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19-3622; Rev 0; 3/05
MAX8586 Evaluation Kit
General Description
The MAX8586 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board demonstrating the MAX8586 1.2A USB switch. The EV kit operates from a 2.7V to 5.5V input power supply and is capable of sourcing up to 1.2A. The MAX8586 features an adjustable current limit and autorestart for overload and short-circuit protection. A 20ms fault-blanking time prevents erroneous faults caused by load transients and capacitive loads. The MAX8586 is assembled in the space-saving 8-lead 3mm x 3mm TDFN package. Reverse-Current Blocking Programmable Current Limit Autorestart When Fault Is Removed 14% Accurate Current Limit Up to 1.2A Load Current Thermal Overload Protection Built-In 20ms Fault-Blanking Compliant to All USB Specifications 2.7V to 5.5V Input Supply Range FAULT Indicator Output Active-High/Active-Low Select Pin UL Listing Pending Fully Assembled and Tested
Features
Tiny 8-Lead 3mm x 3mm TDFN Package
Evaluates: MAX8586
Component List
DESIGNATION QTY DESCRIPTION 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K or equivalent 3-pin headers 100k 5% resistor (0603) 26.1k 1% resistor (0603) MAX8586ETA Shunts MAX8586 EV kit PC board
C1, C2
2
JU1, JU2, JU3 R1 R2 U1 None None
3 1 1 1 3 1
Ordering Information
PART MAX8586EVKIT TEMP RANGE 0C to +70C IC PACKAGE 8 TDFN 3mm x 3mm
Component Suppliers
SUPPLIER Taiyo Yuden TDK Vishay COMPONENT Capacitors Capacitors Resistors PHONE 408-573-4150 888-835-6646 402-563-6866 WEBSITE www.t-yuden.com www.component.tdk.com www.vishay.com
Note: Indicate that you are using the MAX8586 EV kit when contacting these component suppliers.
Quick Start
Recommended Equipment
* * * 0 to 6V, 1.5A variable power supply 1 digital multimeter (DMM) Dummy load capable of sinking 1.2A
Procedure
The MAX8586 EV kit is fully assembled and tested. Follow these steps to verify board operation: 1) Preset the power supply to 2.7V and turn off. Do not turn the power supply on until all connections are made.
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MAX8586 Evaluation Kit Evaluates: MAX8586
2) Verify on the MAX8586 EV kit that there is a shunt across pins 1 and 2 of JU1 and JU2 to enable the device. 3) Connect the positive lead of the power supply to the VIN pad on the EV kit and the negative lead of the power supply to the GND pad on the EV kit. 4) Connect the positive lead of the DMM to the VOUT pad on the EV kit and the negative lead of the DMM to the GND pad on the EV kit to measure the output voltage. 5) Turn on the power supply and sweep the input voltage from 2.7V to 5.5V. 6) Verify that the output voltage tracks the voltage at VIN over the entire input range. 7) Set the power supply to 5V. 8) Connect the 1.2A load between the VOUT and GND pads on the EV kit. 9) Verify that the output voltage is approximately 5V. The FAULT output goes high impedance after a 20ms delay once the fault condition is removed. Refer to the MAX8586 data sheet for more details on fault protection and fault blanking.
Shutdown (SEL, ON)
SEL sets the active polarity of the logic input, ON. JU1 is provided to select the connection to SEL. Place a jumper between pins 1 and 2 of JU1 to connect SEL to VIN and make ON an active-high input. Place a jumper between pins 2 and 3 of JU1 to connect SEL to GND and make ON an active-low input. See Table 1. JU2 is provided for ON control. Connect a shunt across pins 1 and 2 of JU2 to connect ON to VIN. Connect a shunt across pins 2 and 3 of JU2 to connect ON to GND. The output of a disabled switch enters a highimpedance state.
Setting the Current Limit
The current limit for the MAX8586 is user programmable using the ISET input. Connect a resistor from ISET to GND (R2) to set the current limit. The value for R2 is calculated as: ILIMIT = 1.4A x 26k / R2 R2 must be between 26k and 60k.
Detailed Description
FAULT
The MAX8586 provides an open-drain fault output (FAULT) to indicate that a fault has occurred. In the MAX8586 EV kit, the FAULT output is connected to VIN through a 100k pullup resistor. FAULT asserts low when any of the following conditions occur: * * * The input voltage is below the UVLO threshold. The switch junction temperature exceeds the +160C thermal-shutdown temperature limit. The switch is in current-limit or short-circuit currentlimit mode after the fault-blanking period (20ms) expires. A reverse-current condition exists after the faultblanking period expires.
Autorestart (ENRESET)
The MAX8586 features an autorestart function that tests an overloaded output with a 25mA current to determine when the overload or short circuit has been released. JU3 is available to enable or disable the autorestart function (see Table 2). Place a shunt between positions 1 and 2 of JU3 to enable autorestart. Place a shunt between positions 2 and 3 of JU3 to disable autorestart. Refer to the MAX8586 data sheet for more details on the autorestart function.
*
Jumper Settings
Table 1. Jumper JU1 and JU2 Functions (ON/OFF Control)
JU1 SHUNT LOCATION JU2 SHUNT LOCATION 1 and 2 2 and 3 1 and 2 2 and 3 1 and 2 1 and 2 2 and 3 2 and 3 SEL Connected to VIN Connect to GND Connected to VIN Connect to GND ON Connected to VIN Connected to VIN Connect to GND Connect to GND USB SWITCH STATE On Off Off On
Table 2. Jumper JU3 Function (Autorestart Control)
JU3 SHUNT LOCATION 1 and 2 2 and 3 ENRESET Connected to VIN Connected to GND AUTORESTART Enabled Disabled
2
_______________________________________________________________________________________
MAX8586 Evaluation Kit Evaluates: MAX8586
VIN VIN C1 1F VOUT C2 1F
4
IN
OUT
5
R1 100k FAULT
GND
6
FAULT U1 VIN 1 82 3
SEL
JU1
1 2 3 1 2 3
MAX8586
1 SEL ENRESET
JU3
ENRESET
ON
JU2
3
ON GND 7
ISET
2 R2 26.1k
Figure 1. MAX8586 EV Kit Schematic
Figure 2. MAX8586 EV Kit Component Placement Guide--Top Silkscreen
Figure 3. MAX8586 EV Kit PC Board Layout--Component Side
Figure 4. MAX8586 EV Kit PC Board Layout--Solder Side
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 3 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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