MAX1705 Maxim, MAX1705 Datasheet - Page 6

• Manufacturer Part Number: MAX1705
• Description: 1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear Regulator
• Manufacturer: Maxim

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