Rainbow Electronics MAX8728 User Manual

General Description

The MAX8728 generates all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in TVs and monitors. It includes step-down and step-up regulators, positive and negative charge pumps, and a dualmode, logic-controlled high-voltage switch control block. The MAX8728 can operate from input voltages from 7V to

13.2V and is optimized 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 allowing 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 compensation. The positive and negative charge-pump regulators provide TFT gate-driver supply voltages. Both output voltages can be adjusted with external resistive voltage-dividers.

The MAX8728 is available in a small (5mm x 5mm), lowprofile (0.8mm), 32-pin TQFN package and operates over the -40°C to +85°C temperature range.

Applications

LCD Monitors LCD TVs

Features

♦ Optimized for 10.8V to 13.2V Input Supply ♦ 7V to 13.2V Input Supply Range ♦ Selectable Frequency (500kHz/1MHz/1.5MHz) ♦ Current-Mode Step-Down Regulator

14V Internal n-Channel MOSFET

1.5% Accurate Output

♦ Current-Mode Step-Up Regulator

19V Internal n-Channel MOSFET 1% Accurate Output True Shutdown™ (Output Goes to Zero)

♦ 180° Out-of-Phase Switching ♦ Adjustable Positive/Negative Charge Pumps ♦ Soft-Start and Timer Delay Fault Latch for All

Outputs

♦ Logic-Controlled, High-Voltage Switches ♦ Power-Up and Power-Down Sequences ♦ Thermal-Overload Protection

MAX8728

Low-Cost, Multiple-Output

Power Supply for LCD Monitors/TVs

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX8728

GON

GATEINL

OUT1

GOFF

LX1

ON/OFF

OUT1

FBI FSEL

GND1

GND

FBP

SRC

REF

GON

DRN

MODE

THR

COMP

SHDN

LCD ENABLE

FROM T

CON

CTL

DEL

FB2

LX2

GND2

FBN DRVN

SUPP

DRVP

BST IN

Simplified Operating Circuit

19-3910; Rev 0; 1/06

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.

PART

TEMP RANGE

PINPACKAGE

PACKAGE

CODE

MAX8728ETJ+

32 TQFN-EP* 5mm x 5mm

T3255-4

Pin Configuration

MAX8728

TQFN

TOP VIEW

OUT1

CTL

LX1

BST

GND1

FB2

DRN

GON

FBN

SRC

FSEL

12EN4567

2324 22 20 19 18

MODE

DEL

FBP

REF

GND

SHDN

DRVN

THR

COMP

FB1

GATE

GNDP

LX2

DRVP

INL

SUPP

GND2

+Denotes lead-free package. *EP = Exposed pad.

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

-40°C to +85°C

MAX8728

Low-Cost, Multiple-Output Power Supply for LCD Monitors/TVs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VIN= V

INL

= V

SUPP

= 12V, V

OUT1

= +3.3V, V

SRC

= 28V, GND1 = GND2 = GNDP = GND = 0, I

REF

= 0, TA= 0°C

to +85°C. Typical values are at T

= +25°C, unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

IN, INL, SUPP to GND ............................................-0.3V to +14V

SUPP to IN ..........................................................................±0.3V

DRVP to GNDP.........................................-0.3V to V

SUPP

+ 0.3V

CTL, EN,

SHDN, OUT1, VL, VCCto GND ................-0.3V to +6V

COMP, FB1, FB2, FBN, FBP, FSEL, DEL,

THR, MODE, REF to GND ........................-0.3V to V

+ 0.3V

GND1, GND2, GNDP to GND.............................................±0.3V

BST to GND1 ..........................................................-0.3V to +20V

LX1 to BST................................................................-6V to +0.3V

LX2 to GND2 ..........................................................-0.3V to +19V

DRVN, LX1, GATE to GND1 ..........................-0.3V to V

+ 0.3V

GON, SRC to GND .................................................-0.3V to +40V

SRC to GON ...........................................................-0.3V to +40V

SRC to SUPP ..........................................................-0.3V to +30V

SRC to SUPP (momentary)......................................-14V to +30V

GON to SUPP ..........................................................-14V to +30V

SRC to DRN............................................................-0.3V to +40V

DRN to GND ...........................................................-0.3V to +40V

GON to DRN...........................................................-0.3V to +30V

Short Circuit to GND..............................................Momentary

REF Short Circuit to GND ...........................................Continuous

DRVN RMS Current..........................................................-400mA

DRVP RMS Current.........................................................+100mA

LX2 RMS Current ................................................................+1.6A

GND2 RMS Current ............................................................+1.6A

