MAX8758ETG+T Maxim Integrated Products, MAX8758ETG+T Datasheet

IC REG STEP UP 24-TQFN

MAX8758ETG+T

Manufacturer Part Number
MAX8758ETG+T
Description
IC REG STEP UP 24-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8758ETGT.pdf (20 pages)

Specifications of MAX8758ETG+T

Applications
Converter, TFT, LCD
Voltage - Input
1.8 ~ 5.5 V
Number Of Outputs
1
Voltage - Output
5V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8758 includes a high-performance step-up regu-
lator, a high-speed operational amplifier, and a logic-
controlled, high-voltage switch-control block with pro-
grammable delay. The device is optimized for thin-film
transistor (TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC regulator provides the regulated sup-
ply voltage for the panel source driver ICs. The converter
is a high-frequency (640kHz/1.2MHz), current-mode regu-
lator with an integrated 14V n-channel power MOSFET.
The high-switching frequency allows the use of ultra-small
inductors and ceramic capacitors. The current-mode con-
trol architecture provides fast transient response to pulsed
loads. The regulator achieves efficiencies over 85% by
bootstrapping the supply rail of the internal gate driver
from the step-up regulator output. The step-up regulator
features undervoltage lockout (UVLO), soft-start, and
internal current limit. The high-current operational amplifier
is designed to drive the LCD backplane (VCOM). The
amplifier features high output current (±150mA), fast slew
rate (7.5V/µs), wide bandwidth (12MHz), and rail-to-rail
inputs and outputs.
The MAX8758 is available in a 24-pin, 4mm x 4mm, thin
QFN package with a maximum thickness of 0.8mm for
ultra-thin LCD panels. The device operates over the
-40°C to +85°C temperature range.
19-3699; Rev 1; 9/05
*EP = Exposed pad.
+Denotes lead-free package.
Pin Configuration appears at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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.
MAX8758ETG
MAX8758ETG+
PART
Notebook Displays
LCD Monitors
-40°C to +85°C
-40°C to +85°C
________________________________________________________________ Maxim Integrated Products
TEMP RANGE
Ordering Information
General Description
Step-Up Regulator with Switch Control
and Operational Amplifier for TFT LCD
PIN-PACKAGE
24 Thin QFN-EP*
4mm x 4mm
24 Thin QFN-EP*
4mm x 4mm
Applications
♦ 1.8V to 5.5V Input Voltage Range
♦ Input Undervoltage Lockout
♦ 0.5mA Quiescent Current
♦ 640kHz/1.2MHz Current-Mode Step-Up Regulator
♦ High-Speed Operational Amplifier
♦ Dual Mode™, Logic-Controlled, High-Voltage
♦ Thermal-Overload Protection
♦ 24-Pin, 4mm x 4mm, Thin QFN Package
Switch with Programmable Delay
V
GOFF
V
Fast Transient Response
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.5A, 115mΩ MOSFET
High Efficiency
Programmable Soft-Start
Current Limit with Lossless Sensing
Timer-Delay Fault Latch
±150mA Output Current
7.5V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
IN
FROM TCON
Simplified Operating Circuit
V
GON
IN
FREQ
SHDN
COMP
LDO
SS
MODE
CTL
DRN
GON
MAX8758
LX
PGND
SUPB
POSB
NEGB
OUTB
GND
OUT
THR
DLP
SRC
FB
TO VCOM
BACKPLANE
Features
V
MAIN
1

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MAX8758ETG+T Summary of contents

Page 1

... Exposed pad. +Denotes lead-free package. Pin Configuration appears at end of data sheet. Dual Mode is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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. ...

Page 2

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD ABSOLUTE MAXIMUM RATINGS IN, SHDN, CTL, LDO to GND ...................................-0.3V to +6V SUPB, LX, OUT to GND..........................................-0.3V to +14V OUTB, NEGB, POSB to GND ..................-0.3V to (SUPB + 0.3V) ...

