Datasheet

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General Description

The MAX17113 multiple-output power-supply controller

generates all the supply rails for thin-film transistor

(TFT) liquid-crystal display (LCD) panels in TVs and

monitors operating from a regulated 12V input. It

includes a step-down and a step-up regulator, a posi-

tive and a negative charge pump, a Dual Mode™ logic-

controlled high-voltage switch control block, and an

adjustable-timing power-good output. The MAX17113

can operate from 8V to 16.5V input voltages and is opti-

mized for LCD TV panel and LCD monitor applications

running directly from 12V supplies.

The step-up and step-down regulators feature internal

power MOSFETs and high-frequency operation allow-

ing the use of small inductors and capacitors, resulting

in a compact solution. Both switching regulators use

fixed-frequency current-mode control architectures,

providing fast load-transient response and easy com-

pensation. A current-limit function for internal switches

and output-fault shutdown protect the step-up and

step-down power supplies against fault conditions. The

MAX17113 provides soft-start functions to limit inrush

current during startup. The MAX17113 provides

adjustable power-up timing.

The positive and negative charge-pump regulators pro-

vide TFT gate-driver supply voltages. Both output volt-

ages can be adjusted with external resistive voltage-

dividers. The switch control block allows the manipula-

tion of the positive TFT gate-driver voltage.

A series p-channel MOSFET is integrated to sequence

power to AV

after the MAX17113 has proceeded

through normal startup, and provides True Shutdown™.

The MAX17113 is available in a small (5mm x 5mm),

low-profile (0.8mm), 40-pin thin QFN package and

operates over a -40°C to +85°C temperature range.

Applications

LCD TV Panels

LCD Monitor Panels

Features

o Optimized for 10.8V to 13.2V Input Supply

o 8V to 16.5V Input Supply Range

o Selectable Frequency (450kHz/600kHz)

o Current-Mode Step-Up Regulator

Built-In 24V, 3.3A, 80mΩ n-Channel MOSFET

High-Accuracy Output Voltage (1%)

True Shutdown

Fast Load-Transient Response

High Efficiency

10ms Internal Soft-Start

o Current-Mode Step-Down Regulator

Built-In 24V, 3A, 100mΩ n-Channel MOSFET

Fast Load-Transient Response

Adjustable Output Voltage Down to 1.5V

Skip Mode at Light Load (EN2 = AGND)

High Efficiency

3ms Internal Soft-Start

o Adjustable Positive and Negative Charge-Pump

Regulators

o Soft-Start and Timer-Delay Fault Latch for All

Outputs

o Logic-Controlled High-Voltage Integrated

Switches with Adjustable Delay

o 120mΩ p-Channel FET for AV

Sequencing

o Input Undervoltage Lockout and Thermal-

Overload Protection

o 40-Pin, 5mm x 5mm Thin QFN Package

MAX17113

Low-Cost, Multiple-Output

Power Supply for LCD TVs

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4709; Rev 0; 8/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX17113ETL+ -40°C to +85°C

40 Thin QFN-EP*

Dual Mode is a trademark of Maxim Integrated Products, Inc.

True Shutdown is a trademark of Maxim Integrated Products, Inc.

Simplified Operating Circuit appears at end of data sheet.

MAX17113

THIN QFN

5mm x 5mm

TOP VIEW

DRVP

SRC

GON

DRN

MODE

THR

DEL2

FSEL

VIN

EN2

PGND

IN2

SWI

4567

27282930 26 24 23 22

SWO

FB1

BST

FB2

DEL1

REF

GND2

EN1

COMP

FBN

PGOOD

CRST

AGND

DRVN

CTL

LX1

LX2

LX1

LX2

DLP

FBP

CPGND

OUT

8910

PGND

Pin Configuration

Summary of content (30 pages)

