AT1303
Preliminary Product Information
MicroPower Step-Up DC/DC Converter
Features
• Low Start-Up from below 1.0V
• Low Input Quiescent Current(Switching Off
Current for 3.3V output) : 60µA (typ.)
• High Output Voltage Accuracy
±2.0%
• Small Number of External Components needed
• Output Voltage from 1.2V to 5.5V
• Space Saving MSOP-8 or TSSOP8 package
General Description
The AT1303 is a high efficiency current mode
PWM step-up DC/DC converter with light load
control for applications using battery-powered
system. The device will automatically skip
switching cycles under light load condition to
maintain high efficiency at light load. The small
MSOP-8 or TSSOP-8 packages make the AT1303
an ideal choice of DC/DC Converter for space
conscious applications.
Applications
• Personal Digital Assistant (PDA)
• Digital Camera
• Portable Audio (MP3)
• Electronic Game
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
1
05/05/26
AT1303
Preliminary Product Information
MicroPower Step-Up DC/DC Converter
Pin Configuration
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Symbol
LBO
LBI
VCC
LX
PGND
GND
FB
/SHDN
I/O
O
I
P
O
P
P
I
I
Description
Low Battery Detected output (active Hi-Z)
Low Battery Detected input
Power Supply
Switching Pin
Power Ground
Ground
Error Amplifier Input
Chip Enable Input
Ordering Information
Part number
AT1303P
AT1303P_PBF
AT1303P_GRE
AT1303M
AT1303M_PBF
AT1303M_GRE
Package
TSSOP8
TSSOP8, Pb-Free
TSSOP8, Green
MSOP8
MSOP8, Pb-Free
MSOP8, Green
Marking
AT1303P
AT1303P, Date Code with one bottom line
AT1303P, Date Code with two bottom line
AT1303
AT1303, Date Code with one bottom line
AT1303, Date Code with two bottom line
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
2
05/05/26
AT1303
Preliminary Product Information
MicroPower Step-Up DC/DC Converter
Absolute Maximum Ratings
(T
a
=+25
0
C)
Parameter
Power supply voltage
LX pin voltage
LX pin output current
Allowable dissipation
Operating temperature
Storage temperature
Symbol
V
CC
V
LX
I
LX
P
D
T
OP
T
stg
Condition
—
—
—
TSSOP8
MSOP8
—
—
Rated Value
Min.
Max.
—
6.0
—
6.0
—
1.7
—
430
—
330
-30
+85
-55
+125
Unit
V
V
A
mW
mW
0
C
0
C
WARNING:
Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in
excess of absolute maximum ratings. Do not exceed these ratings.
Electrical Characteristics
(Ta=+25
0
C)
Parameter
Power Supply
Voltage
Input Voltage
Start-Up Voltage
Symbol
V
CC
V
IN
V
Start
I
2
Condition
Min.
2.5
1.5
Values
Typ.
-
-
1.0
60
100
1
1.220
380
90
0.23
1.4
0.8
1.0
70
7.5
170
Max.
5.5
5.5
1.1
70
110
5
1.244
-
95
0.26
1.7
1.2
1.02
90
-
-
Unit
V
V
V
μA
μA
μA
V
KHz
%
Ω
A
V
V
mV
mA
°C
I
OUT
=1mA V
IN
=0 2V
V
IN
= V
OUT
+0.5V(V
OUT
= 3.3V)
V
IN
= V
OUT
+0.5V(V
OUT
= 5.0V)
/SHDN=0V, V
IN
=5.5V
Close loop, V
OUT
=3.3V
V
OUT
=3.3V
V
OUT
=3.3V
V
OUT
=3.3V
-
50
90
-
1.200
-
85
0.2
1.0
0.4
0.98
50
-
-
Switch off Current
I
2
Shutdown Current
Feedback Reference
Switching
Frequency
Maximum Duty
LX ON Resistance
Current Limit
/SHDN Trip Level
LBI Trip Level
Hysteresis Width
(LBI Trip Level)
LBO/LD Sink
current
Thermal shutdown
I
Limit
I
3
V
REF
F
S
D
max
V
IN
= 2.0V , V
OUT
=3.3V, Duty=55%
V
OUT
=3.3V
VCC Falling
VCC Rising
I
LBO
LBO/LD=0.4V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
3
05/05/26
AT1303
Preliminary Product Information
MicroPower Step-Up DC/DC Converter
Thermal shutdown
Hysterises
-
20
-
°C
*Unless otherwise provided, V
IN
=1.5V (when V
OUT
=3.3V), and use External Circuit of Typical Application (Fig 1).
Typical Curve
(as Fig.1, Fig. 2) L=10µH/LYS6S28(LEE YU)
Efficiency for 3.3V Output
90
85
Efficiency
80
Vin
Vin
Vin
Vin
Vin
Vin
= 1.0V
= 1.5V
= 1.8V
= 2.0V
= 2.5V
= 3.0V
75
70
65
1
10
10
ILoad(mA)
2
10
3
Efficiency for 5.0V Output
92
90
88
86
Efficiency
84
82
80
78
76
1
10
Vin
Vin
Vin
Vin
Vin
Vin
= 1.0V
= 1.5V
= 1.8V
= 2.0V
= 3.0V
= 4.0V
10
ILoad(mA)
2
10
3
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
4
05/05/26
AT1303
Preliminary Product Information
MicroPower Step-Up DC/DC Converter
Efficiency for 3.3V Output (Vin=2.0V)
88
86
84
Efficiency
82
80
78
L = 3.3uH
L = 4.7uH
L = 10uH
L = 22uH
76
1
10
10
ILoad(mA)
2
10
3
Efficiency for 5.0V Output (Vin=2.0V)
90
88
86
84
Efficiency
82
80
78
76
74
72
1
10
2
3
L = 3.3uH
L = 4.7uH
L = 10uH
L = 22uH
10
ILoad(mA)
10
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
5
05/05/26
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