概述
数据手册AIC164227XBG 概述
3-Pin One-Cell Step-Up DC/DC Converter 3引脚单节升压型DC / DC转换器
AIC164227XBG 数据手册
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PDF下载AIC1642
3-Pin One-Cell Step-Up DC/DC Converter
■
■
FEATURES
DESCRIPTION
A Guaranteed Start-Up from less than 0.9 V.
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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.
High Efficiency.
Low Quiescent Current.
Less Number of External Components needed.
Low Ripple and Low Noise.
Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.
Space Saving Packages: SOT-89 and TO-92
■ APPLICATIONS
Pagers.
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Cameras.
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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.
Wireless Microphones.
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Pocket Organizers.
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Battery Backup Suppliers.
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Portable Instruments.
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■
TYPICAL APPLICATION CIRCUIT
VIN
VOUT
D1
GS SS12
L1
100mH
AIC1642-27
AIC1642-30
AIC1642-33
AIC1642-50
+
+
C1
47mF
C2
22mF
SW
VOUT
GND
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
AIC1642
■
ORDERING INFORMATION
AIC1642-XXCXXX
PIN CONFIGURATION
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
SOT-89
TOP VIEW
1: GND
2: VOUT
3: SW
BG: BAG
PACKAGE TYPE
X: SOT-89
1
2
3
Z: TO-92
OUTPUT VOLTAGE
27: 2.7V
30: 3.0V
33: 3.3V
50: 5.0V
1
2
3
TO-92
TOP VIEW
1: GND
2: VOUT
3: SW
Example: AIC1642-27COTR
à2.7V Version, in MSOP8 Package
& Tape & Reel Packing Type
■
ABSOLUATE MAXIMUM RATINGS
Supply Voltage ……………………………………………………………………………….12V
SW pin Voltage ……………………………………………………………………………….12V
SW pin Switch Current ………………………………………………………………………0.6A
Operating Temperature Range ………………………………..…………….… .--40°C to 85°C
Storage Temperature Range ………………………………………………… -65°C to 150 °C
Lead Temperature (Soldering 10 Sec.) …………………………………………………260°C
■
TEST CIRCUIT
AIC1642
100
FOUT
2.5V
VOUT
SW
GND
Oscillator Test Circuit
2
AIC1642
ELECTRICAL CHARACTERISTICS
specified)
(TA=25°C, IOUT=10mA, Unless otherwise
n
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
2.633
2.925
3.218
4.875
TYP.
2.700
3.000
3.300
5.000
MAX. UNIT
2.767
V =1.8V, AIC1642-27
IN
V =1.8V, AIC1642-30
3.075
IN
Output Voltage
V
OUT
V
V =2.0V, AIC1642-33
3.382
IN
V =3.0V, AIC1642-50
5.125
IN
8
Input Voltage
V
V
V
IN
V
START
0.8
0.9
0.7
Start-Up Voltage
Hold-on Voltage
No-Load Input Current
I
I
I
=1mA, V :0® 2V
OUT
OUT
OUT
IN
=1mA, V :2® 0V
V
V
IN
HOLD
15
42
50
60
90
=0mA
I
IN
mA
AIC1642-27
AIC1642-30
AIC1642-33
AIC1642-50
Supply Current
I
I
mA
DD1
V =V
x 0.95
IN
OUT
Measurement of the IC input
current (VOUT pin)
V =V
+ 0.5V
IN
OUT
8
Supply Current
mA
mA
DD2
Measurement of the IC input
current (VOUT pin)
0.5
SW Leakage Current
VSW=10V, VIN=VOUT + 0.5V
AIC1642-27
AIC1642-30
AIC1642-33
AIC1642-50
2.2
2.1
2.0
1.9
SW Switch-On Resis-
tance
R
W
ON
V =V
x 0.95, V =0.4V
SW
IN
SW
V =V
x 0.95
IN
OUT
65
80
75
85
Oscillator Duty Cycle
DUTY
%
Measurement of the SW Pin
Waveform
V =V
x 0.95
IN
OUT
105
80
130
Max. Oscillator Freq.
