USB Charger Detectors

Compliant with USB Battery Charger Specification Revision 1.2 (USB BC 1.2)

Description

The MAX14576/MAX14636/MAX14637 are USB charger detectors. The MAX14576/MAX14636/MAX14637 will pass USB Battery Charger Specification Revision 1.2 (USB BC 1.2) compliance tests. The MAX14636/MAX14637 can also detect Apple chargers, and other nonstandard types. These devices are capable of detecting multiple USB battery charging methods including standard downstream ports (SDP), charging downstream ports (CDP), and dedicated charger ports (DCP). The devices also feature USB BC 1.2 defined dead-battery option support.

The MAX14576/MAX14636/MAX14637 feature analog switches that are capable of passing USB Hi-Speed, full-speed, and low-speed signals. The switches have low on-resistance (3Ω, typ) and low on-capacitance (4.5pF, typ). The CDN and CDP are high ESD protected up to ±15kV Human Body Model (HBM), ±15kV IEC61000-4-2 Air Gap Discharge, and ±8kV IEC61000-4-2 Contact Discharge.

The MAX14576/MAX14636/MAX14637 are available in a 10-pin (1.6mm x 2.1mm) UTQFN package and operate over the -40°C to +85°C extended temperature range

Key Features

High Level of Integration
- Capability to Withstand -6V to +30V (Absolute Maximum) on VBUS Line
- USB Battery Charger Detection
  - Will Pass USB Battery Charger Specification Rev 1.2 Compliance Tests
  - USB DCP, SDP, and CDP Detection
  - Proprietary Charger Detection Capability (MAX14636/MAX14637)
- USB 2.0 Hi-Speed Switch with 3Ω (typ) On-Resistance and 4.5pF (typ) On-Capacitance
- High ESD Protection on CDP and CDN
  - ±15kV—HBM
  - ±15kV—IEC 61000-4-2 Air-Gap Discharge
  - ±8kV—IEC 61000-4-2 Contact Discharge
- ±15kV HBM ESD Protection VBUS When Bypassed with 0.1µF or Greater Ceramic Capacitor
Save Power in Portable Applications
- Low Supply Current (150µA, typ)
Space Saving
- 10-Pin, 1.6mm x 2.1mm, UTQFN Package

MAX16984

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

Industry's First USB Data Protection Switch that Integrates a High-Voltage, Feedback-Adjustable DC-DC Converter

Description

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 Specification BC1.2 battery charging specification and Chinese Telecommunication Industry Standard YD/T 1591-2009. They also include circuitry for iPod^®/iPhone^® 1.0A and 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.

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-programmable 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 low-side 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.

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 associated 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.

Key Features

High-Efficiency DC-DC Controller
- 4.5V to 28V (42V Load Dump) Operating Voltage
- 5V, 2.5A Output Current Capability
- User-Adjustable USB Current Limit
- Fixed-Frequency 220kHz to 2.2MHz Operation
- Forced-PWM Option at No Load
- Spread Spectrum for EMI Reduction
- SYNC Input for Frequency Parking
- Low Q Current Skip Mode and Low Q Shutdown
- Reduced Inrush Current by Soft-Start
Integrated Output Adjustment for Cable Voltage Drop
- User-Adjustable Voltage Gain
- Up to 3 Meter Cable/Up to 600mΩ
USB D+/D- Protection and Host Charger Emulator
- 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
- Chinese Telecommunication Industry Standard YD/T 1591-2009
- High-Speed Pass-Through Mode
- Short to Battery and Short to VBUS Protection
- Compatible with USB On-the-Go Specification
Split Supplies SUP and SUPSW Minimize Power Consumption
Fault Indication Active-Low Open-Drain Output
Automotive Grade ESD Protection (HVD±)
- ±25kV Air/±8kV Contact ISO 10605
- ±15kV Air/±8kV Contact IEC 61000-4-2
- ±15kV Air/±8kV Contact (33Ω, 330pF)
Overtemperature and Short-Circuit Protection
5mm × 5mm, 28-Pin TQFN and Side-Wettable QFND Packages
-40°C to +125°C Operating Temperature Range