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AIC1729
400mA Low Dropout Linear Regulator with Voltage Detector Function
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FEATURES
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DESCRIPTION
The AIC1729 is a low dropout linear regulator with voltage detection function. It can be divided into 4 main function blocks, including MOSFET for VOUT1, VOUT2 ,voltage detector, and controls. LDO for two shutdown
Including MOSFET for VOUT1, LDO for VOUT2, voltage detector, and shutdown control Low Dropout Voltage of 550mV(Typ.) at 400mA Output Current (VOUT2). Guaranteed 700mA Output Current for VOUT1 and 400mA for VOUT2. Low Ground Current at 120A. 2% Accuracy Output Voltage of VOUT2. Current Limit Function. Built in Voltage Detector Shutdown Control for VOUT1 and VOUT2
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Voltage detector can be use to detect Vcc. The detecting voltage of the voltage detector is from 3.0V to 4.6V with 0.1V step. And the output (DOUT) of detecting voltage for Vcc with delay time adjustment function to indicate VCC low. User only adds one external capacitor to finish it. When VCC pin is under the set detection voltage. DOUT pin is logic low. VOUT1 is controlled by SD1 pin. When SD1 is logic high, the internal MOSFET for VOUT1 will be switched off, vice versa. The LDO output voltage (VOUT2) is from 1.8V to 4.0V with 0.1V step for different application. It is also controlled by SD2 pin. When SD2 is logic high, the internal LDO for VOUT2 will be shutdown, vice versa. The superior characteristics of the AIC1729 include very low dropout voltage, and 2% accuracy output voltage. Typical ground current remains 120 A, from no load to maximum loading conditions. Dropout voltage of VOUT2 is 550mV at 400mA output current. Output current limiting is provided at VOUT1 and VOUT2. AIC1729 comes in the popular SO8 package.
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APPLICATIONS
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Voltage Regulator for DVD-ROM and CD-ROM Drivers. Voltage Regulator for HDD and Floppy Drivers. Voltage Regulator for circuits with Stepping Motor or Servo Motor.
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Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
DS-1729-04 032102
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AIC1729
n TYPICAL APPLICATION CIRCUIT
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ORDERING INFORMATION
AIC1729-XX XXCXXX
PACKING TYPE TB: TUBE TR: TAPE & REEL (not available for CN package) PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE LDO OUTPUT VOLTAGE 18: 1.8V : : 40: 4.0V VOLTAGE DETECTOR VOLTAGE 30: 3.0V : : 46: 4.6V * LDO Output Voltage and Voltage Detector voltage with every 0.1V a step.
PIN CONFIGURATION
TOP VIEW
VCC VOUT1 SD1 CD
1 2 3 4
8 7 6 5
VOUT2 SD2 GND DOUT
Example: AIC1729-3018CN a 3.0V Voltage Detector Voltage, 1.8V LDO Output Voltage, in DIP-8 Package Type
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AIC1729
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ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ................................ ......... ... ... ... .................................... -0.3~8V Operating Ambient Temperature Range .......... ... ... .............. ................... -40C~ 85C Storage Temperature Range ..................... .......... ... ... ... .......................... -65C~150C Thermal Resistance JA SOIC Package ....... ... ...... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .......... 100C/W SOIC Package (with 3 square inches of Copper) .... ... ... ... ... ... ... 90C/W
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ELECTRICAL CHARACTERISTICS
SD1=SD2=Low, unless otherwise specified.) PARAMETER
(TA=25C, VIN=5.0V, IOUT1=IOUT2 =400mA,
TEST CONDITIONS IOUT1=0.1mA~700mA
MIN.
TYP.
MAX.
