MAX1678 Maxim, MAX1678 Datasheet - Page 4

• Manufacturer Part Number: MAX1678
• Description: 1-Cell to 2-Cell / Low-Noise / High-Efficiency / Step-Up DC-DC Converter
• Manufacturer: Maxim

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