AIC1729
400mA Low Dropout Linear Regulator
with Voltage Detector Function
FEATURES
Including MOSFET for V
OUT
1
, LDO for V
OUT2
,
voltage detector, and shutdown control
Low Dropout Voltage of 550mV(Typ.) at 400mA
Output Current (V
OUT2
).
Guaranteed 700mA Output Current for V
OUT1
and 400mA for V
OUT2
.
Low Ground Current at 120µA.
2% Accuracy Output Voltage of V
OUT2
.
Current Limit Function.
Built in Voltage Detector
Shutdown Control for V
OUT1
and V
OUT2
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 V
OUT1
, LDO for
V
OUT2 ,
voltage detector, and two shutdown
controls.
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
V
CC
low. User only adds one external
capacitor to finish it. When V
CC
pin is under
the set detection voltage. D
OUT
pin is logic
low.
V
OUT1
is controlled by SD1 pin. When SD1 is
logic high, the internal MOSFET for V
OUT1
will
be switched off, vice versa.
The LDO output voltage (V
OUT2
) 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 V
OUT2
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
µ
A, from no load to
maximum loading conditions. Dropout voltage
of V
OUT2
is 550mV at 400mA output current.
Output current limiting is provided at V
OUT1
and V
OUT2
.
AIC1729 comes in the popular SO8 package.
APPLICATIONS
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.
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-1729P-01 042706
1
AIC1729
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage
Control Input (V
CTL
)
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
Thermal Resistance, Rθ
JC
(Junction to Case)
Thermal Resistance, Rθ
JA
(Junction to Ambient)
(Assume no Ambient Airflow, no heatsink)
DIP-8
SOP-8
DIP-8
SOP-8
-0.3~8V
-0.3V ~7V
-40°C~85°C
125°C
-65°C ~ 150°C
260°C
60°C /W
40°C /W
100°C/W
160°C/W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
ELECTRICAL CHARACTERISTICS
SD1=SD2=Low, unless otherwise specified.) (Note2)
PARAMETER
Ground Current
Output Voltage Temperature
Coefficiency
VOUT1
Output MOSFET Resistance
Current Limit(Note 4)
Output Turn-on Rise Delay
Output Turn-on Rise Time
SD1 Pin Voltage
V
SD
=Logic”0”
V
SD
=Logic”1”
V
IN
= 5.0V
(TA=25°C, V
IN
=5.0V, I
OUT1
=I
OUT2
=400mA,
TEST CONDITIONS
I
OUT1
=0.1mA~700mA
I
OUT2
=0.1mA~400mA
V
IN
= 4.0V~8.0V
(Note 3)
MIN.
TYP.
120
MAX.
200
UNIT
µA
100
PPM/°C
370
700
950
100
1000
450
mΩ
mA
µS
µS
0.8
2.4
V
SET
×
0.98
V
SET
3
50
400
650
V
SET
×
1.02
10
90
V
VOUT2 ( 1.8V ~ 4.0V with 0.1V step )
LDO Output Voltage
Line Regulation
Load Regulation
(Note 5)
Current Limit
(Note 4)
No Load
I
L
=1mA,V
IN
=4.0V~8.0V
V
IN
=5V,I
L
=0.1mA~400mA
V
mV
mV
mA
3
AIC1729
ELECTRICAL CHARACTERISTICS
PARAMETER
(Continued)
MIN.
TYP.
140
280
420
550
250
420
600
780
700
880
1050
1220
2.4
V
DSET
×
0.98
V
DSET
×
1.02
MAX.
200
350
500
700
300
500
700
900
800
950
1150
1400
0.8
V
mV
UNIT
TEST CONDITIONS
I
L
=100mA
V
OUT
≥
3.3V
I
L
=200mA
I
L
=300mA
I
L
=400mA
I
L
=100mA
Dropout Voltage
(Note 6)
2.5V
≤V
OUT
<3.3V
I
L
=200mA
I
L
=300mA
I
L
=400mA
I
L
=100mA
I
L
=200mA
I
L
=300mA
I
L
=400mA
V
OUT
< 2.5V
SD2 Pin Voltage
V
SD
=Logic”0”
V
SD
=Logic”1”
Voltage Detector ( 3.0V ~ 4.6V with 0.1V step )
Detect Voltage(V
DET
)
Detect Threshold Hysteresis
V
DOUT
Delay Time
When V
DET
is Detected
When V
DET
is not Detected
CD Pin Open
1.65
1
3
V
DSET
V
DET
×
1.05
0.6
V
V
V
mS
Note 1: To avoid output oscillation, aluminum electrolytic output capacitor is recommended and ceramic
capacitor is not suggested.
Note 2: Specifications are production tested at T
A
=25°C. Specifications over the -40°C to 85°C
operating temperature range are assured by design, characterization and correlation with
Statistical Quality Controls (SQC).
Note 3: Guaranteed by design.
Note 4: Current limit is measured by pulsing a short time.
Note 5: Regulation is measured at constant junction temperature, using pulse testing with a low ON time.
Note 6: 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.
4
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