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19-2984; Rev 0; 9/03
MAX1553 Evaluation Kit
General Description
The MAX1553 evaluation kit (EV kit) is a fully assembled and tested circuit board with two complete circuits for evaluating the MAX1553 and MAX1554 white LED step-up converters. The MAX1553 circuit operates from 2.7V to 5.5V and delivers an adjustable 0 to 20mA to drive up to six white LEDs connected in series. The MAX1554 circuit operates from 3.15V to 5.5V and delivers an adjustable 0 to 20mA for driving up to 10 white LEDs in series.
Features
o Constant Current Regulation for Even LED Illumination o Up to 88% Efficiency Driving Six LEDs o Analog or PWM Dimming Control of LED Intensity o Small, Low-Profile Components o 2.7V to 5.5V Input Range o Tiny TDFN 3mm x 3mm IC Package o Fully Assembled and Tested
Evaluates: MAX1553/MAX1554
Ordering Information
PART MAX1553EVKIT TEMP RANGE 0C to +70C IC PACKAGE 8 TDFN 3mm x 3mm
Component List
MAX1553 Circuit
DESIGNATION QTY DESCRIPTION 4.7F 10%, 6.3V X5R capacitor (0603) Panasonic ECJ1VB0J475K or equivalent 0.47F 20%, 50V X7R capacitors (1206) TDK C3216X7R1H474M or equivalent 0.1F 10%, 50V X7R capacitors (0603) TDK C1608X7R1H104KT or equivalent Not installed 10F 20%, 6.3V X5R capacitor (0805) Panasonic ECJ2FB0J106M or Taiyo Yuden JMK212BJ106MG 4700pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H472K or equivalent 3300pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H332K or equivalent L2 R1, R6 R2 R3, R4 R5 U1 U2 None None C9 1 1 2 1 2 1 1 1 4 1 DESIGNATION D1 D2-D17 D18 JU1, JU9 JU2, JU8 JU3 JU4-JU7 L1 QTY 1 16 1 2 2 0 0 1 DESCRIPTION 30V Schottky diode (SOD-123) Toshiba CRS02 White LEDs Nichia NSCW215T 60V, 1A Schottky diode (SMA) Central CMSH1-60M 2-pin headers 3-pin headers Not installed, PC board open Not installed, PC board short 33H inductor TOKO A920CY-330M (D62CB) 15H inductor TOKO A920CY-150M (D62CB) 10.0 1% resistors (0603) 200k 5% resistor (0603) 10k 5% resistors (0603) 330k 5% resistor (0603) MAX1553ETA (8-pin TDFN) MAX1554ETA (8-pin TDFN) Shunts, 2-position MAX1553EVKIT PC board
C1
1
C2, C7
2
C3, C6
2
C4, C5
0
C8
1
C10
1
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1553 Evaluation Kit Evaluates: MAX1553/MAX1554
Component Suppliers
SUPPLIER Central Semiconductor Kamaya Murata Nichia Panasonic Sumida Taiyo Yuden TDK TOKO PHONE 631-435-1110 260-489-1533 814-237-1431 248-352-6575 714-373-7939 847-956-0666 408-573-4150 847-803-6100 847-297-0070 WEBSITE www.centralsemi.com www.kamaya.com www.murata.com www.nichia.com www.panasonic.com www.sumida.com www.t-yuden.com www.component.tdk.com www.toko.com
6) Connect the power-supply ground terminal to the pad on the EV kit labeled GND2. 7) Turn on the power supply and verify that the LEDs are lit.
Detailed Description
Evaluating the MAX1553
Shutdown To place the part in low-power shutdown mode, short pins 1 and 2 of JU2. For normal operation, short pins 2 and 3 of JU2. Controlling LED Intensity LED intensity can be controlled using the BRT1 input. BRT1 can be used either as an analog or digital input. When using BRT1, remove the shunt from JU1. Connect a 0 to 1.72V voltage source to BRT1, where 0V corresponds to the dimmest setting and 1.72V is full brightness. Ground the voltage source to AGND1. A digital PWM signal (100Hz to 10kHz) can also be connected directly to BRT1. In this case, 0% duty cycle corresponds to the dimmest setting and 100% corresponds to the brightest. Changing the Number of LEDs The MAX1553 can be used to drive two to six LEDs, and the MAX1553 EV kit comes configured for driving six LEDs. To evaluate the MAX1553 driving fewer than six LEDs, short the pads of the unused LEDs. For convenience, JU3 can be used to short LEDs D2 and D3 for four LED operation. Connecting External LEDs to the EV Kit Surface-mount white LEDs come installed on the EV kit, but it can also be connected to an external LED string. To connect external LEDs, cut the trace shorting JU4. Then, connect the anode of the series string to OUT1+ and connect the cathode of the series string to OUT1-. Using Separate Supplies to Power the IC and Boost In some applications, the MAX1553 IC and the boost inductor are powered from different supplies. For example, the IC can be powered with a 3.3V logic supply and the boost inductor can be connected to a battery. This is useful if the battery voltage is lower than the operating range of the MAX1553. To use different supplies for the IC and boost, cut the trace shorting JU5 on the solder side of the EV kit, then install a 0.1F ceramic capacitor in C4. Connect a 2.7V to 5.5V power supply to VCC1 to power the IC. Connect another power supply to IN1 (the voltage range is not limited to the IC supply range). Ground both power supplies at GND1.
Note: Please indicate that you are using the MAX1553/MAX1554 when contacting these component suppliers.