LX1 RMS Current .................................................................-1.6A

Continuous Power Dissipation (T

= +70°C)

32-Pin Thin QFN (derate 34.5mW/°C above +70°C) .....2758mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

GENERAL

IN, INL Input Voltage Range For VL regulator operation 7.0 12.0 13.2 V

INL Quiescent Current

FB2

= V

FBP

= 2.2V, V

FBN

= 0,

LX2 not switching, LX1 switching

7mA

IN Standby Supply Current VIN = 7V to 13.2V, EN = SHDN = GND 0.5 mA

FSEL = GND 1275 1500 1730

FSEL = V

850 1000 1150Switching Frequency

FSEL = REF 425 530 610

kHz

Phase Difference Between Step-Down/Positive and Step-Up/Negative Regulators

180

Degrees

VL REGULATOR

VL Output Voltage

7V < V

INL

< 13.2V, V

FB1

= V

FB2

= V

FBP

1.9V, V

FBN

= 0.5V, IVL = 25mA

4.8 5.0 5.1 V

VL Undervoltage Lockout Threshold

VL rising, 2.5% hysteresis 3.8 4.0 4.1 V

REFERENCE

REF Output Voltage No external load 1.98 2.00 2.02 V

REF Load Regulation 0 < I

REF

< 50µA 10 mV

REF Sink Current REF in regulation 0 10 µA

REF Undervoltage Lockout Threshold

Rising edge, 200mV hysteresis 1.5 V

MAX8728

Low-Cost, Multiple-Output

Power Supply for LCD Monitors/TVs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= V

INL

= V

SUPP

= 12V, V

OUT1

= +3.3V, V

SRC

= 28V, GND1 = GND2 = GNDP = GND = 0, I

REF

= 0, TA= 0°C

to +85°C. Typical values are at T

= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

STEP-DOWN REGULATOR

OUT1 Voltage in Fixed Mode

= 7.0V to 13.2V, EN = VCC,

LOAD

= 0.5A (Note 1)

3.25 3.30 3.35 V

FB1 Regulation Voltage in Adjustable Modes

20% to 35% duty cycle, EN = VCC, I

LOAD

= 0.5A (Note 1)

1.97 2.00 2.03 V

FB1 Adjustable Mode Threshold Voltage

0.10 0.15 0.20 V

Output Voltage Adjust Range 2.0 3.6 V

Fixed mode, OUT1 falling 2.640

Step-Down Regulator Fault Trip Level

Adjustable mode, FB1 falling 1.536 1.600 1.664

FB1 Input Leakage Current V

FB1

= 2.1V -100 +100 nA

Low-Frequency Operation OUT1 Threshold

LX1 only 1.3 V

FSEL = GND 250

FSEL = V

167

Low-Frequency Operation Switching Frequency

LX1 only

FSEL = REF 83

kHz

DC Load Regulation 0 < I

OUT1

< 2A, EN = V

0.5 %

DC Line Regulation 7V <V

< 13.2V, EN = V

0.1 %/V

LX1-to-IN Switch On-Resistance

200 300 mΩ

LX1-to-GND1 Switch On-Resistance

10 22 40 Ω

Positive Current Limit 2.5 2.8 3.1 A

Skip Mode I

MAX

Threshold EN = GND 0.50 0.60 0.75 A

Soft-Start Ramp Time 1.7 ms

Maximum Duty Cycle 70 77 85 %

STEP-UP REGULATOR

Output Voltage Range V

17 V

Maximum Duty Cycle 65 75 85 %

Minimum On-Time 65 100 ns

FB2 Regulation Voltage FB2 = COMP, C

COMP

= 1nF 1.98 2.00 2.02 V

FB2 Fault Trip Level Falling edge 1.728 1.800 1.872 V

FB2 Load Regulation 0 < I

AVDD

< full, transient only -1 %

FB2 Line Regulation V

= 10.8V to 13.2V 0.08 0.15 %/V

FB2 Input Bias Current V

FB2

= 2V -150 +150 nA

FB2 Transconductance ΔI = ±2.5µA at COMP, FB2 = COMP 75 160 280 µS

FB2 Voltage Gain FB2 to COMP 700 V/V

LX2 Leakage Current V

FB2

= 2.1V, V

LX2

= 13V 4 40 µA

LX2 Current Limit V

FB2

= 1.8V, duty cycle is 25% 1.2 1.5 1.8 A

MAX8728

Low-Cost, Multiple-Output Power Supply for LCD Monitors/TVs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= V

