MAX16984RATIV [MAXIM]

Automotive High-Current Step-Down Converter with USB Protection/Host Charger Adapter Emulator;


型号：	MAX16984RATIV
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Automotive High-Current Step-Down Converter with USB Protection/Host Charger Adapter Emulator
文件：	总7页 (文件大小：396K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ABRIDGED DATA SHEET

EVALUATION KIT AVAILABLE

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

General Description

Beneﬁts and Features

● Integrated DC-DC and USB Host Charge Emulator

Enables 1-Chip Solution Directly from Car Battery to

Portable Device

The MAX16984 combines a 5V automotive-grade step-

down converter capable of driving up to 2.5A, a USB host

charger adapter emulator, and USB protection switches

for automotive USB host applications. The USB protection

switches provide high-ESD, short-circuit protection and

feature integrated host-charger port-detection circuitry

adhering to the USB 2.0 Battery Charging Specifica-

tion BC1.2 battery charging specification and Chinese

Telecommunication Industry Standard YD/T 1591-2009.

• 4.5V to 28V (42V Load Dump) Operating Voltage

• 5V, 2.5A Output Current Capability

• Low Q Current Skip Mode and Shutdown Modes

• Soft-Start Reduces Inrush Current

● Low-Noise Features Prevent Interferene with AM

Band and Portable Devices

They also include circuitry for iPod /iPhone 1.0A and

• Fixed-Frequency 220kHz to 2.2MHz Operation

• Forced-PWM Option at No Load

• Spread Spectrum for EMI Reduction

• SYNC Input for Frequency Parking

iPad 2.1A dedicated charging modes. The HVD+ and

HVD- ESD protection features include protection to ±15kV

Air/±8kV Contact on the HVD+ and HVD- outputs to the

IEC 61000-4-2 model and 330Ω, 330pF ESD model.

● Optimal USB Power and Communication for

Portable Devices

The high-efficiency step-down DC-DC converter

operates from a voltage up to 28V and is protected from

load dump transients up to 42V. The device is optimized

for high-frequency operation and includes resistor-pro-

grammable frequency selection from 220kHz to 2.2MHz

to allow optimization of efficiency, noise, and board space

based on application requirements. The converter has

an internal high-side n-channel switch and uses a low

forward-drop freewheeling Schottky diode for rectification.

There is a small lowside n-channel switch to maintain

fixed frequency under light loads. For lower quiescent

current operation requirements, the low side n-channel

switch can be disabled to allow skip mode operation

under light loads. The converter can deliver up to 2.1A

of continuous current at 105°C. The MAX16984S has

an integrated spread-spectrum oscillator to improve EMI

performance.

• User-Adjustable Voltage Gain Adjusts Output Be-

tween 5V and 6.15V for Cable Compensation

• ±3% Accuracy User-Adjustable USB Current Limit

• 4Ω USB 2.0 480Mbps/12Mbps Data Switches

• Integrated iPod/iPhone/iPad Charge-Detection

Termination Resistors

• Supports USB BC1.2 Charging Downstream Port

(CDP) and Dedicated Charging Port (DCP) Modes

• Supports Chinese Telecommunication Industry

Standard YD/T 1591-2009

• High-Speed Pass-Through Mode

● Robust Design Keeps Vehicle System and

Portable Devices Safe in Automotive Environment

• Short-to-Battery Protection on DC-DC Converter

•

Short-to-Battery Protection on USB Pins

• ±25kV Air/±8kV Contact ISO 10605

• ±15kV Air/±8kV Contact IEC 61000-4-2

• ±15kV Air/±8kV Contact (330I, 330pF)

• Fault-Indication Active-Low, Open-Drain Output

• Reduced Inrush Current with Soft-Start

• Overtemperature Protection

• -40NC to +125NC Operating Temperature Range

• 28-Pin, 5mm x 5mm, TQFN and Side-Wettable

QFND Packages

The MAX16984 also includes a USB load current-sense

amplifier and configurable feedback adjustment circuit

designed to provide automatic USB voltage adjustment to

compensate for voltage drops in captive cables associat-

ed with automotive applications. The MAX16984 limits the

USB load current using both a fixed internal peak current

threshold of the DC-DC converter and a user-configurable

external USB load current-sense amplifier threshold.

Applications

● Automotive Radio and Navigation

● USB Port for Host and Hub Applications

● Automotive Connectivity

Ordering Information and Typical Operating Circuit appear

at end of data sheet.

iPod, iPhone, and iPad are registered trademarks of Apple, Inc.

● Telematics

● Dedicated USB Power Charger

19-6627; Rev 6; 5/18

ABRIDGED DATA SHEET

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

Pin Conﬁguration

TOP VIEW

21 20 19 18 17 16 15

BST 22

LX 23

GND

HVD+

12 HVD-

SUPSW

PGND

MAX16984

N.C.

