MAX640C/D Ver la hoja de datos (PDF) - Maxim Integrated
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MAX640C/D Datasheet PDF : 13 Pages
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5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD = 0mA, TA = TMIN to TMAX, typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
LX Switch On-Resistance
LX Switch Leakage
VFB Bias Current
VFB Dual-Mode Trip Point
VFB Threshold
LBI Bias Current
LBI Threshold
LBO Sink Current
LBO Leakage Current
LBO Delay
SHDN Threshold
SHDN Pull-Up Current
CONDITIONS
V+ = 9V, TA = +25°C, MAX639/MAX640/MAX653
V+ = 6V, TA = TMIN to TMAX, MAX639
V+ = 4V, TA = TMIN to TMAX, MAX640/MAX653
V+ = 11.5V, VLX = 0V
TA = +25°C
TA = TMIN to TMAX
VFB = 2V
MAX6_ _C
MAX6_ _E/M
VLBI = 2V
MAX6_ _C
MAX6_ _E/M
VLBO = 0.4V
VLBO = 11.5V
50mV overdrive
MAX639
MAX640/MAX653
SHDN = 0V
MIN TYP MAX UNITS
0.8
1.5
2.5
Ω
2.8
0.003 1.0
µA
30.0
4.0
15.0
nA
50
mV
1.26 1.28 1.30
V
1.24 1.28 1.32
2
10
nA
1.26 1.28 1.30
V
1.24 1.28 1.32
0.8
2.5
mA
0.4
1.2
0.001 0.1
µA
25
µs
0.80 1.15 2.00
V
0.10 0.20 0.40
µA
Note 2: Output guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and
output voltage trip points).
__________________________________________Typical Operating Characteristics
(Circuit of Figure 3, internal feedback, L = 100µH, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs.
OUTPUT CURRENT
100
L = 100µH
V+ = 9V
90
80
MAX639
MAX640
70
MAX653
60
50
10µ 100µ 1m 10m 100m 1
OUTPUT CURRENT (A)
EFFICIENCY vs.
OUTPUT CURRENT
100
L = 470µH
90
80
MAX639, V+ = 6V
MAX640, V+ = 4.3V
MAX653, V+ = 4V
70
60
50
10µ
100µ
1m
10m
OUTPUT CURRENT (A)
100m
EFFICIENCY vs.
OUTPUT CURRENT
100
L = 470µH
V+ = 9V
90
80
MAX639
70
MAX640
MAX653
60
50
10µ
100µ
1m
10m
OUTPUT CURRENT (A)
100m
_______________________________________________________________________________________ 3
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