MAX640C Ver la hoja de datos (PDF) - Maxim Integrated
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componentes Descripción
Fabricante
MAX640C Datasheet PDF : 13 Pages
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5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 3, internal feedback, L = 100µH, TA = +25°C, unless otherwise noted.)
MAX639
START-UP TIME vs.
OUTPUT CURRENT
12
MEASURED FROM THE RISING EDGE
10 OF V+ OR SHDN TO (VOUT = 5V).
V+ = 5.5V
8
V+ = 9.0V
6
4
2
V+ = 11.5V
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
MAX640/MAX653
START-UP TIME vs.
OUTPUT CURRENT
10
MEASURED FROM THE RISING EDGE OF V+
OR SHDN TO (VOUT = 3.3V)(MAX640) OR
8 (VOUT = 3.0V)(MAX653). THE START-UP
TIME DIFFERENCE BETWEEN THE
MAX640 AND THE MAX653
6 IS NEGLIGIBLE.
V+ = 5.0V
4
V+ = 9.0V
2
V+ = 11.5V
L = 100µH
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
MAX639
START-UP TIME vs.
OUTPUT CURRENT
40
MEASURED FROM THE RISING EDGE
OF V+ OR SHDN TO (VOUT = 5.0V)
L = 470µH.
30
V+ = 5.5V
20
V+ = 9.0V
10
V+ = 11.5V
0
0 5 10 15 20 25 30
OUTPUT CURRENT (mA)
MAX640/MAX653
START-UP TIME vs.
OUTPUT CURRENT
40
MEASURED FROM THE RISING EDGE OF
V+ OR SHDN TO (VOUT = 3.3V)(MAX640)
OR (VOUT = 3.0V)(MAX653). THE
30 START-UP TIME DIFFERENCE BETWEEN
THE MAX640 AND THE MAX653 IS
NEGLIGIBLE.
L = 470µH
20
V+ = 5.0V
10
V+ = 9.0V
V+ = 11.5V
0
0 5 10 15 20 25 30
OUTPUT CURRENT (mA)
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE
70
60
MAX639, VOUT = 5V
50
40
MAX653, VOUT = 3V
30
20
10
0
0 1 2 3 4 5 6 7 8 9 10 11 12
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 5
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