AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
1
FEATURES
!
Guaranteed Start-Up from below 0.9 V.
!
High Efficiency.
!
Low Quiescent Current.
!
Few Number of External Components needed.
!
Low Ripple and Low Noise.
!
Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.
!
Space Saving SOT-89 and TO-92 Packages.
APPLICATIONS
!
Pagers.
!
Cameras.
!
Wireless Microphones.
!
Pocket Organizers.
!
Battery Backup Suppliers.
!
Portable Instruments.
DESCRIPTION
The AIC1638 is a high efficiency step-up DC/DC
converter for applications using 1 to 4 NiMH battery
cells. Only three external components are required to
deliver a fixed output voltage of 2.7V, 3.0V, 3.3V, or
5V. The AIC1638 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 output
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
components. The space saving SOT-89 and TO-92
packages make the AIC1638 an ideal choice of
DC/DC converter for space conscious
applications, like pagers, electronic cameras, and
wireless microphones
TYPICAL APPLICATION CIRCUIT
D1
VOUT
SW
GND
AIC1638-27
AIC1638-30
AIC1638-33
AIC1638-50
C1
22
F
+
V
OUT
L1
88
H
V
IN
+
C2
47
F
One Cell Step-Up DC/DC Converter
AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
2
ORDERING INFORMATION
ORDER NUMBER
AIC1638-27CX
AIC1638-30CX
AIC1638-33CX
AIC1638-50CX
(SOT-89)
AIC1638-27CZ
AIC1638-30CZ
AIC1638-33CZ
AIC1638-50CZ
(TO-92)
PIN CONFIGURATION
TOP VIEW
1: GND
2: VOUT
3: SW
1
2
3
1
2
3
TOP VIEW
1: GND
2: VOUT
3: SW
AIC1638- XXX
PACKAGE TYPE
X: SOT-89
Z: TO-92
TEMPERATURE RANGE
C: -20
C
+80
C
OUTPUT VOLTAGE
27: 2.7V
30: 3.0V
33: 3.3V
50: 5.0V
ABSOLUATE MAXIMUM RATINGS
Supply Voltage
.....................................................................................12V
SW pin Voltage ............................................................................................12V
SW pin Switch Current ..............................................................................0.6A
Power Dissipation .................................................................................500mW
Operating Temperature Range ..........................................................-20
C to 80
C
Storage Temperature Range ......................................................... -65
C to 150
C
Lead Temperature (Sordering 10 Sec.) .........................................................260
C
TEST CIRCUIT
F
OUT
AIC1638
2.5V
VOUT
SW
GND
100
Oscillator Test Circuit
AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
3
"
ELECTRICAL CHARACTERISTICS
(Ta=25
C, I
O
=10mA, Unless otherwise specified)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Output Voltage
V
IN
=1.8V
V
IN
=1.8V
V
IN
=2.0V
V
IN
=3.0V
V
OUT
2.633
2.925
3.218
4.875
2.700
3.000
3.300
5.000
2.767
3.075
3.382
5.125
V
Input Voltage
V
IN
8
V
Start-Up Voltage
I
OUT
=1mA, V
IN
:0
2V
V
START
0.8
0.9
V
Min. Hold-on Voltage
I
OUT
=1mA, V
IN
:2
0V
V
HOLD
0.7
V
No-Load Input Current
I
OUT
=0mA
I
IN
15
A
Supply Current
V
IN
=V
OUT
x 0.95
Measurement of the IC input
current
I
DD1
42
50
60
90
A
Supply Current
V
IN
=V
OUT
+ 0.5V
Measurement of the IC input
current
I
DD2
7
A
SW Leakage Current
V
S
W
=10V, V
IN
=V
OUT
+ 0.5V
0.5
A
SW Switch-On
Resistance
V
IN
=V
SW
x 0.95, V
SW
=0.4V
R
ON
1.3
1.2
1.1
1
Oscillator Duty Cycle
V
IN
=V
OUT
x 0.95
Measurement of the IC input
current
DUTY
65
75
85
%
Max. Oscillator Freq.
V
IN
=V
OUT
x 0.95
Measurement of the IC input
current
F
OSC
80
105
130
KHz
Efficiency
85
%
AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
4
"
TYPICAL PERFORMANCE CHARACTERISTICS
Capacitor (C1) : 47
F (Tantalum Type)
Diode (D1) : 1N5819 Schottky Type
AIC1638-27 Load Regulation
(L=100
H CD54)
0
20
40
60
80
100
120
140
160
180
2.2
2.3
2.4
2.5
2.6
2.7
2.8
V
IN
=2.0V
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
O
u
t
put voltage
(
V
)
Output Current (mA)
AIC1638-27 Efficiency (L=100
H CD54)
0
20
40
60
80
100
120
140
160
180
55
60
65
70
75
80
85
V
IN
=2.0V
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
E
ffic
i
ency (%
)
Output current (mA)
AIC1638-27 Load Regulation (
L=47
H CD54)
0
20
40
60
80
100
120
140
160
180
200
220
240
2.3
2.4
2.5
2.6
2.7
2.8
V
IN
=2.0V
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
O
u
t
put
vol
t
a
g
e
(
V
)
Output Current (mA)
240
85
AIC1638-27 Efficiency (L=47
H CD54)
E
f
f
i
c
i
en
cy (
%
)
Output current (mA)
0
20
40
60
80
100
120
140
160
180
200
220
50
55
60
65
70
75
80
V
IN
=2.0V
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
AIC1638-27 Start-Up & Hold-ON Voltage (L=47
H)
0
2
4
6
8
10
12
14
16
18
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Start up
Hold on
I
n
p
u
t V
o
lt
age (
V
)
Output Current (mA)
AIC1638-27
Start-Up & Hold-ON Voltage
(L=100
H)
0
2
4
6
8
10
12
14
16
18
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Start up
Hold on
In
p
u
t V
o
l
t
age
(
V
)
Output Current (mA)
AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
5
"
TYPICAL PERFORMANCE CHARACTERISTICS
(CONTINUED)
Temperature (
C)
-40
-20
0
20
40
60
80
100
2.62
2.64
2.66
2.68
2.70
2.72
2.74
2.76
2.78
AIC1638-27 Output Voltage vs Temperature
No Load
Ou
tpu
t
V
o
l
t
ag
e
V
out
(
V
)
-40
-20
0
20
40
60
80
100
20
40
60
80
100
120
140
160
AIC1638-27 Switching Frequency vs Temperature
S
witch
i
n
g
Fr
e
q
u
e
n
cy (
k
H
z
)
Temperature (
C)
-40
-20
0
20
40
60
80
100
66
68
70
72
74
76
78
80
82
AIC1638-27 Maximum Duty Cycle vs Temperature
Ma
x
i
mu
m D
u
t
y
C
y
c
l
e
(
%
)
Temperature (
C)
-40
-20
0
20
40
60
80
100
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
AIC1638-27 SW On Resistance vs Temperature
S
W
T
u
r
n
On
Re
si
st
a
n
c
e
(
)
Temperature (
C)
-40
-20
0
20
40
60
80
100
20
24
28
32
36
40
44
48
52
AIC1638-27 Supply Current vs Temperature
S
upp
ly
C
u
r
r
en
t I
D
D
1
(
u
A
)
Temperature (
C)
0
10
20
30
40
50
60
70
80
90
100 110 120 130 140
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
2.0V
1.8V
1.5V
1.2V
V
IN
=0.9V
AIC1638-30 Load Regulation (L=100
H, CD54)
Outpu
t vo
lt
age V
OU
T
(V)
Output Current (mA)
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