Rainbow-electronics MAX1774 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

_______________________________________________________________________________________ 5

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SHDNM, SHDNC Input Low

Current

SHDNM = SHDNC = GND -1 1 µA

SHDNC Input High Current V

SHDNC

= +5.5V 5 µA

SHDNM Input High Current V

SHDNM

= +5V 2 25 µA

ELECTRICAL CHARACTERISTICS

(Figure 1, V

= V

INS

= +12V, V

INC

= V

CS-

= V

CS+

= +3.3V, V

CORE

= +1.8V, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

Input Voltage V

2.7 28 V

Input Quiescent Supply Current I

FBM

= +1.5V, V

FBC

= +1.5V, V

SHDNM

SHDNC

= +3.3V

40 µA

CS- Quiescent Supply Current I

CS-

FBM

= +1.5V, V

FBC

= +1.5V, V

SHDNM

SHDNC

= +3.3V

220

µA

Core Regulator Quiescent

Supply Current

INC

FBM

= +1.5V, V

FBC

= +1.5V, V

SHDNM

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

110

µA

IN Shutdown Supply Current SHDNM = SHDNC = GND 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 1.29

FBM Input Current I

FBM

= +1.3V

-0.1

0.1 µA

Current-Limit Threshold V

CS+

- V

CS-

100

Minimum Current-Limit

Threshold

CS+

- V

CS-

525mV

Valley Current Threshold V

CS+

- V

CS-

40 60 mV

Zero Current Threshold V

CS+

- V

CS-

015mV

PDRV, NDRV Gate Drive

Resistance

CS-

= +3.3V, I

PDRV

, I

NDRV

= 50mA 5.5 Ω

CS- to CVL Switch Resistance I

CVL

= 50mA 9.5 Ω

Maximum Duty Cycle

100

Minimum On-Time

200 650

Minimum Off-Time

200 650

ELECTRICAL CHARACTERISTICS (continued)

(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 T

= +25°C.)

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