MAX1921 datasheet(2/12 Pages) MAXIM

2 / 12 page

IN, FB, SHDN to AGND...........................................-0.3V to +6V

OUT to AGND, LX to PGND.........................-0.3V to (IN + 0.3V)

AGND to PGND....................................................-0.3V to +0.3V

OUT Short Circuit to GND..................................................... 10s

Continuous Power Dissipation (TA = +70°C)

6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .......695mW

6-Pin TDFN (derate 18.2mW/°C above +70°C) .....1454.5mW

Operating Temperature Range........................... -40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature........................................ -65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

(VIN = 3.6V, SHDN = IN, TA = 0°C to +85°C. Typical parameters are at TA = +25°C, unless otherwise noted.) (Note 1)

Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Electrical Characteristics

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

VIN

I(LX) < 400mA

2.5

5.5

I(LX) < 200mA

(MAX1921EUT15, MAX1921EUT18)

2.0

2.5

Startup Voltage

2.0

UVLO Threshold

UVLO

VIN rising

1.85

1.95

VIN falling

1.50

1.65

UVLO Hysteresis

200

Quiescent Supply Current

IIN

No switching, no load

µA

Quiescent Supply Current Dropout

IIN

SHDN = IN, OUT/FB = 0

220

300

µA

Shutdown Supply Current

ISHDN

SHDN = GND

0.1

4.0

µA

Output Voltage Accuracy

(MAX1921)

IOUT = 0, TA = +25°C

-1.5

+1.5

IOUT = 0 to 400mA, TA = -40°C to +85°C

-3

IOUT = 0 to 200mA, TA = -40°C to +85°C

-3

OUT BIAS Current

IOUT

SHDN = 0

µA

OUT at regulation voltage

Output Voltage Range

(MAX1920)

Figure 4, IN = 4.5V

1.25

4.00

FB Feedback Threshold

(MAX1920)

VFB

TA = +25°C

1.231

1.25

1.269

1.220

1.25

1.280

TA = -40°C to +85°C

1.210

1.280

FB Feedback Hysteresis

(MAX1920)

VHYS

FB Bias Current (MAX1920)

IFB

FB = 1.5V

0.01

0.20

µA

Load Regulation

IOUT = 0 to 400mA

0.005

%/mA

Line Regulation

VIN = 2.5V to 5.5V

0.2

%/V

SHDN Input Voltage High

VIH

1.6

SHDN Input Voltage Low

VIL

0.4

SHDN Leakage Current

ISHDN

SHDN = GND or IN

0.001

1.000

µA

High-Side Current Limit

ILIMP

525

730

950

MAX1920/MAX1921

Low-Voltage, 400mA Step-Down

DC-DC Converters in SOT23

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