Rainbow-electronics MAX1775 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1775

Dual-Output Step-Down

DC-DC Converter for PDA/Palmtop Computers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +12V, V

MAIN

= V

INC

= V

CS-

= V

CS+

= +3.3V, V

CORE

= +1.8V, Circuit of Figure 4, T

= 0°C to +85°C, unless otherwise noted.

Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

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

Core Output Voltage Adjust

Range

1.0 5.0 V

Maximum Core Load Current (Note 1) 1 1.5 A

FBC Regulation Threshold V

FBC

INC

= +2.5 to +5.5V, I

OUTC

= 0 to 200mA 0.97 1.0 1.03 V

FBC Input Current I

FBC

= +1.3V -0.1 0.1 µA

Dropout Voltage (INC to LXC) I

OUTC

= 400mA 0.1 0.25 V

LXC Leakage Current I

LXC

INC

= +5.5V, V

LXC

= 0 to +5.5V -10 10 µA

LXC P-Channel, N-Channel

On-Resistance

0.25 0.5 Ω

LXC P-Channel Current Limit I

CLC

1200 1800 3000 mA

LXC P-Channel Minimum

Current

100 200 400 mA

LXC N-Channel Valley Current 900 1400 2400 mA

LXC N-Channel Zero-Crossing

Current

40 110 170 mA

LXC Dead Time 50 ns

Maximum Duty Cycle 100 %

Minimum On-Time 170 400 670 ns

Minimum Off-Time 170 400 670 ns

REFERENCE

Reference Voltage V

REF

1.23 1.25 1.27 V

Reference Load Regulation I

REF

= 0 to 50µA 10 mV

Reference Line Regulation V

- = +2.5V to +5.5V, I

REF

= 50µA 5 mV

Reference Sink Current I

REF

10 µA

CVL, CVH REGULATORS

CVL

= 50mA, V

= +2.7V, V

- = 0 2.6 2.8 3.1

CVL Output Voltage V

CVL

= 50mA, V

- = +3.3V 3.2

CVL Switchover Threshold V

CS-

rising, hysteresis = 100mV (typ) 2.40 2.47 2.55 V

= +4V, I

CVH

= 25mA V

- 3.4 V

- 2.8

CVH Output Voltage V

CVH

= +12V, I

CVH

= 50mA V

- 4.3 V

- 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

1 2 3 4 5 6 7 8 ... 14 15

Dual-Output Step-Down 1
QSOP.EPS 15

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