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LDO_59
IP Library: Ultra Low Noise, High PSRR, Low Power, 20mA Low Dropout Voltage Regulator
PRODUCT PREVIEW
s s s s s s s s s
RF REGULATOR VERY LOW DROPOUT VOLTAGE : 60mV ULTRA LOW OUTPUT VOLTAGE NOISE HIGH PSRR : 70dB LOW QUIESCENT CURRENT : 70A FULL LOAD NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION SMALL DECOUPLING CERAMIC CAPACITOR MOS INPUT STAGE
APPLICATION NOTE An external capacitor (COUT = 1F typical) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6 is used to ensure stability. Figure 1 : Block Diagram
IN
?
? OUT
PWRDWN
?
APPLICATIONS - Cellular and Cordless phones supplied by 1 cell Lithium-ion battery / 3 cells Ni-MH or Ni-Cd battery. - PDA (Personal Digital Assistant), Smart phone. - Portable equipment. - Supply for RF devices for cellular phone. Figure 2 : Typical Application Circuit IN OUT LDO_59 VREF
VIN
?
?
VOUT
Power Down Mode
PWRDWN ON
1F
? LDO_59
ESR COUT
OFF ? 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_59
ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30C < T < 125C, 0.8F < COUT < 1.2F, 20m < ESR < 0.6, 100A < ILOAD < 20mA. Typical case : VIN = 4V, T = 25C, IOUT = 10mA.
Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current PMOS Output Resistance Dropout Voltage ILOAD RON VDO VOUT = 50mV, ILOAD = 20mA (Note 2) Quiescent current IQ ILOAD = 100A ILOAD = 20mA Power down mode quiescent current Power Supply Rejection Ratio IQPRWDWN PSRR Power down active DC to 10KHz f < 100KHz Load Regulation Line Regulation Line Transient Ldr Lir Lirt I LOAD = 20mA, VOUT = 2.8V VOUT = 2.8V, ILOAD = 20mA, VIN = 300mV tRISE = tFALL = 10s Load Transient Ldtr VOUT = 2.8V tFALL = tRISE = 10s Recovery time Output Noise Voltage en VOUT = 2.8V 100Hz < f < 1KHz 1KHz < f < 100KHz Output decoupling capacitor Settling time (from power down to active mode) Short Circuit Current Limit ISHORT COUT VOUT = 2.8V, COUT = 1.2F 1 20 50 200 60 0,3 4 160 1 6 200 nV ----------Hz F s mA mV s 0,5 1 mV 55 40 170 50 70 100 70 50 6 0,5 9 1 mV mV 70 150 A A nA dB Symbol VIN VOUT Test Condition Min 3 2,8 3 20 0,6 60 Typ Max 5,5 Unit V V % mA mV
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 min dropout voltage.
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TYPCIAL CHARACTERISTICS Figure 3 : Line transient (rising edge) Figure 4 : Line transient (falling edge)
Figure 5 : Load transient (rising edge)
Figure 6 : Load transient (falling edge)
Figure 7 : Settling time
Figure 8 : PSRR vs Frequency (ILOAD = 20mA ; VINmin)
70
65
PSRR (dB)
60
55
50 100
1000
10000
100000
Frequency (Hz)
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LDO_59
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 (c) 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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