MAX1517ETJ+ Maxim Integrated Products, MAX1517ETJ+ Datasheet

IC DC/DC CONV TFT-LCD 32-TQFN

MAX1517ETJ+

Manufacturer Part Number
MAX1517ETJ+
Description
IC DC/DC CONV TFT-LCD 32-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1517ETJ.pdf (26 pages)

Specifications of MAX1517ETJ+

Applications
LCD Display, Automotive
Voltage - Supply
2.6 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The MAX1516/MAX1517/MAX1518 include a high-perfor-
mance step-up regulator, two linear-regulator controllers,
and high-current operational amplifiers for active-matrix
thin-film transistor (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 MAX1518 includes five high-performance
operational amplifiers, the MAX1517 includes three,
and the MAX1516 includes one operational amplifier.
These amplifiers are designed to drive the LCD back-
plane (VCOM) and/or the gamma-correction divider
string. The devices feature high output current
(±150mA), fast slew rate (13V/µs), wide bandwidth
(12MHz), and rail-to-rail inputs and outputs.
The MAX1516/MAX1517/MAX1518 are available in 32-
pin thin QFN packages with a maximum thickness of
0.8mm for ultra-thin LCD panels.
19-3244; Rev 0; 4/04
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.
MAX1516ETJ
MAX1517ETJ
MAX1518ETJ
PART
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
-40 C to +100 C
-40 C to +100 C
-40 C to +100 C
TEMP RANGE
________________________________________________________________ Maxim Integrated Products
Ordering Information
General Description
PIN-PACKAGE
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
Applications
TFT-LCD DC-DC Converters with
Pin Configurations appear at end of data sheet.
Operational Amplifiers
2.6V to 5.5V 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
Adjustable Delay
Timer-Delay Fault Latch for All Regulator Outputs
Thermal-Overload Protection
0.6mA Quiescent Current
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
MAX1518
CONTROLLER
GATE-OFF
BGND
REF
OP4
OP5
LX
PGND
AGND
DRVP
DRVN
NEG4
OUT4
POS4
NEG5
OUT5
POS5
FBP
DEL
CTL
FBN
REF
FB
GON
V
CP
Features
V
MAIN
and V
V
V
V
V
CP
GON
CN
GOFF
GOFF
1

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MAX1517ETJ+ Summary of contents

Page 1

... C to +100 C 32 Thin QFN 5mm x 5mm MAX1518ETJ - +100 C 32 Thin QFN 5mm x 5mm ________________________________________________________________ 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 Converters with Operational Amplifiers 2.6V to 5.5V Input Supply Range 1 ...

Page 2

TFT-LCD DC-DC Converters with Operational Amplifiers ABSOLUTE MAXIMUM RATINGS IN, CTL to AGND ......................................................-0.3V to +6V 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 Converters with Operational Amplifiers ELECTRICAL CHARACTERISTICS (continued 3V 8V, PGND = AGND = BGND = SUP wise noted.) PARAMETER SYMBOL FBP Line (IN) Regulation Error DRVP Sink Current I DRVP DRVP ...

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 Converters with Operational Amplifiers ELECTRICAL CHARACTERISTICS (continued 3V 8V, PGND = AGND = BGND = SUP PARAMETER SYMBOL FBP Effective Load-Regulation Error (Transconductance) FBP Line (IN) Regulation Error DRVP Sink Current ...

Page 7

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

Page 8

TFT-LCD DC-DC Converters with Operational Amplifiers (Circuit of Figure 5V 13V MAIN unless otherwise noted.) TIMER DELAY LATCH RESPONSE TO OVERLOAD MAX1516 toc06 55ms 0A 10ms/div 5V/div ...

Page 9

Figure 5V 13V MAIN unless otherwise noted.) POWER-UP SEQUENCE MAX1516 toc12 4ms/div 10V/div MAIN 20V/div SRC C: ...

Page 10

TFT-LCD DC-DC Converters with Operational Amplifiers NAME PIN MAX1516 MAX1517 MAX1518 1 SRC SRC SRC 2 REF REF REF 3 AGND AGND AGND 4 PGND PGND PGND 5 OUT1 OUT1 OUT1 6 NEG1 NEG1 NEG1 7 POS1 POS1 POS1 8 ...

Page 11

NAME PIN MAX1516 MAX1517 MAX1518 20 N.C. N.C. OUT5 COMP COMP COMP 25 FBP FBP FBP 26 DRVP DRVP DRVP 27 FBN FBN FBN 28 DRVN DRVN ...

Page 12

TFT-LCD DC-DC Converters with Operational Amplifiers Typical Operating Circuit The MAX1518 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 ...

Page 13

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 Figure 1. Typical Operating Circuit ______________________________________________________________________________________ ...

Page 14

TFT-LCD DC-DC Converters with Operational Amplifiers V IN Figure 2. MAX1518 Functional Diagram 14 ______________________________________________________________________________________ STEP-UP CONTROLLER PGND COMP AGND MAX1518 DRVP GATE-ON CONTROLLER FBP SRC DEL COM SWITCH CONTROL CTL DRN DRVN GATE-OFF CONTROLLER ...

Page 15

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 output capacitor and the load. The MOSFET ...

Page 16

TFT-LCD DC-DC Converters with Operational Amplifiers FROM CHARGE-PUMP V MAIN DRVP NPN CASCODE TRANSISTOR MAX1516 MAX1517 MAX1518 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 N) is ...

Page 17

Undervoltage Lockout (UVLO) The undervoltage-lockout (UVLO) circuit compares the input voltage at IN with the UVLO threshold (2.5V rising, 2.35V falling, typ) to ensure the input voltage is high enough for reliable operation. The 150mV (typ) hysteresis prevents supply transients ...

Page 18

TFT-LCD DC-DC Converters with Operational Amplifiers IN 5µA DEL REF CTL Figure 7. Switch-Control Block Fault Protection 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, ...

Page 19

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, transient-response time, and output voltage ripple. ...

Page 20

TFT-LCD DC-DC Converters with Operational Amplifiers 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 ...

Page 21

STEP-UP CONTROLLER PGND MAX1516 MAX1517 MAX1518 Figure 8. Operation with Output Voltages >13V Using Cascoded MOSFET The number of negative charge-pump stages is given by: − GOFF DROPOUT n = NEG V − ...

Page 22

TFT-LCD DC-DC Converters with Operational Amplifiers POSITIVE CHARGE-PUMP OUTPUT VOLTAGE vs 3-STAGE CHARGE PUMP 2-STAGE CHARGE PUMP 1-STAGE CHARGE PUMP ...

Page 23

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

Page 24

TFT-LCD DC-DC Converters with Operational Amplifiers 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 ...

Page 25

TFT-LCD DC-DC Converters with TOP VIEW SRC REF AGND PGND OUT1 NEG1 POS1 N.C. N.C. = NOT INTERNALLY CONNECTED I.C. = INTERNALLY CONNECTED TOP VIEW SRC 1 REF 2 AGND 3 PGND 4 ...

Page 26

... 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. 26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products 0. ...

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