MAX1823, MAX1823A, MAX1823B, MAX1823H Dual USB Switch with Fault Blanking and Autoreset

QuickView

Technical Documents

Ordering Info

More Information

User Comments (0)

All

Description

FULL DATA SHEET (PDF, 312kB)

Download

E-Mail

The MAX1823 is a dual, current-limited switch with autoreset specifically made for USB applications. The autoreset feature latches the switch off if the output is shorted, saving system power. The switch reactivates when the short circuit is removed. Each channel is guaranteed to supply 720mA and meet USB specifications. Low quiescent supply current (50µA) and standby current (3µA) conserve battery power in portable applications.

The MAX1823 has multiple safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. Accurate internal current-limiting circuitry protects the input supply against both overload and short-circuit conditions. Independent fault signals (active-low FAULTA and active-low FAULTB) notify the microprocessor (µP) when a thermal-overload, current-limit, undervoltage-lockout (UVLO), or short-circuit fault occurs. A 20ms fault-blanking feature ignores momentary faults, such as those caused when hot swapping a capacitive load, preventing false alarms to the host system. The MAX1823A/MAX1823B also block reverse current (current from OUT_ to IN_) while in shutdown.

The MAX1823 is available in a space-saving 10-pin µMAX® package. The MAX1823/MAX1823A are enabled with an active-low signal, and the MAX1823B/MAX1823H are enabled with an active-high signal. For a single version of this device, refer to the MAX1946 data sheet. For a triple version, refer to the MAX1940 data sheet.

Key Features

Applications/Uses

Dual USB Switch in Tiny 10-Pin µMAX Package
Autoreset Feature Saves Power
Guaranteed 720mA Load per Channel
Built-In 20ms Fault Blanking
Compliant to USB Specification
Blocks Reverse Current in Shutdown (MAX1823A/MAX1823B)
4V to 5.5V Input Voltage Range
Independent Shutdown Control
- (MAX1823/MAX1823A—Active Low)
- (MAX1823B/MAX1823H—Active High)
Independent active-low FAULT Indicator Outputs
Thermal-Overload Protection
50µA Quiescent Current (Both Switches On)
3µA Standby Current
UL Recognized

	Docking Stations
	Notebook and Desktop Computers
	PDAs and Palmtop Computers
	USB Ports and Hubs

Key Specifications: USB Power Switches

Part Number

Functions

Number of Switches

Max. Load Current (A)

R_ON (typ) (Ω)

Fault Indicator

Fault Blanking Timeout (ms)

Switch Op. Voltage Range (V)

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX1823

•	Auto Retry

•	Fault Blanking

0.9

0.075

Yes

4.0 to 5.5

Yes

uMAX/10

-40 to +85

$1.03 @ 1k

MAX1823A

•	Auto Retry

•	Fault Blanking

•	Reverse Voltage Blocking

$1.03 @ 1k

MAX1823B

•	Auto Retry

•	Fault Blanking

•	Reverse Voltage Blocking

$1.03 @ 1k

MAX1823H

•	Auto Retry

•	Fault Blanking

$1.03 @ 1k

See All USB Power Switches (28)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.