Efficiency
F
KHz
%
OSC
Measurement of the SW Pin
Waveform
h
3
AIC1642
TYPICAL PERFORMANCE CHARACTERISTICS
n
Capacitor (C1) : 47 m F (Tantalum Type)
Diode (D1) : 1N5819 Schottky Type
85
2.8
80
2.7
VIN=2.0V
75
2.6
V =1.8V
IN
VIN=1.5V
VIN=2.0V
V =1.2V
IN
70
65
60
55
V =1.8V
IN
2.5
2.4
2.3
2.2
V =1.5V
IN
VIN=1.2V
V =0.9V
IN
VIN=0.9V
0
20
40
60
80
100
120
140
160
180
0
20
40
60
80
100
120
140
160
180
Output Current (mA)
Output current (mA)
Fig. 2 AIC1642-27 Efficiency (L=100mH CD54)
Fig. 1 AIC1642-27 Load Regulation (L=100mH CD54)
1.0
2.78
2.76
2.74
2.72
2.70
2.68
2.66
2.64
2.62
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Start up
No Load
Hold on
0
2
4
6
8
10
12
14
16
18
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 4 AIC1642-27 Output Voltage vs. Temperature
Output Current (mA)
Fig. 3 AIC1642-27 Start-up & Hold-on Voltage (L=100mH)
82
80
78
76
74
72
70
68
66
160
140
120
100
80
60
40
20
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 6 AIC1642-27 Maximum Duty Cycle vs. Temperature
Temperature (°C)
Fig. 5 AIC1642-27 Switching Frequency vs. Temperature
4
AIC1642
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
n
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
52
48
44
40
36
32
28
24
20
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 8 AIC1642-27 Supply Current IDD1 vs. Temperature
Temperature (°C)
Fig. 7 AIC1642-27 SW On Resistance vs. Temperature
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
85
VIN=2.0V
80
75
70
65
60
55
50
VIN=.8V
VIN=1.5V
VIN=2.0V
VIN=1.8V
VIN=1.2V
VIN=1.5V
VIN=1.2V
VIN=0.9V
VIN=0.9
0
10 20 30 40 50 60 70 80 90 100 110 120 130 140
0
20
40
60
80
100
120
140
160
180
Output Current (mA)
Output Current (mA)
Fig. 9 AIC1642-30 Load Regulation (L=100mH CD54)
Fig. 10 AIC1642-30 Efficiency (L=100mH CD54)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
3.06
3.04
3.02
3.00
2.98
2.96
2.94
2.92
2.90
Start up
No Load
Hold on
0.00
2
4
6
8
10
12
14
16
18
20
-40
-20
0
20
40
60
80
100
Output Current (mA)
Temperature (°C)
Fig. 12 AIC1642-30 Output Voltage vs. Temperature
Fig. 11 AIC1642-30 Start-up & Hold-on Voltage (L=100mH)
5
AIC1642
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
n
160
140
120
100
80
82
80
78
76
74
72
70
68
66
60
40
20
0
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 13 AIC1642-30 Switching Frequency vs. Temperature
Temperature (°C)
Fig. 14 AIC1642-30 Maximum Duty Cycle vs. Temperature
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
52
48
44
40
36
32
28
24
20
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 16 AIC1642-30 Supply Current vs. Temperature
Temperature (°C)
Fig. 15 AIC1642-30 SW On Resistance vs. Temperature
90
85
80
75
70
65
60
55
50
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
V
=2.0V
IN
V
=1.8
IN
V
IN
=2.0V
V
=1.5V
IN
V
=1.2
IN
V
=1.8V
IN
V
=1.5V
IN
V
=1.2V
IN
V
=0.9
V
=0.9V
IN
IN
0
25
50
75
100
125
150
175
200
0
25
50
75
100
125
150
175
200
Output Current (mA)
Fig. 18 AIC1642-33 Efficiency (L=100mH CD54)
Output Current (mA)
Fig. 17 AIC1642-33 Load Regulation (L=100mH CD54)
6
AIC1642
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
n
1.1
3.50
1.0
3.45
0.9
Start up
3.40
0.8
3.35
No Load
0.7
3.30
0.6
3.25
0.5
3.20
0.4
3.15
3.10
3.05
0.3
0.2
0.1
Hold on
0.0
3.00
0
20
40
60
80
100
-
-
20
0
2
4
6
8
10
12
14
16
18
20
40
Temperature (°C)
Fig. 20 AIC1642-33 Output Voltage vs. Temperature
Output Current (mA)
Fig. 19 AIC1642-33 Start-up & Hold-on Voltage (L=100mH)
150
82
80
78
76
74
72
70
68
66
140
130
120
110
100
90
80
70
60
50
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
°
Temperature ( C)
Fig. 21 AIC1642-33 Switching Frequency vs. Temperature
Fig. 22 AIC1642-33 Maximum Duty Cycle vs. Temperature
60
56
52
48
44
40
36
32
28
24
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
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 24 AIC1642-33 Supply Current vs. Temperature
Temperature (°C)
Fig. 23 AIC1642-33 SW On Resistance vs. Temperature
7
AIC1642
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
n
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
90
85
80
75
70
65
60
55
50
45
V
=3.0V
IN
V
=2.0V
IN
V
=3.0V
IN
V
=2.0V
IN
V
=1.5V
IN
V =1.5V
IN
V
=1.2V
IN
V
=0.9V
IN
V
=0.9
V
=1.2
IN
IN
0
50
100
150
200
250
300
350
400
0
50
100
150
200
250
300
350
400
Output Current (mA)
Output Current (mA)
Fig. 25 AIC1642-50 Load Regulation ( L=100mH CD54)
Fig. 26 AIC1642-50 Efficiency (L=100mH, CD54)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
No Load
Start up
Hold on
0
2
4
6
8
10
12
14
16
18
20
-40
-20
0
20
40
60
80
100
Output Current (mA)
Fig. 27 AIC1642-50 Start-up & Hold-on Voltage (L=100mH)
Temperature (°C)
Fig. 28 AIC1642-50 Output Voltage vs. Temperature
82
80
78
76
74
72
70
68
66
64
150
140
130
120
110
100
90
80
70
60
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 29 AIC1642-50 Switching Frequency vs. Temperature
Temperature (°C)
Fig. 30 AIC1642-50 Maximum Duty Cycle vs. Temperature
8
AIC1642
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
n
100
90
80
70
60
50
40
30
20
10
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
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig. 31 AIC1642-50 SW On Resistance vs. Temperature
°
Temperature ( C)
Fig. 34 AIC1642-50 Supply Current vs. Temperature
■
BLOCK DIAGRAM
SW
1.25V REF.