PAGE 1
9-4709; Rev 0; 8/09 KIT ATION EVALU E L B A IL AVA Low-Cost, Multiple-Output Power Supply for LCD TVs Features Applications LCD TV Panels OUT IN2 IN2 VIN FSEL TOP VIEW DEL2 Pin Configuration EN1 o 30 29 28 27 26 25 24 23 22 21 PGND 31 20 LX2 LX1 32 19 LX2 LX1 33 18 BST SWI 34 17 FB2 16 DEL1 3 Simplified Operating Circuit appears at end of data sheet. Dual Mode is a trademark of Maxim Integrated Products, Inc. True Shutdown is a trademark of Maxim Integrated Products, Inc.
PAGE 2
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs ABSOLUTE MAXIMUM RATINGS VIN, IN2, EN1, EN2, FSEL to AGND.......................-0.3V to +24V CPGND, GND2, PGND to AGND ........................................±0.3V MODE, DLP, CTL, THR, DEL1, DEL2, VL, PGOOD to AGND .............................................-0.3V to +7.5V REF, FBP, FBN, FB1, FB2, COMP, OUT, CRST to AGND .......................................-0.3V to (VVL + 0.3V) LX1, SWI, SWO to AGND .......................................-0.
PAGE 3
Low-Cost, Multiple-Output Power Supply for LCD TVs MAX17113 ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VVIN = VIN2 = 12V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS 1.235 1.250 1.265 V 10 mV REFERENCE REF Output Voltage No external load REF Load Regulation 0 < ILOAD < 50μA REF Sink Current In regulation REF Undervoltage-Lockout Threshold Rising edge; 25mV typical hysteresis 10 μA 1.0 1.
PAGE 4
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VVIN = VIN2 = 12V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS 18 V 70 100 ns 1.250 1.2625 STEP-UP REGULATOR Output-Voltage Range VVIN Minimum tON TA = +25°C FB1 Regulation Voltage FB1 = COMP, CCOMP = 1mF FB1 Fault Threshold FB rising, hysteresis = 12mV 0°C < TA < +85°C FB1 UVLO Threshold 1.
PAGE 5
Low-Cost, Multiple-Output Power Supply for LCD TVs (Circuit of Figure 1, VVIN = VIN2 = 12V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS Negative Charge-Pump Soft-Start Period 2 ms Negative Charge-Pump Soft-Start Step Size (VREF VFBN/128 V AVDD SWITCH SWI Supply Range 8.0 SWI Overvoltage Fault Threshold SWI rising edge, 300mV typical hysteresis (Note 2) 18.50 SWI-SWO Switch Resistance 18.5 V 19.2 19.
PAGE 6
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VVIN = VIN2 = 12V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.
PAGE 7
Low-Cost, Multiple-Output Power Supply for LCD TVs MAX17113 ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VVIN = VIN2 = 12V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 3) PARAMETER CONDITIONS MIN MAX UNITS 200 mΩ 25 Ω 7 25 Ω 2.50 3.50 A 65 90 % 0.94 1.06 V 0.3 V 0.8 1.2 μA 1.2 1.
PAGE 8
ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VVIN = VIN2 = 12V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 3) PARAMETER CONDITIONS MODE Voltage Threshold for Enabling DRN Switch Control in Mode 2 GON connects to DRN MODE Current-Source Stop Voltage Threshold MODE rising MIN THR-to-GON Voltage Gain TYP MAX UNITS 1.15 1.35 V 2 3 V 9.4 10.6 V/V 0.6 V SEQUENCE CONTROL EN1, EN2 Input Low Voltage EN1, EN2 Input High Voltage 1.
PAGE 9
Low-Cost, Multiple-Output Power Supply for LCD TVs STEP-UP REGULATOR EFFICIENCY vs. LOAD CURRENT STEP-DOWN REGULATOR SOFT-START (HEAVY LOAD) MAX17113 toc04 MAX17113 toc05 100 VIN 5V/div 95 0V 0V VOUT 2V/div INDUCTOR CURRENT 500mA/div 0A 3.3V 0V EFFICIENCY (%) 90 85 80 75 70 65 60 VLX2 10V/div 55 50 0.01 2ms/div 0.1 10 1 LOAD CURRENT (A) STEP-UP REGULATOR OUTPUT VOLTAGE vs. LOAD CURRENT MAX17113 toc07 MAX17113 toc06 0.
PAGE 10
Typical Operating Characteristics (continued) (Circuit of Figure 1. VIN = VINL = VSUPP = 12V, AVDD = 16V, VGON = 34.5V, VGOFF = -6V, VOUT1 = 3.3V, TA = +25°C, unless otherwise noted.) STEP-UP REGULATOR CURRENT LIMIT vs. INPUT VOLTAGE L1 = 10FH STEP-UP REGULATOR CURRENT LIMIT (A) TIME-DELAY LATCH RESPONSE TO OVERLOAD MAX17113 toc11 MAX17113 toc10 4.0 0V VAVDD 10V/div 3.5 VGON 50V/div 0V VGOFF 50V/div 3.0 0A 8 9 10 11 12 13 14 200ms/div INPUT VOLTAGE (V) SWITCHING FREQUENCY vs.
PAGE 11
