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General Description

The MAX1564 triple, current-limited USB switch comes

in a space-saving, 16-pin, 4mm x 4mm thin QFN pack-

age. Each channel meets all IEC specifications for USB

ports. The device is capable of supplying up to 1.2A

from each output. The MAX1564 has multiple protection

features, including thermal shutdown to limit junction

temperature in case of a prolonged short or overload

condition. Reverse-current protection circuitry blocks

current flow from output to input regardless of the

switch state. The IC has accurate, user-programmable

current-limiting circuitry to protect the input supply

against overload.

Each output of the MAX1564 has short-circuit protec-

tion that latches off the switch when the output is short-

ed for more than 20ms, thereby saving system power.

Auto-restart then tests the shorted output with a 25mA

current to determine when the short is removed, then

automatically restarts the output. Independent open-

drain fault signals notify the microprocessor that the

internal current limit has been reached. A 20ms fault-

blanking feature allows momentary faults to be ignored,

such as those caused when hot-swapping into a

capacitive load. This feature helps avoid issuing false

alarms to the host system. Blanking also suppresses

errant fault signals when the device is powering up.

Applications

USB Ports

USB Hubs

Notebook Computers

Desktop Computers

Docking Stations

Features

♦ Tiny 16-Pin 4mm x 4mm Thin QFN Package

♦ Reverse-Current Blocking

♦ Programmable Current Limit

♦ Auto-Restart when Fault Is Removed

♦ 12% Accurate Current Limit

♦ Up to 1.2A Load Current for Each Output

♦ Thermal-Overload Protection

♦ Built-In 20ms Fault Blanking

♦ Compliant with All USB Specifications

♦ 2.7V to 5.5V Input Supply Range

♦ Independent Fault Indicator Outputs

♦ Active-High/Active-Low Select Pin

♦ ±15kV ESD Protection (with Caps)

MAX1564

Triple 1.2A USB Switch in 4mm x 4mm

Thin QFN

________________________________________________________________

Maxim Integrated Products

12 4

9101112

ONC

TOP VIEW

ONB

ONA

INA

INB

INC

OUTA

GND

OUTB

OUTC

THIN QFN

4mm X 4mm

FLTC

FLTB

SEL

SETI

MAX1564

FLTA

Pin Configuration

Ordering Information

19-3463; Rev 1; 2/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX1564ETE -40°C to +85°C

16 Thin QFN-EP*

4mm x 4mm

EP = Exposed pad.

Summary of content (11 pages)

