Owner manual

MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
4 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), T
A
= +25°C, unless otherwise noted.)
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.4V, L1 = 22µH)
20
MAX1678-01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.0V
V
IN
= 1.5V
L1 = 22µH
SUMIDA CD43-220
R1 = 200kΩ, R2 = 200kΩ
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.4V, L1 = SUMIDA 47µH)
20
MAX1678-02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.0V
V
IN
= 1.5V
L1 = 47µH
SUMIDA CD43-470
R1 = 200kΩ, R2 = 200kΩ
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.4V, L1 = TDK 47µH)
20
MAX1678-03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.0V
V
IN
= 1.5V
L1 = 47µH
TDK NLC453232T-470K
R1 = 200kΩ, R2 = 200kΩ
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V, L1 = 22µH)
20
MAX1678-04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.5V
V
IN
= 2.0V
L1 = 22µH
SUMIDA CD43-220
FB = GND
V
IN
= 1.5V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V, L1 = 22µH)
20
MAX1678-07
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 4.5V
V
IN
= 2.0V
L1 = 22µH
SUMIDA CD43-220
R1 = 619kΩ, R2 = 200kΩ
V
IN
= 3.0V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V, L1 = SUMIDA 47µH)
20
MAX1678-05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.5V
V
IN
= 2.0V
L1 = 47µH
SUMIDA CD43-470
FB = GND
V
IN
= 1.5V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V, L1 = TDK 47µH)
20
MAX1678-06
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 2.5V
V
IN
= 2.0V
L1 = 47µH
TDK NLC453232T-470K
FB = GND
V
IN
= 1.5V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V, L1 = SUMIDA 47µH)
20
MAX1678-08
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 4.5V
V
IN
= 3.0V
L1 = 47µH
SUMIDA CD43-470
R1 = 619kΩ, R2 = 200kΩ
V
IN
= 2.0V
V
IN
= 1.2V
V
IN
= 0.85V
100
0
0.01 0.1 1 10 100
200
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5.0V, L1 = TDK 47µH)
20
MAX1678-09
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
70
50
30
10
V
IN
= 4.5V
V
IN
= 3.0V
L1 = 47µH
TDK NLC453232-470K
R1 = 619kΩ, R2 = 200kΩ
V
IN
= 2.0V
V
IN
= 1.2V
V
IN
= 0.85V