Recommended Equipment
Power supply capable of providing 2.7V to 5.5V at up to 1A.
Quick Start
MAX1553 Circuit
Follow the steps below to verify operation of the MAX1553 circuit. Do not turn on the power supply until all connections are completed: 1) Verify that the pins of JU1 are shorted. 2) Verify that the pins of JU2 are shorted across pins 2-3. 3) Preset the power supply to between 2.7V and 5.5V. 4) Turn off the power supply. 5) Connect positive power-supply terminal to the pad on the EV kit labeled IN1. 6) Connect power-supply ground terminal to the pad on the EV kit labeled GND1. 7) Turn on the power supply and verify that the LEDs are lit.
MAX1554 Circuit
Follow the steps below to verify operation of the MAX1554 circuit. Do not turn on the power supply until all connections are completed: 1) Verify that the pins of JU9 are shorted. 2) Verify that the pins of JU8 are shorted across pins 2-3. 3) Preset the power supply to between 3.15V and 5.5V. 4) Turn off the power supply. 5) Connect the positive power-supply terminal to the pad on the EV kit labeled IN2.
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MAX1553 Evaluation Kit
Evaluating the MAX1554
Shutdown To place the part in low-power shutdown mode, short pins 1 and 2 of JU8. For normal operation, short pins 2 and 3 of JU8. Controlling LED Intensity LED intensity can be controlled using the BRT2 input. BRT2 can be used either as an analog or digital input. When using BRT2, remove the shunt from JU9. Connect a 0 to 1.72V voltage source to BRT2, where 0V corresponds to the dimmest setting and 1.72V is full brightness. Ground the voltage source to AGND2. A digital PWM signal (100Hz to 10kHz) can also be connected directly to BRT2. In this case, 0% duty cycle corresponds to the dimmest setting and 100% corresponds to the brightest. Changing the Number of LEDs The MAX1554 can be used to drive up to 10 LEDs. If fewer than 10 LEDs are used, short the pads of the unused LEDs. Connecting External LEDs to the EV Kit To connect external LEDs, cut the trace shorting JU7, then connect the anode of the series string to OUT2+ and connect the cathode of the series string to OUT2-. Using Separate Supplies to Power the IC and Boost To use different supplies for the IC and boost, cut the trace shorting JU6 on the solder side of the EV kit; then, install a 0.1F ceramic capacitor in C5. Connect a 2.7V to 5.5V power supply to VCC2 to power the IC. Connect another power supply to IN2 (voltage range is not limited to the IC supply range). Ground both power supplies at GND2.
Evaluates: MAX1553/MAX1554
Table 1. MAX1553 Circuit Jumper Functions
JUMPER JU1 JU2 JU3 JU4 JU5 FUNCTION Connects VCC to BRT when no separate BRT control signal is used. EN Control. Jumper pin 1 to pin 2 for shutdown. Jumper pin 2 to pin 3 for enable. Bypasses two of the six LEDs for four LED testing. Connects on-board LEDs. Cut the PC board trace to power other LEDs. The PC board trace connects VCC to IN for single-supply operation. Cut the trace to separately power VCC and IN. DEFAULT SETTING Shorted. Jumper 2 to 3. Enabled. Open. Six LED operation. Shorted for on-board LEDs. Shorted for single-supply operation.
Table 2. MAX1554 Circuit Jumper Functions
JUMPER JU6 JU7 JU8 JU9 FUNCTION PC board trace connects VCC to IN for single-supply operation. Cut the trace to separately power VCC and IN. Connects on-board LEDs. Cut the PC board trace to power other LEDs. EN Control. Jumper pin 1 to pin 2 for shutdown. Jumper pin 2 to pin 3 for enable. Connects VCC to BRT when no separate BRT control signal is used. DEFAULT SETTING Shorted for single-supply operation. Shorted for on-board LEDs. Jumper 2 to 3. Enabled. Shorted.
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MAX1553 Evaluation Kit Evaluates: MAX1553/MAX1554
D3 OUT1+ D2 JU3 OPEN
D4
IN1 C1 4.7F 2 JU1 BRT1 C4 4 VCC
L1 33H
VCC VCC1
JU5 SHORT
D5 LX 8 D1 C2 0.47F D6 R3 10k C9 4700pF
R2 200k BRT U1 OV 7
AGND1 VCC GND1 3 2 1 C3 0.1F
MAX1553
6 SS GND 1
D7 3 EN EP FB 5 OUT1R1 10 JU4 SHORT
JU2
D11 D10 D9 D13 D8 VCC2 VCC2 JU6 SHORT C8 10F 2 JU9 BRT2 C5 4 7 C10 3300pF D16 VCC LX 8 D18 C7 0.47F D15 D14 D12
IN2
L2 15H
OUT2+
R5 330k BRT U2 OV
AGND2 VCC2 GND2 3 2 1 C6 0.1F
MAX1554
6 SS GND 1
R4 10k
JU8
3
EN
EP
FB
5 OUT2R6 10
D17 JU7 SHORT
Figure 1. MAX1553 EV Kit Schematic 4 _______________________________________________________________________________________
MAX1553 Evaluation Kit Evaluates: MAX1553/MAX1554
Figure 2. MAX1553 EV Kit Component Placement--Component Side
Figure 3. MAX1553 EV Kit Component Placement--Solder Side
Figure 4. MAX1553 EV Kit PC Board Layout--Component Side
Figure 5. MAX1553 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 _____________________ 5 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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