Rainbow-electronics MAX8758 Manual do Utilizador descarregar pdf (Página 3)

MAX8758

Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= V

SHDN

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

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

LX Leakage Current V

= 13V

0.01

20 µA

LX Current Limit 65% duty cycle 2.0 2.5 3.0 A

Current-Sense Transresistance

0.19

0.3

0.40

V/A

SS Source Current 3.0 4.0 5.5 µA

POSITIVE GATE DRIVER TIMING AND CONTROL SWITCHES

CTL Input Low Voltage V

= 1.8V to 5.5V 0.6 V

= 1.8V to 2.4V 1.4

CTL Input High Voltage

= 2.4V to 5.5V 2.0

CTL Input Leakage Current V

CTL

= 0 or V

-1 +1 µA

GON rising, V

MODE

= 1.24V, V

CTL

= 0 to 3V step,

no load on GON

100

CTL-to-SRC Propagation Delay

GON falling, V

MODE

= 1.24V, V

CTL

= 3V to 0 step,

no load on GON

100

SRC Input Voltage

DLP

= 0, V

= 3V

2500

Ω

SRC Input Current MODE

= DLP = CTL = LDO

150

250 µA

DRN Input Current MODE = DLP = LDO, V

DRN

= 8V, V

CTL

= 0

150

250 µA

SRC-to-GON Switch On-Resistance DLP = CTL = LDO 15 30 Ω

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

CTL

= 0 65 130 Ω

GON-to-PGND Switch On-Resistance

DLP

= 0, V

= 3V

2500

Ω

MODE Switch On-Resistance V

DLP

= 0, V

= 3V

1000

Ω

MODE 1 Voltage Threshold MODE rising

0.9 x

LDO

MODE Capacitor Charge Current

(MODE 2)

MODE

= 1.5V 40 50 62 µA

MODE 2 Switch Transition Voltage

Threshold

GON connected to DRN 2.3 2.5 2.7 V

MODE Current-Source Stop

Threshold

MODE rising 3.3 3.5 3.7 V

DLP Capacitor Charge Current During startup, V

DLP

= 1.0V 4 5 6 µA

DLP Turn-On Threshold

2.375 2.500 2.625

THR-to-GON Voltage Gain V

GON

= 12V, V

THR

= 1.2V 9.7

10.0 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, T

= +25°C 12 mV

Input Bias Current V

NEGB

, V

POSB

= V

SUPB

/2 -50

+50

Input Common-Mode Voltage Range

SUPB

1 2 3 4 5 6 7 8 ... 19 20

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