MAX1518BETJ+T Maxim Integrated Products, MAX1518BETJ+T Datasheet

IC DC-DC CONV TFT-LCD 32-TQFN

MAX1518BETJ+T

Manufacturer Part Number
MAX1518BETJ+T
Description
IC DC-DC CONV TFT-LCD 32-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1518BETJT.pdf (25 pages)

Specifications of MAX1518BETJ+T

Applications
Converter, TFT, LCD
Voltage - Input
2.6 ~ 6.5 V
Number Of Outputs
1
Voltage - Output
2.6 ~ 13 V
Operating Temperature
-40°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
32-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1518B includes a high-performance step-up
regulator, two linear-regulator controllers, and high-cur-
rent operational amplifiers for active-matrix, thin-film tran-
sistor (TFT), liquid-crystal displays (LCDs). Also included
is a logic-controlled, high-voltage switch with adjustable
delay.
The step-up DC-DC converter provides the regulated
supply voltage for the panel source driver ICs. The con-
verter is a high-frequency (1.2MHz) current-mode regu-
lator with an integrated 14V n-channel MOSFET that
allows the use of ultra-small inductors and ceramic
capacitors. It provides fast transient response to pulsed
loads while achieving efficiencies over 85%.
The gate-on and gate-off linear-regulator controllers
provide regulated TFT gate-on and gate-off supplies
using external charge pumps attached to the switching
node. The MAX1518B includes five high-performance
operational amplifiers. These amplifiers are designed to
drive the LCD backplane (VCOM) and/or the gamma-
correction divider string. The device featureS high out-
put current (±150mA), fast slew rate (13V/µs), wide
bandwidth (12MHz), and rail-to-rail inputs and outputs.
The MAX1518B is available in a 32-pin thin QFN pack-
age with a maximum thickness of 0.8mm for ultra-thin
LCD panels.
19-3244; Rev 0; 10/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX1518BETJ
PART
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
RANGE
-40°C to
+100°C
TEMP
________________________________________________________________ Maxim Integrated Products
Ordering Information
General Description
32 Thi n QFN 5m m x 5m m
PIN-PACKAGE
Applications
TFT-LCD DC-DC Converter with
T3255-4
CODE
PKG
♦ 2.6V to 6.5V Input Supply Range
♦ 1.2MHz Current-Mode Step-Up Regulator
♦ Linear-Regulator Controllers for V
♦ High-Performance Operational Amplifiers
♦ Logic-Controlled, High-Voltage Switch with
♦ Timer-Delay Fault Latch for All Regulator Outputs
♦ Thermal-Overload Protection
♦ 0.6mA Quiescent Current
Pin Configuration appears at end of data sheet.
Operational Amplifiers
Adjustable Delay
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.4A, 0.16Ω n-Channel MOSFET
High Efficiency (90%)
±150mA Output Short-Circuit Current
13V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
V
IN
Minimal Operating Circuit
IN
COMP
SRC
COM
DRN
SUP
NEG1
OUT1
POS1
NEG2
OUT2
POS2
OUT3
POS3
OP1
OP2
OP3
V
CN
CONTROLLER
CONTROLLER
GATE-ON
CONTROL
STEP-UP
SWITCH
MAX1518B
CONTROLLER
GATE-OFF
BGND
REF
OP4
OP5
LX
PGND
AGND
DRVP
DRVN
NEG4
OUT4
POS4
NEG5
OUT5
POS5
FBN
FBP
DEL
CTL
REF
FB
GON
V
CP
Features
V
MAIN
and V
V
V
V
V
CP
GON
CN
GOFF
GOFF
1

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MAX1518BETJ+T Summary of contents

Page 1

... PIN-PACKAGE RANGE -40°C to MAX1518BETJ 32 Thi n QFN +100°C ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. TFT-LCD DC-DC Converter with Operational Amplifiers ♦ 2.6V to 6.5V Input Supply Range ♦ 1.2MHz Current-Mode Step-Up Regulator Fast Transient Response to Pulsed Load High-Accuracy Output Voltage (1 ...

Page 2

TFT-LCD DC-DC Converter with Operational Amplifiers ABSOLUTE MAXIMUM RATINGS IN, CTL to AGND ......................................................-0.3V to +7V COMP, FB, FBP, FBN, DEL, REF to AGND ....-0. PGND, BGND to AGND ......................................................±0. PGND ............................................................-0.3V to +14V SUP to ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3V 8V, PGND = AGND = BGND = SUP wise noted.) PARAMETER SYMBOL LX On-Resistance R LX Leakage Current LX Current Limit Current-Sense Transconductance Soft-Start Period Soft-Start Step Size OPERATIONAL ...

Page 4

TFT-LCD DC-DC Converter with Operational Amplifiers ELECTRICAL CHARACTERISTICS (continued 3V 8V, PGND = AGND = BGND = SUP wise noted.) FBP Line (IN) Regulation Error DRVP Sink Current I DRVP DRVP Off-Leakage Current ...

Page 5

ELECTRICAL CHARACTERISTICS ( 8V, PGND = AGND = BGND = SUP PARAMETER SYMBOL IN Supply Range IN Undervoltage-Lockout Threshold IN Quiescent Current REF Output Voltage MAIN STEP-UP REGULATOR Output Voltage Range Operating Frequency ...

Page 6

TFT-LCD DC-DC Converter with Operational Amplifiers ELECTRICAL CHARACTERISTICS (continued 3V 8V, PGND = AGND = BGND = SUP FBP Effective Load-Regulation Error (Transconductance) FBP Line (IN) Regulation Error DRVP Sink Current I DRVP ...

