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PDF AIC164227ZBG Data sheet ( Hoja de datos )
| Número de pieza | AIC164227ZBG | |
| Descripción | 3-Pin One-Cell Step-Up DC/DC Converter | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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AIC1642
3-Pin One-Cell Step-Up DC/DC Converter
FEATURES
l A Guaranteed Start-Up from less than 0.9 V.
l High Efficiency.
l Low Quiescent Current.
l Less Number of External Components needed.
l Low Ripple and Low Noise.
l Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.
l Space Saving Packages: SOT-89 and TO-92
APPLICATIONS
l Pagers.
l Cameras.
l Wireless Microphones.
l Pocket Organizers.
l Battery Backup Suppliers.
l Portable Instruments.
DESCRIPTION
The AIC1642 is a high efficiency step-up
DC/DC converter for applications using 1 to 4
battery cells. Only three external components
are required to deliver a fixed output voltage of
2.7V, 3.0V, 3.3V, or 5V. The AIC1642 starts up
from less than 0.9V input with 1mA load. Pulse
Frequency Modulation scheme brings optimized
performance for applications with light output
loading and low input voltages. The output rip-
ple and noise are lower compared with the cir-
cuits operating in PSM mode.
The PFM control circuit operating in 100KHz
(max.) switching rate results in smaller passive
components. The space saving SOT-89 and
TO-92 packages make the AIC1642 is an ideal
choice of DC/DC converter for space conscious
applications, like pagers, electronic cameras,
and wireless microphones.
TYPICAL APPLICATION CIRCUIT
VIN
L1
100µH
D1
GS SS12
VOUT
+ C2
22µF SW
AIC1642-27
AIC1642-30
AIC1642-33
AIC1642-50
GND
VOUT
+ C1
47µF
One Cell Step-Up DC/DC Converter
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-1642-01 012102
1
1 page  
AIC1642
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
-40
-20
0
20 40 60 80 100
Temperature (°C)
Fig. 7 AIC1642-27 SW On Resistance vs. Temperature
52
48
44
40
36
32
28
24
20
-40
-20
0 20 40 60
Temperature (°C)
80 100
Fig. 8 AIC1642-27 Supply Current IDD1 vs. Temperature
3.1
3.0 VIN=2.0V
2.9
2.8
VIN=1.5V
VIN=.8V
2.7
2.6
2.5
2.4
VIN=1.2V
2.3
2.2
2.1 VIN=0.9
2.0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
Output Current (mA)
Fig. 9 AIC1642-30 Load Regulation (L=100µH CD54)
85
80
75
70 VIN=2.0V
65 VIN=1.8V
60 VIN=1.5V
55 VIN=1.2V
VIN=0.9V
50 0 20 40 60 80 100 120 140 160 180
Output Current (mA)
Fig. 10 AIC1642-30 Efficiency (L=100µH CD54)
1.0
0.9 Start up
0.8
0.7
0.6
0.5 Hold on
0.4
0.3
0.2
0.1
0.0
0 2 4 6 8 10 12 14 16 18 20
Output Current (mA)
Fig. 11 AIC1642-30 Start-up & Hold-on Voltage (L=100µH)
3.06
3.04
3.02 No Load
3.00
2.98
2.96
2.94
2.92
2.90
-40
-20
Fig. 12
0 20 40 60
Temperature (°C)
80 100
AIC1642-30 Output Voltage vs. Temperature
5
5 Page 
VEXT
IIN
IPK
ISW
ID
IOUT
VSW
t
Continuous Conduction Mode
Continuous Conduction Mode
At the boundary between continuous and dis-
continuous mode, output current (IOB) is deter-
mined by
IOB = VIN * 1 * VIN * TON * (1 − x)
VOUT 2 L
where Vd is the diode drop,
x = (RON + RS) * TON
L
RON= Switch turn on resistance, RS= Inductor
DC resistance
TON = Switch ON time
In the discontinuous mode, the switching fre-
quency (Fsw) is
Fsw = 2 * (L) * (VOUT + VD − VIN) * (IOUT) (1+ x)
VIN 2 × TON 2
AIC1642
In the continuous mode, the switching fre-
quency is
( )fSW = 1 VOUT + VD − VIN
TON (VOUT + VD − VSW)
* [1 + x ( VIN − VSW )]
2 VOUT + VD − VSW
≅ 1 VOUT + VD − VIN
TON VOUT + VD − VSW
where Vsw = switch drop and proportion to out-
put current.
Inductor Selection
To operate as an efficient energy transfer ele-
ment, the inductor must fulfill three require-
ments. First, the inductance must be low
enough for the inductor to store adequate en-
ergy under the worst case condition of minimum
input voltage and switch ON time. Second, the
inductance must also be high enough so maxi-
mum current rating of AIC1642 and inductor are
not exceed at the other worst case condition of
maximum input voltage and ON time. Lastly, the
inductor must have sufficiently low DC resis-
tance so excessive power is not lost as heat in
the windings. But unfortunately this is inversely
related to physical size.
Minimum and maximum input voltage, output
voltage and output current must be established
in advance and then inductor can be selected.
In discontinuous mode operation, at the end of
the switch ON time, peak current and energy in
the inductor build according to
IPK = VIN * 1 − exp(− RON + Rs * TON)
RON + Rs
L
≅ VIN * (TON) * 1 − x
L
2
≅ VIN TON
L
(simple loss equation),
where x = (RON + RS) * TON
L
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AIC164227ZBG.PDF ] | |
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