Typical operating characteristics – Rainbow Electronics MAX1706 User Manual
Page 6
MAX1705/MAX1706
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
6
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
100
0
0.1
10
100
1
1000
MAX1705
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 5V)
20
MAX1705/6 TOC02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
10
30
50
70
L = 10
µ
H
V
OUT
= 5V
A: V
IN
= 0.9V
C: V
IN
= 2.4V
E: V
IN
= 3.6V
1: PFM MODE
2: PWM MODE
A.1
A.2
C.1
C.2
B.2
B.1
100
0
0.1
10
100
1
1000
MAX1705
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 3.3V)
20
MAX1705/6 TOC01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
10
30
50
70
L = 10
µ
H
V
OUT
= 3.3V
A: V
IN
= 0.9V
B: V
IN
= 2.7V
1: PFM MODE
2: PWM MODE
B.1
B.2
A.1
A.2
0
0
MAX1705
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
200
100
300
MAX1705/6 TOC03
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
3.5
700
600
900
800
400
500
1.0
2.5
4.5
1000
2.0
3.0
0.5
4.0
1.5
L = 10
µ
H
PWM MODE
PFM MODE
V
OUT
= 3.3V
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 5V
100
0
0.1
10
100
1
1000
MAX1706
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 3.3V)
20
MAX1705/6 TOC04
OUTPUT CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
10
30
50
70
B.2
A.2
A.1
B.1
L = 22
µ
H
V
OUT
= 3.3V
A: V
IN
= 0.9V
B: V
IN
= 2.7V
1: PFM MODE
2: PWM MODE
0.5
0.01
MAX1705
START-UP INPUT VOLTAGE
vs. OUTPUT CURRENT
0.9
0.7
1.1
MAX1705/6 TOC07
OUTPUT CURRENT (mA)
START-UP INPUT VOLTAGE (V)
100
1.7
1.5
2.1
1.9
1.3
0.1
10
1000
2.3
1
NO-LOAD START-UP:
1.0V AT -40°C
0.79 AT +25°C
0.64V AT +85°C
CONSTANT-CURRENT LOAD
V
OUT
= 3.3V
L = 10
µ
H
D1 = MBR0520L
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
100
0
0.1
10
100
1
1000
MAX1706
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 5V)
20
MAX1705/6 TOC05
OUTPUT CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
10
30
50
70
A.1
A.2
C.2
B.2
C.1
B.1
L = 22
µ
H
V
OUT
= 5V
A: V
IN
= 0.9V
B: V
IN
= 2.4V
C: V
IN
= 3.6V
1: PFM MODE
2: PWM MODE
0
0
MAX1706
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
200
100
300
MAX1705/6 TOC06
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
3.5
700
600
400
500
1.0
3
4.5
2.0
0.5
2.5
4
1.5
PWM MODE
L = 22
µ
H
PFM MODE
V
OUT
= 5V
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 3.3V
0
0
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
2
1
3
MAX1705/6 TOC8
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT (mA)
4.0
7
6
10
9
8
4
5
1.0
3.0
5.0
12
11
2.0
3.5
0.5
2.5
4.5
1.5
PFM MODE
PWM MODE
V
OUT
= 3.3V
L = 10
µ
H
0
0
LINEAR-REGULATOR DROPOUT
VOLTAGE vs. LOAD CURRENT
20
40
MAX1705/6 TOC09
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
160
120
100
60
80
40
120
200
140
80
V
LDO
= 3.3V
V
LDO
= 2.5V
V
LDO
= 5V