Rainbow-electronics MAX1774 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

_______________________________________________________________________________________ 3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Duty Cycle

100

Minimum On-Time

200 400 650

Minimum Off-Time

200 400 650

CORE REGULATOR

Input Voltage Range V

INC

2.6 5.5 V

INC

rising

2.40 2.47 2.55

INC Undervoltage Lockout

INC

falling

2.30 2.37 2.45

C or e Outp ut V ol tag e Ad j ust Rang e

1.0 5.0 V

Maximum Core Load Current V

CORE

= 1.8V (Note 1) 1 1.5 A

FBC Regulation Threshold V

FBC

INC

= +2.5 to +5.5V, I

O U T C

= 0 to 200mA

0.97

1.0

1.03

FBC Input Current I

FBC

= +1.3V

-0.1

0.1 µA

Dropout Voltage I

OUTC

= 400mA 0.1

0.25

LXC Leakage Current I

LXC

INC

= +5.5V, V

L X C

= 0 to +5.5V -10 10 µA

LXC P-Channel, N-Channel On-

Resistance

0.25

0.5 Ω

LXC P-Channel Current Limit I

CLC

1200 1800 3000

LX C P - C hannel M i ni m um C ur r ent

100 250 400

LXC N-Channel Valley Current

900 1400 2400

LXC N-Channel Zero-Crossing

Current

110 170

LXC Dead Time 50 ns

Max Duty Cycle

100

Minimum On-Time

170 400 690

Minimum Off-Time

170 400 690

BACKUP REGULATOR

Backup Battery Input Voltage

BBATT

0.9 5.5 V

LXB N-Channel On-Resistance V

CS-

= +3.3V, I

LXB

= 50mA 1.9 3.5 Ω

LXB Current Limit

200 350 600

LXB Leakage Current V

LXB

= +5.5V, V

FBM

= +1.3V 1 µA

BIN Leakage Current I

BIN

= +5.5V, CS- = BKOFF =

SHDNC = SHDNM = GND

1 µA

BIN, CS- Switch Resistance

CS-

= +3.3V, BKOFF = GND,

SHDNM = CVL

7.5 15 Ω

BIN Switch Zero-Crossing

Threshold

BIN

= + 2.5V , BKOFF = SHDNC =

SHDNM = C V L

17 35 mV

LXB Maximum On-Time 2.8 5.6 9.2 µs

Zero Crossing Detector Timeout

40 µs

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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