MAX8742 Просмотр технического описания (PDF) - Maxim Integrated

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MAX8742

500kHz Multi-Output Power-Supply Controllers with High Impedance in Shutdown

Maxim Integrated 

500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

ABSOLUTE MAXIMUM RATINGS

V+ to GND ..............................................................-0.3V to +36V

PGND to GND.....................................................................±0.3V

VL to GND ................................................................-0.3V to +6V

BST3, BST5 to GND ..............................................-0.3V to +36V

CSH3, CSH5 to GND................................................-0.3V to +6V

FB3 to GND ..............................................-0.3V to (CSL3 + 0.3V)

FB5 to GND ...............................................-0.3V to (CSL5 +0.3V)

LX3 to BST3..............................................................-6V to +0.3V

LX5 to BST5..............................................................-6V to +0.3V

REF, SYNC, SEQ, STEER, SKIP,

TIME/ON5, SECFB, RESET to GND ..........-0.3V to (VL + 0.3V)

VDD to GND. ...........................................................-0.3V to +20V

RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V)

12OUT to GND ..........................................-0.3V to (VDD + 0.3V)

DL3, DL5 to PGND........................................-0.3V to (VL + 0.3V)

DH3 to LX3 ..............................................-0.3V to (BST3 + 0.3V)

DH5 to LX5 ..............................................-0.3V to (BST5 + 0.3V)

VL, REF Short to GND ................................................Momentary

12OUT Short to GND..................................................Continuous

REF Current...........................................................+5mA to -1mA

VL Current.........................................................................+50mA

12OUT Current . .............................................................+200mA

VDD Shunt Current. ...........................................................+15mA

Continuous Power Dissipation (TA = +70°C)

28-Pin SSOP (derate 9.52mW/°C above +70°C) ........762mW

32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ....1702mW

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

Storage Temperature Range ............................-65°C to +160°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

(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0, REF load = 0, SKIP = 0, TA = 0°C to +85°C, unless otherwise noted. Typical

values are at TA = +25°C.)

PARAMETER

MAIN SMPS CONTROLLERS

Input Voltage Range

3V Output Voltage in Adjustable Mode

3V Output Voltage in Fixed Mode

5V Output Voltage in Adjustable Mode

5V Output Voltage in Fixed Mode

Output Voltage Adjust Range

Adjustable-Mode Threshold Voltage

Load Regulation

Line Regulation

Current-Limit Threshold

Idle-Mode Threshold

Soft-Start Ramp Time

Oscillator Frequency

CONDITIONS

V+ = 4.2V to 30V, CSH3 - CSL3 = 0,

CSL3 connected to FB3

V+ = 4.2V to 30V, 0 < CSH3 - CSL3

< 80mV, FB3 = 0

V+ = 4.2V to 30V, CSH5 - CSL5 = 0,

CSL5 connected to FB5

V+ = 5.3V to 30V, 0 < CSH5 - CSL5

< 80mV, FB5 = 0

Either SMPS

Dual-mode comparator

Either SMPS, 0 < CSH_ - CSL_ < 80mV

Either SMPS, 5.2V < V+ < 30V

CSH3 - CSL3 or CSH5 - CSL5

SKIP = VL or VDD < 13V or SECFB < 2.44V

SKIP = 0, not tested

From enable to 95% full current limit with

respect to fOSC (Note 1)

SYNC = VL

SYNC = 0

MIN TYP MAX UNITS

4.2

30.0

V

2.42

2.5

2.58

V

3.20 3.39 3.47

V

2.42

2.5

2.58

V

4.85 5.13 5.25

V

REF

5.5

V

0.5

1.1

V

-2

%

0.03

%/V

80

100

120

mV

-50 -100 -150

10

25

40

mV

512

Clks

450

500

550

kHz

283

333

383

2 _______________________________________________________________________________________

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