PAGE 1
9-3463; Rev 1; 2/10 KIT ATION EVALU E L B AVAILA Triple 1.2A USB Switch in 4mm x 4mm Thin QFN Features The MAX1564 triple, current-limited USB switch comes in a space-saving, 16-pin, 4mm x 4mm thin QFN package. Each channel meets all IEC specifications for USB ports. The device is capable of supplying up to 1.2A from each output. The MAX1564 has multiple protection features, including thermal shutdown to limit junction temperature in case of a prolonged short or overload condition.
PAGE 2
MAX1564 Triple 1.2A USB Switch in 4mm x 4mm Thin QFN ABSOLUTE MAXIMUM RATINGS IN_, ON_, OUT_, SEL, VCC to GND (Note 1)............-0.3V to +6V FLT_, SETI to GND .....................................-0.3V to (VCC + 0.3V) IN_ to OUT_ (when disabled, Note 2) .........................-6V to +6V IN_ to OUT_ (when enabled, Note 3)....................-1.5A to +2.3A FLT_ Sink Current................................................................
PAGE 3
Triple 1.2A USB Switch in 4mm x 4mm Thin QFN (VIN_= VCC = VSEL = VON_= 5V, RSETI = 26.1kΩ, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 4) PARAMETER MIN TYP MAX UNITS From current-limit condition to FLT_ low 10 20 40 ms Turn-On Delay ROUT _= 10Ω, COUT_= 1µF, measured from ON_ high to 10% of VOUT_ 0.5 1.5 4.0 ms Output Rise Time ROUT_= 10Ω, COUT_= 1µF, measured from 10% to 90% of VOUT_ 3.
PAGE 4
Typical Operating Characteristics (Circuit of Figure 1, VINA = VINB = VINC = VSEL = VONA = VONB = VONC = 5V, TA = +25°C, unless otherwise noted.) 1.0 0.8 0.6 50 40 30 0.4 20 0.2 10 46 56 1 2 3 4 5 -40 6 -15 10 35 60 RSETI (kΩ) INPUT VOLTAGE (V) TEMPERATURE (°C) STANDBY CURRENT vs. TEMPERATURE SWITCH OFF LEAKAGE CURRENT vs. TEMPERATURE REVERSE BLOCK LEAKAGE CURRENT vs. OUTPUT VOLTAGE 1 LEAKAGE CURRENT (µA) 3.0 2.5 2.0 1.5 1.0 LEAKAGE CURRENT (µA) 0.1 0.01 1 0.
PAGE 5
Triple 1.2A USB Switch in 4mm x 4mm Thin QFN (Circuit of Figure 1, VINA = VINB = VINC = VSEL = VONA = VONB = VONC = 5V, TA = +25°C, unless otherwise noted.) 3.0 2.8 2.6 2.4 RLOAD = 5Ω 2.2 225 VIN = 5.5V 22 VIN = 5.5V VIN = 5V VFLT_ (mV) 3.2 VIN = 4.5V 23 21 35 60 RPULLUP = 5kΩ 75 -40 85 -15 10 35 60 VIN = 5.5V 25 VIN = 4.5V 15 10 10 35 60 85 AUTO-RESTART CURRENT vs.
PAGE 6
MAX1564 Triple 1.2A USB Switch in 4mm x 4mm Thin QFN Typical Operating Characteristics (continued) (Circuit of Figure 1, VINA = VINB = VINC = VSEL = VONA = VONB = VONC = 5V, TA = +25°C, unless otherwise noted.) SHORT-CIRCUIT RESPONSE INTO 0Ω OVERLOAD RESPONSE INTO 2.
PAGE 7
Triple 1.2A USB Switch in 4mm x 4mm Thin QFN PIN NAME FUNCTION 1 INA Input Power Supply for OUTA. Provides power to OUTA. INA, INB, INC, and VCC must be connected together externally. Bypass with a 0.1µF capacitor to GND. Additional capacitors can be used as required. 2 VCC Input Power Supply for the MAX1564. Provides power to the IC. INA, INB, INC, and VCC must be connected together externally. 3 INB Input Power Supply for OUTB. Provides power to OUTB.
PAGE 8
MAX1564 Triple 1.2A USB Switch in 4mm x 4mm Thin QFN current limiting. When VOUT_ is greater than 1V, the device operates in continuous current-limit mode and limits output current to a user-programmable level. When VOUT_ is less than 1V, the device operates in short-circuit current-limit mode and pulses the output current to levels that are 30% (typ) higher than the selected current limit. When either fault condition persists for 20ms (typ), the output turns off and its fault flag is asserted.
PAGE 9
Triple 1.2A USB Switch in 4mm x 4mm Thin QFN Applications Information Setting the Current Limit The current limit for the MAX1564 is user programmable using the SETI input. Connect a resistor from SETI to GND (R1) to set the current limit. The value for R1 is calculated as: ILIMIT = 1.37A x 26.1kΩ / R1 R1 must be between 26kΩ and 60kΩ. Input Capacitor To limit the input voltage drop during momentary output load transients, connect a capacitor from IN_ to ground. A 0.
PAGE 10
MAX1564 Triple 1.2A USB Switch in 4mm x 4mm Thin QFN If the output current exceeds the current-limit threshold, or the output voltage is pulled below the short-circuit detect threshold, the MAX1564 enters a fault state after 20ms, at which point auto-restart mode is enabled and 25mA is sourced by the output. For a 5V input, OUT_ short circuited to GND, and auto-restart mode active, the power dissipation is as follows: Chip Information PROCESS: BiCMOS Package Information P = 0.025A x 5V = 0.
PAGE 11
Triple 1.2A USB Switch in 4mm x 4mm Thin QFN PAGES CHANGED REVISION NUMBER REVISION DATE 0 4/01 Initial release — 1 2/10 Removed UL Certification Pending bullet from Features section 1 DESCRIPTION Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.