MAX20078AUE [MAXIM]

Synchronous Buck, High-Brightness LED Controller;


型号：	MAX20078AUE
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Synchronous Buck, High-Brightness LED Controller
文件：	总2页 (文件大小：290K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ABRIDGED DATA SHEET

EVALUATION KIT AVAILABLE

MAX20078

Synchronous Buck,

High-Brightness LED Controller

General Description

Beneﬁts and Features

The MAX20078 is a high-voltage, synchronous n-channel

MOSFET controller for high-current buck LED drivers. The

device uses a proprietary average current-mode-control

scheme to regulate the inductor current. This control

method does not need any control-loop compensation

while maintaining nearly constant switching frequency.

Inductor current sense is achieved by sensing the

current in the bottom synchronous n-channel MOSFET. It

does not require any current sense at high voltages. The

device operates over a wide 4.5V to 65V input range. The

device is designed for high-frequency operation and can

operate at switching frequencies as high as 1MHz. The

high- and low-side gate drivers have peak source and sink

current capability of 2A. The driver block also includes

a logic circuit that provides an adaptive nonoverlap time

to prevent shoot-through currents during transition. The

device includes both analog and PWM dimming. The

● Automotive Ready: AEC-Q100 Qualified

● Wide Input Voltage Range: 4.5V to 65V

● Easy to Design

• No Compensation Components

• Programmable Switching Frequency

● Wide Dimming Ratio Allows High Contrast Ratio

• Analog Dimming

• PWM Dimming

● Suitable for Matrix Lighting

• Maintains Current Regulation While Shorting/

Opening Individual LEDs in the String

• Ultrafast-Response Control Loop Prevents

Overshoots and Undershoots

● Fault Detection and Protection

• Overvoltage Protection

• Open and Short Detection

• Low-Power Shutdown Mode

• Thermal Shutdown

device includes a 5V V

regulator capable of delivering

10mA to external circuitry. The device also includes a

current monitor that provides an analog voltage

proportional to the inductor current. The device has

a fault flag that indicates open and shorts across the

output. Protection features include inductor current-limit

protection, overvoltage protection, and thermal shutdown.

The MAX20078 is available in a space-saving (3mm x

3mm), 16-pin TQFN or a 16-pin TSSOP package and is

specified to operate over the -40°C to +125°C automotive

temperature range.

• Inductor Current Monitor

Applications

● Automotive Front Lights

● Automotive Matrix Lights

● Head-Up Displays

● Constant-Current Regulators

Ordering Information appears at end of data sheet.

Simpliﬁed Schematic

INPUT

VCC

BST

MAX20078

TON

OUT

LED1

LEDn

PWM

DIM

LED CURRENT CONTROL

REFI

CSP

FAULT FLAG

FLT

CSN

OUT

CURRENT MONITOR

IOUTV

PGND

AGND

19-8717; Rev 4; 7/18

ABRIDGED DATA SHEET

MAX20078

Synchronous Buck,

High-Brightness LED Controller

Ordering Information

Chip Information

PROCESS: CMOS

TEMP

PART

PIN-PACKAGE

RANGE

-40ºC to

+125ºC

MAX20078ATE+

16 TQFN-EP*

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

-40ºC to

+125ºC

MAX20078ATE/V+

MAX20078ATEY+

MAX20078ATE/VY+

16 TQFN-EP*

-40ºC to

+125ºC

16 TQFN-EP* (SW)

-40ºC to

+125ºC

PACKAGE

TYPE

PACKAGE OUTLINE

LAND

PATTERN NO.

CODE

NO.

-40ºC to

+125ºC

TQFN-EP

T1633+4C

21-0136

90-0031

90-100046

90-0446

MAX20078AUE+

16 TSSOP-EP*

TQFN-EP (SW) T1633Y+4C 21-100108

TSSOP-EP U16E+4C 21-0108

-40ºC to

+125ºC

MAX20078AUE/V+

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

/V denotes an automotive qualified part.

(SW) = Side wettable.

*EP = Exposed pad.

Maxim Integrated

│ 20

www.maximintegrated.com

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