AIC1631
2-Cell, 500mA, 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-1631-04 Dec 27, 00
TEL: 886-3-5772500
FAX: 886-3-5772510
1
FEATURES
High Efficiency 90%.
Adjustable Output Voltage with Two Resistors
(AIC1631A)
Power-Saving Shutdown Mode (7
A typical).
Internal 2A Switch.
120KHz Switching Rate.
Adjustable Switch Current Limit.
On-Chip Low Battery Detector.
APPLICATIONS
Palmtop & Notebook Computers.
Pocket Organizers.
Cameras.
Pagers.
Battery Backup Supplies.
Portable Instruments.
DESCRIPTION
The AIC1631 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 exter-
nally set to an arbitrary value below breakdown
voltage of the power switch for AIC1631A. Effi-
ciency beyond 87% can be easily achieved at
100mA load with 2.2V to 3V input voltages.
Logic-controlled shutdown mode is provided for
power saving. Switch current limit can be pro-
grammed with a resistor. The low battery de-
tector 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 25
H to 50H inductance are re-
commended for most applications.
TYPICAL APPLICATION CIRCUIT
AIC1631
LOAD
100
F
NORMAL
R
ILIM
SD
ILIM/SD
VOUT
VIN
LBI
SW
LBO
SGND
CGND
+V
IN
1N5819
D1
+
+
C1
R1
L
C2
100
F
50
H
100
+V
OUT
(3.3V)
Note: V
IN
1.8V, V
OUT
7V
High Efficiency Step-Up DC/DC Converter
AIC1631
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
AIC1631CN
AIC1631-3CN
AIC1631-5CN
(PLASTIC DIP
)
PIN CONFIGURATION
AIC1631CS
AIC1631-3CS
AIC1631-5CS
(PLASTIC SO)
TOP VIEW
LBO
1
3
4
2
8
6
5
7
VOUT
VIN
SW
SGND
LBI
CGND
ILIM/SD
AIC1631ACN
(PLASTIC DIP
)
AIC1631ACS
(PLASTIC SO)
TOP VIEW
LBO
1
3
4
2
8
6
5
7
VOUT
VIN
EXT
GND
LBI
FB
ILIM/SD
AIC1631 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
Fig. 4 in Appl. Examples
1.5
7
V
Output Voltage
I
LOAD
=200mA
AIC1631
AIC1631-3
AIC1631-5
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
AIC1631/AIC1631-3
AIC1631-5
160
180
A
Shutdown Mode Current
7
15
A
Shutdown Recovery Time
V
IN
=2.5V, I
LOAD
=200mA
0.4
mS
AIC1631
3
ELECTRICAL CHARACTERISTICS
(CONTINUED)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Efficiency
I
LOAD
=200mA
AIC1631/AIC1631-3
AIC1631-5
87
90
%
Line Regulation
I
LOAD
=100mA
AIC1631, V
IN
=1.8 ~ 3.3V
AIC1631-3, V
IN
=1.8 ~ 3V
AIC1631-5, V
IN
=2.2 ~ 3.3V
0.6
0.5
0.8
%V
OUT
Load Regulation
I
LOAD
=10~300mA
AIC1631/AIC1631-3
AIC1631-5
0.3
0.8
%V
OUT
Oscillator Frequency
90
120
150
KHz
LBI Pin Trip Point
1.17
1.22
1.27
V
FB Threshold Voltage
AIC1631A
0.598
0.617
0.636
V
SW "ON Resistance"
AIC1631/AIC1631-3
AIC1631-5
0.5
0.4
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
I
SW
(A)
1
0
0.5
1
1.5
2
2.5
3
0
0.25
0.5
0.75
Ta=25
C
AIC1631/1631-3
AIC1631-5
V
SW
(V
)
Switch Voltage vs. Current
0
20
40
60
80
0.36
0.38
0.42
0.46
0.5
.0.54
0.58
Temperature (
C)
AIC1631/1631-3
AIC1631-5
SW
R
DS
(
)
SW ON Resistance vs. Temperature
AIC1631
4
TYPICAL PERFORMANCE CHARACTERISTICS
(CONTINUED)
1.5
1
2.0
2.5
3.0
3.5
4.0
4.5
5.0
140
150
160
170
180
190
200
V
IN
(V)
Ta=25
C
AIC1631/1631-3
AIC1631-5
I
S
(
A)
No Load Supply Current vs. Input Voltage
0
20
40
60
80
210
200
190
180
170
160
150
Temperature (
C)
AIC1631/1631-3
AIC1631-5
I
S
(
A)
No Load Supply Current vs. Temperature
7.0
7.2
7.4
7.6
7.8
8.0
8.2
1
1.5
2
2.5
3
3.5
4
4.5
5
V
IN
(V)
Ta=25
C
I
S
(
A)
Shutdown Mode Supply Current vs. Input Voltage
9.4
0
20
40
60
80
7.0
7.4
7.8
8.2
6.6
9.0
Temperature (
C)
V
IN
=3V
I
S
(
A)
Shutdown Mode Supply Current vs. Temperature
1
2
3
4
5
130
60
70
90
110
V
IN
(V)
Ta=25
C
F
r
e
q
u
e
ncy (
K
Hz
)
Oscillator Frequency vs. Input Voltage
0
20
40
60
80
117
119
121
123
Temperature (
C)
V
IN
=3V
O
s
ci
l
l
at
or
Fr
eq
u
e
n
c
y
(
K
H
z
)
Oscillator Frequency vs. Temperature
AIC1631
5
TYPICAL PERFORMANCE CHARACTERISTICS
(CONTINUED)
R
ILIM
(K
)
Maximum Load Current vs. Switch Current Limit
Resistance
M
a
x
i
m
u
m
Lo
ad
C
u
rr
e
n
t
(
m
A
)
0
200
400
600
800
1000
0
100
200
300
400
500
600
AIC1631/1631-3
Ta=25C
(5% V
OUT
Drop)
V
IN
=2.2V
V
IN
=2.0V
V
IN
=1.8V
V
IN
=2.5V
0
50
100
150
200
V
IN
=2.5V
R
ILIM
(K
)
Maximum Load Current vs. Switch Current Limit
Resistance
M
a
x
i
m
u
m Lo
ad C
u
r
r
e
n
t
(
m
A
)
0
100
200
300
400
500
600
AIC1631/1631-3
Ta=25
C
(5% V
OUT
Drop)
V
IN
=1.8V
V
IN
=2.2V
V
IN
=2.7V
V
IN
=2.0V
BLOCK DIAGRAM
SGND
SW
LBO
A
100mV
VIN
ILIM/SD
Shutdown
OSC
1.22V
-
+
0.617V
-
+
CGND
LBI
VOUT
-
+
Current Limit
PDF 
ZIP