AIC1633
2-Cell, 200mA, Step-Up DC/DC Converter
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-1633-03 Mar 15, 00
TEL: 886-3-5772500
FAX: 886-3-5772510
1
FEATURES
High Efficiency Up To 87%.
Adjustable Output Voltage with Two Resistors
(AIC1633A)
Power-Saving Shutdown Mode (7
A typical).
Internal 0.8A Switch.
120KHz Switching Rate.
Adjustable Switch Current Limit.
On-Chip Low Battery Detector.
APPLICATIONS
Pocket Organizers.
Electronic Dictionaries.
Cameras.
Pagers.
Bar-Code Scanners.
LCD Displays.
Battery Backup Supplies.
Portable Instruments.
DESCRIPTION
The AIC1633 is a high efficiency step up DC/DC
converter. Only four external components are
required to deliver a fixed voltage of 3V, 3.3V, or
5V. The output voltage can be externally set to
an arbitrary value below breakdown voltage of
the power switch for AIC1633A. Efficiency
beyond 83% can be easily achieved at 70mA
load with 2.2V to 3V input voltages.
Logic-controlled shutdown mode is provided for
power saving. Switch current limit can be
programmed with a resistor. The low battery
detector can be configured as a linear regulator
or a burst mode controller performing an
extremely low supply current operation.
120KHz switching rate reduces the inductor size.
Inductors of 47
H to 150H inductance are
recommended for most applications.
TYPICAL APPLICATION CIRCUIT
AIC1633
100
H
L
+V
OUT
(3.3V)
LOAD
22
F
C1
22
F
C2
TATAN
NORMAL
R
ILIM
SD
ILIM/SD
VOUT
VIN
LBI
SW
LBO
SGND
CGND
1N5819
D1
+
+
470
R1
10K
+V
IN
NOTE: V
IN
1.8V, V
OUT
7V
High-Efficiency Step-Up DC/DC Converter
AIC1633
2
ORDERING INFORMATION
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0
C~+70C
OUTPUT VOLTAGE
DEFAULT: 3.3V
3: 3.0V
5: 5.0V
A: Adjustable
ORDER NUMBER
AIC1633CN
AIC1633-3CN
AIC1633-5CN
(PLASTIC DIP
)
PIN CONFIGURATION
AIC1633CS
AIC1633-3CS
AIC1633-5CS
(PLASTIC SO)
TOP VIEW
LBO
1
3
4
2
8
6
5
7
VOUT
VIN
SW
SGND
LBI
CGND
ILIM/SD
AIC1633ACN
(PLASTIC DIP
)
AIC1633ACS
(PLASTIC SO)
TOP VIEW
LBO
1
3
4
2
8
6
5
7
VOUT
VIN
SW
GND
LBI
FB
ILIM/SD
AIC1633 XXX
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................................................................ 7.0V
Operating Temperature Range .................................................................... -20
C ~ 80C
Storage Temperature Range ................................................................. -65
C ~ 150C
TEST CIRCUIT
Refer to Typical Application Circuit.
