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PDF AIC1639 Fiche technique - aic

Numéro de référence AIC1639
Description 3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
Fabricant aic 
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AIC1639 Datasheet, Description
AIC1639
FEATURES
l Guaranteed Start-Up from Below 0.9 V.
l High Efficiency.
l Low Quiescent Current.
l Few Number of External Components needed.
l Low Ripple and Low Noise.
l Fixed Output Voltage: 2.7, 3.0V, 3.3V, and 5V.
l Driver for External Transistor.
l Space Saving SOT-89 and TO-92 Packages.
APPLICATIONS
l Pagers.
l Cameras.
l Wireless Microphones.
l Pocket Organizers.
l Battery Backup Suppliers.
l Portable Instruments.
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1639-00 05/26/00
DESCRIPTION
The AIC1639 is a high efficiency step-up DC/DC
converter for applications using 1 to 4 battery cells.
Only three external components are required to de-
liver a fixed output voltage of 2.7, 3.0V, 3.3V, or 5V.
The AIC1639 starts up from below 0.9V input with
1mA load. Pulse Frequency Modulation scheme
brings optimized performance for applications with
light output loading and low input voltages. The out-
put ripple and noise are lower compared with the
circuits operating in PSM mode.
The PFM control circuit operating in 100KHz (max.)
switching rate results in smaller passive compo-
nents. The space saving SOT-89 and TO-92 pack-
ages make the AIC1639 an ideal choice of DC/DC
converter for space conscious applications, like
pagers, electronic cameras, and wireless micro-
phones.
Provided with an external transistor driver pin (EXT),
the AIC1639 is recommended for applications re-
quiring current as large as several tens to several
hundreds of milli-amperes.
TYPICAL APPLICATION CIRCUIT
VIN
+ C2
47µF
L1
33 µH
Q1
2SD1803
R1 300
EXT
10nF
D1
AIC1639-27
AIC1639-30
AIC1639-3 3
AIC1639-50
VOUT
+
GND
VOUT
C2
100µF
100mA Load Current Step-Up Converter
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F,9IndustryE.9thRoad,Science-basedIndustrialPark,Hsinchu,Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
1
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AIC1639 Fiche technique
AIC1639
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1639-00 05/26/00
n ELECTRICAL CHARACTERISTICS (AIC1639 Ta=25° C, IO=10mA, Unless otherwise
specified)
PARAMETER
Output Voltage
Input Voltage
Start-Up Voltage
Hold-on Voltage
No-Load Input Current
Supply Current 1
TEST CONDITIONS
VIN=1.8V
VIN=1.8V
VIN=2.0V
VIN=3.0V
IOUT=1mA, VIN:02V
IOUT=1mA, VIN:20V
IOUT =0mA
EXT at no load, VIN=VOUT x 0.5
Measurement of the IC input cur-
rent
SYMBOL
VOUT
VIN
VSTART
VHOLD
IIN
IDD1
MIN.
2.633
2.925
3.218
4.875
0.6
Supply Current 2
EXT “H” On-Resistance
EXT at no load, VIN=VOUT + 0.5
Measurement of the IC input cur-
rent
VEXT =VOUT – 0.4V
IDD2
REXTH
EXT “L” On-Resistance VEXT= 0.4V
REXTL
Oscillator Duty Cycle
Max. Oscillator Freq.
Efficiency
VIN=VOUT x 0.95
Measurement of the IC input cur-
rent
VIN=VOUT x 0.95
Measurement of the IC input cur-
rent
DUTY
FOSC
η
65
80
TYP.
2.700
3.000
3.300
5.000
0.8
18
45
50
60
80
7
300
200
185
130
110
80
70
60
75
105
80
MAX.
2.767
3.075
3.382
5.125
8
0.9
UNIT
V
V
V
V
µA
µA
µA
85
%
130
KHz
%
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F,9IndustryE.9thRoad,Science-basedIndustrialPark,Hsinchu,Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
3
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AIC1639 pdf
AIC1639
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1639-00 05/26/00
n TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
AIC1639-33 Start-up & Hold-on Voltage (L=33µH)
1.2
Start up
1.0
0.8
0.6
Hold on
0.4
0.2
0.0
0 20 40 60 80 100 120 140 160
Output Current (mA)
AIC1639-50 Start-up & Hold-on Voltage (L=33µH)
1.6
1.4
1.2 Start up
1.0
0.8
Hold on
0.6
0.4
0.2
0.0
0
20 40 60 80 100 120 140
Output Current (mA)
160
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
-40
AIC1639 Output Voltage vs Temperature
VOUT=5.0V
VOUT= 3.3V
VOUT= 3.0V
VOUT= 2.7V
-20 0 20 40 60 80
Output Current (mA)
100
135
130
125
120
115
110
105
100
95
90
85
-40
AIC1639 Switching Frequency vs Temperature
VOUT= 5.0V
VOUT= 3.3V
VOUT= 3.0V
VOUT= 2.7V
-20 0
20 40 60 80
Output Current (mA)
100
AIC1639 Maximum Duty Cyclevs Temperature
80
79
VOUT= 2.7V
78 VOUT= 3.0V
77 VOUT= 3.3V
VOUT= 5.0V
76
75
74
73
72
71
70
-40
-20
0 20 40 60
Output Current (mA)
80 100
AIC1639 Supply Current vs Temperature
80
75
VOUT= 5.0V
70 VOUT= 3.3V
65 VOUT= 3.0V
VOUT= 2.7V
60
55
50
45
40
35
30
-40
-20
0
20 40 60 80 100
Temperature (°C)
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F,9IndustryE.9thRoad,Science-basedIndustrialPark,Hsinchu,Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
6
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