Rainbow-electronics MAX1774 Manual do Utilizador descarregar pdf (Página 4)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

4 _______________________________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

REFERENCE

Reference Voltage V

REF

1.23 1.25 1.27

Reference Load Regulation I

REF

= 0 to 50µA 10 mV

Reference Line Regulation V

CS-

= +2.5V to +5.5V, I

REF

= 50µA 5 mV

Reference Sink Current 10 µA

CVL, CVH REGULATORS

CVL

= 50mA, V

CS-

= 0 2.6 2.8 3.1

CVL Output Voltage V

CVL

= 50mA, V

CS-

= +3.3V 3.2

CVL Switchover Threshold CS- rising, hysteresis = 100mV typical

2.40 2.47 2.55

= +4V, I

CVH

= 25mA

3.4

2.8

CVH Output Voltage V

CVH

= +12V, I

CVH

= 50mA

4.2

3.7

CVH Switchover Threshold V

rising, hysteresis = 350mV typ 5.5 V

CVL

rising

2.40 2.47 2.55

CVL Undervoltage Lockout

CVL

falling

2.30 2.37 2.45

LOW-VOLTAGE COMPARATORS

BKOFF

rising

0.51 0.55 0.59

Backup Regulator Shutdown

Threshold

BKOFF

falling

0.46 0.50 0.54

BKOFF Input Bias Current V

BKOFF

= +5.5V 1 µA

LBI Threshold V

LBI

falling, hysteresis = 50mV typical

1.17 1.20 1.23

DBI Threshold V

DBI

falling, hysteresis = 50mV typical

1.17 1.20 1.23

BKUP Low-Input Threshold 0.4 V

LBI, DBI Input Leakage Current V

LBI

= V

DBI

= +1.3V

100

LBO, BKUP, ACO, MDRV

Output Low

SINK

= 1mA 0.4 V

LBO, BKUP, ACO, MDRV

Output Leakage Current

LBI

= +1.3V, V

ACI

= +12V, V

ACO

LBO

= V

BKUP

= +5.5V, V

MDRV

= +28V

1.0 µA

ACI Threshold V

ACI

– V

INS,

ACI falling

0.22 0.35

ACI Input Leakage Current V

ACI

= +1.3V

100

INS Input Leakage Current V

INS

= +3.3V 1.5 10 µA

LOGIC INPUTS

SHDNM, SHDNC Input Low

Voltage

0.4 V

SHDNM, SHDNC Input High

Voltage

2.0 V

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.)

1 2 3 4 5 6 7 8 9 ... 20 21

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