MAX1921 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

MAX1921

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

Maxim Integrated 

MAX1920/MAX1921

Low-Voltage, 400mA Step-Down

DC-DC Converters in SOT23

Absolute Maximum Ratings

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

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

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

PARAMETER

Input Voltage Range

Startup Voltage

UVLO Threshold

UVLO Hysteresis

Quiescent Supply Current

Quiescent Supply Current Dropout

Shutdown Supply Current

Output Voltage Accuracy

(MAX1921)

OUT BIAS Current

Output Voltage Range

(MAX1920)

FB Feedback Threshold

(MAX1920)

FB Feedback Hysteresis

(MAX1920)

FB Bias Current (MAX1920)

Load Regulation

Line Regulation

SHDN Input Voltage High

SHDN Input Voltage Low

SHDN Leakage Current

High-Side Current Limit

SYMBOL

CONDITIONS

I(LX) < 400mA

VIN I(LX) < 200mA

(MAX1921EUT15, MAX1921EUT18)

UVLO

VIN rising

VIN falling

IIN

IIN

ISHDN

IOUT

No switching, no load

SHDN = IN, OUT/FB = 0

SHDN = GND

IOUT = 0, TA = +25°C

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

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

SHDN = 0

OUT at regulation voltage

Figure 4, IN = 4.5V

VFB

VHYS

IFB

VIH

VIL

ISHDN

ILIMP

TA = +25°C

TA = -40°C to +85°C

FB = 1.5V

IOUT = 0 to 400mA

VIN = 2.5V to 5.5V

SHDN = GND or IN

MIN TYP MAX UNITS

2.5

5.5

V

2.0

2.5

2.0

V

1.85 1.95

V

1.50 1.65

200

mV

50

70

µA

220

300

µA

0.1

4.0

µA

-1.5

+1.5

-3

+3

%

-3

+3

1

µA

8

16

1.25

4.00

V

1.231 1.25 1.269

1.220 1.25 1.280

V

1.210

1.280

5

mV

0.01 0.20

µA

0.005

%/mA

0.2

%/V

1.6

V

0.4

V

0.001 1.000

µA

525

730

950

mA

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