Page 3

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD ELECTRICAL CHARACTERISTICS (continued +3V, OUT = +10V, FREQ = GND, T SHDN IN PARAMETER LX Leakage Current LX Current Limit Current-Sense Transresistance SS Source Current ...

Page 4

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD ELECTRICAL CHARACTERISTICS (continued +3V, OUT = +10V, FREQ = GND, T SHDN IN PARAMETER Output Voltage Swing High Output Voltage Swing Low Slew Rate -3dB ...

Page 5

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD ELECTRICAL CHARACTERISTICS (continued +3V, OUT = +10V, FREQ = GND, T SHDN IN PARAMETER Oscillator Maximum Duty Cycle FB Regulation Voltage FB Transconductance LX On-Resistance ...

Page 6

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD = 8.5V, FREQ = SHDN = IN, T (Circuit of Figure 3.3V MAIN STEP-UP REGULATOR EFFICIENCY vs. LOAD CURRENT (V = 8.5V) MAIN 95 ...

Page 7

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD = 8.5V, FREQ = SHDN = IN, T (Circuit of Figure 3.3V MAIN STEP-UP REGULATOR PULSED LOAD TRANSIENT RESPONSE L = 4.7µ ...

Page 8

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD = 8.5V, FREQ = SHDN = IN, T (Circuit of Figure 3.3V MAIN OP-AMP LARGE-SIGNAL STEP RESPONSE MAX8758 toc17 V OUTB 2V/div 1µs/div HIGH-VOLTAGE ...

Page 9

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD PIN NAME 1 GND Analog Ground Internal High-Voltage-Switch Common Connection. GON is the output of the high-voltage-switch- control block. GON is internally pulled to PGND through a 1kΩ resistor ...

Page 10

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD Typical Operating Circuit The typical operating circuit (Figure 1) of the MAX8758 is a power-supply solution for TFT LCD panels in note- book computers. The circuit generates a +8.5V ...

Page 11

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD V IN Figure 2. Functional Diagram Table 1. Component List DESIGNATION DESCRIPTION 3.3µF ±10%, 6.3V X5R ceramic capacitors C1, C2 (0603) TDK C1608X5R0J335M 4.7µF ±20%, 10V X5R ceramic capacitors ...

Page 12

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD Table 2. Component Suppliers SUPPLIER Fairchild Semiconductor Sumida TDK Toshiba The internal n-channel power MOSFET reduces the number of external components. The supply rail of the internal gate driver ...

Page 13

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD The soft-start timing can be adjusted with an external capacitor connected between SS and GND. After the step-up regulator is enabled, the SS pin is immediately charged to 0.5V. ...

Page 14

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD Activate the first mode by connecting MODE to LDO. When CTL is logic high, Q1 turns on and Q2 turns off, connecting GON to SRC. When CTL is logic ...

Page 15

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD DLP 0 REF REF R 50µA 4R MODE 1kΩ CTL Figure 4. Switch Control ______________________________________________________________________________________ REF 5µA FAULT Q4 SHDN REF_OK 1kΩ ...

Page 16

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD In Figure 1’s Typical Operating Circuit, the LCD’s gate- on and gate-off voltages are generated from two unreg- ulated charge pumps driven by the step-up regulator’s LX node. The ...

Page 17

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD Step-Up Regulator Input Capacitor Selection The input capacitor reduces the current peaks drawn from the input supply and reduces noise injection into the IC. Two 10µF ceramic capacitors are ...

Page 18

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD Charge-Pump Flying Capacitors Increasing the flying capacitor (C6, C17, C18) value lowers the effective source impedance and increases the output-current capability. Increasing the capaci- tance indefinitely has a negligible ...

Page 19

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD Pin Configuration TOP VIEW MAX8758 THIN QFN 4mm x 4mm ______________________________________________________________________________________ TRANSISTOR COUNT: ...

Page 20

... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Package Information ...

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