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AIC1742
Low Noise, Low Quiescent Current, 150mA Linear Regulator with Noise Bypass
FEATURES
Very Low Noise, 25VRMS @ f=10~100kHz. Very Low Quiescent Current, 35A. Very Low Dropout Voltage, 90mV @ 50mA. Active Low Shutdown Control. Short Circuit and Thermal Protection. 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 2.85V, 2.9V, 3.0V, 3.3V Output Voltage. Available in 2% Output Tolerance. Low Profile Package: SOT-23-5
DESCRIPTION
AIC1742 is a low noise, low dropout linear regulator, and is housed in a small SOT-23-5 package. The device is in the "ON" state when the SHDN pin is set to logic high level. A low dropout voltage of 90mV at 50mA load current is performed. It offers high precision output voltage of 2%. The quality of low quiescent current and low dropout voltage makes this device ideal for battery power applications. The internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. The high ripple rejection and low noise of AIC1742 provide enhanced performance for critical applications. The noise bypass pin can be connected an external capacitor to reduce the output noise level.
APPLICATIONS
Cellular Telephones. Pagers. Personal Communication Equipment. Cordless Telephones. Portable Instrumentation. Portable Consumer Equipment. Radio Control Systems. Low Voltage Systems. Battery Powered Systems
TYPICAL APPLICATION CIRCUIT
VIN CIN 1F GND
VIN
VOUT COUT 2.2F
VOUT
SHDN
BP CBP AIC1742 0.01F
V SHDN
* CIN : TAIYO YUDEN, CEJMK107BJ105MA-T *COUT : TAIYO YUDEN, CEJMK107BJ225M-T Low Noise Low Dropout Linear Regulator
Analog Integrations Corporation
Si-Soft Research Center 3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
DS-1742P-02 010405
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AIC1742
ORDERING INFORMATION
AIC1742-XXX XXX XX PACKING TYPE TR: TAPE & REEL BG: BAG C: COMMERCIAL ACV: SOT-23-5 BCV: SOT-23-5 P: LEAD FREE COMMERCIAL APV: SOT-23-5 BPV: SOT-23-5 OUTPUT VOLTAGE 15: 1.5V 18: 1.8V 20: 2.0V 25: 2.5V 28: 2.8V 285: 2.85V 29: 2.9V 30: 3.0V 33: 3.3V (Of a unit of 0.1V within the voltage range from 1.5V to 3.3V, additional voltage versions for this product line may be available on demand with prior consultation with AIC.) Example: AIC1742-15ACVTR 1.5V Version, in SOT-23-5 Package & Tape & Reel Packing Type AIC1742-15APVTR 1.5V Version, in SOT-23-5 Lead Free Package & Tape & Reel Packing Type PIN CONFIGURATION
SOT-23-5 FRONT VIEW (AXV) 1. VIN 2. GND 3. SHDN 4. BP 5. VOUT (BXV) 1. VOUT 2. GND 3. VIN 4. SHDN 5. BP
5
4
1
2
3
2
AIC1742
* SOT-23-5 Marking
Part No. AIC1742-15AXV AIC1742-18AXV AIC1742-20AXV AIC1742-25AXV AIC1742-28AXV AIC1742-285AXV AIC1742-29AXV AIC1742-30AXV AIC1742-33AXV ACV ER15 ER18 ER20 ER25 ER28 ER2J ER29 ER30 ER33 APV ER15P ER18P ER20P ER25P ER28P ER2JP ER29P ER30P ER33P Part No. AIC1742-15BXV AIC1742-18BXV AIC1742-20BXV AIC1742-25BXV AIC1742-28BXV AIC1742-285BXV AIC1742-29BXV AIC1742-30BXV AIC1742-33BXV BCV ES15 ES18 ES20 ES25 ES28 ES2J ES29 ES30 ES33 BPV ES15P ES18P ES20P ES25P ES28P ES2JP ES29P ES30P ES33P
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Shutdown Terminal Voltage Power Dissipation Operating Temperature Range Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 sec) Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient (Assume no ambient airflow, no heatsink) Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 9V .9V 500mW -40C~85C 125C -65C~150C 260C 130C/W 220C/W
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT
