SGS Thomson Microelectronics LDO-512 Datasheet
LDO_512
IP Library: Ultra Low Nois e, High PSRR, Low Power,
30mA Very Low Dropout Voltage Regulators
PRODUCT PREVIEW
■
RF REGULATOR
■
VERY LOW DROPOUT VOLTAGE : 30mV
■
ULT RA LOW OUTPUT VOLTAGE NOISE
■
HIGH PSRR : 70dB
■
LOW STAND-BY CURRENT : 20µA
■
LOW QUIESCENT CURRENT : 150µA FULL
LOAD
■
NO CURRENT IN POWER DOWN MODE
■
SHORT CIRCUIT PROTECTION
■
SMALL DECOUPLING CERAMIC CAPACITOR
■
BIPOLAR INPUT STAGE
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
Figure 2 :
Typical Application Circuit
APPLICATION NOTE
An external capacitor (C
equivalent serial resistance (ESR) in the range
0.02 to 0.6Ω is used for regulator stability.
Figure 1 :
PWRDWN
Block Diagram
STDBY
?
?
?
V
LDO_512
REF
= 1µF) with an
OUT
?
OUTIN
V
IN
Power Down Mode
ON
OFF
Stand-by Mode
Stand-by Mode
Active Mode
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without noti ce.
→
→
→
→
PWRDWN
IN
STDBY
?
?
LDO_512
?
OUT
?
GND
?
1µF
ESR
V
C
OUT
OUT
1/6June 2002
LDO_512
ELECTRICAL CHARACTERISTICS
3V < V
100µA < I
Typical case : V
< 5.5V, -30°C < TA < +85°C, V
IN
LOAD
< 30mA.
= 4V, T = 25°C, I
IN
REF
= 15mA.
OUT
= 2.8V, 0.8µF < C
< 1.2µF, 20mΩ < ESR < 0.6Ω.
OUT
Parameter Symbol Test Condition Min. Typ. Max. Unit
Input Voltage Range (Note 1) V
Output Voltage V
Output current I
PMOS Output Resistance R
Input Current I
Dropout Voltage ∆V
IN
OUT
OUT
ON
IN
DOILOAD
∆V
= 30mA,
= 50mV
OUT
3 5.5 V
2.8 V
30 mA
0.4 Ω
200 600 nA
30 mV
(Note 2) 170
Quiescent current I
Stand-by current I
STDBYILOAD
Power down mode quiescent current I
PDN
I
Q
= 100µA 100 150 µA
LOAD
= 30mA 150 280
I
LOAD
= 100µA 20 30 µA
Power down active 0.1 µA
Power Supply Rejection Ratio PSRR f < 100KHz 55 70 dB
Power Supply Rejection Ratio in
PSRR
stand-by mode
Load Regulation L
Line Regulation L
Line Transcient L
Load Transcient L
IRT
DTR
f < 100kHz 60 65 dB
STY
DR
IR
I
= 30mA,
LOAD
= 3V to 5.1V,
V
IN
V
= 2.8V
OUT
V
= 2.8V,
OUT
I
= 30mA,
OUT
= 300mV
∆V
IN
= t
t
RISE
FALL
V
= 2.8V,
OUT
t
= t
RISE
FALL
100µA < I
= 10µs
= 10µs
LOAD
< 30mA
10 12 mV
0.5 1 mV
0.5 1.5 mV
3mV
Recovery time 10 20 µs
Output Voltage Noise en 100Hz < f
1KHz < f
1KHz 30 70
≤
100KHz 20 35
≤
f > 100KHz 20 30
Output Decoupling Capacitor C
Settling Time (from power down to active
mode)
Short Circuit Current Limit I
OUT
SHORT
V
C
OUT
OUT
= 2.8V,
= 1µF
1µF
20 50 µs
200 mA
nV
----------- Hz
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.
2/6
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