D-

D+

ꢂ

ENBUCK

TꢀFNꢁꢀFND

Pin Description

NAME

FUNCTION

FAULT

Active-Low Open-Drain Fault Indicator Output. Connect a 100kI pullup resistor to IN.

Synchronization Input. The device synchronizes to an external signal applied to SYNC. When

connected to GND or unconnected, skip mode is allowed under light loads. See Table 1. When

connected to a clock source or IN, forced-PWM (FPWM) mode is enabled.

SYNC

Resistor-Programmable Switching-Frequency Setting Control Input. Connect a resistor from FOSC to

GND to set the switching frequency.

FOSC

CD0

CD1

Charger Detection Configuration Bit 0

Charger Detection Configuration Bit 1

I.C.

Internal Connection. Must be connected to external GND.

Digital Input. Used to select voltage feedback adjustment percentage.

FBPER

Logic Enable Input. Connect to I/O voltage of USB transceiver. IN is also used for clamping during

overvoltage events on HVD+ or HVD-. Connect a 1FF ceramic capacitor from IN to GND.

D+

D-

USB Differential Data D+ Input. Connect D+ to low-voltage USB transceiver D+ pin.

USB Differential Data D- Input. Connect D- to low-voltage USB transceiver D- pin.

No Connection

N.C.

High-Voltage-Protected USB Differential Data D- Output. Connect HVD- directly to the USB

connector D- pin.

HVD-

Maxim Integrated

│ 2

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ABRIDGED DATA SHEET

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

Pin Description (continued)

NAME

HVD+

GND

FUNCTION

High-Voltage-Protected USB Differential Data D+ Output. Connect HVD+ directly to the USB

connector D+ pin.

Analog Ground

Current-Sense Amp Output. Connect a resistor and capacitor to GND to set the voltage-adjustment

bandwidth and the USB DC current level at which maximum voltage-feedback adjustment is

reached.

FBMAX

FBCAP

SENSO

SENSN

External Capacitor Connection. Connect a 10pF capacitor to GND.

Current-Sense Amp Output. Connect a resistor and capacitor to GND to set the maximum USB DC

current limit.

Current-Sense Amp Negative Input. Connect to negative terminal of current-sense resistor.

DC-DC Converter Feedback Input and Current-Sense Amp Positive Input. Connect to positive

terminal of current-sense resistor and the main output of the converter. Used for internal voltage

regulation loop.

SENSP

BIAS

5V Linear Regulator Output. Connect a 1FF ceramic capacitor from BIAS to GND. BIAS powers up

the internal circuitry.

Voltage Supply Input. SUP is the supply pin for the internal linear regulator. Connect a minimum of

4.7FF capacitor from SUP to GND close to the IC.

SUP

BST

High-Side Driver Supply. Connect a 0.1FF capacitor from BST to LX.

Inductor Connection. Connect a rectifying Schottky diode between LX and GND. Connect an

inductor from LX to the DC-DC converter output (SENSP).

23, 24

Internal High-Side Switch-Supply Input. SUPSW provides power to the internal switch. Connect a

4.7FF ceramic capacitor in parallel with a 47FF capacitor from SUPSW to PGND. See the DC-DC

Input Capacitor section.

25, 26

SUPSW

PGND

Power Ground

ENBUCK

Battery-Compatible Enable Input. Drive ENBUCK low/high to disable/enable the switching regulator.

Exposed Pad. Connect EP to a large-area contiguous copper ground plane for effective power

dissipation. Do not use as the only IC ground connection. EP must be connected to GND.

—

Maxim Integrated

│ 3

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ABRIDGED DATA SHEET

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

Functional Diagram

Detailed Description

The MAX16984 combines a 5V/2.1A automotive grade

step-down converter, a USB host charger adapter emu-

lator, and USB protection switches. It is designed for

high-power USB ports in automotive radio, navigation,

connectivity, and USB hub applications.

MAX16984

FAULT

CD1

The USB protection switches provide high-ESD and

short-circuit protection for the low-voltage internal data

lines of the multimedia processor’s USB transceiver

and support USB Hi-Speed (480Mbps) and USB Full-

Speed (12Mbps) pass-through operation. The MAX16984

features integrated host-charger port-detection circuitry

adhering to the USB 2.0 Battery Charging Specification

BC1.2 and also includes dedicated bias resistors for iPod/

iPhone 1.0A and iPad 2.1A dedicated charging modes.

I/O

CONTROL AND

DIAGNOSTICS

CD0

HVD-

HVD+

D-

D+

GND

USB AUTO DCP, CDP,

iPhone, iPad

The high-efficiency step-down DC-DC converter operates

from a voltage up to 28V and is protected from load dump

CHARGER DETECTION

SUPSW

transients up to 42V. The device includes resistor-pro-

grammable frequency selection from 220kHz to 2.2MHz

to allow optimization of efficiency, noise, and board space

based on the application requirements. The converter can

deliver up to 2.1A of continuous current at 105NC.

