MAX1534 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1534
Maxim Integrated
MAX1534 Datasheet PDF : 16 Pages
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High-Efficiency, Triple-Output, Keep-Alive
Power Supply for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, ILIM = GND, PRESET = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
INPUTS AND OUTPUTS
SHDN Input Trip Level
Rising trip level, 100mV hysteresis
0.96
1.04
PRESET, ILIM Logic Levels
Low
High
0.5
2.2
UNITS
V
V
V
Note 1: The output voltage at light loads has a DC regulation level higher than the error comparator threshold by half the ripple volt-
age.
Note 2: The dropout voltage is defined as VLDOIN - VOUT_ when VLDOIN = VOUT_(NOM). Specification only applies when VOUT_ ≥
2.5V.
Note 3: OUT1, OUT2 DC set point, FB3 set point at the DC trip threshold of buck regulator.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, VIN = +12V, PRESET = GND, TA = +25°C, unless otherwise noted.)
BUCK OUTPUT VOLTAGE
vs. LOAD CURRENT, CIRCUIT 1
5.20
5.15
5.10
VIN = 12V
5.05
5.00
4.95
VIN = 20V
4.90
4.85
ILIM = IN
VIN = 6V
(tON LIMITED)
4.80
0 50 100 150 200 250 300 350 400 450 500
IOUT3 (mA)
BUCK EFFICIENCY
vs. LOAD CURRENT, CIRCUIT 1
100
VIN = 6V
95
90
85
80
VIN = 12V
75
70
VIN = 20V
65
60
55
50
0.1
ILIM = IN
1
10
100
1000
IOUT3 (mA)
100
95
90
85
80
75
70
65
60
55
50
0.1
BUCK EFFICIENCY
vs. LOAD CURRENT, CIRCUIT 2
VIN = 7V
VIN = 12V
VIN = 20V
ILIM = GND
1
10
100
1000
IOUT3 (mA)
BUCK EFFICIENCY vs. LOAD CURRENT
CIRCUIT 1, VIN = 12V
89
L = 22µH
87
85
83
L = 15µH
81
L = 10µH
79
77
75
0.1
ILIM = IN
1
10
100
1000
IOUT3 (mA)
200
180
160
140
120
100
80
60
40
20
0
6
SWITCHING FREQUENCY
vs. VIN, CIRCUIT 1, ILIM = IN
IOUT3 = 500mA
IOUT3 = 250mA
IOUT3 = 100mA
IOUT3 = 50mA
IOUT3 = 10mA
10
14
18
22
26
VIN (V)
_______________________________________________________________________________________ 5
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