Page 1
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
Page 2
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
Page 3
TYPICAL CHARACTERISTICS
LDO_512
Figure 3 :
PSRR vs Frequency
(Iload max - Vi n min )
75
70
PSRR (dB)
65
60
100 1000 10000 100000
Figure 5 :
FREQUENCY (Hz)
Load Transient (rising egde)
Figure 4 :
Noise vs Frequency
(Iload max - Vin min)
150
100
NOISE (nVrms)
50
0
100 1000 10000 100000
Figure 6 :
FREQUEN CY (Hz)
Load Transient (falling egde)
Figure 7 :
Load Transient in Std-by mode
(rising egde)
Figure 8 :
Load Transient in Std-by mode
(falling egde)
3/6
Page 4
LDO_512
Figure 9 :
2810
2805
2800
2795
OUTPUT VOLTAGE (mV)
2790
3.0 3.5 4.0 4.5 5.1
Figure 11 :
Output Voltage vs Input Voltage
(Line Regulation)
no load
Iload=15mA
Iload=30mA
INPUT VOLTAGE (V)
Line Transient
(rising egde ; Vin min ; Iload max)
Figure 10 :
2813
2812
2811
OUTPUT VOLTAGE (mV)
2810
3.0 3.5 4.0 4.5 5.1
Figure 12 :
Output Voltage vs Input Voltage
(Line Regulation - Stand-by mode)
no load
Iload=100µA
INPUT VOLTAGE (V)
Line Transient
(falling egde ; Vin min ; Iload max)
Figure 13 :
2805
2800
2795
OUTPUT VOLTAGE (mV)
2790
0102030
4/6
Output Voltage vs Output Current
(Load Regulation)
Vin=5.1V
Vin=3.0V
OUTPUT CURRENT (mA)
Figure 14 :
2813
2812
2811
OUTPUT VOLTAGE (mV)
2810
0 20406080100
Output Voltage vs Output Current
(Load Regulation - Stand-by mode)
Vin=5.1V
Vin=3.0V
OUTPUT CURRENT (µA)
Page 5
LDO_512
5/6
Page 6
LDO_512
Information furnished is bel ieved to be accurate and reliable. However, STMicroe lectronics 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 li cense is granted by imp lication or otherwise under a ny patent or patent rig hts of STMicroelectronics. Specificat ions
mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information
previously supplied. S TMicroelectronics products are not authorized for use as critica l components in life suppo rt devices or
systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics - All Rights Reserved
STMicroele ct ronics GROUP OF COM P A NI E S
Australia - Brazil - Canada - China - F i nl and - France - Germany - Hong Kong - Indi a - Israel - Ital y - J apan - Malays i a - M a l ta - Morocco
Singapor e - S pai n - Sweden - Switzerland - U ni ted Kingdom - United States
http://www.st.com
6/6
Loading...