Rainbow-electronics MAX1947 Manual do Utilizador descarregar pdf (Página 2)

MAX1947

Low Input/Output Voltage

Step-Up DC-DC Converter with

RESET

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

BATT

= 1.5V, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.) (Note 2)

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.

Note 1: LX has internal clamp diodes to PGND and OUT. Applications that forward bias these diodes should take care not to exceed the

IC’s package power-dissipation limits.

BATT, OUT, SHDN to GND ...................................-0.3V to +4.0V

RESET to GND..........................................-0.3V to (V

OUT

+ 0.3V)

PGND to GND .......................................................-0.3V to +0.3V

Switch Current (I

, I

OUT

, I

PGND

) (Note 1) .................-1A to +1A

Continuous Power Dissipation (T

= +70°C)

8-Pin TDFN (derate 24.4mW/°C

above +70°C)..........................................................1951.2mW

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

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

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

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Startup Voltage R

LOAD

= 1kΩ, T

= +25°C 0.8 0.95 V

Startup-Voltage Temperature

Coefficient

-2.1 mV/°C

Maximum Input Operating

Voltage

(Note 3) 3.6 V

Minimum Input Operating Voltage 0.7 V

MAX1947ETA18, I

LOAD

= 40mA 1.74 1.8 1.86

MAX1947ETA25, I

LOAD

= 32mA 2.42 2.5 2.58

MAX1947ETA30, I

LOAD

= 25mA 2.9 3.0 3.1

Output Voltage

MAX1947ETA33, I

LOAD

= 25mA 3.2 3.3 3.4

Load Regulation No load to full load 1.2 %

MAX1947ETA18 160 273

MAX1947ETA25 130 214

MAX1947ETA30 100 185

BATT

= 1V

MAX1947ETA33 100 169

MAX1947ETA25 240 380

MAX1947ETA30 200 361

Full-Load Output Current

BATT

= 1.8V

MAX1947ETA33 200 329

Supply Current into BATT No switching 2 4 µA

Supply Current into OUT No switching 70 110 µA

LX Switch Maximum On-Time 0.7 1 1.3 µs

LX Switch Minimum Off-Time 0.2 0.25 0.3 µs

Maximum On-Time to Minimum

Off-Time Ratio

3.6 4 4.6

Frequency in Startup 650 kHz

1 2 3 4 5 6 7 8 9 10

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