Rainbow-electronics MAX1774 Manual de usuario descargar pdf (Pagina 2)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Figure 1, V

= V

INS

+12V, V

INC

= V

CS-

= V

CS+

= +3.3V, V

CORE

= +1.8V, T

= 0°C to +85°C, unless otherwise noted. Typical values are at

= +25°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.

IN, SHDNM, MDRV, DBI, LBI, ACI,

CVH to GND.......................................................-0.3V to +30V

IN to CVH, PDRV......................................................-0.3V to +6V

BIN to CS-.................................................................-0.3V to +6V

LXB to GND................................................-0.3V to (V

BIN+ 0.7V)

PDRV to GND..................................(V

CVH

- 0.3V) to (V

+ 0.3V)

All Other Pins to GND...............................................-0.3V to +6V

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

Continuous Power Dissipation

28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW

32-Pin QFN (derate 23.2mW/°C above +70°C) ........1860mW

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

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage V

2.7 28 V

Input Quiescent Supply Current I

FBM

= +1.5V, V

FBC

= +1.5V,

SHDNM

= V

SHDNC

= +3.3V

18 40 µA

CS- Quiescent Supply Current I

CS-

FBM

= +1.5V, V

FBC

= +1.5V,

SHDNM

= V

SHDNC

= +3.3V

110 220

µA

Core Regulator Quiescent

Supply Current

INC

FBM

= +1.5V, V

FBC

= +1.5V,

SHDNM

= V

SHDNC

= +3.3V

105

µA

Backup Mode BIN Quiescent

Supply Current

BIN

= +3.3V, CS- open

FBM

= +1.5V, V

SHDNM

= +3.3V,

BKOFF

= +1.5V, SHDNC = GND

105

µA

IN Shutdown Supply Current SHDNM = SHDNC = GND 8 40 µA

MAIN REGULATOR

Main Output Voltage Adjust

Range

1.25

5.5 V

FBM Regulation Threshold V

FBM

(CS+ - CS-)

= 0 to +60mV,

= +3.5V to +28V

1.21 1.25 1.29

FBM Input Current I

FBM

= +1.3V

-0.1

0.1 µA

Current-Limit Threshold V

CS+

- V

CS-

60 80

100

Minimum Current-Limit

Threshold

CS+

- V

CS-

51525mV

Valley Current Threshold V

CS+

- V

CS-

40 50 60 mV

Zero Current Threshold V

CS+

- V

CS-

0515mV

PDRV, NDRV Gate Drive

Resistance

CS-

= +3.3V, I

PDRV

, I

NDRV

= 50mA 2 5.5 Ω

CS- to CVL Switch Resistance I

CVL

= 50mA 4.5 9.5 Ω

PDRV, NDRV Dead Time 50 ns

1 2 3 4 5 6 7 ... 20 21

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Rainbow-electronics MAX1774 Manual de usuario Pagina 2

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