AIC1640
Low Voltage Step-Up DC/DC Converter
DS-1640-02 012102
1
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FEATURES
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A Guaranteed Start-Up from less than 0.9 V.
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High Efficiency.
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Low Quiescent Current.
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Fixed or adjustable Output Voltage.
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Logic Controlled Shutdown.
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APPLICATIONS
l
Pagers.
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Cameras.
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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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DESCRIPTION
The AIC1640 is a high efficiency step-up DC/DC
converter for applications using 1 to 4 battery
cells. Only three external components are re-
quired to deliver a fixed output voltage of 2.7V,
3V, 3.3V, or 5V.
Pulse Frequency Modulation scheme brings op-
timized performance for applications with light
output loading and low input voltage. The output
ripple and noise are lower compared with the cir-
cuit operating in PSM mode. The AIC1640 starts
up from less than 0.9V input to boost either 2.7V,
3V, 3.3V, or 5V output with 1mA load.
Some useful features include, shutdown mode for
saving the life of battery, and adjustable output
version. The PFM control circuit operates in
100KHz (max.) switching rate, resulting in smal-
ler passive component size, which makes the
AIC1640 an ideal choice of DC/DC converter for
space conscious applications.
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TYPICAL APPLICATION CIRCUIT
C1
22
F
L1
100
H
D1
AIC1640
GND
CE
SW
VOUT
V
OUT
V
IN
+
0.9V
GS SS14
+
C2
47
F
+
C1
22
F
L1
100
H
D1
AIC1640A
FB
CE
SW
VOUT
V
OUT
V
IN
0.9V
+
C2
47
F
GS SS14
R1
R2
C3
One Cell Step-Up DC/DC Converter with
Fixed Output Voltage
One Cell Step-Up DC/DC Converter with
Adjustable Output Voltage
AIC1640
2
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ORDERING INFORMATION
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGE TYPE
O: MSOP8
S: SMALL OUTLINE
OUTPUT VOLTAGE
27: 2.7V
30: 3.0V
33: 3.3V
50: 5.0V
A: Adjustable
AIC1640-XXCXXX
Example: AIC1640-27COTR
2.7V Version, in MSOP8 Package
& Tape & Reel Packing Type
NC
CE
NC
GND
SW
NC
NC (FB)
VOUT
1
3
4
2
8
6
5
7
FB: For AIC1640A
NC
CE
NC
GND
SW
NC
NC (FB)
VOUT
1
3
4
2
8
6
5
7
FB: For AIC1640A
PIN CONFIGURATION
MSOP8
TOP VIEW
SO-8
TOP VIEW
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ABSOLUATE MAXIMUM RATINGS
Supply Voltage ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .12V
SW Pin Voltage ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .12V
FB 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
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TEST CIRCUIT
F
OUT
AIC1640
2.5V
VOUT
SW
GND
100
CE
Oscillator Test Circuit
AIC1640
3
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ELECTRICAL CHARACTERISTICS
(T
A
=25
C, I
O
=10mA, Unless otherwise
specified)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
Output Voltage
AIC1640-27 V
IN
=1.8V
AIC1640-30 V
IN
=1.8V
AIC1640-33 V
IN
=2.0V
AIC1640-50 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
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
AIC1640-27
AIC1640-30
AIC1640-33
AIC1640-50
V
IN
=V
OUT
x 0.95
Measurement of the IC input current
(VOUT pin)
I
DD1
42
50
60
90
A
Supply Current
V
IN
=V
OUT
+ 0.5V
Measurement of the IC input current
(VOUT pin)
I
DD2
7
A
FB Reference Voltage
V
REF
1.21
1.24
1.27
V
SW Leakage Current
V
SW
=10V, V
IN
=V
OUT
+ 0.5V
0.5
A
SW Switch-On Resistance
AIC1640-27
AIC1640-30
AIC1640-33
AIC1640-50
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 SW Pin wave-
form
DUTY
65
75
85
%
AIC1640
4
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ELECTRICAL CHARACTERISTICS
(Continued)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
Max. Oscillator Freq.
V
IN
=V
OUT
x 0.95
Measurement of the SW pin wave-
form
F
OSC
80
105
130
KHz
CE "High" Voltage Level 1 V
OUT
1.5V
V
CEH1
V
OUT
- 0.4
V
CE "Low" Voltage Level 1
V
OUT
1.5V
V
CEL1
0.4
V
CE "High" Voltage Level 2 0.8V
V
OUT
1.5V
V
CEH2
V
OUT
- 0.3
V
CE "Low" Voltage Level 2
0.8V
V
OUT
1.5V
V
CEL2
0.15
V
CE "High" Input Current
Same as I
DD1
, V
CE
=V
OUT
x 0.95
I
CEH
0.5
A
CE "Low" Input Current
Same as I
DD1
, V
CE
= 0V
I
CEL
-0.5
A
Efficiency
85
%
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TYPICAL PERFORMANCE CHARACTERISTICS
Capacitor (C1) : 47
F (Tantalum Type)
Diode (D1) : 1N5819 Schottky Type
Fig. 1 AIC1640-27 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
=1.2
V
IN
=0.9V
Output voltage (V)
Output Current (mA)
Fig. 2 AIC1640-27 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
Efficiency (%)
Output current (mA)
AIC1640
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TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
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
V
IN
=2.0V
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
Fig. 3 AIC1640-30 Load Regulation (L=100
H CD54)
Output voltage V
OUT
(V)
Output Current (mA)
0
20
40
60
80
100
120
140
160
180
50
55
60
65
70
75
80
85
V
IN
=2.0
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
Fig. 4 AIC1640-30 Efficiency (L=100
H CD54)
Efficiency (%)
Output Current (mA)
Output Voltage (V)
0
25
50
75
100
125
150
175
200
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
Fig. 5 AIC1640-33 Load Regulation (L=100
H CD54)
Output Current (mA)
V
IN
=2.0V
Efficiency (%)
0
2
5
50
75
100
125
150
175
200
50
55
60
65
70
75
80
85
90
V
IN
=2.0V
V
IN
=1.8V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.9V
Fig. 6 AIC1640-33 Efficiency (L=100
H CD54)
Output Current (mA)
0
50
100
150
200
250
300
350
400
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
IN
=1.2V
V
IN
=3.0V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=0.9V
Fig. 7 AIC1640-50 Load Regulation ( L=100
H CD54)
Output Voltage (V)
Output Current (mA)
Fig. 8 AIC1640-50 Efficiency (L=100
H CD54)
0
50
100
150
200
250
300
350
400
20
30
40
50
60
70
80
90
100
Efficiency (%)
Output Current (mA)
V
IN
=3.0V
V
IN
=2.0V
V
IN
=1.2V
V
IN
=1.5V
V
IN
=0.9V
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