Low-Cost, Multiple-Output Power Supply for LCD TVs POSITIVE CHARGE-PUMP REGULATOR LOAD-TRANSIENT RESPONSE POSITIVE CHARGE-PUMP REGULATOR NORMALIZED LOAD REGULATION MAX17113 toc17 MAX17113 toc16 0.8 OUTPUT-VOLTAGE ERROR (%) 0.4 VSRC 500mV/div 34.8V 0 -0.4 70mA -0.8 -1.2 LOAD CURRENT 20mA/div -1.6 10mA -2.0 0 25 50 75 100 125 150 100Fs/div LOAD CURRENT (mA) NEGATIVE CHARGE-PUMP REGULATOR NORMALIZED LINE REGULATION 0.2 OUTPUT-VOLTAGE ERROR (%) 0.05 MAX17113 toc19 0.
PAGE 12
Typical Operating Characteristics (continued) (Circuit of Figure 1. VIN = VINL = VSUPP = 12V, AVDD = 16V, VGON = 34.5V, VGOFF = -6V, VOUT1 = 3.3V, TA = +25°C, unless otherwise noted.) POWER-GOOD FUNCTION VIN SUPPLY CURRENT vs.
PAGE 13
Low-Cost, Multiple-Output Power Supply for LCD TVs PIN 1 NAME THR FUNCTION GON Low-Level Regulation Set-Point Input. Connects THR to the center of a resistive voltage-divider between AVDD and GND to set the VGON falling regulation level. The actual level is 10 × VTHR. See the High-Voltage Switch Control section for details. 2 DRVP Positive Charge-Pump Driver Output. Connects DRVP to the positive charge-pump flying capacitor(s). 3 GND2 Internal Buck LSS Power Ground 4 SRC Switch Input.
PAGE 14
Low-Cost, Multiple-Output Power Supply for LCD TVs MAX17113 Pin Description (continued) PIN NAME FUNCTION 25 FSEL Frequency Select Pin. Connect FSEL to AGND for 450kHz operation. Connect to VL or VIN for 600kHz operation. 26 EN1 Step-Down and Negative Charge-Pump Regulator Enable Input. Input high also enables DLY1 pullup current. DEL2 Step-Up Regulator and Positive Charge-Pump Delay Input.
PAGE 15
Low-Cost, Multiple-Output Power Supply for LCD TVs VIN 12V C2 10μF 22 10μF C3 10μF 23 30 32 31 PGND PGND IN2 IN2 18 OUT 3.3V 2A MAX17113 L1 4.7μH LX1 D1 33 LX1 SWI BST 34 C24 10μF 0.1μF AVDD 16V 1.5A 19 L2 2.4μH C5 22μF LX2 20 LX2 D2 3 21 17 SWO 35 C15, C16 2x 10μF GND2 FB1 36 37 COMP OUT FB2 13.3kΩ 100kΩ 24 VIN AGND VIN 0.1μF THR 28 VL 25 FSEL 7 MODE 15 REF VL 1μF REF 0.22μF 158kΩ CTL DRN 330pF 40 33.
PAGE 16
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs Typical Operating Circuit Detailed Description The typical operating circuit (Figure 1) of the MAX17113 is a complete power-supply system for TFT LCD panels in monitors and TVs. The circuit generates a +3.3V logic supply, a +16V source driver supply, a +34.5V positive gate driver supply, and a -6V negative gate driver supply from a 12V ±10% input supply.
PAGE 17
Low-Cost, Multiple-Output Power Supply for LCD TVs MAX17113 VIN (12V) BST VL IN2 3.3V 2A MAX17113 LX2 STEP-DOWN OSC LX1 STEP-UP PGND GND2 FB1 COMP OUT AGND FSEL VL SWI P 150mV VIN VL REF 3.3V VIN VL VL PGOOD RESET REF REF DRN EN1 THR EN2 MODE DEL1 HV SWITCH BLOCK POWER-UP SEQUENCE DEL2 CTL DLP GON 50% OSC SRC VIN VGOFF -6V 100mA PGOOD CRST AGND STEP-DOWN, NEGATIVE ON/OFF STEP-UP, POSITIVE CHARGE PUMP ON/OFF AVDD 16V 1.
PAGE 18
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs PWM Controller Block The heart of the PWM control block is a multi-input, open-loop comparator that sums three signals: the output-voltage signal with respect to the reference voltage, the current-sense signal, and the slope compensation. The PWM controller is a direct-summing type, lacking a traditional error amplifier and the phase shift associated with it.
PAGE 19
Low-Cost, Multiple-Output Power Supply for LCD TVs Step-Up Regulator Internal p-Channel MOSFET Pass Switch The MAX17113 includes an integrated 130mΩ highvoltage p-channel MOSFET to allow true shutdown of the step-up converter output (AVDD). This switch is typically connected in series between the step-up regulator’s Schottky catch diode and its output capacitors.
PAGE 20
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs The positive charge-pump regulator’s startup can be delayed by connecting an external capacitor from DEL2 to AGND. An internal constant-current source begins charging the DEL2 capacitor when EN2 is logichigh, and the step-down regulator reaches regulation. When the DEL2 voltage exceeds V REF, the positive charge-pump regulator is enabled.
