ip library: ultra low noise, low power, 100ma low dropout voltage

ip library: ultra low noise, low power, 100ma low dropout voltage
LDO_58
IP Library: Ultra Low Noise, Low power,
100mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
■ RF REGULATOR
■ ULTRA LOW OUTPUT NOISE
APPLICATION NOTE
An external capacitor (COUT = 1µF) with an
equivalent serial resistance (ESR) in the range
0.02 to 0.6Ω is used for regulator stability.
■ HIGH OUTPUT CURRENT : 100mA
Figure 1 : Block Diagram
■ VERY LOW DROPOUT VOLTAGE : 50mV
■ LOW QUIESCENT CURRENT : 110µA
■ HIGH PSRR : 65dB
IN
?
PWRDWN
?
STDBY
?
? OUT
■ NO CURRENT IN POWER DOWN MODE
■ SHORT CIRCUIT PROTECTION
TYPICAL APPLICATIONS
– Cellular and Cordless phones supplied by 1 cell
Lithium-ion battery / 3 cells Ni-MH or Ni-Cd
battery.
VREF
– PDA (Personal Digital Assistant), Smart phone.
– Portable equipment.
LDO_58
– Supply for RF devices for cellular phone.
Figure 2 : Typical Application Circuit
IN
VIN
Power Down Mode
ON
OFF
PWRDWN
?
Stand-by Mode →
→
Active Mode
OUT
VOUT
1µF
?
→
→
Stand-by Mode
?
COUT
LDO_58
ESR
STDBY
?
?
GND
June 2002
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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LDO_58
ELECTRICAL CHARACTERISTICS
3V < VIN < 5.5V, -30°C < TA < +85°C, VREF = 2.8V, C OUT = 1µF ±20%, 20mΩ < ESR < 0.6Ω,
ILOAD = 100mA.
Typical case : VIN = 4V, T = 25°C, C OUT = 1µF.
Parameter
Input Voltage Range (Note 1)
Output Voltage
Symbol
Test Condition
VIN
Min
3
VOUT
Output Voltage Accuracy
Output current
IOUT
Dropout Voltage
∆VDO
Typ
Max
Unit
5,5
V
2,8
V
3
%
∆VOUT = 50mV,
100
mA
50
mV
µA
ILOAD = 100mA
(Note 2)
Quiescent current
IQ
170
ILOAD = 100µA
50
70
ILOAD = 100mA
110
250
40
Quiescent Current in stand-by
mode
ISTDBY
ILOAD = 100µA
20
Power down mode quiescent
current
IQPDM
Power down active
100
nA
Power Supply Rejection Ratio
PSRR
DC
45
65
dB
f = 10KHz
45
60
f = 100KHz
35
45
Line Regulation
Lir
I LOAD = 100mA,
0,5
1
mV
VIN = 3V to 5.5V
Load Regulation
Ldr
I LOAD = 100µA - 100mA
25
40
mV
Line Transient
Lirt
∆VIN = 300mV
tRISE = tFALL=10µs
0,5
1,5
mV
Load Transient
Ldtr
I LOAD = 100µA - 100mA in 10µs
3
10
mV
100Hz
40
65
1KHz - 10KHz
30
40
nV
-----------Hz
BW : 10Hz to 100KHz
25
30
µVRMS
Output Noise Voltage
en
enRMS
Output decoupling Capacitor
COUT
Settling time
Short Circuit Current Limit
From power down to active
mode
ISHORT
µF
1
20
50
µs
200
mA
Notes: 1. Above characteristics are given for 2.9V minimum input operating range voltage, but regulator
is operational with 2.7V minimum input voltage.
2. All parameters are guaranteed with 170mV min dropout voltage.
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LDO_58
TYPCIAL CHARACTERISTICS
Figure 7 : PSRR vs Frequency for Various
Voltage Drop (ILOAD = 100mA)
-35
PSRR (dB)
-45
150m V
170m V
-55
200m V
2V
-65
1
10
100
1000
10000
100000
1000000
FREQUENCY (Hz)
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LDO_58
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
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco
Singapore - Spain - Sweden - Switzerland - United Kingdom - United States
http://www.st.com
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