Rainbow-electronics MAX1774 Manual de usuario descargar pdf (Pagina 6)

MAX1774

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

6 _______________________________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN MAX

UNITS

CORE REGULATOR

Input Voltage Range V

INC

2.6 5.5 V

INC

rising

2.39 2.55

INC Undervoltage Lockout

INC

falling

2.29 2.45

Core Output Voltage Adjust

Range

1.0 5.0 V

Maximum Core Load Current V

CORE

= 1.8V (Note 1) 1 A

FBC Regulation Threshold V

FBC

INC

= +2.5 to +5.5V,

OUTC

= 0 to 200mA

0.97 1.03

FBC Input Current I

FBC

= +1.3V

-0.1

0.1 µA

Dropout Voltage I

OUTC

= 400mA

0.25

LXC Leakage Current I

LXC

INC

= +5.5V, V

LXC

= 0 to +5.5V -10 10 µA

LXC P-Channel, N-Channel

On-Resistance

0.5 Ω

LXC P-Channel Current Limit

1200 3010

LXC P-Channel Minimum

Current

100 420

LXC N-Channel Valley Current

880 2450

LXC N-Channel Zero-Crossing

Current

170

Max Duty Cycle

100

Minimum On-Time

160 700

Minimum Off-Time

170 690

BACKUP REGULATOR

Backup Battery Input Voltage

BBATT

0.9 5.5 V

LXB N-Channel On Resistance V

CS-

= +3.3V, I

LXB

= 50mA 3.5 Ω

LXB Current Limit

200 600

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

1µA

BIN, CS- Switch Resistance

CS-

= +3.3V, BKOFF = GND,

SHDNC = CVL

15 Ω

BIN Switch Zero-Crossing

Threshold

BIN

= +2.5V, BKOFF = SHDNC =

SHDNM = CVL

35 mV

LXB Maximum On-Time 2.8 9.2 µs

REFERENCE

Reference Voltage V

REF

1.220 1.275

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

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)

1 2 3 4 5 6 7 8 9 10 11 ... 20 21

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Rainbow-electronics MAX1774 Manual de usuario Pagina 6

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