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AIC1742
ELECTRICAL CHARACTERISTICS
(TJ=25C, unless otherwise specified) (Note1)
PARAMETER Quiescent Current Standby Current GND Pin Current Continuous Output Current Output Current Limit Output Voltage Tolerance Temperature Coefficient Line Regulation Load Regulation VIN = VOUTTYP + 1V to 8V VIN = 5V, IOUT = 0.1~150mA IOUT = 50 mA Dropout Voltage IOUT = 100 mA Vout2.5V IOUT = 150 mA IOUT = 150 mA Vout<2.5V Noise Bypass Voltage Ripple Rejection Output Noise Shutdown Pin Current Shutdown Pin Voltage (ON) Terminal f=1KHz, Ripple=0.5VP-P, CBP = 0.1F CBP = 0.1F, f = 10~100KHz V SHDN =1.6V Output ON VREF RR VDROP TEST CONDITIONS VIN = VOUT+ 1V, V SHDN =1.6V, IOUT = 0mA VIN = VOUT+ 1V to 8V, V SHDN =0.6V, Output OFF IOUT = 50mA VIN = VOUT + 1V to 8V VIN = VOUT + 1V, VOUT = 0V VIN = VOUT + 1V, no load SYMBOL IQ ISTBY IGND IOUT IIL VOUT TC VLIR VLOR 150 -2 50 2 0.005 90 140 200 500 1.25 65 25 2 1.6 0.6 300 250 2 150 5 0.01 160 230 350 800 V dB Vrms A V V S mV 2.5 MIN. TYP. 35 MAX. 45 0.1 3.5 150 UNIT A A mA mA mA % ppm/C mV %/mA
n
I SHDN V SHDN ON V SHDN OFF t
SHUTDOWN TERMINAL SPECIFICATIONS
Shutdown Pin Voltage (OFF) Output OFF Shutdown Exit Delay Time CBP = 0.1F, COUT = 1F, IOUT=30mA
Note 1: Specifications are production tested at TA=25C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). Note 2: The dropout voltage is defined as VIN - VOUT when VOUT is 1% below the value of VOUT for VIN = VOUT + 0.5V. (Only applicable for VOUT = 2.5V ~ 5V)
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AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS
60
AIC1742
14 12 10 8 6 4 2 0
AIC1742 TA=25C
Quiescent Current (A)
50
40
30
TA=25C
20
VSHDN=1.6V IOUT=0mA
10
0
Ground Current (mA)
2
3
4
5
6
7
8
9
10
0
20
40
60
80
100
120
140
Input Voltage (V)
Output Current (mA)
Fig. 1 Quiescent Current
350 300
Fig. 2 Ground Current
1.0
AIC1742 T=25C
Output Voltage Deviation (%)
0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -40 -20 0 20 40 60 80 100 120
Short-Circuit Current (mA)
250 200 150 100 50 0
AIC1742-33
VIN=5V AIC1742-15 VSHDN=1.6V IOUT=0mA
0
1
2
3
4
5
6
7
Input Voltage (V)
Temperature (C)
Fig. 3 Short-Circuit Current
35 30 50
Fig. 4 Output Voltage
AIC1742
Load Regulation (mV)
Load Regulation (mV)
VIN=5V VSHDN=1.6V TA=25C
AIC1742-33
AIC1742-15
40
25 20 15 10 5 0 10
VSHDN=1.6V TA=25C
30
AIC1742-15
20
IOUT=150mA
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150
0 2.0
IOUT=100mA
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Output Current (mA) Fig. 5 Load Regulation
Input Voltage (V) Fig. 6 Load Regulation
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AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS
34 32
300
(Continued)
AIC1742-33
VSHDN=1.6V TA=25C
Dropout Voltage (mV)
250
AIC1742-25
Load Regulation (mV)
30 28 26 24 22 20 18 16 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
200
IOUT=150mA
150
100
IOUT=100mA
50
TA=25C
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Input Voltage (V) Fig. 7 Load Regulation
800 700 100
Output Current (mA) Fig. 8 Dropout Voltage
AIC1742-20 Ripple Rejection (dB)
AIC1742-20
Dropout Voltage (mV)
600
500
80
400 300
200
60
40
CBP=0.1F
CBP=0.01F COUT=2.2F Ceramic IOUT=0mA
20
100
0 10 20
TA=25C
30
40 50 60 70
80
90
100 110
120 130 140 150
0 10
10
2
10
3
10
4
10
5
10
6
Output Current (mA) Fig. 9 Dropout Voltage
Frequency (Hz)
Fig. 10 Input Ripple Rejection
100
AIC1742-30
100
AIC1742-20 CBP=0.01F
Ripple Rejection (dB)
Ripple Rejection (dB)
80
80
60
60
40
CBP=0.1F