UNIT A
Ground Current Output Voltage Temperature Coefficiency VOUT1 Output MOSFET Resistance Current Limit(Note 3) Output Turn-on Rise Delay Output Turn-on Rise Time SD1 Pin Voltage
IOUT2=0.1mA~400mA VIN= 4.0V~8.0V (Note 1)
120
200
100
PPM/C
VIN= 5.0V 700
370 950 100 1000
450
m mA S S
VSD=Logic"0" VSD=Logic"1" 2.4 VSET x 0.98 3 50 400 650 VSET
0.8
V
VOUT2 ( 1.8V ~ 4.0V with 0.1V step ) LDO Output Voltage Line Regulation Load Regulation (Note 2) Current Limit (Note 3) No Load IL=1mA,VIN=4.0V~8.0V VIN=5V,IL=0.1mA~400mA VSET x 1.02 10 90 V mV mV mA
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AIC1729
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ELECTRICAL CHARACTERISTICS
PARAMETER
(Continued) MIN. TYP. 140 280 420 550 250 420 600 780 700 880 1050 1220 2.4 VDSET x 0.98 VDSET x 1.02 MAX. 200 350 500 700 300 500 700 900 800 950 1150 1400 0.8 V mV UNIT
TEST CONDITIONS IL=100mA VOUT 3.3V IL=200mA IL=300mA IL=400mA IL=100mA
Dropout Voltage (Note 4)
2.5V VOUT<3.3V
IL=200mA IL=300mA IL=400mA IL=100mA
VOUT < 2.5V
IL=200mA IL=300mA IL=400mA
SD2 Pin Voltage
VSD=Logic"0" VSD=Logic"1"
Voltage Detector ( 3.0V ~ 4.6V with 0.1V step ) Detect Voltage(VDET) Detect Threshold Hysteresis VDOUT Delay Time When VDET is Detected When VDET is not Detected CD Pin Open 1.65 1 3 VDSET VDET x 1.05 0.6 V V V mS
Note 1: Guaranteed by design. Note 2: Regulation is measured at constant junction temperature, using pulse testing with a low ON time. Note 3: Current limit is measured by pulsing a short time. Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below the value measured with a 1V differential.
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AIC1729
n TYPICAL PERFORMANCE CHARACTERISTICS
3.32 100 3.30 3.28 80 60
3.26
Load regulation (mV)
100 200 300 400 500 600
VOUT (V)
40 20 0
3.24 3.22
3.20 0
0
100
200
300
400
500
Loading Current (mA)
Load Current (mA)
Fig. 1 Output voltage vs. Loading Current
Fig. 2
Load Regulation
Fig. 3
Line Transient
Fig. 4
Load Transient
0.35
0.40 0.38
0.34
0.36
Switch Ron ()
Switch Ron ()
0.34 0.32 0.30 0.28 0.26 0.24 0.22
0.33
0.32
I_load=500mA
0.31
0.30
0
200
400
600
800
1000
0.20 -40
-20
0
20
40
60
80
Loading Current (mA)
Temperature (C)
Fig. 5 Switch Ron vs. Loading current (mA)
Fig. 6
Switch Ron vs. Temperature
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AIC1729
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
3.40
I_load=400mA
3.35
I_load=250mA
VOUT (V)
I_load=100mA
3.30
I_load=0mA
3.25 -40 -20 0 20 40 60 80 100
Temperature (C) Fig. 7 Output voltage vs. Temperature
Fig. 8
Output Turn-on Rise Time
500
Detector Voltage
400
V_det=4.5 V
Delay Time (ms) DOUT
300
200
100
0
0
50
100
150
200
250
300
350
400
External Capacitor (nF)
Fig. 9
Built-in Delay Time Waveform
Fig. 10 Delay Time vs. External Capacitor
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BLOCK DIAGRAM
VCC VOUT1
CD
SD Control
SD1
DOUT
Voltage Detector
1.8~4.0V LDO SD Control
VOUT2
GND
SD2
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AIC1729
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PIN DESCRIPTION
PIN 1: VCCThis pin is the main input supply for the IC, normally 5V PIN 2: VOUT1- This pin is the voltage output which directly is via connected internal to Vcc MOSFET PIN 6: GNDPIN 7: SD2PIN 5: DOUTPIN 4: CDThis pin is to determine delay time by attaching a capacitor This pin is voltage detector
output, pulled low when VIN detected IC ground pin VOUT2 shutdown pin. Logic high input for disabling LDO output. PIN 8: VOUT2- This pin is 3.3V LDO voltage output
switch, normally 5V PIN 3: SD1VOUT1 shutdown pin. Logic high input for disabling the internal MOS Switch.
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PHYSICAL DIMENSIONS
8 LEAD PLASTIC SO (unit: mm)
D
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SYMBOL A
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40
MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27
A1 B C D
e A C A1
E e H
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1.27(TYP)
B
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AIC1729
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8 LEAD PLASTIC DIP (unit: mm)
D
SYMBOL A1
E1
MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 -- 2.92
MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81
A2 b C
E
D E
C
A2 A1
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E1 e eB L
2.54 (TYP)
eB b e
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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