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MAX17075

Boost Regulator with Integrated Charge Pumps,

Switch Control, and High-Current Op Amp

EVALUATION KIT AVAILABLE

19-4353; Rev 2; 12/12

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX17075 includes a high-voltage boost regulator,

one high-current operational amplifier, two regulated

charge pumps, and one MLG block for gate-driver

supply modulation.

The step-up DC-DC converter is a 1.2MHz current-

mode boost regulator with a built-in power MOSFET. It

provides fast load-transient response to pulsed loads

while producing efficiencies over 85%. The built-in

160mΩ (typ) power MOSFET allows output voltages as

high as 18V boosted from inputs ranging from 2.5V to

5.5V. A built-in 7-bit digital soft-start function controls

startup inrush currents.

The gate-on and gate-off charge pumps provide regu-

lated TFT gate-on and gate-off supplies. Both output

voltages can be adjusted with external resistive

voltage-dividers.

The operational amplifier, typically used to drive the

LCD backplane (VCOM), features high-output short-cir-

cuit current (±500mA), fast slew-rate (45V/µs), wide

bandwidth (20MHz), and rail-to-rail outputs.

The MAX17075 is available in a 24-pin thin QFN pack-

age with 0.5mm lead spacing. The package is a square

(4mm x 4mm) with a maximum thickness of 0.8mm for

ultra-thin LCD design. It operates over the -40°C to

+105°C temperature range.

Applications

Notebook Computer Displays

LCD Monitor Panels

LCD TVs

Features

♦ 2.5V to 5.5V Input Operating Range

♦ Current Mode Step-Up Regulator

Fast-Transient Response

Built-In 20V, 3A, 0.16Ω n-Channel Power MOSFET

Cycle-by-Cycle Current Limit

87% Efficiency (5V Input to 13V Output)

1.2MHz Switching Frequency

±1% Output Voltage Regulation Accuracy

♦ High-Current 18V VCOM Buffer

±500mA Output Short-Circuit Current

45V/µs Slew Rate

20MHz -3dB Bandwidth

Rail-to-Rail Output

♦ Regulated Charge Pump for TFT Gate-On Supply

♦ Regulated Charge Pump for TFT Gate-Off Supply

♦ Logic-Controlled High-Voltage Switches with

Adjustable Delay

♦ Soft-Start and Timed Delay Fault Latch for All

Outputs

♦ Overload and Thermal Protection

Ordering Information

MAX17075

AGND

VCC

BGND

DRVN

REF

FBN

POS

NEG

OUT

PGND

RSTIN

COMP

DRN

RST

COM

SRC

DRVP

FBP

SUP

CTL EP

DEL

10Ω

1µF

AVDD

TO V

COM

BGND

2.5V TO 5.5V

GON

GOFF

FROM

SYSTEM

3.3V

MAIN

FROM

TCON

Simplified Operating Circuit

PART

TEMP RANGE

PIN-PACKAGE

MAX17075ETG+

-40°C to +85°C

24 TQFN-EP*

MAX17075GTG/V+ -40°C to +105°C

24 TQFN-EP*

EP = Exposed pad.

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

/V denotes an automotive qualified part.

Pin Configuration appears at end of data sheet.

