AIMTRON AT1310X

AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Features
General Description
• Step-Up type Charge Pump
• Input Range 2.7V to 5V
• Low input current 25µA
• High Output Voltage Accuracy ±4%
• 100mA output current with VIN≥3.0V
50mA output current with VIN≥2.7V
• High Frequency 750KHz operation
• SOT-26 Package
The AT1310 is a MicroPower switched-capacitor
voltage converter that delivers a regulated output.
No external inductor is required for operation.
Using three small capacitors, the AT1310 can
deliver up to 100mA to the regulated output. The
AT1310 features very low quiescent current and
high frequency over a large portion of its load
range making this device ideal for battery-powered
applications.
Applications
• Cellular Phones
• LED Backlight Driver
• DSC Flash Unit for IGBT trigger Level
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
1
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Pin Configuration(or Pin Assignment)
Ordering Information
Part number
AT1310X
AT1310X_PBF
Package
SOT-26
SOT-26, PBF
Marking
Date Code
,Date Code with one bottom line
: Date Code
*For more marking information, contact out sales representative directly
Pin Description
Pin No.
1
2
3
4
5
6
Symbol
OUT
GND
/SHDN
CN
VIN
CP
I/O
O
P
I
P
+
Description
Regulated Output
Ground
Chip Enable Input
Flying Capacitor negative terminal
Input Supply
Flying Capacitor positive terminal
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
2
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Absolute Maximum Ratings*1
(Ta=+250C)
Parameter
Power supply voltage
OUT pin voltage
SHDN pin voltage
Allowable dissipation
Operating temperature
Storage temperature
Symbol
Condition
VIN
VOUT
VSHDN
PD
TOP
Tstg
—
—
—
—
—
—
Rated Value
Min.
Max.
—
6.0
—
6.0
—
6.0
—
150
-30
+85
-55
+125
Unit
V
V
V
mW
0
C
0
C
1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
Parameter
Symbol
(Ta=+250C)
Condition
Min.
Values
Typ.
Max.
2.7
-
VOUT
V
Unit
Input Voltage
VIN
VOUT =5.0V
No Load Supply
Current
VStart
2.7V< VIN <5.0V,IOUT=0mA,
/SHDN=VIN
-
25
40
μA
5.0
5.2
V
VOUT
2.7V< VIN <5.0V ,IOUT≤50mA
4.8
Output Voltage
3.0V< VIN <5.0V ,IOUT≤100mA
4.8
5.0
5.2
V
-
-
1
μA
-
-
4
μA
VIN =3V, IOUT =50mA
-
25
-
mV
VIN =3V, IOUT =100mA
-
30
-
mV
VIN =3V, IOUT =50mA
-
83
-
%
VIN =2.7V, IOUT =50mA
-
92
-
%
Oscillator Free Running
-
750
-
KHz
VIH
1.4
-
-
V
VIL
-
-
0.3
V
Shutdown Current
Ripple Current
Efficency
Frequency
/SHDN Input
Threshold
ISHDN
VRipple
η
F
2.7V< VIN <3.6V ,IOUT=0mA,
/SHDN=0V
3.6V< VIN <5.0V ,IOUT=0mA,
/SHDN=0V
IIH
/SHDN= VIN
-2
-
2
μA
IIL
/SHDN= 0V
-2
-
2
μA
OUT Turn-ON time
tON
VIN =3V, IOUT =0mA
-
2
-
ms
Short-Circuit Current
ISC
VIN =3V,VOUT =GND,/SHDN=3V
-
300
-
mA
/SHDN Input Current
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
3
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Typical characteristics :
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
4
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
5
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Typical Application Schematic
Fig1. Typical Charge Pump Boost Converter Circuit
Fig2. 5V/100mA supply powered from a USB Port
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
6
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Fig3. LED Driver from a Li-Ion Battery Source
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
7
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Application Information
1. Capacitor Selection
It is very important to select the capacitors CIN, COUT and CFLY because they will affect turn
on time, output ripple and transient performance. Ceramic capacitors offer many advantages
over other tantalum and aluminum electrolytic counterparts. In general, the capacitors can
be used 10µF for CIN and COUT, and 1µF for CFLY under maximum output load conditions.
Lower values for CIN, COUT and CFLY may be utilized for light load current applications.
Large ceramic capacitors are typically composed of X7R, X5R, Z5U or Y5V dielectric
materials. If Y5V and Z5U are selected for used with the charge pump, the nominal value
should be doubled to compensated for the capacitor tolerance which can vary more than
±50% over operating temperature range. X7R and X5R dielectrics are much more desirable.
The temperature tolerance of X7R dielectric is better than ±15% .
2. Charge Pump Efficiency
The AT1310 is a regulated output voltage charger pump converter. The Efficiency can be
defined as a linear voltage regulator with an effective output voltage that is equal to two
times the input voltage. The expression to define the ideal efficiency can be shown as:
η=
POUT VOUT × I OUT
V
=
= OUT
PIN
VIN × 2 I OUT 2 × VIN
Refer to the Typical Characteristics section for measured plots of efficiency versus input
voltage and output load current for the given charge pump output voltage options.
3. Layout Guideline
As a general rule for charge pump boost converters, all external capacitors should be located
as closed as possible to the device package with minimum length trace connections. A local
component side ground plane is recommended. If this is not possible due to the layout
limitations, assure good ground connections by the use of large or multiple PCB via’s.
Refer to the following AT1310 evaluation board layout. ( Application Circuit Fig3.)
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
8
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
TopOverLayer
BottomLayer
TopLayer
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
9
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Small Outline SOT-26
SYMBOL
A
A1
A2
b
C
D
E
E1
L
e
e1
r
INCHES
MIN
0.035
0.000
0.035
0.010
0.003
0.110
0.102
0.059
0.014
00
MAX
0.057
0.006
0.051
0.020
0.008
0.122
0.118
0.069
0.022
0.037ref
0.075ref
100
MILLIMETERS
MIN
MAX
0.90
1.45
0.00
0.15
0.90
1.30
0.25
0.50
0.08
0.20
2.80
3.10
2.60
3.00
1.50
1.75
0.35
0.55
0.95ref
1.90ref
00
100
NOTES
-
-
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
10
AT1310
Preliminary Product Information
MicroPower Charge Pump Converter
Reflow Profiles
Profile Feature
Sn-Pb Eutectic Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
<2.5mm or Pkg.
≥2.5mm or Pkg.
3
volume ≥350mm3 volume <350mm
Average ramp-up rate
(TL to TP)
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
Tsmax to TL
-Ramp-up Rate
Time maintained above:
-Temperature (TL)
-Time (tL)
Peak Temperature(TP)
Time within 5°C of actual Peak
Temperature (tP)
Ramp-down Rate
Time
25°C
to
Peak
Temperature
3°C/second max.
Pb-Free Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
≥2.5mm or Pkg.
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
3°C/second max.
183°C
60-150 seconds
217°C
60-150 seconds
225+0/-5°C
10-30 seconds
240+0/-5°C
10-30 seconds
6°C/second max.
6 minutes max.
245+0/-5°C
10-30 seconds
250+0/-5°C
20-40 seconds
3°C/second max.
8 minutes max.
*All temperatures refer to topside of the package, measured on the package body surface.
7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
11