BST

SUP

BIAS

2.1A

The MAX16984 also includes a high-side current-sense

amplifier and configurable feedback adjustment circuit

designed to provide automatic USB voltage adjustment

to compensate for voltage drops in captive cables associ-

ated with automotive applications.

FPWM

DC-DC

PGND

ENBUCK

SYNC

FOSC

REF

Power-Up and Enabling

System Enable (IN)

I LIMIT

IN is used as the main enable to the MAX16984 and is

also used to clamp the D+ and D- pins during an ESD

and short-to-battery on the HVD+ and HVD- pins. This

clamping protects the downstream USB transceiver. The

IN pin contains an overvoltage lockout that disables the

FEEDBACK

SENSP

SENSN

SENSO

FBMAX

data switches if IN is above V

. Bypass IN with a

IN_OVLO

1FF capacitor and connect it to the same 3.3V supply as

shared with the multimedia processor’s USB transceiver.

If IN is logic-high, the protection switches are enabled

and the USB switches operate in one of four modes per

the CD0 and CD1 inputs. If IN is at a logic-low level, SUP

power consumption is reduced and the device enters a

standby low quiescent level.

CURRENT-

SENSE AMP

FBPER

FEEDBACK

ADJUSTMENT

FBCAP

Maxim Integrated

│ 4

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ABRIDGED DATA SHEET

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

Typical Operating Circuit

+3.3V USB

I/O VOLTAGE

1µF

100kΩ

MAX16984

3.3V

FAULT

CD1

OCI

I/O

CONTROL

AND

LOW-

VOLTAGE

µC OR ASIC

WITH

INTEGRATED

USB

CD0

DIAGNOSTICS

6pF

15nH

2.2nH

HVD-

D-

15nH

D+

HVD+

D+

TRANSCEIVER

6pF

USB

EN USB

USB AUTO DCP, CDP,

iPod, iPad

CHARGER DETECTION

GND

BST

HOST

CONNECTOR

VBUS

VBAT

4.7µF

0.1µF

GND

SUPSW

SUP

47µF

0.1µF

BIAS

4.7µF

2.2µH

22µF

50mΩ

BIAS

2.1A

FPWM

DC-DC

1µF

PGND

ENBUCK

SENSO

ENBUCK

SYNC

FOSC

REF

I LIMIT

FEEDBACK

12kΩ

to ADC

SENSP

SENSN

R_SENSO

C_SENSO

CURRENT-

SENSE AMP

FBMAX

FBPER

R_FBMAX

C_FBMAX

FEEDBACK

ADJUSTMENT

FBCAP

10pF

Maxim Integrated

│ 5

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ABRIDGED DATA SHEET

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

Ordering Information

PART

MAX16984RAGI/VY+

MAX16984SAGI/VY+

MAX16984RATI/V+

MAX16984SATI/V+

TEMP RANGE

-40NC to +125NC

SPREAD SPECTRUM

Disabled

PIN-PACKAGE

28 QFND-EP* (SW)

28 TQFN-EP*

Enabled

Disabled

Enabled

28 TQFN-EP*

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

/V denotes an automotive qualified part.

*EP = Exposed pad.

(SW) = Side wettable.

Tape-and-reel versions availability―contact factory for availability.

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns (foot-

prints), 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.

PACKAGE

TYPE

PACKAGE OUTLINE

LAND

PATTERN NO.

CODE

G2855Y+2

T2855+6

NO.

28 QFND-EP

(Side Wettable)

21-0563

21-0140

90-0375

90-0026

28 TQFN-EP

Maxim Integrated

│ 6

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ABRIDGED DATA SHEET

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

Revision History

REVISION REVISION

PAGES

DESCRIPTION

CHANGED

NUMBER

DATE

3/13

Initial release

—

3–6, 11, 12, 17,

19, 20, 22, 27,

28, 31,

Corrected values/figures, updated Electrical Characteristics table specs, and clarified

spread-spectrum information

7/13

12/14

Updated Switching Frequency (FOSC, SYNC) section and Typical Operating Circuit

18, 31

Updated Benefits and Features section, added new Note 1 to Absolute Maximum

Ratings and renumbered remaining notes through end of Electrical Characteristics,

updated pins 15 and 16 in Pin Description table, updated Tuning of USB Data Lines

section and Typical Operating Circuit

4/15

1–6, 16, 27, 31

5/16

9/16

5/18

Removed future product references

Updated Switching Frequency (FOSC, SYNC) section

Added new footnote for tape-and-reel versions under Ordering Information table

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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. Maxim Integrated reserves the right to change the circuitry and speciﬁcations without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

2018 Maxim Integrated Products, Inc.

│ 7

MAX16984RATIV [MAXIM]

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