Rainbow-electronics MAX1637 Manual do Utilizador Página 4

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0
10
5
15
20
0 3 41 2 5 6 87 9
SUPPLY CURRENT
vs. LOAD CURRENT
MAX1637-07
LOAD CURRENT (A)
V
CC
+ V
GG
SUPPLY CURRENT (mA)
SYNC = HIGH
SYNC = LOW
SKIP = LOW
MAX1637
Miniature, Low-Voltage,
Precision Step-Down Controller
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
CC
= V
GG
= 5V, SYNC = V
CC
, I
REF
= 0mA, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
SHDN, SKIP, SYNC
SHDN, SKIP, SYNC
% of nominal output
FB, with respect to regulation point
CONDITIONS
V0.8Logic Input Voltage Low
V2.4Logic Input Voltage High
%60 80Output Undervoltage Lockout Threshold
%4.0 10Overvoltage Trip Threshold
UNITSMIN TYP MAXPARAMETER
Note 1: Guaranteed by design, not production tested.
Note 2: Specifications from -40°C to 0°C are guaranteed by design and not production tested.
__________________________________________Typical Operating Characteristics
(V
OUT
= 3.3V, T
A
= +25°C, unless otherwise noted.)
100
50
0.01 1010.1
EFFICIENCY vs. LOAD CURRENT
(1.7V/7A CIRCUIT)
70
60
90
80
MAX1637-01
LOAD CURRENT (A)
EFFICIENCY (%)
SKIP = LOW
V
BATT
= 7V
V
BATT
= 15V
V
BATT
= 22V
100
0
0.001 1010.01 0.1
EFFICIENCY vs. LOAD CURRENT
(2.5V/3A CIRCUIT)
40
30
20
10
80
70
90
60
50
MAX1637-02
LOAD CURRENT (A)
EFFICIENCY (%)
V
BATT
= 15V
SKIP = LOW
V
BATT
= 7V
V
BATT
= 22V
100
50
0.01 1010.1
EFFICIENCY vs. LOAD CURRENT
(2.5V/2A CIRCUIT)
70
60
90
80
MAX1637-03
LOAD CURRENT (A)
EFFICIENCY (%)
V
BATT
= 7V
SKIP = LOW
V
BATT
= 15V
V
BATT
= 22V
100
50
0.01 1010.1
EFFICIENCY vs. LOAD CURRENT
(3.3V/3A CIRCUIT)
70
60
90
80
MAX1637-04
LOAD CURRENT (A)
EFFICIENCY (%)
V
BATT
= 5V
V
BATT
= 30V
V
BATT
= 15V
SKIP = LOW
0
10
5
15
20
3.0 4.03.5 4.5 5.0
5.5
6.0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1637-06
SUPPLY VOLTAGE (V)
V
CC
+ V
GG
SUPPLY CURRENT (mA)
I
LOAD
= 1A
V
OUT
= 3.3V
SKIP = HIGH
SKIP = LOW
OVERVOLTAGE PROTECTION
INPUTS AND OUTPUTS
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