ELECTRICAL CHARACTERISTICS
(V
IN
=3.0V, Ta=25
C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Input Voltage
1.8
7
V
Output Voltage
I
LOAD
=70mA
AIC1633
AIC1633-3
AIC1633-5
3.16
2.88
4.80
3.3
3
5
3.44
3.12
5.20
V
Switch off Current
105
140
A
No Load Current
AIC1633/AIC1633-3
AIC1633-5
160
250
A
Shutdown Mode Current
7
15
A
Shutdown Recovery Time
V
IN
=2.5V, I
LOAD
=70mA
1.8
mS
AIC1633
3
ELECTRICAL CHARACTERISTICS
(CONTINUED)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Efficiency
I
LOAD
=70mA
AIC1633/AIC1633-3
AIC1633-5
87
86
%
Line Regulation
I
LOAD
=40mA
AIC1633, V
IN
=2.0~3.3V
AIC1633-3, V
IN
=2.0~3.0V
AIC1633-5, V
IN
=2.2~4.5V
0.6
0.6
0.5
%V
OUT
Load Regulation
I
LOAD
=170mA
AIC1633/AIC1633-3
AIC1633-5
0.6
0.5
%V
OUT
Oscillator Frequency
90
120
150
KHz
LBI Pin Trip Point
1.17
1.22
1.27
V
FB Threshold Voltage
AIC1633A
0.598
0.617
0.636
V
SW "ON Resistance"
AIC1633/AIC1633-3
AIC1633-5
1.75
1.25
LBO "ON Resistance"
V
IN
=2V
45
SW Off Leakage
1
A
Input Pin Bias Current
10
nA/Pin
Output Pin Leakage
10
nA/Pin
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Voltage vs Current
I
SW
(A)
V
SW
(V
)
0
0.5
1
1.5
2
2.5
0
0.5
1
1.5
2
2.5
3
Ta = 25
C
AIC1633-5
AIC1633/AIC1633-3
SW ON Resistance vs Temperature
Temperature (
C)
0
10
20
30
40
50
60
70
80
1
1.2
1.4
1.6
1.8
2
AIC1633-5
AIC1633/AIC1633-3
SW
R
DS O
N
(
)
AIC1633
4
TYPICAL PERFORMANCE CHARACTERISTICS
(CONTINUED)
No Load Supply Current vs Input Voltage
1
1.5
2
2.5
3
3.5
4
4.5
5
140
160
180
200
220
240
260
280
Ta = 25
C
AIC1633/AIC1633-3
AIC1633-5
V
IN
(V)
I
S
(
A)
No Load Supply Current vs Temperature
Temperature (
C)
IS
(
A)
0
10
20
30
40
50
60
70
80
100
140
180
220
260
300
AIC1633/AIC1633-3
AIC1633-5
V
IN
=3V
Shutdown Mode Supply Current vs Input Voltage
1
1.5
2
2.5
3
3.5
4
4.5
5
7
7.2
7.4
7.6
7.8
8
8.2
Ta = 25
C
V
IN
(V)
I
S
(
A)
Shutdown Mode Supply Current vs Temperature
Temperature (
C)
0
20
40
60
80
7
7.4
7.8
8.2
8.6
9
9.4
V
IN
=3V
I
S
(
A)
Oscillator Frequency vs Input Voltage
V
IN
(V)
Fr
e
que
ncy (
K
H
z
)
1
1.5
2
2.5
3
3.5
4
4.5
5
60
70
80
90
100
110
120
130
Ta = 25
C
Oscillator Frequency vs Temperature
Temperature (
C)
Fr
e
que
ncy (
K
H
z
)
0
10
20
30
40
50
60
70
80
117
118
119
120
121
122
123
V
IN
=3V
AIC1633
5
TYPICAL PERFORMANCE CHARACTERISTICS
(CONTINUED)
Maximum Load Current vs
Switch Current Limit Resistance
R
ILIM
(K
)
0
100
200
300
400
500
0
50
100
150
200
250
300
600
AIC1633/AIC1633-3
Ta=25
C
5% V
OUT
Drop
V
IN
=3V
I
L
(m
A)
V
IN
=2.5V
V
IN
=2.2V
V
IN
=2.0V
V
IN
=1.8V
Maximum Load Current vs
Switch Current Limit Resistance
0
20
40
60
80
100
120
0
50
100
150
200
250
300
350
R
ILIM
(K
)
AIC1633-5
Ta=25
C
5% V
OUT
Drop
V
IN
=3V
I
L
(m
A)
V
IN
=3.3V
V
IN
=2.2V
V
IN
=2.0V
V
IN
=1.8V
V
IN
=2.5V
BLOCK DIAGRAM
SGND
SW
LBO
A
100mV
VIN
ILIM/SD
Shutdown
OSC
1.22V
-
+
0.617V
-
+
CGND
LBI
VOUT
-
+
Current Limit
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