VOUT
1M
-
+
Enable
OSC, 100KHz
GND
■
PIN DESCRIPTIONS
PIN1 : GND - Ground. Must be low imped-
ance; sorer directly to ground
plane.
PIN3 : SW – Internal drain of N-MOSFET
switch.
PIN2 : VOUT - IC supply pin. Connect VOUT
to the regulator output.
9
AIC1642
■
APPLICATION INFORMATION
tinuous conduction mode. Continuous conduction
mode means that the inductor current does not
ramp to zero during each cycle.
GENERAL DESCRIPTION
AIC1642 PFM (pulse frequency modulation) control-
ler ICs combine a switch mode regulator, N-channel
power MOSFET, precision voltage reference, and
voltage detector in a single monolithic device. They
offer extreme low quiescient current, high efficiency,
and very low gate threshold voltage to ensure start-
up with low battery voltage (0.8V typ.). Designed to
maximize battery life in portable products, and
minimize switching losses by only switching as
needed service the load.
VIN
IIN
ID
IOUT
SW
VOUT
+
EXT
Isw
Ico
PFM controllers transfer a discrete amount of en-
ergy per cycle and regulate the output voltage by
modulating switching frequency with the constant
turn-on time. Switching frequency depends on load,
input voltage, and inductor value, and it can range
up to 100KHz. The SW on-resistance is typically 1.9
to 2.2W to minimize switch losses.
VEXT
IIN
IPK
When the output voltage drops, the error compara-
tor enables 100kHz oscillator that turns on the
MOSFET around 7.5us and 2.5us off time. Turning
on the MOSFET allows inductor current to ramp up,
storing energy in a magnetic field. When MOSFET
turns off that force inductor current through diode to
the output capacitor and load. As the stored energy
is depleted, the current ramp down until the diode
turns off. At this point, inductor may ring due to re-
sidual energy and stray capacitance. The output ca-
pacitor stores charge when current flowing through
the diode is high, and release it when current is low,
thereby maintaining a steady voltage across the
load.
ISW
Charge Co.
ID
IOUT
TDIS
Discharge Co.
VSW
t
Discontinuous Conduction Mode
As the load increases, the output capacitor dis-
charges faster and the error comparator initiates cy-
cles sooner, increasing the switching frequency.
The maximum duty cycle ensure adequate time for
energy transfer to output during the second half
each cycle. Depending on circuit, PFM controller
can operate in either discontinuous mode or con-
10
AIC1642
In the continuous mode, the switching fre-
quency is
VEXT
1
VOUT + VD - VIN
TON (VOUT + VD - VSW)
VIN - VSW
2 VOUT + VD - VSW
VOUT + VD - VIN
fSW =
IIN
IPK
x
* [1+
(
)]
1
æ
ö
@
ç
÷
TON VOUT + VD - VSW
è
ø
ISW
where Vsw = switch drop and proportion to out-
put current.
ID
IOUT
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.
VSW
t
Continuous Conduction Mode
Continuous Conduction Mode
At the boundary between continuous and dis-
continuous mode, output current (I ) is deter-
OB
mined by
Minimum and maximum input voltage, output
voltage and output current must be established
in advance and then inductor can be selected.
