MAX640 MAXIM [Maxim Integrated Products], MAX640 Datasheet - Page 3

• Manufacturer Part Number: MAX640
• Description: 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
• Manufacturer: MAXIM [Maxim Integrated Products]

ELECTRICAL CHARACTERISTICS (continued)
(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I
unless otherwise noted.)
(Circuit of Figure 3, internal feedback, L = 100µH, T
Note 2: Output guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and
__________________________________________Typical Operating Characteristics
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
100
90
80
70
60
50
10
output voltage trip points).
L = 100 H
V
+
PARAMETER
= 9V
100
OUTPUT CURRENT
OUTPUT CURRENT (A)
EFFICIENCY vs.
1m
_______________________________________________________________________________________
5V/3.3V/3V/Adjustable, High-Efficiency,
10m
MAX639
MAX640
MAX653
Low I
100m
V+ = 9V, T
V+ = 6V, T
V+ = 4V, T
V+ = 11.5V, V
VFB = 2V
MAX6_ _C
MAX6_ _E/M
V
MAX6_ _C
MAX6_ _E/M
V
V
50mV overdrive
SHDN = 0V
LBI
LBO
LBO
1
= 2V
= 0.4V
= 11.5V
Q
A
A
A
, Step-Down DC-DC Converters
= +25°C, MAX639/MAX640/MAX653
= T
= T
100
90
80
70
60
50
LX
A
MIN
MIN
10
= 0V
= +25°C, unless otherwise noted.)
L = 470 H
to T
to T
CONDITIONS
100
MAX
MAX
LOAD
OUTPUT CURRENT
OUTPUT CURRENT (A)
EFFICIENCY vs.
, MAX639
, MAX640/MAX653
T
T
MAX639
MAX640/MAX653
= 0mA, T
A
A
MAX639, V+ = 6V
MAX640, V+ = 4.3V
MAX653, V+ = 4V
1m
= +25°C
= T
MIN
A
10m
to T
= T
MAX
MIN
100m
to T
MAX
, typical values are at T
100
90
80
70
60
50
10
MIN
1.26
1.24
1.26
1.24
0.80
0.10
0.8
0.4
L = 470 H
V+ = 9V
100
OUTPUT CURRENT
OUTPUT CURRENT (A)
0.003
0.001
TYP
1.28
1.28
1.28
1.28
1.15
0.20
EFFICIENCY vs.
0.8
4.0
2.5
1.2
50
25
2
1m
MAX639
MAX640
MAX653
MAX
A
30.0
15.0
1.30
1.32
1.30
1.32
2.00
0.40
1.5
2.5
2.8
1.0
0.1
10
= +25°C,
10m
UNITS
mA
mV
µA
nA
nA
µA
µA
µs
Ω
V
V
V
100m
3