INL

= V

SUPP

= 12V, V

OUT1

= +3.3V, V

SRC

= 28V, GND1 = GND2 = GNDP = GND = 0, I

REF

= 0, TA= 0°C

to +85°C. Typical values are at T

= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX

UNITS

Current-Sense Transresistance

0.6 1.2 1.8 V/A

LX2 On-Resistance 0.5 1.0 Ω

Soft-Start Period 3ms

POSITIVE CHARGE-PUMP REGULATOR

FBP Regulation Voltage 1.98 2.00 2.02 V

FBP Line Regulation Error VIN = V

SUPP

= 10.8V to 13.2V 6 mV

FBP Input Bias Current V

FBP

= 2.1V -50 +50 nA

DRVP p-Channel MOSFET On-Resistance

4 Ω

DRVP n-Channel MOSFET On-Resistance

1 Ω

FBP Fault Trip Level Falling edge 1.536

1.664 V

Positive Charge-Pump Soft-Start

Period

3ms

NEGATIVE CHARGE-PUMP REGULATOR

FBN Regulation Voltage V

REF

- V

FBN

1.727

1.773 V

FBN Input Bias Current V

FBN

= 250mV -50 +50 nA

FBN Line Regulation V

= 10.8V to 13.2V 6 mV

DRVN p-Channel MOSFET On-Resistance

4 Ω

DRVN n-Channel MOSFET

On-Resistance

1 Ω

FBN Fault Trip Level Rising edge 600 mV

Negative Charge-Pump

Soft-Start Period

3ms

SEQUENCE CONTROL

SHDN Input Low Voltage 0.4 V SHDN Input High Voltage 2 V SHDN Input Current 1µA

EN Charge Current During startup, VEN = 1.0V 456µA

EN Turn-On Threshold 0.95 1.00 1.05 V

DEL Capacitor Charge Current During startup, V

DEL

= 1.0V 456µA

DEL Turn-On Threshold 0.95 1.00 1.05 V

GATE Output Sink Current EN = high, GATE = IN 8 11 14 µA

GATE On Voltage EN = high V

- 6

- 4 V

GATE Done Threshold EN = high, V

GATE_DONE

- V

GATE_ ON

01 V

GATE Pullup Resistance EN = low, V

GATE

= V

- 5V 1 kΩ

1.600

1.750

- 5

MAX8728

Low-Cost, Multiple-Output

Power Supply for LCD Monitors/TVs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= V

INL

= V

SUPP

= 12V, V

OUT1

= +3.3V, V

SRC

= 28V, GND1 = GND2 = GNDP = GND = 0, I

REF

= 0, TA= 0°C

to +85°C. Typical values are at T

= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX

UNITS

DEL, EN Discharge Switch On-Resistance

SHDN = low or fault tripped 20 Ω

FBN Discharge Switch On-Resistance

EN = low or fault tripped 5 kΩ

POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES

CTL Input Low Voltage 0.6 V

CTL Input High Voltage 2.0 V

CTL Input Leakage Current -1 +1 µA

CTL-to-GON Rising Propagation Delay

1kΩ from DRN to GND, 1.5nF from GON to GND

100 ns

CTL-to-GON Falling Propagation Delay

1kΩ from DRN to GND, 1.5nF from GON to GND

250 ns

SRC Input Voltage Range 38 V

MODE

= V

REF

, V

DEL

= V

CTL

= 3V 1.5 2.0

SRC Input Current

MODE

= V

REF

, V

DEL

= 3V, V

CTL

= 0 0.14 0.20

DRN Input Current

MODE

= V

REF

, V

DRN

= 8V, V

DEL

= 3V,

GON

> V

DRN

, V

CTL

= 0

01µA

SRC Switch On-Resistance V

MODE

= V

REF

, V

DEL

= V

CTL

= 3V 15 30 Ω

SRC Switch Saturation Current

MODE

= V

REF

, V

DEL

= V

CTL

= 3V,

SRC

- V

GON

> 5V

260 mA

DRN Switch On-Resistance

MODE

= V

REF

, V

DEL

= 3V, V

CTL

= 0, V

GON

= 28V, V

THR

= 1.4V

25 50 Ω

DRN Switch Saturation Current

MODE

= V

REF

, V

DEL

= 3V, V

CTL

= 0, V

GON

= 28V, V

THR

= 1.4V, V

GON

- V

DRN

> 5V

100 mA

MODE Switch On-Resistance SHDN = GND 1 kΩ

MODE Current-Source Stop Voltage Threshold

MODE rising 1.2 1.4 1.6 V

MODE Charge Current Operating mode 2, V

MODE

= 0.7V 40 50 60 µA

MODE Voltage Threshold Enabling DRN switch control in mode 2 0.8 1.0 1.2 V

THR to GON Voltage Gain 9.4 10.0 10.6 V/V

FAULT DETECTION

Duration to Trigger Fault 50 ms

Thermal Shutdown Threshold 15°C typical hysteresis +160 °C

SWITCHING-FREQUENCY SELECTION

FSEL = VCC (1MHz)