VIN
1
2
IOB =
*
*
VIN * TON * (1- x)
æ
ö
÷
ø
ç
VOUT
L
è
In discontinuous mode operation, at the end of
the switch ON time, peak current and energy in
the inductor build according to
where Vd is the diode drop,
TON
x = (RON + RS) *
L
VIN
RON + Rs
æ
ö æ
ö
÷
IPK =
* 1- exp(-
* TON)
ç
÷ ç
R
= Switch turn on resistance, R = Inductor
ON S
RON + Rs
L
è
ø è
ø
DC resistance
VIN
x
æ
ö
æ
ö
÷
T
= Switch ON time
@
*
(
TON
)
* 1-
ç
÷
ø
ç
ON
L
2
è
è
ø
In the discontinuous mode, the switching fre-
quency (Fsw) is
@
VIN TON
(simple loss equation),
L
2 * (L) * (VOUT + VD - VIN) * (IOUT)
Fsw =
(1+ x)
2
2
TON
VIN ´ TON
where x = (RON + RS) *
L
11
AIC1642
1
VOUT+VD- VSW x
VIN- VSW
x
æ
ö
æ
ö
æ
ö
÷
ø
E = L ´ Ipk2
IPK=
-
*IOUT+
*TON * 1-
ç
è
÷
ç
è
÷
ç
L
VIN- VSW
2
2L
2
ø
ø
è
2
Power required from the inductor per cycle must
be equal or greater than
Valley current (Iv) is
1
VOUT+VD- VSW x
VIN- VSW
x
æ
ö
æ
ö
æ
ö
÷
ø
PL/fSW = (VOUT + VD - VIN) * (IOUT) * (
)
IV =
-
*IOUT-
*TON* 1-
ç
è
÷
ç
è
÷
ç
fsw
VIN- VSW
2
2L
2
ø
ø
è
In order for the converter to regulate the output.
When loading is over IOB, PFM controller oper-
ates in continuous mode. Inductor peak current
can be derived from
Table 1 Indicates resistance and height for each coil.
Inductance
Rated Current
Height
(mm)
Power Inductor Type
Resistance ( W )
( mH )
(A)
0.7
0.5
0.3
2.7
1.8
0.7
0.5
0.7
0.5
1.2
22
0.10
0.18
0.38
0.08
0.14
0.25
0.50
0.25
0.50
0.11
DS1608
DO3316
2.9
47
100
22
Coilcraft SMT Type
(www.coilcraft.com)
5.2
4.5
47
47
Sumida SMT Type CD54
100
47
Hold SMT Type PM54
Hold SMT Type PM75
4.5
5.0
100
33
Capacitor Selection
Most of the input supply is supplied by the input
bypass capacitor, the capacitor voltage rating
should be at least 1.25 times greater than a
maximum input voltage.
A poor choice for an output capacitor can result in
poor efficiency and high output ripple. Ordinary
aluminum electrolytic, while inexpensive may
have unacceptably poor ESR and ESL. There are
low ESR aluminum capacitors for switch mode
DC-DC converters which work much well than
general unit. Tantalum capacitors provide still bet-
ter performance at more expensive. OS-CON ca-
pacitors have extremely low ESR in a small size.
If capacitance is reduced, output ripple will in-
crease.
Diode Selection
Speed, forward drop, and leakage current are the
three main considerations in selecting a rectifier
diode. Best performance is obtained with Schot-
tky rectifier diode such 1N5819. Motorola makes
MBR0530 in surface mount. For lower output
power a 1N4148 can be used although efficiency
and start-up voltage will suffer substantially.
12
AIC1642
V = Diode drop.
D
Component Power Dissipation
The power dissipated in a switch loss is
Operating in discontinuous mode, power loss in
the winding resistance of inductor can be ap-
proximate equal to
2 TON
VOUT + VD - VIN
æ
ö
÷
ø
æ
ö
÷
ø
PDSW =
*
(
RON
)
*
*
(
POUT
)
ç
ç
è
3
L
VOUT
è
The power dissipated in rectifier diode is
2 TON
VOUT + VF
æ
ö
÷
æ
ö
÷
ø
PDL
=
*
(
RD
)
*
*
(
POUT
)
ç
ç
è
3
L
VOUT
è
ø
VD
æ
ö
÷
PDd =
*
(
POUT
)
ç
VOUT
è
ø
where P =V
OUT
* I
; R =Inductor DC R;
OUT S
OUT
■
PHYSICAL DIMENSIONS
l
SOT-89 (unit: mm)
A
D
SYMBOL
MIN
1.40
0.36
0.35
4.40
1.62
2.29
MAX
1.60
0.48
0.44
4.60
1.83
2.60
D1
A
B
C
C
D
H
E
D1
E
L
e
1.50 (TYP.)
3.00 (TYP.)
B
e
e1
H
e1
3.94
0.89
4.25
1.20
L
l
SOT-89 MARKING
Part No.
Marking
AM27
AM30
AM33
AM50
AIC1642-27
AIC1642-30
AIC1642-33
AIC1642-50
13
AIC1642
l TO-92 (unit: mm)
SYMBOL
MIN
4.32
MAX
5.33
E
L
A
A
C
C
0.38 (TYP.)
e1
D
4.40
3.17
5.20
4.20
D
E
e1
1.27 (TYP.)
14
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