Typical operating characteristics (continued) – Rainbow Electronics MAX1643 User Manual
Page 4
MAX1642/MAX1643
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
4
_______________________________________________________________________________________
0.6
0
MINIMUM START-UP INPUT VOLTAGE
vs. OUTPUT CURRENT
0.7
0.8
MAX1642/43 TOC07b
OUTPUT CURRENT (mA)
START-UP INPUT VOLTAGE (V)
12
14
1.2
1.1
1.5
1.4
1.3
0.9
1.0
2
4
6
10
16
1.6
8
L1 = 150
µ
H
TDK NLC565050T-151K
V
OUT
= 5V
V
OUT
= 2.4V, 3.3V
0.6
0
MINIMUM START-UP INPUT VOLTAGE
vs. OUTPUT CURRENT
0.7
0.8
MAX1642/43 TOC07a
OUTPUT CURRENT (mA)
START-UP INPUT VOLTAGE (V)
20
1.2
1.1
1.5
1.4
1.3
0.9
1.0
5
15
25
1.6
10
L1 = 100
µ
H
SUMIDA CD54-101
V
OUT
= 5V
V
OUT
= 2.4V, 3.3V
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 4, V
BATT
= 1.2V, R1 + R2 = 1M
Ω
, T
A
= +25°C, unless otherwise noted.)
0
0.01
1
10
0.1
100
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 3.3V)
10
MAX1642/43 TOC02B
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 1.6V
L1 = 150
µ
H
TDK NLC565050T-151K
V
IN
= 1.2V
V
IN
= 0.85V
V
IN
= 1.0V
20
30
40
50
60
70
80
90
100
100
90
80
0
0.01
1
10
0.1
100
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 5.0V)
20
10
MAX1642/43 TOC03a
OUTPUT CURRENT (mA)
EFFICIENCY (%)
30
40
50
60
70
V
IN
= 1.6V
V
IN
= 0.85V
V
IN
= 1.0V
L1 = 100
µ
H
SUMIDA CD54-101
V
IN
= 1.2V
100
90
80
0
0.01
1
10
0.1
100
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 5.0V)
20
10
MAX1642/43 TOC03b
OUTPUT CURRENT (mA)
EFFICIENCY (%)
30
40
50
60
70
V
IN
= 1.6V
V
IN
= 0.85V
V
IN
= 1.0V
L1 = 150
µ
H
TDK NLC565050T-151K
V
IN
= 1.2V
10,000
10
0.8
1.0
1.4
1.8
NO-LOAD BATTERY CURRENT
vs. INPUT VOLTAGE
100
1000
MAX1642/43 TOC04
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
m
A)
1.2
1.6
V
OUT
= 5.0V
V
OUT
= 2.5V OR 3.3V
0
-40
NO-LOAD BATTERY CURRENT
vs. TEMPERATURE
20
MAX1642/43 TOC05
TEMPERATURE (°C)
QUIESCENT CURRENT (
µ
A)
60
100
120
80
40
60
-20
40
20
80
100
140
0
V
BATT
= 1.2V
V
OUT
= 3.3V
0
-40
BATT AND OUT PIN QUIESCENT CURRENTS
vs. TEMPERATURE
5
MAX1642/43 TOC06
TEMPERATURE (°C)
QUIESCENT CURRENT (
µ
A)
60
20
25
10
15
-20
40
20
80
100
30
0
V
BATT
= 1.2V
V
OUT
= 3.6V
I
BATT
I
OUT