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General Description

The MAX16822B evaluation kit (EV kit) demonstrates

the MAX16822B hysteretic current-mode high-bright-

ness LED (HBLED) driver IC. The MAX16822B EV kit is

configured as a step-down topology with a constant-

current HBLED driver circuit for external HBLEDs. The

MAX16822B EV kit operates from a DC supply voltage

of 6V to 65V and is configured to deliver up to 350mA

of current to user-supplied HBLEDs. The output voltage

for the HBLED string can go up to 64V and depends

upon the EV kit’s input voltage.

The MAX16822B EV kit can be configured for digital

pulse-width modulation (PWM) dimming operation

using a digital PWM input signal to control the HBLEDs’

brightness. The MAX16822B has an undervoltage lock-

out (UVLO) feature that disables the EV kit at low input

voltage. The EV kit circuit also features a thermal fold-

back and temperature simulation circuit feature. The

MAX16822B EV kit is a fully assembled and tested sur-

face-mount board. The MAX16822B EV kit can also

evaluate the MAX16822A, or for higher currents, a

MAX16832 IC.

Warning: Voltages exceeding 42V may exist on the

LED+ and LED- output pads.

Features

o 6V to 65V Wide Supply Voltage Range

o 333mA LED Current

o Digital PWM Dimming Control

o Analog Dimming Control

o Thermal Foldback and Temperature Simulation

Circuit

o Evaluates MAX16822A (IC Replacement Required)

o Fully Assembled and Tested

Evaluates: MAX16822B/MAX16822A

MAX16822B Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-4211; Rev 0; 7/08

Component List

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.

Ordering Information

DESIGNATION QTY DESCRIPTION

C1 1

1µF ±10%, 100V X7R ceramic

capacitor (1210)

Murata GRM32CR72A105K

C2 1

0.01µF ±10%, 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H103K

C3 0 N ot i nstal l ed , cer am i c cap aci tor ( 1210)

D1 1

100V, 1A Schottky rectifier diode

(SMB)

Central Semiconductor CMSH1-100

(Top Mark: CS100)

JU1, JU2 2 2-pin headers

L1 1

220µH, 0.720A inductor

Coilcraft MSS1038-224KL

DESIGNATION QTY DESCRIPTION

R1 1

0.600Ω ±1%, 0.5W sense resistor

(1206)

IRC LRC-LRF1206LF-01-R600-F

R2 1 100kΩ ±10% potentiometer

R3 1 20kΩ ±5% resistor (0805)

R4 1 100kΩ ±5% resistor (0805)

TP1 1 PC mini red test point

TP2 1 PC mini black test point

U1 1

Step-down HBLED driver (8 SO)

Maxim MAX16822BASA+

— 2 Shunts (JU1, JU2)

— 1 PCB: MAX16822B Evaluation Kit+

PART TYPE

MAX16822BEVKIT+ EV Kit

Denotes lead-free and RoHS compliant.

Summary of content (6 pages)

PAGE 1
9-4211; Rev 0; 7/08 MAX16822B Evaluation Kit The MAX16822B evaluation kit (EV kit) demonstrates the MAX16822B hysteretic current-mode high-brightness LED (HBLED) driver IC. The MAX16822B EV kit is configured as a step-down topology with a constantcurrent HBLED driver circuit for external HBLEDs. The MAX16822B EV kit operates from a DC supply voltage of 6V to 65V and is configured to deliver up to 350mA of current to user-supplied HBLEDs.
PAGE 2
Evaluates: MAX16822B/MAX16822A MAX16822B Evaluation Kit Component Suppliers SUPPLIER PHONE Central Semiconductor Corp. WEBSITE 631-435-1110 www.centralsemi.com Coilcraft, Inc. 847-639-6400 www.coilcraft.com IRC, Inc. 361-992-7900 www.irctt.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX16822B when contacting these component suppliers.
PAGE 3
MAX16822B Evaluation Kit Table 1. Enable and HBLED Dimming (Jumper JU1) SHUNT POSITION DIM PIN EV KIT ENABLE OR DIMMING OPERATION Not installed Connected to VIN through resistor R4 Enabled or analog dimming* (see Table 2) Not installed Connected to PWM signal Enabled, PWM signal applied at DIM PCB pad Installed Connected to PGND Disabled *Analog dimming is achieved by placing a resistor (RDIM) across the TEMP_I and PGND PCB pads.
PAGE 4
Evaluates: MAX16822B/MAX16822A MAX16822B Evaluation Kit Figure 1.
PAGE 5
MAX16822B Evaluation Kit Evaluates: MAX16822B/MAX16822A Figure 2. MAX16822B EV Kit Component Placement Guide— Components Side Figure 3.
PAGE 6
Evaluates: MAX16822B/MAX16822A MAX16822B Evaluation Kit Figure 4. MAX16822B EV Kit PCB 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.