MAX1921EUT18T Просмотр технического описания (PDF) - Maxim Integrated
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MAX1921EUT18T Datasheet PDF : 12 Pages
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MAX1920/MAX1921
Low-Voltage, 400mA Step-Down
DC-DC Converters in SOT23
Electrical Characteristics (continued)
(VIN = 3.6V, SHDN = IN, TA = 0°C to +85°C. Typical parameters are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Low-Side Current Limit
ILIMN
350
550
800
mA
High-Side On-Resistance
RONHS ILX = -40mA, VIN = 3V
0.6
1.1
Ω
Rectifier On-Resistance
Rectifier Off-Current Threshold
LX Leakage Current
RONSR
ILXOFF
ILXLEAK
ILX = 40mA, VIN = 3V
IN = SHDN = 5.5V, LX = 0 to IN
0.5
0.9
Ω
60
mA
0.1
5.0
µA
LX Reverse Leakage Current
ILXLKR IN unconnected, VLX = 5.5V, SHDN = GND
0.1
5.0
µA
Minimum On-Time
tON(MIN)
0.28
0.4
0.5
µs
Minimum Off-Time
tOFF(MIN)
0.28
0.4
0.5
µs
Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design.
Typical Operating Characteristics
(CIN = 2.2μF ceramic, Circuit of Figure 1, components of Table 1, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
100
VIN = 3.6V
90
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
100
VIN = 2.7V
90
80
VIN = 5V
80
70
VIN = 4.2V
70
VIN = 3.3V VIN = 5V
60
60
50
50
40
40
30
30
20
20
10
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE ACCURACY vs. LOAD
(VOUT = 3.3V)
3.399
OUTPUT VOLTAGE ACCURACY vs. LOAD
(VOUT = 2.5V)
2.575
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.5V)
100
90 VIN = 2.5V
80
70
VIN = 3.3V
60
50
VIN = 5V
40
30
20
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE ACCURACY vs. LOAD
(VOUT = 1.5V)
1.545
3.366
3.333
3.300
3.267
VIN = 4.2V
3.234
VIN = 5V
VIN = 3.6V
2.550
2.525
VIN = 5V
2.500
2.475
VIN = 3V
2.450
1.530
1.515
1.500
1.485
1.470
VIN = 5V
VIN = 3.3V
VIN = 2.5V
3.201
0
50 100 150 200 250 300 350 400
LOAD (mA)
2.425
0
50 100 150 200 250 300 350 400
LOAD (mA)
1.455
0
50 100 150 200 250 300 350 400
LOAD (mA)
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