Summary of content (23 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp General Description Features The MAX17075 includes a high-voltage boost regulator, one high-current operational amplifier, two regulated charge pumps, and one MLG block for gate-driver supply modulation. The step-up DC-DC converter is a 1.2MHz currentmode boost regulator with a built-in power MOSFET.
PAGE 2
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp ABSOLUTE MAXIMUM RATINGS VCC, CTL, RSTIN, RST to AGND ..........................-0.3V to +7.5V DEL, REF, COMP, FB, FBN, FBP to AGND .......................................-0.3V to (VVCC + 0.3V) PGND, BGND to AGND.........................................-0.3V to +0.3V LX to PGND ............................................................-0.3V to +20V SUP to PGND ....................................................
PAGE 3
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp ELECTRICAL CHARACTERISTICS (continued) (VVCC = +5V, Circuit of Figure 1, VAVDD = VSUP = +13V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS LX Current Limit VFB = 1.1V, duty cycle = 75% LX On-Resistance ILX = 200mA LX Leakage Current VLX = 19V, TA = +25°C Current-Sense Transresistance Soft-Start Period MIN 2.5 0.
PAGE 4
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp ELECTRICAL CHARACTERISTICS (continued) (VVCC = +5V, Circuit of Figure 1, VAVDD = VSUP = +13V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN TYP MAX UNITS DRN-to-COM Switch On-Resistance VDEL = 1.5V, CTL = AGND 30 60 Ω COM-to-GND Pulldown VDEL = 0V 1.5 2.5 kΩ VDEL = 1.5V, CTL = VCC 300 600 VDEL = 1.
PAGE 5
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp ELECTRICAL CHARACTERISTICS (VCC = +5V, Circuit of Figure 1, VAVDD = VSUP = +13V, TA = -40°C to +105°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS VCC Input Supply Range VCC Undervoltage-Lockout Threshold VCC rising, hysteresis (typ) = 50mV MIN MAX UNITS 2.5 TYP 5.5 V 2.05 2.45 V 200 µA VCC Shutdown Current VCC Quiescent Current VFB = 1.3V, not switching 1.5 VFB = 1.
PAGE 6
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V, Circuit of Figure 1, VAVDD = VSUP = +13V, TA = -40°C to +105°C, unless otherwise noted.
PAGE 7
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 0.4 VIN = 3.3V 50 VIN = 2.5V 40 30 0.2 0.15 OUTPUT ERROR (%) 60 OUTPUT ERROR (%) 70 0.20 MAX17075 toc02 VIN = 5V 80 EFFICIENCY (%) 0.6 MAX17075 toc01 100 90 STEP-UP REGULATOR LINE REGULATION UNDER DIFFERENT LOADS STEP-UP REGULATOR OUTPUT VOLTAGE vs. LOAD CURRENT 0 -0.2 -0.4 MAX17075 toc03 STEP-UP REGULATOR EFFICIENCY vs.
PAGE 8
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) IN SUPPLY QUIESCENT CURRENT vs. IN SUPPLY VOLTAGE POWER-UP SEQUENCE OF ALL SUPPLY OUTPUTS MAX17075 toc09 SUPPLY CURRENT (mA) 3.5 MAX17075 toc08 4.0 200mA LOAD 0V AVDD 3.0 0V 2.5 0V 2.0 VCOM SRC 0V NO SWITCHING 0V 1.5 DEL GOFF GON 1.0 0.5 0V 0 3.0 3.5 4.0 5.0 4.
PAGE 9
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 10
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Pin Description PIN NAME FUNCTION 1 POS Operational Amplifier Noninverting Input 2 NEG Operational Amplifier Inverting Input 3 OUT Operational Amplifier Output 4 BGND Analog Ground for Operational Amplifier and Charge Pump. Connect to AGND underneath the IC. 5 SUP Operational Amplifier and Charge-Pump Supply Input.
PAGE 11
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp L1 3.0µH VIN 2.5V TO 5.5V (4.5 TO 5.5V FOR FULL LOAD) C2 10µF 6.3V C1 10µF 6.3V R1 10Ω C3 10µF 25V VCC C5 1µF D1 NEG VAVDD FB MAX17075 FROM SYSTEM 3.3V R10 100kΩ R9 20kΩ COMP C12 220pF R3 100kΩ VIN R13 10kΩ R11 RST RSTIN POS REF R6 13.7kΩ VAVDD 13V/500mA R8 187kΩ LX PGND OUT TO VCOM C4 10µF 25V R14 1kΩ VAVDD DRN C9 0.22µF SRC C13 0.
PAGE 12
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp VVCC LX SUP VAVDD POS BOOST CONTROLLER NEG PGND OUT FB BGND COMP SRC DEL VGON COM SWITCH CONTROL VVCC MAX17075 CTL OSC DRN VVCC VCC FROM TCON RSTIN SEQUENCE RST REF REF VAVDD AGND FBN DRVP NEGATIVE CHARGE PUMP VGOFF POSITIVE CHARGE PUMP DRVN POUT FBP SUP VAVDD Figure 2.
PAGE 13
