Rainbow-electronics MAX1774 Manual do Utilizador descarregar pdf (Página 7)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

_______________________________________________________________________________________ 7

PARAMETER

SYMBOL

CONDITIONS

MIN MAX

UNITS

CVL, CVH REGULATORS

CVL Output Voltage V

CVL

= 50mA, V

CS-

= 0 2.6 3.1 V

CVL Switchover Threshold V

CS-

rising, hysteresis = 100mV typical

2.40 2.55

= +4V, I

CVH

= 25mA

- 2.8

CVH Output Voltage V

CVH

= +12V, I

CVH

= 50mA

- 3.65

CVL

rising

2.40 2.57

CVL Undervoltage Lockout

CVL

falling

2.30 2.47

LOW-VOLTAGE COMPARATORS

BKOFF

rising

0.51 0.59

Backup Regulator Shutdown

Threshold

BKOFF

falling

0.46 0.54

BKOFF Input Bias Current V

BKOFF

= +5.5V 1 µA

LBI Threshold V

LBI

falling, hysteresis = 50mV typical

1.17 1.23

DBI Threshold V

DBI

falling, hysteresis = 50mV typical

1.17 1.23

BKUP Low-Input Threshold 0.4 V

LBI, DBI Input Leakage Current V

LBI

, V

DBI

= +28V

100

LBO, BKUP, ACO, MDRV

Output Low

SINK

= 1mA 0.4 V

LBO, BKUP, ACO, MDRV

Output Leakage Current

LBI

= +1.3V, V

ACI

= V

= +12V, V

ACO

LBO

= V

BKUP

= +5.5V, V

MDRV

= +28V

1.0 µA

ACI Threshold V

ACI

- V

INS

, ACI falling 0.5 V

ACI Input Leakage Current V

ACI

= +1.3V

100

MAIN Input Leakage Current V

INS

= +3.3V 10 µA

LOGIC INPUTS

SHDNM, SHDNC Input Low

Voltage

0.4 V

SHDNM, SHDNC Input High

Voltage

2.0 V

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

= +28V 25 µA

ELECTRICAL CHARACTERISTICS (continued)

(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)

Note 1: This parameter is guaranteed based on the LXC P-channel current limit and the LXC N-channel valley current.

Note 2: Specifications to -40°C are guaranteed by design and not production tested.

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