Rainbow-electronics MAX8668 Uživatelský manuál stáhnout pdf (Strana 2)

MAX8667/MAX8668

1.5MHz Dual Step-Down DC-DC Converters

with Dual LDOs and Individual Enables

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

IN34

= V

IN12

= 3.6V, T

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

= +25°C.) (Note 1)

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.

IN12, IN34, FB1, FB2, EN1, EN2, EN3, EN4, OUT1,

OUT2, REF to GND............................................-0.3V to +6.0V

OUT3,

OUT4 to GND.....-0.3V to the lesser of + 6V or (V

IN34

+ 0.3V)

PGND1, PGND2 to GND .......................................-0.3V to +0.3V

LX1, LX2 Current ..........................................................1.5A RMS

LX1, LX2 to GND (Note 1) .......................-0.3V to (V

IN12

+ 0.3V)

Continuous Power Dissipation (T

= +70°C)

16-Pin, 3mm x 3mm Thin QFN

(derate 20.8mW/°C above +70°C).............................1667mW

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

IN34 Supply Range V

IN12

≥ V

IN34

1.7 5.5 V

IN12 Supply Range MAX8668, V

IN12

≥ V

IN34

2.6 5.5 V

IN12 Suppy Range MAX8667, V

IN12

≥ V

IN34

2.8 5.5 V

= +25°C 1 µA

Shutdown Supply Current,

IN12

+ I

IN34

IN12

= V

IN34

= 4.2V V

EN_

= 0V

= +85°C 0.05 µA

No Load Supply Current,

IN12

+ I

IN34

MAX8667ETEJS+, all regulators enabled 100 150 µA

UNDERVOLTAGE LOCKOUT

IN12

rising 2.4 2.5 2.6 V

IN12 UVLO

IN12

hysteresis 0.1 V

IN34

rising 1.5 1.6 1.7 V

IN34 UVLO

IN34

hysteresis 0.1 V

THERMAL SHUTDOWN

Threshold T

rising +160 °C

Hysteresis 15 °C

REFERENCE

Reference Bypass Output

Voltage

0.591 0.600 0.609 V

REF Supply Rejection 2.6V ≤ (V

IN12

= V

IN34

) ≤ 5.5V 0.15 mV/V

LOGIC AND CONTROL INPUTS

EN_ Input Low Level

1.7V ≤ V

IN34

≤ 5.5V

2.6V ≤ V

IN12

≤ 5.5V

0.4 V

EN_ Input High Level

1.7V ≤ V

IN34

≤ 5.5V

2.6V ≤ V

IN12

≤ 5.5V

1.44 V

= +25°C -1 +1

EN_ Input Leakage Current V

IN12

= V

IN34

= 5.5V

= +85°C 0.001

µA

STEP-DOWN CONVERTERS

Minimum Adjustable Output

Voltage

MAX8668 0.6 V

Note 1: LX_ has internal clamp diodes to GND and IN12. Applications that forward bias these diodes should take care not to exceed

the IC’s package-dissipation limits.

1 2 3 4 5 6 7 ... 17 18

MAX8667/MAX8668 1

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