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MAX1921 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part # MAX1921
Description  Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
PDF  12 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1921 Datasheet(HTML) 3 Page - Maxim Integrated Products

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(VIN = 3.6V, SHDN = IN, TA = 0°C to +85°C. Typical parameters are at TA = +25°C, unless otherwise noted.) (Note 1)
Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design.
(CIN = 2.2μF ceramic, Circuit of Figure 1, components of Table 1, unless otherwise noted.)
Electrical Characteristics (continued)
Typical Operating Characteristics
3.201
3.234
3.267
3.300
3.333
3.366
3.399
0
100
50
150 200 250 300 350 400
OUTPUT VOLTAGE ACCURACY vs. LOAD
(VOUT = 3.3V)
LOAD (mA)
VIN = 3.6V
VIN = 5V
VIN = 4.2V
100
0
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
20
LOAD CURRENT (mA)
40
60
80
70
50
30
10
90
VIN = 3.6V
VIN = 4.2V
VIN = 5V
1.455
1.470
1.485
1.500
1.515
1.530
1.545
0
100
50
150 200 250 300 350 400
OUTPUT VOLTAGE ACCURACY vs. LOAD
(VOUT = 1.5V)
LOAD (mA)
VIN = 5V
VIN = 3.3V
VIN = 2.5V
100
0
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.5V)
20
LOAD CURRENT (mA)
40
60
80
70
50
30
10
90
VIN = 2.5V
VIN = 3.3V
VIN = 5V
100
0
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
20
LOAD CURRENT (mA)
40
60
80
70
50
30
10
90
VIN = 2.7V
VIN = 3.3V
VIN = 5V
2.425
2.450
2.475
2.500
2.525
2.550
2.575
0
100
50
150 200 250 300 350 400
OUTPUT VOLTAGE ACCURACY vs. LOAD
(VOUT = 2.5V)
LOAD (mA)
VIN = 3V
VIN = 5V
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
RONSR ILX = 40mA, VIN = 3V
0.5
0.9
Ω
Rectifier Off-Current Threshold
ILXOFF
60
mA
LX Leakage Current
ILXLEAK IN = SHDN = 5.5V, LX = 0 to IN
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
MAX1920/MAX1921
Low-Voltage, 400mA Step-Down
DC-DC Converters in SOT23
www.maximintegrated.com
Maxim Integrated │ 3



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