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AIC1731
300mA, Low Dropout Linear Regulator with Shutdown
FEATURES
Active Low Shutdown Control. Very Low Quiescent Current. Very Low Dropout Voltage of 470mV at 300mA Output Current (3.0V Output Version) 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V Output Voltage. Short Circuit and Thermal Protection. 2% Output Tolerance. Miniature Package: SOT-23-5
DESCRIPTION
AIC1731 is a 300mA low noise, low dropout linear regulator, and is housed in small SOT-23-5 package. The device is in the "ON" state when the SHDN pin is set to logic high level. An internal P-MOSFET pass transistor is used to achieve 470mV low dropout voltage at 300mA load current. 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 AIC1731 provide enhanced performance for critical applications. The noise bypass pin can be connected an external capacitor to reduce the output noise level.
APPLICATIONS
PDA DSC Notebook Pagers Personal Communication Equipment Cordless Telephones Portable Instrumentation Portable Consumer Equipment Battery Powered Systems
TYPICAL APPLICATION CIRCUIT
VIN CIN 1F GND VIN
+
VOUT
+
VOUT COUT 1F
SHDN
BP CBP AIC1731 0.1F
V SHDN
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-1731P-03
092304
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AIC1731
ORDERING INFORMATION
AIC1731-XXXXXX PACKING TYPE TR: TAPE & REEL BG: BAG PACKAGE TYPE V: SOT-23-5 C: COMMERCIAL P: LEAD FREE COMMERCIAL OUTPUT VOLTAGE 15: 1.5V 18: 1.8V 25: 2.5V 28: 2.8V 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: AIC1731-18CVTR 1.8V Version, in SOT-23-5 Package & Tape & Reel Packing Type AIC1731-18PVTR 1.8V Version, in SOT-23-5 Lead Free Package & Tape & Reel Packing Type PIN CONFIGURATION SOT-23-5 (CV)(PV) TOP VIEW 1: VIN 2: GND 3: SHDN 4: BP 5: VOUT
5 4
1
2
3
* SOT-23-5 Marking
Part No. AIC1731-15CV AIC1731-18CV AIC1731-25CV AIC1731-28CV AIC1731-30CV AIC1731-33CV Marking ED15 ED18 ED25 ED28 ED30 ED33 Part No. AIC1731-15PV AIC1731-18PV AIC1731-25PV AIC1731-28PV AIC1731-30PV AIC1731-33PV Marking ED15P ED18P ED25P ED28P ED30P ED33P
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AIC1731
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ................................................................................................12V ...............................................................................12V ............................................................................5V ...............................................................-40C~85C 125C ...................................................................-65C~150C 260C SOT-23-5 ........................................130C /W SOT-23-5 ........................................220C /W Shutdown Terminal Voltage Noise Bypass Terminal Voltage 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.
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT
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AIC1731
ELECTRICAL CHARACTERISTICS
(CIN=1F, COUT=4.7F, 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 = VOUT(TYP) + 1V to 7V VIN = VOUT + 1.2V (Vout 2.0V) VIN = VOUT + 1.7V (Vout 1.9V) IOUT = 0.1~300mA 3.0VVOUT3.3V 2.5VVOUT2.9V 2.0VVOUT2.4V 1.5VVOUT1.9V TEST CONDITIONS IOUT = 0mA, VIN = 3.6~7V VIN = 3.6~7V, output OFF IOUT = 0.1~300mA VIN = 5V VIN = 5V, VOUT = 0V VIN = 5V, no load SYMBOL MIN. IQ ISTBY IGND IOUT IIL VOUT TC VLIR VLOR 300 -2 50 3 10 470 570 800 1260 1.23 0.46 450 2 150 10 30 870 970 1200 1660 30 TYP. 35 MAX. 50 0.1 50 300 UNIT A A A mA mA % ppm/C mV mV
Dropout Voltage
IL=300mA
VDROP
mV
Noise Bypass Terminal Voltage Output Noise CBP = 0.1F, f = 1KHz,VIN = 5V f = 1KHz, Ripple = 0.5VP-P, CBP = 0.1F
VREF n
V
V
Hz
dB
Ripple Rejection
RR
55
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AIC1731
ELECTRICAL CHARACTERISTICS
PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
SHUTDOWN TERMINAL SPECIFICATIONS Shutdown Pin Current Shutdown Pin Voltage (ON) Shutdown Pin Voltage (OFF) Shutdown Exit Delay Time THERMAL PROTECTION Thermal Shutdown Temperature TSD 155 C Output ON Output OFF CBP=0.1F, COUT=1F, IOUT=30mA I SHDN V SHDN (ON) V SHDN (OFF) t 300 1.6 0.6 0.1 A V V S
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).