FSEL = REF (0.5MHz) 1.65 2.35FSEL Input Levels

FSEL = GND (1.5MHz) 0.5

FSEL Input Current Forced to V

10 µA

VCC - 0.4

MAX8728

Low-Cost, Multiple-Output Power Supply for LCD Monitors/TVs

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VIN= V

INL

= V

SUPP

= 12V, V

OUT1

= +3.3V, V

SRC

= 28V, GND1 = GND2 = GNDP = GND = 0, I

REF

= 0, TA=

-40°C to +85°C.) (Note 2)

PARAMETER CONDITIONS MIN TYP MAX

GENERAL

IN, INL Input Voltage Range For VL regulator operation 7.0 13.2 V

IN Standby Supply Current VIN = 7V to 13.2V, EN = SHDN = GND 0.5 mA

FSEL = GND 1175 1800

FSEL = V

780 1150Switching Frequency

FSEL = REF 400 610

kHz

VL REGULATOR

VL Output Voltage

7V < V

INL

< 13.2V, V

FB1

= V

FB2

= V

FBP

= 1.9V,

FBN

= 0.5V, IVL = 25mA

4.8 5.1 V

VL Undervoltage Lockout Threshold

VL rising, 2.5% hysteresis 3.8 4.1 V

REFERENCE

REF Output Voltage No external load 1.97 2.02 V

REF Load Regulation 0 < I

RFI

< 50µA 10 mV

STEP-DOWN REGULATOR

OUT1 Voltage in Fixed Mode

= 6.0V to 13.2V, EN = VCC,

LOAD

= 0.5A (Note 1)

3.23 3.35 V

FB1 Regulation Voltage in Adjustable Mode

20% to 35% duty cycle, EN = VCC, I

OUT1

= 0.5A (Note 1)

1.97 2.03 V

FB1 Adjustable-Mode Threshold Voltage

0.10 0.20 V

Output Voltage Adjust Range 2.0 3.6 V

Step-Down Regulator Fault Trip Level

Adjustable mode, FB1 falling

1.664 V

LX1-to-IN Switch On-Resistance

550 mΩ

LX1-to-GND1 Switch On-Resistance

840Ω

Positive Current Limit 2.3 3.1 A

Skip Mode I

MAX

Threshold EN = GND 0.45 0.75 A

Maximum Duty Cycle 70 85 %

STEP-UP REGULATOR

Output Voltage Range V

17 V

Maximum Duty Cycle 65 85 %

FB2 Regulation Voltage FB2 = COMP, C

COMP

= 1nF 1.97 2.02 V

LX2 Current Limit V

FB2

= 1.8V, duty cycle is 25% 1.2 1.8 A

LX2 On-Resistance 1 Ω

1.536

UNITS

MAX8728

Low-Cost, Multiple-Output

Power Supply for LCD Monitors/TVs

_______________________________________________________________________________________ 7

Note 1: When the inductor is in continuous conduction (EN = VCCor heavy load), the output voltage has a DC regulation level lower

than the error comparator threshold by 50% of the output voltage ripple. In discontinuous conduction (EN = GND with light load), the output voltage has a DC regulation level higher than the error comparator threshold by up to 50% of the output voltage ripple.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= V

INL

= V

SUPP

= 12V, V

OUT1

= +3.3V, V

SRC

= 28V, GND1 = GND2 = GNDP = GND = 0, I

REF

= 0, TA=

-40°C to +85°C.) (Note 2)

