MAX8795AGCJ(2007) Просмотр технического описания (PDF) - Maxim Integrated

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MAX8795AGCJ
(Rev.:2007)

TFT-LCD DC-DC Converter with Operational Amplifiers

Maxim Integrated 

TFT-LCD DC-DC Converter with

Operational Amplifiers

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 3V, VMAIN = VSUP = 14V, PGND = AGND = BGND = 0, IREF = 25µA, TA = 0°C to +85°C. Typical values are at TA = +25°C,

unless otherwise noted.)

PARAMETER

FB Transconductance

FB Voltage Gain

LX On-Resistance

LX Leakage Current

LX Current Limit

Current-Sense Transresistance

Soft-Start Period

Soft-Start Step Size

SYMBOL

RLX(ON)

ILX

ILIM

CONDITIONS

∆ICOMP = ±2.5µA

From FB to COMP

ILX = 200mA

VLX = 19V

VFB = 1.2V, duty cycle = 75%

tSS

OPERATIONAL AMPLIFIERS

SUP Supply Range

SUP Overvoltage Fault Threshold

SUP Supply Current

Input Offset Voltage

Input Bias Current

Input Common-Mode Voltage

Range

Common-Mode Rejection Ratio

Open-Loop Gain

VSUP

ISUP

VOS

IBIAS

VCM

CMRR

Buffer configuration, VPOS_ = VSUP / 2,

no load

(VNEG_, VPOS_, VOUT_) ≅ VSUP / 2

(VNEG_ , VPOS_, VOUT_) ≅ VSUP / 2

0 ≤ (VNEG_, VPOS_) ≤ VSUP

Output Voltage Swing, High

VOH

IOUT_ = 5mA

Output Voltage Swing, Low

Short-Circuit Current

Power-Supply Rejection Ratio

Slew Rate

VOL

PSRR

IOUT_ = -5mA

To VSUP / 2, source or sink

DC, 6V ≤ VSUP ≤ 18V,

(VNEG_, VPOS_) ≅ VSUP / 2

-3dB Bandwidth

RL = 10kΩ, CL = 10pF, buffer configuration

GATE-ON LINEAR-REGULATOR CONTROLLER

FBP Regulation Voltage

FBP Fault Trip Level

FBP Input Bias Current

VFBP

IFBP

IDRVN = 100µA

VFBP falling

VFBP = 1.25V

FBP Effective Load-Regulation

Error (Transconductance)

VDRVP = 10V, IDRVP = 50µA to 1mA

FBP Line (IN) Regulation Error

DRVP Sink Current

DRVP Off-Leakage Current

Soft-Start Period

IDRVP

tSS

IDRVP = 100µA, 2.5V < VIN < 6V

VFBP = 1.1V, VDRVP = 10V

VFBP = 1.4V, VDRVP = 34V

Soft-Start Step Size

MIN TYP MAX

75

160 280

700

160 260

10

20

2.5

3.0

3.5

0.1

0.2

0.3

14

VREF /

128

6.0

18.0

18.0

19

19.9

3.5

5.0

0

12

-50

0

+50

0

VSUP

45

80

125

VSUP - VSUP -

100

50

50

100

75

130

60

45

20

1.231

0.96

-50

1.250

1.00

1.269

1.04

+50

-0.7 -1.5

±1

±10

1

5

0.01

10

14

VREF /

128

UNITS

µS

V/ V

mΩ

µA

A

V/A

ms

V

V

V

mA

mV

nA

V

dB

dB

mV

mV

mA

dB

V/µs

MHz

V

V

nA

%

mV

mA

µA

ms

V

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