CBP=0.01F COUT=2.2F Ceramic IOUT=0mA
40
CBP=0.1F COUT=2.2F Ceramic IOUT=100mA
20
20
0 10 10
2
10
3
10
4
10
5
10
6
0 10 10
2
10
3
10
4
10
5
10
6
Frequency (Hz)
Frequency (Hz)
Fig. 11 Input Ripple Rejection
Fig. 12 Input Ripple Rejection
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AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS
100
(Continued)
AIC1742-30 CBP=0.01F
Ripple Rejection (dB)
80
60
VSHDN, 2V/Div
40
CBP=0.1F COUT=2.2F Ceramic IOUT=100mA
20
VOUT, 1V/Div
0 10 10
2
10
3
10
4
10
5
10
6
Frequency (Hz)
Fig. 13 Input Ripple Rejection
Vin, 500mV/Div VIN=3.5~4.5V VOUT=2.5V COUT=2.2F Ceramic IOUT=60mA
Fig. 14 Shutdown Delay
VIN=4.5~3.5V VOUT=2.5V COUT=2.2F Ceramic IOUT=60mA Vin, 500mV/Div
Vout, 20mV/Div
2 1 2) Ch 2:
Vout, 20mV/Div
2 1 2) Ch 2:
1) Ch 1:
500 mVolt 25 us 20 mVolt 25 us
1) Ch 1:
500 mVolt 100 us 20 mVolt 100 us
Fig. 15 Line Transient Response
Vout, 20mV/Div
Fig. 16 Line Transient Response
CH1:20mV/Div
VIN=5V VOUT=2.5V COUT=2.2F Ceramic IOUT=0~100mA
VIN=5V VOUT=2.5V COUT=2.2F Ceramic Iout=0~100mA
Iout, 50mA/Div
2> 1 2) Ch 2:
1) Ch 1:
20 mVolt 10 us 10 mVolt 10 us
2>
Iout, 50mA/Div
1) Ch 1: 20 mVolt 10 us 10 mVolt 10 us
1 2) Ch 2:
Fig. 17 Transient Response 2
Fig. 18 Load Transient Response
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AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS
60
(Continued)
50
Output Noise (V)
40
COUT=4.7F Ceramic CNB=0.01F f=10Hz to 100KHz
AIC1742-33
30
20
AIC1742-15
10
0 0.1
1
10
100
Output Current (mA)
Fig. 19 Output Noise RMS
BLOCK DIAGRAM
VIN Control Circuit
SHDN
-
Error Amp
1.25V REF
Bias Circuit
+
Current Limit
Thermal Shutdown
VOUT
Disconnect Circuit GND BP
PIN DESCRIPTIONS
VIN PIN GND PIN SHDN PIN Power supply input pin. Bypass with a 1F capacitor to GND. Ground pin. Active-Low shutdown input pin. BP PIN Noise bypass pin. An external bypass capacitor connecting to BP pin to reduce noises at the output. VOUT PIN - Output pin. Sources up to 150 mA. -
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AIC1742
DETAILED DESCRIPTION OF TECHNICAL TERMS
DROPOUT VOLTAGE (VDROP) The dropout voltage is defined as the difference between the input voltage and output voltage at which the output voltage drops 100mV. Below this value, the output voltage will fall as the input voltage reduces. It depends on the load current and junction temperature. STANDBY CURRENT (ISTBY) Standby current is the current flowing into the regulator when the output is shutdown by setting V SHDN at 0V and VIN at 8 V. CURRENT LIMIT (IIL) Current limiting of AIC1742 monitors and controls the maximum output current, in case of a shorted output. It protects device from the damage resulting from any unexpected current. RIPPLE REJECTION (RR) Ripple rejection is the ability of the regulator to reduce voltage ripple, which comes from input, at output terminal. It is specified with a signal of 0.5VP-P at 1KHz frequency applying to input, output capacitor at 2.2F as well as a noise bypass of 0.1F. Ripple rejection, expressed in dB, is the ratio of output ripple to input. THERMAL PROTECTION Thermal sensor protects device when the junction temperature exceeds TJ= +155C. It signals shutdown logic, turning off pass transistor and allowing IC to cool down. After the IC's junction temperature cools by 15C, the thermal sensor will turn the pass transistor back on. Thermal protection is designed to protect the device in the event of fault conditions. For a continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ= 150C, or damage may occur to the device.
