Rainbow-electronics MAX8758 Bedienungsanleitung PDF herunterladen (Seite 5)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

FREQ = GND 91 99

Oscillator Maximum Duty Cycle

FREQ = IN 88 96

FB Regulation Voltage

1.220 1.252

FB Transconductance ∆I = 5µA at COMP 75

280

µS

LX On-Resistance I

= 200mA

200

mΩ

LX Current Limit 65% duty cycle 2.0 3.0 A

POSITIVE GATE DRIVER TIMING AND CONTROL SWITCHES

SRC Input Voltage Range 28 V

SRC Input Current MODE

= DLP = CTL = LDO

250

µA

DRN Input Current MODE = DLP = LDO, V

DRN

= 8V, V

CTL

= 0

250

µA

SRC-to-GON Switch On-Resistance DLP = CTL = LDO 30 Ω

DRN-to-GON Switch On-Resistance DLP = LDO, V

CTL

= 0

130

Ω

THR-to-GON Voltage Gain V

GON

= 12V, V

THR

= 1.2V 9.7

10.3

V/V

OPERATIONAL AMPLIFIER

SUPB Supply Range 4.5

13.0

SUPB Supply Current Buffer configuration, V

POSB

= 4V, no load 1.0 mA

Input Offset Voltage V

NEGB

, V

POSB

= V

SUPB

/ 2 18 mV

Input Common-Mode Voltage Range

SUPB

OUTB

= 100µA

SUPB

- 15

Output Voltage Swing High

OUTB

= 5mA

SUPB

- 150

OUTB

= -100µA 15

Output Voltage Swing Low

OUTB

= -5mA

150

OUTB shorted to V

SUPB

/2, sourcing 75

Short-Circuit Current

OUTB shorted to V

SUPB

/2, sinking 75

MAX8758

Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

= V

SHDN

= +3V, OUT = +10V, FREQ = GND, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

Note 1: OUT and SUP can operate down to 4.5V. LDO will be out of regulation, but IC will function correctly.

Note 2: -40°C specs are guaranteed by design, not production tested.

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