PAGE 21
Low-Cost, Multiple-Output Power Supply for LCD TVs Select the first mode by connecting MODE to VL. When CTL is logic-high, Q1 turns on and Q2 turns off, connecting GON to SRC. When CTL is logic-low, Q1 turns off and Q2 turns on, connecting GON to DRN. GON can then be discharged through a resistor connected between DRN and GND or AV DD . Q2 turns off and stops discharging GON when VGON reaches 10 times the voltage on THR.
PAGE 22
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs When VMODE is less than 0.8 x VVL, the switch control block works in the second mode. The rising edge of VCTL turns on Q1 and turns off Q2, connecting GON to SRC. An internal n-channel MOSFET, Q3, between MODE and AGND is also turned on to discharge an external capacitor between MODE and AGND. The falling edge of VCTL turns off Q3, and an internal 50μA current source starts charging the MODE capacitor.
PAGE 23
Low-Cost, Multiple-Output Power Supply for LCD TVs MAX17113 VIN VIN UVLO EN1 VL/REF tSS BUCK OUTPUT SWO TURNS ON AND DEL2 CHARGES WHEN EN2 IS HIGH AND BUCK SS IS DONE. EN2 TIME NEGATIVE CHARGE-PUMP REGULATOR OUTPUT tSS DEL1 DEL2 REF REF TIME POSITIVE CHARGE-PUMP REGULATOR OUTPUT BOOST SWITCHING AVDD SWO TURN-ON VIN SUI (INTERNAL SIGNAL) tSS(BOOST) TIME tSS DLP REF TIME GON GON DEPENDS ON CTL GON CONNECTED TO GROUND TIME DLP ABOVE REF. START HIGH-VOLTAGE SWITCH BLOCK. DEL2 ABOVE REF.
PAGE 24
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs Thermal-Overload Protection The thermal-overload protection prevents excessive power dissipation from overheating the MAX17113. When the junction temperature exceeds TJ = +160°C, a thermal sensor immediately activates the fault protection that shuts down all the outputs except the reference and latches off, allowing the device to cool down.
PAGE 25
Low-Cost, Multiple-Output Power Supply for LCD TVs VOUT _ RIPPLE = VOUT _ RIPPLE(ESR) + VOUT _ RIPPLE(C) VOUT _ RIPPLE(ESR) = IOUT _ RIPPLE × RESR _ OUT VOUT _ RIPPLE(C) = IOUT _ RIPPLE 8 × COUT × fSW where IOUT_RIPPLE is defined in the Inductor Selection of the Step-Down Regulator section, COUT is the output capacitance, and RESR_OUT is the ESR of the output capacitor COUT. In Figure 1’s circuit, the inductor ripple current is 0.8A.
PAGE 26
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs characteristics of the inductor core material and ratio of inductor resistance to other power path resistances, the best LIR can shift up or down. If the inductor resistance is relatively high, more ripple can be accepted to reduce the number of turns required and increase the wire diameter. If the inductor resistance is relatively low, increasing inductance to lower the peak current can decrease losses throughout the power path.
PAGE 27
Low-Cost, Multiple-Output Power Supply for LCD TVs Rectifier Diode The MAX17113’s high switching frequency demands a high-speed rectifier. Schottky diodes are recommended for most applications because of their fast recovery time and low forward voltage. In general, a 2A Schottky diode complements the internal MOSFET well.
PAGE 28
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs where COUT_CP is the output capacitor of the charge pump, I LOAD _ CP is the load current of the charge pump, and VRIPPLE_CP is the peak-to-peak value of the output ripple. input capacitor ground terminals. Connect these loop components with short, wide connections. Avoid using vias in the high-current paths. If vias are unavoidable, use many vias in parallel to reduce resistance and inductance.
PAGE 29
Low-Cost, Multiple-Output Power Supply for LCD TVs VIN IN2 IN2 PGND PGND BST LX1 LX1 SWI SW AVDD OUT SWO LX2 LX2 GND2 FB1 COMP VIN OUT FB2 AGND VIN THR FROM GON CONTROL CTL VL DRN VL FSEL REF GON GON MODE 3.
PAGE 30
MAX17113 Low-Cost, Multiple-Output Power Supply for LCD TVs Package Information Chip Information PROCESS: BiCMOS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 40 TQFN-EP T4055+1 21-0140 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.