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Table 1. Component List DESIGNATION DESCRIPTION DESIGNATION DESCRIPTION C1, C2 10µF ±20%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J106M TDK C1608X5R0J106M C11, C15, C16, C17 0.
PAGE 14
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp The error amplifier compares the feedback signal (FBP) with a 1.25V internal reference. If the feedback signal is below the reference, the charge-pump regulator turns on P1 and turns off N1 when the rising edge of the oscillator clock arrives, level shifting C15 and C17 by VSUP volts.
PAGE 15
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Negative Charge-Pump Regulator The negative charge-pump regulator is typically used to generate the negative supply rail for the TFT LCD gate driver ICs. The output voltage is set with an external resistive voltage-divider from its output to REF with the midpoint connected to FBN. The number of chargepump stages and the setting of the feedback divider determine the output of the negative charge-pump regulator.
PAGE 16
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Short-Circuit Current Limit and Input Clamp The operational amplifier limits short-circuit current to approximately ±500mA if the output is directly shorted to SUP or to BGND. If the short-circuit condition persists, the junction temperature of the IC rises until it reaches the thermal-shutdown threshold (+160°C typ).
PAGE 17
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Reference Voltage (REF) The reference voltage is nominally 1.25V, and can source at least 50µA (see the Typical Operating Characteristics). VCC is the input of the internal reference block. Bypass REF with a 0.22µF ceramic capacitor connected between REF and AGND. Power-Up Sequence and Soft-Start Once the voltage on V CC exceeds the XAO UVLO threshold of approximately 1.5V, the reference turns on. With a 0.
PAGE 18
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Thermal-Overload Protection Thermal-overload protection prevents excessive power dissipation from overheating the MAX17075. When the junction temperature exceeds +160°C, a thermal sensor immediately activates the fault protection, which shuts down all outputs except the reference, allowing the device to cool down.
PAGE 19
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp The inductor’s saturation current rating and the MAX17075’s LX current limit should exceed IAVDD_PEAK, and the inductor’s DC current rating should exceed IIN(DC,MAX). For good efficiency, choose an inductor with less than 0.1Ω series resistance. Considering the typical operating circuit, the maximum load current (IAVDD(MAX)) is 500mA with a 13V output and a typical input voltage of 5V. Choosing an LIR of 0.
PAGE 20
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp To further optimize transient response, vary RCOMP in 20% steps and CCOMP in 50% steps while observing transient-response waveforms. Charge-Pump Regulators Selecting the Number of Charge-Pump Stages For highest efficiency, always choose the lowest number of charge-pump stages that meet the output requirement.
PAGE 21
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp PCB Layout and Grounding the operational amplifier divider ground connections, the COMP and DEL capacitor ground connections, and the device’s exposed backside pad. Connect the AGND and PGND islands by connecting the PGND pin directly to the exposed backside pad. Make no other connections between these separate ground planes. Careful PCB layout is important for proper operation.
PAGE 22
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Pin Configuration Chip Information FB COMP RSTIN AGND VCC TOP VIEW PGND PROCESS: S45UR 18 17 16 15 14 13 12 PGND 19 11 FBN 10 FBP COM 22 9 RST SRC 23 8 CTL DEL 24 7 DRVN LX 20 DRN 21 4 5 6 BGND SUP DRVP NEG 3 OUT 2 POS MAX17075 1 Package Information REF For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages.
PAGE 23
MAX17075 Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp Revision History REVISION NUMBER REVISION DATE 0 11/08 1 5/12 Initial release Updated Absolute Maximum Ratings 2 12/12 Added MAX17075GTG/V+ to Ordering Info and corrected typos DESCRIPTION PAGES CHANGED — 2 1, 2, 4–6 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.