MAX639 Maxim, MAX639 Datasheet - Page 5

• Manufacturer Part Number: MAX639
• Description: 5V/3.3V/3V/Adjustable / High-Efficiency / Low IQ / Step-Down DC-DC Converters
• Manufacturer: Maxim

(Circuit of Figure 3, internal feedback, L = 100µH, T
_____________________________Typical Operating Characteristics (continued)
12
10
8
6
4
2
0
0
MEASURED FROM THE RISING EDGE
OF V+ OR SHDN TO (V
10
V+ = 9.0V
20
START-UP TIME vs.
OUTPUT CURRENT (mA)
OUTPUT CURRENT
30
V+ = 11.5V
40
MAX639
V+ = 5.5V
_______________________________________________________________________________________
40
30
20
10
0
OUT
50
0
5V/3.3V/3V/Adjustable, High-Efficiency,
MEASURED FROM THE RISING EDGE OF
V+ OR SHDN TO (V
OR (V
START-UP TIME DIFFERENCE BETWEEN
THE MAX640 AND THE MAX653 IS
NEGLIGIBLE.
L = 470 H
= 5V).
60
V+ = 5.0V
OUT
5
Low I
70
= 3.0V)(MAX653). THE
START-UP TIME vs.
OUTPUT CURRENT (mA)
OUTPUT CURRENT
MAX640/MAX653
80
10
90
OUT
V+ = 11.5V
100
15
= 3.3V)(MAX640)
Q
20
, Step-Down DC-DC Converters
V+ = 9.0V
10
8
6
4
2
0
25
A
0
MEASURED FROM THE RISING EDGE OF V+
OR SHDN TO (V
(V
TIME DIFFERENCE BETWEEN THE
MAX640 AND THE MAX653
IS NEGLIGIBLE.
= +25°C, unless otherwise noted.)
L = 100 H
OUT
10
V+ = 5.0V
30
= 3.0V)(MAX653). THE START-UP
20
START-UP TIME vs.
OUTPUT CURRENT (mA)
OUTPUT CURRENT
MAX640/MAX653
30
OUT
40
V+ = 11.5V
= 3.3V)(MAX640) OR
50
60
70
V+ = 9.0V
80
70
60
50
40
30
20
10
0
90
0 1
100
NO-LOAD SUPPLY CURRENT vs.
2
3
INPUT VOLTAGE
INPUT VOLTAGE (V)
4
40
30
20
10
0
5
0
MEASURED FROM THE RISING EDGE
OF V+ OR SHDN TO (V
L = 470 H.
MAX653, V
6
MAX639, V
7
5
8
OUT
START-UP TIME vs.
OUTPUT CURRENT (mA)
OUTPUT CURRENT
OUT
9
10
= 3V
10
= 5V
MAX639
V+ = 9.0V
11 12
OUT
15
V+ = 5.5V
= 5.0V)
20
V+ = 11.5V
25
30
5