MAX1921EUT25 datasheet(3/11 Pages) MAXIM

Part #	MAX1921EUT25

Description	Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Voltage, 400mA Step-Down

DC-DC Converters in SOT23

_______________________________________________________________________________________

3

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

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

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

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

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

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

Typical Operating Characteristics

(CIN = 2.2µF ceramic, Circuit of Figure 1, components of Table 1, unless otherwise noted.)

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

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

Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed

by design.

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