age Regulator
■
DIGITAL BASEBAND REGULATOR
■
VERY LOW DROPOUT VOLTAGE : 50mV
■
HIGH PSRR : 60dB
■
LOW QUIESCENT CURRENT : 150µA
■
1µA STAND-BY MODE CURRENT
■
NO CURRENT IN POWER DOWN MODE
■
SHORT CIRCUIT PROTECTION
■
SMALL DECOUPLING CERAMIC CAPACITOR
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 Digital (Memory , DSP/Microcontr oller)
devices .
APPLICATION NOTE
An external capacitor (C
OUT
= 1µF typical) with an
equivalent serial resistance (ESR) in the range
0.02 to 0.6Ω is used to ensure stability.
Figure 1 :
Block Diagram
?
V
REF
?
?
?
LDO_52
OUTIN
PWRDWN
STDBY
Figure 2 :
Typical Application Circuit
1µF
ESR
V
OUT
C
OUT
?
?
OUT
GND
?
?
?
V
IN
IN
PWRDWN
Power Down Mode
OFF
ON
Stand-by Mode
STDBY
Active Mode
LDO_52
→
→
Stand-by Mode
→
→
LDO_52
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
PRODUCT PREVIEW
LDO_52
2/4
ELECTRICAL CHARACTERISTICS
3V < V
IN
< 5.5V, -30°C < T < +125°C, V
REF
= 2.8V, 0.8µF < C
OUT
< 1.2µF, 20mΩ < ESR < 0.6Ω.
100µA < I
LOAD
< 70mA.
Typical case :
V
IN
= 4V, T = 25°C, I
OUT
= 35mA.
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 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 3 %
Output current I
OUT
Active mode 70 mA
Low power mode 500 µA
P
MOS
Output Resistance R
ON
0,2 Ω
Dropout Voltage ∆V
DO
∆V
OUT
= 50mV,
I
LOAD
= 70mA
60 mV
(Note 2) 170
Quiescent current I
Q
I
LOAD
= 100µA2030µA
I
LOAD
= 70mA 150 170
Stand-by current I
STDBY
I
LOAD
= 500µA510µA
Power down mode quiescent
current
I
QPRWDWN
Power down active 100 1000 nA
Power Supply Rejection Ratio PSRR DC 50 60 dB
f < 10KHz 40 45
Load Regulation Ldr V
OUT
= 2.8V 20 35 mV
Line Regulation Lir I
LOAD
= 70mA,
V
OUT
= 2.8V
23mV
Std-by mode
I
LOAD
= 500µA
10 mV
Line Transient Lirt V
OUT
= 2.8V
I
LOAD
= 70mA,
∆V
IN
= 300mV,
t
RISE
= t
FALL
= 10µs
3mV
Load Transient Ldtr 10% to 90%
and 90% to 10%
of 70mA in 10µs
5mV
Recovery time 5 6 µs
Output decoupling capacitor C
OUT
1 µF
Settling time
(from power down to active mode)
V
OUT
= 2.8V,
C
OUT
= 1µF
20 50 µs
Short Circuit Current Limit I
SHORT
300 800 mA
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