TYPICAL PERFORMANCE CHARACTERISTICS
60 50 40 30 20 700
1.5V 3.3V VDROP (mV)
600 500 400 300 200 100
AIC1731-33
Quiescent Current (A)
T=80C T=50C
10 0 0 1
T=20C T=-40C
50 100 150 200 250 300
VIN (V) Fig. 1 Quiescent Current vs. VIN
2
3
4
5
6
7
0
0
ILOAD (mA) Fig. 2 VDROP vs. ILOAD
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AIC1731
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
44.0 43.5 43.0 800
Short Circuit Current (A)
700 600 500 400 300 200 100 0
Ground Current (A)
42.5 42.0 41.5 41.0 40.5 40.0 39.5 39.0 0 50 100 150
3.3V 1.5V
3.3V 1.5V
VIN=6V TA=25C
200 250 300
0
1
2
3
4
5
6
7
ILOAD (mA)
Fig. 3 Ground Current vs. ILOAD
Input Voltage (V) Fig. 4 Input Voltage vs. Short Circuit Current
45 44
46
AIC1731-33 300mA
Quiescent Current (A)
44
1.5V
3.3V
Ground Current (A)
43
150mA
42 41
42
40
30mA
40
38
39 -40 -20 0 20 40 60 80 100
36 -40 -20 0 20 40 60
VIN=5V
80 100
Temperature (C) Fig. 5 Ground Current vs. Temperature
Temperature (C) Fig. 6 Quiescent Current vs Temperature
3.50 3.45 3.40
AIC1731-33
IOUT=30mA CBP=0.1F COUT=1F VOUT
Output Voltage (V)
3.35 3.30 3.25 3.20 3.15 3.10
VSHDN
VIN=5V
-40 -20 0 20 40 60 80 100
Temperature (C) Fig. 9 Output Voltage vs. Temperature
Fig. 10 Shutdown Exit Time
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AIC1731
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
700 640
AIC1731-33
600
620 600 580 560
VDROP (mV)
T=50C
T=80C
400 300 200 100 0 0 50 100 150 200 250 300
Current Limit (mA)
500
VIN=6V
540 520 500 480 -40
VIN=7V
VIN=5V
T=20C T=-40C
-20
0
20
40
60
80
100
ILOAD (mA) Fig. 11 VDROP vs. ILOAD
Temperature (C) Fig. 12 Current Limit vs. Temperature
CBP=0.1F VOUT COUT=4.7F VOUT
CBP=0.1F COUT=1F
IOUT=180mA IOUT=120mA IOUT=120mA
IOUT=180mA
Fig. 13 Load Transient Response
Fig. 14 Load Transient Response
Vin=VOUT+2V
Vin=VOUT+2V
Vin=VOUT+1
Vin=VOUT+1V
VOUT=3.3V
CIN=1F, COUT=1F CBP=0.1F Iout=50mA
VOUT=3.3V
CIN=1F, COUT=4.7F CBP=0.1F Iout=50mA
Fig. 15 Line Transient Response
Fig. 16 Line Transient Response
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AIC1731
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
VIN=Vout+2V
VIN=Vout+2V
Vin=Vout+1V
VIN=Vout+1V
VOUT=1.5V
CIN=1F, COUT=1F CBP=0.1F Iout=50mA
VOUT=1.5V
CIN=1F, COUT=4.7F CBP=0.1F Iout=50mA
Fig. 17 Line Transient Response
Fig. 18 Line Transient Response
BLOCK DIAGRAM
VIN Current Limiting
BP VREF 1.23V SHDN Power Shutdown
- Error Amp. + Thermal Limiting
VOUT
GND
PIN DESCRIPTIONS
Power supply input pin. Bypass with a 1F capacitor to GND PIN 2 : GND - Ground pin. PIN 3 : SHDN - Active-Low shutdown input pin. PIN 1 : VIN PIN 4 : BP - Noise bypass pin. An external bypass capacitor connected to BP pin reduces noises at the output. PIN 5 : VOUT - Output pin. Sources up to 300 mA.
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AIC1731
DETAILED DESCRIPTIONS 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. 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 = 7V 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 300mA. CURRENT LIMIT (IIL) AIC1731 includes a current limiting, which monitors and controls the maximum output current if the output is shorted to ground. This can protect the device from being damaged. 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.
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors to maintain stability. Input capacitor at 1F with a 1uF aluminum electrolytic output capacitor is recommended. To avoid oscillation, ceramic capacitor is rejected. NOISE BYPASS CAPACITOR 0.1F 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 AIC1731 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)
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AIC1731
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
PHYSICAL DIMENSIONS
SOT-23-5 (unit: mm)
D
SYMBOL A A1 A2 b c D E E1
MIN 0.95 0.05 0.90 0.30 0.08 2.80 2.60 1.50
MAX 1.45 0.15 1.30 0.50 0.22 3.00 3.00 1.70 0.95 BSC 1.90 BSC
E E1 L L1 e e1
0.25 c
A2
A A1 b
e e1 L L1 0 0.30
0.60 0.60 REF 8
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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