PARAMETER CONDITIONS MIN TYP MAX

UNITS

CHARGE-PUMP REGULATORS

FBP Regulation Voltage 1.97 2.02 V

FBN Regulation Voltage V

REF

- V

FBN

1.71 1.78 V

SEQUENCE CONTROL

SHDN Input Low Voltage 0.4 V SHDN Input High Voltage 2 V

EN Turn-On Threshold 0.95 1.10 V DEL Turn-On Threshold 0.95 1.10 V

GATE On Voltage EN = high

- 4 V

GATE Done Threshold EN = high, V

GATE_DONE

- V

GATE_ON

POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES

CTL Input Low Voltage 0.6 V

CTL Input High Voltage 2.1 V

SRC Input Voltage Range 38 V

MODE

= V

REF

, V

DEL

= V

CTL

= 3V 2.3

SRC Input Current

MODE

= V

REF

, V

DEL

= 3V, V

CTL

= 0 0.2

SRC Switch On-Resistance V

MODE

= V

REF

, V

DEL

= V

CTL

= 3V 30 Ω

DRN Switch On-Resistance

MODE

= V

REF

, V

DEL

= 3V, V

CTL

= 0,

GON

= 28V, V

THR

= 1.4V

50 Ω

MODE Current-Source StopVoltage Threshold

MODE rising 1.2 1.6 V

MODE Voltage Threshold Enabling DRN switch control in mode 2 0.8 1.2 V

THR-to-GON Voltage Gain 9.4 10.6 V/V

- 6

MAX8728

Low-Cost, Multiple-Output Power Supply for LCD Monitors/TVs

8 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1. VIN= V

INL

= V

SUPP

= 12V, AVDD= 13.5V, V

GON

= 28V, V

GOFF

= -6V, V

OUT1

= 3.3V, FSEL = GND, TA= +25°C,

unless otherwise noted.)

STEP-DOWN REGULATOR EFFICIENCY

vs. LOAD CURRENT

LOAD CURRENT (A)

EFFICIENCY (%)

MAX8728 toc01

0.01 0.1 1 10

EN = GND

EN = VL

NORMALIZED STEP-DOWN REGULATOR

OUTPUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (A)

OUTPUT VOLTAGE (V)

MAX8728 toc02

3.10

3.15

3.20

3.25

3.30

3.35

3.40

0.01 0.1 1 10

EN = GND

EN = VL

STEP-DOWN REGULATOR

LOAD TRANSIENT RESPONSE

MAX8728toc03

LOAD CONTROL, 5V/div

LX1, 20V/div

OUT1, AC, 100mV/div

INDUCTOR CURRENT, 1A/div

4μs/div

STEP-DOWN REGULATOR

SOFT-START (HEAVY LOAD)

MAX8728toc04

, 5V/div

OUT1, 2V/div

INDUCTOR CURRENT, 1A/div

400μs/div

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT (MEASURED AT L1/C3 JUNCTION)

LOAD CURRENT (A)

EFFICIENCY (%)

MAX8728 toc05

100

0.001 0.01 0.1 1 10

NORMALIZED STEP-UP REGULATOR

OUTPUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (A)

OUTPUT VOLTAGE (V)

MAX8728 toc06

13.30

13.35

13.40

13.45

13.50

13.55

13.60

0.01 0.1 1 10

MAX8728

Low-Cost, Multiple-Output

Power Supply for LCD Monitors/TVs

_______________________________________________________________________________________ 9

Typical Operating Characteristics (continued)

(Circuit of Figure 1. VIN= V

INL

= V

SUPP

= 12V, AVDD= 13.5V, V

GON

= 28V, V

GOFF

= -6V, V

OUT1

= 3.3V, FSEL = GND, TA= +25°C,

unless otherwise noted.)

STEP-UP REGULATOR

SOFT-START (HEAVY LOAD)

MAX8728toc07

EN, 2V/div

INDUCTOR CURRENT, 500mA/div

1ms/div

AVDD, 5V/div

GATE, 5V/div

STEP-UP REGULATOR LOAD TRANSIENT

RESPONSE (100mA TO 600mA)

MAX8728toc08

LOAD CONTROL, 5V/div

INDUCTOR CURRENT, 500mA/div

, AC,

200mV/div

10μs/div

STEP-UP REGULATOR PULSED-LOAD

TRANSIENT RESPONSE (100mA TO 1A)

MAX8728toc09

LOAD CONTROL, 5V/div

INDUCTOR CURRENT, 500mA/div

, AC,

100mV/div

4μs/div

TIMER-DELAY

OVERCURRENT PROTECTION

MAX8728toc10

VGON, 20V/div, 10kΩ LOAD

INDUCTOR CURRENT, 1A/div

10ms/div

GOFF

, 5V/div, AVDD, 10kΩ LOAD

OUT1, 2V/div, 2.5A OVERLOAD

AVDD, 5V/div, 150Ω LOAD

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

SWITCHING FREQUENCY (MHz)

MAX8728 toc11

7 8 9 10 11 12 13

1.500

1.505

1.510

1.515

1.520 FSEL = GND

NORMALIZED VL OUTPUT VOLTAGE

vs. VL CURRENT

VL CURRENT (mA)

VL VOLTAGE (V)

MAX8728 toc12

0 10203040506070

4.80

4.85

4.90

4.95

5.00

5.05

EN = GND

EN = VL

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