ETC LDO_517

LDO_517
IP Library: Wide Range ESR Capacitor, Low Noise,
100mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
■ AnyESR REGULATOR
■ VERY COMMON OUTPUT DECOUPLING
CERAMIC CAPACITOR
■
■
■
■
■
■
■
LOW CONSUMPTION : 250µA FULL LOAD
APPLICATION NOTE
An external capacitor (COUT = 1µF) with an
equivalent serial resistance (ESR) up to 1Ω is
used for regulator stability.
Figure 1 : Block Diagram
VERY LOW NOISE : 30µV
VERY LOW DROPOUT VOLTAGE : 50mV
HIGH PSRR : 60dB
STANDBY AND POWER DOWN MODE
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_517
– 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_517
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_517
ELECTRICAL CHARACTERISTICS
3V < VIN < 5.5V, -30°C < TA < +125°C, COUT = 1µF ±20%, ESR < 1Ω, ILOAD = 100mA.
Typical case : VIN = 4V, T = 25°C, COUT = 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
IQ
Max.
Unit
5.5
V
2.8
V
3
%
∆VOUT = 50mV,
ILOAD = 100mA
(Note 2)
Quiescent current
Typ.
100
mA
50
mV
µA
170
ILOAD = 100µA
50
65
ILOAD = 100mA
250
450
100
nA
dB
Power down mode quiescent
current
IQPDM
Power down active
Power Supply Rejection Ratio
PSRR
DC ; Dropout = 170mV
45
55
10KHz < f < 100KHz
45
55
DC ; Dropout = 200mV
55
60
10KHz < f < 100KHz
50
60
Line Regulation
LIR
ILOAD = 100mA,
VIN = 3V to 5.5V
5
15
mV
Load Regulation
LDR
ILOAD = 100µA - 100mA
15
20
mV
Line Transient
LIRT
∆VIN = 300mV
3
mV
3
mV
tRISE = tFALL = 10µs
Load Transient
LDTR
ILOAD = 100µA - 100mA
in 10µs
Output Noise Voltage (Note 3)
en
enRMS
Output decoupling Capacitor
80
1KHz - 10KHz
70
100KHz
85
BW : 100Hz to 100KHz
ILOAD = 100mA
ISHORT
nV
-----------Hz
30
COUT
Settling time
Short Circuit Current Limit
100Hz
200
µVRMS
1
µF
20
µs
400
800
mA
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.
3. Output Noise density reaches its maximum at 1MHz (300nV / H z typical).
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LDO_517
ELECTRICAL CHARACTERISTICS : (STAND-BY MODE)
3V < VIN < 5.5V, -30°C < TA < +125°C, COUT = 1µF ±20%, ESR < 1Ω, ILOAD = 500µA.
Typical case : VIN = 4V, Ambient temperature, ILOAD = 500µA.
Parameter
Symbol
Output current in stand-by
mode
Test Condition
Min.
Typ.
IOUTSTDBY
Quiescent Current in
stand-by mode
ISTDBY
Power Supply Rejection Ratio
in stand-by mode
PSRRSTY
ILOAD = 500µA
15
DC ; Dropout > 1V
65
f = 10KHz
65
f = 100KHz
45
Max.
Unit
500
µA
20
µA
dB
Line Regulation in stand-by
mode
LIRSTBY
VIN = 3V to 5.5V
2
mV
Load Regulation in stand-by
mode
LDRSTBY
ILOAD = 100µA - 500µA
1
mV
TYPICAL CHARACTERISTICS
Figure 3 : PSRR vs Dropout for Various Frequency (VOUT = 2.8V, Full Load)
-50
PSRR (dB)
-55
F=100KHz
-60
F=10KHz
-65
0.1
1
DROPOUT VOLATAGE (mV)
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LDO_517
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
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