Page 7

Figure 5V 13V MAIN unless otherwise noted.) STEP-UP EFFICIENCY vs. LOAD CURRENT 100 13V OUT ...

Page 8

TFT-LCD DC-DC Converter with Operational Amplifiers (Circuit of Figure 5V 13V MAIN unless otherwise noted.) GATE-ON REGULATOR LINE REGULATION 0.2 0 -0.2 -0.4 -0 23.5V GON -0 20mA GON ...

Page 9

Figure 5V 13V MAIN unless otherwise noted.) OPERATIONAL-AMPLIFIER LOAD-TRANSIENT RESPONSE MAX1518B toc15 0V +50mA 0 -50mA 400ns/div A: OUTPUT VOLTAGE, 1V/div, AC-COUPLED B: OUTPUT CURRENT, 50mA/div PIN NAME Switch Input. Source ...

Page 10

TFT-LCD DC-DC Converter with Operational Amplifiers PIN NAME 17 OUT4 Operational-Amplifier 4 Output 18 POS5 Operational-Amplifier 5 Noninverting Input 19 NEG5 Operational-Amplifier 5 Inverting Input 20 OUT5 Operational-Amplifier 5 Output n-Channel Power MOSFET Drain and Switching Node. Connect the inductor ...

Page 11

Typical Operating Circuit The MAX1518B Typical Operating Circuit (Figure complete power-supply system for TFT LCDs. The cir- cuit generates a +13V source-driver supply and +24V and -8V gate-driver supplies. The input voltage range for the IC is ...

Page 12

TFT-LCD DC-DC Converter with Operational Amplifiers V IN 4.5V TO 5.5V C1 22µF R10 10Ω C18 0.1µF 180kΩ 220µF LX 0.1µF 6.8kΩ 0.1µ 332kΩ GOFF -8V/50mA 0.22µF R8 40.2kΩ 1% 0.22µF 0.033µF TO VCOM BACKPLANE ...

Page 13

V IN Figure 2. MAX1518B Functional Diagram ______________________________________________________________________________________ TFT-LCD DC-DC Converter with Operational Amplifiers STEP-UP CONTROLLER PGND COMP AGND MAX1518B DRVP GATE-ON CONTROLLER FBP SRC DEL COM SWITCH CONTROL CTL DRN DRVN GATE-OFF CONTROLLER SUP ...

Page 14

TFT-LCD DC-DC Converter with Operational Amplifiers CLOCK OSCILLATOR TO FAULT LATCH Figure 3. Step-Up Regulator Functional Diagram This discharge condition forces the current through the inductor to ramp back down, transferring the energy stored in the magnetic field to the ...

Page 15

V MAIN DRVP NPN CASCODE TRANSISTOR MAX1518B FBP Figure 4. Using Cascoded npn for Charge-Pump Output Voltages > 28V Gate-Off Linear-Regulator Controller, REG N The gate-off linear-regulator controller (REG analog gain block with an open-drain p-channel output. ...

Page 16

TFT-LCD DC-DC Converter with Operational Amplifiers Undervoltage Lockout (UVLO) The undervoltage-lockout (UVLO) circuit compares the input voltage at IN with the UVLO threshold (2.5V rising, 2.30V falling, typ) to ensure the input voltage is high enough for reliable operation. The ...

Page 17

IN 5µA DEL REF CTL Figure 7. Switch-Control Block During steady-state operation, if the output of the main regulator or any of the linear-regulator outputs does not exceed its respective fault-detection threshold, the MAX1518B activates an internal fault timer. If ...

Page 18

TFT-LCD DC-DC Converter with Operational Amplifiers Design Procedure Main Step-Up Regulator The minimum inductance value, peak current rating, and series resistance are factors to consider when selecting the inductor. These factors influence the con- verter’s efficiency, maximum output load capability, ...

Page 19

Output-Capacitor Selection The total output voltage ripple has two components: the capacitive ripple caused by the charging and discharg- ing of the output capacitance, and the ohmic ripple due to the capacitor’s equivalent series resistance (ESR ...

Page 20

TFT-LCD DC-DC Converter with Operational Amplifiers STEP-UP CONTROLLER PGND MAX1518B Figure 8. Operation with Output Voltages >13V Using Cascoded MOSFET The number of negative charge-pump stages is given by: − GOFF DROPOUT = ...

Page 21

POSITIVE CHARGE-PUMP OUTPUT VOLTAGE vs 3-STAGE CHARGE PUMP 2-STAGE CHARGE PUMP 1-STAGE CHARGE PUMP (V) MAIN Figure 9. Positive Charge-Pump Output ...

Page 22

TFT-LCD DC-DC Converter with Operational Amplifiers The transconductance amplifier regulates the output voltage by controlling the pass transistor’s base cur- rent. The total DC loop gain is approximately:     ×  BIAS ≅  × ...

Page 23

Applications Information Power Dissipation An IC’s maximum power dissipation depends on the thermal resistance from the die to the ambient environ- ment and the ambient temperature. The thermal resis- tance depends on the IC package, PC board copper area, other ...

Page 24

TFT-LCD DC-DC Converter with Operational Amplifiers TOP VIEW AGND PGND OUT1 NEG1 POS1 OUT2 24 ______________________________________________________________________________________ SRC 1 REF MAX1518B ...

Page 25

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25 © 2005 Maxim Integrated Products ...

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