MAX16984 datasheet(4/7 Pages) MAXIM

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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.

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.

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 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.

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.

Power-Up and Enabling

System Enable (IN)

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

data switches if IN is above VIN_OVLO. Bypass IN with a

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.

Functional Diagram

MAX16984

FAULT

CD1

CD0

D-

D+

SUPSW

SENSO

FBMAX

FBPER

REF

I LIMIT

BIAS

SUP

I/O

CONTROL AND

DIAGNOSTICS

HVD-

HVD+

GND

BST

PGND

SYNC

FOSC

SENSP

SENSN

FBCAP

2.1A

FPWM

DC-DC

FEEDBACK

ADJUSTMENT

FEEDBACK

CURRENT-

SENSE AMP

BIAS

USB AUTO DCP, CDP,

iPhone, iPad

CHARGER DETECTION

ENBUCK

MAX16984

Automotive High-Current Step-Down Converter with

USB Protection/Host Charger Adapter Emulator

www.maximintegrated.com

Maxim Integrated │ 4

ABRIDGED DATA SHEET

MAX16984 Datasheet(PDF) 4 Page - Maxim Integrated Products

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