LINE REGULATION Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The line regulation is specified as the input voltage changes from VIN = VOUT + 1V to VIN = 8V and IOUT = 1mA. LOAD REGULATION Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. A pulsed measurement with an input voltage set to VIN = VOUT + VDROP can minimize temperature effects. The load regulation is specified by the output current ranging from 0.1mA to 150mA. QUIESCENT CURRENT (IQ) Quiescent current is the current flowing through ground pin with no output load. GROUND CURRENT (IGND) Ground current is the current flowing through the ground pin with output load.
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AIC1742
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors to maintain stability. Input capacitor at 1F with 1uF aluminum electrolytic or 2.2F ceramic output capacitor is recommended. And it should be selected within the Equivalent Series Resistance (ESR) range as shown in the figure 20,21. ESR of ceramic capacitor is lower and its electrical characteristics (capacitance and ESR) vary widely over temperature. In general, tantalum or electric output capacitor is suggested for heavy load. Normally, the output capacitor should be 1F (aluminum electrolytic) at least and rates for operating temperature range. Note that it's important to check selected manufactures electrical characteristics (capacitance and ESR) over temperature. NOISE BYPASS CAPACITOR 0.01F bypass capacitor at BP pin reduces output voltage noise. And the BP pin has to connect a capacitor to GND. POWER DISSIPATION The maximum power dissipation of AIC1742 depends on the thermal resistance of its case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature. When the IC mounting with good thermal conductivity is used, the junction temperature will be low even when large power dissipation applies. The power dissipation across the device is P = IOUT (VIN-VOUT). The maximum power dissipation is:
PMAX = (TJ - TA) (RJB + RBA)
Where TJ-TA is the temperature difference between the die junction and the surrounding air, RJB is the thermal resistance of the package, and RBA is the thermal resistance through the PCB, copper traces, and other materials to the surrounding air. As a general rule, the lower temperature is, the better reliability of the device is. So the PCB mounting pad should provide maximum thermal conductivity to maintain low device temperature. GND pin performs a dual function of providing an electrical connection to ground and channeling heat away. Therefore, connecting the GND pin to ground with a large pad or ground plane would increase the power dissipation and reduce the device temperature.
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AIC1742
100
100
Serial Resistor ()
10
10
COUT=4.7F
COUT ESR ()
COUT=1F Stable Region
0.1
1
COUT=2.2F
0.1
Stable Region
0.01 0 20 40 60 80 100 120 140
0.01 0 20 40 60 80 100 120 140
Load Current (mA) Fig. 20 Stable Region with extra Serial Resistor vs. Load Current
Load Current (mA) Fig. 21 Region of Stable COUT ESR vs. Load Current
PHYSICAL DIMENSIONS
SOT-23-5 (unit: mm)
D
S Y M B O L
SOT-25 MILLIMETERS MIN. 0.95 0.05 0.90 0.30 0.08 2.80 2.60 1.50 0.95 BSC 1.90 BSC 0.30 0.60 REF 0 8 0.60 MAX. 1.45 0.15 1.30 0.50 0.22 3.00 3.00 1.70
A
E1
A1 A2 b
E
A
A
e e1
SEE VIEW B
c D E
b A2
WITH PLATING
E1 e
A
c
e1
BASE METAL SECTION A-A
L L1
A1
0.25 L L1 VIEW B
GAUGE PLANE SEATING PLANE
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AIC1742
Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
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